mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/VisualEditor
synced 2024-12-01 17:36:35 +00:00
487 lines
15 KiB
JavaScript
487 lines
15 KiB
JavaScript
/**
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* Template and template argument handling, first cut.
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*
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* AsyncTokenTransformManager objects provide preprocessor-frame-like
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* functionality once template args etc are fully expanded, and isolate
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* individual transforms from concurrency issues. Template expansion is
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* controlled using a tplExpandData structure created independently for each
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* handled template tag.
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*
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* @author Gabriel Wicke <gwicke@wikimedia.org>
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* @author Brion Vibber <brion@wikimedia.org>
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*/
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var $ = require('jquery'),
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request = require('request'),
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events = require('events'),
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qs = require('querystring'),
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ParserFunctions = require('./ext.core.ParserFunctions.js').ParserFunctions,
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AttributeTransformManager = require('./mediawiki.TokenTransformManager.js')
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.AttributeTransformManager,
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defines = require('./mediawiki.parser.defines.js');
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function TemplateHandler ( manager ) {
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this.register( manager );
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this.parserFunctions = new ParserFunctions( manager );
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}
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// constants
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TemplateHandler.prototype.rank = 1.1;
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TemplateHandler.prototype.register = function ( manager ) {
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this.manager = manager;
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// Register for template and templatearg tag tokens
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manager.addTransform( this.onTemplate.bind(this),
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this.rank, 'tag', 'template' );
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// Template argument expansion
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manager.addTransform( this.onTemplateArg.bind(this),
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this.rank, 'tag', 'templatearg' );
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};
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/**
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* Main template token handler
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*
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* Expands target and arguments (both keys and values) and either directly
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* calls or sets up the callback to _expandTemplate, which then fetches and
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* processes the template.
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*/
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TemplateHandler.prototype.onTemplate = function ( token, frame, cb ) {
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//console.warn('onTemplate! ' + JSON.stringify( token, null, 2 ) +
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// ' args: ' + JSON.stringify( this.manager.args ));
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// expand argument keys, with callback set to next processing step
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// XXX: would likely be faster to do this in a tight loop here
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var atm = new AttributeTransformManager(
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this.manager,
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this._expandTemplate.bind( this, token, frame, cb )
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);
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cb( { async: true } );
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atm.processKeys( token.attribs );
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};
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/**
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* Create positional (number) keys for arguments without explicit keys
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*/
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TemplateHandler.prototype._nameArgs = function ( attribs ) {
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var n = 1,
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out = [];
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for ( var i = 0, l = attribs.length; i < l; i++ ) {
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// FIXME: Also check for whitespace-only named args!
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if ( ! attribs[i].k.length ) {
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out.push( new KV( n.toString(), attribs[i].v ) );
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n++;
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} else {
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out.push( attribs[i] );
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}
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}
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this.manager.env.dp( '_nameArgs: ', out );
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return out;
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};
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/**
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* Fetch, tokenize and token-transform a template after all arguments and the
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* target were expanded.
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*/
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TemplateHandler.prototype._expandTemplate = function ( token, frame, cb, attribs ) {
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//console.warn('TemplateHandler.expandTemplate: ' +
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// JSON.stringify( tplExpandData, null, 2 ) );
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var target = attribs[0].k;
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if ( ! target ) {
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this.manager.env.ap( 'No target! ', attribs );
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console.trace();
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}
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// TODO:
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// check for 'subst:'
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// check for variable magic names
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// check for msg, msgnw, raw magics
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// check for parser functions
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// First, check the target for loops
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target = this.manager.env.tokensToString( target ).trim();
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//var args = this.manager.env.KVtoHash( tplExpandData.expandedArgs );
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// strip subst for now.
