| 1 | <?php |
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| 2 | |
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| 3 | /** |
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| 4 | * CSS to Inline Styles class |
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| 5 | * |
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| 6 | * This source file can be used to convert HTML with CSS into HTML with inline styles |
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| 7 | * |
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| 8 | * Known issues: |
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| 9 | * - no support for pseudo selectors |
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| 10 | * |
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| 11 | * The class is documented in the file itself. If you find any bugs help me out and report them. Reporting can be done by sending an email to php-css-to-inline-styles-bugs[at]verkoyen[dot]eu. |
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| 12 | * If you report a bug, make sure you give me enough information (include your code). |
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| 13 | * |
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| 14 | * Changelog since 1.0.2 |
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| 15 | * - .class are matched from now on. |
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| 16 | * - fixed issue with #id |
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| 17 | * - new beta-feature: added a way to output valid XHTML (thx to Matt Hornsby) |
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| 18 | * |
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| 19 | * Changelog since 1.0.1 |
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| 20 | * - fixed some stuff on specifity |
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| 21 | * |
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| 22 | * Changelog since 1.0.0 |
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| 23 | * - rewrote the buildXPathQuery-method |
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| 24 | * - fixed some stuff on specifity |
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| 25 | * - added a way to use inline style-blocks |
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| 26 | * |
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| 27 | * License |
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| 28 | * Copyright (c) 2010, Tijs Verkoyen. All rights reserved. |
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| 29 | * |
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| 30 | * Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: |
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| 31 | * |
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| 32 | * 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. |
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| 33 | * 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. |
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| 34 | * 3. The name of the author may not be used to endorse or promote products derived from this software without specific prior written permission. |
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| 35 | * |
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| 36 | * This software is provided by the author "as is" and any express or implied warranties, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose are disclaimed. In no event shall the author be liable for any direct, indirect, incidental, special, exemplary, or consequential damages (including, but not limited to, procurement of substitute goods or services; loss of use, data, or profits; or business interruption) however caused and on any theory of liability, whether in contract, strict liability, or tort (including negligence or otherwise) arising in any way out of the use of this software, even if advised of the possibility of such damage. |
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| 37 | * |
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| 38 | * @author Tijs Verkoyen <php-css-to-inline-styles@verkoyen.eu> |
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| 39 | * @version 1.0.3 |
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| 40 | * |
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| 41 | * @copyright Copyright (c) 2010, Tijs Verkoyen. All rights reserved. |
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| 42 | * @license BSD License |
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| 43 | */ |
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| 44 | class CSSToInlineStyles |
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| 45 | { |
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| 46 | /** |
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| 47 | * The CSS to use |
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| 48 | * |
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| 49 | * @var string |
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| 50 | */ |
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| 51 | private $css; |
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| 52 | |
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| 53 | |
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| 54 | /** |
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| 55 | * The processed CSS rules |
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| 56 | * |
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| 57 | * @var array |
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| 58 | */ |
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| 59 | private $cssRules; |
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| 60 | |
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| 61 | |
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| 62 | /** |
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| 63 | * Should the generated HTML be cleaned |
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| 64 | * |
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| 65 | * @var bool |
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| 66 | */ |
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| 67 | private $cleanup = false; |
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| 68 | |
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| 69 | |
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| 70 | /** |
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| 71 | * The HTML to process |
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| 72 | * |
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| 73 | * @var string |
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| 74 | */ |
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| 75 | private $html; |
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| 76 | |
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| 77 | |
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| 78 | /** |
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| 79 | * Use inline-styles block as CSS |
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| 80 | * |
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| 81 | * @var bool |
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| 82 | */ |
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| 83 | private $useInlineStylesBlock = false; |
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| 84 | |
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| 85 | |
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| 86 | /** |
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| 87 | * Creates an instance, you could set the HTML and CSS here, or load it later. |
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| 88 | * |
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| 89 | * @return void |
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| 90 | * @param string[optional] $html The HTML to process |
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| 91 | * @param string[optional] $css The CSS to use |
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| 92 | */ |
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| 93 | public function __construct($html = null, $css = null) |
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| 94 | { |
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| 95 | if($html !== null) $this->setHTML($html); |
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| 96 | if($css !== null) $this->setCSS($css); |
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| 97 | } |
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| 98 | |
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| 99 | |
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| 100 | /** |
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| 101 | * Convert a CSS-selector into an xPath-query |
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| 102 | * |
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| 103 | * @return string |
