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<?php
/*
UPDATES
2008-08-10 Fixed CSS comment stripping regex to add PCRE_DOTALL (changed from '/\/\*.*\*\//U' to '/\/\*.*\*\//sU')
2008-08-18 Added lines instructing DOMDocument to attempt to normalize HTML before processing
2008-10-20 Fixed bug with bad variable name... Thanks Thomas!
2008-03-02 Added licensing terms under the MIT License
Only remove unprocessable HTML tags if they exist in the array
2009-06-03 Normalize existing CSS (style) attributes in the HTML before we process the CSS.
Made it so that the display:none stripper doesn't require a trailing semi-colon.
2009-08-13 Added support for subset class values (e.g. "p.class1.class2").
Added better protection for bad css attributes.
Fixed support for HTML entities.
2009-08-17 Fixed CSS selector processing so that selectors are processed by precedence/specificity, and not just in order.
2009-10-29 Fixed so that selectors appearing later in the CSS will have precedence over identical selectors appearing earlier.
2009-11-04 Explicitly declared static functions static to get rid of E_STRICT notices.
2010-05-18 Fixed bug where full url filenames with protocols wouldn't get split improperly when we explode on ':'... Thanks Mark!
Added two new attribute selectors
2010-06-16 Added static caching for less processing overhead in situations where multiple emogrification takes place
2010-07-26 Fixed bug where '0' values were getting discarded because of php's empty() function... Thanks Scott!
2010-09-03 Added checks to invisible node removal to ensure that we don't try to remove non-existent child nodes of parents that have already been deleted
*/
class TjEmogrifier
{
private $html = '';
private $css = '';
private $unprocessableHTMLTags = array('wbr');
public function __construct($html = '', $css = '')
{
$this->html = $html;
$this->css = $css;
}
public function setHTML($html = '')
{
$this->html = $html;
}
public function setCSS($css = '')
{
$this->css = $css;
}
// There are some HTML tags that DOMDocument cannot process, and will throw an error if it encounters them.
// These functions allow you to add/remove them if necessary.
//It only strips them from the code (does not remove actual nodes).
public function addUnprocessableHTMLTag($tag)
{
$this->unprocessableHTMLTags[] = $tag;
}
public function removeUnprocessableHTMLTag($tag)
{
if (($key = array_search($tag,$this->unprocessableHTMLTags)) !== false)
{
unset($this->unprocessableHTMLTags[$key]);
}
}
// Applies the CSS you submit to the html you submit. places the css inline
public function emogrify()
{
$body = $this->html;
// Process the CSS here, turning the CSS style blocks into inline css
if (count($this->unprocessableHTMLTags))
{
$unprocessableHTMLTags = implode('|', $this->unprocessableHTMLTags);
$body = preg_replace("/<($unprocessableHTMLTags)[^>]*>/i", '', $body);
}
$encoding = mb_detect_encoding($body);
$body = mb_convert_encoding($body, 'HTML-ENTITIES', $encoding);
$xmldoc = new DOMDocument;
$xmldoc->encoding = $encoding;
$xmldoc->strictErrorChecking = false;
$xmldoc->formatOutput = true;
@$xmldoc->loadHTML($body);
$xmldoc->normalizeDocument();
$xpath = new DOMXPath($xmldoc);
// Before be begin processing the CSS file, parse the document and normalize all existing CSS attributes (changes 'DISPLAY: none' to 'display: none');
// We wouldn't have to do this if DOMXPath supported XPath 2.0.
$nodes = @$xpath->query('//*[@style]');
// Snehal - Change for Bug #60937
// If ($nodes->length > 0) foreach ($nodes as $node) $node->setAttribute('style',preg_replace('/[A-z\-]+(?=\:)/Se',"strtolower('\\0')",$node->getAttribute('style')));
if ($nodes->length > 0)
foreach ($nodes as $node)
{
$result = preg_replace_callback("/[A-z\-]+(?=\:)/S",
function($m)
{
return strtolower($m[0]);
},
$node->getAttribute('style')
);
$node->setAttribute('style', $result);
}
// Get rid of css comment code
$re_commentCSS = '/\/\*.*\*\//sU';
$css = preg_replace($re_commentCSS,'',$this->css);
static $csscache = array();
$csskey = md5($css);
if (!isset($csscache[$csskey]))
{
// Process the CSS file for selectors and definitions
$re_CSS = '/^\s*([^{]+){([^}]+)}/mis';
preg_match_all($re_CSS, $css, $matches);
$all_selectors = array();
foreach ($matches[1] as $key => $selectorString)
{
// If there is a blank definition, skip
if (!strlen(trim($matches[2][$key]))) continue;
// Else split by commas and duplicate attributes so we can sort by selector precedence
$selectors = explode(',',$selectorString);
foreach ($selectors as $selector)
{
// Don't process pseudo-classes
if (strpos($selector,':') !== false) continue;
$all_selectors[] = array('selector' => $selector,
'attributes' => $matches[2][$key],
'index' => $key,
// Keep track of where it appears in the file, since order is important
);
}
}
// Now sort the selectors by precedence
usort($all_selectors, array('self','sortBySelectorPrecedence'));
$csscache[$csskey] = $all_selectors;
}
foreach ($csscache[$csskey] as $value)
{
// Query the body for the xpath selector
$nodes = $xpath->query($this->translateCSStoXpath(trim($value['selector'])));
if($nodes)
foreach($nodes as $node)
{
// If it has a style attribute, get it, process it, and append (overwrite) new stuff
if ($node->hasAttribute('style'))
{
// Break it up into an associative array
$oldStyleArr = $this->cssStyleDefinitionToArray($node->getAttribute('style'));
$newStyleArr = $this->cssStyleDefinitionToArray($value['attributes']);
// New styles overwrite the old styles (not technically accurate, but close enough)
$combinedArr = array_merge($oldStyleArr,$newStyleArr);
$style = '';
foreach ($combinedArr as $k => $v) $style .= (strtolower($k) . ':' . $v . ';');
}
else
{
// Otherwise create a new style
$style = trim($value['attributes']);
}
$node->setAttribute('style',$style);
}
}
// This removes styles from your email that contain display:none. You could comment these out if you want.
