mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/VisualEditor
synced 2024-11-15 18:39:52 +00:00
279 lines
8 KiB
JavaScript
279 lines
8 KiB
JavaScript
/**
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* Tokenizer for wikitext, using PEG.js and a separate PEG grammar file
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* (pegTokenizer.pegjs.txt)
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*
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* Use along with a HTML5TreeBuilder and the DOMPostProcessor(s) for HTML
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* output.
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*
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*/
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var PEG = require('pegjs'),
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path = require('path'),
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LRU = require("lru-cache"),
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fs = require('fs'),
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$ = require('jquery'),
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events = require('events'),
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//colors = require('colors'),
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defines = require('./mediawiki.parser.defines.js');
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function PegTokenizer( env, canCache ) {
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this.env = env;
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this.canCache = canCache;
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if ( this.canCache ) {
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this.cacheAccum = { chunks: [] };
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}
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}
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// Inherit from EventEmitter
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PegTokenizer.prototype = new events.EventEmitter();
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PegTokenizer.prototype.constructor = PegTokenizer;
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PegTokenizer.src = false;
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/*
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* The main worker. Sets up event emission ('chunk' and 'end' events).
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* Consumers are supposed to register with PegTokenizer before calling
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* process().
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*/
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PegTokenizer.prototype.process = function( text, cacheKey ) {
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var out, err;
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if ( !this.tokenizer ) {
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// Construct a singleton static tokenizer.
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var pegSrcPath = path.join( __dirname, 'pegTokenizer.pegjs.txt' );
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this.src = fs.readFileSync( pegSrcPath, 'utf8' );
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var tokenizerSource = PEG.buildParser(this.src,
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{ cache: true, trackLineAndColumn: false }).toSource();
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/* We patch the generated source to assign the arguments array for the
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* parse function to a function-scoped variable. We use this to pass
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* in callbacks and other information, which can be used from actions
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* run when matching a production. In particular, we pass in a
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* callback called for a chunk of tokens in toplevelblock. Setting this
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* callback per call to parse() keeps the tokenizer reentrant, so that it
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* can be reused to expand templates while a main parse is ongoing.
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* PEG tokenizer construction is very expensive, so having a single
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* reentrant tokenizer is a big win.
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*
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* We could also make modules available to the tokenizer by prepending
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* requires to the source.
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*/
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tokenizerSource = tokenizerSource.replace( 'parse: function(input, startRule) {',
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'parse: function(input, startRule) { var __parseArgs = arguments;' );
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//console.warn( tokenizerSource );
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PegTokenizer.prototype.tokenizer = eval( tokenizerSource );
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// alias the parse method
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this.tokenizer.tokenize = this.tokenizer.parse;
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// Also, while we are at it, create a tokenizer cache.
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PegTokenizer.prototype.cache = LRU(20);
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}
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if ( this.canCache ) {
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var maybeCached = this.cache.get(cacheKey);
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if ( maybeCached ) {
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this.env.tp( 'tokenizer cache hit for ' + cacheKey );
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//console.warn( JSON.stringify( maybeCached, null, 2 ) );
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for ( var i = 0, l = maybeCached.length; i < l; i++ ) {
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// emit a clone of this chunk
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this.emit('chunk', this.env.cloneTokens( maybeCached[i] ));
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}
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this.emit('end');
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return;
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} else {
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this.cacheAccum.key = cacheKey;
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}
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}
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// Some input normalization: force a trailing newline
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if ( text.substring(text.length - 1) !== "\n" ) {
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text += "\n";
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}
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// XXX: Commented out exception handling during development to get
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// reasonable traces.
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//try {
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var chunkCB;
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if ( this.canCache ) {
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chunkCB = this.onCacheChunk.bind( this );
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} else {
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chunkCB = this.emit.bind( this, 'chunk' );
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}
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this.tokenizer.tokenize(text, 'start',
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// callback
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chunkCB,
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// inline break test
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this
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);
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this.onEnd();
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/*} catch (e) {
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err = e;
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console.warn( e );
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console.trace();
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}*/
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};
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PegTokenizer.prototype.onCacheChunk = function ( chunk ) {
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// make a deep copy of the chunk for now
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this.cacheAccum.chunks.push( chunk.slice() );
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//console.warn( 'onCacheChunk: ' + this.cacheAccum.key + JSON.stringify( chunk, null, 2 ) );
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this.emit('chunk', chunk);
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};
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PegTokenizer.prototype.onEnd = function ( ) {
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if ( this.canCache ) {
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this.cache.set(this.cacheAccum.key, this.cacheAccum.chunks);
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// reset cacheAccum
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this.cacheAccum = { chunks: [] };
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}
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this.emit('end');
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};
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PegTokenizer.prototype.processImageOptions = function( text ) {
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return this.tokenizer.tokenize(text, 'img_options', null, this );
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};
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/**
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* Tokenize a URL
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*/
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PegTokenizer.prototype.tokenizeURL = function( text ) {
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try {
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return this.tokenizer.tokenize(text, 'url', null, this );
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} catch ( e ) {
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return false;
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}
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};
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/*
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* Inline breaks, flag-enabled production which detects end positions for
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* active higher-level productions in inline and other nested productions.
