fixes

vendor/sabberworm/php-css-parser/src/CSSList/AtRuleBlockList.php

@@ -0,0 +1,83 @@
+<?php
+
+namespace Sabberworm\CSS\CSSList;
+
+use Sabberworm\CSS\OutputFormat;
+use Sabberworm\CSS\Property\AtRule;
+
+/**
+ * A `BlockList` constructed by an unknown at-rule. `@media` rules are rendered into `AtRuleBlockList` objects.
+ */
+class AtRuleBlockList extends CSSBlockList implements AtRule
+{
+    /**
+     * @var string
+     */
+    private $sType;
+
+    /**
+     * @var string
+     */
+    private $sArgs;
+
+    /**
+     * @param string $sType
+     * @param string $sArgs
+     * @param int $iLineNo
+     */
+    public function __construct($sType, $sArgs = '', $iLineNo = 0)
+    {
+        parent::__construct($iLineNo);
+        $this->sType = $sType;
+        $this->sArgs = $sArgs;
+    }
+
+    /**
+     * @return string
+     */
+    public function atRuleName()
+    {
+        return $this->sType;
+    }
+
+    /**
+     * @return string
+     */
+    public function atRuleArgs()
+    {
+        return $this->sArgs;
+    }
+
+    /**
+     * @return string
+     */
+    public function __toString()
+    {
+        return $this->render(new OutputFormat());
+    }
+
+    /**
+     * @return string
+     */
+    public function render(OutputFormat $oOutputFormat)
+    {
+        $sArgs = $this->sArgs;
+        if ($sArgs) {
+            $sArgs = ' ' . $sArgs;
+        }
+        $sResult = $oOutputFormat->sBeforeAtRuleBlock;
+        $sResult .= "@{$this->sType}$sArgs{$oOutputFormat->spaceBeforeOpeningBrace()}{";
+        $sResult .= parent::render($oOutputFormat);
+        $sResult .= '}';
+        $sResult .= $oOutputFormat->sAfterAtRuleBlock;
+        return $sResult;
+    }
+
+    /**
+     * @return bool
+     */
+    public function isRootList()
+    {
+        return false;
+    }
+}

vendor/sabberworm/php-css-parser/src/CSSList/CSSBlockList.php

@@ -0,0 +1,143 @@
+<?php
+
+namespace Sabberworm\CSS\CSSList;
+
+use Sabberworm\CSS\Property\Selector;
+use Sabberworm\CSS\Rule\Rule;
+use Sabberworm\CSS\RuleSet\DeclarationBlock;
+use Sabberworm\CSS\RuleSet\RuleSet;
+use Sabberworm\CSS\Value\CSSFunction;
+use Sabberworm\CSS\Value\Value;
+use Sabberworm\CSS\Value\ValueList;
+
+/**
+ * A `CSSBlockList` is a `CSSList` whose `DeclarationBlock`s are guaranteed to contain valid declaration blocks or
+ * at-rules.
+ *
+ * Most `CSSList`s conform to this category but some at-rules (such as `@keyframes`) do not.
+ */
+abstract class CSSBlockList extends CSSList
+{
+    /**
+     * @param int $iLineNo
+     */
+    public function __construct($iLineNo = 0)
+    {
+        parent::__construct($iLineNo);
+    }
+
+    /**
+     * @param array<int, DeclarationBlock> $aResult
+     *
+     * @return void
+     */
+    protected function allDeclarationBlocks(array &$aResult)
+    {
+        foreach ($this->aContents as $mContent) {
+            if ($mContent instanceof DeclarationBlock) {
+                $aResult[] = $mContent;
+            } elseif ($mContent instanceof CSSBlockList) {
+                $mContent->allDeclarationBlocks($aResult);
+            }
+        }
+    }
+
+    /**
+     * @param array<int, RuleSet> $aResult
+     *
+     * @return void
+     */
+    protected function allRuleSets(array &$aResult)
+    {
+        foreach ($this->aContents as $mContent) {
+            if ($mContent instanceof RuleSet) {
+                $aResult[] = $mContent;
+            } elseif ($mContent instanceof CSSBlockList) {
+                $mContent->allRuleSets($aResult);
+            }
+        }
+    }
+
+    /**
+     * @param CSSList|Rule|RuleSet|Value $oElement
+     * @param array<int, Value> $aResult
+     * @param string|null $sSearchString
+     * @param bool $bSearchInFunctionArguments
+     *
+     * @return void
+     */
+    protected function allValues($oElement, array &$aResult, $sSearchString = null, $bSearchInFunctionArguments = false)
+    {
+        if ($oElement instanceof CSSBlockList) {
+            foreach ($oElement->getContents() as $oContent) {
+                $this->allValues($oContent, $aResult, $sSearchString, $bSearchInFunctionArguments);
+            }
+        } elseif ($oElement instanceof RuleSet) {
+            foreach ($oElement->getRules($sSearchString) as $oRule) {
+                $this->allValues($oRule, $aResult, $sSearchString, $bSearchInFunctionArguments);
+            }
+        } elseif ($oElement instanceof Rule) {
+            $this->allValues($oElement->getValue(), $aResult, $sSearchString, $bSearchInFunctionArguments);
+        } elseif ($oElement instanceof ValueList) {
+            if ($bSearchInFunctionArguments || !($oElement instanceof CSSFunction)) {
+                foreach ($oElement->getListComponents() as $mComponent) {
+                    $this->allValues($mComponent, $aResult, $sSearchString, $bSearchInFunctionArguments);
+                }
+            }
+        } else {
+            // Non-List `Value` or `CSSString` (CSS identifier)
+            $aResult[] = $oElement;
+        }
+    }
+
+    /**
+     * @param array<int, Selector> $aResult
+     * @param string|null $sSpecificitySearch
+     *
+     * @return void
+     */
+    protected function allSelectors(array &$aResult, $sSpecificitySearch = null)
+    {
+        /** @var array<int, DeclarationBlock> $aDeclarationBlocks */
+        $aDeclarationBlocks = [];
+        $this->allDeclarationBlocks($aDeclarationBlocks);
+        foreach ($aDeclarationBlocks as $oBlock) {
+            foreach ($oBlock->getSelectors() as $oSelector) {
+                if ($sSpecificitySearch === null) {
+                    $aResult[] = $oSelector;
+                } else {
+                    $sComparator = '===';
+                    $aSpecificitySearch = explode(' ', $sSpecificitySearch);
+                    $iTargetSpecificity = $aSpecificitySearch[0];
+                    if (count($aSpecificitySearch) > 1) {
+                        $sComparator = $aSpecificitySearch[0];
+                        $iTargetSpecificity = $aSpecificitySearch[1];
+                    }
+                    $iTargetSpecificity = (int)$iTargetSpecificity;
+                    $iSelectorSpecificity = $oSelector->getSpecificity();
+                    $bMatches = false;
+                    switch ($sComparator) {
+                        case '<=':
+                            $bMatches = $iSelectorSpecificity <= $iTargetSpecificity;
+                            break;
+                        case '<':
+                            $bMatches = $iSelectorSpecificity < $iTargetSpecificity;
+                            break;
+                        case '>=':
+                            $bMatches = $iSelectorSpecificity >= $iTargetSpecificity;
+                            break;
+                        case '>':
+                            $bMatches = $iSelectorSpecificity > $iTargetSpecificity;
+                            break;
+                        default:
+                            $bMatches = $iSelectorSpecificity === $iTargetSpecificity;
+                            break;
+                    }
+                    if ($bMatches) {
+                        $aResult[] = $oSelector;
+                    }
+                }
+            }
+        }
+    }
+}

vendor/sabberworm/php-css-parser/src/CSSList/CSSList.php

@@ -0,0 +1,479 @@
+<?php
+
+namespace Sabberworm\CSS\CSSList;
+
+use Sabberworm\CSS\Comment\Comment;
+use Sabberworm\CSS\Comment\Commentable;
+use Sabberworm\CSS\OutputFormat;
+use Sabberworm\CSS\Parsing\ParserState;
+use Sabberworm\CSS\Parsing\SourceException;
+use Sabberworm\CSS\Parsing\UnexpectedEOFException;
+use Sabberworm\CSS\Parsing\UnexpectedTokenException;
+use Sabberworm\CSS\Property\AtRule;
+use Sabberworm\CSS\Property\Charset;
+use Sabberworm\CSS\Property\CSSNamespace;
+use Sabberworm\CSS\Property\Import;
+use Sabberworm\CSS\Property\Selector;
+use Sabberworm\CSS\Renderable;
+use Sabberworm\CSS\RuleSet\AtRuleSet;
+use Sabberworm\CSS\RuleSet\DeclarationBlock;
+use Sabberworm\CSS\RuleSet\RuleSet;
+use Sabberworm\CSS\Settings;
+use Sabberworm\CSS\Value\CSSString;
+use Sabberworm\CSS\Value\URL;
+use Sabberworm\CSS\Value\Value;
+
+/**
+ * A `CSSList` is the most generic container available. Its contents include `RuleSet` as well as other `CSSList`
+ * objects.
+ *
+ * Also, it may contain `Import` and `Charset` objects stemming from at-rules.
+ */
+abstract class CSSList implements Renderable, Commentable
+{
+    /**
+     * @var array<array-key, Comment>
+     */
+    protected $aComments;
+
+    /**
+     * @var array<int, RuleSet|CSSList|Import|Charset>
+     */
+    protected $aContents;
+
+    /**
+     * @var int
+     */
+    protected $iLineNo;
+
+    /**
+     * @param int $iLineNo
+     */
+    public function __construct($iLineNo = 0)
+    {
+        $this->aComments = [];
+        $this->aContents = [];
+        $this->iLineNo = $iLineNo;
+    }
+
+    /**
+     * @return void
+     *
+     * @throws UnexpectedTokenException
+     * @throws SourceException
+     */
+    public static function parseList(ParserState $oParserState, CSSList $oList)
+    {
+        $bIsRoot = $oList instanceof Document;
+        if (is_string($oParserState)) {
+            $oParserState = new ParserState($oParserState, Settings::create());
+        }
+        $bLenientParsing = $oParserState->getSettings()->bLenientParsing;
+        while (!$oParserState->isEnd()) {
+            $comments = $oParserState->consumeWhiteSpace();
+            $oListItem = null;
+            if ($bLenientParsing) {
+                try {
+                    $oListItem = self::parseListItem($oParserState, $oList);
+                } catch (UnexpectedTokenException $e) {
+                    $oListItem = false;
+                }
+            } else {
+                $oListItem = self::parseListItem($oParserState, $oList);
+            }
+            if ($oListItem === null) {
+                // List parsing finished
+                return;
+            }
+            if ($oListItem) {
+                $oListItem->setComments($comments);
+                $oList->append($oListItem);
+            }
+            $oParserState->consumeWhiteSpace();
+        }
+        if (!$bIsRoot && !$bLenientParsing) {
+            throw new SourceException("Unexpected end of document", $oParserState->currentLine());
+        }
+    }
+
+    /**
+     * @return AtRuleBlockList|KeyFrame|Charset|CSSNamespace|Import|AtRuleSet|DeclarationBlock|null|false
+     *
+     * @throws SourceException
+     * @throws UnexpectedEOFException
+     * @throws UnexpectedTokenException
+     */
+    private static function parseListItem(ParserState $oParserState, CSSList $oList)
+    {
+        $bIsRoot = $oList instanceof Document;
+        if ($oParserState->comes('@')) {
+            $oAtRule = self::parseAtRule($oParserState);
+            if ($oAtRule instanceof Charset) {
+                if (!$bIsRoot) {
+                    throw new UnexpectedTokenException(
+                        '@charset may only occur in root document',
+                        '',
+                        'custom',
+                        $oParserState->currentLine()
+                    );
+                }
+                if (count($oList->getContents()) > 0) {
+                    throw new UnexpectedTokenException(
+                        '@charset must be the first parseable token in a document',
+                        '',
+                        'custom',
+                        $oParserState->currentLine()
+                    );
+                }
+                $oParserState->setCharset($oAtRule->getCharset()->getString());
+            }
+            return $oAtRule;
+        } elseif ($oParserState->comes('}')) {
+            if (!$oParserState->getSettings()->bLenientParsing) {
+                throw new UnexpectedTokenException('CSS selector', '}', 'identifier', $oParserState->currentLine());
+            } else {
+                if ($bIsRoot) {
+                    if ($oParserState->getSettings()->bLenientParsing) {
+                        return DeclarationBlock::parse($oParserState);
+                    } else {
+                        throw new SourceException("Unopened {", $oParserState->currentLine());
+                    }
+                } else {
+                    return null;
+                }
+            }
+        } else {
+            return DeclarationBlock::parse($oParserState, $oList);
+        }
+    }
+
+    /**
+     * @param ParserState $oParserState
+     *
+     * @return AtRuleBlockList|KeyFrame|Charset|CSSNamespace|Import|AtRuleSet|null
+     *
+     * @throws SourceException
+     * @throws UnexpectedTokenException
+     * @throws UnexpectedEOFException
+     */
+    private static function parseAtRule(ParserState $oParserState)
+    {
+        $oParserState->consume('@');
+        $sIdentifier = $oParserState->parseIdentifier();
+        $iIdentifierLineNum = $oParserState->currentLine();
+        $oParserState->consumeWhiteSpace();
+        if ($sIdentifier === 'import') {
+            $oLocation = URL::parse($oParserState);
+            $oParserState->consumeWhiteSpace();
+            $sMediaQuery = null;
+            if (!$oParserState->comes(';')) {
+                $sMediaQuery = trim($oParserState->consumeUntil([';', ParserState::EOF]));
+            }
+            $oParserState->consumeUntil([';', ParserState::EOF], true, true);
+            return new Import($oLocation, $sMediaQuery ?: null, $iIdentifierLineNum);
+        } elseif ($sIdentifier === 'charset') {
+            $sCharset = CSSString::parse($oParserState);
+            $oParserState->consumeWhiteSpace();
+            $oParserState->consumeUntil([';', ParserState::EOF], true, true);
+            return new Charset($sCharset, $iIdentifierLineNum);
+        } elseif (self::identifierIs($sIdentifier, 'keyframes')) {
+            $oResult = new KeyFrame($iIdentifierLineNum);
+            $oResult->setVendorKeyFrame($sIdentifier);
+            $oResult->setAnimationName(trim($oParserState->consumeUntil('{', false, true)));
+            CSSList::parseList($oParserState, $oResult);
+            if ($oParserState->comes('}')) {
+                $oParserState->consume('}');
+            }
+            return $oResult;
+        } elseif ($sIdentifier === 'namespace') {
+            $sPrefix = null;
+            $mUrl = Value::parsePrimitiveValue($oParserState);
+            if (!$oParserState->comes(';')) {
+                $sPrefix = $mUrl;
+                $mUrl = Value::parsePrimitiveValue($oParserState);
+            }
+            $oParserState->consumeUntil([';', ParserState::EOF], true, true);
+            if ($sPrefix !== null && !is_string($sPrefix)) {
+                throw new UnexpectedTokenException('Wrong namespace prefix', $sPrefix, 'custom', $iIdentifierLineNum);
+            }
+            if (!($mUrl instanceof CSSString || $mUrl instanceof URL)) {
+                throw new UnexpectedTokenException(
+                    'Wrong namespace url of invalid type',
+                    $mUrl,
+                    'custom',
+                    $iIdentifierLineNum
+                );
+            }
+            return new CSSNamespace($mUrl, $sPrefix, $iIdentifierLineNum);
+        } else {
+            // Unknown other at rule (font-face or such)
+            $sArgs = trim($oParserState->consumeUntil('{', false, true));
+            if (substr_count($sArgs, "(") != substr_count($sArgs, ")")) {
+                if ($oParserState->getSettings()->bLenientParsing) {
+                    return null;
+                } else {
+                    throw new SourceException("Unmatched brace count in media query", $oParserState->currentLine());
+                }
+            }
+            $bUseRuleSet = true;
+            foreach (explode('/', AtRule::BLOCK_RULES) as $sBlockRuleName) {
+                if (self::identifierIs($sIdentifier, $sBlockRuleName)) {
+                    $bUseRuleSet = false;
+                    break;
+                }
+            }
+            if ($bUseRuleSet) {
+                $oAtRule = new AtRuleSet($sIdentifier, $sArgs, $iIdentifierLineNum);
+                RuleSet::parseRuleSet($oParserState, $oAtRule);
+            } else {
+                $oAtRule = new AtRuleBlockList($sIdentifier, $sArgs, $iIdentifierLineNum);
+                CSSList::parseList($oParserState, $oAtRule);
+                if ($oParserState->comes('}')) {
+                    $oParserState->consume('}');
+                }
+            }
+            return $oAtRule;
+        }
+    }
+
+    /**
+     * Tests an identifier for a given value. Since identifiers are all keywords, they can be vendor-prefixed.
+     * We need to check for these versions too.
+     *
+     * @param string $sIdentifier
+     * @param string $sMatch
+     *
+     * @return bool
+     */
+    private static function identifierIs($sIdentifier, $sMatch)
+    {
+        return (strcasecmp($sIdentifier, $sMatch) === 0)
+            ?: preg_match("/^(-\\w+-)?$sMatch$/i", $sIdentifier) === 1;
+    }
+
+    /**
+     * @return int
+     */
+    public function getLineNo()
+    {
+        return $this->iLineNo;
+    }
+
+    /**
+     * Prepends an item to the list of contents.
+     *
+     * @param RuleSet|CSSList|Import|Charset $oItem
+     *
+     * @return void
+     */
+    public function prepend($oItem)
+    {
+        array_unshift($this->aContents, $oItem);
+    }
+
+    /**
+     * Appends an item to tje list of contents.
+     *
+     * @param RuleSet|CSSList|Import|Charset $oItem
+     *
+     * @return void
+     */
+    public function append($oItem)
+    {
+        $this->aContents[] = $oItem;
+    }
+
+    /**
+     * Splices the list of contents.
+     *
+     * @param int $iOffset
+     * @param int $iLength
+     * @param array<int, RuleSet|CSSList|Import|Charset> $mReplacement
+     *
+     * @return void
+     */
+    public function splice($iOffset, $iLength = null, $mReplacement = null)
+    {
+        array_splice($this->aContents, $iOffset, $iLength, $mReplacement);
+    }
+
+    /**
+     * Removes an item from the CSS list.
+     *
+     * @param RuleSet|Import|Charset|CSSList $oItemToRemove
+     *        May be a RuleSet (most likely a DeclarationBlock), a Import,
+     *        a Charset or another CSSList (most likely a MediaQuery)
+     *
+     * @return bool whether the item was removed
+     */
+    public function remove($oItemToRemove)
+    {
+        $iKey = array_search($oItemToRemove, $this->aContents, true);
+        if ($iKey !== false) {
+            unset($this->aContents[$iKey]);
+            return true;
+        }
+        return false;
+    }
+
+    /**
+     * Replaces an item from the CSS list.
+     *
+     * @param RuleSet|Import|Charset|CSSList $oOldItem
+     *        May be a `RuleSet` (most likely a `DeclarationBlock`), an `Import`, a `Charset`
+     *        or another `CSSList` (most likely a `MediaQuery`)
+     *
+     * @return bool
+     */
+    public function replace($oOldItem, $mNewItem)
+    {
+        $iKey = array_search($oOldItem, $this->aContents, true);
+        if ($iKey !== false) {
+            if (is_array($mNewItem)) {
+                array_splice($this->aContents, $iKey, 1, $mNewItem);
+            } else {
+                array_splice($this->aContents, $iKey, 1, [$mNewItem]);
+            }
+            return true;
+        }
+        return false;
+    }
+
+    /**
+     * @param array<int, RuleSet|Import|Charset|CSSList> $aContents
+     */
+    public function setContents(array $aContents)
+    {
+        $this->aContents = [];
+        foreach ($aContents as $content) {
+            $this->append($content);
+        }
+    }
+
+    /**
+     * Removes a declaration block from the CSS list if it matches all given selectors.
+     *
+     * @param DeclarationBlock|array<array-key, Selector>|string $mSelector the selectors to match
+     * @param bool $bRemoveAll whether to stop at the first declaration block found or remove all blocks
+     *
+     * @return void
+     */
+    public function removeDeclarationBlockBySelector($mSelector, $bRemoveAll = false)
+    {
+        if ($mSelector instanceof DeclarationBlock) {
+            $mSelector = $mSelector->getSelectors();
+        }
+        if (!is_array($mSelector)) {
+            $mSelector = explode(',', $mSelector);
+        }
+        foreach ($mSelector as $iKey => &$mSel) {
+            if (!($mSel instanceof Selector)) {
+                if (!Selector::isValid($mSel)) {
+                    throw new UnexpectedTokenException(
+                        "Selector did not match '" . Selector::SELECTOR_VALIDATION_RX . "'.",
+                        $mSel,
+                        "custom"
+                    );
+                }
+                $mSel = new Selector($mSel);
+            }
+        }
+        foreach ($this->aContents as $iKey => $mItem) {
+            if (!($mItem instanceof DeclarationBlock)) {
+                continue;
+            }
+            if ($mItem->getSelectors() == $mSelector) {
+                unset($this->aContents[$iKey]);
+                if (!$bRemoveAll) {
+                    return;
+                }
+            }
+        }
+    }
+
+    /**
+     * @return string
+     */
+    public function __toString()
+    {
+        return $this->render(new OutputFormat());
+    }
+
+    /**
+     * @return string
+     */
+    public function render(OutputFormat $oOutputFormat)
+    {
+        $sResult = '';
+        $bIsFirst = true;
+        $oNextLevel = $oOutputFormat;
+        if (!$this->isRootList()) {
+            $oNextLevel = $oOutputFormat->nextLevel();
+        }
+        foreach ($this->aContents as $oContent) {
+            $sRendered = $oOutputFormat->safely(function () use ($oNextLevel, $oContent) {
+                return $oContent->render($oNextLevel);
+            });
+            if ($sRendered === null) {
+                continue;
+            }
+            if ($bIsFirst) {
+                $bIsFirst = false;
+                $sResult .= $oNextLevel->spaceBeforeBlocks();
+            } else {
+                $sResult .= $oNextLevel->spaceBetweenBlocks();
+            }
+            $sResult .= $sRendered;
+        }
+
+        if (!$bIsFirst) {
+            // Had some output
+            $sResult .= $oOutputFormat->spaceAfterBlocks();
+        }
+
+        return $sResult;
+    }
+
+    /**
+     * Return true if the list can not be further outdented. Only important when rendering.
+     *
+     * @return bool
+     */
+    abstract public function isRootList();
+
+    /**
+     * @return array<int, RuleSet|Import|Charset|CSSList>
+     */
+    public function getContents()
+    {
+        return $this->aContents;
+    }
+
+    /**
+     * @param array<array-key, Comment> $aComments
+     *
+     * @return void
+     */
+    public function addComments(array $aComments)
+    {
+        $this->aComments = array_merge($this->aComments, $aComments);
+    }
+
+    /**
+     * @return array<array-key, Comment>
+     */
+    public function getComments()
+    {
+        return $this->aComments;
+    }
+
+    /**
+     * @param array<array-key, Comment> $aComments
+     *
+     * @return void
+     */
+    public function setComments(array $aComments)
+    {
+        $this->aComments = $aComments;
+    }
+}