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| 104 | * @param string $selector The CSS-selector |
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| 105 | */ |
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| 106 | private function buildXPathQuery($selector) |
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| 107 | { |
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| 108 | // redefine |
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| 109 | $selector = (string) $selector; |
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| 110 | |
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| 111 | // the CSS selector |
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| 112 | $cssSelector = array( '/(\w)\s+(\w)/', // E F Matches any F element that is a descendant of an E element |
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| 113 | '/(\w)\s*>\s*(\w)/', // E > F Matches any F element that is a child of an element E |
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| 114 | '/(\w):first-child/', // E:first-child Matches element E when E is the first child of its parent |
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| 115 | '/(\w)\s*\+\s*(\w)/', // E + F Matches any F element immediately preceded by an element |
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| 116 | '/(\w)\[([\w\-]+)]/', // E[foo] Matches any E element with the "foo" attribute set (whatever the value) |
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| 117 | '/(\w)\[([\w\-]+)\=\"(.*)\"]/', // E[foo="warning"] Matches any E element whose "foo" attribute value is exactly equal to "warning" |
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| 118 | '/(\w+|\*)+\.([\w\-]+)+/', // div.warning HTML only. The same as DIV[class~="warning"] |
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| 119 | '/\.([\w\-]+)/', // .warning HTML only. The same as *[class~="warning"] |
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| 120 | '/(\w+)+\#([\w\-]+)/', // E#myid Matches any E element with id-attribute equal to "myid" |
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| 121 | '/\#([\w\-]+)/' // #myid Matches any element with id-attribute equal to "myid" |
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| 122 | ); |
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| 123 | |
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| 124 | // the xPath-equivalent |
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| 125 | $xPathQuery = array( '\1//\2', // E F Matches any F element that is a descendant of an E element |
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| 126 | '\1/\2', // E > F Matches any F element that is a child of an element E |
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| 127 | '*[1]/self::\1', // E:first-child Matches element E when E is the first child of its parent |
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| 128 | '\1/following-sibling::*[1]/self::\2', // E + F Matches any F element immediately preceded by an element |
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| 129 | '\1 [ @\2 ]', // E[foo] Matches any E element with the "foo" attribute set (whatever the value) |
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| 130 | '\1[ contains( concat( " ", @\2, " " ), concat( " ", "\3", " " ) ) ]', // E[foo="warning"] Matches any E element whose "foo" attribute value is exactly equal to "warning" |
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| 131 | '\1[ contains( concat( " ", @class, " " ), concat( " ", "\2", " " ) ) ]', // div.warning HTML only. The same as DIV[class~="warning"] |
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| 132 | '*[ contains( concat( " ", @class, " " ), concat( " ", "\1", " " ) ) ]', // .warning HTML only. The same as *[class~="warning"] |
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| 133 | '\1[ @id = "\2" ]', // E#myid Matches any E element with id-attribute equal to "myid" |
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| 134 | '*[ @id = "\1" ]' // #myid Matches any element with id-attribute equal to "myid" |
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| 135 | ); |
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| 136 | |
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| 137 | // return |
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| 138 | return (string) '//'. preg_replace($cssSelector, $xPathQuery, $selector); |
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| 139 | } |
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| 140 | |
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| 141 | |
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| 142 | /** |
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| 143 | * Calculate the specifity for the CSS-selector |
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| 144 | * |
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| 145 | * @return int |
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| 146 | * @param string $selector |
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| 147 | */ |
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| 148 | private function calculateCSSSpecifity($selector) |
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| 149 | { |
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| 150 | // cleanup selector |
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| 151 | $selector = str_replace(array('>', '+'), array(' > ', ' + '), $selector); |
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| 152 | |
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| 153 | // init var |
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| 154 | $specifity = 0; |
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| 155 | |
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| 156 | // split the selector into chunks based on spaces |
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| 157 | $chunks = explode(' ', $selector); |
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| 158 | |
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| 159 | // loop chunks |
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| 160 | foreach($chunks as $chunk) |
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| 161 | { |
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| 162 | // an ID is important, so give it a high specifity |
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| 163 | if(strstr($chunk, '#') !== false) $specifity += 100; |
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| 164 | |
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| 165 | // classes are more important than a tag, but less important then an ID |
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| 166 | elseif(strstr($chunk, '.')) $specifity += 10; |
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| 167 | |
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| 168 | // anything else isn't that important |
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| 169 | else $specifity += 1; |
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| 170 | } |
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| 171 | |
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| 172 | // return |
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| 173 | return $specifity; |
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| 174 | } |
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| 175 | |
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| 176 | |
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| 177 | /** |
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| 178 | * Cleanup the generated HTML |
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| 179 | * |
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| 180 | * @return string |
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| 181 | * @param string $html The HTML to cleanup |
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| 182 | */ |
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| 183 | private function cleanupHTML($html) |
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| 184 | { |
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| 185 | // remove classes |
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| 186 | $html = preg_replace('/(\s)+class="(.*)"(\s)+/U', ' ', $html); |
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| 187 | |
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| 188 | // remove IDs |
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| 189 | $html = preg_replace('/(\s)+id="(.*)"(\s)+/U', ' ', $html); |
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| 190 | |
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| 191 | // return |
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| 192 | return $html; |
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| 193 | } |
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| 194 | |
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| 195 | |
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| 196 | /** |