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target = target.replace( /^(safe)?subst:/, '' );
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// XXX: wrap attribs in object with .dict() and .named() methods,
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// and each member (key/value) into object with .tokens(), .dom() and
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// .wikitext() methods (subclass of Array)
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var prefix = target.split(':', 1)[0].toLowerCase().trim();
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if ( prefix && 'pf_' + prefix in this.parserFunctions ) {
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var pfAttribs = new Params( this.manager.env, attribs );
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pfAttribs[0] = new KV( target.substr( prefix.length + 1 ), [] );
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//this.manager.env.dp( 'func prefix/args: ', prefix,
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// tplExpandData.expandedArgs,
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// 'unnamedArgs', tplExpandData.origToken.attribs,
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// 'funcArg:', funcArg
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// );
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this.manager.env.dp( 'entering prefix', target, token );
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this.parserFunctions[ 'pf_' + prefix ]
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( token, this.manager.frame, cb, pfAttribs );
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return;
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}
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this.manager.env.tp( 'template target: ' + target );
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// now normalize the target before template processing
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target = this.manager.env.normalizeTitle( target );
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// Resolve a possibly relative link
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var templateName = this.manager.env.resolveTitle(
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target,
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'Template'
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);
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var checkRes = this.manager.frame.loopAndDepthCheck( templateName, this.manager.env.maxDepth );
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if( checkRes ) {
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// Loop detected or depth limit exceeded, abort!
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res = [
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checkRes,
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new TagTk( 'a', [{k: 'href', v: target}] ),
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templateName,
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new EndTagTk( 'a' )
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];
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res.rank = this.manager.phaseEndRank;
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cb( { tokens: res } );
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return;
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}
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// XXX: notes from brion's mediawiki.parser.environment
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// resolve template name
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// load template w/ canonical name
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// load template w/ variant names (language variants)
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// For now, just fetch the template and pass the callback for further
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// processing along.
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this._fetchTemplateAndTitle(
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templateName,
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cb,
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this._processTemplateAndTitle.bind( this, token, frame, cb, templateName, attribs )
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);
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};
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/**
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* Process a fetched template source
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*/
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TemplateHandler.prototype._processTemplateAndTitle = function( token, frame, cb, name, attribs, src, type ) {
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// Get a nested transformation pipeline for the input type. The input
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// pipeline includes the tokenizer, synchronous stage-1 transforms for
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// 'text/wiki' input and asynchronous stage-2 transforms).
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var pipeline = this.manager.pipeFactory.getPipeline(
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type || 'text/x-mediawiki', true
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);
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pipeline.setFrame( this.manager.frame, name, attribs );
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// Hook up the inputPipeline output events to our handlers
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pipeline.addListener( 'chunk', this._onChunk.bind ( this, cb ) );
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pipeline.addListener( 'end', this._onEnd.bind ( this, cb ) );
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// Feed the pipeline. XXX: Support different formats.
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this.manager.env.dp( 'TemplateHandler._processTemplateAndTitle', name, attribs );
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pipeline.process ( src, name );
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};
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/**
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* Handle chunk emitted from the input pipeline after feeding it a template
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*/
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TemplateHandler.prototype._onChunk = function( cb, chunk ) {
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// We encapsulate the output by default, so collect tokens here.
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chunk = this.manager.env.stripEOFTkfromTokens( chunk );
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this.manager.env.dp( 'TemplateHandler._onChunk', chunk );
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cb( { tokens: chunk, async: true } );
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};
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/**
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* Handle the end event emitted by the parser pipeline after fully processing
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* the template source.
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*/
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TemplateHandler.prototype._onEnd = function( cb ) {
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this.manager.env.dp( 'TemplateHandler._onEnd' );
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cb( { tokens: [] } );
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};
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/**
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* Fetch a template
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*/
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TemplateHandler.prototype._fetchTemplateAndTitle = function ( title, parentCB, cb ) {
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// @fixme normalize name?