vendor/sabberworm/php-css-parser/src/CSSList/Document.php

@@ -0,0 +1,172 @@
+<?php
+
+namespace Sabberworm\CSS\CSSList;
+
+use Sabberworm\CSS\OutputFormat;
+use Sabberworm\CSS\Parsing\ParserState;
+use Sabberworm\CSS\Parsing\SourceException;
+use Sabberworm\CSS\Property\Selector;
+use Sabberworm\CSS\RuleSet\DeclarationBlock;
+use Sabberworm\CSS\RuleSet\RuleSet;
+use Sabberworm\CSS\Value\Value;
+
+/**
+ * The root `CSSList` of a parsed file. Contains all top-level CSS contents, mostly declaration blocks,
+ * but also any at-rules encountered.
+ */
+class Document extends CSSBlockList
+{
+    /**
+     * @param int $iLineNo
+     */
+    public function __construct($iLineNo = 0)
+    {
+        parent::__construct($iLineNo);
+    }
+
+    /**
+     * @return Document
+     *
+     * @throws SourceException
+     */
+    public static function parse(ParserState $oParserState)
+    {
+        $oDocument = new Document($oParserState->currentLine());
+        CSSList::parseList($oParserState, $oDocument);
+        return $oDocument;
+    }
+
+    /**
+     * Gets all `DeclarationBlock` objects recursively.
+     *
+     * @return array<int, DeclarationBlock>
+     */
+    public function getAllDeclarationBlocks()
+    {
+        /** @var array<int, DeclarationBlock> $aResult */
+        $aResult = [];
+        $this->allDeclarationBlocks($aResult);
+        return $aResult;
+    }
+
+    /**
+     * Gets all `DeclarationBlock` objects recursively.
+     *
+     * @return array<int, DeclarationBlock>
+     *
+     * @deprecated will be removed in version 9.0; use `getAllDeclarationBlocks()` instead
+     */
+    public function getAllSelectors()
+    {
+        return $this->getAllDeclarationBlocks();
+    }
+
+    /**
+     * Returns all `RuleSet` objects found recursively in the tree.
+     *
+     * @return array<int, RuleSet>
+     */
+    public function getAllRuleSets()
+    {
+        /** @var array<int, RuleSet> $aResult */
+        $aResult = [];
+        $this->allRuleSets($aResult);
+        return $aResult;
+    }
+
+    /**
+     * Returns all `Value` objects found recursively in the tree.
+     *
+     * @param CSSList|RuleSet|string $mElement
+     *        the `CSSList` or `RuleSet` to start the search from (defaults to the whole document).
+     *        If a string is given, it is used as rule name filter.
+     * @param bool $bSearchInFunctionArguments whether to also return Value objects used as Function arguments.
+     *
+     * @return array<int, Value>
+     *
+     * @see RuleSet->getRules()
+     */
+    public function getAllValues($mElement = null, $bSearchInFunctionArguments = false)
+    {
+        $sSearchString = null;
+        if ($mElement === null) {
+            $mElement = $this;
+        } elseif (is_string($mElement)) {
+            $sSearchString = $mElement;
+            $mElement = $this;
+        }
+        /** @var array<int, Value> $aResult */
+        $aResult = [];
+        $this->allValues($mElement, $aResult, $sSearchString, $bSearchInFunctionArguments);
+        return $aResult;
+    }
+
+    /**
+     * Returns all `Selector` objects found recursively in the tree.
+     *
+     * Note that this does not yield the full `DeclarationBlock` that the selector belongs to
+     * (and, currently, there is no way to get to that).
+     *
+     * @param string|null $sSpecificitySearch
+     *        An optional filter by specificity.
+     *        May contain a comparison operator and a number or just a number (defaults to "==").
+     *
+     * @return array<int, Selector>
+     * @example `getSelectorsBySpecificity('>= 100')`
+     *
+     */
+    public function getSelectorsBySpecificity($sSpecificitySearch = null)
+    {
+        /** @var array<int, Selector> $aResult */
+        $aResult = [];
+        $this->allSelectors($aResult, $sSpecificitySearch);
+        return $aResult;
+    }
+
+    /**
+     * Expands all shorthand properties to their long value.
+     *
+     * @return void
+     */
+    public function expandShorthands()
+    {
+        foreach ($this->getAllDeclarationBlocks() as $oDeclaration) {
+            $oDeclaration->expandShorthands();
+        }
+    }
+
+    /**
+     * Create shorthands properties whenever possible.
+     *
+     * @return void
+     */
+    public function createShorthands()
+    {
+        foreach ($this->getAllDeclarationBlocks() as $oDeclaration) {
+            $oDeclaration->createShorthands();
+        }
+    }
+
+    /**
+     * Overrides `render()` to make format argument optional.
+     *
+     * @param OutputFormat|null $oOutputFormat
+     *
+     * @return string
+     */
+    public function render(OutputFormat $oOutputFormat = null)
+    {
+        if ($oOutputFormat === null) {
+            $oOutputFormat = new OutputFormat();
+        }
+        return parent::render($oOutputFormat);
+    }
+
+    /**
+     * @return bool
+     */
+    public function isRootList()
+    {
+        return true;
+    }
+}

vendor/sabberworm/php-css-parser/src/CSSList/KeyFrame.php

@@ -0,0 +1,104 @@
+<?php
+
+namespace Sabberworm\CSS\CSSList;
+
+use Sabberworm\CSS\OutputFormat;
+use Sabberworm\CSS\Property\AtRule;
+
+class KeyFrame extends CSSList implements AtRule
+{
+    /**
+     * @var string|null
+     */
+    private $vendorKeyFrame;
+
+    /**
+     * @var string|null
+     */
+    private $animationName;
+
+    /**
+     * @param int $iLineNo
+     */
+    public function __construct($iLineNo = 0)
+    {
+        parent::__construct($iLineNo);
+        $this->vendorKeyFrame = null;
+        $this->animationName = null;
+    }
+
+    /**
+     * @param string $vendorKeyFrame
+     */
+    public function setVendorKeyFrame($vendorKeyFrame)
+    {
+        $this->vendorKeyFrame = $vendorKeyFrame;
+    }
+
+    /**
+     * @return string|null
+     */
+    public function getVendorKeyFrame()
+    {
+        return $this->vendorKeyFrame;
+    }
+
+    /**
+     * @param string $animationName
+     */
+    public function setAnimationName($animationName)
+    {
+        $this->animationName = $animationName;
+    }
+
+    /**
+     * @return string|null
+     */
+    public function getAnimationName()
+    {
+        return $this->animationName;
+    }
+
+    /**
+     * @return string
+     */
+    public function __toString()
+    {
+        return $this->render(new OutputFormat());
+    }
+
+    /**
+     * @return string
+     */
+    public function render(OutputFormat $oOutputFormat)
+    {
+        $sResult = "@{$this->vendorKeyFrame} {$this->animationName}{$oOutputFormat->spaceBeforeOpeningBrace()}{";
+        $sResult .= parent::render($oOutputFormat);
+        $sResult .= '}';
+        return $sResult;
+    }
+
+    /**
+     * @return bool
+     */
+    public function isRootList()
+    {
+        return false;
+    }
+
+    /**
+     * @return string|null
+     */
+    public function atRuleName()
+    {
+        return $this->vendorKeyFrame;
+    }
+
+    /**
+     * @return string|null
+     */
+    public function atRuleArgs()
+    {
+        return $this->animationName;
+    }
+}

vendor/sabberworm/php-css-parser/src/Comment/Comment.php

@@ -0,0 +1,71 @@
+<?php
+
+namespace Sabberworm\CSS\Comment;
+
+use Sabberworm\CSS\OutputFormat;
+use Sabberworm\CSS\Renderable;
+
+class Comment implements Renderable
+{
+    /**
+     * @var int
+     */
+    protected $iLineNo;
+
+    /**
+     * @var string
+     */
+    protected $sComment;
+
+    /**
+     * @param string $sComment
+     * @param int $iLineNo
+     */
+    public function __construct($sComment = '', $iLineNo = 0)
+    {
+        $this->sComment = $sComment;
+        $this->iLineNo = $iLineNo;
+    }
+
+    /**
+     * @return string
+     */
+    public function getComment()
+    {
+        return $this->sComment;
+    }
+
+    /**
+     * @return int
+     */
+    public function getLineNo()
+    {
+        return $this->iLineNo;
+    }
+
+    /**
+     * @param string $sComment
+     *
+     * @return void
+     */
+    public function setComment($sComment)
+    {
+        $this->sComment = $sComment;
+    }
+
+    /**
+     * @return string
+     */
+    public function __toString()
+    {
+        return $this->render(new OutputFormat());
+    }
+
+    /**
+     * @return string
+     */
+    public function render(OutputFormat $oOutputFormat)
+    {
+        return '/*' . $this->sComment . '*/';
+    }
+}

vendor/sabberworm/php-css-parser/src/Comment/Commentable.php

@@ -0,0 +1,25 @@
+<?php
+
+namespace Sabberworm\CSS\Comment;
+
+interface Commentable
+{
+    /**
+     * @param array<array-key, Comment> $aComments
+     *
+     * @return void
+     */
+    public function addComments(array $aComments);
+
+    /**
+     * @return array<array-key, Comment>
+     */
+    public function getComments();
+
+    /**
+     * @param array<array-key, Comment> $aComments
+     *
+     * @return void
+     */
+    public function setComments(array $aComments);
+}

vendor/sabberworm/php-css-parser/src/OutputFormat.php

@@ -0,0 +1,334 @@
+<?php
+
+namespace Sabberworm\CSS;
+
+/**
+ * Class OutputFormat
+ *
+ * @method OutputFormat setSemicolonAfterLastRule(bool $bSemicolonAfterLastRule) Set whether semicolons are added after
+ *     last rule.
+ */
+class OutputFormat
+{
+    /**
+     * Value format: `"` means double-quote, `'` means single-quote
+     *
+     * @var string
+     */
+    public $sStringQuotingType = '"';
+
+    /**
+     * Output RGB colors in hash notation if possible
+     *
+     * @var string
+     */
+    public $bRGBHashNotation = true;
+
+    /**
+     * Declaration format
+     *
+     * Semicolon after the last rule of a declaration block can be omitted. To do that, set this false.
+     *
+     * @var bool
+     */
+    public $bSemicolonAfterLastRule = true;
+
+    /**
+     * Spacing
+     * Note that these strings are not sanity-checked: the value should only consist of whitespace
+     * Any newline character will be indented according to the current level.
+     * The triples (After, Before, Between) can be set using a wildcard (e.g. `$oFormat->set('Space*Rules', "\n");`)
+     */
+    public $sSpaceAfterRuleName = ' ';
+
+    /**
+     * @var string
+     */
+    public $sSpaceBeforeRules = '';
+
+    /**
+     * @var string
+     */
+    public $sSpaceAfterRules = '';
+
+    /**
+     * @var string
+     */
+    public $sSpaceBetweenRules = '';
+
+    /**
+     * @var string
+     */
+    public $sSpaceBeforeBlocks = '';
+
+    /**
+     * @var string
+     */
+    public $sSpaceAfterBlocks = '';
+
+    /**
+     * @var string
+     */
+    public $sSpaceBetweenBlocks = "\n";
+
+    /**
+     * Content injected in and around at-rule blocks.
+     *
+     * @var string
+     */
+    public $sBeforeAtRuleBlock = '';
+
+    /**
+     * @var string
+     */
+    public $sAfterAtRuleBlock = '';
+
+    /**
+     * This is what’s printed before and after the comma if a declaration block contains multiple selectors.
+     *
+     * @var string
+     */
+    public $sSpaceBeforeSelectorSeparator = '';
+
+    /**
+     * @var string
+     */
+    public $sSpaceAfterSelectorSeparator = ' ';
+
+    /**
+     * This is what’s printed after the comma of value lists
+     *
+     * @var string
+     */
+    public $sSpaceBeforeListArgumentSeparator = '';
+
+    /**
+     * @var string
+     */
+    public $sSpaceAfterListArgumentSeparator = '';
+
+    /**
+     * @var string
+     */
+    public $sSpaceBeforeOpeningBrace = ' ';
+
+    /**
+     * Content injected in and around declaration blocks.
+     *
+     * @var string
+     */
+    public $sBeforeDeclarationBlock = '';
+
+    /**
+     * @var string
+     */
+    public $sAfterDeclarationBlockSelectors = '';
+
+    /**
+     * @var string
+     */
+    public $sAfterDeclarationBlock = '';
+
+    /**
+     * Indentation character(s) per level. Only applicable if newlines are used in any of the spacing settings.
+     *
+     * @var string
+     */
+    public $sIndentation = "\t";
+
+    /**
+     * Output exceptions.
+     *
+     * @var bool
+     */
+    public $bIgnoreExceptions = false;
+
+    /**
+     * @var OutputFormatter|null
+     */
+    private $oFormatter = null;
+
+    /**
+     * @var OutputFormat|null
+     */
+    private $oNextLevelFormat = null;
+
+    /**
+     * @var int
+     */
+    private $iIndentationLevel = 0;
+
+    public function __construct()
+    {
+    }
+
+    /**
+     * @param string $sName
+     *
+     * @return string|null
+     */
+    public function get($sName)
+    {
+        $aVarPrefixes = ['a', 's', 'm', 'b', 'f', 'o', 'c', 'i'];
+        foreach ($aVarPrefixes as $sPrefix) {
+            $sFieldName = $sPrefix . ucfirst($sName);
+            if (isset($this->$sFieldName)) {
+                return $this->$sFieldName;
+            }
+        }
+        return null;
+    }
+
+    /**
+     * @param array<array-key, string>|string $aNames
+     * @param mixed $mValue
+     *
+     * @return self|false
+     */
+    public function set($aNames, $mValue)
+    {
+        $aVarPrefixes = ['a', 's', 'm', 'b', 'f', 'o', 'c', 'i'];
+        if (is_string($aNames) && strpos($aNames, '*') !== false) {
+            $aNames =
+                [
+                    str_replace('*', 'Before', $aNames),
+                    str_replace('*', 'Between', $aNames),
+                    str_replace('*', 'After', $aNames),
+                ];
+        } elseif (!is_array($aNames)) {
+            $aNames = [$aNames];
+        }
+        foreach ($aVarPrefixes as $sPrefix) {
+            $bDidReplace = false;
+            foreach ($aNames as $sName) {
+                $sFieldName = $sPrefix . ucfirst($sName);
+                if (isset($this->$sFieldName)) {
+                    $this->$sFieldName = $mValue;
+                    $bDidReplace = true;
+                }
+            }
+            if ($bDidReplace) {
+                return $this;
+            }
+        }
+        // Break the chain so the user knows this option is invalid
+        return false;
+    }
+
+    /**
+     * @param string $sMethodName
+     * @param array<array-key, mixed> $aArguments
+     *
+     * @return mixed
+     *
+     * @throws \Exception
+     */
+    public function __call($sMethodName, array $aArguments)
+    {
+        if (strpos($sMethodName, 'set') === 0) {
+            return $this->set(substr($sMethodName, 3), $aArguments[0]);
+        } elseif (strpos($sMethodName, 'get') === 0) {
+            return $this->get(substr($sMethodName, 3));
+        } elseif (method_exists(OutputFormatter::class, $sMethodName)) {
+            return call_user_func_array([$this->getFormatter(), $sMethodName], $aArguments);
+        } else {
+            throw new \Exception('Unknown OutputFormat method called: ' . $sMethodName);
+        }
+    }
+
+    /**
+     * @param int $iNumber
+     *
+     * @return self
+     */
+    public function indentWithTabs($iNumber = 1)
+    {
+        return $this->setIndentation(str_repeat("\t", $iNumber));
+    }
+
+    /**
+     * @param int $iNumber
+     *
+     * @return self
+     */
+    public function indentWithSpaces($iNumber = 2)
+    {
+        return $this->setIndentation(str_repeat(" ", $iNumber));
+    }
+
+    /**
+     * @return OutputFormat
+     */
+    public function nextLevel()
+    {
+        if ($this->oNextLevelFormat === null) {
+            $this->oNextLevelFormat = clone $this;
+            $this->oNextLevelFormat->iIndentationLevel++;
+            $this->oNextLevelFormat->oFormatter = null;
+        }
+        return $this->oNextLevelFormat;
+    }
+
+    /**
+     * @return void
+     */
+    public function beLenient()
+    {
+        $this->bIgnoreExceptions = true;
+    }
+
+    /**
+     * @return OutputFormatter
+     */
+    public function getFormatter()
+    {
+        if ($this->oFormatter === null) {
+            $this->oFormatter = new OutputFormatter($this);
+        }
+        return $this->oFormatter;
+    }
+
+    /**
+     * @return int
+     */
+    public function level()
+    {
+        return $this->iIndentationLevel;
+    }
+
+    /**
+     * Creates an instance of this class without any particular formatting settings.
+     *
+     * @return self
+     */
+    public static function create()
+    {
+        return new OutputFormat();
+    }
+
+    /**
+     * Creates an instance of this class with a preset for compact formatting.
+     *
+     * @return self
+     */
+    public static function createCompact()
+    {
+        $format = self::create();
+        $format->set('Space*Rules', "")->set('Space*Blocks', "")->setSpaceAfterRuleName('')
+            ->setSpaceBeforeOpeningBrace('')->setSpaceAfterSelectorSeparator('');
+        return $format;
+    }
+
+    /**
+     * Creates an instance of this class with a preset for pretty formatting.
+     *
+     * @return self
+     */
+    public static function createPretty()
+    {
+        $format = self::create();
+        $format->set('Space*Rules', "\n")->set('Space*Blocks', "\n")
+            ->setSpaceBetweenBlocks("\n\n")->set('SpaceAfterListArgumentSeparator', ['default' => '', ',' => ' ']);
+        return $format;
+    }
+}

