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Emogrifier.php
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Emogrifier.php
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<?php
namespace Pelago;
/**
* This class provides functions for converting CSS styles into inline style attributes in your HTML code.
*
* For more information, please see the README.md file.
*
* @version 2.0.0
*
* @author Cameron Brooks
* @author Jaime Prado
* @author Oliver Klee <[email protected]>
* @author Roman Ožana <[email protected]>
* @author Sander Kruger <[email protected]>
* @author Zoli Szabó <[email protected]>
*/
class Emogrifier
{
/**
* @var int
*/
const CACHE_KEY_CSS = 0;
/**
* @var int
*/
const CACHE_KEY_SELECTOR = 1;
/**
* @var int
*/
const CACHE_KEY_XPATH = 2;
/**
* @var int
*/
const CACHE_KEY_CSS_DECLARATIONS_BLOCK = 3;
/**
* @var int
*/
const CACHE_KEY_COMBINED_STYLES = 4;
/**
* for calculating nth-of-type and nth-child selectors
*
* @var int
*/
const INDEX = 0;
/**
* for calculating nth-of-type and nth-child selectors
*
* @var int
*/
const MULTIPLIER = 1;
/**
* @var string
*/
const ID_ATTRIBUTE_MATCHER = '/(\\w+)?\\#([\\w\\-]+)/';
/**
* @var string
*/
const CLASS_ATTRIBUTE_MATCHER = '/(\\w+|[\\*\\]])?((\\.[\\w\\-]+)+)/';
/**
* @var string
*/
const CONTENT_TYPE_META_TAG = '<meta http-equiv="Content-Type" content="text/html; charset=utf-8">';
/**
* @var string
*/
const DEFAULT_DOCUMENT_TYPE = '<!DOCTYPE html>';
/**
* @var string
*/
private $html = '';
/**
* @var string
*/
private $css = '';
/**
* @var bool[]
*/
private $excludedSelectors = [];
/**
* @var string[]
*/
private $unprocessableHtmlTags = ['wbr'];
/**
* @var bool[]
*/
private $allowedMediaTypes = ['all' => true, 'screen' => true, 'print' => true];
/**
* @var mixed[]
*/
private $caches = [
self::CACHE_KEY_CSS => [],
self::CACHE_KEY_SELECTOR => [],
self::CACHE_KEY_XPATH => [],
self::CACHE_KEY_CSS_DECLARATIONS_BLOCK => [],
self::CACHE_KEY_COMBINED_STYLES => [],
];
/**
* the visited nodes with the XPath paths as array keys
*
* @var \DOMElement[]
*/
private $visitedNodes = [];
/**
* the styles to apply to the nodes with the XPath paths as array keys for the outer array
* and the attribute names/values as key/value pairs for the inner array
*
* @var string[][]
*/
private $styleAttributesForNodes = [];
/**
* Determines whether the "style" attributes of tags in the the HTML passed to this class should be preserved.
* If set to false, the value of the style attributes will be discarded.
*
* @var bool
*/
private $isInlineStyleAttributesParsingEnabled = true;
/**
* Determines whether the <style> blocks in the HTML passed to this class should be parsed.
*
* If set to true, the <style> blocks will be removed from the HTML and their contents will be applied to the HTML
* via inline styles.
*
* If set to false, the <style> blocks will be left as they are in the HTML.
*
* @var bool
*/
private $isStyleBlocksParsingEnabled = true;
/**
* Determines whether elements with the `display: none` property are
* removed from the DOM.
*
* @var bool
*/
private $shouldRemoveInvisibleNodes = true;
/**
* For calculating selector precedence order.
* Keys are a regular expression part to match before a CSS name.
* Values are a multiplier factor per match to weight specificity.
