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<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
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namespace tool_brickfield\local\htmlchecker\common;
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/**
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* Parse content to check CSS validity.
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*
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* This class first parses all the CSS in the document and prepares an index of CSS styles to be used by accessibility tests
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* to determine color and positioning.
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*
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* First, in loadCSS we get all the inline and linked style sheet information and merge it into a large CSS file string.
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*
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* Second, in setStyles we use XPath queries to find all the DOM elements which are effected by CSS styles and then
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* build up an index in style_index of all the CSS styles keyed by an attriute we attach to all DOM objects to lookup
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* the style quickly.
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*
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* Most of the second step is to get around the problem where XPath DOMNodeList objects are only marginally referential
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* to the original elements and cannot be altered directly.
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*
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* @package tool_brickfield
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* @copyright 2020 onward: Brickfield Education Labs, www.brickfield.ie
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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class brickfield_accessibility_css {
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/** @var object The DOMDocument object of the current document */
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public $dom;
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/** @var string The URI of the current document */
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public $uri;
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/** @var string The type of request (inherited from the main htmlchecker object) */
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public $type;
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/** @var array An array of all the CSS elements and attributes */
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public $css;
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/** @var string Additional CSS information (usually for CMS mode requests) */
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public $cssstring;
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/** @var bool Whether or not we are running in CMS mode */
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public $cmsmode;
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/** @var array An array of all the strings which means the current style inherts from above */
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public $inheritancestrings = ['inherit', 'currentColor'];
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/** @var array An array of all the styles keyed by the new attribute brickfield_accessibility_style_index */
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public $styleindex = [];
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/** @var int The next index ID to be applied to a node to lookup later in style_index */
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public $nextindex = 0;
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/** @var array A list of all the elements which support deprecated styles such as 'background' or 'bgcolor' */
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public $deprecatedstyleelements = ['body', 'table', 'tr', 'td', 'th'];
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/** @var array */
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public array $path = [];
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/** @var array To store additional CSS files to load. */
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public array $css_files = [];
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/**
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* Class constructor. We are just building and importing variables here and then loading the CSS
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* @param \DOMDocument $dom The DOMDocument object
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* @param string $uri The URI of the request
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* @param string $type The type of request
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* @param array $path
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* @param bool $cmsmode Whether we are running in CMS mode
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* @param array $cssfiles An array of additional CSS files to load
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*/
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public function __construct(\DOMDocument &$dom, string $uri, string $type, array $path, bool $cmsmode = false,
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array $cssfiles = []) {
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$this->dom =& $dom;
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$this->type = $type;
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$this->uri = $uri;
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$this->path = $path;
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$this->cmsmode = $cmsmode;
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$this->css_files = $cssfiles;
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}
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/**
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* Loads all the CSS files from the document using LINK elements or @import commands
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*/
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private function load_css() {
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if (count($this->css_files) > 0) {
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$css = $this->css_files;
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} else {
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$css = [];
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$headerstyles = $this->dom->getElementsByTagName('style');
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foreach ($headerstyles as $headerstyle) {
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if ($headerstyle->nodeValue) {
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$this->cssstring .= $headerstyle->nodeValue;
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}
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}
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$stylesheets = $this->dom->getElementsByTagName('link');
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foreach ($stylesheets as $style) {
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if ($style->hasAttribute('rel') &&
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(strtolower($style->getAttribute('rel')) == 'stylesheet') &&
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($style->getAttribute('media') != 'print')) {
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$css[] = $style->getAttribute('href');
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}
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}
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}
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foreach ($css as $sheet) {
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$this->load_uri($sheet);
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}
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$this->load_imported_files();
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$this->cssstring = str_replace(':link', '', $this->cssstring);
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$this->format_css();
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}
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/**
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* Imports files from the CSS file using @import commands
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*/
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private function load_imported_files() {
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$matches = [];
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preg_match_all('/@import (.*?);/i', $this->cssstring, $matches);
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if (count($matches[1]) == 0) {
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return null;
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}
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foreach ($matches[1] as $match) {
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$this->load_uri(trim(str_replace('url', '', $match), '"\')('));
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}
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preg_replace('/@import (.*?);/i', '', $this->cssstring);
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}
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/**
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* Returns a specificity count to the given selector.
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* Higher specificity means it overrides other styles.