vendor/sabberworm/php-css-parser/src/OutputFormatter.php

@@ -0,0 +1,231 @@
+<?php
+
+namespace Sabberworm\CSS;
+
+use Sabberworm\CSS\Parsing\OutputException;
+
+class OutputFormatter
+{
+    /**
+     * @var OutputFormat
+     */
+    private $oFormat;
+
+    public function __construct(OutputFormat $oFormat)
+    {
+        $this->oFormat = $oFormat;
+    }
+
+    /**
+     * @param string $sName
+     * @param string|null $sType
+     *
+     * @return string
+     */
+    public function space($sName, $sType = null)
+    {
+        $sSpaceString = $this->oFormat->get("Space$sName");
+        // If $sSpaceString is an array, we have multiple values configured
+        // depending on the type of object the space applies to
+        if (is_array($sSpaceString)) {
+            if ($sType !== null && isset($sSpaceString[$sType])) {
+                $sSpaceString = $sSpaceString[$sType];
+            } else {
+                $sSpaceString = reset($sSpaceString);
+            }
+        }
+        return $this->prepareSpace($sSpaceString);
+    }
+
+    /**
+     * @return string
+     */
+    public function spaceAfterRuleName()
+    {
+        return $this->space('AfterRuleName');
+    }
+
+    /**
+     * @return string
+     */
+    public function spaceBeforeRules()
+    {
+        return $this->space('BeforeRules');
+    }
+
+    /**
+     * @return string
+     */
+    public function spaceAfterRules()
+    {
+        return $this->space('AfterRules');
+    }
+
+    /**
+     * @return string
+     */
+    public function spaceBetweenRules()
+    {
+        return $this->space('BetweenRules');
+    }
+
+    /**
+     * @return string
+     */
+    public function spaceBeforeBlocks()
+    {
+        return $this->space('BeforeBlocks');
+    }
+
+    /**
+     * @return string
+     */
+    public function spaceAfterBlocks()
+    {
+        return $this->space('AfterBlocks');
+    }
+
+    /**
+     * @return string
+     */
+    public function spaceBetweenBlocks()
+    {
+        return $this->space('BetweenBlocks');
+    }
+
+    /**
+     * @return string
+     */
+    public function spaceBeforeSelectorSeparator()
+    {
+        return $this->space('BeforeSelectorSeparator');
+    }
+
+    /**
+     * @return string
+     */
+    public function spaceAfterSelectorSeparator()
+    {
+        return $this->space('AfterSelectorSeparator');
+    }
+
+    /**
+     * @param string $sSeparator
+     *
+     * @return string
+     */
+    public function spaceBeforeListArgumentSeparator($sSeparator)
+    {
+        return $this->space('BeforeListArgumentSeparator', $sSeparator);
+    }
+
+    /**
+     * @param string $sSeparator
+     *
+     * @return string
+     */
+    public function spaceAfterListArgumentSeparator($sSeparator)
+    {
+        return $this->space('AfterListArgumentSeparator', $sSeparator);
+    }
+
+    /**
+     * @return string
+     */
+    public function spaceBeforeOpeningBrace()
+    {
+        return $this->space('BeforeOpeningBrace');
+    }
+
+    /**
+     * Runs the given code, either swallowing or passing exceptions, depending on the `bIgnoreExceptions` setting.
+     *
+     * @param string $cCode the name of the function to call
+     *
+     * @return string|null
+     */
+    public function safely($cCode)
+    {
+        if ($this->oFormat->get('IgnoreExceptions')) {
+            // If output exceptions are ignored, run the code with exception guards
+            try {
+                return $cCode();
+            } catch (OutputException $e) {
+                return null;
+            } // Do nothing
+        } else {
+            // Run the code as-is
+            return $cCode();
+        }
+    }
+
+    /**
+     * Clone of the `implode` function, but calls `render` with the current output format instead of `__toString()`.
+     *
+     * @param string $sSeparator
+     * @param array<array-key, Renderable|string> $aValues
+     * @param bool $bIncreaseLevel
+     *
+     * @return string
+     */
+    public function implode($sSeparator, array $aValues, $bIncreaseLevel = false)
+    {
+        $sResult = '';
+        $oFormat = $this->oFormat;
+        if ($bIncreaseLevel) {
+            $oFormat = $oFormat->nextLevel();
+        }
+        $bIsFirst = true;
+        foreach ($aValues as $mValue) {
+            if ($bIsFirst) {
+                $bIsFirst = false;
+            } else {
+                $sResult .= $sSeparator;
+            }
+            if ($mValue instanceof Renderable) {
+                $sResult .= $mValue->render($oFormat);
+            } else {
+                $sResult .= $mValue;
+            }
+        }
+        return $sResult;
+    }
+
+    /**
+     * @param string $sString
+     *
+     * @return string
+     */
+    public function removeLastSemicolon($sString)
+    {
+        if ($this->oFormat->get('SemicolonAfterLastRule')) {
+            return $sString;
+        }
+        $sString = explode(';', $sString);
+        if (count($sString) < 2) {
+            return $sString[0];
+        }
+        $sLast = array_pop($sString);
+        $sNextToLast = array_pop($sString);
+        array_push($sString, $sNextToLast . $sLast);
+        return implode(';', $sString);
+    }
+
+    /**
+     * @param string $sSpaceString
+     *
+     * @return string
+     */
+    private function prepareSpace($sSpaceString)
+    {
+        return str_replace("\n", "\n" . $this->indent(), $sSpaceString);
+    }
+
+    /**
+     * @return string
+     */
+    private function indent()
+    {
+        return str_repeat($this->oFormat->sIndentation, $this->oFormat->level());
+    }
+}

vendor/sabberworm/php-css-parser/src/Parser.php

@@ -0,0 +1,60 @@
+<?php
+
+namespace Sabberworm\CSS;
+
+use Sabberworm\CSS\CSSList\Document;
+use Sabberworm\CSS\Parsing\ParserState;
+use Sabberworm\CSS\Parsing\SourceException;
+
+/**
+ * This class parses CSS from text into a data structure.
+ */
+class Parser
+{
+    /**
+     * @var ParserState
+     */
+    private $oParserState;
+
+    /**
+     * @param string $sText
+     * @param Settings|null $oParserSettings
+     * @param int $iLineNo the line number (starting from 1, not from 0)
+     */
+    public function __construct($sText, Settings $oParserSettings = null, $iLineNo = 1)
+    {
+        if ($oParserSettings === null) {
+            $oParserSettings = Settings::create();
+        }
+        $this->oParserState = new ParserState($sText, $oParserSettings, $iLineNo);
+    }
+
+    /**
+     * @param string $sCharset
+     *
+     * @return void
+     */
+    public function setCharset($sCharset)
+    {
+        $this->oParserState->setCharset($sCharset);
+    }
+
+    /**
+     * @return void
+     */
+    public function getCharset()
+    {
+        // Note: The `return` statement is missing here. This is a bug that needs to be fixed.
+        $this->oParserState->getCharset();
+    }
+
+    /**
+     * @return Document
+     *
+     * @throws SourceException
+     */
+    public function parse()
+    {
+        return Document::parse($this->oParserState);
+    }
+}

vendor/sabberworm/php-css-parser/src/Parsing/OutputException.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace Sabberworm\CSS\Parsing;
+
+/**
+ * Thrown if the CSS parser attempts to print something invalid.
+ */
+class OutputException extends SourceException
+{
+    /**
+     * @param string $sMessage
+     * @param int $iLineNo
+     */
+    public function __construct($sMessage, $iLineNo = 0)
+    {
+        parent::__construct($sMessage, $iLineNo);
+    }
+}

vendor/sabberworm/php-css-parser/src/Parsing/ParserState.php

@@ -0,0 +1,516 @@
+<?php
+
+namespace Sabberworm\CSS\Parsing;
+
+use Sabberworm\CSS\Comment\Comment;
+use Sabberworm\CSS\Settings;
+
+class ParserState
+{
+    /**
+     * @var null
+     */
+    const EOF = null;
+
+    /**
+     * @var Settings
+     */
+    private $oParserSettings;
+
+    /**
+     * @var string
+     */
+    private $sText;
+
+    /**
+     * @var array<int, string>
+     */
+    private $aText;
+
+    /**
+     * @var int
+     */
+    private $iCurrentPosition;
+
+    /**
+     * @var string
+     */
+    private $sCharset;
+
+    /**
+     * @var int
+     */
+    private $iLength;
+
+    /**
+     * @var int
+     */
+    private $iLineNo;
+
+    /**
+     * @param string $sText
+     * @param int $iLineNo
+     */
+    public function __construct($sText, Settings $oParserSettings, $iLineNo = 1)
+    {
+        $this->oParserSettings = $oParserSettings;
+        $this->sText = $sText;
+        $this->iCurrentPosition = 0;
+        $this->iLineNo = $iLineNo;
+        $this->setCharset($this->oParserSettings->sDefaultCharset);
+    }
+
+    /**
+     * @param string $sCharset
+     *
+     * @return void
+     */
+    public function setCharset($sCharset)
+    {
+        $this->sCharset = $sCharset;
+        $this->aText = $this->strsplit($this->sText);
+        if (is_array($this->aText)) {
+            $this->iLength = count($this->aText);
+        }
+    }
+
+    /**
+     * @return string
+     */
+    public function getCharset()
+    {
+        return $this->sCharset;
+    }
+
+    /**
+     * @return int
+     */
+    public function currentLine()
+    {
+        return $this->iLineNo;
+    }
+
+    /**
+     * @return int
+     */
+    public function currentColumn()
+    {
+        return $this->iCurrentPosition;
+    }
+
+    /**
+     * @return Settings
+     */
+    public function getSettings()
+    {
+        return $this->oParserSettings;
+    }
+
+    /**
+     * @param bool $bIgnoreCase
+     *
+     * @return string
+     *
+     * @throws UnexpectedTokenException
+     */
+    public function parseIdentifier($bIgnoreCase = true)
+    {
+        $sResult = $this->parseCharacter(true);
+        if ($sResult === null) {
+            throw new UnexpectedTokenException($sResult, $this->peek(5), 'identifier', $this->iLineNo);
+        }
+        $sCharacter = null;
+        while (($sCharacter = $this->parseCharacter(true)) !== null) {
+            if (preg_match('/[a-zA-Z0-9\x{00A0}-\x{FFFF}_-]/Sux', $sCharacter)) {
+                $sResult .= $sCharacter;
+            } else {
+                $sResult .= '\\' . $sCharacter;
+            }
+        }
+        if ($bIgnoreCase) {
+            $sResult = $this->strtolower($sResult);
+        }
+        return $sResult;
+    }
+
+    /**
+     * @param bool $bIsForIdentifier
+     *
+     * @return string|null
+     *
+     * @throws UnexpectedEOFException
+     * @throws UnexpectedTokenException
+     */
+    public function parseCharacter($bIsForIdentifier)
+    {
+        if ($this->peek() === '\\') {
+            if (
+                $bIsForIdentifier && $this->oParserSettings->bLenientParsing
+                && ($this->comes('\0') || $this->comes('\9'))
+            ) {
+                // Non-strings can contain \0 or \9 which is an IE hack supported in lenient parsing.
+                return null;
+            }
+            $this->consume('\\');
+            if ($this->comes('\n') || $this->comes('\r')) {
+                return '';
+            }
+            if (preg_match('/[0-9a-fA-F]/Su', $this->peek()) === 0) {
+                return $this->consume(1);
+            }
+            $sUnicode = $this->consumeExpression('/^[0-9a-fA-F]{1,6}/u', 6);
+            if ($this->strlen($sUnicode) < 6) {
+                // Consume whitespace after incomplete unicode escape
+                if (preg_match('/\\s/isSu', $this->peek())) {
+                    if ($this->comes('\r\n')) {
+                        $this->consume(2);
+                    } else {
+                        $this->consume(1);
+                    }
+                }
+            }
+            $iUnicode = intval($sUnicode, 16);
+            $sUtf32 = "";
+            for ($i = 0; $i < 4; ++$i) {
+                $sUtf32 .= chr($iUnicode & 0xff);
+                $iUnicode = $iUnicode >> 8;
+            }
+            return iconv('utf-32le', $this->sCharset, $sUtf32);
+        }
+        if ($bIsForIdentifier) {
+            $peek = ord($this->peek());
+            // Ranges: a-z A-Z 0-9 - _
+            if (
+                ($peek >= 97 && $peek <= 122)
+                || ($peek >= 65 && $peek <= 90)
+                || ($peek >= 48 && $peek <= 57)
+                || ($peek === 45)
+                || ($peek === 95)
+                || ($peek > 0xa1)
+            ) {
+                return $this->consume(1);
+            }
+        } else {
+            return $this->consume(1);
+        }
+        return null;
+    }
+
+    /**
+     * @return array<int, Comment>|void
+     *
+     * @throws UnexpectedEOFException
+     * @throws UnexpectedTokenException
+     */
+    public function consumeWhiteSpace()
+    {
+        $comments = [];
+        do {
+            while (preg_match('/\\s/isSu', $this->peek()) === 1) {
+                $this->consume(1);
+            }
+            if ($this->oParserSettings->bLenientParsing) {
+                try {
+                    $oComment = $this->consumeComment();
+                } catch (UnexpectedEOFException $e) {
+                    $this->iCurrentPosition = $this->iLength;
+                    return;
+                }
+            } else {
+                $oComment = $this->consumeComment();
+            }
+            if ($oComment !== false) {
+                $comments[] = $oComment;
+            }
+        } while ($oComment !== false);
+        return $comments;
+    }
+
+    /**
+     * @param string $sString
+     * @param bool $bCaseInsensitive
+     *
+     * @return bool
+     */
+    public function comes($sString, $bCaseInsensitive = false)
+    {
+        $sPeek = $this->peek(strlen($sString));
+        return ($sPeek == '')
+            ? false
+            : $this->streql($sPeek, $sString, $bCaseInsensitive);
+    }
+
+    /**
+     * @param int $iLength
+     * @param int $iOffset
+     *
+     * @return string
+     */
+    public function peek($iLength = 1, $iOffset = 0)
+    {
+        $iOffset += $this->iCurrentPosition;
+        if ($iOffset >= $this->iLength) {
+            return '';
+        }
+        return $this->substr($iOffset, $iLength);
+    }
+
+    /**
+     * @param int $mValue
+     *
+     * @return string
+     *
+     * @throws UnexpectedEOFException
+     * @throws UnexpectedTokenException
+     */
+    public function consume($mValue = 1)
+    {
+        if (is_string($mValue)) {
+            $iLineCount = substr_count($mValue, "\n");
+            $iLength = $this->strlen($mValue);
+            if (!$this->streql($this->substr($this->iCurrentPosition, $iLength), $mValue)) {
+                throw new UnexpectedTokenException($mValue, $this->peek(max($iLength, 5)), $this->iLineNo);
+            }
+            $this->iLineNo += $iLineCount;
+            $this->iCurrentPosition += $this->strlen($mValue);
+            return $mValue;
+        } else {
+            if ($this->iCurrentPosition + $mValue > $this->iLength) {
+                throw new UnexpectedEOFException($mValue, $this->peek(5), 'count', $this->iLineNo);
+            }
+            $sResult = $this->substr($this->iCurrentPosition, $mValue);
+            $iLineCount = substr_count($sResult, "\n");
+            $this->iLineNo += $iLineCount;
+            $this->iCurrentPosition += $mValue;
+            return $sResult;
+        }
+    }
+
+    /**
+     * @param string $mExpression
+     * @param int|null $iMaxLength
+     *
+     * @return string
+     *
+     * @throws UnexpectedEOFException
+     * @throws UnexpectedTokenException
+     */
+    public function consumeExpression($mExpression, $iMaxLength = null)
+    {
+        $aMatches = null;
+        $sInput = $iMaxLength !== null ? $this->peek($iMaxLength) : $this->inputLeft();
+        if (preg_match($mExpression, $sInput, $aMatches, PREG_OFFSET_CAPTURE) === 1) {
+            return $this->consume($aMatches[0][0]);
+        }
+        throw new UnexpectedTokenException($mExpression, $this->peek(5), 'expression', $this->iLineNo);
+    }
+
+    /**
+     * @return Comment|false
+     */
+    public function consumeComment()
+    {
+        $mComment = false;
+        if ($this->comes('/*')) {
+            $iLineNo = $this->iLineNo;
+            $this->consume(1);
+            $mComment = '';
+            while (($char = $this->consume(1)) !== '') {
+                $mComment .= $char;
+                if ($this->comes('*/')) {
+                    $this->consume(2);
+                    break;
+                }
+            }
+        }
+
+        if ($mComment !== false) {
+            // We skip the * which was included in the comment.
+            return new Comment(substr($mComment, 1), $iLineNo);
+        }
+
+        return $mComment;
+    }
+
+    /**
+     * @return bool
+     */
+    public function isEnd()
+    {
+        return $this->iCurrentPosition >= $this->iLength;
+    }
+
+    /**
+     * @param array<array-key, string>|string $aEnd
+     * @param string $bIncludeEnd
+     * @param string $consumeEnd
+     * @param array<int, Comment> $comments
+     *
+     * @return string
+     *
+     * @throws UnexpectedEOFException
+     * @throws UnexpectedTokenException
+     */
+    public function consumeUntil($aEnd, $bIncludeEnd = false, $consumeEnd = false, array &$comments = [])
+    {
+        $aEnd = is_array($aEnd) ? $aEnd : [$aEnd];
+        $out = '';
+        $start = $this->iCurrentPosition;
+
+        while (!$this->isEnd()) {
+            $char = $this->consume(1);
+            if (in_array($char, $aEnd)) {
+                if ($bIncludeEnd) {
+                    $out .= $char;
+                } elseif (!$consumeEnd) {
+                    $this->iCurrentPosition -= $this->strlen($char);
+                }
+                return $out;
+            }
+            $out .= $char;
+            if ($comment = $this->consumeComment()) {
+                $comments[] = $comment;
+            }
+        }
+
+        if (in_array(self::EOF, $aEnd)) {
+            return $out;
+        }
+
+        $this->iCurrentPosition = $start;
+        throw new UnexpectedEOFException(
+            'One of ("' . implode('","', $aEnd) . '")',
+            $this->peek(5),
+            'search',
+            $this->iLineNo
+        );
+    }
+
+    /**
+     * @return string
+     */
+    private function inputLeft()
+    {
+        return $this->substr($this->iCurrentPosition, -1);
+    }
+
+    /**
+     * @param string $sString1
+     * @param string $sString2
+     * @param bool $bCaseInsensitive
+     *
+     * @return bool
+     */
+    public function streql($sString1, $sString2, $bCaseInsensitive = true)
+    {
+        if ($bCaseInsensitive) {
+            return $this->strtolower($sString1) === $this->strtolower($sString2);
+        } else {
+            return $sString1 === $sString2;
+        }
+    }
+
+    /**
+     * @param int $iAmount
+     *
+     * @return void
+     */
+    public function backtrack($iAmount)
+    {
+        $this->iCurrentPosition -= $iAmount;
+    }
+
+    /**
+     * @param string $sString
+     *
+     * @return int
+     */
+    public function strlen($sString)
+    {
+        if ($this->oParserSettings->bMultibyteSupport) {
+            return mb_strlen($sString, $this->sCharset);
+        } else {
+            return strlen($sString);
+        }
+    }
+
+    /**
+     * @param int $iStart
+     * @param int $iLength
+     *
+     * @return string
+     */
+    private function substr($iStart, $iLength)
+    {
+        if ($iLength < 0) {
+            $iLength = $this->iLength - $iStart + $iLength;
+        }
+        if ($iStart + $iLength > $this->iLength) {
+            $iLength = $this->iLength - $iStart;
+        }
+        $sResult = '';
+        while ($iLength > 0) {
+            $sResult .= $this->aText[$iStart];
+            $iStart++;
+            $iLength--;
+        }
+        return $sResult;
+    }
+
+    /**
+     * @param string $sString
+     *
+     * @return string
+     */
+    private function strtolower($sString)
+    {
+        if ($this->oParserSettings->bMultibyteSupport) {
+            return mb_strtolower($sString, $this->sCharset);
+        } else {
+            return strtolower($sString);
+        }
+    }
+
+    /**
+     * @param string $sString
+     *
+     * @return array<int, string>
+     */
+    private function strsplit($sString)
+    {
+        if ($this->oParserSettings->bMultibyteSupport) {
+            if ($this->streql($this->sCharset, 'utf-8')) {
+                return preg_split('//u', $sString, -1, PREG_SPLIT_NO_EMPTY);
+            } else {
+                $iLength = mb_strlen($sString, $this->sCharset);
+                $aResult = [];
+                for ($i = 0; $i < $iLength; ++$i) {
+                    $aResult[] = mb_substr($sString, $i, 1, $this->sCharset);
+                }
+                return $aResult;
+            }
+        } else {
+            if ($sString === '') {
+                return [];
+            } else {
+                return str_split($sString);
+            }
+        }
+    }
+
+    /**
+     * @param string $sString
+     * @param string $sNeedle
+     * @param int $iOffset
+     *
+     * @return int|false
+     */
+    private function strpos($sString, $sNeedle, $iOffset)
+    {
+        if ($this->oParserSettings->bMultibyteSupport) {
+            return mb_strpos($sString, $sNeedle, $iOffset, $this->sCharset);
+        } else {
+            return strpos($sString, $sNeedle, $iOffset);
+        }
+    }
+}

vendor/sabberworm/php-css-parser/src/Parsing/SourceException.php

@@ -0,0 +1,32 @@
+<?php
+
+namespace Sabberworm\CSS\Parsing;
+
+class SourceException extends \Exception
+{
+    /**
+     * @var int
+     */
+    private $iLineNo;
+
+    /**
+     * @param string $sMessage
+     * @param int $iLineNo
+     */
+    public function __construct($sMessage, $iLineNo = 0)
+    {
+        $this->iLineNo = $iLineNo;
+        if (!empty($iLineNo)) {
+            $sMessage .= " [line no: $iLineNo]";
+        }
+        parent::__construct($sMessage);
+    }
+
+    /**
+     * @return int
+     */
+    public function getLineNo()
+    {
+        return $this->iLineNo;
+    }
+}

vendor/sabberworm/php-css-parser/src/Parsing/UnexpectedEOFException.php

@@ -0,0 +1,12 @@
+<?php
+
+namespace Sabberworm\CSS\Parsing;
+
+/**
+ * Thrown if the CSS parser encounters end of file it did not expect.
+ *
+ * Extends `UnexpectedTokenException` in order to preserve backwards compatibility.
+ */
+class UnexpectedEOFException extends UnexpectedTokenException
+{
+}

