521 lines
20 KiB
PHP
521 lines
20 KiB
PHP
<?php
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declare (strict_types=1);
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namespace MailPoetVendor\Pelago\Emogrifier;
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if (!defined('ABSPATH')) exit;
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use MailPoetVendor\Pelago\Emogrifier\Css\CssDocument;
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use MailPoetVendor\Pelago\Emogrifier\HtmlProcessor\AbstractHtmlProcessor;
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use MailPoetVendor\Pelago\Emogrifier\Utilities\CssConcatenator;
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use MailPoetVendor\Symfony\Component\CssSelector\CssSelectorConverter;
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use MailPoetVendor\Symfony\Component\CssSelector\Exception\ParseException;
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class CssInliner extends AbstractHtmlProcessor
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{
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private const CACHE_KEY_SELECTOR = 0;
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private const CACHE_KEY_CSS_DECLARATIONS_BLOCK = 1;
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private const CACHE_KEY_COMBINED_STYLES = 2;
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private const PSEUDO_CLASS_MATCHER = 'empty|(?:first|last|nth(?:-last)?+|only)-(?:child|of-type)|not\\([[:ascii:]]*\\)';
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private const OF_TYPE_PSEUDO_CLASS_MATCHER = '(?:first|last|nth(?:-last)?+|only)-of-type';
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private const COMBINATOR_MATCHER = '(?:\\s++|\\s*+[>+~]\\s*+)(?=[[:alpha:]_\\-.#*:\\[])';
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private $excludedSelectors = [];
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private $allowedMediaTypes = ['all' => \true, 'screen' => \true, 'print' => \true];
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private $caches = [self::CACHE_KEY_SELECTOR => [], self::CACHE_KEY_CSS_DECLARATIONS_BLOCK => [], self::CACHE_KEY_COMBINED_STYLES => []];
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private $cssSelectorConverter = null;
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private $visitedNodes = [];
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private $styleAttributesForNodes = [];
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private $isInlineStyleAttributesParsingEnabled = \true;
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private $isStyleBlocksParsingEnabled = \true;
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private $selectorPrecedenceMatchers = [
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// IDs: worth 10000
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'\\#' => 10000,
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// classes, attributes, pseudo-classes (not pseudo-elements) except `:not`: worth 100
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'(?:\\.|\\[|(?<!:):(?!not\\())' => 100,
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// elements (not attribute values or `:not`), pseudo-elements: worth 1
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'(?:(?<![="\':\\w\\-])|::)' => 1,
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];
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private $matchingUninlinableCssRules = null;
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private $debug = \false;
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public function inlineCss(string $css = '') : self
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{
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$this->clearAllCaches();
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$this->purgeVisitedNodes();
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$this->normalizeStyleAttributesOfAllNodes();
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$combinedCss = $css;
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// grab any existing style blocks from the HTML and append them to the existing CSS
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// (these blocks should be appended so as to have precedence over conflicting styles in the existing CSS)
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if ($this->isStyleBlocksParsingEnabled) {
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$combinedCss .= $this->getCssFromAllStyleNodes();
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}
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$parsedCss = new CssDocument($combinedCss, $this->debug);
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$excludedNodes = $this->getNodesToExclude();
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$cssRules = $this->collateCssRules($parsedCss);
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$cssSelectorConverter = $this->getCssSelectorConverter();
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foreach ($cssRules['inlinable'] as $cssRule) {
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try {
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$nodesMatchingCssSelectors = $this->getXPath()->query($cssSelectorConverter->toXPath($cssRule['selector']));
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foreach ($nodesMatchingCssSelectors as $node) {
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if (\in_array($node, $excludedNodes, \true)) {
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continue;
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}
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$this->copyInlinableCssToStyleAttribute($node, $cssRule);
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}
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} catch (ParseException $e) {
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if ($this->debug) {
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throw $e;
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}
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}
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}
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if ($this->isInlineStyleAttributesParsingEnabled) {
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$this->fillStyleAttributesWithMergedStyles();
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}
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$this->removeImportantAnnotationFromAllInlineStyles();
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$this->determineMatchingUninlinableCssRules($cssRules['uninlinable']);
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$this->copyUninlinableCssToStyleNode($parsedCss);
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return $this;
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}
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public function disableInlineStyleAttributesParsing() : self
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{
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$this->isInlineStyleAttributesParsingEnabled = \false;
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return $this;
