688 lines
19 KiB
JavaScript
688 lines
19 KiB
JavaScript
/*\
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title: $:/core/modules/wiki.js
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type: application/javascript
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module-type: wikimethod
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Extension methods for the $tw.Wiki object
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Adds the following properties to the wiki object:
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* `eventListeners` is a hashmap by type of arrays of listener functions
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* `changedTiddlers` is a hashmap describing changes to named tiddlers since wiki change events were
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last dispatched. Each entry is a hashmap containing two fields:
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modified: true/false
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deleted: true/false
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* `changeCount` is a hashmap by tiddler title containing a numerical index that starts at zero and is
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incremented each time a tiddler is created changed or deleted
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* `caches` is a hashmap by tiddler title containing a further hashmap of named cache objects. Caches
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are automatically cleared when a tiddler is modified or deleted
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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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/*
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Get the value of a text reference. Text references can have any of these forms:
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<tiddlertitle>
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<tiddlertitle>!!<fieldname>
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!!<fieldname> - specifies a field of the current tiddlers
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<tiddlertitle>##<field>
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*/
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exports.getTextReference = function(textRef,defaultText,currTiddlerTitle) {
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var tr = $tw.utils.parseTextReference(textRef),
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title = tr.title || currTiddlerTitle;
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if(tr.field) {
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var tiddler = this.getTiddler(title);
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if(tiddler && $tw.utils.hop(tiddler.fields,tr.field)) {
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return tiddler.fields[tr.field];
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} else {
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return defaultText;
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}
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} else if(tr.index) {
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return this.extractTiddlerDataItem(title,tr.index,defaultText);
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} else {
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return this.getTiddlerText(title,defaultText);
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}
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};
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exports.setTextReference = function(textRef,value,currTiddlerTitle) {
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var tr = $tw.utils.parseTextReference(textRef),
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title,tiddler,fields;
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// Check if it is a reference to a tiddler
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if(tr.title && !tr.field) {
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tiddler = this.getTiddler(tr.title);
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this.addTiddler(new $tw.Tiddler(tiddler,{title: tr.title,text: value}));
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// Else check for a field reference
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} else if(tr.field) {
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title = tr.title || currTiddlerTitle;
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tiddler = this.getTiddler(title);
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if(tiddler) {
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fields = {};
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fields[tr.field] = value;
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this.addTiddler(new $tw.Tiddler(tiddler,fields));
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}
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}
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};
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exports.deleteTextReference = function(textRef,currTiddlerTitle) {
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var tr = $tw.utils.parseTextReference(textRef),
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title,tiddler,fields;
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// Check if it is a reference to a tiddler
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if(tr.title && !tr.field) {
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this.deleteTiddler(tr.title);
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// Else check for a field reference
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} else if(tr.field) {
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title = tr.title || currTiddlerTitle;
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tiddler = this.getTiddler(title);
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if(tiddler && $tw.utils.hop(tiddler.fields,tr.field)) {
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fields = {};
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fields[tr.field] = undefined;
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this.addTiddler(new $tw.Tiddler(tiddler,fields));
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}
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}
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};
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exports.addEventListener = function(type,listener) {
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this.eventListeners = this.eventListeners || {};
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this.eventListeners[type] = this.eventListeners[type] || [];
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this.eventListeners[type].push(listener);
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};
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exports.removeEventListener = function(type,listener) {
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var listeners = this.eventListeners[type];
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if(listeners) {
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var p = listeners.indexOf(listener);
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if(p !== -1) {
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listeners.splice(p,1);
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}
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}
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};
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exports.dispatchEvent = function(type /*, args */) {
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var args = Array.prototype.slice.call(arguments,1),
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listeners = this.eventListeners[type];
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if(listeners) {
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for(var p=0; p<listeners.length; p++) {
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var listener = listeners[p];
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listener.apply(listener,args);
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}
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}
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};
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/*
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Causes a tiddler to be marked as changed, incrementing the change count, and triggers event handlers.
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This method should be called after the changes it describes have been made to the wiki.tiddlers[] array.