*
* @var int[]
*/
private $selectorPrecedenceMatchers = [
// IDs: worth 10000
'\\#' => 10000,
// classes, attributes, pseudo-classes (not pseudo-elements) except `:not`: worth 100
'(?:\\.|\\[|(?<!:):(?!not\\())' => 100,
// elements (not attribute values or `:not`), pseudo-elements: worth 1
'(?:(?<![="\':\\w-])|::)' => 1
];
/**
* @var string[]
*/
private $xPathRules = [
// attribute presence
'/^\\[(\\w+|\\w+\\=[\'"]?\\w+[\'"]?)\\]/' => '*[@\\1]',
// type and attribute exact value
'/(\\w)\\[(\\w+)\\=[\'"]?([\\w\\s]+)[\'"]?\\]/' => '\\1[@\\2="\\3"]',
// type and attribute value with ~ (one word within a whitespace-separated list of words)
'/([\\w\\*]+)\\[(\\w+)[\\s]*\\~\\=[\\s]*[\'"]?([\\w-_\\/]+)[\'"]?\\]/'
=> '\\1[contains(concat(" ", @\\2, " "), concat(" ", "\\3", " "))]',
// type and attribute value with | (either exact value match or prefix followed by a hyphen)
'/([\\w\\*]+)\\[(\\w+)[\\s]*\\|\\=[\\s]*[\'"]?([\\w-_\\s\\/]+)[\'"]?\\]/'
=> '\\1[@\\2="\\3" or starts-with(@\\2, concat("\\3", "-"))]',
// type and attribute value with ^ (prefix match)
'/([\\w\\*]+)\\[(\\w+)[\\s]*\\^\\=[\\s]*[\'"]?([\\w-_\\/]+)[\'"]?\\]/' => '\\1[starts-with(@\\2, "\\3")]',
// type and attribute value with * (substring match)
'/([\\w\\*]+)\\[(\\w+)[\\s]*\\*\\=[\\s]*[\'"]?([\\w-_\\s\\/:;]+)[\'"]?\\]/' => '\\1[contains(@\\2, "\\3")]',
// adjacent sibling
'/\\s*\\+\\s*/' => '/following-sibling::*[1]/self::',
// child
'/\\s*>\\s*/' => '/',
// descendant (don't match spaces within already translated XPath predicates)
'/\\s+(?![^\\[\\]]*+\\])/' => '//',
// type and :first-child
'/([^\\/]+):first-child/i' => '*[1]/self::\\1',
// type and :last-child
'/([^\\/]+):last-child/i' => '*[last()]/self::\\1',
// The following matcher will break things if it is placed before the adjacent matcher.
// So one of the matchers matches either too much or not enough.
// type and attribute value with $ (suffix match)
'/([\\w\\*]+)\\[(\\w+)[\\s]*\\$\\=[\\s]*[\'"]?([\\w-_\\s\\/]+)[\'"]?\\]/'
=> '\\1[substring(@\\2, string-length(@\\2) - string-length("\\3") + 1) = "\\3"]',
];
/**
* Determines whether CSS styles that have an equivalent HTML attribute
* should be mapped and attached to those elements.
*
* @var bool
*/
private $shouldMapCssToHtml = false;
/**
* This multi-level array contains simple mappings of CSS properties to
* HTML attributes. If a mapping only applies to certain HTML nodes or
* only for certain values, the mapping is an object with a whitelist
* of nodes and values.
*
* @var mixed[][]
*/
private $cssToHtmlMap = [
'background-color' => [
'attribute' => 'bgcolor',
],
'text-align' => [
'attribute' => 'align',
'nodes' => ['p', 'div', 'td'],
'values' => ['left', 'right', 'center', 'justify'],
],
'float' => [
'attribute' => 'align',
'nodes' => ['table', 'img'],
'values' => ['left', 'right'],
],
'border-spacing' => [
'attribute' => 'cellspacing',
'nodes' => ['table'],
],
];
/**
* Emogrifier will throw Exceptions when it encounters an error instead of silently ignoring them.
*
* @var bool
*/
private $debug = false;
/**
* The constructor.
*
* @param string $html the HTML to emogrify, must be UTF-8-encoded
* @param string $css the CSS to merge, must be UTF-8-encoded
*/
public function __construct($html = '', $css = '')
{
$this->setHtml($html);
$this->setCss($css);
}
/**
* The destructor.
*/
public function __destruct()
{
$this->purgeVisitedNodes();
}
/**
* Sets the HTML to emogrify.
*
* @param string $html the HTML to emogrify, must be UTF-8-encoded
*
* @return void
*/
public function setHtml($html)
{
$this->html = $html;
}
/**
* Sets the CSS to merge with the HTML.
*
* @param string $css the CSS to merge, must be UTF-8-encoded
*
* @return void
*/
public function setCss($css)
{
$this->css = $css;
}
/**
* Applies $this->css to $this->html and returns the HTML with the CSS
* applied.