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}
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public function disableStyleBlocksParsing() : self
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{
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$this->isStyleBlocksParsingEnabled = \false;
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return $this;
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}
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public function addAllowedMediaType(string $mediaName) : self
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{
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$this->allowedMediaTypes[$mediaName] = \true;
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return $this;
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}
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public function removeAllowedMediaType(string $mediaName) : self
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{
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if (isset($this->allowedMediaTypes[$mediaName])) {
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unset($this->allowedMediaTypes[$mediaName]);
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}
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return $this;
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}
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public function addExcludedSelector(string $selector) : self
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{
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$this->excludedSelectors[$selector] = \true;
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return $this;
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}
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public function removeExcludedSelector(string $selector) : self
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{
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if (isset($this->excludedSelectors[$selector])) {
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unset($this->excludedSelectors[$selector]);
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}
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return $this;
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}
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public function setDebug(bool $debug) : self
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{
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$this->debug = $debug;
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return $this;
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}
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public function getMatchingUninlinableSelectors() : array
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{
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return \array_column($this->getMatchingUninlinableCssRules(), 'selector');
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}
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private function getMatchingUninlinableCssRules() : array
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{
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if (!\is_array($this->matchingUninlinableCssRules)) {
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throw new \BadMethodCallException('inlineCss must be called first', 1568385221);
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}
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return $this->matchingUninlinableCssRules;
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}
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private function clearAllCaches() : void
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{
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$this->caches = [self::CACHE_KEY_SELECTOR => [], self::CACHE_KEY_CSS_DECLARATIONS_BLOCK => [], self::CACHE_KEY_COMBINED_STYLES => []];
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}
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private function purgeVisitedNodes() : void
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{
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$this->visitedNodes = [];
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$this->styleAttributesForNodes = [];
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}
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private function normalizeStyleAttributesOfAllNodes() : void
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{
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foreach ($this->getAllNodesWithStyleAttribute() as $node) {
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if ($this->isInlineStyleAttributesParsingEnabled) {
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$this->normalizeStyleAttributes($node);
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}
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// Remove style attribute in every case, so we can add them back (if inline style attributes
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// parsing is enabled) to the end of the style list, thus keeping the right priority of CSS rules;
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// else original inline style rules may remain at the beginning of the final inline style definition
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// of a node, which may give not the desired results
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$node->removeAttribute('style');
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}
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}
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private function getAllNodesWithStyleAttribute() : \DOMNodeList
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{
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$query = '//*[@style]';
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$matches = $this->getXPath()->query($query);
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if (!$matches instanceof \DOMNodeList) {
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throw new \RuntimeException('XPatch query failed: ' . $query, 1618577797);
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}
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return $matches;
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}
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private function normalizeStyleAttributes(\DOMElement $node) : void
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{
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$normalizedOriginalStyle = \preg_replace_callback(
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'/-?+[_a-zA-Z][\\w\\-]*+(?=:)/S',
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static function (array $propertyNameMatches) : string {
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return \strtolower($propertyNameMatches[0]);
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},
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$node->getAttribute('style')
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);
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// In order to not overwrite existing style attributes in the HTML, we have to save the original HTML styles.