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title: Title of tiddler
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isDeleted: defaults to false (meaning the tiddler has been created or modified),
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true if the tiddler has been created
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*/
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exports.enqueueTiddlerEvent = function(title,isDeleted) {
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// Record the touch in the list of changed tiddlers
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this.changedTiddlers = this.changedTiddlers || {};
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this.changedTiddlers[title] = this.changedTiddlers[title] || [];
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this.changedTiddlers[title][isDeleted ? "deleted" : "modified"] = true;
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// Increment the change count
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this.changeCount = this.changeCount || {};
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if($tw.utils.hop(this.changeCount,title)) {
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this.changeCount[title]++;
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} else {
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this.changeCount[title] = 1;
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}
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// Trigger events
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this.eventListeners = this.eventListeners || [];
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if(!this.eventsTriggered) {
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var self = this;
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$tw.utils.nextTick(function() {
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var changes = self.changedTiddlers;
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self.changedTiddlers = {};
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self.eventsTriggered = false;
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self.dispatchEvent("change",changes);
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});
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this.eventsTriggered = true;
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}
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};
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exports.getChangeCount = function(title) {
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this.changeCount = this.changeCount || {};
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if($tw.utils.hop(this.changeCount,title)) {
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return this.changeCount[title];
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} else {
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return 0;
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}
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};
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exports.deleteTiddler = function(title) {
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delete this.tiddlers[title];
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this.clearCache(title);
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this.enqueueTiddlerEvent(title,true);
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};
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exports.tiddlerExists = function(title) {
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return !!this.tiddlers[title];
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};
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exports.addTiddler = function(tiddler) {
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// Check if we're passed a fields hashmap instead of a tiddler
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if(!(tiddler instanceof $tw.Tiddler)) {
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tiddler = new $tw.Tiddler(tiddler);
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}
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// Get the title
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var title = tiddler.fields.title;
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// Save the tiddler
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this.tiddlers[title] = tiddler;
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this.clearCache(title);
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this.enqueueTiddlerEvent(title);
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};
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/*
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Return a sorted array of non-system tiddler titles, optionally filtered by a tag
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*/
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exports.getTiddlers = function(sortField,excludeTag) {
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sortField = sortField || "title";
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var tiddlers = [], t, titles = [];
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for(t in this.tiddlers) {
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if($tw.utils.hop(this.tiddlers,t) && !this.tiddlers[t].isSystem() && (!excludeTag || !this.tiddlers[t].hasTag(excludeTag))) {
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tiddlers.push(this.tiddlers[t]);
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}
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}
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tiddlers.sort(function(a,b) {
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var aa = a.fields[sortField].toLowerCase() || "",
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bb = b.fields[sortField].toLowerCase() || "";
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if(aa < bb) {
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return -1;
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} else {
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if(aa > bb) {
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return 1;
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} else {
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return 0;
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}
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}
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});
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for(t=0; t<tiddlers.length; t++) {
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titles.push(tiddlers[t].fields.title);
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}
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return titles;
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};
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exports.countTiddlers = function(excludeTag) {
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var tiddlers = this.getTiddlers(null,excludeTag);
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return $tw.utils.count(tiddlers);
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};
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/*
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Sort an array of tiddler titles by a specified field
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titles: array of titles (sorted in place)
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sortField: name of field to sort by
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isDescending: true if the sort should be descending
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isCaseSensitive: true if the sort should consider upper and lower case letters to be different
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*/
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exports.sortTiddlers = function(titles,sortField,isDescending,isCaseSensitive) {
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var self = this;
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titles.sort(function(a,b) {
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if(sortField !== "title") {
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a = self.getTiddler(a).fields[sortField] || "";
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b = self.getTiddler(b).fields[sortField] || "";
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}
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if(!isCaseSensitive) {
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if(typeof a === "string") {
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a = a.toLowerCase();
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}
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if(typeof b === "string") {
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b = b.toLowerCase();
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}
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}
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if(a < b) {
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return isDescending ? +1 : -1;
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} else {
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if(a > b) {
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return isDescending ? -1 : +1;
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} else {
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return 0;
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}
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}