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var self = this;
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if ( title in this.manager.env.pageCache ) {
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// XXX: store type too (and cache tokens/x-mediawiki)
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cb( self.manager.env.pageCache[title] /* , type */ );
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} else if ( ! this.manager.env.fetchTemplates ) {
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parentCB( { tokens: [ 'Warning: Page/template fetching disabled, and no cache for ' +
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title ] } );
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} else {
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// We are about to start an async request for a template
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this.manager.env.dp( 'Note: trying to fetch ', title );
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// Start a new request if none is outstanding
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//this.manager.env.dp( 'requestQueue: ', this.manager.env.requestQueue );
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if ( this.manager.env.requestQueue[title] === undefined ) {
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this.manager.env.tp( 'Note: Starting new request for ' + title );
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this.manager.env.requestQueue[title] = new TemplateRequest( this.manager, title );
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}
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// Append a listener to the request at the toplevel, but prepend at
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// lower levels to enforce depth-first processing
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if ( false && this.manager.isInclude ) {
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// prepend request: deal with requests from includes first
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this.manager.env.requestQueue[title]
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.listeners( 'src' ).unshift( cb );
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} else {
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// append request, process in document order
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this.manager.env.requestQueue[title]
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.listeners( 'src' ).push( cb );
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}
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parentCB ( { async: true } );
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}
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};
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/*********************** Template argument expansion *******************/
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/**
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* Expand template arguments with tokens from the containing frame.
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*/
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TemplateHandler.prototype.onTemplateArg = function ( token, frame, cb ) {
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new AttributeTransformManager (
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this.manager,
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this._returnArgAttributes.bind( this, token, cb, frame )
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).process( token.attribs.slice() );
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};
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TemplateHandler.prototype._returnArgAttributes = function ( token, cb, frame, attributes ) {
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//console.warn( '_returnArgAttributes: ' + JSON.stringify( attributes ));
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var argName = this.manager.env.tokensToString( attributes[0].k ).trim(),
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res,
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dict = this.manager.frame.args.named();
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this.manager.env.dp( 'args', argName /*, dict*/ );
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if ( argName in dict ) {
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// return tokens for argument
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//console.warn( 'templateArg found: ' + argName +
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// ' vs. ' + JSON.stringify( this.manager.args ) );
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res = dict[argName];
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this.manager.env.dp( 'arg res:', res );
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if ( res.constructor === String ) {
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cb( { tokens: [res] } );
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} else {
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dict[argName].get({
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type: 'tokens/x-mediawiki/expanded',
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cb: function( res ) { cb ( { tokens: res } ); },
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asyncCB: cb
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});
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}
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return;
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} else {
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this.manager.env.dp( 'templateArg not found: ', argName
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/*' vs. ', dict */ );
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if ( attributes.length > 1 ) {
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res = attributes[1].v;
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} else {
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//console.warn('no default for ' + argName + JSON.stringify( attributes ));
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res = [ '{{{' + argName + '}}}' ];
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}
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}
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cb( { tokens: res } );
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};
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/***************** Template fetch request helper class ********/
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function TemplateRequest ( manager, title ) {
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// Increase the number of maximum listeners a bit..
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this.setMaxListeners( 50000 );
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this.retries = 5;
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this.manager = manager;
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this.title = title;
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var url = manager.env.wgScript + '/api' +
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manager.env.wgScriptExtension +
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'?' +
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qs.stringify( {
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format: 'json',
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action: 'query',
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prop: 'revisions',
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rvprop: 'content',
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titles: title
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} );
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//'?format=json&action=query&prop=revisions&rvprop=content&titles=' + title;
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this.requestOptions = {
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method: 'GET',
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followRedirect: true,
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url: url,
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headers: {
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'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64; rv:9.0.1) ' +
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'Gecko/20100101 Firefox/9.0.1 Iceweasel/9.0.1'
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}
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};
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// Start the request
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request( this.requestOptions, this._handler.bind(this) );
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}
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// Inherit from EventEmitter
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TemplateRequest.prototype = new events.EventEmitter();
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TemplateRequest.prototype.constructor = TemplateRequest;
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TemplateRequest.prototype._handler = function (error, response, body) {
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//console.warn( 'response for ' + title + ' :' + body + ':' );
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if(error) {
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this.manager.env.dp(error);
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if ( this.retries ) {
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this.retries--;
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this.manager.env.tp( 'Retrying template request for ' + this.title );
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var self = this;
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// retry
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request( this.requestOptions, this._handler.bind(this) );
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} else {
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this.emit('src', 'Page/template fetch failure for title ' + this.title,
