See Release Notes
Long Term Support Release
Differences Between: [Versions 311 and 401] [Versions 400 and 401]
1 <?php 2 // This file is part of Moodle - http://moodle.org/ 3 // 4 // Moodle is free software: you can redistribute it and/or modify 5 // it under the terms of the GNU General Public License as published by 6 // the Free Software Foundation, either version 3 of the License, or 7 // (at your option) any later version. 8 // 9 // Moodle is distributed in the hope that it will be useful, 10 // but WITHOUT ANY WARRANTY; without even the implied warranty of 11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 // GNU General Public License for more details. 13 // 14 // You should have received a copy of the GNU General Public License 15 // along with Moodle. If not, see <http://www.gnu.org/licenses/>. 16 17 namespace tool_brickfield\local\htmlchecker\common\checks; 18 19 use DOMXPath; 20 use tool_brickfield\local\htmlchecker\common\brickfield_accessibility_color_test; 21 22 /** 23 * Brickfield accessibility HTML checker library. 24 * 25 * @package tool_brickfield 26 * @copyright 2020 onward: Brickfield Education Labs, www.brickfield.ie 27 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later 28 */ 29 class css_text_has_contrast extends brickfield_accessibility_color_test { 30 31 /** @var int The default severity code for this test. */ 32 public $defaultseverity = \tool_brickfield\local\htmlchecker\brickfield_accessibility::BA_TEST_SEVERE; 33 34 /** @var string The default background color. */ 35 public $defaultbackground = '#ffffff'; 36 37 /** @var string The default color. */ 38 public $defaultcolor = '#000000'; 39 40 /** 41 * The main check function. This is called by the parent class to actually check content 42 */ 43 public function check(): void { 44 if (isset($this->options['css_background'])) { 45 $this->defaultbackground = $this->options['css_background']; 46 } 47 48 if (isset($this->options['css_foreground'])) { 49 $this->defaultcolor = $this->options['css_foreground']; 50 } 51 52 $xpath = new DOMXPath($this->dom); 53 54 // Selects all nodes that have a style attribute OR 'strong' OR 'em' elements that: 55 // Contain only the text in their text nodes 56 // OR Have text nodes AND text nodes that are not equal to the string-value of the context node 57 // OR Have a text node descendant that equals the string-value of the context node and has no style attributes. 58 59 $entries = $xpath->query('//*[(text() = . or ( ./*[text() != .]) or (.//*[text() = . and not(@style)])) 60 and ((@style) or (name() = "strong") or (name() = "em"))]'); 61 62 foreach ($entries as $element) { 63 $style = $this->css->get_style($element); 64 65 if (isset($style['background-color']) || isset($style['color'])) { 66 if (!isset($style['background-color'])) { 67 $style['background-color'] = $this->defaultbackground; 68 } 69 70 if (!isset($style['color'])) { 71 $style['color'] = $this->defaultcolor; 72 } 73 74 if ((isset($style['background']) || isset($style['background-color'])) && isset($style['color']) && 75 $element->nodeValue) { 76 77 $background = (isset($style['background-color'])) ? $style['background-color'] : $style['background']; 78 if (!$background || !empty($this->options['css_only_use_default'])) { 79 $background = $this->defaultbackground; 80 } 81 82 $style['color'] = '#' . $this->convert_color($style['color']); 83 $style['background-color'] = '#' . $this->convert_color($background); 84 85 if (substr($background, 0, 3) == "rgb") { 86 $background = '#' . $this->convert_color($background); 87 } 88 89 $luminosity = $this->get_luminosity($style['color'], $background); 90 $fontsize = 0; 91 $bold = false; 92 $italic = false; 93 94 if (isset($style['font-size'])) { 95 $fontsize = $this->get_fontsize($style['font-size']); 96 } 97 98 if (isset($style['font-weight'])) { 99 preg_match_all('!\d+!', $style['font-weight'], $matches); 100 101 if (count($matches) > 0) { 102 if ($matches >= 700) { 103 $bold = true; 104 } else { 105 if ($style['font-weight'] === 'bold' || $style['font-weight'] === 'bolder') { 106 $bold = true; 107 } 108 } 109 } 110 } else if ($element->tagName === "strong") { 111 $bold = true; 112 $style['font-weight'] = "bold"; 113 } else { 114 $style['font-weight'] = "normal"; 115 } 116 117 if (isset($style['font-style'])) { 118 if ($style['font-style'] === "italic") { 119 $italic = true; 120 } 121 } else if ($element->tagName === "em") { 122 $italic = true; 123 $style['font-style'] = "italic"; 124 } else { 125 $style['font-style'] = "normal"; 126 } 127 128 if ($element->tagName === 'h1' || $element->tagName === 'h2' || $element->tagName === 'h3' || 129 $element->tagName === 'h4' || $element->tagName === 'h5' || $element->tagName === 'h6' || 130 $fontsize >= 18 || $fontsize >= 14 && $bold) { 131 if ($luminosity < 3) { 132 $message = 'heading: background-color: ' . $background . '; color:' . $style["color"] . 133 '; font-style: ' . $style['font-style'] . '; font-weight: ' . $style['font-weight'] . '; '; 134 $this->add_report($element, $message); 135 } 136 } else { 137 if ($luminosity < 4.5) { 138 $message = 'text: background-color: ' . $background . '; color:' . $style["color"] . '; font-style: ' . 139 $style['font-style'] . '; font-weight: ' . $style['font-weight'] . '; '; 140 $this->add_report($element, $message); 141 } 142 } 143 } 144 } 145 } 146 } 147 }
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