vendor/sabberworm/php-css-parser/src/Parsing/UnexpectedTokenException.php

@@ -0,0 +1,51 @@
+<?php
+
+namespace Sabberworm\CSS\Parsing;
+
+/**
+ * Thrown if the CSS parser encounters a token it did not expect.
+ */
+class UnexpectedTokenException extends SourceException
+{
+    /**
+     * @var string
+     */
+    private $sExpected;
+
+    /**
+     * @var string
+     */
+    private $sFound;
+
+    /**
+     * Possible values: literal, identifier, count, expression, search
+     *
+     * @var string
+     */
+    private $sMatchType;
+
+    /**
+     * @param string $sExpected
+     * @param string $sFound
+     * @param string $sMatchType
+     * @param int $iLineNo
+     */
+    public function __construct($sExpected, $sFound, $sMatchType = 'literal', $iLineNo = 0)
+    {
+        $this->sExpected = $sExpected;
+        $this->sFound = $sFound;
+        $this->sMatchType = $sMatchType;
+        $sMessage = "Token “{$sExpected}” ({$sMatchType}) not found. Got “{$sFound}”.";
+        if ($this->sMatchType === 'search') {
+            $sMessage = "Search for “{$sExpected}” returned no results. Context: “{$sFound}”.";
+        } elseif ($this->sMatchType === 'count') {
+            $sMessage = "Next token was expected to have {$sExpected} chars. Context: “{$sFound}”.";
+        } elseif ($this->sMatchType === 'identifier') {
+            $sMessage = "Identifier expected. Got “{$sFound}”";
+        } elseif ($this->sMatchType === 'custom') {
+            $sMessage = trim("$sExpected $sFound");
+        }
+
+        parent::__construct($sMessage, $iLineNo);
+    }
+}

vendor/sabberworm/php-css-parser/src/Property/AtRule.php

@@ -0,0 +1,34 @@
+<?php
+
+namespace Sabberworm\CSS\Property;
+
+use Sabberworm\CSS\Comment\Commentable;
+use Sabberworm\CSS\Renderable;
+
+interface AtRule extends Renderable, Commentable
+{
+    /**
+     * Since there are more set rules than block rules,
+     * we’re whitelisting the block rules and have anything else be treated as a set rule.
+     *
+     * @var string
+     */
+    const BLOCK_RULES = 'media/document/supports/region-style/font-feature-values';
+
+    /**
+     * … and more font-specific ones (to be used inside font-feature-values)
+     *
+     * @var string
+     */
+    const SET_RULES = 'font-face/counter-style/page/swash/styleset/annotation';
+
+    /**
+     * @return string|null
+     */
+    public function atRuleName();
+
+    /**
+     * @return string|null
+     */
+    public function atRuleArgs();
+}

vendor/sabberworm/php-css-parser/src/Property/CSSNamespace.php

@@ -0,0 +1,154 @@
+<?php
+
+namespace Sabberworm\CSS\Property;
+
+use Sabberworm\CSS\Comment\Comment;
+use Sabberworm\CSS\OutputFormat;
+
+/**
+ * `CSSNamespace` represents an `@namespace` rule.
+ */
+class CSSNamespace implements AtRule
+{
+    /**
+     * @var string
+     */
+    private $mUrl;
+
+    /**
+     * @var string
+     */
+    private $sPrefix;
+
+    /**
+     * @var int
+     */
+    private $iLineNo;
+
+    /**
+     * @var array<array-key, Comment>
+     */
+    protected $aComments;
+
+    /**
+     * @param string $mUrl
+     * @param string|null $sPrefix
+     * @param int $iLineNo
+     */
+    public function __construct($mUrl, $sPrefix = null, $iLineNo = 0)
+    {
+        $this->mUrl = $mUrl;
+        $this->sPrefix = $sPrefix;
+        $this->iLineNo = $iLineNo;
+        $this->aComments = [];
+    }
+
+    /**
+     * @return int
+     */
+    public function getLineNo()
+    {
+        return $this->iLineNo;
+    }
+
+    /**
+     * @return string
+     */
+    public function __toString()
+    {
+        return $this->render(new OutputFormat());
+    }
+
+    /**
+     * @return string
+     */
+    public function render(OutputFormat $oOutputFormat)
+    {
+        return '@namespace ' . ($this->sPrefix === null ? '' : $this->sPrefix . ' ')
+            . $this->mUrl->render($oOutputFormat) . ';';
+    }
+
+    /**
+     * @return string
+     */
+    public function getUrl()
+    {
+        return $this->mUrl;
+    }
+
+    /**
+     * @return string|null
+     */
+    public function getPrefix()
+    {
+        return $this->sPrefix;
+    }
+
+    /**
+     * @param string $mUrl
+     *
+     * @return void
+     */
+    public function setUrl($mUrl)
+    {
+        $this->mUrl = $mUrl;
+    }
+
+    /**
+     * @param string $sPrefix
+     *
+     * @return void
+     */
+    public function setPrefix($sPrefix)
+    {
+        $this->sPrefix = $sPrefix;
+    }
+
+    /**
+     * @return string
+     */
+    public function atRuleName()
+    {
+        return 'namespace';
+    }
+
+    /**
+     * @return array<int, string>
+     */
+    public function atRuleArgs()
+    {
+        $aResult = [$this->mUrl];
+        if ($this->sPrefix) {
+            array_unshift($aResult, $this->sPrefix);
+        }
+        return $aResult;
+    }
+
+    /**
+     * @param array<array-key, Comment> $aComments
+     *
+     * @return void
+     */
+    public function addComments(array $aComments)
+    {
+        $this->aComments = array_merge($this->aComments, $aComments);
+    }
+
+    /**
+     * @return array<array-key, Comment>
+     */
+    public function getComments()
+    {
+        return $this->aComments;
+    }
+
+    /**
+     * @param array<array-key, Comment> $aComments
+     *
+     * @return void
+     */
+    public function setComments(array $aComments)
+    {
+        $this->aComments = $aComments;
+    }
+}

vendor/sabberworm/php-css-parser/src/Property/Charset.php

@@ -0,0 +1,129 @@
+<?php
+
+namespace Sabberworm\CSS\Property;
+
+use Sabberworm\CSS\Comment\Comment;
+use Sabberworm\CSS\OutputFormat;
+
+/**
+ * Class representing an `@charset` rule.
+ *
+ * The following restrictions apply:
+ * - May not be found in any CSSList other than the Document.
+ * - May only appear at the very top of a Document’s contents.
+ * - Must not appear more than once.
+ */
+class Charset implements AtRule
+{
+    /**
+     * @var string
+     */
+    private $sCharset;
+
+    /**
+     * @var int
+     */
+    protected $iLineNo;
+
+    /**
+     * @var array<array-key, Comment>
+     */
+    protected $aComments;
+
+    /**
+     * @param string $sCharset
+     * @param int $iLineNo
+     */
+    public function __construct($sCharset, $iLineNo = 0)
+    {
+        $this->sCharset = $sCharset;
+        $this->iLineNo = $iLineNo;
+        $this->aComments = [];
+    }
+
+    /**
+     * @return int
+     */
+    public function getLineNo()
+    {
+        return $this->iLineNo;
+    }
+
+    /**
+     * @param string $sCharset
+     *
+     * @return void
+     */
+    public function setCharset($sCharset)
+    {
+        $this->sCharset = $sCharset;
+    }
+
+    /**
+     * @return string
+     */
+    public function getCharset()
+    {
+        return $this->sCharset;
+    }
+
+    /**
+     * @return string
+     */
+    public function __toString()
+    {
+        return $this->render(new OutputFormat());
+    }
+
+    /**
+     * @return string
+     */
+    public function render(OutputFormat $oOutputFormat)
+    {
+        return "@charset {$this->sCharset->render($oOutputFormat)};";
+    }
+
+    /**
+     * @return string
+     */
+    public function atRuleName()
+    {
+        return 'charset';
+    }
+
+    /**
+     * @return string
+     */
+    public function atRuleArgs()
+    {
+        return $this->sCharset;
+    }
+
+    /**
+     * @param array<array-key, Comment> $aComments
+     *
+     * @return void
+     */
+    public function addComments(array $aComments)
+    {
+        $this->aComments = array_merge($this->aComments, $aComments);
+    }
+
+    /**
+     * @return array<array-key, Comment>
+     */
+    public function getComments()
+    {
+        return $this->aComments;
+    }
+
+    /**
+     * @param array<array-key, Comment> $aComments
+     *
+     * @return void
+     */
+    public function setComments(array $aComments)
+    {
+        $this->aComments = $aComments;
+    }
+}

vendor/sabberworm/php-css-parser/src/Property/Import.php

@@ -0,0 +1,137 @@
+<?php
+
+namespace Sabberworm\CSS\Property;
+
+use Sabberworm\CSS\Comment\Comment;
+use Sabberworm\CSS\OutputFormat;
+use Sabberworm\CSS\Value\URL;
+
+/**
+ * Class representing an `@import` rule.
+ */
+class Import implements AtRule
+{
+    /**
+     * @var URL
+     */
+    private $oLocation;
+
+    /**
+     * @var string
+     */
+    private $sMediaQuery;
+
+    /**
+     * @var int
+     */
+    protected $iLineNo;
+
+    /**
+     * @var array<array-key, Comment>
+     */
+    protected $aComments;
+
+    /**
+     * @param URL $oLocation
+     * @param string $sMediaQuery
+     * @param int $iLineNo
+     */
+    public function __construct(URL $oLocation, $sMediaQuery, $iLineNo = 0)
+    {
+        $this->oLocation = $oLocation;
+        $this->sMediaQuery = $sMediaQuery;
+        $this->iLineNo = $iLineNo;
+        $this->aComments = [];
+    }
+
+    /**
+     * @return int
+     */
+    public function getLineNo()
+    {
+        return $this->iLineNo;
+    }
+
+    /**
+     * @param URL $oLocation
+     *
+     * @return void
+     */
+    public function setLocation($oLocation)
+    {
+        $this->oLocation = $oLocation;
+    }
+
+    /**
+     * @return URL
+     */
+    public function getLocation()
+    {
+        return $this->oLocation;
+    }
+
+    /**
+     * @return string
+     */
+    public function __toString()
+    {
+        return $this->render(new OutputFormat());
+    }
+
+    /**
+     * @return string
+     */
+    public function render(OutputFormat $oOutputFormat)
+    {
+        return "@import " . $this->oLocation->render($oOutputFormat)
+            . ($this->sMediaQuery === null ? '' : ' ' . $this->sMediaQuery) . ';';
+    }
+
+    /**
+     * @return string
+     */
+    public function atRuleName()
+    {
+        return 'import';
+    }
+
+    /**
+     * @return array<int, URL|string>
+     */
+    public function atRuleArgs()
+    {
+        $aResult = [$this->oLocation];
+        if ($this->sMediaQuery) {
+            array_push($aResult, $this->sMediaQuery);
+        }
+        return $aResult;
+    }
+
+    /**
+     * @param array<array-key, Comment> $aComments
+     *
+     * @return void
+     */
+    public function addComments(array $aComments)
+    {
+        $this->aComments = array_merge($this->aComments, $aComments);
+    }
+
+    /**
+     * @return array<array-key, Comment>
+     */
+    public function getComments()
+    {
+        return $this->aComments;
+    }
+
+    /**
+     * @param array<array-key, Comment> $aComments
+     *
+     * @return void
+     */
+    public function setComments(array $aComments)
+    {
+        $this->aComments = $aComments;
+    }
+}

vendor/sabberworm/php-css-parser/src/Property/KeyframeSelector.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace Sabberworm\CSS\Property;
+
+class KeyframeSelector extends Selector
+{
+    /**
+     * regexp for specificity calculations
+     *
+     * @var string
+     */
+    const SELECTOR_VALIDATION_RX = '/
+    ^(
+        (?:
+            [a-zA-Z0-9\x{00A0}-\x{FFFF}_^$|*="\'~\[\]()\-\s\.:#+>]* # any sequence of valid unescaped characters
+            (?:\\\\.)?                                              # a single escaped character
+            (?:([\'"]).*?(?<!\\\\)\2)?                              # a quoted text like [id="example"]
+        )*
+    )|
+    (\d+%)                                                          # keyframe animation progress percentage (e.g. 50%)
+    $
+    /ux';
+}

vendor/sabberworm/php-css-parser/src/Property/Selector.php

@@ -0,0 +1,138 @@
+<?php
+
+namespace Sabberworm\CSS\Property;
+
+/**
+ * Class representing a single CSS selector. Selectors have to be split by the comma prior to being passed into this
+ * class.
+ */
+class Selector
+{
+    /**
+     * regexp for specificity calculations
+     *
+     * @var string
+     */
+    const NON_ID_ATTRIBUTES_AND_PSEUDO_CLASSES_RX = '/
+        (\.[\w]+)                   # classes
+        |
+        \[(\w+)                     # attributes
+        |
+        (\:(                        # pseudo classes
+            link|visited|active
+            |hover|focus
+            |lang
+            |target
+            |enabled|disabled|checked|indeterminate
+            |root
+            |nth-child|nth-last-child|nth-of-type|nth-last-of-type
+            |first-child|last-child|first-of-type|last-of-type
+            |only-child|only-of-type
+            |empty|contains
+        ))
+        /ix';
+
+    /**
+     * regexp for specificity calculations
+     *
+     * @var string
+     */
+    const ELEMENTS_AND_PSEUDO_ELEMENTS_RX = '/
+        ((^|[\s\+\>\~]+)[\w]+   # elements
+        |
+        \:{1,2}(                # pseudo-elements
+            after|before|first-letter|first-line|selection
+        ))
+        /ix';
+
+    /**
+     * regexp for specificity calculations
+     *
+     * @var string
+     */
+    const SELECTOR_VALIDATION_RX = '/
+        ^(
+            (?:
+                [a-zA-Z0-9\x{00A0}-\x{FFFF}_^$|*="\'~\[\]()\-\s\.:#+>]* # any sequence of valid unescaped characters
+                (?:\\\\.)?                                              # a single escaped character
+                (?:([\'"]).*?(?<!\\\\)\2)?                              # a quoted text like [id="example"]
+            )*
+        )$
+        /ux';
+
+    /**
+     * @var string
+     */
+    private $sSelector;
+
+    /**
+     * @var int|null
+     */
+    private $iSpecificity;
+
+    /**
+     * @param string $sSelector
+     *
+     * @return bool
+     */
+    public static function isValid($sSelector)
+    {
+        return preg_match(static::SELECTOR_VALIDATION_RX, $sSelector);
+    }
+
+    /**
+     * @param string $sSelector
+     * @param bool $bCalculateSpecificity
+     */
+    public function __construct($sSelector, $bCalculateSpecificity = false)
+    {
+        $this->setSelector($sSelector);
+        if ($bCalculateSpecificity) {
+            $this->getSpecificity();
+        }
+    }
+
+    /**
+     * @return string
+     */
+    public function getSelector()
+    {
+        return $this->sSelector;
+    }
+
+    /**
+     * @param string $sSelector
+     *
+     * @return void
+     */
+    public function setSelector($sSelector)
+    {
+        $this->sSelector = trim($sSelector);
+        $this->iSpecificity = null;
+    }
+
+    /**
+     * @return string
+     */
+    public function __toString()
+    {
+        return $this->getSelector();
+    }
+
+    /**
+     * @return int
+     */
+    public function getSpecificity()
+    {
+        if ($this->iSpecificity === null) {
+            $a = 0;
+            /// @todo should exclude \# as well as "#"
+            $aMatches = null;
+            $b = substr_count($this->sSelector, '#');
+            $c = preg_match_all(self::NON_ID_ATTRIBUTES_AND_PSEUDO_CLASSES_RX, $this->sSelector, $aMatches);
+            $d = preg_match_all(self::ELEMENTS_AND_PSEUDO_ELEMENTS_RX, $this->sSelector, $aMatches);
+            $this->iSpecificity = ($a * 1000) + ($b * 100) + ($c * 10) + $d;
+        }
+        return $this->iSpecificity;
+    }
+}

vendor/sabberworm/php-css-parser/src/Renderable.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace Sabberworm\CSS;
+
+interface Renderable
+{
+    /**
+     * @return string
+     */
+    public function __toString();
+
+    /**
+     * @return string
+     */
+    public function render(OutputFormat $oOutputFormat);
+
+    /**
+     * @return int
+     */
+    public function getLineNo();
+}