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$nodePath = $node->getNodePath();
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if (\is_string($nodePath) && !isset($this->styleAttributesForNodes[$nodePath])) {
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$this->styleAttributesForNodes[$nodePath] = $this->parseCssDeclarationsBlock($normalizedOriginalStyle);
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$this->visitedNodes[$nodePath] = $node;
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}
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$node->setAttribute('style', $normalizedOriginalStyle);
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}
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private function parseCssDeclarationsBlock(string $cssDeclarationsBlock) : array
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{
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if (isset($this->caches[self::CACHE_KEY_CSS_DECLARATIONS_BLOCK][$cssDeclarationsBlock])) {
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return $this->caches[self::CACHE_KEY_CSS_DECLARATIONS_BLOCK][$cssDeclarationsBlock];
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}
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$properties = [];
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foreach (\preg_split('/;(?!base64|charset)/', $cssDeclarationsBlock) as $declaration) {
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$matches = [];
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if (!\preg_match('/^([A-Za-z\\-]+)\\s*:\\s*(.+)$/s', \trim($declaration), $matches)) {
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continue;
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}
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$propertyName = \strtolower($matches[1]);
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$propertyValue = $matches[2];
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$properties[$propertyName] = $propertyValue;
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}
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$this->caches[self::CACHE_KEY_CSS_DECLARATIONS_BLOCK][$cssDeclarationsBlock] = $properties;
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return $properties;
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}
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private function getCssFromAllStyleNodes() : string
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{
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$styleNodes = $this->getXPath()->query('//style');
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if ($styleNodes === \false) {
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return '';
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}
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$css = '';
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foreach ($styleNodes as $styleNode) {
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if (\is_string($styleNode->nodeValue)) {
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$css .= "\n\n" . $styleNode->nodeValue;
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}
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$parentNode = $styleNode->parentNode;
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if ($parentNode instanceof \DOMNode) {
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$parentNode->removeChild($styleNode);
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}
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}
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return $css;
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}
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private function getNodesToExclude() : array
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{
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$excludedNodes = [];
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foreach (\array_keys($this->excludedSelectors) as $selectorToExclude) {
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try {
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$matchingNodes = $this->getXPath()->query($this->getCssSelectorConverter()->toXPath($selectorToExclude));
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foreach ($matchingNodes as $node) {
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if (!$node instanceof \DOMElement) {
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$path = $node->getNodePath() ?? '$node';
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throw new \UnexpectedValueException($path . ' is not a DOMElement.', 1617975914);
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}
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$excludedNodes[] = $node;
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}
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} catch (ParseException $e) {
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if ($this->debug) {
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throw $e;
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}
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}
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}
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return $excludedNodes;
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}
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private function getCssSelectorConverter() : CssSelectorConverter
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{
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if (!$this->cssSelectorConverter instanceof CssSelectorConverter) {
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$this->cssSelectorConverter = new CssSelectorConverter();
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}
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return $this->cssSelectorConverter;
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}
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private function collateCssRules(CssDocument $parsedCss) : array
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{
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$matches = $parsedCss->getStyleRulesData(\array_keys($this->allowedMediaTypes));
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$cssRules = ['inlinable' => [], 'uninlinable' => []];
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foreach ($matches as $key => $cssRule) {
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if (!$cssRule->hasAtLeastOneDeclaration()) {
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continue;
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}
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$mediaQuery = $cssRule->getContainingAtRule();
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$declarationsBlock = $cssRule->getDeclarationAsText();
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foreach ($cssRule->getSelectors() as $selector) {
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// don't process pseudo-elements and behavioral (dynamic) pseudo-classes;
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// only allow structural pseudo-classes
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$hasPseudoElement = \strpos($selector, '::') !== \false;
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$hasUnmatchablePseudo = $hasPseudoElement || $this->hasUnsupportedPseudoClass($selector);
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$parsedCssRule = [
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'media' => $mediaQuery,
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'selector' => $selector,
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'hasUnmatchablePseudo' => $hasUnmatchablePseudo,
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'declarationsBlock' => $declarationsBlock,
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// keep track of where it appears in the file, since order is important
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'line' => $key,
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];
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$ruleType = !$cssRule->hasContainingAtRule() && !$hasUnmatchablePseudo ? 'inlinable' : 'uninlinable';
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$cssRules[$ruleType][] = $parsedCssRule;
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}
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}
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\usort(
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$cssRules['inlinable'],
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function (array $first, array $second) : int {
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return $this->sortBySelectorPrecedence($first, $second);
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}
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);
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return $cssRules;
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}
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private function hasUnsupportedPseudoClass(string $selector) : bool
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{
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if (\preg_match('/:(?!' . self::PSEUDO_CLASS_MATCHER . ')[\\w\\-]/i', $selector)) {
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return \true;
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}
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if (!\preg_match('/:(?:' . self::OF_TYPE_PSEUDO_CLASS_MATCHER . ')/i', $selector)) {
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return \false;
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}
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foreach (\preg_split('/' . self::COMBINATOR_MATCHER . '/', $selector) as $selectorPart) {
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if ($this->selectorPartHasUnsupportedOfTypePseudoClass($selectorPart)) {
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return \true;
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}
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}
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return \false;
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}
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private function selectorPartHasUnsupportedOfTypePseudoClass(string $selectorPart) : bool
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{
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if (\preg_match('/^[\\w\\-]/', $selectorPart)) {
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return \false;
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}
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return (bool) \preg_match('/:(?:' . self::OF_TYPE_PSEUDO_CLASS_MATCHER . ')/i', $selectorPart);
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}
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private function sortBySelectorPrecedence(array $first, array $second) : int
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{
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$precedenceOfFirst = $this->getCssSelectorPrecedence($first['selector']);
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$precedenceOfSecond = $this->getCssSelectorPrecedence($second['selector']);
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// We want these sorted in ascending order so selectors with lesser precedence get processed first and
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// selectors with greater precedence get sorted last.