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| 197 | * Converts the loaded HTML into an HTML-string with inline styles based on the loaded CSS |
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| 198 | * |
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| 199 | * @return string |
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| 200 | * @param bool $outputXHTML Should we output valid XHTML? |
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| 201 | */ |
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| 202 | public function convert($outputXHTML = false) |
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| 203 | { |
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| 204 | // redefine |
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| 205 | $outputXHTML = (bool) $outputXHTML; |
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| 206 | |
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| 207 | // validate |
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| 208 | if($this->html == null) throw new CSSToInlineStylesException('No HTML provided.'); |
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| 209 | |
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| 210 | // should we use inline style-block |
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| 211 | if($this->useInlineStylesBlock) |
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| 212 | { |
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| 213 | // init var |
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| 214 | $matches = array(); |
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| 215 | |
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| 216 | // match the style blocks |
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| 217 | preg_match_all('|<style(.*)>(.*)</style>|isU', $this->html, $matches); |
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| 218 | |
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| 219 | // any style-blocks found? |
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| 220 | if(!empty($matches[2])) |
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| 221 | { |
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| 222 | // add |
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| 223 | foreach($matches[2] as $match) $this->css .= trim($match) ."\n"; |
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| 224 | } |
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| 225 | } |
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| 226 | |
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| 227 | // process css |
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| 228 | $this->processCSS(); |
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| 229 | |
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| 230 | // create new DOMDocument |
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| 231 | $document = new DOMDocument(); |
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| 232 | |
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| 233 | // set error level |
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| 234 | libxml_use_internal_errors(true); |
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| 235 | |
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| 236 | // load HTML |
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| 237 | $document->loadHTML($this->html); |
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| 238 | |
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| 239 | // create new XPath |
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| 240 | $xPath = new DOMXPath($document); |
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| 241 | |
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| 242 | // any rules? |
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| 243 | if(!empty($this->cssRules)) |
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| 244 | { |
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| 245 | // loop rules |
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| 246 | foreach($this->cssRules as $rule) |
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| 247 | { |
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| 248 | // init var |
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| 249 | $query = $this->buildXPathQuery($rule['selector']); |
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| 250 | |
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| 251 | // validate query |
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| 252 | if($query === false) continue; |
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| 253 | |
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| 254 | // search elements |
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| 255 | $elements = $xPath->query($query); |
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| 256 | |
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| 257 | // validate elements |
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| 258 | if($elements === false) continue; |
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| 259 | |
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| 260 | // loop found elements |
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| 261 | foreach($elements as $element) |
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| 262 | { |
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| 263 | // init var |
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| 264 | $properties = array(); |
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| 265 | |
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| 266 | // get current styles |
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| 267 | $stylesAttribute = $element->attributes->getNamedItem('style'); |
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| 268 | |
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| 269 | // add new properties into the list |
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| 270 | foreach($rule['properties'] as $key => $value) $properties[$key] = $value; |
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| 271 | |
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| 272 | // any styles defined before? |
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| 273 | if($stylesAttribute !== null) |
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| 274 | { |
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| 275 | // get value for the styles attribute |
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| 276 | $definedStyles = (string) $stylesAttribute->value; |
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| 277 | |
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| 278 | // split into properties |
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| 279 | $definedProperties = (array) explode(';', $definedStyles); |
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| 280 | |
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| 281 | // loop properties |
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| 282 | foreach($definedProperties as $property) |
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| 283 | { |
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| 284 | // validate property |
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| 285 | if($property == '') continue; |
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| 286 | |
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| 287 | // split into chunks |
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| 288 | $chunks = (array) explode(':', trim($property), 2); |
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| 289 | |
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| 290 | // validate |
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| 291 | if(!isset($chunks[1])) continue; |
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| 292 | |
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| 293 | // loop chunks |
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| 294 | $properties[$chunks[0]] = trim($chunks[1]); |
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| 295 | } |
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| 296 | } |
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| 297 | |
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| 298 | |
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| 299 | // build string |
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| 300 | $propertyChunks = array(); |
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| 301 | |
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| 302 | // build chunks |
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| 303 | foreach($properties as $key => $value) $propertyChunks[] = $key .': '. $value .';'; |
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| 304 | |
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| 305 | // build properties string |
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| 306 | $propertiesString = implode(' ', $propertyChunks); |