vendor/sabberworm/php-css-parser/src/Rule/Rule.php

@@ -0,0 +1,392 @@
+<?php
+
+namespace Sabberworm\CSS\Rule;
+
+use Sabberworm\CSS\Comment\Comment;
+use Sabberworm\CSS\Comment\Commentable;
+use Sabberworm\CSS\OutputFormat;
+use Sabberworm\CSS\Parsing\ParserState;
+use Sabberworm\CSS\Parsing\UnexpectedEOFException;
+use Sabberworm\CSS\Parsing\UnexpectedTokenException;
+use Sabberworm\CSS\Renderable;
+use Sabberworm\CSS\Value\RuleValueList;
+use Sabberworm\CSS\Value\Value;
+
+/**
+ * RuleSets contains Rule objects which always have a key and a value.
+ * In CSS, Rules are expressed as follows: “key: value[0][0] value[0][1], value[1][0] value[1][1];”
+ */
+class Rule implements Renderable, Commentable
+{
+    /**
+     * @var string
+     */
+    private $sRule;
+
+    /**
+     * @var RuleValueList|null
+     */
+    private $mValue;
+
+    /**
+     * @var bool
+     */
+    private $bIsImportant;
+
+    /**
+     * @var array<int, int>
+     */
+    private $aIeHack;
+
+    /**
+     * @var int
+     */
+    protected $iLineNo;
+
+    /**
+     * @var int
+     */
+    protected $iColNo;
+
+    /**
+     * @var array<array-key, Comment>
+     */
+    protected $aComments;
+
+    /**
+     * @param string $sRule
+     * @param int $iLineNo
+     * @param int $iColNo
+     */
+    public function __construct($sRule, $iLineNo = 0, $iColNo = 0)
+    {
+        $this->sRule = $sRule;
+        $this->mValue = null;
+        $this->bIsImportant = false;
+        $this->aIeHack = [];
+        $this->iLineNo = $iLineNo;
+        $this->iColNo = $iColNo;
+        $this->aComments = [];
+    }
+
+    /**
+     * @return Rule
+     *
+     * @throws UnexpectedEOFException
+     * @throws UnexpectedTokenException
+     */
+    public static function parse(ParserState $oParserState)
+    {
+        $aComments = $oParserState->consumeWhiteSpace();
+        $oRule = new Rule(
+            $oParserState->parseIdentifier(!$oParserState->comes("--")),
+            $oParserState->currentLine(),
+            $oParserState->currentColumn()
+        );
+        $oRule->setComments($aComments);
+        $oRule->addComments($oParserState->consumeWhiteSpace());
+        $oParserState->consume(':');
+        $oValue = Value::parseValue($oParserState, self::listDelimiterForRule($oRule->getRule()));
+        $oRule->setValue($oValue);
+        if ($oParserState->getSettings()->bLenientParsing) {
+            while ($oParserState->comes('\\')) {
+                $oParserState->consume('\\');
+                $oRule->addIeHack($oParserState->consume());
+                $oParserState->consumeWhiteSpace();
+            }
+        }
+        $oParserState->consumeWhiteSpace();
+        if ($oParserState->comes('!')) {
+            $oParserState->consume('!');
+            $oParserState->consumeWhiteSpace();
+            $oParserState->consume('important');
+            $oRule->setIsImportant(true);
+        }
+        $oParserState->consumeWhiteSpace();
+        while ($oParserState->comes(';')) {
+            $oParserState->consume(';');
+        }
+        $oParserState->consumeWhiteSpace();
+
+        return $oRule;
+    }
+
+    /**
+     * @param string $sRule
+     *
+     * @return array<int, string>
+     */
+    private static function listDelimiterForRule($sRule)
+    {
+        if (preg_match('/^font($|-)/', $sRule)) {
+            return [',', '/', ' '];
+        }
+        return [',', ' ', '/'];
+    }
+
+    /**
+     * @return int
+     */
+    public function getLineNo()
+    {
+        return $this->iLineNo;
+    }
+
+    /**
+     * @return int
+     */
+    public function getColNo()
+    {
+        return $this->iColNo;
+    }
+
+    /**
+     * @param int $iLine
+     * @param int $iColumn
+     *
+     * @return void
+     */
+    public function setPosition($iLine, $iColumn)
+    {
+        $this->iColNo = $iColumn;
+        $this->iLineNo = $iLine;
+    }
+
+    /**
+     * @param string $sRule
+     *
+     * @return void
+     */
+    public function setRule($sRule)
+    {
+        $this->sRule = $sRule;
+    }
+
+    /**
+     * @return string
+     */
+    public function getRule()
+    {
+        return $this->sRule;
+    }
+
+    /**
+     * @return RuleValueList|null
+     */
+    public function getValue()
+    {
+        return $this->mValue;
+    }
+
+    /**
+     * @param RuleValueList|null $mValue
+     *
+     * @return void
+     */
+    public function setValue($mValue)
+    {
+        $this->mValue = $mValue;
+    }
+
+    /**
+     * @param array<array-key, array<array-key, RuleValueList>> $aSpaceSeparatedValues
+     *
+     * @return RuleValueList
+     *
+     * @deprecated will be removed in version 9.0
+     *             Old-Style 2-dimensional array given. Retained for (some) backwards-compatibility.
+     *             Use `setValue()` instead and wrap the value inside a RuleValueList if necessary.
+     */
+    public function setValues(array $aSpaceSeparatedValues)
+    {
+        $oSpaceSeparatedList = null;
+        if (count($aSpaceSeparatedValues) > 1) {
+            $oSpaceSeparatedList = new RuleValueList(' ', $this->iLineNo);
+        }
+        foreach ($aSpaceSeparatedValues as $aCommaSeparatedValues) {
+            $oCommaSeparatedList = null;
+            if (count($aCommaSeparatedValues) > 1) {
+                $oCommaSeparatedList = new RuleValueList(',', $this->iLineNo);
+            }
+            foreach ($aCommaSeparatedValues as $mValue) {
+                if (!$oSpaceSeparatedList && !$oCommaSeparatedList) {
+                    $this->mValue = $mValue;
+                    return $mValue;
+                }
+                if ($oCommaSeparatedList) {
+                    $oCommaSeparatedList->addListComponent($mValue);
+                } else {
+                    $oSpaceSeparatedList->addListComponent($mValue);
+                }
+            }
+            if (!$oSpaceSeparatedList) {
+                $this->mValue = $oCommaSeparatedList;
+                return $oCommaSeparatedList;
+            } else {
+                $oSpaceSeparatedList->addListComponent($oCommaSeparatedList);
+            }
+        }
+        $this->mValue = $oSpaceSeparatedList;
+        return $oSpaceSeparatedList;
+    }
+
+    /**
+     * @return array<int, array<int, RuleValueList>>
+     *
+     * @deprecated will be removed in version 9.0
+     *             Old-Style 2-dimensional array returned. Retained for (some) backwards-compatibility.
+     *             Use `getValue()` instead and check for the existence of a (nested set of) ValueList object(s).
+     */
+    public function getValues()
+    {
+        if (!$this->mValue instanceof RuleValueList) {
+            return [[$this->mValue]];
+        }
+        if ($this->mValue->getListSeparator() === ',') {
+            return [$this->mValue->getListComponents()];
+        }
+        $aResult = [];
+        foreach ($this->mValue->getListComponents() as $mValue) {
+            if (!$mValue instanceof RuleValueList || $mValue->getListSeparator() !== ',') {
+                $aResult[] = [$mValue];
+                continue;
+            }
+            if ($this->mValue->getListSeparator() === ' ' || count($aResult) === 0) {
+                $aResult[] = [];
+            }
+            foreach ($mValue->getListComponents() as $mValue) {
+                $aResult[count($aResult) - 1][] = $mValue;
+            }
+        }
+        return $aResult;
+    }
+
+    /**
+     * Adds a value to the existing value. Value will be appended if a `RuleValueList` exists of the given type.
+     * Otherwise, the existing value will be wrapped by one.
+     *
+     * @param RuleValueList|array<int, RuleValueList> $mValue
+     * @param string $sType
+     *
+     * @return void
+     */
+    public function addValue($mValue, $sType = ' ')
+    {
+        if (!is_array($mValue)) {
+            $mValue = [$mValue];
+        }
+        if (!$this->mValue instanceof RuleValueList || $this->mValue->getListSeparator() !== $sType) {
+            $mCurrentValue = $this->mValue;
+            $this->mValue = new RuleValueList($sType, $this->iLineNo);
+            if ($mCurrentValue) {
+                $this->mValue->addListComponent($mCurrentValue);
+            }
+        }
+        foreach ($mValue as $mValueItem) {
+            $this->mValue->addListComponent($mValueItem);
+        }
+    }
+
+    /**
+     * @param int $iModifier
+     *
+     * @return void
+     */
+    public function addIeHack($iModifier)
+    {
+        $this->aIeHack[] = $iModifier;
+    }
+
+    /**
+     * @param array<int, int> $aModifiers
+     *
+     * @return void
+     */
+    public function setIeHack(array $aModifiers)
+    {
+        $this->aIeHack = $aModifiers;
+    }
+
+    /**
+     * @return array<int, int>
+     */
+    public function getIeHack()
+    {
+        return $this->aIeHack;
+    }
+
+    /**
+     * @param bool $bIsImportant
+     *
+     * @return void
+     */
+    public function setIsImportant($bIsImportant)
+    {
+        $this->bIsImportant = $bIsImportant;
+    }
+
+    /**
+     * @return bool
+     */
+    public function getIsImportant()
+    {
+        return $this->bIsImportant;
+    }
+
+    /**
+     * @return string
+     */
+    public function __toString()
+    {
+        return $this->render(new OutputFormat());
+    }
+
+    /**
+     * @return string
+     */
+    public function render(OutputFormat $oOutputFormat)
+    {
+        $sResult = "{$this->sRule}:{$oOutputFormat->spaceAfterRuleName()}";
+        if ($this->mValue instanceof Value) { //Can also be a ValueList
+            $sResult .= $this->mValue->render($oOutputFormat);
+        } else {
+            $sResult .= $this->mValue;
+        }
+        if (!empty($this->aIeHack)) {
+            $sResult .= ' \\' . implode('\\', $this->aIeHack);
+        }
+        if ($this->bIsImportant) {
+            $sResult .= ' !important';
+        }
+        $sResult .= ';';
+        return $sResult;
+    }
+
+    /**
+     * @param array<array-key, Comment> $aComments
+     *
+     * @return void
+     */
+    public function addComments(array $aComments)
+    {
+        $this->aComments = array_merge($this->aComments, $aComments);
+    }
+
+    /**
+     * @return array<array-key, Comment>
+     */
+    public function getComments()
+    {
+        return $this->aComments;
+    }
+
+    /**
+     * @param array<array-key, Comment> $aComments
+     *
+     * @return void
+     */
+    public function setComments(array $aComments)
+    {
+        $this->aComments = $aComments;
+    }
+}

vendor/sabberworm/php-css-parser/src/RuleSet/AtRuleSet.php

@@ -0,0 +1,73 @@
+<?php
+
+namespace Sabberworm\CSS\RuleSet;
+
+use Sabberworm\CSS\OutputFormat;
+use Sabberworm\CSS\Property\AtRule;
+
+/**
+ * A RuleSet constructed by an unknown at-rule. `@font-face` rules are rendered into AtRuleSet objects.
+ */
+class AtRuleSet extends RuleSet implements AtRule
+{
+    /**
+     * @var string
+     */
+    private $sType;
+
+    /**
+     * @var string
+     */
+    private $sArgs;
+
+    /**
+     * @param string $sType
+     * @param string $sArgs
+     * @param int $iLineNo
+     */
+    public function __construct($sType, $sArgs = '', $iLineNo = 0)
+    {
+        parent::__construct($iLineNo);
+        $this->sType = $sType;
+        $this->sArgs = $sArgs;
+    }
+
+    /**
+     * @return string
+     */
+    public function atRuleName()
+    {
+        return $this->sType;
+    }
+
+    /**
+     * @return string
+     */
+    public function atRuleArgs()
+    {
+        return $this->sArgs;
+    }
+
+    /**
+     * @return string
+     */
+    public function __toString()
+    {
+        return $this->render(new OutputFormat());
+    }
+
+    /**
+     * @return string
+     */
+    public function render(OutputFormat $oOutputFormat)
+    {
+        $sArgs = $this->sArgs;
+        if ($sArgs) {
+            $sArgs = ' ' . $sArgs;
+        }
+        $sResult = "@{$this->sType}$sArgs{$oOutputFormat->spaceBeforeOpeningBrace()}{";
+        $sResult .= parent::render($oOutputFormat);
+        $sResult .= '}';
+        return $sResult;
+    }
+}