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$precedenceForEquals = $first['line'] < $second['line'] ? -1 : 1;
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$precedenceForNotEquals = $precedenceOfFirst < $precedenceOfSecond ? -1 : 1;
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return $precedenceOfFirst === $precedenceOfSecond ? $precedenceForEquals : $precedenceForNotEquals;
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}
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private function getCssSelectorPrecedence(string $selector) : int
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{
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$selectorKey = \md5($selector);
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if (isset($this->caches[self::CACHE_KEY_SELECTOR][$selectorKey])) {
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return $this->caches[self::CACHE_KEY_SELECTOR][$selectorKey];
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}
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$precedence = 0;
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foreach ($this->selectorPrecedenceMatchers as $matcher => $value) {
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if (\trim($selector) === '') {
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break;
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}
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$number = 0;
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$selector = \preg_replace('/' . $matcher . '\\w+/', '', $selector, -1, $number);
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$precedence += $value * (int) $number;
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}
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$this->caches[self::CACHE_KEY_SELECTOR][$selectorKey] = $precedence;
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return $precedence;
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}
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private function copyInlinableCssToStyleAttribute(\DOMElement $node, array $cssRule) : void
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{
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$declarationsBlock = $cssRule['declarationsBlock'];
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$newStyleDeclarations = $this->parseCssDeclarationsBlock($declarationsBlock);
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if ($newStyleDeclarations === []) {
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return;
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}
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// if it has a style attribute, get it, process it, and append (overwrite) new stuff
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if ($node->hasAttribute('style')) {
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// break it up into an associative array
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$oldStyleDeclarations = $this->parseCssDeclarationsBlock($node->getAttribute('style'));
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} else {
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$oldStyleDeclarations = [];
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}
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$node->setAttribute('style', $this->generateStyleStringFromDeclarationsArrays($oldStyleDeclarations, $newStyleDeclarations));
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}
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private function generateStyleStringFromDeclarationsArrays(array $oldStyles, array $newStyles) : string
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{
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$cacheKey = \serialize([$oldStyles, $newStyles]);
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if (isset($this->caches[self::CACHE_KEY_COMBINED_STYLES][$cacheKey])) {
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return $this->caches[self::CACHE_KEY_COMBINED_STYLES][$cacheKey];
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}
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// Unset the overridden styles to preserve order, important if shorthand and individual properties are mixed
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foreach ($oldStyles as $attributeName => $attributeValue) {
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if (!isset($newStyles[$attributeName])) {
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continue;
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}
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$newAttributeValue = $newStyles[$attributeName];
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if ($this->attributeValueIsImportant($attributeValue) && !$this->attributeValueIsImportant($newAttributeValue)) {
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unset($newStyles[$attributeName]);
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} else {
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unset($oldStyles[$attributeName]);
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}
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}
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$combinedStyles = \array_merge($oldStyles, $newStyles);
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$style = '';
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foreach ($combinedStyles as $attributeName => $attributeValue) {
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$style .= \strtolower(\trim($attributeName)) . ': ' . \trim($attributeValue) . '; ';
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}
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$trimmedStyle = \rtrim($style);
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$this->caches[self::CACHE_KEY_COMBINED_STYLES][$cacheKey] = $trimmedStyle;
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return $trimmedStyle;
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}
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private function attributeValueIsImportant(string $attributeValue) : bool