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* @param string $selector The CSS Selector
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* @return int $specifity
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*/
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public function get_specificity(string $selector): int {
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$selector = $this->parse_selector($selector);
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if ($selector[0][0] == ' ') {
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unset($selector[0][0]);
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}
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$selector = $selector[0];
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$specificity = 0;
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foreach ($selector as $part) {
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switch(substr(str_replace('*', '', $part), 0, 1)) {
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case '.':
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$specificity += 10;
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case '#':
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$specificity += 100;
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case ':':
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$specificity++;
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default:
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$specificity++;
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}
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if (strpos($part, '[id=') != false) {
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$specificity += 100;
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}
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}
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return $specificity;
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}
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/**
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* Interface method for tests to call to lookup the style information for a given DOMNode
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* @param \stdClass $element A DOMElement/DOMNode object
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* @return array An array of style information (can be empty)
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*/
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public function get_style($element): array {
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// To prevent having to parse CSS unless the info is needed,
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// we check here if CSS has been set, and if not, run off the parsing now.
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if (!is_a($element, 'DOMElement')) {
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return [];
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}
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$style = $this->get_node_style($element);
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if (isset($style['background-color']) || isset($style['color'])) {
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$style = $this->walkup_tree_for_inheritance($element, $style);
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}
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if ($element->hasAttribute('style')) {
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$inlinestyles = explode(';', $element->getAttribute('style'));
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foreach ($inlinestyles as $inlinestyle) {
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$s = explode(':', $inlinestyle);
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if (isset($s[1])) { // Edit: Make sure the style attribute doesn't have a trailing.
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$style[trim($s[0])] = trim(strtolower($s[1]));
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}
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}
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}
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if ($element->tagName === 'strong') {
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$style['font-weight'] = 'bold';
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}
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if ($element->tagName === 'em') {
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$style['font-style'] = 'italic';
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}
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if (!is_array($style)) {
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return [];
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}
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return $style;
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}
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/**
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* Adds a selector to the CSS index
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* @param string $key The CSS selector
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* @param string $codestr The CSS Style code string
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* @return null
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*/
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private function add_selector(string $key, string $codestr) {
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if (strpos($key, '@import') !== false) {
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return null;
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}
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$key = strtolower($key);
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$codestr = strtolower($codestr);
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if (!isset($this->css[$key])) {
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$this->css[$key] = array();
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}
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$codes = explode(';', $codestr);
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if (count($codes) > 0) {
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foreach ($codes as $code) {
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$code = trim($code);
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$explode = explode(':', $code, 2);
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if (count($explode) > 1) {
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list($codekey, $codevalue) = $explode;
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if (strlen($codekey) > 0) {
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$this->css[$key][trim($codekey)] = trim($codevalue);
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}
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}
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}
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}
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}
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/**
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* Returns the style from the CSS index for a given element by first
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* looking into its tag bucket then iterating over every item for an
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* element that matches
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* @param \stdClass $element
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* @return array An array of all the style elements that _directly_ apply to that element (ignoring inheritance)
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*/
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private function get_node_style($element): array {
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$style = [];
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if ($element->hasAttribute('brickfield_accessibility_style_index')) {
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$style = $this->styleindex[$element->getAttribute('brickfield_accessibility_style_index')];
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}
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// To support the deprecated 'bgcolor' attribute.
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if ($element->hasAttribute('bgcolor') && in_array($element->tagName, $this->deprecatedstyleelements)) {
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$style['background-color'] = $element->getAttribute('bgcolor');
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}
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if ($element->hasAttribute('style')) {
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$inlinestyles = explode(';', $element->getAttribute('style'));
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foreach ($inlinestyles as $inlinestyle) {
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$s = explode(':', $inlinestyle);
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if (isset($s[1])) { // Edit: Make sure the style attribute doesn't have a trailing.
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$style[trim($s[0])] = trim(strtolower($s[1]));
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}
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}
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}
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return $style;
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}
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/**
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* A helper function to walk up the DOM tree to the end to build an array of styles.