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* Those inner productions are then exited, so that the outer production can
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* handle the end marker.
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*/
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PegTokenizer.prototype.inline_breaks = function (input, pos, stops ) {
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var counters = stops.counters;
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switch( input[pos] ) {
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case '=':
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return stops.onStack( 'equal' ) ||
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( counters.h &&
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input.substr( pos + 1, 200)
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.match(/[ \t]*[\r\n]/) !== null ) || null;
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case '|':
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return counters.pipe ||
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counters.template ||
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counters.linkdesc ||
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( stops.onStack('table') &&
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( input[pos + 1].match(/[|}]/) !== null ||
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counters.tableCellArg
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)
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) || null;
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case '{':
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// {{!}} pipe templates..
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return (
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counters.pipe ||
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( stops.onStack( 'table' ) &&
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(
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input.substr(pos, 10) === '{{!}}{{!}}' ||
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counters.tableCellArg
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)
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)
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) && input.substr( pos, 5 ) === '{{!}}' || null;
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case "!":
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return stops.onStack( 'table' ) && input[pos + 1] === "!" ||
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null;
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case "}":
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return counters.template && input[pos + 1] === "}" || null;
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case ":":
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return counters.colon &&
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! stops.onStack( 'extlink' ) &&
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! counters.linkdesc || null;
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case "\r":
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return stops.onStack( 'table' ) &&
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input.substr(pos, 4).match(/\r\n?[!|]/) !== null ||
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null;
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case "\n":
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return stops.onStack( 'table' ) &&
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input[pos + 1] === '!' ||
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input[pos + 1] === '|' ||
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null;
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case "]":
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return stops.onStack( 'extlink' ) ||
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( counters.linkdesc && input[pos + 1] === ']' ) ||
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null;
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case "<":
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return ( counters.pre && input.substr( pos, 6 ) === '<pre>' ) ||
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( counters.noinclude && input.substr(pos, 12) === '</noinclude>' ) ||
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( counters.includeonly && input.substr(pos, 14) === '</includeonly>' ) ||
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( counters.onlyinclude && input.substr(pos, 14) === '</onlyinclude>' ) ||
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null;
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default:
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return null;
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}
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};
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// Alternate version of the above. The hash is likely faster, but the nested
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// function calls seem to cancel that out.
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PegTokenizer.prototype.breakMap = {
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'=': function(input, pos, syntaxFlags) {
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return syntaxFlags.equal ||
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( syntaxFlags.h &&
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input.substr( pos + 1, 200)
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.match(/[ \t]*[\r\n]/) !== null ) || null;
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},
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'|': function ( input, pos, syntaxFlags ) {
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return syntaxFlags.template ||
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syntaxFlags.linkdesc ||
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( syntaxFlags.table &&
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(
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input[pos + 1].match(/[|}]/) !== null ||
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syntaxFlags.tableCellArg
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)
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) || null;
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},
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"!": function ( input, pos, syntaxFlags ) {
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return syntaxFlags.table && input[pos + 1] === "!" ||
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null;
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},
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"}": function ( input, pos, syntaxFlags ) {
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return syntaxFlags.template && input[pos + 1] === "}" || null;
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},
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":": function ( input, pos, syntaxFlags ) {
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return syntaxFlags.colon &&
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! syntaxFlags.extlink &&
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! syntaxFlags.linkdesc || null;
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},
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"\r": function ( input, pos, syntaxFlags ) {
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return syntaxFlags.table &&
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input.substr(pos, 4).match(/\r\n?[!|]/) !== null ||
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null;
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},
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"\n": function ( input, pos, syntaxFlags ) {
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return syntaxFlags.table &&
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input[pos + 1] === '!' ||
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input[pos + 1] === '|' ||
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null;
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},
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"]": function ( input, pos, syntaxFlags ) {
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return syntaxFlags.extlink ||
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( syntaxFlags.linkdesc && input[pos + 1] === ']' ) ||
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null;
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},
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"<": function ( input, pos, syntaxFlags ) {
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return syntaxFlags.pre && input.substr( pos, 6 ) === '</pre>' || null;
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}
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};
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PegTokenizer.prototype.inline_breaks_hash = function (input, pos, syntaxFlags ) {
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return this.breakMap[ input[pos] ]( input, pos, syntaxFlags);
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//console.warn( 'ilbn res: ' + JSON.stringify( [ res, input.substr( pos, 4 ) ] ) );
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//return res;
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};
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if (typeof module == "object") {
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module.exports.PegTokenizer = PegTokenizer;
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}
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