vendor/sabberworm/php-css-parser/src/RuleSet/DeclarationBlock.php

@@ -0,0 +1,831 @@
+<?php
+
+namespace Sabberworm\CSS\RuleSet;
+
+use Sabberworm\CSS\CSSList\CSSList;
+use Sabberworm\CSS\CSSList\KeyFrame;
+use Sabberworm\CSS\OutputFormat;
+use Sabberworm\CSS\Parsing\OutputException;
+use Sabberworm\CSS\Parsing\ParserState;
+use Sabberworm\CSS\Parsing\UnexpectedEOFException;
+use Sabberworm\CSS\Parsing\UnexpectedTokenException;
+use Sabberworm\CSS\Property\KeyframeSelector;
+use Sabberworm\CSS\Property\Selector;
+use Sabberworm\CSS\Rule\Rule;
+use Sabberworm\CSS\Value\Color;
+use Sabberworm\CSS\Value\RuleValueList;
+use Sabberworm\CSS\Value\Size;
+use Sabberworm\CSS\Value\URL;
+use Sabberworm\CSS\Value\Value;
+
+/**
+ * Declaration blocks are the parts of a CSS file which denote the rules belonging to a selector.
+ *
+ * Declaration blocks usually appear directly inside a `Document` or another `CSSList` (mostly a `MediaQuery`).
+ */
+class DeclarationBlock extends RuleSet
+{
+    /**
+     * @var array<int, Selector|string>
+     */
+    private $aSelectors;
+
+    /**
+     * @param int $iLineNo
+     */
+    public function __construct($iLineNo = 0)
+    {
+        parent::__construct($iLineNo);
+        $this->aSelectors = [];
+    }
+
+    /**
+     * @param CSSList|null $oList
+     *
+     * @return DeclarationBlock|false
+     *
+     * @throws UnexpectedTokenException
+     * @throws UnexpectedEOFException
+     */
+    public static function parse(ParserState $oParserState, $oList = null)
+    {
+        $aComments = [];
+        $oResult = new DeclarationBlock($oParserState->currentLine());
+        try {
+            $aSelectorParts = [];
+            $sStringWrapperChar = false;
+            do {
+                $aSelectorParts[] = $oParserState->consume(1)
+                    . $oParserState->consumeUntil(['{', '}', '\'', '"'], false, false, $aComments);
+                if (in_array($oParserState->peek(), ['\'', '"']) && substr(end($aSelectorParts), -1) != "\\") {
+                    if ($sStringWrapperChar === false) {
+                        $sStringWrapperChar = $oParserState->peek();
+                    } elseif ($sStringWrapperChar == $oParserState->peek()) {
+                        $sStringWrapperChar = false;
+                    }
+                }
+            } while (!in_array($oParserState->peek(), ['{', '}']) || $sStringWrapperChar !== false);
+            $oResult->setSelectors(implode('', $aSelectorParts), $oList);
+            if ($oParserState->comes('{')) {
+                $oParserState->consume(1);
+            }
+        } catch (UnexpectedTokenException $e) {
+            if ($oParserState->getSettings()->bLenientParsing) {
+                if (!$oParserState->comes('}')) {
+                    $oParserState->consumeUntil('}', false, true);
+                }
+                return false;
+            } else {
+                throw $e;
+            }
+        }
+        $oResult->setComments($aComments);
+        RuleSet::parseRuleSet($oParserState, $oResult);
+        return $oResult;
+    }
+
+    /**
+     * @param array<int, Selector|string>|string $mSelector
+     * @param CSSList|null $oList
+     *
+     * @throws UnexpectedTokenException
+     */
+    public function setSelectors($mSelector, $oList = null)
+    {
+        if (is_array($mSelector)) {
+            $this->aSelectors = $mSelector;
+        } else {
+            $this->aSelectors = explode(',', $mSelector);
+        }
+        foreach ($this->aSelectors as $iKey => $mSelector) {
+            if (!($mSelector instanceof Selector)) {
+                if ($oList === null || !($oList instanceof KeyFrame)) {
+                    if (!Selector::isValid($mSelector)) {
+                        throw new UnexpectedTokenException(
+                            "Selector did not match '" . Selector::SELECTOR_VALIDATION_RX . "'.",
+                            $mSelector,
+                            "custom"
+                        );
+                    }
+                    $this->aSelectors[$iKey] = new Selector($mSelector);
+                } else {
+                    if (!KeyframeSelector::isValid($mSelector)) {
+                        throw new UnexpectedTokenException(
+                            "Selector did not match '" . KeyframeSelector::SELECTOR_VALIDATION_RX . "'.",
+                            $mSelector,
+                            "custom"
+                        );
+                    }
+                    $this->aSelectors[$iKey] = new KeyframeSelector($mSelector);
+                }
+            }
+        }
+    }
+
+    /**
+     * Remove one of the selectors of the block.
+     *
+     * @param Selector|string $mSelector
+     *
+     * @return bool
+     */
+    public function removeSelector($mSelector)
+    {
+        if ($mSelector instanceof Selector) {
+            $mSelector = $mSelector->getSelector();
+        }
+        foreach ($this->aSelectors as $iKey => $oSelector) {
+            if ($oSelector->getSelector() === $mSelector) {
+                unset($this->aSelectors[$iKey]);
+                return true;
+            }
+        }
+        return false;
+    }
+
+    /**
+     * @return array<int, Selector|string>
+     *
+     * @deprecated will be removed in version 9.0; use `getSelectors()` instead
+     */
+    public function getSelector()
+    {
+        return $this->getSelectors();
+    }
+
+    /**
+     * @param Selector|string $mSelector
+     * @param CSSList|null $oList
+     *
+     * @return void
+     *
+     * @deprecated will be removed in version 9.0; use `setSelectors()` instead
+     */
+    public function setSelector($mSelector, $oList = null)
+    {
+        $this->setSelectors($mSelector, $oList);
+    }
+
+    /**
+     * @return array<int, Selector|string>
+     */
+    public function getSelectors()
+    {
+        return $this->aSelectors;
+    }
+
+    /**
+     * Splits shorthand declarations (e.g. `margin` or `font`) into their constituent parts.
+     *
+     * @return void
+     */
+    public function expandShorthands()
+    {
+        // border must be expanded before dimensions
+        $this->expandBorderShorthand();
+        $this->expandDimensionsShorthand();
+        $this->expandFontShorthand();
+        $this->expandBackgroundShorthand();
+        $this->expandListStyleShorthand();
+    }
+
+    /**
+     * Creates shorthand declarations (e.g. `margin` or `font`) whenever possible.
+     *
+     * @return void
+     */
+    public function createShorthands()
+    {
+        $this->createBackgroundShorthand();
+        $this->createDimensionsShorthand();
+        // border must be shortened after dimensions
+        $this->createBorderShorthand();
+        $this->createFontShorthand();
+        $this->createListStyleShorthand();
+    }
+
+    /**
+     * Splits shorthand border declarations (e.g. `border: 1px red;`).
+     *
+     * Additional splitting happens in expandDimensionsShorthand.
+     *
+     * Multiple borders are not yet supported as of 3.
+     *
+     * @return void
+     */
+    public function expandBorderShorthand()
+    {
+        $aBorderRules = [
+            'border',
+            'border-left',
+            'border-right',
+            'border-top',
+            'border-bottom',
+        ];
+        $aBorderSizes = [
+            'thin',
+            'medium',
+            'thick',
+        ];
+        $aRules = $this->getRulesAssoc();
+        foreach ($aBorderRules as $sBorderRule) {
+            if (!isset($aRules[$sBorderRule])) {
+                continue;
+            }
+            $oRule = $aRules[$sBorderRule];
+            $mRuleValue = $oRule->getValue();
+            $aValues = [];
+            if (!$mRuleValue instanceof RuleValueList) {
+                $aValues[] = $mRuleValue;
+            } else {
+                $aValues = $mRuleValue->getListComponents();
+            }
+            foreach ($aValues as $mValue) {
+                if ($mValue instanceof Value) {
+                    $mNewValue = clone $mValue;
+                } else {
+                    $mNewValue = $mValue;
+                }
+                if ($mValue instanceof Size) {
+                    $sNewRuleName = $sBorderRule . "-width";
+                } elseif ($mValue instanceof Color) {
+                    $sNewRuleName = $sBorderRule . "-color";
+                } else {
+                    if (in_array($mValue, $aBorderSizes)) {
+                        $sNewRuleName = $sBorderRule . "-width";
+                    } else {
+                        $sNewRuleName = $sBorderRule . "-style";
+                    }
+                }
+                $oNewRule = new Rule($sNewRuleName, $oRule->getLineNo(), $oRule->getColNo());
+                $oNewRule->setIsImportant($oRule->getIsImportant());
+                $oNewRule->addValue([$mNewValue]);
+                $this->addRule($oNewRule);
+            }
+            $this->removeRule($sBorderRule);
+        }
+    }
+
+    /**
+     * Splits shorthand dimensional declarations (e.g. `margin: 0px auto;`)
+     * into their constituent parts.
+     *
+     * Handles `margin`, `padding`, `border-color`, `border-style` and `border-width`.
+     *
+     * @return void
+     */
+    public function expandDimensionsShorthand()
+    {
+        $aExpansions = [
+            'margin' => 'margin-%s',
+            'padding' => 'padding-%s',
+            'border-color' => 'border-%s-color',
+            'border-style' => 'border-%s-style',
+            'border-width' => 'border-%s-width',
+        ];
+        $aRules = $this->getRulesAssoc();
+        foreach ($aExpansions as $sProperty => $sExpanded) {
+            if (!isset($aRules[$sProperty])) {
+                continue;
+            }
+            $oRule = $aRules[$sProperty];
+            $mRuleValue = $oRule->getValue();
+            $aValues = [];
+            if (!$mRuleValue instanceof RuleValueList) {
+                $aValues[] = $mRuleValue;
+            } else {
+                $aValues = $mRuleValue->getListComponents();
+            }
+            $top = $right = $bottom = $left = null;
+            switch (count($aValues)) {
+                case 1:
+                    $top = $right = $bottom = $left = $aValues[0];
+                    break;
+                case 2:
+                    $top = $bottom = $aValues[0];
+                    $left = $right = $aValues[1];
+                    break;
+                case 3:
+                    $top = $aValues[0];
+                    $left = $right = $aValues[1];
+                    $bottom = $aValues[2];
+                    break;
+                case 4:
+                    $top = $aValues[0];
+                    $right = $aValues[1];
+                    $bottom = $aValues[2];
+                    $left = $aValues[3];
+                    break;
+            }
+            foreach (['top', 'right', 'bottom', 'left'] as $sPosition) {
+                $oNewRule = new Rule(sprintf($sExpanded, $sPosition), $oRule->getLineNo(), $oRule->getColNo());
+                $oNewRule->setIsImportant($oRule->getIsImportant());
+                $oNewRule->addValue(${$sPosition});
+                $this->addRule($oNewRule);
+            }
+            $this->removeRule($sProperty);
+        }
+    }
+
+    /**
+     * Converts shorthand font declarations
+     * (e.g. `font: 300 italic 11px/14px verdana, helvetica, sans-serif;`)
+     * into their constituent parts.
+     *
+     * @return void
+     */
+    public function expandFontShorthand()
+    {
+        $aRules = $this->getRulesAssoc();
+        if (!isset($aRules['font'])) {
+            return;
+        }
+        $oRule = $aRules['font'];
+        // reset properties to 'normal' per http://www.w3.org/TR/21/fonts.html#font-shorthand
+        $aFontProperties = [
+            'font-style' => 'normal',
+            'font-variant' => 'normal',
+            'font-weight' => 'normal',
+            'font-size' => 'normal',
+            'line-height' => 'normal',
+        ];
+        $mRuleValue = $oRule->getValue();
+        $aValues = [];
+        if (!$mRuleValue instanceof RuleValueList) {
+            $aValues[] = $mRuleValue;
+        } else {
+            $aValues = $mRuleValue->getListComponents();
+        }
+        foreach ($aValues as $mValue) {
+            if (!$mValue instanceof Value) {
+                $mValue = mb_strtolower($mValue);
+            }
+            if (in_array($mValue, ['normal', 'inherit'])) {
+                foreach (['font-style', 'font-weight', 'font-variant'] as $sProperty) {
+                    if (!isset($aFontProperties[$sProperty])) {
+                        $aFontProperties[$sProperty] = $mValue;
+                    }
+                }
+            } elseif (in_array($mValue, ['italic', 'oblique'])) {
+                $aFontProperties['font-style'] = $mValue;
+            } elseif ($mValue == 'small-caps') {
+                $aFontProperties['font-variant'] = $mValue;
+            } elseif (
+                in_array($mValue, ['bold', 'bolder', 'lighter'])
+                || ($mValue instanceof Size
+                    && in_array($mValue->getSize(), range(100, 900, 100)))
+            ) {
+                $aFontProperties['font-weight'] = $mValue;
+            } elseif ($mValue instanceof RuleValueList && $mValue->getListSeparator() == '/') {
+                list($oSize, $oHeight) = $mValue->getListComponents();
+                $aFontProperties['font-size'] = $oSize;
+                $aFontProperties['line-height'] = $oHeight;
+            } elseif ($mValue instanceof Size && $mValue->getUnit() !== null) {
+                $aFontProperties['font-size'] = $mValue;
+            } else {
+                $aFontProperties['font-family'] = $mValue;
+            }
+        }
+        foreach ($aFontProperties as $sProperty => $mValue) {
+            $oNewRule = new Rule($sProperty, $oRule->getLineNo(), $oRule->getColNo());
+            $oNewRule->addValue($mValue);
+            $oNewRule->setIsImportant($oRule->getIsImportant());
+            $this->addRule($oNewRule);
+        }
+        $this->removeRule('font');
+    }
+
+    /**
+     * Converts shorthand background declarations
+     * (e.g. `background: url("chess.png") gray 50% repeat fixed;`)
+     * into their constituent parts.
+     *
+     * @see http://www.w3.org/TR/21/colors.html#propdef-background
+     *
+     * @return void
+     */
+    public function expandBackgroundShorthand()
+    {
+        $aRules = $this->getRulesAssoc();
+        if (!isset($aRules['background'])) {
+            return;
+        }
+        $oRule = $aRules['background'];
+        $aBgProperties = [
+            'background-color' => ['transparent'],
+            'background-image' => ['none'],
+            'background-repeat' => ['repeat'],
+            'background-attachment' => ['scroll'],
+            'background-position' => [
+                new Size(0, '%', null, false, $this->iLineNo),
+                new Size(0, '%', null, false, $this->iLineNo),
+            ],
+        ];
+        $mRuleValue = $oRule->getValue();
+        $aValues = [];
+        if (!$mRuleValue instanceof RuleValueList) {
+            $aValues[] = $mRuleValue;
+        } else {
+            $aValues = $mRuleValue->getListComponents();
+        }
+        if (count($aValues) == 1 && $aValues[0] == 'inherit') {
+            foreach ($aBgProperties as $sProperty => $mValue) {
+                $oNewRule = new Rule($sProperty, $oRule->getLineNo(), $oRule->getColNo());
+                $oNewRule->addValue('inherit');
+                $oNewRule->setIsImportant($oRule->getIsImportant());
+                $this->addRule($oNewRule);
+            }
+            $this->removeRule('background');
+            return;
+        }
+        $iNumBgPos = 0;
+        foreach ($aValues as $mValue) {
+            if (!$mValue instanceof Value) {
+                $mValue = mb_strtolower($mValue);
+            }
+            if ($mValue instanceof URL) {
+                $aBgProperties['background-image'] = $mValue;
+            } elseif ($mValue instanceof Color) {
+                $aBgProperties['background-color'] = $mValue;
+            } elseif (in_array($mValue, ['scroll', 'fixed'])) {
+                $aBgProperties['background-attachment'] = $mValue;
+            } elseif (in_array($mValue, ['repeat', 'no-repeat', 'repeat-x', 'repeat-y'])) {
+                $aBgProperties['background-repeat'] = $mValue;
+            } elseif (
+                in_array($mValue, ['left', 'center', 'right', 'top', 'bottom'])
+                || $mValue instanceof Size
+            ) {
+                if ($iNumBgPos == 0) {
+                    $aBgProperties['background-position'][0] = $mValue;
+                    $aBgProperties['background-position'][1] = 'center';
+                } else {
+                    $aBgProperties['background-position'][$iNumBgPos] = $mValue;
+                }
+                $iNumBgPos++;
+            }
+        }
+        foreach ($aBgProperties as $sProperty => $mValue) {
+            $oNewRule = new Rule($sProperty, $oRule->getLineNo(), $oRule->getColNo());
+            $oNewRule->setIsImportant($oRule->getIsImportant());
+            $oNewRule->addValue($mValue);
+            $this->addRule($oNewRule);
+        }
+        $this->removeRule('background');
+    }
+
+    /**
+     * @return void
+     */
+    public function expandListStyleShorthand()
+    {
+        $aListProperties = [
+            'list-style-type' => 'disc',
+            'list-style-position' => 'outside',
+            'list-style-image' => 'none',
+        ];
+        $aListStyleTypes = [
+            'none',
+            'disc',
+            'circle',
+            'square',
+            'decimal-leading-zero',
+            'decimal',
+            'lower-roman',
+            'upper-roman',
+            'lower-greek',
+            'lower-alpha',
+            'lower-latin',
+            'upper-alpha',
+            'upper-latin',
+            'hebrew',
+            'armenian',
+            'georgian',
+            'cjk-ideographic',
+            'hiragana',
+            'hira-gana-iroha',
+            'katakana-iroha',
+            'katakana',
+        ];
+        $aListStylePositions = [
+            'inside',
+            'outside',
+        ];
+        $aRules = $this->getRulesAssoc();
+        if (!isset($aRules['list-style'])) {
+            return;
+        }
+        $oRule = $aRules['list-style'];
+        $mRuleValue = $oRule->getValue();
+        $aValues = [];
+        if (!$mRuleValue instanceof RuleValueList) {
+            $aValues[] = $mRuleValue;
+        } else {
+            $aValues = $mRuleValue->getListComponents();
+        }
+        if (count($aValues) == 1 && $aValues[0] == 'inherit') {
+            foreach ($aListProperties as $sProperty => $mValue) {
+                $oNewRule = new Rule($sProperty, $oRule->getLineNo(), $oRule->getColNo());
+                $oNewRule->addValue('inherit');
+                $oNewRule->setIsImportant($oRule->getIsImportant());
+                $this->addRule($oNewRule);
+            }
+            $this->removeRule('list-style');
+            return;
+        }
+        foreach ($aValues as $mValue) {
+            if (!$mValue instanceof Value) {
+                $mValue = mb_strtolower($mValue);
+            }
+            if ($mValue instanceof Url) {
+                $aListProperties['list-style-image'] = $mValue;
+            } elseif (in_array($mValue, $aListStyleTypes)) {
+                $aListProperties['list-style-types'] = $mValue;
+            } elseif (in_array($mValue, $aListStylePositions)) {
+                $aListProperties['list-style-position'] = $mValue;
+            }
+        }
+        foreach ($aListProperties as $sProperty => $mValue) {
+            $oNewRule = new Rule($sProperty, $oRule->getLineNo(), $oRule->getColNo());
+            $oNewRule->setIsImportant($oRule->getIsImportant());
+            $oNewRule->addValue($mValue);
+            $this->addRule($oNewRule);
+        }
+        $this->removeRule('list-style');
+    }
+
+    /**
+     * @param array<array-key, string> $aProperties
+     * @param string $sShorthand
+     *
+     * @return void
+     */
+    public function createShorthandProperties(array $aProperties, $sShorthand)
+    {
+        $aRules = $this->getRulesAssoc();
+        $aNewValues = [];
+        foreach ($aProperties as $sProperty) {
+            if (!isset($aRules[$sProperty])) {
+                continue;
+            }
+            $oRule = $aRules[$sProperty];
+            if (!$oRule->getIsImportant()) {
+                $mRuleValue = $oRule->getValue();
+                $aValues = [];
+                if (!$mRuleValue instanceof RuleValueList) {
+                    $aValues[] = $mRuleValue;
+                } else {
+                    $aValues = $mRuleValue->getListComponents();
+                }
+                foreach ($aValues as $mValue) {
+                    $aNewValues[] = $mValue;
+                }
+                $this->removeRule($sProperty);
+            }
+        }
+        if (count($aNewValues)) {
+            $oNewRule = new Rule($sShorthand, $oRule->getLineNo(), $oRule->getColNo());
+            foreach ($aNewValues as $mValue) {
+                $oNewRule->addValue($mValue);
+            }
+            $this->addRule($oNewRule);
+        }
+    }
+
+    /**
+     * @return void
+     */
+    public function createBackgroundShorthand()
+    {
+        $aProperties = [
+            'background-color',
+            'background-image',
+            'background-repeat',
+            'background-position',
+            'background-attachment',
+        ];
+        $this->createShorthandProperties($aProperties, 'background');
+    }
+
+    /**
+     * @return void
+     */
+    public function createListStyleShorthand()
+    {
+        $aProperties = [
+            'list-style-type',
+            'list-style-position',
+            'list-style-image',
+        ];
+        $this->createShorthandProperties($aProperties, 'list-style');
+    }
+
+    /**
+     * Combines `border-color`, `border-style` and `border-width` into `border`.
+     *
+     * Should be run after `create_dimensions_shorthand`!
+     *
+     * @return void
+     */
+    public function createBorderShorthand()
+    {
+        $aProperties = [
+            'border-width',
+            'border-style',
+            'border-color',
+        ];
+        $this->createShorthandProperties($aProperties, 'border');
+    }
+
+    /**
+     * Looks for long format CSS dimensional properties
+     * (margin, padding, border-color, border-style and border-width)
+     * and converts them into shorthand CSS properties.
+     *
+     * @return void
+     */
+    public function createDimensionsShorthand()
+    {
+        $aPositions = ['top', 'right', 'bottom', 'left'];
+        $aExpansions = [
+            'margin' => 'margin-%s',
+            'padding' => 'padding-%s',
+            'border-color' => 'border-%s-color',
+            'border-style' => 'border-%s-style',
+            'border-width' => 'border-%s-width',
+        ];
+        $aRules = $this->getRulesAssoc();
+        foreach ($aExpansions as $sProperty => $sExpanded) {
+            $aFoldable = [];
+            foreach ($aRules as $sRuleName => $oRule) {
+                foreach ($aPositions as $sPosition) {
+                    if ($sRuleName == sprintf($sExpanded, $sPosition)) {
+                        $aFoldable[$sRuleName] = $oRule;
+                    }
+                }
+            }
+            // All four dimensions must be present
+            if (count($aFoldable) == 4) {
+                $aValues = [];
+                foreach ($aPositions as $sPosition) {
+                    $oRule = $aRules[sprintf($sExpanded, $sPosition)];
+                    $mRuleValue = $oRule->getValue();
+                    $aRuleValues = [];
+                    if (!$mRuleValue instanceof RuleValueList) {
+                        $aRuleValues[] = $mRuleValue;
+                    } else {
+                        $aRuleValues = $mRuleValue->getListComponents();
+                    }
+                    $aValues[$sPosition] = $aRuleValues;
+                }
+                $oNewRule = new Rule($sProperty, $oRule->getLineNo(), $oRule->getColNo());
+                if ((string)$aValues['left'][0] == (string)$aValues['right'][0]) {
+                    if ((string)$aValues['top'][0] == (string)$aValues['bottom'][0]) {
+                        if ((string)$aValues['top'][0] == (string)$aValues['left'][0]) {
+                            // All 4 sides are equal
+                            $oNewRule->addValue($aValues['top']);
+                        } else {
+                            // Top and bottom are equal, left and right are equal
+                            $oNewRule->addValue($aValues['top']);
+                            $oNewRule->addValue($aValues['left']);
+                        }
+                    } else {
+                        // Only left and right are equal
+                        $oNewRule->addValue($aValues['top']);
+                        $oNewRule->addValue($aValues['left']);
+                        $oNewRule->addValue($aValues['bottom']);
+                    }
+                } else {
+                    // No sides are equal
+                    $oNewRule->addValue($aValues['top']);
+                    $oNewRule->addValue($aValues['left']);
+                    $oNewRule->addValue($aValues['bottom']);
+                    $oNewRule->addValue($aValues['right']);
+                }
+                $this->addRule($oNewRule);
+                foreach ($aPositions as $sPosition) {
+                    $this->removeRule(sprintf($sExpanded, $sPosition));
+                }
+            }
+        }
+    }
+
+    /**
+     * Looks for long format CSS font properties (e.g. `font-weight`) and
+     * tries to convert them into a shorthand CSS `font` property.
+     *
+     * At least `font-size` AND `font-family` must be present in order to create a shorthand declaration.
+     *
+     * @return void
+     */
+    public function createFontShorthand()
+    {
+        $aFontProperties = [
+            'font-style',
+            'font-variant',
+            'font-weight',
+            'font-size',
+            'line-height',
+            'font-family',
+        ];
+        $aRules = $this->getRulesAssoc();
+        if (!isset($aRules['font-size']) || !isset($aRules['font-family'])) {
+            return;
+        }
+        $oOldRule = isset($aRules['font-size']) ? $aRules['font-size'] : $aRules['font-family'];
+        $oNewRule = new Rule('font', $oOldRule->getLineNo(), $oOldRule->getColNo());
+        unset($oOldRule);
+        foreach (['font-style', 'font-variant', 'font-weight'] as $sProperty) {
+            if (isset($aRules[$sProperty])) {
+                $oRule = $aRules[$sProperty];
+                $mRuleValue = $oRule->getValue();
+                $aValues = [];
+                if (!$mRuleValue instanceof RuleValueList) {
+                    $aValues[] = $mRuleValue;
+                } else {
+                    $aValues = $mRuleValue->getListComponents();
+                }
+                if ($aValues[0] !== 'normal') {
+                    $oNewRule->addValue($aValues[0]);
+                }
+            }
+        }
+        // Get the font-size value
+        $oRule = $aRules['font-size'];
+        $mRuleValue = $oRule->getValue();
+        $aFSValues = [];
+        if (!$mRuleValue instanceof RuleValueList) {
+            $aFSValues[] = $mRuleValue;
+        } else {
+            $aFSValues = $mRuleValue->getListComponents();
+        }
+        // But wait to know if we have line-height to add it
+        if (isset($aRules['line-height'])) {
+            $oRule = $aRules['line-height'];
+            $mRuleValue = $oRule->getValue();
+            $aLHValues = [];
+            if (!$mRuleValue instanceof RuleValueList) {
+                $aLHValues[] = $mRuleValue;
+            } else {
+                $aLHValues = $mRuleValue->getListComponents();
+            }
+            if ($aLHValues[0] !== 'normal') {
+                $val = new RuleValueList('/', $this->iLineNo);
+                $val->addListComponent($aFSValues[0]);
+                $val->addListComponent($aLHValues[0]);
+                $oNewRule->addValue($val);
+            }
+        } else {
+            $oNewRule->addValue($aFSValues[0]);
+        }
+        $oRule = $aRules['font-family'];
+        $mRuleValue = $oRule->getValue();
+        $aFFValues = [];
+        if (!$mRuleValue instanceof RuleValueList) {
+            $aFFValues[] = $mRuleValue;
+        } else {
+            $aFFValues = $mRuleValue->getListComponents();
+        }
+        $oFFValue = new RuleValueList(',', $this->iLineNo);
+        $oFFValue->setListComponents($aFFValues);
+        $oNewRule->addValue($oFFValue);
+
+        $this->addRule($oNewRule);
+        foreach ($aFontProperties as $sProperty) {
+            $this->removeRule($sProperty);
+        }
+    }
+
+    /**
+     * @return string
+     *
+     * @throws OutputException
+     */
+    public function __toString()
+    {
+        return $this->render(new OutputFormat());
+    }
+
+    /**
+     * @return string
+     *
+     * @throws OutputException
+     */
+    public function render(OutputFormat $oOutputFormat)
+    {
+        if (count($this->aSelectors) === 0) {
+            // If all the selectors have been removed, this declaration block becomes invalid
+            throw new OutputException("Attempt to print declaration block with missing selector", $this->iLineNo);
+        }
+        $sResult = $oOutputFormat->sBeforeDeclarationBlock;
+        $sResult .= $oOutputFormat->implode(
+            $oOutputFormat->spaceBeforeSelectorSeparator() . ',' . $oOutputFormat->spaceAfterSelectorSeparator(),
+            $this->aSelectors
+        );
+        $sResult .= $oOutputFormat->sAfterDeclarationBlockSelectors;
+        $sResult .= $oOutputFormat->spaceBeforeOpeningBrace() . '{';
+        $sResult .= parent::render($oOutputFormat);
+        $sResult .= '}';
+        $sResult .= $oOutputFormat->sAfterDeclarationBlock;
+        return $sResult;
+    }
+}

vendor/sabberworm/php-css-parser/src/RuleSet/RuleSet.php

@@ -0,0 +1,326 @@
+<?php
+
+namespace Sabberworm\CSS\RuleSet;
+
+use Sabberworm\CSS\Comment\Comment;
+use Sabberworm\CSS\Comment\Commentable;
+use Sabberworm\CSS\OutputFormat;
+use Sabberworm\CSS\Parsing\ParserState;
+use Sabberworm\CSS\Parsing\UnexpectedEOFException;
+use Sabberworm\CSS\Parsing\UnexpectedTokenException;
+use Sabberworm\CSS\Renderable;
+use Sabberworm\CSS\Rule\Rule;
+
+/**
+ * RuleSet is a generic superclass denoting rules. The typical example for rule sets are declaration block.
+ * However, unknown At-Rules (like `@font-face`) are also rule sets.
+ */
+abstract class RuleSet implements Renderable, Commentable
+{
+    /**
+     * @var array<string, Rule>
+     */
+    private $aRules;
+
+    /**
+     * @var int
+     */
+    protected $iLineNo;
+
+    /**
+     * @var array<array-key, Comment>
+     */
+    protected $aComments;
+
+    /**
+     * @param int $iLineNo
+     */
+    public function __construct($iLineNo = 0)
+    {
+        $this->aRules = [];
+        $this->iLineNo = $iLineNo;
+        $this->aComments = [];
+    }
+
+    /**
+     * @return void
+     *
+     * @throws UnexpectedTokenException
+     * @throws UnexpectedEOFException
+     */
+    public static function parseRuleSet(ParserState $oParserState, RuleSet $oRuleSet)
+    {
+        while ($oParserState->comes(';')) {
+            $oParserState->consume(';');
+        }
+        while (!$oParserState->comes('}')) {
+            $oRule = null;
+            if ($oParserState->getSettings()->bLenientParsing) {
+                try {
+                    $oRule = Rule::parse($oParserState);
+                } catch (UnexpectedTokenException $e) {
+                    try {
+                        $sConsume = $oParserState->consumeUntil(["\n", ";", '}'], true);
+                        // We need to “unfind” the matches to the end of the ruleSet as this will be matched later
+                        if ($oParserState->streql(substr($sConsume, -1), '}')) {
+                            $oParserState->backtrack(1);
+                        } else {
+                            while ($oParserState->comes(';')) {
+                                $oParserState->consume(';');
+                            }
+                        }
+                    } catch (UnexpectedTokenException $e) {
+                        // We’ve reached the end of the document. Just close the RuleSet.
+                        return;
+                    }
+                }
+            } else {
+                $oRule = Rule::parse($oParserState);
+            }
+            if ($oRule) {
+                $oRuleSet->addRule($oRule);
+            }
+        }
+        $oParserState->consume('}');
+    }
+
+    /**
+     * @return int
+     */
+    public function getLineNo()
+    {
+        return $this->iLineNo;
+    }
+
+    /**
+     * @param Rule|null $oSibling
+     *
+     * @return void
+     */
+    public function addRule(Rule $oRule, Rule $oSibling = null)
+    {
+        $sRule = $oRule->getRule();
+        if (!isset($this->aRules[$sRule])) {
+            $this->aRules[$sRule] = [];
+        }
+
+        $iPosition = count($this->aRules[$sRule]);
+
+        if ($oSibling !== null) {
+            $iSiblingPos = array_search($oSibling, $this->aRules[$sRule], true);
+            if ($iSiblingPos !== false) {
+                $iPosition = $iSiblingPos;
+                $oRule->setPosition($oSibling->getLineNo(), $oSibling->getColNo() - 1);
+            }
+        }
+        if ($oRule->getLineNo() === 0 && $oRule->getColNo() === 0) {
+            //this node is added manually, give it the next best line
+            $rules = $this->getRules();
+            $pos = count($rules);
+            if ($pos > 0) {
+                $last = $rules[$pos - 1];
+                $oRule->setPosition($last->getLineNo() + 1, 0);
+            }
+        }
+
+        array_splice($this->aRules[$sRule], $iPosition, 0, [$oRule]);
+    }
+
+    /**
+     * Returns all rules matching the given rule name
+     *
+     * @example $oRuleSet->getRules('font') // returns array(0 => $oRule, …) or array().
+     *
+     * @example $oRuleSet->getRules('font-')
+     *          //returns an array of all rules either beginning with font- or matching font.
+     *
+     * @param Rule|string|null $mRule
+     *        Pattern to search for. If null, returns all rules.
+     *        If the pattern ends with a dash, all rules starting with the pattern are returned
+     *        as well as one matching the pattern with the dash excluded.
+     *        Passing a Rule behaves like calling `getRules($mRule->getRule())`.
+     *
+     * @return array<int, Rule>
+     */
+    public function getRules($mRule = null)
+    {
+        if ($mRule instanceof Rule) {
+            $mRule = $mRule->getRule();
+        }
+        /** @var array<int, Rule> $aResult */
+        $aResult = [];
+        foreach ($this->aRules as $sName => $aRules) {
+            // Either no search rule is given or the search rule matches the found rule exactly
+            // or the search rule ends in “-” and the found rule starts with the search rule.
+            if (
+                !$mRule || $sName === $mRule
+                || (
+                    strrpos($mRule, '-') === strlen($mRule) - strlen('-')
+                    && (strpos($sName, $mRule) === 0 || $sName === substr($mRule, 0, -1))
+                )
+            ) {
+                $aResult = array_merge($aResult, $aRules);
+            }
+        }
+        usort($aResult, function (Rule $first, Rule $second) {
+            if ($first->getLineNo() === $second->getLineNo()) {
+                return $first->getColNo() - $second->getColNo();
+            }
+            return $first->getLineNo() - $second->getLineNo();
+        });
+        return $aResult;
+    }
+
+    /**
+     * Overrides all the rules of this set.
+     *
+     * @param array<array-key, Rule> $aRules The rules to override with.
+     *
+     * @return void
+     */
+    public function setRules(array $aRules)
+    {
+        $this->aRules = [];
+        foreach ($aRules as $rule) {
+            $this->addRule($rule);
+        }
+    }
+
+    /**
+     * Returns all rules matching the given pattern and returns them in an associative array with the rule’s name
+     * as keys. This method exists mainly for backwards-compatibility and is really only partially useful.
+     *
+     * Note: This method loses some information: Calling this (with an argument of `background-`) on a declaration block
+     * like `{ background-color: green; background-color; rgba(0, 127, 0, 0.7); }` will only yield an associative array
+     * containing the rgba-valued rule while `getRules()` would yield an indexed array containing both.
+     *
+     * @param Rule|string|null $mRule $mRule
+     *        Pattern to search for. If null, returns all rules. If the pattern ends with a dash,
+     *        all rules starting with the pattern are returned as well as one matching the pattern with the dash
+     *        excluded. Passing a Rule behaves like calling `getRules($mRule->getRule())`.
+     *
+     * @return array<string, Rule>
+     */
+    public function getRulesAssoc($mRule = null)
+    {
+        /** @var array<string, Rule> $aResult */
+        $aResult = [];
+        foreach ($this->getRules($mRule) as $oRule) {
+            $aResult[$oRule->getRule()] = $oRule;
+        }
+        return $aResult;
+    }
+
+    /**
+     * Removes a rule from this RuleSet. This accepts all the possible values that `getRules()` accepts.
+     *
+     * If given a Rule, it will only remove this particular rule (by identity).
+     * If given a name, it will remove all rules by that name.
+     *
+     * Note: this is different from pre-v.2.0 behaviour of PHP-CSS-Parser, where passing a Rule instance would
+     * remove all rules with the same name. To get the old behaviour, use `removeRule($oRule->getRule())`.
+     *
+     * @param Rule|string|null $mRule
+     *        pattern to remove. If $mRule is null, all rules are removed. If the pattern ends in a dash,
+     *        all rules starting with the pattern are removed as well as one matching the pattern with the dash
+     *        excluded. Passing a Rule behaves matches by identity.
+     *
+     * @return void
+     */
+    public function removeRule($mRule)
+    {
+        if ($mRule instanceof Rule) {
+            $sRule = $mRule->getRule();
+            if (!isset($this->aRules[$sRule])) {
+                return;
+            }
+            foreach ($this->aRules[$sRule] as $iKey => $oRule) {
+                if ($oRule === $mRule) {
+                    unset($this->aRules[$sRule][$iKey]);
+                }
+            }
+        } else {
+            foreach ($this->aRules as $sName => $aRules) {
+                // Either no search rule is given or the search rule matches the found rule exactly
+                // or the search rule ends in “-” and the found rule starts with the search rule or equals it
+                // (without the trailing dash).
+                if (
+                    !$mRule || $sName === $mRule
+                    || (strrpos($mRule, '-') === strlen($mRule) - strlen('-')
+                        && (strpos($sName, $mRule) === 0 || $sName === substr($mRule, 0, -1)))
+                ) {
+                    unset($this->aRules[$sName]);
+                }
+            }
+        }
+    }
+
+    /**
+     * @return string
+     */
+    public function __toString()
+    {
+        return $this->render(new OutputFormat());
+    }
+
+    /**
+     * @return string
+     */
+    public function render(OutputFormat $oOutputFormat)
+    {
+        $sResult = '';
+        $bIsFirst = true;
+        foreach ($this->aRules as $aRules) {
+            foreach ($aRules as $oRule) {
+                $sRendered = $oOutputFormat->safely(function () use ($oRule, $oOutputFormat) {
+                    return $oRule->render($oOutputFormat->nextLevel());
+                });
+                if ($sRendered === null) {
+                    continue;
+                }
+                if ($bIsFirst) {
+                    $bIsFirst = false;
+                    $sResult .= $oOutputFormat->nextLevel()->spaceBeforeRules();
+                } else {
+                    $sResult .= $oOutputFormat->nextLevel()->spaceBetweenRules();
+                }
+                $sResult .= $sRendered;
+            }
+        }
+
+        if (!$bIsFirst) {
+            // Had some output
+            $sResult .= $oOutputFormat->spaceAfterRules();
+        }
+
+        return $oOutputFormat->removeLastSemicolon($sResult);
+    }
+
+    /**
+     * @param array<string, Comment> $aComments
+     *
+     * @return void
+     */
+    public function addComments(array $aComments)
+    {
+        $this->aComments = array_merge($this->aComments, $aComments);
+    }
+
+    /**
+     * @return array<string, Comment>
+     */
+    public function getComments()
+    {
+        return $this->aComments;
+    }
+
+    /**
+     * @param array<string, Comment> $aComments
+     *
+     * @return void
+     */
+    public function setComments(array $aComments)
+    {
+        $this->aComments = $aComments;
+    }
+}