$nodes = $xpath->query('//*[contains(translate(@style," ",""),"display:none")]');
// The checks on parentNode and is_callable below are there to ensure that if we've deleted the parent node,
// We don't try to call removeChild on a nonexistent child node
if ($nodes->length > 0) foreach ($nodes as $node) if ($node->parentNode && is_callable(array($node->parentNode,'removeChild'))) $node->parentNode->removeChild($node);
return $xmldoc->saveHTML();
}
private static function sortBySelectorPrecedence($a, $b)
{
$precedenceA = self::getCSSSelectorPrecedence($a['selector']);
$precedenceB = self::getCSSSelectorPrecedence($b['selector']);
// We want these sorted ascendingly so selectors with lesser precedence get processed first and
// Selectors with greater precedence get sorted last
return ($precedenceA == $precedenceB) ? ($a['index'] < $b['index'] ? -1 : 1) : ($precedenceA < $precedenceB ? -1 : 1);
}
private static function getCSSSelectorPrecedence($selector)
{
static $selectorcache = array();
$selectorkey = md5($selector);
if (!isset($selectorcache[$selectorkey]))
{
$precedence = 0;
$value = 100;
$search = array('\#', '\.', ''); // ids: worth 100, classes: worth 10, elements: worth 1
foreach ($search as $s)
{
if (trim($selector == '')) break;
$num = 0;
$selector = preg_replace('/' . $s . '\w+/', '', $selector, -1, $num);
$precedence += ($value * $num);
$value /= 10;
}
$selectorcache[$selectorkey] = $precedence;
}
return $selectorcache[$selectorkey];
}
// Right now we support all CSS 1 selectors and /some/ CSS2/3 selectors.
// http://plasmasturm.org/log/444/
private function translateCSStoXpath($css_selector)
{
$css_selector = trim($css_selector);
static $xpathcache = array();
$xpathkey = md5($css_selector);
if (!isset($xpathcache[$xpathkey]))
{
// Returns an Xpath selector
$search = array(
'/\s+>\s+/', // Matches any F element that is a child of an element E.
'/(\w+)\s+\+\s+(\w+)/', // Matches any F element that is a child of an element E.
'/\s+/', // Matches any F element that is a descendant of an E element.
'/(\w)\[(\w+)\]/', // Matches element with attribute
'/(\w)\[(\w+)\=[\'"]?(\w+)[\'"]?\]/', // Matches element with EXACT attribute
'/(\w+)?\#([\w\-]+)/e', // Matches id attributes
'/(\w+|\*)?((\.[\w\-]+)+)/e', // Matches class attributes
);
$replace = array(
'/',
'\\1/following-sibling::*[1]/self::\\2',
'//',
'\\1[@\\2]',
'\\1[@\\2="\\3"]',
"(strlen('\\1') ? '\\1' : '*').'[@id=\"\\2\"]'",
"(strlen('\\1') ? '\\1' : '*').'[contains(concat(\" \",@class,\" \"),concat(\" \",\"'.implode('\",\" \"))][contains(concat(\" \",@class,\" \"),concat(\" \",\"',explode('.',substr('\\2',1))).'\",\" \"))]'",
);
$xpathcache[$xpathkey] = '//' . preg_replace($search,$replace,$css_selector);
}
return $xpathcache[$xpathkey];
}
private function cssStyleDefinitionToArray($style)
{
$definitions = explode(';', $style);
$retArr = array();
foreach ($definitions as $def)
{
if (empty($def) || strpos($def, ':') === false) continue;
list($key,$value) = explode(':', $def, 2);
if (empty($key) || strlen(trim($value)) === 0) continue;
$retArr[trim($key)] = trim($value);
}
return $retArr;
}
}