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{
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return (bool) \preg_match('/!\\s*+important$/i', $attributeValue);
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}
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private function fillStyleAttributesWithMergedStyles() : void
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{
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foreach ($this->styleAttributesForNodes as $nodePath => $styleAttributesForNode) {
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$node = $this->visitedNodes[$nodePath];
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$currentStyleAttributes = $this->parseCssDeclarationsBlock($node->getAttribute('style'));
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$node->setAttribute('style', $this->generateStyleStringFromDeclarationsArrays($currentStyleAttributes, $styleAttributesForNode));
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}
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}
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private function removeImportantAnnotationFromAllInlineStyles() : void
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{
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foreach ($this->getAllNodesWithStyleAttribute() as $node) {
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$this->removeImportantAnnotationFromNodeInlineStyle($node);
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}
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}
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private function removeImportantAnnotationFromNodeInlineStyle(\DOMElement $node) : void
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{
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$inlineStyleDeclarations = $this->parseCssDeclarationsBlock($node->getAttribute('style'));
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$regularStyleDeclarations = [];
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$importantStyleDeclarations = [];
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foreach ($inlineStyleDeclarations as $property => $value) {
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if ($this->attributeValueIsImportant($value)) {
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$importantStyleDeclarations[$property] = $this->pregReplace('/\\s*+!\\s*+important$/i', '', $value);
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} else {
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$regularStyleDeclarations[$property] = $value;
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}
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}
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$inlineStyleDeclarationsInNewOrder = \array_merge($regularStyleDeclarations, $importantStyleDeclarations);
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$node->setAttribute('style', $this->generateStyleStringFromSingleDeclarationsArray($inlineStyleDeclarationsInNewOrder));
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}
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private function generateStyleStringFromSingleDeclarationsArray(array $styleDeclarations) : string
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{
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return $this->generateStyleStringFromDeclarationsArrays([], $styleDeclarations);
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}
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private function determineMatchingUninlinableCssRules(array $cssRules) : void
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{
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$this->matchingUninlinableCssRules = \array_filter($cssRules, function (array $cssRule) : bool {
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return $this->existsMatchForSelectorInCssRule($cssRule);
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});
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}
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private function existsMatchForSelectorInCssRule(array $cssRule) : bool
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{
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$selector = $cssRule['selector'];
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if ($cssRule['hasUnmatchablePseudo']) {
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$selector = $this->removeUnmatchablePseudoComponents($selector);
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}
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return $this->existsMatchForCssSelector($selector);
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}
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private function existsMatchForCssSelector(string $cssSelector) : bool
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{
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try {
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$nodesMatchingSelector = $this->getXPath()->query($this->getCssSelectorConverter()->toXPath($cssSelector));
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} catch (ParseException $e) {
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if ($this->debug) {
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throw $e;
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}
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return \true;
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}
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return $nodesMatchingSelector !== \false && $nodesMatchingSelector->length !== 0;
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}
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private function removeUnmatchablePseudoComponents(string $selector) : string
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{
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// The regex allows nested brackets via `(?2)`.
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// A space is temporarily prepended because the callback can't determine if the match was at the very start.