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* @param \stdClass $element The DOMNode object to walk up from
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* @param array $style The current style built for the node
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* @return array The array of the DOM element, altered if it was overruled through css inheritance
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*/
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private function walkup_tree_for_inheritance($element, array $style): array {
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while (property_exists($element->parentNode, 'tagName')) {
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$parentstyle = $this->get_node_style($element->parentNode);
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if (is_array($parentstyle)) {
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foreach ($parentstyle as $k => $v) {
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if (!isset($style[$k])) {
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$style[$k] = $v;
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}
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if ((!isset($style['background-color'])) || strtolower($style['background-color']) == strtolower("#FFFFFF")) {
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if ($k == 'background-color') {
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$style['background-color'] = $v;
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}
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}
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if ((!isset($style['color'])) || strtolower($style['color']) == strtolower("#000000")) {
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if ($k == 'color') {
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$style['color'] = $v;
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}
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}
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}
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}
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$element = $element->parentNode;
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}
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return $style;
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}
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/**
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* Loads a CSS file from a URI
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* @param string $rel The URI of the CSS file
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*/
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private function load_uri(string $rel) {
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if ($this->type == 'file') {
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$uri = substr($this->uri, 0, strrpos($this->uri, '/')) .'/'.$rel;
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} else {
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$bfao = new \tool_brickfield\local\htmlchecker\brickfield_accessibility();
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$uri = $bfao->get_absolute_path($this->uri, $rel);
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}
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$this->cssstring .= @file_get_contents($uri);
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}
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/**
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* Formats the CSS to be ready to import into an array of styles
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* @return bool Whether there were elements imported or not
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*/
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private function format_css(): bool {
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// Remove comments.
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$str = preg_replace("/\/\*(.*)?\*\//Usi", "", $this->cssstring);
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// Parse this csscode.
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$parts = explode("}", $str);
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if (count($parts) > 0) {
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foreach ($parts as $part) {
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if (strpos($part, '{') !== false) {
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list($keystr, $codestr) = explode("{", $part);
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$keys = explode(", ", trim($keystr));
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if (count($keys) > 0) {
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foreach ($keys as $key) {
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if (strlen($key) > 0) {
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$key = str_replace("\n", "", $key);
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$key = str_replace("\\", "", $key);
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$this->add_selector($key, trim($codestr));
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}
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}
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}
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}
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}
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}
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return (count($this->css) > 0);
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}
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/**
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* Converts a CSS selector to an Xpath query
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* @param string $selector The selector to convert
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* @return string An Xpath query string
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*/
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352 |
private function get_xpath(string $selector): string {
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353 |
$query = $this->parse_selector($selector);
|
|
|
354 |
|
|
|
355 |
$xpath = '//';
|
|
|
356 |
foreach ($query[0] as $k => $q) {
|
|
|
357 |
if ($q == ' ' && $k) {
|
|
|
358 |
$xpath .= '//';
|
|
|
359 |
} else if ($q == '>' && $k) {
|
|
|
360 |
$xpath .= '/';
|
|
|
361 |
} else if (substr($q, 0, 1) == '#') {
|
|
|
362 |
$xpath .= '[ @id = "' . str_replace('#', '', $q) . '" ]';
|
|
|
363 |
} else if (substr($q, 0, 1) == '.') {
|
|
|
364 |
$xpath .= '[ @class = "' . str_replace('.', '', $q) . '" ]';
|
|
|
365 |
} else if (substr($q, 0, 1) == '[') {
|
|
|
366 |
$xpath .= str_replace('[id', '[ @ id', $q);
|
|
|
367 |
} else {
|
|
|
368 |
$xpath .= trim($q);
|
|
|
369 |
}
|
|
|
370 |
}
|
|
|
371 |
return str_replace('//[', '//*[', str_replace('//[ @', '//*[ @', $xpath));
|
|
|
372 |
}
|
|
|
373 |
|
|
|
374 |
/**
|
|
|
375 |
* Checks that a string is really a regular character
|
|
|
376 |
* @param string $char The character
|
|
|
377 |
* @return bool Whether the string is a character
|
|
|
378 |
*/
|
|
|
379 |
private function is_char(string $char): bool {
|
|
|
380 |
return extension_loaded('mbstring') ? mb_eregi('\w', $char) : preg_match('@\w@', $char);
|
|
|
381 |
}
|
|
|
382 |
|
|
|
383 |
/**
|
|
|
384 |
* Parses a CSS selector into an array of rules.