*
* This method places the CSS inline.
*
* @return string
*
* @throws \BadMethodCallException
*/
public function emogrify()
{
return $this->createAndProcessXmlDocument()->saveHTML();
}
/**
* Applies $this->css to $this->html and returns only the HTML content
* within the <body> tag.
*
* This method places the CSS inline.
*
* @return string
*
* @throws \BadMethodCallException
*/
public function emogrifyBodyContent()
{
$xmlDocument = $this->createAndProcessXmlDocument();
$bodyNodeHtml = $xmlDocument->saveHTML($this->getBodyElement($xmlDocument));
return str_replace(['<body>', '</body>'], '', $bodyNodeHtml);
}
/**
* Creates an XML document from $this->html and emogrifies ist.
*
* @return \DOMDocument
*
* @throws \BadMethodCallException
*/
private function createAndProcessXmlDocument()
{
if ($this->html === '') {
throw new \BadMethodCallException('Please set some HTML first.', 1390393096);
}
$xmlDocument = $this->createRawXmlDocument();
$this->ensureExistenceOfBodyElement($xmlDocument);
$this->process($xmlDocument);
return $xmlDocument;
}
/**
* Applies $this->css to $xmlDocument.
*
* This method places the CSS inline.
*
* @param \DOMDocument $xmlDocument
*
* @return void
*
* @throws \InvalidArgumentException
*/
protected function process(\DOMDocument $xmlDocument)
{
$xPath = new \DOMXPath($xmlDocument);
$this->clearAllCaches();
$this->purgeVisitedNodes();
set_error_handler([$this, 'handleXpathQueryWarnings'], E_WARNING);
$this->normalizeStyleAttributesOfAllNodes($xPath);
// grab any existing style blocks from the html and append them to the existing CSS
// (these blocks should be appended so as to have precedence over conflicting styles in the existing CSS)
$allCss = $this->css;
if ($this->isStyleBlocksParsingEnabled) {
$allCss .= $this->getCssFromAllStyleNodes($xPath);
}
$excludedNodes = $this->getNodesToExclude($xPath);
$cssRules = $this->parseCssRules($allCss);
foreach ($cssRules['inlineable'] as $cssRule) {
// There's no real way to test "PHP Warning" output generated by the following XPath query unless PHPUnit
// converts it to an exception. Unfortunately, this would only apply to tests and not work for production
// executions, which can still flood logs/output unnecessarily. Instead, Emogrifier's error handler should
// always throw an exception and it must be caught here and only rethrown if in debug mode.
try {
// \DOMXPath::query will always return a DOMNodeList or an exception when errors are caught.
$nodesMatchingCssSelectors = $xPath->query($this->translateCssToXpath($cssRule['selector']));
} catch (\InvalidArgumentException $e) {
if ($this->debug) {
throw $e;
}
continue;
}
/** @var \DOMElement $node */
foreach ($nodesMatchingCssSelectors as $node) {
if (in_array($node, $excludedNodes, true)) {
continue;
}
// if it has a style attribute, get it, process it, and append (overwrite) new stuff
if ($node->hasAttribute('style')) {
// break it up into an associative array
$oldStyleDeclarations = $this->parseCssDeclarationsBlock($node->getAttribute('style'));
} else {
$oldStyleDeclarations = [];
}
$newStyleDeclarations = $this->parseCssDeclarationsBlock($cssRule['declarationsBlock']);
$node->setAttribute(
'style',
$this->generateStyleStringFromDeclarationsArrays($oldStyleDeclarations, $newStyleDeclarations)
);
}
}
if ($this->isInlineStyleAttributesParsingEnabled) {
$this->fillStyleAttributesWithMergedStyles();
}
if ($this->shouldMapCssToHtml) {
$this->mapAllInlineStylesToHtmlAttributes($xPath);
}
if ($this->shouldRemoveInvisibleNodes) {
$this->removeInvisibleNodes($xPath);
}
$this->removeImportantAnnotationFromAllInlineStyles($xPath);
$this->copyUninlineableCssToStyleNode($xmlDocument, $xPath, $cssRules['uninlineable']);
restore_error_handler();
}
/**
* Searches for all nodes with a style attribute, transforms the CSS found
* to HTML attributes and adds those attributes to each node.
