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We can now pass arrays of rule classes to the parser constructor, overriding the rules that would normally be used by the parser. This allows us to create custom variants of the wikitext parser with their own content type. It could also provide a basis for a new Markdown parser based on our existing wikitext parser but with new rules.
42 lines
1.3 KiB
Text
42 lines
1.3 KiB
Text
created: 20210203150855206
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modified: 20210203150855206
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title: ParserSubclassingMechanism
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!! Introduction
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The wikitext parser subclassing mechanism makes it possible for custom parsers to use the wiki text parsing engine, but to customise the rules that are used.
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!! Example
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Here is an example of a subclass of the checkbox widget that adds logging to the event handler:
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```js
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(function(){
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/*jslint node: true, browser: true */
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/*global $tw: false */
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"use strict";
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var WikiParser = require("$:/core/modules/parsers/wikiparser/wikiparser.js")["text/vnd.tiddlywiki"],
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HtmlParser = $tw.modules.createClassFromModule(require("$:/core/modules/parsers/wikiparser/rules/html.js"),$tw.WikiRuleBase),
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EntityParser = $tw.modules.createClassFromModule(require("$:/core/modules/parsers/wikiparser/rules/entity.js"),$tw.WikiRuleBase);
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var MyCustomWikiParser = function(type,text,options) {
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var parser = new WikiParser(type,text,$tw.utils.extend({},options,{
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// Force the parser to parse in inline mode
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parseAsInline: true,
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// Specify which rules will be used
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rules: {
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pragma: [],
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block: [],
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inline: [HtmlParser,EntityParser]
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}
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}));
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this.tree = parser.tree;
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this.prototype = parser.prototype;
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};
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exports["text/vnd.my-custom-type"] = MyCustomWikiParser;
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})();
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```
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