mirror of
https://github.com/Jermolene/TiddlyWiki5
synced 2024-08-19 06:06:17 +00:00
173 lines
5.7 KiB
JavaScript
173 lines
5.7 KiB
JavaScript
/*\
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title: js/WikiTextParser.js
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Parses a block of tiddlywiki-format wiki text into a parse tree object.
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\*/
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(function(){
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/*jslint node: true */
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"use strict";
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var WikiTextRules = require("./WikiTextRules.js"),
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WikiTextParseTree = require("./WikiTextParseTree.js").WikiTextParseTree,
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utils = require("./Utils.js"),
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util = require("util");
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/*
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Creates a new instance of the wiki text parser with the specified options. The
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options are a hashmap of mandatory members as follows:
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store: The store object to use to parse any cascaded content (eg transclusion)
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Planned:
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enableRules: An array of names of wiki text rules to enable. If not specified, all rules are available
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extraRules: An array of additional rule handlers to add
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enableMacros: An array of names of macros to enable. If not specified, all macros are available
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extraMacros: An array of additional macro handlers to add
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*/
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var WikiTextParser = function(options) {
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this.store = options.store;
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this.autoLinkWikiWords = true;
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this.rules = WikiTextRules.rules;
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var pattern = [];
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for(var n=0; n<this.rules.length; n++) {
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pattern.push("(" + this.rules[n].match + ")");
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}
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this.rulesRegExp = new RegExp(pattern.join("|"),"mg");
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};
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WikiTextParser.prototype.parse = function(text) {
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this.source = text;
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this.nextMatch = 0;
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this.children = [];
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this.dependencies = [];
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this.output = null;
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this.subWikify(this.children);
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var tree = new WikiTextParseTree(this.children,this.dependencies,this.store);
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this.source = null;
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this.children = null;
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return tree;
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};
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WikiTextParser.prototype.addDependency = function(dependency) {
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if(dependency === null) {
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this.dependencies = null;
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} else if(this.dependencies && this.dependencies.indexOf(dependency) === -1) {
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this.dependencies.push(dependency);
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}
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};
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WikiTextParser.prototype.outputText = function(place,startPos,endPos) {
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if(startPos < endPos) {
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place.push({type: "text", value: this.source.substring(startPos,endPos)});
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}
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};
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WikiTextParser.prototype.subWikify = function(output,terminator) {
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// Handle the terminated and unterminated cases separately, this speeds up wikifikation by about 30%
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if(terminator)
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this.subWikifyTerm(output,new RegExp("(" + terminator + ")","mg"));
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else
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this.subWikifyUnterm(output);
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};
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WikiTextParser.prototype.subWikifyUnterm = function(output) {
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// subWikify can be indirectly recursive, so we need to save the old output pointer
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var oldOutput = this.output;
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this.output = output;
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// Get the first match
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this.rulesRegExp.lastIndex = this.nextMatch;
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var ruleMatch = this.rulesRegExp.exec(this.source);
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while(ruleMatch) {
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// Output any text before the match
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if(ruleMatch.index > this.nextMatch)
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this.outputText(this.output,this.nextMatch,ruleMatch.index);
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// Set the match parameters for the handler
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this.matchStart = ruleMatch.index;
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this.matchLength = ruleMatch[0].length;
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this.matchText = ruleMatch[0];
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this.nextMatch = this.rulesRegExp.lastIndex;
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// Figure out which rule matched and call its handler
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var t;
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for(t=1; t<ruleMatch.length; t++) {
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if(ruleMatch[t]) {
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this.rules[t-1].handler(this);
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this.rulesRegExp.lastIndex = this.nextMatch;
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break;
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}
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}
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// Get the next match
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ruleMatch = this.rulesRegExp.exec(this.source);
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}
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// Output any text after the last match
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if(this.nextMatch < this.source.length) {
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this.outputText(this.output,this.nextMatch,this.source.length);
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this.nextMatch = this.source.length;
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}
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// Restore the output pointer
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this.output = oldOutput;
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};
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WikiTextParser.prototype.subWikifyTerm = function(output,terminatorRegExp) {
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// subWikify can be indirectly recursive, so we need to save the old output pointer
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var oldOutput = this.output;
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this.output = output;
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// Get the first matches for the rule and terminator RegExps
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terminatorRegExp.lastIndex = this.nextMatch;
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var terminatorMatch = terminatorRegExp.exec(this.source);
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this.rulesRegExp.lastIndex = this.nextMatch;
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var ruleMatch = this.rulesRegExp.exec(terminatorMatch ? this.source.substr(0,terminatorMatch.index) : this.source);
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while(terminatorMatch || ruleMatch) {
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// Check for a terminator match before the next rule match
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if(terminatorMatch && (!ruleMatch || terminatorMatch.index <= ruleMatch.index)) {
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// Output any text before the match
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if(terminatorMatch.index > this.nextMatch)
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this.outputText(this.output,this.nextMatch,terminatorMatch.index);
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// Set the match parameters
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this.matchText = terminatorMatch[1];
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this.matchLength = terminatorMatch[1].length;
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this.matchStart = terminatorMatch.index;
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this.nextMatch = this.matchStart + this.matchLength;
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// Restore the output pointer
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this.output = oldOutput;
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return;
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}
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// It must be a rule match; output any text before the match
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if(ruleMatch.index > this.nextMatch)
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this.outputText(this.output,this.nextMatch,ruleMatch.index);
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// Set the match parameters
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this.matchStart = ruleMatch.index;
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this.matchLength = ruleMatch[0].length;
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this.matchText = ruleMatch[0];
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this.nextMatch = this.rulesRegExp.lastIndex;
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// Figure out which rule matched and call its handler
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var t;
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for(t=1; t<ruleMatch.length; t++) {
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if(ruleMatch[t]) {
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this.rules[t-1].handler(this);
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this.rulesRegExp.lastIndex = this.nextMatch;
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break;
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}
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}
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// Get the next match
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terminatorRegExp.lastIndex = this.nextMatch;
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terminatorMatch = terminatorRegExp.exec(this.source);
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ruleMatch = this.rulesRegExp.exec(terminatorMatch ? this.source.substr(0,terminatorMatch.index) : this.source);
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}
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// Output any text after the last match
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if(this.nextMatch < this.source.length) {
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this.outputText(this.output,this.nextMatch,this.source.length);
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this.nextMatch = this.source.length;
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}
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// Restore the output pointer
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this.output = oldOutput;
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};
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exports.WikiTextParser = WikiTextParser;
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})();
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