mirror of
https://github.com/Jermolene/TiddlyWiki5
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52 lines
2.3 KiB
Plaintext
52 lines
2.3 KiB
Plaintext
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title: ParsingMechanism
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tags: docs mechanism
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TiddlyWiki parses the content of tiddlers to build an internal tree representation that is used for several purposes:
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* Rendering a tiddler to other formats (e.g. converting wikitext to HTML)
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* Detecting outgoing links from a tiddler, and from them...
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* ...computing incoming links to a tiddler
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* Detecting tiddlers that are orphans with no incoming links
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* Detecting tiddlers that are referred to but missing
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The parse tree is built when needed, and then cached by the WikiStore until the tiddler changes.
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TiddlyWiki5 uses multiple parsers:
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* Wikitext ({{{text/x-tiddlywiki}}}) in `js/WikiTextParser.js`
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* JavaScript ({{{text/javascript}}}) in `js/JavaScriptParser.js`
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* Images ({{{image/png}}} and {{{image/jpg}}}) in `js/ImageParser.js`
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* JSON ({{{application/json}}}) in `js/JSONParser.js`
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Additional parsers are planned:
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* CSS ({{{text/css}}})
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* Recipe ({{{text/x-tiddlywiki-recipe}}})
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One global instance of each parser is instantiated in `js/App.js` and registered with the main WikiStore object.
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The parsers are all used the same way:
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$$$.js
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var parseTree = parser.parse(type,text) // Parses the text and returns a parse tree object
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$$$
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The parse tree object exposes the following fields:
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$$$.js
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var renderer = parseTree.compile(type); // Compiles the parse tree into a renderer for the specified MIME type
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console.log(parseTree.toString(type)); // Returns a readable string representation of the parse tree (either `text/html` or `text/plain`)
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var dependencies = parseTree.dependencies; // Gets the dependencies of the parse tree (see below)
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$$$
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The dependencies are returned as an object like this:
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{{{
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{
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tiddlers: {"tiddlertitle1": true, "tiddlertitle2": false},
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dependentAll: false
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}
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}}}
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The `tiddlers` field is a hashmap of the title of each tiddler that is linked or included in the current one. The value is `true` if the tiddler is a //'fat'// dependency (ie the text is included in some way) or `false` if the tiddler is a //`skinny`// dependency.
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The `dependentAll` field is used to indicate that the tiddler contains a macro that scans the entire pool of tiddlers (for example the `<<list>>` macro), and is potentially dependent on any of them. The effect is that the tiddler should be rerendered whenever any other tiddler changes.
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