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$selectorWithoutNots = \ltrim(\preg_replace_callback(
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'/([\\s>+~]?+):not(\\([^()]*+(?:(?2)[^()]*+)*+\\))/i',
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function (array $matches) : string {
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return $this->replaceUnmatchableNotComponent($matches);
|
|
},
|
|
' ' . $selector
|
|
));
|
|
$selectorWithoutUnmatchablePseudoComponents = $this->removeSelectorComponents(':(?!' . self::PSEUDO_CLASS_MATCHER . '):?+[\\w\\-]++(?:\\([^\\)]*+\\))?+', $selectorWithoutNots);
|
|
if (!\preg_match('/:(?:' . self::OF_TYPE_PSEUDO_CLASS_MATCHER . ')/i', $selectorWithoutUnmatchablePseudoComponents)) {
|
|
return $selectorWithoutUnmatchablePseudoComponents;
|
|
}
|
|
return \implode('', \array_map(function (string $selectorPart) : string {
|
|
return $this->removeUnsupportedOfTypePseudoClasses($selectorPart);
|
|
}, \preg_split('/(' . self::COMBINATOR_MATCHER . ')/', $selectorWithoutUnmatchablePseudoComponents, -1, \PREG_SPLIT_DELIM_CAPTURE | \PREG_SPLIT_NO_EMPTY)));
|
|
}
|
|
private function replaceUnmatchableNotComponent(array $matches) : string
|
|
{
|
|
[$notComponentWithAnyPrecedingCombinator, $anyPrecedingCombinator, $notArgumentInBrackets] = $matches;
|
|
if ($this->hasUnsupportedPseudoClass($notArgumentInBrackets)) {
|
|
return $anyPrecedingCombinator !== '' ? $anyPrecedingCombinator . '*' : '';
|
|
}
|
|
return $notComponentWithAnyPrecedingCombinator;
|
|
}
|
|
private function removeSelectorComponents(string $matcher, string $selector) : string
|
|
{
|
|
return \preg_replace(['/([\\s>+~]|^)' . $matcher . '/i', '/' . $matcher . '/i'], ['$1*', ''], $selector);
|
|
}
|
|
private function removeUnsupportedOfTypePseudoClasses(string $selectorPart) : string
|
|
{
|
|
if (!$this->selectorPartHasUnsupportedOfTypePseudoClass($selectorPart)) {
|
|
return $selectorPart;
|
|
}
|
|
return $this->removeSelectorComponents(':(?:' . self::OF_TYPE_PSEUDO_CLASS_MATCHER . ')(?:\\([^\\)]*+\\))?+', $selectorPart);
|
|
}
|
|
private function copyUninlinableCssToStyleNode(CssDocument $parsedCss) : void
|
|
{
|
|
$css = $parsedCss->renderNonConditionalAtRules();
|
|
// avoid including unneeded class dependency if there are no rules
|
|
if ($this->getMatchingUninlinableCssRules() !== []) {
|
|
$cssConcatenator = new CssConcatenator();
|
|
foreach ($this->getMatchingUninlinableCssRules() as $cssRule) {
|
|
$cssConcatenator->append([$cssRule['selector']], $cssRule['declarationsBlock'], $cssRule['media']);
|
|
}
|
|
$css .= $cssConcatenator->getCss();
|
|
}
|
|
// avoid adding empty style element
|
|
if ($css !== '') {
|
|
$this->addStyleElementToDocument($css);
|
|
}
|
|
}
|
|
protected function addStyleElementToDocument(string $css) : void
|
|
{
|
|
$domDocument = $this->getDomDocument();
|
|
$styleElement = $domDocument->createElement('style', $css);
|
|
$styleAttribute = $domDocument->createAttribute('type');
|
|
$styleAttribute->value = 'text/css';
|
|
$styleElement->appendChild($styleAttribute);
|
|
$headElement = $this->getHeadElement();
|
|
$headElement->appendChild($styleElement);
|
|
}
|
|
private function getHeadElement() : \DOMElement
|
|
{
|
|
$node = $this->getDomDocument()->getElementsByTagName('head')->item(0);
|
|
if (!$node instanceof \DOMElement) {
|
|
throw new \UnexpectedValueException('There is no HEAD element. This should never happen.', 1617923227);
|
|
}
|
|
return $node;
|
|
}
|
|
private function pregReplace(string $pattern, string $replacement, string $subject) : string
|
|
{
|
|
$result = \preg_replace($pattern, $replacement, $subject);
|
|
if (!\is_string($result)) {
|
|
$this->logOrThrowPregLastError();
|
|
$result = $subject;
|
|
}
|
|
return $result;
|
|
}
|
|
private function logOrThrowPregLastError() : void
|
|
{
|
|
$pcreConstants = \get_defined_constants(\true)['pcre'];
|
|
$pcreErrorConstantNames = \array_flip(\array_filter($pcreConstants, static function (string $key) : bool {
|
|
return \substr($key, -6) === '_ERROR';
|
|
}, \ARRAY_FILTER_USE_KEY));
|
|
$pregLastError = \preg_last_error();
|
|
$message = 'PCRE regex execution error `' . (string) ($pcreErrorConstantNames[$pregLastError] ?? $pregLastError) . '`';
|
|
if ($this->debug) {
|
|
throw new \RuntimeException($message, 1592870147);
|
|
}
|
|
\trigger_error($message);
|
|
}
|
|
}
|