*
* @param \DOMXPath $xPath
*
* @return void
*/
private function mapAllInlineStylesToHtmlAttributes(\DOMXPath $xPath)
{
/** @var \DOMElement $node */
foreach ($this->getAllNodesWithStyleAttribute($xPath) as $node) {
$inlineStyleDeclarations = $this->parseCssDeclarationsBlock($node->getAttribute('style'));
$this->mapCssToHtmlAttributes($inlineStyleDeclarations, $node);
}
}
/**
* Searches for all nodes with a style attribute and removes the "!important" annotations out of
* the inline style declarations, eventually by rearranging declarations.
*
* @param \DOMXPath $xPath
*
* @return void
*/
private function removeImportantAnnotationFromAllInlineStyles(\DOMXPath $xPath)
{
foreach ($this->getAllNodesWithStyleAttribute($xPath) as $node) {
$this->removeImportantAnnotationFromNodeInlineStyle($node);
}
}
/**
* Removes the "!important" annotations out of the inline style declarations,
* eventually by rearranging declarations.
* Rearranging needed when !important shorthand properties are followed by some of their
* not !important expanded-version properties.
* For example "font: 12px serif !important; font-size: 13px;" must be reordered
* to "font-size: 13px; font: 12px serif;" in order to remain correct.
*
* @param \DOMElement $node
*
* @return void
*/
private function removeImportantAnnotationFromNodeInlineStyle(\DOMElement $node)
{
$inlineStyleDeclarations = $this->parseCssDeclarationsBlock($node->getAttribute('style'));
$regularStyleDeclarations = [];
$importantStyleDeclarations = [];
foreach ($inlineStyleDeclarations as $property => $value) {
if ($this->attributeValueIsImportant($value)) {
$importantStyleDeclarations[$property] = trim(str_replace('!important', '', $value));
} else {
$regularStyleDeclarations[$property] = $value;
}
}
$inlineStyleDeclarationsInNewOrder = array_merge(
$regularStyleDeclarations,
$importantStyleDeclarations
);
$node->setAttribute(
'style',
$this->generateStyleStringFromSingleDeclarationsArray($inlineStyleDeclarationsInNewOrder)
);
}
/**
* Returns a list with all DOM nodes that have a style attribute.
*
* @param \DOMXPath $xPath
*
* @return \DOMNodeList
*/
private function getAllNodesWithStyleAttribute(\DOMXPath $xPath)
{
return $xPath->query('//*[@style]');
}
/**
* Applies $styles to $node.
*
* This method maps CSS styles to HTML attributes and adds those to the
* node.
*
* @param string[] $styles the new CSS styles taken from the global styles to be applied to this node
* @param \DOMElement $node node to apply styles to
*
* @return void
*/
private function mapCssToHtmlAttributes(array $styles, \DOMElement $node)
{
foreach ($styles as $property => $value) {
// Strip !important indicator
$value = trim(str_replace('!important', '', $value));
$this->mapCssToHtmlAttribute($property, $value, $node);
}
}
/**
* Tries to apply the CSS style to $node as an attribute.
*
* This method maps a CSS rule to HTML attributes and adds those to the node.
*
* @param string $property the name of the CSS property to map
* @param string $value the value of the style rule to map
* @param \DOMElement $node node to apply styles to
*
* @return void
*/
private function mapCssToHtmlAttribute($property, $value, \DOMElement $node)
{
if (!$this->mapSimpleCssProperty($property, $value, $node)) {
$this->mapComplexCssProperty($property, $value, $node);
}
}
/**
* Looks up the CSS property in the mapping table and maps it if it matches the conditions.
*
* @param string $property the name of the CSS property to map
* @param string $value the value of the style rule to map
* @param \DOMElement $node node to apply styles to
*
* @return bool true if the property cab be mapped using the simple mapping table
*/
private function mapSimpleCssProperty($property, $value, \DOMElement $node)
{
if (!isset($this->cssToHtmlMap[$property])) {
return false;
}
$mapping = $this->cssToHtmlMap[$property];
$nodesMatch = !isset($mapping['nodes']) || in_array($node->nodeName, $mapping['nodes'], true);
$valuesMatch = !isset($mapping['values']) || in_array($value, $mapping['values'], true);
if (!$nodesMatch || !$valuesMatch) {
return false;
}
$node->setAttribute($mapping['attribute'], $value);
return true;
}
/**
* Maps CSS properties that need special transformation to an HTML attribute.
