mirror of
https://github.com/Jermolene/TiddlyWiki5
synced 2024-09-02 14:32:53 +00:00
310 lines
9.9 KiB
JavaScript
310 lines
9.9 KiB
JavaScript
/*\
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title: $:/core/modules/parsers/wikiparser/wikiparser.js
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type: application/javascript
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module-type: global
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The wiki text parser processes blocks of source text into a parse tree.
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The parse tree is made up of nested arrays of these JavaScript objects:
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{type: "element", tag: <string>, attributes: {}, children: []} - an HTML element
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{type: "text", text: <string>} - a text node
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{type: "entity", value: <string>} - an entity
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{type: "raw", html: <string>} - raw HTML
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Attributes are stored as hashmaps of the following objects:
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{type: "string", value: <string>} - literal string
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{type: "array", value: <string array>} - array of strings
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{type: "styles", value: <object>} - hashmap of style strings
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{type: "indirect", textReference: <textReference>} - indirect through a text reference
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\*/
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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 = function(vocabulary,type,text,options) {
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this.wiki = options.wiki;
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this.vocabulary = vocabulary;
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// Save the parse text
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this.type = type || "text/vnd.tiddlywiki";
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this.source = text || "";
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this.sourceLength = this.source.length;
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// Set current parse position
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this.pos = 0;
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// Initialise the things that pragma rules can change
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this.macroDefinitions = {}; // Hash map of macro definitions
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// Instantiate the pragma parse rules
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this.pragmaRules = this.instantiateRules(this.vocabulary.pragmaRuleClasses,0);
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// Parse any pragmas
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this.parsePragmas();
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// Instantiate the parser block and run rules
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this.blockRules = this.instantiateRules(this.vocabulary.blockRuleClasses,this.pos);
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this.runRules = this.instantiateRules(this.vocabulary.runRuleClasses,this.pos);
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// Parse the text into runs or blocks
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if(this.type === "text/vnd.tiddlywiki-run") {
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this.tree = this.parseRun();
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} else {
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this.tree = this.parseBlocks();
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}
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};
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/*
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Instantiate an array of parse rules
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*/
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WikiParser.prototype.instantiateRules = function(classes,startPos) {
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var rulesInfo = [],
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self = this;
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$tw.utils.each(classes,function(RuleClass) {
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// Instantiate the rule
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var rule = new RuleClass(self);
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rule.init(self);
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var matchIndex = rule.findNextMatch(startPos);
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if(matchIndex !== undefined) {
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rulesInfo.push({
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rule: rule,
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matchIndex: matchIndex
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});
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}
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});
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return rulesInfo;
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};
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/*
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Skip any whitespace at the current position. Options are:
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treatNewlinesAsNonWhitespace: true if newlines are NOT to be treated as whitespace
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*/
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WikiParser.prototype.skipWhitespace = function(options) {
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options = options || {};
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var whitespaceRegExp = options.treatNewlinesAsNonWhitespace ? /([^\S\n]+)/mg : /(\s+)/mg;
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whitespaceRegExp.lastIndex = this.pos;
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var whitespaceMatch = whitespaceRegExp.exec(this.source);
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if(whitespaceMatch && whitespaceMatch.index === this.pos) {
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this.pos = whitespaceRegExp.lastIndex;
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}
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};
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/*
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Get the next match out of an array of parse rule instances
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*/
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WikiParser.prototype.findNextMatch = function(rules,startPos) {
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// Find the best matching rule by finding the closest match position
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var matchingRule = undefined,
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matchingRulePos = this.sourceLength;
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// Step through each rule
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for(var t=0; t<rules.length; t++) {
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var ruleInfo = rules[t];
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// Ask the rule to get the next match if we've moved past the current one
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if(ruleInfo.matchIndex !== undefined && ruleInfo.matchIndex < startPos) {
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ruleInfo.matchIndex = ruleInfo.rule.findNextMatch(startPos);
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}
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// Adopt this match if it's closer than the current best match
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if(ruleInfo.matchIndex !== undefined && ruleInfo.matchIndex <= matchingRulePos) {
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matchingRule = ruleInfo;
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matchingRulePos = ruleInfo.matchIndex;
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}
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}
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return matchingRule;
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};
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/*
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Parse any pragmas at the beginning of a block of parse text
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*/
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WikiParser.prototype.parsePragmas = function() {
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while(true) {
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// Skip whitespace
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this.skipWhitespace();
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// Check for the end of the text
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if(this.pos >= this.sourceLength) {
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return;
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}
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// Check if we've arrived at a pragma rule match
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var nextMatch = this.findNextMatch(this.pragmaRules,this.pos);
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// If not, just exit
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if(!nextMatch || nextMatch.matchIndex !== this.pos) {
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return;
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}
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// Process the pragma rule
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nextMatch.rule.parse();
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}
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};
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/*
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Parse a block from the current position
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terminatorRegExpString: optional regular expression string that identifies the end of plain paragraphs. Must not include capturing parenthesis
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*/
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WikiParser.prototype.parseBlock = function(terminatorRegExpString) {
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var terminatorRegExp = terminatorRegExpString ? new RegExp("(" + terminatorRegExpString + "|\\r?\\n\\r?\\n)","mg") : /(\r?\n\r?\n)/mg;
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this.skipWhitespace();
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if(this.pos >= this.sourceLength) {
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return [];
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}
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// Look for a block rule that applies at the current position
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var nextMatch = this.findNextMatch(this.blockRules,this.pos);
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if(nextMatch && nextMatch.matchIndex === this.pos) {
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return nextMatch.rule.parse();
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}
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// Treat it as a paragraph if we didn't find a block rule
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return [{type: "element", tag: "p", children: this.parseRun(terminatorRegExp)}];
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};
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/*
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Parse a series of blocks of text until a terminating regexp is encountered or the end of the text
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terminatorRegExpString: terminating regular expression