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| 307 | |
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| 308 | // set attribute |
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| 309 | if($propertiesString != '') $element->setAttribute('style', $propertiesString); |
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| 310 | } |
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| 311 | } |
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| 312 | } |
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| 313 | |
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| 314 | // should we output XHTML? |
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| 315 | if($outputXHTML) |
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| 316 | { |
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| 317 | // set formating |
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| 318 | $document->formatOutput = true; |
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| 319 | |
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| 320 | // get the HTML as XML |
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| 321 | $html = $document->saveXML(null, LIBXML_NOEMPTYTAG); |
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| 322 | |
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| 323 | // remove the XML-header |
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| 324 | $html = str_replace('<?xml version="1.0" encoding="UTF-8" standalone="yes"?>'."\n", '', $html); |
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| 325 | } |
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| 326 | |
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| 327 | // just regular HTML 4.01 as it should be used in newsletters |
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| 328 | else |
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| 329 | { |
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| 330 | // get the HTML |
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| 331 | $html = $document->saveHTML(); |
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| 332 | } |
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| 333 | |
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| 334 | // cleanup the HTML if we need to |
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| 335 | if($this->cleanup) $html = $this->cleanupHTML($html); |
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| 336 | |
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| 337 | // return |
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| 338 | return $html; |
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| 339 | } |
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| 340 | |
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| 341 | |
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| 342 | /** |
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| 343 | * Process the loaded CSS |
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| 344 | * |
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| 345 | * @return void |
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| 346 | */ |
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| 347 | private function processCSS() |
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| 348 | { |
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| 349 | // init vars |
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| 350 | $css = (string) $this->css; |
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| 351 | |
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| 352 | // remove newlines |
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| 353 | $css = str_replace(array("\r", "\n"), '', $css); |
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| 354 | |
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| 355 | // replace double quotes by single quotes |
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| 356 | $css = str_replace('"', '\'', $css); |
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| 357 | |
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| 358 | // remove comments |
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| 359 | $css = preg_replace('|/\*.*?\*/|', '', $css); |
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| 360 | |
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| 361 | // remove spaces |
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| 362 | $css = preg_replace('/\s\s+/', ' ', $css); |
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| 363 | |
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| 364 | // rules are splitted by } |
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| 365 | $rules = (array) explode('}', $css); |
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| 366 | |
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| 367 | // init var |
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| 368 | $i = 1; |
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| 369 | |
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| 370 | // loop rules |
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| 371 | foreach($rules as $rule) |
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| 372 | { |
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| 373 | // split into chunks |
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| 374 | $chunks = explode('{', $rule); |
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| 375 | |
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| 376 | // invalid rule? |
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| 377 | if(!isset($chunks[1])) continue; |
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| 378 | |
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| 379 | // set the selectors |
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| 380 | $selectors = trim($chunks[0]); |
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| 381 | |
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| 382 | // get cssProperties |
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| 383 | $cssProperties = trim($chunks[1]); |
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| 384 | |
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| 385 | // split multiple selectors |
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| 386 | $selectors = (array) explode(',', $selectors); |
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| 387 | |
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| 388 | // loop selectors |
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| 389 | foreach($selectors as $selector) |
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| 390 | { |
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| 391 | // cleanup |
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| 392 | $selector = trim($selector); |
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| 393 | |
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| 394 | // build an array for each selector |
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| 395 | $ruleSet = array(); |
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| 396 | |
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| 397 | // store selector |
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| 398 | $ruleSet['selector'] = $selector; |
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| 399 | |
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| 400 | // process the properties |
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| 401 | $ruleSet['properties'] = $this->processCSSProperties($cssProperties); |
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| 402 | |
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| 403 | // calculate specifity |
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| 404 | $ruleSet['specifity'] = $this->calculateCSSSpecifity($selector); |
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| 405 | |
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| 406 | // add into global rules |
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| 407 | $this->cssRules[] = $ruleSet; |
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| 408 | } |
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| 409 | |
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| 410 | // increment |
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| 411 | $i++; |
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| 412 | } |
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| 413 | |
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| 414 | // sort based on specifity |
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| 415 | if(!empty($this->cssRules)) usort($this->cssRules, array('CSSToInlineStyles', 'sortOnSpecifity')); |
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| 416 | } |
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| 417 | |
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| 418 | |
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| 419 | /** |