*
* @param string $property the name of the CSS property to map
* @param string $value the value of the style rule to map
* @param \DOMElement $node node to apply styles to
*
* @return void
*/
private function mapComplexCssProperty($property, $value, \DOMElement $node)
{
$nodeName = $node->nodeName;
$isTable = $nodeName === 'table';
$isImage = $nodeName === 'img';
$isTableOrImage = $isTable || $isImage;
switch ($property) {
case 'background':
// Parse out the color, if any
$styles = explode(' ', $value);
$first = $styles[0];
if (!is_numeric($first[0]) && strpos($first, 'url') !== 0) {
// This is not a position or image, assume it's a color
$node->setAttribute('bgcolor', $first);
}
break;
case 'width':
// intentional fall-through
case 'height':
// Only parse values in px and %, but not values like "auto".
if (preg_match('/^\d+(px|%)$/', $value)) {
// Remove 'px'. This regex only conserves numbers and %
$number = preg_replace('/[^0-9.%]/', '', $value);
$node->setAttribute($property, $number);
}
break;
case 'margin':
if ($isTableOrImage) {
$margins = $this->parseCssShorthandValue($value);
if ($margins['left'] === 'auto' && $margins['right'] === 'auto') {
$node->setAttribute('align', 'center');
}
}
break;
case 'border':
if ($isTableOrImage && ($value === 'none' || $value === '0')) {
$node->setAttribute('border', '0');
}
break;
default:
}
}
/**
* Parses a shorthand CSS value and splits it into individual values
*
* @param string $value a string of CSS value with 1, 2, 3 or 4 sizes
* For example: padding: 0 auto;
* '0 auto' is split into top: 0, left: auto, bottom: 0,
* right: auto.
*
* @return string[] an array of values for top, right, bottom and left (using these as associative array keys)
*/
private function parseCssShorthandValue($value)
{
$values = preg_split('/\\s+/', $value);
$css = [];
$css['top'] = $values[0];
$css['right'] = (count($values) > 1) ? $values[1] : $css['top'];
$css['bottom'] = (count($values) > 2) ? $values[2] : $css['top'];
$css['left'] = (count($values) > 3) ? $values[3] : $css['right'];
return $css;
}
/**
* Extracts and parses the individual rules from a CSS string.
*
* @param string $css a string of raw CSS code
*
* @return string[][][] A 2-entry array with the key "inlineable" containing rules which can be inlined as `style`
* attributes and the key "uninlineable" containing rules which cannot. Each value is an array of string
* sub-arrays with the keys
* "media" (the media query string, e.g. "@media screen and (max-width: 480px)",
* or an empty string if not from a `@media` rule),
* "selector" (the CSS selector(s), e.g., "*" or "h1"),
* "declarationsBLock" (the semicolon-separated CSS declarations for that selector(s),
* e.g., "color: red; height: 4px;"),
* and "line" (the line number e.g. 42)
*/
private function parseCssRules($css)
{
$cssKey = md5($css);
if (!isset($this->caches[static::CACHE_KEY_CSS][$cssKey])) {
$matches = $this->getCssRuleMatches($css);
$cssRules = [
'inlineable' => [],
'uninlineable' => [],
];
/** @var string[][] $matches */
/** @var string[] $cssRule */
foreach ($matches as $key => $cssRule) {
$cssDeclaration = trim($cssRule['declarations']);
if ($cssDeclaration === '') {
continue;
}
$selectors = explode(',', $cssRule['selectors']);
foreach ($selectors as $selector) {
// don't process pseudo-elements and behavioral (dynamic) pseudo-classes;
// only allow structural pseudo-classes
$hasPseudoElement = strpos($selector, '::') !== false;
$hasAnyPseudoClass = (bool)preg_match('/:[a-zA-Z]/', $selector);
$hasSupportedPseudoClass = (bool)preg_match(
'/:(\\S+\\-(child|type\\()|not\\([[:ascii:]]*\\))/i',
$selector
);
if ($hasPseudoElement || ($hasAnyPseudoClass && !$hasSupportedPseudoClass)) {
continue;
}
$parsedCssRule = [
'media' => $cssRule['media'],
'selector' => trim($selector),
'declarationsBlock' => $cssDeclaration,
// keep track of where it appears in the file, since order is important
'line' => $key,
];
$ruleType = ($cssRule['media'] === '') ? 'inlineable' : 'uninlineable';
$cssRules[$ruleType][] = $parsedCssRule;
}
}
usort($cssRules['inlineable'], [$this, 'sortBySelectorPrecedence']);
$this->caches[static::CACHE_KEY_CSS][$cssKey] = $cssRules;
}
return $this->caches[static::CACHE_KEY_CSS][$cssKey];
}
/**
* Parses a string of CSS into the media query, selectors and declarations for each ruleset in order.