vendor/sabberworm/php-css-parser/src/Settings.php

@@ -0,0 +1,89 @@
+<?php
+
+namespace Sabberworm\CSS;
+
+/**
+ * Parser settings class.
+ *
+ * Configure parser behaviour here.
+ */
+class Settings
+{
+    /**
+     * Multi-byte string support.
+     * If true (mbstring extension must be enabled), will use (slower) `mb_strlen`, `mb_convert_case`, `mb_substr`
+     * and `mb_strpos` functions. Otherwise, the normal (ASCII-Only) functions will be used.
+     *
+     * @var bool
+     */
+    public $bMultibyteSupport;
+
+    /**
+     * The default charset for the CSS if no `@charset` rule is found. Defaults to utf-8.
+     *
+     * @var string
+     */
+    public $sDefaultCharset = 'utf-8';
+
+    /**
+     * Lenient parsing. When used (which is true by default), the parser will not choke
+     * on unexpected tokens but simply ignore them.
+     *
+     * @var bool
+     */
+    public $bLenientParsing = true;
+
+    private function __construct()
+    {
+        $this->bMultibyteSupport = extension_loaded('mbstring');
+    }
+
+    /**
+     * @return self new instance
+     */
+    public static function create()
+    {
+        return new Settings();
+    }
+
+    /**
+     * @param bool $bMultibyteSupport
+     *
+     * @return self fluent interface
+     */
+    public function withMultibyteSupport($bMultibyteSupport = true)
+    {
+        $this->bMultibyteSupport = $bMultibyteSupport;
+        return $this;
+    }
+
+    /**
+     * @param string $sDefaultCharset
+     *
+     * @return self fluent interface
+     */
+    public function withDefaultCharset($sDefaultCharset)
+    {
+        $this->sDefaultCharset = $sDefaultCharset;
+        return $this;
+    }
+
+    /**
+     * @param bool $bLenientParsing
+     *
+     * @return self fluent interface
+     */
+    public function withLenientParsing($bLenientParsing = true)
+    {
+        $this->bLenientParsing = $bLenientParsing;
+        return $this;
+    }
+
+    /**
+     * @return self fluent interface
+     */
+    public function beStrict()
+    {
+        return $this->withLenientParsing(false);
+    }
+}

vendor/sabberworm/php-css-parser/src/Value/CSSFunction.php

@@ -0,0 +1,73 @@
+<?php
+
+namespace Sabberworm\CSS\Value;
+
+use Sabberworm\CSS\OutputFormat;
+
+class CSSFunction extends ValueList
+{
+    /**
+     * @var string
+     */
+    protected $sName;
+
+    /**
+     * @param string $sName
+     * @param RuleValueList|array<int, RuleValueList|CSSFunction|CSSString|LineName|Size|URL|string> $aArguments
+     * @param string $sSeparator
+     * @param int $iLineNo
+     */
+    public function __construct($sName, $aArguments, $sSeparator = ',', $iLineNo = 0)
+    {
+        if ($aArguments instanceof RuleValueList) {
+            $sSeparator = $aArguments->getListSeparator();
+            $aArguments = $aArguments->getListComponents();
+        }
+        $this->sName = $sName;
+        $this->iLineNo = $iLineNo;
+        parent::__construct($aArguments, $sSeparator, $iLineNo);
+    }
+
+    /**
+     * @return string
+     */
+    public function getName()
+    {
+        return $this->sName;
+    }
+
+    /**
+     * @param string $sName
+     *
+     * @return void
+     */
+    public function setName($sName)
+    {
+        $this->sName = $sName;
+    }
+
+    /**
+     * @return array<int, RuleValueList|CSSFunction|CSSString|LineName|Size|URL|string>
+     */
+    public function getArguments()
+    {
+        return $this->aComponents;
+    }
+
+    /**
+     * @return string
+     */
+    public function __toString()
+    {
+        return $this->render(new OutputFormat());
+    }
+
+    /**
+     * @return string
+     */
+    public function render(OutputFormat $oOutputFormat)
+    {
+        $aArguments = parent::render($oOutputFormat);
+        return "{$this->sName}({$aArguments})";
+    }
+}

vendor/sabberworm/php-css-parser/src/Value/CSSString.php

@@ -0,0 +1,105 @@
+<?php
+
+namespace Sabberworm\CSS\Value;
+
+use Sabberworm\CSS\OutputFormat;
+use Sabberworm\CSS\Parsing\ParserState;
+use Sabberworm\CSS\Parsing\SourceException;
+use Sabberworm\CSS\Parsing\UnexpectedEOFException;
+use Sabberworm\CSS\Parsing\UnexpectedTokenException;
+
+class CSSString extends PrimitiveValue
+{
+    /**
+     * @var string
+     */
+    private $sString;
+
+    /**
+     * @param string $sString
+     * @param int $iLineNo
+     */
+    public function __construct($sString, $iLineNo = 0)
+    {
+        $this->sString = $sString;
+        parent::__construct($iLineNo);
+    }
+
+    /**
+     * @return CSSString
+     *
+     * @throws SourceException
+     * @throws UnexpectedEOFException
+     * @throws UnexpectedTokenException
+     */
+    public static function parse(ParserState $oParserState)
+    {
+        $sBegin = $oParserState->peek();
+        $sQuote = null;
+        if ($sBegin === "'") {
+            $sQuote = "'";
+        } elseif ($sBegin === '"') {
+            $sQuote = '"';
+        }
+        if ($sQuote !== null) {
+            $oParserState->consume($sQuote);
+        }
+        $sResult = "";
+        $sContent = null;
+        if ($sQuote === null) {
+            // Unquoted strings end in whitespace or with braces, brackets, parentheses
+            while (!preg_match('/[\\s{}()<>\\[\\]]/isu', $oParserState->peek())) {
+                $sResult .= $oParserState->parseCharacter(false);
+            }
+        } else {
+            while (!$oParserState->comes($sQuote)) {
+                $sContent = $oParserState->parseCharacter(false);
+                if ($sContent === null) {
+                    throw new SourceException(
+                        "Non-well-formed quoted string {$oParserState->peek(3)}",
+                        $oParserState->currentLine()
+                    );
+                }
+                $sResult .= $sContent;
+            }
+            $oParserState->consume($sQuote);
+        }
+        return new CSSString($sResult, $oParserState->currentLine());
+    }
+
+    /**
+     * @param string $sString
+     *
+     * @return void
+     */
+    public function setString($sString)
+    {
+        $this->sString = $sString;
+    }
+
+    /**
+     * @return string
+     */
+    public function getString()
+    {
+        return $this->sString;
+    }
+
+    /**
+     * @return string
+     */
+    public function __toString()
+    {
+        return $this->render(new OutputFormat());
+    }
+
+    /**
+     * @return string
+     */
+    public function render(OutputFormat $oOutputFormat)
+    {
+        $sString = addslashes($this->sString);
+        $sString = str_replace("\n", '\A', $sString);
+        return $oOutputFormat->getStringQuotingType() . $sString . $oOutputFormat->getStringQuotingType();
+    }
+}

vendor/sabberworm/php-css-parser/src/Value/CalcFunction.php

@@ -0,0 +1,89 @@
+<?php
+
+namespace Sabberworm\CSS\Value;
+
+use Sabberworm\CSS\Parsing\ParserState;
+use Sabberworm\CSS\Parsing\UnexpectedEOFException;
+use Sabberworm\CSS\Parsing\UnexpectedTokenException;
+
+class CalcFunction extends CSSFunction
+{
+    /**
+     * @var int
+     */
+    const T_OPERAND = 1;
+
+    /**
+     * @var int
+     */
+    const T_OPERATOR = 2;
+
+    /**
+     * @return CalcFunction
+     *
+     * @throws UnexpectedTokenException
+     * @throws UnexpectedEOFException
+     */
+    public static function parse(ParserState $oParserState)
+    {
+        $aOperators = ['+', '-', '*', '/'];
+        $sFunction = trim($oParserState->consumeUntil('(', false, true));
+        $oCalcList = new CalcRuleValueList($oParserState->currentLine());
+        $oList = new RuleValueList(',', $oParserState->currentLine());
+        $iNestingLevel = 0;
+        $iLastComponentType = null;
+        while (!$oParserState->comes(')') || $iNestingLevel > 0) {
+            $oParserState->consumeWhiteSpace();
+            if ($oParserState->comes('(')) {
+                $iNestingLevel++;
+                $oCalcList->addListComponent($oParserState->consume(1));
+                $oParserState->consumeWhiteSpace();
+                continue;
+            } elseif ($oParserState->comes(')')) {
+                $iNestingLevel--;
+                $oCalcList->addListComponent($oParserState->consume(1));
+                $oParserState->consumeWhiteSpace();
+                continue;
+            }
+            if ($iLastComponentType != CalcFunction::T_OPERAND) {
+                $oVal = Value::parsePrimitiveValue($oParserState);
+                $oCalcList->addListComponent($oVal);
+                $iLastComponentType = CalcFunction::T_OPERAND;
+            } else {
+                if (in_array($oParserState->peek(), $aOperators)) {
+                    if (($oParserState->comes('-') || $oParserState->comes('+'))) {
+                        if (
+                            $oParserState->peek(1, -1) != ' '
+                            || !($oParserState->comes('- ')
+                                || $oParserState->comes('+ '))
+                        ) {
+                            throw new UnexpectedTokenException(
+                                " {$oParserState->peek()} ",
+                                $oParserState->peek(1, -1) . $oParserState->peek(2),
+                                'literal',
+                                $oParserState->currentLine()
+                            );
+                        }
+                    }
+                    $oCalcList->addListComponent($oParserState->consume(1));
+                    $iLastComponentType = CalcFunction::T_OPERATOR;
+                } else {
+                    throw new UnexpectedTokenException(
+                        sprintf(
+                            'Next token was expected to be an operand of type %s. Instead "%s" was found.',
+                            implode(', ', $aOperators),
+                            $oVal
+                        ),
+                        '',
+                        'custom',
+                        $oParserState->currentLine()
+                    );
+                }
+            }
+            $oParserState->consumeWhiteSpace();
+        }
+        $oList->addListComponent($oCalcList);
+        $oParserState->consume(')');
+        return new CalcFunction($sFunction, $oList, ',', $oParserState->currentLine());
+    }
+}

vendor/sabberworm/php-css-parser/src/Value/CalcRuleValueList.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace Sabberworm\CSS\Value;
+
+use Sabberworm\CSS\OutputFormat;
+
+class CalcRuleValueList extends RuleValueList
+{
+    /**
+     * @param int $iLineNo
+     */
+    public function __construct($iLineNo = 0)
+    {
+        parent::__construct(',', $iLineNo);
+    }
+
+    /**
+     * @return string
+     */
+    public function render(OutputFormat $oOutputFormat)
+    {
+        return $oOutputFormat->implode(' ', $this->aComponents);
+    }
+}

vendor/sabberworm/php-css-parser/src/Value/Color.php

@@ -0,0 +1,166 @@
+<?php
+
+namespace Sabberworm\CSS\Value;
+
+use Sabberworm\CSS\OutputFormat;
+use Sabberworm\CSS\Parsing\ParserState;
+use Sabberworm\CSS\Parsing\UnexpectedEOFException;
+use Sabberworm\CSS\Parsing\UnexpectedTokenException;
+
+class Color extends CSSFunction
+{
+    /**
+     * @param array<int, RuleValueList|CSSFunction|CSSString|LineName|Size|URL|string> $aColor
+     * @param int $iLineNo
+     */
+    public function __construct(array $aColor, $iLineNo = 0)
+    {
+        parent::__construct(implode('', array_keys($aColor)), $aColor, ',', $iLineNo);
+    }
+
+    /**
+     * @return Color|CSSFunction
+     *
+     * @throws UnexpectedEOFException
+     * @throws UnexpectedTokenException
+     */
+    public static function parse(ParserState $oParserState)
+    {
+        $aColor = [];
+        if ($oParserState->comes('#')) {
+            $oParserState->consume('#');
+            $sValue = $oParserState->parseIdentifier(false);
+            if ($oParserState->strlen($sValue) === 3) {
+                $sValue = $sValue[0] . $sValue[0] . $sValue[1] . $sValue[1] . $sValue[2] . $sValue[2];
+            } elseif ($oParserState->strlen($sValue) === 4) {
+                $sValue = $sValue[0] . $sValue[0] . $sValue[1] . $sValue[1] . $sValue[2] . $sValue[2] . $sValue[3]
+                    . $sValue[3];
+            }
+
+            if ($oParserState->strlen($sValue) === 8) {
+                $aColor = [
+                    'r' => new Size(intval($sValue[0] . $sValue[1], 16), null, true, $oParserState->currentLine()),
+                    'g' => new Size(intval($sValue[2] . $sValue[3], 16), null, true, $oParserState->currentLine()),
+                    'b' => new Size(intval($sValue[4] . $sValue[5], 16), null, true, $oParserState->currentLine()),
+                    'a' => new Size(
+                        round(self::mapRange(intval($sValue[6] . $sValue[7], 16), 0, 255, 0, 1), 2),
+                        null,
+                        true,
+                        $oParserState->currentLine()
+                    ),
+                ];
+            } else {
+                $aColor = [
+                    'r' => new Size(intval($sValue[0] . $sValue[1], 16), null, true, $oParserState->currentLine()),
+                    'g' => new Size(intval($sValue[2] . $sValue[3], 16), null, true, $oParserState->currentLine()),
+                    'b' => new Size(intval($sValue[4] . $sValue[5], 16), null, true, $oParserState->currentLine()),
+                ];
+            }
+        } else {
+            $sColorMode = $oParserState->parseIdentifier(true);
+            $oParserState->consumeWhiteSpace();
+            $oParserState->consume('(');
+
+            $bContainsVar = false;
+            $iLength = $oParserState->strlen($sColorMode);
+            for ($i = 0; $i < $iLength; ++$i) {
+                $oParserState->consumeWhiteSpace();
+                if ($oParserState->comes('var')) {
+                    $aColor[$sColorMode[$i]] = CSSFunction::parseIdentifierOrFunction($oParserState);
+                    $bContainsVar = true;
+                } else {
+                    $aColor[$sColorMode[$i]] = Size::parse($oParserState, true);
+                }
+
+                if ($bContainsVar && $oParserState->comes(')')) {
+                    // With a var argument the function can have fewer arguments
+                    break;
+                }
+
+                $oParserState->consumeWhiteSpace();
+                if ($i < ($iLength - 1)) {
+                    $oParserState->consume(',');
+                }
+            }
+            $oParserState->consume(')');
+
+            if ($bContainsVar) {
+                return new CSSFunction($sColorMode, array_values($aColor), ',', $oParserState->currentLine());
+            }
+        }
+        return new Color($aColor, $oParserState->currentLine());
+    }
+
+    /**
+     * @param float $fVal
+     * @param float $fFromMin
+     * @param float $fFromMax
+     * @param float $fToMin
+     * @param float $fToMax
+     *
+     * @return float
+     */
+    private static function mapRange($fVal, $fFromMin, $fFromMax, $fToMin, $fToMax)
+    {
+        $fFromRange = $fFromMax - $fFromMin;
+        $fToRange = $fToMax - $fToMin;
+        $fMultiplier = $fToRange / $fFromRange;
+        $fNewVal = $fVal - $fFromMin;
+        $fNewVal *= $fMultiplier;
+        return $fNewVal + $fToMin;
+    }
+
+    /**
+     * @return array<int, RuleValueList|CSSFunction|CSSString|LineName|Size|URL|string>
+     */
+    public function getColor()
+    {
+        return $this->aComponents;
+    }
+
+    /**
+     * @param array<int, RuleValueList|CSSFunction|CSSString|LineName|Size|URL|string> $aColor
+     *
+     * @return void
+     */
+    public function setColor(array $aColor)
+    {
+        $this->setName(implode('', array_keys($aColor)));
+        $this->aComponents = $aColor;
+    }
+
+    /**
+     * @return string
+     */
+    public function getColorDescription()
+    {
+        return $this->getName();
+    }
+
+    /**
+     * @return string
+     */
+    public function __toString()
+    {
+        return $this->render(new OutputFormat());
+    }
+
+    /**
+     * @return string
+     */
+    public function render(OutputFormat $oOutputFormat)
+    {
+        // Shorthand RGB color values
+        if ($oOutputFormat->getRGBHashNotation() && implode('', array_keys($this->aComponents)) === 'rgb') {
+            $sResult = sprintf(
+                '%02x%02x%02x',
+                $this->aComponents['r']->getSize(),
+                $this->aComponents['g']->getSize(),
+                $this->aComponents['b']->getSize()
+            );
+            return '#' . (($sResult[0] == $sResult[1]) && ($sResult[2] == $sResult[3]) && ($sResult[4] == $sResult[5])
+                    ? "$sResult[0]$sResult[2]$sResult[4]" : $sResult);
+        }
+        return parent::render($oOutputFormat);
+    }
+}