|
|
|
385 |
* @param string $query The CSS Selector query
|
|
|
386 |
* @return array An array of the CSS Selector parsed into rule segments
|
|
|
387 |
*/
|
|
|
388 |
private function parse_selector(string $query): array {
|
|
|
389 |
// Clean spaces.
|
|
|
390 |
$query = trim(preg_replace('@\s+@', ' ', preg_replace('@\s*(>|\\+|~)\s*@', '\\1', $query)));
|
|
|
391 |
$queries = [[]];
|
|
|
392 |
if (!$query) {
|
|
|
393 |
return $queries;
|
|
|
394 |
}
|
|
|
395 |
$return =& $queries[0];
|
|
|
396 |
$specialchars = ['>', ' '];
|
|
|
397 |
$specialcharsmapping = [];
|
|
|
398 |
$strlen = mb_strlen($query);
|
|
|
399 |
$classchars = ['.', '-'];
|
|
|
400 |
$pseudochars = ['-'];
|
|
|
401 |
$tagchars = ['*', '|', '-'];
|
|
|
402 |
// Split multibyte string
|
|
|
403 |
// http://code.google.com/p/phpquery/issues/detail?id=76.
|
|
|
404 |
$newquery = [];
|
|
|
405 |
for ($i = 0; $i < $strlen; $i++) {
|
|
|
406 |
$newquery[] = mb_substr($query, $i, 1);
|
|
|
407 |
}
|
|
|
408 |
$query = $newquery;
|
|
|
409 |
// It works, but i dont like it...
|
|
|
410 |
$i = 0;
|
|
|
411 |
while ($i < $strlen) {
|
|
|
412 |
$c = $query[$i];
|
|
|
413 |
$tmp = '';
|
|
|
414 |
// TAG.
|
|
|
415 |
if ($this->is_char($c) || in_array($c, $tagchars)) {
|
|
|
416 |
while (isset($query[$i]) && ($this->is_char($query[$i]) || in_array($query[$i], $tagchars))) {
|
|
|
417 |
$tmp .= $query[$i];
|
|
|
418 |
$i++;
|
|
|
419 |
}
|
|
|
420 |
$return[] = $tmp;
|
|
|
421 |
// IDs.
|
|
|
422 |
} else if ( $c == '#') {
|
|
|
423 |
$i++;
|
|
|
424 |
while (isset($query[$i]) && ($this->is_char($query[$i]) || $query[$i] == '-')) {
|
|
|
425 |
$tmp .= $query[$i];
|
|
|
426 |
$i++;
|
|
|
427 |
}
|
|
|
428 |
$return[] = '#'.$tmp;
|
|
|
429 |
// SPECIAL CHARS.
|
|
|
430 |
} else if (in_array($c, $specialchars)) {
|
|
|
431 |
$return[] = $c;
|
|
|
432 |
$i++;
|
|
|
433 |
// MAPPED SPECIAL CHARS.
|
|
|
434 |
} else if ( isset($specialcharsmapping[$c])) {
|
|
|
435 |
$return[] = $specialcharsmapping[$c];
|
|
|
436 |
$i++;
|
|
|
437 |
// COMMA.
|
|
|
438 |
} else if ( $c == ',') {
|
|
|
439 |
$queries[] = [];
|
|
|
440 |
$return =& $queries[count($queries) - 1];
|
|
|
441 |
$i++;
|
|
|
442 |
while (isset($query[$i]) && $query[$i] == ' ') {
|
|
|
443 |
$i++;
|
|
|
444 |
}
|
|
|
445 |
// CLASSES.
|
|
|
446 |
} else if ($c == '.') {
|
|
|
447 |
while (isset($query[$i]) && ($this->is_char($query[$i]) || in_array($query[$i], $classchars))) {
|
|
|
448 |
$tmp .= $query[$i];
|
|
|
449 |
$i++;
|
|
|
450 |
}
|
|
|
451 |
$return[] = $tmp;
|
|
|
452 |
// General Sibling Selector.