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*/
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WikiParser.prototype.parseBlocks = function(terminatorRegExpString) {
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if(terminatorRegExpString) {
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return this.parseBlocksTerminated(terminatorRegExpString);
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} else {
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return this.parseBlocksUnterminated();
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}
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};
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/*
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Parse a block from the current position to the end of the text
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*/
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WikiParser.prototype.parseBlocksUnterminated = function() {
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var tree = [];
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while(this.pos < this.sourceLength) {
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tree.push.apply(tree,this.parseBlock());
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}
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return tree;
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};
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/*
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Parse blocks of text until a terminating regexp is encountered
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*/
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WikiParser.prototype.parseBlocksTerminated = function(terminatorRegExpString) {
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var terminatorRegExp = new RegExp("(" + terminatorRegExpString + ")","mg"),
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tree = [];
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// Skip any whitespace
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this.skipWhitespace();
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// Check if we've got the end marker
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terminatorRegExp.lastIndex = this.pos;
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var match = terminatorRegExp.exec(this.source);
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// Parse the text into blocks
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while(this.pos < this.sourceLength && !(match && match.index === this.pos)) {
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var blocks = this.parseBlock(terminatorRegExpString);
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tree.push.apply(tree,blocks);
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// Skip any whitespace
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this.skipWhitespace();
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// Check if we've got the end marker
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terminatorRegExp.lastIndex = this.pos;
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match = terminatorRegExp.exec(this.source);
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}
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if(match && match.index === this.pos) {
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this.pos = match.index + match[0].length;
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}
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return tree;
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};
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/*
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Parse a run of text at the current position
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terminatorRegExp: a regexp at which to stop the run
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options: see below
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Options available:
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eatTerminator: move the parse position past any encountered terminator (default false)
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*/
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WikiParser.prototype.parseRun = function(terminatorRegExp,options) {
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if(terminatorRegExp) {
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return this.parseRunTerminated(terminatorRegExp,options);
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} else {
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return this.parseRunUnterminated(options);
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}
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};
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WikiParser.prototype.parseRunUnterminated = function(options) {
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var tree = [];
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// Find the next occurrence of a runrule
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var nextMatch = this.findNextMatch(this.runRules,this.pos);
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// Loop around the matches until we've reached the end of the text
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while(this.pos < this.sourceLength && nextMatch) {
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// Process the text preceding the run rule
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if(nextMatch.matchIndex > this.pos) {
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tree.push({type: "text", text: this.source.substring(this.pos,nextMatch.matchIndex)});
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this.pos = nextMatch.matchIndex;
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}
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// Process the run rule
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tree.push.apply(tree,nextMatch.rule.parse());
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// Look for the next run rule
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nextMatch = this.findNextMatch(this.runRules,this.pos);
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}
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// Process the remaining text
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if(this.pos < this.sourceLength) {
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tree.push({type: "text", text: this.source.substr(this.pos)});
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}
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this.pos = this.sourceLength;
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return tree;
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};
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WikiParser.prototype.parseRunTerminated = function(terminatorRegExp,options) {
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options = options || {};
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var tree = [];
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// Find the next occurrence of the terminator
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terminatorRegExp.lastIndex = this.pos;
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var terminatorMatch = terminatorRegExp.exec(this.source);
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// Find the next occurrence of a runrule
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var runRuleMatch = this.findNextMatch(this.runRules,this.pos);
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// Loop around until we've reached the end of the text
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while(this.pos < this.sourceLength && (terminatorMatch || runRuleMatch)) {
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// Return if we've found the terminator, and it precedes any run rule match
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if(terminatorMatch) {
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if(!runRuleMatch || runRuleMatch.matchIndex >= terminatorMatch.index) {
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if(terminatorMatch.index > this.pos) {
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tree.push({type: "text", text: this.source.substring(this.pos,terminatorMatch.index)});
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}
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this.pos = terminatorMatch.index;
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if(options.eatTerminator) {
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this.pos += terminatorMatch[0].length;
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}
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return tree;
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}
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}
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// Process any run rule, along with the text preceding it
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if(runRuleMatch) {
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// Preceding text
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if(runRuleMatch.matchIndex > this.pos) {
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tree.push({type: "text", text: this.source.substring(this.pos,runRuleMatch.matchIndex)});
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this.pos = runRuleMatch.matchIndex;
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}
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// Process the run rule
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tree.push.apply(tree,runRuleMatch.rule.parse());
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// Look for the next run rule
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runRuleMatch = this.findNextMatch(this.runRules,this.pos);
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// Look for the next terminator match
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terminatorRegExp.lastIndex = this.pos;
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terminatorMatch = terminatorRegExp.exec(this.source);
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}
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}
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// Process the remaining text
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if(this.pos < this.sourceLength) {
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tree.push({type: "text", text: this.source.substr(this.pos)});
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}
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this.pos = this.sourceLength;
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return tree;
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};
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/*
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Parse zero or more class specifiers `.classname`
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*/
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WikiParser.prototype.parseClasses = function() {
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var classRegExp = /\.([^\s\.]+)/mg,
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classNames = [];
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classRegExp.lastIndex = this.pos;
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var match = classRegExp.exec(this.source);
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while(match && match.index === this.pos) {
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this.pos = match.index + match[0].length;
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classNames.push(match[1]);
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var match = classRegExp.exec(this.source);
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}
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return classNames;
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};
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exports.WikiParser = WikiParser;
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})();
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