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});
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};
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exports.forEachTiddler = function(/* [sortField,[excludeTag,]]callback */) {
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var arg = 0,
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sortField = arguments.length > 1 ? arguments[arg++] : null,
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excludeTag = arguments.length > 2 ? arguments[arg++] : null,
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callback = arguments[arg++],
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titles = this.getTiddlers(sortField,excludeTag),
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t, tiddler;
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for(t=0; t<titles.length; t++) {
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tiddler = this.tiddlers[titles[t]];
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if(tiddler) {
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callback.call(this,tiddler.fields.title,tiddler);
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}
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}
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};
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/*
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Return an array of tiddler titles that are directly linked from the specified tiddler
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*/
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exports.getTiddlerLinks = function(title) {
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var self = this;
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// We'll cache the links so they only get computed if the tiddler changes
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return this.getCacheForTiddler(title,"links",function() {
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// Parse the tiddler
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var parser = self.parseTiddler(title);
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// Count up the links
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var links = [],
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checkParseTree = function(parseTree) {
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for(var t=0; t<parseTree.length; t++) {
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var parseTreeNode = parseTree[t];
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if(parseTreeNode.type === "element" && parseTreeNode.tag === "$link" && parseTreeNode.attributes.to.type === "string") {
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var value = parseTreeNode.attributes.to.value;
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if(links.indexOf(value) === -1) {
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links.push(value);
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}
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}
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if(parseTreeNode.children) {
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checkParseTree(parseTreeNode.children);
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}
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}
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};
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if(parser) {
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checkParseTree(parser.tree);
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}
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return links;
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});
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};
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/*
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Return an array of tiddler titles that link to the specified tiddler
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*/
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exports.getTiddlerBacklinks = function(targetTitle) {
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var self = this,
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backlinks = [];
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this.forEachTiddler(function(title,tiddler) {
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var links = self.getTiddlerLinks(title);
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if(links.indexOf(targetTitle) !== -1) {
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backlinks.push(title);
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}
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});
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return backlinks;
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};
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/*
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Return a hashmap of tiddler titles that are referenced but not defined. Each value is the number of times the missing tiddler is referenced
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*/
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exports.getMissingTitles = function() {
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var self = this,
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missing = [];
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// We should cache the missing tiddler list, even if we recreate it every time any tiddler is modified
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this.forEachTiddler(function(title,tiddler) {
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var links = self.getTiddlerLinks(title);
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$tw.utils.each(links,function(link) {
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if(!self.tiddlerExists(link) && missing.indexOf(link) === -1) {
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missing.push(link);
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}
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});
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});
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return missing;
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};
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exports.getOrphanTitles = function() {
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var self = this,
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orphans = this.getTiddlers();
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this.forEachTiddler(function(title,tiddler) {
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var links = self.getTiddlerLinks(title);
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$tw.utils.each(links,function(link) {
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var p = orphans.indexOf(link);
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if(p !== -1) {
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orphans.splice(p,1);
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}
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});
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});
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return orphans; // Todo
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};
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exports.getSystemTitles = function() {
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var titles = [];
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for(var title in this.tiddlers) {
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if(this.tiddlers[title].isSystem()) {
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titles.push(title);
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}
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}
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titles.sort();
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return titles;
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};
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/*
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Retrieves a list of the tiddler titles that are tagged with a given tag
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*/
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exports.getTiddlersWithTag = function(tag) {
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var titles = [];
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for(var title in this.tiddlers) {
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var tiddler = this.tiddlers[title];
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if(tiddler.fields.tags && tiddler.fields.tags.indexOf(tag) !== -1) {
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titles.push(title);
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}
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}
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return titles;
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};
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/*
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Get a tiddlers content as a JavaScript object. How this is done depends on the type of the tiddler:
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application/json: the tiddler JSON is parsed into an object
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application/x-tiddler-dictionary: the tiddler is parsed as sequence of name:value pairs
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Other types currently just return null.