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'text/x-mediawiki');
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}
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} else if(response.statusCode === 200) {
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var src = '',
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data,
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normalizedTitle;
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try {
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//console.warn( 'body: ' + body );
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data = JSON.parse( body );
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} catch(e) {
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console.warn( "Error: while parsing result. Error was: " );
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console.warn( e );
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console.warn( "Response that didn't parse was:");
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console.warn( "------------------------------------------\n" + body );
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console.warn( "------------------------------------------" );
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}
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try {
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$.each( data.query.pages, function(i, page) {
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if (page.revisions && page.revisions.length) {
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src = page.revisions[0]['*'];
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normalizeTitle = page.title;
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} else {
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console.warn( 'Did not find page revisions for ' + this.title );
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src = 'No revisions for ' + this.title;
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}
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});
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} catch ( e2 ) {
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console.warn( 'Did not find page revisions in the returned body:' + body );
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src = 'No content for ' + this.title;
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}
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// check for #REDIRECT
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var redirMatch = src.match( /[\r\n\s]*#\s*redirect\s*\[\[([^\]]+)\]\]/i )
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if ( redirMatch ) {
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var title = redirMatch[1];
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var url = this.manager.env.wgScript + '/api' +
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this.manager.env.wgScriptExtension +
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'?' +
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qs.stringify( {
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format: 'json',
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action: 'query',
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prop: 'revisions',
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rvprop: 'content',
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titles: title
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} );
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//'?format=json&action=query&prop=revisions&rvprop=content&titles=' + title;
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this.requestOptions.url = url;
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request( this.requestOptions, this._handler.bind(this) );
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return;
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}
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//console.warn( 'Page ' + title + ': got ' + src );
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this.manager.env.tp( 'Retrieved ' + this.title, src );
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// Add the source to the cache
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this.manager.env.pageCache[this.title] = src;
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// Process only a few callbacks in each event loop iteration to
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// reduce memory usage.
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//
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//
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var listeners = this.listeners( 'src' );
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var processSome = function () {
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// XXX: experiment a bit with the number of callbacks per
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// iteration!
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var maxIters = Math.min(1, listeners.length);
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for ( var it = 0; it < maxIters; it++ ) {
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var nextListener = listeners.shift();
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// We only retrieve text/x-mediawiki source currently.
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nextListener( src, 'text/x-mediawiki' );
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}
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if ( listeners.length ) {
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process.nextTick( processSome );
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}
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};
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process.nextTick( processSome );
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//processSome();
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//self.emit( 'src', src, title );
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}
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// XXX: handle other status codes
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// Remove self from request queue
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//this.manager.env.dp( 'trying to remove ', this.title, ' from requestQueue' );
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delete this.manager.env.requestQueue[this.title];
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//this.manager.env.dp( 'after deletion:', this.manager.env.requestQueue );
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};
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/*
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* XXX: The jQuery version does not quite work with node, but we keep
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* it around for now.
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$.ajax({
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url: url,
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data: {
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format: 'json',
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action: 'query',
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prop: 'revisions',
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rvprop: 'content',
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titles: title
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},
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success: function(data, statusString, xhr) {
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console.warn( 'Page ' + title + ' success ' + JSON.stringify( data ) );
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var src = null, title = null;
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$.each(data.query.pages, function(i, page) {
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if (page.revisions && page.revisions.length) {
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src = page.revisions[0]['*'];
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title = page.title;
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}
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});
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if (typeof src !== 'string') {
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console.warn( 'Page ' + title + 'not found! Got ' + src );
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callback( 'Page ' + title + ' not found' );
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} else {
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// Add to cache
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console.warn( 'Page ' + title + ': got ' + src );
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this.manager.env.pageCache[title] = src;
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callback(src, title);
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}
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},
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error: function(xhr, msg, err) {
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console.warn( 'Page/template fetch failure for title ' +
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title + ', url=' + url + JSON.stringify(xhr) + ', err=' + err );
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callback('Page/template fetch failure for title ' + title);
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},
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dataType: 'json',
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cache: false, // @fixme caching, versions etc?
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crossDomain: true
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});
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*/
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if (typeof module == "object") {
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module.exports.TemplateHandler = TemplateHandler;
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}
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