|
|
|
453 |
} else if ($c == '~') {
|
|
|
454 |
$spaceallowed = true;
|
|
|
455 |
$tmp .= $query[$i++];
|
|
|
456 |
while (isset($query[$i])
|
|
|
457 |
&& ($this->is_char($query[$i])
|
|
|
458 |
|| in_array($query[$i], $classchars)
|
|
|
459 |
|| $query[$i] == '*'
|
|
|
460 |
|| ($query[$i] == ' ' && $spaceallowed)
|
|
|
461 |
)) {
|
|
|
462 |
if ($query[$i] != ' ') {
|
|
|
463 |
$spaceallowed = false;
|
|
|
464 |
}
|
|
|
465 |
$tmp .= $query[$i];
|
|
|
466 |
$i++;
|
|
|
467 |
}
|
|
|
468 |
$return[] = $tmp;
|
|
|
469 |
// Adjacent sibling selectors.
|
|
|
470 |
} else if ($c == '+') {
|
|
|
471 |
$spaceallowed = true;
|
|
|
472 |
$tmp .= $query[$i++];
|
|
|
473 |
while (isset($query[$i])
|
|
|
474 |
&& ($this->is_char($query[$i])
|
|
|
475 |
|| in_array($query[$i], $classchars)
|
|
|
476 |
|| $query[$i] == '*'
|
|
|
477 |
|| ($spaceallowed && $query[$i] == ' ')
|
|
|
478 |
)) {
|
|
|
479 |
if ($query[$i] != ' ') {
|
|
|
480 |
$spaceallowed = false;
|
|
|
481 |
}
|
|
|
482 |
$tmp .= $query[$i];
|
|
|
483 |
$i++;
|
|
|
484 |
}
|
|
|
485 |
$return[] = $tmp;
|
|
|
486 |
// ATTRS.
|
|
|
487 |
} else if ($c == '[') {
|
|
|
488 |
$stack = 1;
|
|
|
489 |
$tmp .= $c;
|
|
|
490 |
while (isset($query[++$i])) {
|
|
|
491 |
$tmp .= $query[$i];
|
|
|
492 |
if ( $query[$i] == '[') {
|
|
|
493 |
$stack++;
|
|
|
494 |
} else if ( $query[$i] == ']') {
|
|
|
495 |
$stack--;
|
|
|
496 |
if (!$stack) {
|
|
|
497 |
break;
|
|
|
498 |
}
|
|
|
499 |
}
|
|
|
500 |
}
|
|
|
501 |
$return[] = $tmp;
|
|
|
502 |
$i++;
|
|
|
503 |
// PSEUDO CLASSES.
|
|
|
504 |
} else if ($c == ':') {
|
|
|
505 |
$stack = 1;
|
|
|
506 |
$tmp .= $query[$i++];
|
|
|
507 |
while (isset($query[$i]) && ($this->is_char($query[$i]) || in_array($query[$i], $pseudochars))) {
|
|
|
508 |
$tmp .= $query[$i];
|
|
|
509 |
$i++;
|
|
|
510 |
}
|
|
|
511 |
// With arguments?
|
|
|
512 |
if (isset($query[$i]) && $query[$i] == '(') {
|
|
|
513 |
$tmp .= $query[$i];
|
|
|
514 |
$stack = 1;
|
|
|
515 |
while (isset($query[++$i])) {
|
|
|
516 |
$tmp .= $query[$i];
|
|
|
517 |
if ( $query[$i] == '(') {
|
|
|
518 |
$stack++;
|
|
|
519 |
} else if ( $query[$i] == ')') {
|
|
|
520 |
$stack--;
|
|
|
521 |
if (!$stack) {
|
|
|
522 |
break;
|
|
|
523 |
}
|
|
|
524 |
}
|
|
|
525 |
}
|
|
|
526 |
$return[] = $tmp;
|
|
|
527 |
$i++;
|
|
|
528 |
} else {
|
|
|
529 |
$return[] = $tmp;
|
|
|
530 |
}
|
|
|
531 |
} else {
|
|
|
532 |
$i++;
|
|
|
533 |
}
|
|
|
534 |
}
|
|
|
535 |
foreach ($queries as $k => $q) {
|
|
|
536 |
if (isset($q[0])) {
|
|
|
537 |
if (isset($q[0][0]) && $q[0][0] == ':') {
|
|
|
538 |
array_unshift($queries[$k], '*');
|
|
|
539 |
}
|
|
|
540 |
if ($q[0] != '>') {
|
|
|
541 |
array_unshift($queries[$k], ' ');
|
|
|
542 |
}
|
|
|
543 |
}
|
|
|
544 |
}
|
|
|
545 |
return $queries;
|
|
|
546 |
}
|
|
|
547 |
}
|