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Developer Documentation
- Bug fixes for general core bugs in 4.2.x will end 22 April 2024 (12 months).
- Bug fixes for security issues in 4.2.x will end 7 October 2024 (18 months).
- PHP version: minimum PHP 8.0.0 Note: minimum PHP version has increased since Moodle 4.1. PHP 8.1.x is supported too.
Differences Between: [Versions 311 and 402] [Versions 400 and 402] [Versions 401 and 402]
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| File Size: | 547 lines (21 kb) |
| Included or required: | 0 times |
| Referenced: | 0 times |
| Includes or requires: | 0 files |
Defines 1 class
brickfield_accessibility_css:: (13 methods):
__construct()
load_css()
load_imported_files()
get_specificity()
get_style()
add_selector()
get_node_style()
walkup_tree_for_inheritance()
load_uri()
format_css()
get_xpath()
is_char()
parse_selector()
Class: brickfield_accessibility_css - X-Ref
Parse content to check CSS validity.This class first parses all the CSS in the document and prepares an index of CSS styles to be used by accessibility tests
to determine color and positioning.
First, in loadCSS we get all the inline and linked style sheet information and merge it into a large CSS file string.
Second, in setStyles we use XPath queries to find all the DOM elements which are effected by CSS styles and then
build up an index in style_index of all the CSS styles keyed by an attriute we attach to all DOM objects to lookup
the style quickly.
Most of the second step is to get around the problem where XPath DOMNodeList objects are only marginally referential
to the original elements and cannot be altered directly.
| __construct(\DOMDocument &$dom, string $uri, string $type, array $path, bool $cmsmode = false,array $cssfiles = []) X-Ref |
| Class constructor. We are just building and importing variables here and then loading the CSS param: \DOMDocument $dom The DOMDocument object param: string $uri The URI of the request param: string $type The type of request param: array $path param: bool $cmsmode Whether we are running in CMS mode param: array $cssfiles An array of additional CSS files to load |
| load_css() X-Ref |
| Loads all the CSS files from the document using LINK elements or @import commands |
| load_imported_files() X-Ref |
| Imports files from the CSS file using @import commands |
| get_specificity(string $selector) X-Ref |
| Returns a specificity count to the given selector. Higher specificity means it overrides other styles. param: string $selector The CSS Selector return: int $specifity |
| get_style($element) X-Ref |
| Interface method for tests to call to lookup the style information for a given DOMNode param: \stdClass $element A DOMElement/DOMNode object return: array An array of style information (can be empty) |
| add_selector(string $key, string $codestr) X-Ref |
| Adds a selector to the CSS index param: string $key The CSS selector param: string $codestr The CSS Style code string return: null |
| get_node_style($element) X-Ref |
| Returns the style from the CSS index for a given element by first looking into its tag bucket then iterating over every item for an element that matches param: \stdClass $element return: array An array of all the style elements that _directly_ apply to that element (ignoring inheritance) |
| walkup_tree_for_inheritance($element, array $style) X-Ref |
| A helper function to walk up the DOM tree to the end to build an array of styles. param: \stdClass $element The DOMNode object to walk up from param: array $style The current style built for the node return: array The array of the DOM element, altered if it was overruled through css inheritance |
| load_uri(string $rel) X-Ref |
| Loads a CSS file from a URI param: string $rel The URI of the CSS file |
| format_css() X-Ref |
| Formats the CSS to be ready to import into an array of styles return: bool Whether there were elements imported or not |
| get_xpath(string $selector) X-Ref |
| Converts a CSS selector to an Xpath query param: string $selector The selector to convert return: string An Xpath query string |
| is_char(string $char) X-Ref |
| Checks that a string is really a regular character param: string $char The character return: bool Whether the string is a character |
| parse_selector(string $query) X-Ref |
| Parses a CSS selector into an array of rules. param: string $query The CSS Selector query return: array An array of the CSS Selector parsed into rule segments |