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*/
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exports.getTiddlerData = function(title,defaultData) {
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var tiddler = this.getTiddler(title),
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data;
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if(tiddler && tiddler.fields.text) {
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switch(tiddler.fields.type) {
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case "application/json":
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// JSON tiddler
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try {
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data = JSON.parse(tiddler.fields.text);
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} catch(ex) {
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return defaultData;
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}
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return data;
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case "application/x-tiddler-dictionary":
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return $tw.utils.parseFields(tiddler.fields.text);
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}
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}
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return defaultData;
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};
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/*
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Extract an indexed field from within a data tiddler
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*/
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exports.extractTiddlerDataItem = function(title,index,defaultText) {
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var data = this.getTiddlerData(title,{}),
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text;
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if(data && $tw.utils.hop(data,index)) {
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text = data[index];
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}
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if(typeof text === "string" || typeof text === "number") {
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return text.toString();
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} else {
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return defaultText;
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}
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};
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/*
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Set a tiddlers content to a JavaScript object. Currently this is done by setting the tiddler's type to "application/json" and setting the text to the JSON text of the data.
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*/
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exports.setTiddlerData = function(title,data) {
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var tiddler = this.getTiddler(title);
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this.addTiddler(new $tw.Tiddler(tiddler,{title: title, type: "application/json", text: JSON.stringify(data,null,$tw.config.preferences.jsonSpaces)}));
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};
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/*
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Return the content of a tiddler as an array containing each line
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*/
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exports.getTiddlerList = function(title) {
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var tiddler = this.getTiddler(title);
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if(tiddler && tiddler.fields.text && tiddler.fields.text.length > 0) {
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return tiddler.fields.text.split("\n");
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}
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return [];
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};
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// Return the named cache object for a tiddler. If the cache doesn't exist then the initializer function is invoked to create it
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exports.getCacheForTiddler = function(title,cacheName,initializer) {
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this.caches = this.caches || {};
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var caches = this.caches[title];
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if(caches && caches[cacheName]) {
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return caches[cacheName];
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} else {
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if(!caches) {
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caches = {};
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this.caches[title] = caches;
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}
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caches[cacheName] = initializer();
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return caches[cacheName];
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}
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};
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// Clear all caches associated with a particular tiddler
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exports.clearCache = function(title) {
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this.caches = this.caches || {};
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if($tw.utils.hop(this.caches,title)) {
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delete this.caches[title];
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}
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};
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exports.initParsers = function(moduleType) {
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// Install the new parser modules
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$tw.wiki.parsers = {};
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var self = this;
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$tw.modules.forEachModuleOfType("parser",function(title,module) {
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for(var f in module) {
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if($tw.utils.hop(module,f)) {
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$tw.wiki.parsers[f] = module[f]; // Store the parser class
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}
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}
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});
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};
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/*
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Parse a block of text of a specified MIME type
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type: content type of text to be parsed
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text: text
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options: see below
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Options include:
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parseAsInline: if true, the text of the tiddler will be parsed as an inline run
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*/
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exports.parseText = function(type,text,options) {
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options = options || {};
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// Select a parser
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var Parser = this.parsers[type];
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if(!Parser && $tw.config.fileExtensionInfo[type]) {
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Parser = this.parsers[$tw.config.fileExtensionInfo[type].type];
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}
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if(!Parser) {
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Parser = this.parsers[options.defaultType || "text/vnd.tiddlywiki"];
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}
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if(!Parser) {
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return null;
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}
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// Return the parser instance
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return new Parser(type,text,{
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parseAsInline: options.parseAsInline,
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wiki: this
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});
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};
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/*
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Parse a tiddler according to its MIME type
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*/
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exports.parseTiddler = function(title,options) {
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options = options || {};
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var cacheType = options.parseAsInline ? "newInlineParseTree" : "newBlockParseTree",
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tiddler = this.getTiddler(title),