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| 420 | * Process the CSS-properties |
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| 421 | * |
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| 422 | * @return array |
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| 423 | * @param string $propertyString |
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| 424 | */ |
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| 425 | private function processCSSProperties($propertyString) |
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| 426 | { |
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| 427 | // split into chunks |
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| 428 | $properties = (array) explode(';', $propertyString); |
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| 429 | |
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| 430 | // init var |
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| 431 | $pairs = array(); |
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| 432 | |
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| 433 | // loop properties |
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| 434 | foreach($properties as $property) |
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| 435 | { |
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| 436 | // split into chunks |
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| 437 | $chunks = (array) explode(':', $property, 2); |
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| 438 | |
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| 439 | // validate |
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| 440 | if(!isset($chunks[1])) continue; |
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| 441 | |
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| 442 | // add to pairs array |
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| 443 | $pairs[trim($chunks[0])] = trim($chunks[1]); |
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| 444 | } |
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| 445 | |
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| 446 | // sort the pairs |
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| 447 | ksort($pairs); |
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| 448 | |
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| 449 | // return |
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| 450 | return $pairs; |
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| 451 | } |
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| 452 | |
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| 453 | |
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| 454 | /** |
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| 455 | * Should the IDs and classes be removed? |
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| 456 | * |
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| 457 | * @return void |
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| 458 | * @param bool[optional] $on |
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| 459 | */ |
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| 460 | public function setCleanup($on = true) |
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| 461 | { |
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| 462 | $this->cleanup = (bool) $on; |
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| 463 | } |
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| 464 | |
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| 465 | |
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| 466 | /** |
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| 467 | * Set CSS to use |
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| 468 | * |
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| 469 | * @return void |
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| 470 | * @param string $css The CSS to use |
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| 471 | */ |
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| 472 | public function setCSS($css) |
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| 473 | { |
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| 474 | $this->css = (string) $css; |
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| 475 | } |
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| 476 | |
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| 477 | |
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| 478 | /** |
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| 479 | * Set HTML to process |
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| 480 | * |
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| 481 | * @return void |
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| 482 | * @param string $html |
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| 483 | */ |
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| 484 | public function setHTML($html) |
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| 485 | { |
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| 486 | $this->html = (string) $html; |
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| 487 | } |
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| 488 | |
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| 489 | |
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| 490 | /** |
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| 491 | * Set use of inline styles block |
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| 492 | * If this is enabled the class will use the style-block in the HTML. |
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| 493 | * |
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| 494 | * @param bool[optional] $on |
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| 495 | */ |
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| 496 | public function setUseInlineStylesBlock($on = true) |
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| 497 | { |
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| 498 | $this->useInlineStylesBlock = (bool) $on; |
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| 499 | } |
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| 500 | |
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| 501 | |
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| 502 | /** |
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| 503 | * Sort an array on the specifity element |
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| 504 | * |
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| 505 | * @return int |
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| 506 | * @param array $e1 The first element |
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| 507 | * @param array $e2 The second element |
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| 508 | */ |
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| 509 | private static function sortOnSpecifity($e1, $e2) |
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| 510 | { |
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| 511 | // validate |
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| 512 | if(!isset($e1['specifity']) || !isset($e2['specifity'])) return 0; |
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| 513 | |
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| 514 | // lower |
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| 515 | if($e1['specifity'] < $e2['specifity']) return -1; |
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| 516 | |
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| 517 | // higher |
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| 518 | if($e1['specifity'] > $e2['specifity']) return 1; |
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| 519 | |
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| 520 | // fallback |
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| 521 | return 0; |
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| 522 | } |
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| 523 | } |
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| 524 | |
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| 525 | |
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| 526 | /** |
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| 527 | * CSSToInlineStyles Exception class |
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| 528 | * |
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| 529 | * @author Tijs Verkoyen <php-css-to-inline-styles@verkoyen.eu> |
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| 530 | */ |
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| 531 | class CSSToInlineStylesException extends Exception |
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| 532 | { |
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| 533 | } |
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| 534 | |
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| 535 | ?> |
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