vendor/sabberworm/php-css-parser/src/Value/LineName.php

@@ -0,0 +1,65 @@
+<?php
+
+namespace Sabberworm\CSS\Value;
+
+use Sabberworm\CSS\OutputFormat;
+use Sabberworm\CSS\Parsing\ParserState;
+use Sabberworm\CSS\Parsing\UnexpectedEOFException;
+use Sabberworm\CSS\Parsing\UnexpectedTokenException;
+
+class LineName extends ValueList
+{
+    /**
+     * @param array<int, RuleValueList|CSSFunction|CSSString|LineName|Size|URL|string> $aComponents
+     * @param int $iLineNo
+     */
+    public function __construct(array $aComponents = [], $iLineNo = 0)
+    {
+        parent::__construct($aComponents, ' ', $iLineNo);
+    }
+
+    /**
+     * @return LineName
+     *
+     * @throws UnexpectedTokenException
+     * @throws UnexpectedEOFException
+     */
+    public static function parse(ParserState $oParserState)
+    {
+        $oParserState->consume('[');
+        $oParserState->consumeWhiteSpace();
+        $aNames = [];
+        do {
+            if ($oParserState->getSettings()->bLenientParsing) {
+                try {
+                    $aNames[] = $oParserState->parseIdentifier();
+                } catch (UnexpectedTokenException $e) {
+                    if (!$oParserState->comes(']')) {
+                        throw $e;
+                    }
+                }
+            } else {
+                $aNames[] = $oParserState->parseIdentifier();
+            }
+            $oParserState->consumeWhiteSpace();
+        } while (!$oParserState->comes(']'));
+        $oParserState->consume(']');
+        return new LineName($aNames, $oParserState->currentLine());
+    }
+
+    /**
+     * @return string
+     */
+    public function __toString()
+    {
+        return $this->render(new OutputFormat());
+    }
+
+    /**
+     * @return string
+     */
+    public function render(OutputFormat $oOutputFormat)
+    {
+        return '[' . parent::render(OutputFormat::createCompact()) . ']';
+    }
+}

vendor/sabberworm/php-css-parser/src/Value/PrimitiveValue.php

@@ -0,0 +1,14 @@
+<?php
+
+namespace Sabberworm\CSS\Value;
+
+abstract class PrimitiveValue extends Value
+{
+    /**
+     * @param int $iLineNo
+     */
+    public function __construct($iLineNo = 0)
+    {
+        parent::__construct($iLineNo);
+    }
+}

vendor/sabberworm/php-css-parser/src/Value/RuleValueList.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace Sabberworm\CSS\Value;
+
+class RuleValueList extends ValueList
+{
+    /**
+     * @param string $sSeparator
+     * @param int $iLineNo
+     */
+    public function __construct($sSeparator = ',', $iLineNo = 0)
+    {
+        parent::__construct([], $sSeparator, $iLineNo);
+    }
+}

vendor/sabberworm/php-css-parser/src/Value/Size.php

@@ -0,0 +1,209 @@
+<?php
+
+namespace Sabberworm\CSS\Value;
+
+use Sabberworm\CSS\OutputFormat;
+use Sabberworm\CSS\Parsing\ParserState;
+use Sabberworm\CSS\Parsing\UnexpectedEOFException;
+use Sabberworm\CSS\Parsing\UnexpectedTokenException;
+
+class Size extends PrimitiveValue
+{
+    /**
+     * vh/vw/vm(ax)/vmin/rem are absolute insofar as they don’t scale to the immediate parent (only the viewport)
+     *
+     * @var array<int, string>
+     */
+    const ABSOLUTE_SIZE_UNITS = ['px', 'cm', 'mm', 'mozmm', 'in', 'pt', 'pc', 'vh', 'vw', 'vmin', 'vmax', 'rem'];
+
+    /**
+     * @var array<int, string>
+     */
+    const RELATIVE_SIZE_UNITS = ['%', 'em', 'ex', 'ch', 'fr'];
+
+    /**
+     * @var array<int, string>
+     */
+    const NON_SIZE_UNITS = ['deg', 'grad', 'rad', 's', 'ms', 'turns', 'Hz', 'kHz'];
+
+    /**
+     * @var array<int, array<string, string>>|null
+     */
+    private static $SIZE_UNITS = null;
+
+    /**
+     * @var float
+     */
+    private $fSize;
+
+    /**
+     * @var string|null
+     */
+    private $sUnit;
+
+    /**
+     * @var bool
+     */
+    private $bIsColorComponent;
+
+    /**
+     * @param float|int|string $fSize
+     * @param string|null $sUnit
+     * @param bool $bIsColorComponent
+     * @param int $iLineNo
+     */
+    public function __construct($fSize, $sUnit = null, $bIsColorComponent = false, $iLineNo = 0)
+    {
+        parent::__construct($iLineNo);
+        $this->fSize = (float)$fSize;
+        $this->sUnit = $sUnit;
+        $this->bIsColorComponent = $bIsColorComponent;
+    }
+
+    /**
+     * @param bool $bIsColorComponent
+     *
+     * @return Size
+     *
+     * @throws UnexpectedEOFException
+     * @throws UnexpectedTokenException
+     */
+    public static function parse(ParserState $oParserState, $bIsColorComponent = false)
+    {
+        $sSize = '';
+        if ($oParserState->comes('-')) {
+            $sSize .= $oParserState->consume('-');
+        }
+        while (is_numeric($oParserState->peek()) || $oParserState->comes('.')) {
+            if ($oParserState->comes('.')) {
+                $sSize .= $oParserState->consume('.');
+            } else {
+                $sSize .= $oParserState->consume(1);
+            }
+        }
+
+        $sUnit = null;
+        $aSizeUnits = self::getSizeUnits();
+        foreach ($aSizeUnits as $iLength => &$aValues) {
+            $sKey = strtolower($oParserState->peek($iLength));
+            if (array_key_exists($sKey, $aValues)) {
+                if (($sUnit = $aValues[$sKey]) !== null) {
+                    $oParserState->consume($iLength);
+                    break;
+                }
+            }
+        }
+        return new Size((float)$sSize, $sUnit, $bIsColorComponent, $oParserState->currentLine());
+    }
+
+    /**
+     * @return array<int, array<string, string>>
+     */
+    private static function getSizeUnits()
+    {
+        if (!is_array(self::$SIZE_UNITS)) {
+            self::$SIZE_UNITS = [];
+            foreach (array_merge(self::ABSOLUTE_SIZE_UNITS, self::RELATIVE_SIZE_UNITS, self::NON_SIZE_UNITS) as $val) {
+                $iSize = strlen($val);
+                if (!isset(self::$SIZE_UNITS[$iSize])) {
+                    self::$SIZE_UNITS[$iSize] = [];
+                }
+                self::$SIZE_UNITS[$iSize][strtolower($val)] = $val;
+            }
+
+            krsort(self::$SIZE_UNITS, SORT_NUMERIC);
+        }
+
+        return self::$SIZE_UNITS;
+    }
+
+    /**
+     * @param string $sUnit
+     *
+     * @return void
+     */
+    public function setUnit($sUnit)
+    {
+        $this->sUnit = $sUnit;
+    }
+
+    /**
+     * @return string|null
+     */
+    public function getUnit()
+    {
+        return $this->sUnit;
+    }
+
+    /**
+     * @param float|int|string $fSize
+     */
+    public function setSize($fSize)
+    {
+        $this->fSize = (float)$fSize;
+    }
+
+    /**
+     * @return float
+     */
+    public function getSize()
+    {
+        return $this->fSize;
+    }
+
+    /**
+     * @return bool
+     */
+    public function isColorComponent()
+    {
+        return $this->bIsColorComponent;
+    }
+
+    /**
+     * Returns whether the number stored in this Size really represents a size (as in a length of something on screen).
+     *
+     * @return false if the unit an angle, a duration, a frequency or the number is a component in a Color object.
+     */
+    public function isSize()
+    {
+        if (in_array($this->sUnit, self::NON_SIZE_UNITS, true)) {
+            return false;
+        }
+        return !$this->isColorComponent();
+    }
+
+    /**
+     * @return bool
+     */
+    public function isRelative()
+    {
+        if (in_array($this->sUnit, self::RELATIVE_SIZE_UNITS, true)) {
+            return true;
+        }
+        if ($this->sUnit === null && $this->fSize != 0) {
+            return true;
+        }
+        return false;
+    }
+
+    /**
+     * @return string
+     */
+    public function __toString()
+    {
+        return $this->render(new OutputFormat());
+    }
+
+    /**
+     * @return string
+     */
+    public function render(OutputFormat $oOutputFormat)
+    {
+        $l = localeconv();
+        $sPoint = preg_quote($l['decimal_point'], '/');
+        $sSize = preg_match("/[\d\.]+e[+-]?\d+/i", (string)$this->fSize)
+            ? preg_replace("/$sPoint?0+$/", "", sprintf("%f", $this->fSize)) : $this->fSize;
+        return preg_replace(["/$sPoint/", "/^(-?)0\./"], ['.', '$1.'], $sSize)
+            . ($this->sUnit === null ? '' : $this->sUnit);
+    }
+}

vendor/sabberworm/php-css-parser/src/Value/URL.php

@@ -0,0 +1,82 @@
+<?php
+
+namespace Sabberworm\CSS\Value;
+
+use Sabberworm\CSS\OutputFormat;
+use Sabberworm\CSS\Parsing\ParserState;
+use Sabberworm\CSS\Parsing\SourceException;
+use Sabberworm\CSS\Parsing\UnexpectedEOFException;
+use Sabberworm\CSS\Parsing\UnexpectedTokenException;
+
+class URL extends PrimitiveValue
+{
+    /**
+     * @var CSSString
+     */
+    private $oURL;
+
+    /**
+     * @param int $iLineNo
+     */
+    public function __construct(CSSString $oURL, $iLineNo = 0)
+    {
+        parent::__construct($iLineNo);
+        $this->oURL = $oURL;
+    }
+
+    /**
+     * @return URL
+     *
+     * @throws SourceException
+     * @throws UnexpectedEOFException
+     * @throws UnexpectedTokenException
+     */
+    public static function parse(ParserState $oParserState)
+    {
+        $bUseUrl = $oParserState->comes('url', true);
+        if ($bUseUrl) {
+            $oParserState->consume('url');
+            $oParserState->consumeWhiteSpace();
+            $oParserState->consume('(');
+        }
+        $oParserState->consumeWhiteSpace();
+        $oResult = new URL(CSSString::parse($oParserState), $oParserState->currentLine());
+        if ($bUseUrl) {
+            $oParserState->consumeWhiteSpace();
+            $oParserState->consume(')');
+        }
+        return $oResult;
+    }
+
+    /**
+     * @return void
+     */
+    public function setURL(CSSString $oURL)
+    {
+        $this->oURL = $oURL;
+    }
+
+    /**
+     * @return CSSString
+     */
+    public function getURL()
+    {
+        return $this->oURL;
+    }
+
+    /**
+     * @return string
+     */
+    public function __toString()
+    {
+        return $this->render(new OutputFormat());
+    }
+
+    /**
+     * @return string
+     */
+    public function render(OutputFormat $oOutputFormat)
+    {
+        return "url({$this->oURL->render($oOutputFormat)})";
+    }
+}

vendor/sabberworm/php-css-parser/src/Value/Value.php

@@ -0,0 +1,198 @@
+<?php
+
+namespace Sabberworm\CSS\Value;
+
+use Sabberworm\CSS\Parsing\ParserState;
+use Sabberworm\CSS\Parsing\SourceException;
+use Sabberworm\CSS\Parsing\UnexpectedEOFException;
+use Sabberworm\CSS\Parsing\UnexpectedTokenException;
+use Sabberworm\CSS\Renderable;
+
+abstract class Value implements Renderable
+{
+    /**
+     * @var int
+     */
+    protected $iLineNo;
+
+    /**
+     * @param int $iLineNo
+     */
+    public function __construct($iLineNo = 0)
+    {
+        $this->iLineNo = $iLineNo;
+    }
+
+    /**
+     * @param array<array-key, string> $aListDelimiters
+     *
+     * @return RuleValueList|CSSFunction|CSSString|LineName|Size|URL|string
+     *
+     * @throws UnexpectedTokenException
+     * @throws UnexpectedEOFException
+     */
+    public static function parseValue(ParserState $oParserState, array $aListDelimiters = [])
+    {
+        /** @var array<int, RuleValueList|CSSFunction|CSSString|LineName|Size|URL|string> $aStack */
+        $aStack = [];
+        $oParserState->consumeWhiteSpace();
+        //Build a list of delimiters and parsed values
+        while (
+            !($oParserState->comes('}') || $oParserState->comes(';') || $oParserState->comes('!')
+            || $oParserState->comes(')')
+            || $oParserState->comes('\\'))
+        ) {
+            if (count($aStack) > 0) {
+                $bFoundDelimiter = false;
+                foreach ($aListDelimiters as $sDelimiter) {
+                    if ($oParserState->comes($sDelimiter)) {
+                        array_push($aStack, $oParserState->consume($sDelimiter));
+                        $oParserState->consumeWhiteSpace();
+                        $bFoundDelimiter = true;
+                        break;
+                    }
+                }
+                if (!$bFoundDelimiter) {
+                    //Whitespace was the list delimiter
+                    array_push($aStack, ' ');
+                }
+            }
+            array_push($aStack, self::parsePrimitiveValue($oParserState));
+            $oParserState->consumeWhiteSpace();
+        }
+        // Convert the list to list objects
+        foreach ($aListDelimiters as $sDelimiter) {
+            if (count($aStack) === 1) {
+                return $aStack[0];
+            }
+            $iStartPosition = null;
+            while (($iStartPosition = array_search($sDelimiter, $aStack, true)) !== false) {
+                $iLength = 2; //Number of elements to be joined
+                for ($i = $iStartPosition + 2; $i < count($aStack); $i += 2, ++$iLength) {
+                    if ($sDelimiter !== $aStack[$i]) {
+                        break;
+                    }
+                }
+                $oList = new RuleValueList($sDelimiter, $oParserState->currentLine());
+                for ($i = $iStartPosition - 1; $i - $iStartPosition + 1 < $iLength * 2; $i += 2) {
+                    $oList->addListComponent($aStack[$i]);
+                }
+                array_splice($aStack, $iStartPosition - 1, $iLength * 2 - 1, [$oList]);
+            }
+        }
+        if (!isset($aStack[0])) {
+            throw new UnexpectedTokenException(
+                " {$oParserState->peek()} ",
+                $oParserState->peek(1, -1) . $oParserState->peek(2),
+                'literal',
+                $oParserState->currentLine()
+            );
+        }
+        return $aStack[0];
+    }
+
+    /**
+     * @param bool $bIgnoreCase
+     *
+     * @return CSSFunction|string
+     *
+     * @throws UnexpectedEOFException
+     * @throws UnexpectedTokenException
+     */
+    public static function parseIdentifierOrFunction(ParserState $oParserState, $bIgnoreCase = false)
+    {
+        $sResult = $oParserState->parseIdentifier($bIgnoreCase);
+
+        if ($oParserState->comes('(')) {
+            $oParserState->consume('(');
+            $aArguments = Value::parseValue($oParserState, ['=', ' ', ',']);
+            $sResult = new CSSFunction($sResult, $aArguments, ',', $oParserState->currentLine());
+            $oParserState->consume(')');
+        }
+
+        return $sResult;
+    }
+
+    /**
+     * @return CSSFunction|CSSString|LineName|Size|URL|string
+     *
+     * @throws UnexpectedEOFException
+     * @throws UnexpectedTokenException
+     * @throws SourceException
+     */
+    public static function parsePrimitiveValue(ParserState $oParserState)
+    {
+        $oValue = null;
+        $oParserState->consumeWhiteSpace();
+        if (
+            is_numeric($oParserState->peek())
+            || ($oParserState->comes('-.')
+                && is_numeric($oParserState->peek(1, 2)))
+            || (($oParserState->comes('-') || $oParserState->comes('.')) && is_numeric($oParserState->peek(1, 1)))
+        ) {
+            $oValue = Size::parse($oParserState);
+        } elseif ($oParserState->comes('#') || $oParserState->comes('rgb', true) || $oParserState->comes('hsl', true)) {
+            $oValue = Color::parse($oParserState);
+        } elseif ($oParserState->comes('url', true)) {
+            $oValue = URL::parse($oParserState);
+        } elseif (
+            $oParserState->comes('calc', true) || $oParserState->comes('-webkit-calc', true)
+            || $oParserState->comes('-moz-calc', true)
+        ) {
+            $oValue = CalcFunction::parse($oParserState);
+        } elseif ($oParserState->comes("'") || $oParserState->comes('"')) {
+            $oValue = CSSString::parse($oParserState);
+        } elseif ($oParserState->comes("progid:") && $oParserState->getSettings()->bLenientParsing) {
+            $oValue = self::parseMicrosoftFilter($oParserState);
+        } elseif ($oParserState->comes("[")) {
+            $oValue = LineName::parse($oParserState);
+        } elseif ($oParserState->comes("U+")) {
+            $oValue = self::parseUnicodeRangeValue($oParserState);
+        } else {
+            $oValue = self::parseIdentifierOrFunction($oParserState);
+        }
+        $oParserState->consumeWhiteSpace();
+        return $oValue;
+    }
+
+    /**
+     * @return CSSFunction
+     *
+     * @throws UnexpectedEOFException
+     * @throws UnexpectedTokenException
+     */
+    private static function parseMicrosoftFilter(ParserState $oParserState)
+    {
+        $sFunction = $oParserState->consumeUntil('(', false, true);
+        $aArguments = Value::parseValue($oParserState, [',', '=']);
+        return new CSSFunction($sFunction, $aArguments, ',', $oParserState->currentLine());
+    }
+
+    /**
+     * @return string
+     *
+     * @throws UnexpectedEOFException
+     * @throws UnexpectedTokenException
+     */
+    private static function parseUnicodeRangeValue(ParserState $oParserState)
+    {
+        $iCodepointMaxLength = 6; // Code points outside BMP can use up to six digits
+        $sRange = "";
+        $oParserState->consume("U+");
+        do {
+            if ($oParserState->comes('-')) {
+                $iCodepointMaxLength = 13; // Max length is 2 six digit code points + the dash(-) between them
+            }
+            $sRange .= $oParserState->consume(1);
+        } while (strlen($sRange) < $iCodepointMaxLength && preg_match("/[A-Fa-f0-9\?-]/", $oParserState->peek()));
+        return "U+{$sRange}";
+    }
+
+    /**
+     * @return int
+     */
+    public function getLineNo()
+    {
+        return $this->iLineNo;
+    }
+}

vendor/sabberworm/php-css-parser/src/Value/ValueList.php

@@ -0,0 +1,100 @@
+<?php
+
+namespace Sabberworm\CSS\Value;
+
+use Sabberworm\CSS\OutputFormat;
+
+abstract class ValueList extends Value
+{
+    /**
+     * @var array<int, RuleValueList|CSSFunction|CSSString|LineName|Size|URL|string>
+     */
+    protected $aComponents;
+
+    /**
+     * @var string
+     */
+    protected $sSeparator;
+
+    /**
+     * phpcs:ignore Generic.Files.LineLength
+     * @param array<int, RuleValueList|CSSFunction|CSSString|LineName|Size|URL|string>|RuleValueList|CSSFunction|CSSString|LineName|Size|URL|string $aComponents
+     * @param string $sSeparator
+     * @param int $iLineNo
+     */
+    public function __construct($aComponents = [], $sSeparator = ',', $iLineNo = 0)
+    {
+        parent::__construct($iLineNo);
+        if (!is_array($aComponents)) {
+            $aComponents = [$aComponents];
+        }
+        $this->aComponents = $aComponents;
+        $this->sSeparator = $sSeparator;
+    }
+
+    /**
+     * @param RuleValueList|CSSFunction|CSSString|LineName|Size|URL|string $mComponent
+     *
+     * @return void
+     */
+    public function addListComponent($mComponent)
+    {
+        $this->aComponents[] = $mComponent;
+    }
+
+    /**
+     * @return array<int, RuleValueList|CSSFunction|CSSString|LineName|Size|URL|string>
+     */
+    public function getListComponents()
+    {
+        return $this->aComponents;
+    }
+
+    /**
+     * @param array<int, RuleValueList|CSSFunction|CSSString|LineName|Size|URL|string> $aComponents
+     *
+     * @return void
+     */
+    public function setListComponents(array $aComponents)
+    {
+        $this->aComponents = $aComponents;
+    }
+
+    /**
+     * @return string
+     */
+    public function getListSeparator()
+    {
+        return $this->sSeparator;
+    }
+
+    /**
+     * @param string $sSeparator
+     *
+     * @return void
+     */
+    public function setListSeparator($sSeparator)
+    {
+        $this->sSeparator = $sSeparator;
+    }
+
+    /**
+     * @return string
+     */
+    public function __toString()
+    {
+        return $this->render(new OutputFormat());
+    }
+
+    /**
+     * @return string
+     */
+    public function render(OutputFormat $oOutputFormat)
+    {
+        return $oOutputFormat->implode(
+            $oOutputFormat->spaceBeforeListArgumentSeparator($this->sSeparator) . $this->sSeparator
+            . $oOutputFormat->spaceAfterListArgumentSeparator($this->sSeparator),
+            $this->aComponents
+        );
+    }
+}