*
* @param string $css
*
* @return string[][] Array of string sub-arrays with the keys
* "media" (the media query string, e.g. "@media screen and (max-width: 480px)",
* or an empty string if not from an `@media` rule),
* "selectors" (the CSS selector(s), e.g., "*" or "h1, h2"),
* "declarations" (the semicolon-separated CSS declarations for that/those selector(s),
* e.g., "color: red; height: 4px;"),
*/
private function getCssRuleMatches($css)
{
$ruleMatches = [];
$splitCss = $this->splitCssAndMediaQuery($css);
foreach ($splitCss as $cssPart) {
// process each part for selectors and definitions
preg_match_all('/(?:^|[\\s^{}]*)([^{]+){([^}]*)}/mi', $cssPart['css'], $matches, PREG_SET_ORDER);
foreach ($matches as $cssRule) {
$ruleMatches[] = [
'media' => $cssPart['media'],
'selectors' => $cssRule[1],
'declarations' => $cssRule[2],
];
}
}
return $ruleMatches;
}
/**
* Disables the parsing of inline styles.
*
* @return void
*/
public function disableInlineStyleAttributesParsing()
{
$this->isInlineStyleAttributesParsingEnabled = false;
}
/**
* Disables the parsing of <style> blocks.
*
* @return void
*/
public function disableStyleBlocksParsing()
{
$this->isStyleBlocksParsingEnabled = false;
}
/**
* Disables the removal of elements with `display: none` properties.
*
* @deprecated will be removed in Emogrifier 3.0
*
* @return void
*/
public function disableInvisibleNodeRemoval()
{
$this->shouldRemoveInvisibleNodes = false;
}
/**
* Enables the attachment/override of HTML attributes for which a
* corresponding CSS property has been set.
*
* @deprecated will be removed in Emogrifier 3.0
*
* @return void
*/
public function enableCssToHtmlMapping()
{
$this->shouldMapCssToHtml = true;
}
/**
* Clears all caches.
*
* @return void
*/
private function clearAllCaches()
{
$this->clearCache(static::CACHE_KEY_CSS);
$this->clearCache(static::CACHE_KEY_SELECTOR);
$this->clearCache(static::CACHE_KEY_XPATH);
$this->clearCache(static::CACHE_KEY_CSS_DECLARATIONS_BLOCK);
$this->clearCache(static::CACHE_KEY_COMBINED_STYLES);
}
/**
* Clears a single cache by key.
*
* @param int $key the cache key, must be CACHE_KEY_CSS, CACHE_KEY_SELECTOR, CACHE_KEY_XPATH
* or CACHE_KEY_CSS_DECLARATION_BLOCK
*
* @return void
*
* @throws \InvalidArgumentException
*/
private function clearCache($key)
{
$allowedCacheKeys = [
static::CACHE_KEY_CSS,
static::CACHE_KEY_SELECTOR,
static::CACHE_KEY_XPATH,
static::CACHE_KEY_CSS_DECLARATIONS_BLOCK,
static::CACHE_KEY_COMBINED_STYLES,
];
if (!in_array($key, $allowedCacheKeys, true)) {
throw new \InvalidArgumentException('Invalid cache key: ' . $key, 1391822035);
}
$this->caches[$key] = [];
}
/**
* Purges the visited nodes.
*
* @return void
*/
private function purgeVisitedNodes()
{
$this->visitedNodes = [];
$this->styleAttributesForNodes = [];
}
/**
* Marks a tag for removal.
*
* There are some HTML tags that DOMDocument cannot process, and it will throw an error if it encounters them.
