43 lines
1.3 KiB
Plaintext
43 lines
1.3 KiB
Plaintext
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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