* In particular, DOMDocument will complain if you try to use HTML5 tags in an XHTML document.
*
* Note: The tags will not be removed if they have any content.
*
* @param string $tagName the tag name, e.g., "p"
*
* @return void
*/
public function addUnprocessableHtmlTag($tagName)
{
$this->unprocessableHtmlTags[] = $tagName;
}
/**
* Drops a tag from the removal list.
*
* @param string $tagName the tag name, e.g., "p"
*
* @return void
*/
public function removeUnprocessableHtmlTag($tagName)
{
$key = array_search($tagName, $this->unprocessableHtmlTags, true);
if ($key !== false) {
unset($this->unprocessableHtmlTags[$key]);
}
}
/**
* Marks a media query type to keep.
*
* @param string $mediaName the media type name, e.g., "braille"
*
* @return void
*/
public function addAllowedMediaType($mediaName)
{
$this->allowedMediaTypes[$mediaName] = true;
}
/**
* Drops a media query type from the allowed list.
*
* @param string $mediaName the tag name, e.g., "braille"
*
* @return void
*/
public function removeAllowedMediaType($mediaName)
{
if (isset($this->allowedMediaTypes[$mediaName])) {
unset($this->allowedMediaTypes[$mediaName]);
}
}
/**
* Adds a selector to exclude nodes from emogrification.
*
* Any nodes that match the selector will not have their style altered.
*
* @param string $selector the selector to exclude, e.g., ".editor"
*
* @return void
*/
public function addExcludedSelector($selector)
{
$this->excludedSelectors[$selector] = true;
}
/**
* No longer excludes the nodes matching this selector from emogrification.
*
* @param string $selector the selector to no longer exclude, e.g., ".editor"
*
* @return void
*/
public function removeExcludedSelector($selector)
{
if (isset($this->excludedSelectors[$selector])) {
unset($this->excludedSelectors[$selector]);
}
}
/**
* This removes styles from your email that contain display:none.
* We need to look for display:none, but we need to do a case-insensitive search. Since DOMDocument only
* supports XPath 1.0, lower-case() isn't available to us. We've thus far only set attributes to lowercase,
* not attribute values. Consequently, we need to translate() the letters that would be in 'NONE' ("NOE")
* to lowercase.
*
* @param \DOMXPath $xPath
*
* @return void
*/
private function removeInvisibleNodes(\DOMXPath $xPath)
{
$nodesWithStyleDisplayNone = $xPath->query(
'//*[contains(translate(translate(@style," ",""),"NOE","noe"),"display:none")]'
);
if ($nodesWithStyleDisplayNone->length === 0) {
return;
}
// The checks on parentNode and is_callable below ensure that if we've deleted the parent node,
// we don't try to call removeChild on a nonexistent child node
/** @var \DOMNode $node */
foreach ($nodesWithStyleDisplayNone as $node) {
if ($node->parentNode && is_callable([$node->parentNode, 'removeChild'])) {
$node->parentNode->removeChild($node);
}
}
}
/**
* Parses the document and normalizes all existing CSS attributes.
* This changes 'DISPLAY: none' to 'display: none'.
* We wouldn't have to do this if DOMXPath supported XPath 2.0.
* Also stores a reference of nodes with existing inline styles so we don't overwrite them.
*
* @param \DOMXPath $xPath
*
* @return void
*/
private function normalizeStyleAttributesOfAllNodes(\DOMXPath $xPath)
{
/** @var \DOMElement $node */
foreach ($this->getAllNodesWithStyleAttribute($xPath) as $node) {
if ($this->isInlineStyleAttributesParsingEnabled) {
$this->normalizeStyleAttributes($node);
}
// Remove style attribute in every case, so we can add them back (if inline style attributes
// parsing is enabled) to the end of the style list, thus keeping the right priority of CSS rules;
// else original inline style rules may remain at the beginning of the final inline style definition
// of a node, which may give not the desired results
$node->removeAttribute('style');
}
}
/**
* Normalizes the value of the "style" attribute and saves it.
*
* @param \DOMElement $node
*
* @return void
*/
private function normalizeStyleAttributes(\DOMElement $node)
{
$normalizedOriginalStyle = preg_replace_callback(
'/[A-z\\-]+(?=\\:)/S',