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self = this;
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return tiddler ? this.getCacheForTiddler(title,cacheType,function() {
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return self.parseText(tiddler.fields.type,tiddler.fields.text,options);
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}) : null;
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};
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/*
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Parse text in a specified format and render it into another format
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outputType: content type for the output
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textType: content type of the input text
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text: input text
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*/
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exports.renderText = function(outputType,textType,text) {
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var parser = this.parseText(textType,text),
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renderTree = new $tw.WikiRenderTree(parser,{wiki: this});
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renderTree.execute();
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return renderTree.render(outputType);
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};
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/*
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Parse text from a tiddler and render it into another format
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outputType: content type for the output
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title: title of the tiddler to be rendered
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*/
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exports.renderTiddler = function(outputType,title,renderContext) {
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var parser = this.parseTiddler(title),
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renderTree = new $tw.WikiRenderTree(parser,{wiki: this});
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renderTree.execute(renderContext);
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return renderTree.render(outputType);
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};
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/*
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Select the appropriate saver modules and set them up
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*/
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exports.initSavers = function(moduleType) {
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moduleType = moduleType || "saver";
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// Instantiate the available savers
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this.savers = [];
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var self = this;
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$tw.modules.forEachModuleOfType(moduleType,function(title,module) {
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if(module.canSave(self)) {
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self.savers.push(module.create(self));
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}
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});
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// Sort the savers into priority order
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this.savers.sort(function(a,b) {
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if(a.info.priority < b.info.priority) {
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return -1;
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} else {
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if(a.info.priority > b.info.priority) {
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return +1;
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} else {
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return 0;
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}
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}
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});
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};
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/*
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Invoke the highest priority saver that successfully handles a method
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*/
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exports.callSaver = function(method /*, args */ ) {
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for(var t=this.savers.length-1; t>=0; t--) {
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var saver = this.savers[t];
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if(saver[method].apply(saver,Array.prototype.slice.call(arguments,1))) {
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return true;
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}
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}
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return false;
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};
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/*
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Save the wiki contents. Options are:
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template: the tiddler containing the template to save
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downloadType: the content type for the saved file
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*/
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exports.saveWiki = function(options) {
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options = options || {};
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var template = options.template || "$:/core/templates/tiddlywiki5.template.html",
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downloadType = options.downloadType || "text/plain";
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var text = this.renderTiddler(downloadType,template);
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this.callSaver("save",text);
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};
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/*
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Return an array of tiddler titles that match a search string
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|
text: The text string to search for
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options: see below
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|
Options available:
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titles: Hashmap or array of tiddler titles to limit search
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|
exclude: An array of tiddler titles to exclude from the search
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|
invert: If true returns tiddlers that do not contain the specified string
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caseSensitive: If true forces a case sensitive search
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|
literal: If true, searches for literal string, rather than separate search terms
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|
*/
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|
exports.search = function(text,options) {
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options = options || {};
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var self = this,t;
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// Convert the search string into a regexp for each term
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|
var terms, searchTermsRegExps,
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|
flags = options.caseSensitive ? "" : "i";
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if(options.literal) {
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|
if(text.length === 0) {
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return [];
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|
}
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|
searchTermsRegExps = [new RegExp("(" + $tw.utils.escapeRegExp(text) + ")",flags)];
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} else {
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|
terms = text.replace(/( +)/g," ").split(" ");
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|
searchTermsRegExps = [];
|
|
if(terms.length === 0) {
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|
return [];
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|
}
|
|
for(t=0; t<terms.length; t++) {
|
|
searchTermsRegExps.push(new RegExp("(" + $tw.utils.escapeRegExp(terms[t]) + ")",flags));
|
|
}
|
|
}
|
|
// Function to check a given tiddler for the search term
|
|
var searchTiddler = function(title) {
|
|
var tiddler = self.getTiddler(title);
|
|
if(!tiddler) {
|
|
return !!options.invert;
|
|
}
|
|
var contentTypeInfo = $tw.config.contentTypeInfo[tiddler.fields.type];
|
|
if(contentTypeInfo ? contentTypeInfo.encoding === "utf8" : true) {
|
|
var match = true;
|
|
for(var t=0; t<searchTermsRegExps.length; t++) {
|
|
// Search title and body
|
|
if(match) {
|
|
match = searchTermsRegExps[t].test(tiddler.fields.title) || searchTermsRegExps[t].test(tiddler.fields.text);
|
|
}
|
|
}
|
|
return options.invert ? !match : match;
|
|
}
|
|
return false;
|
|
};
|
|
// Loop through all the tiddlers doing the search
|
|
var results = [];
|
|
if($tw.utils.isArray(options.titles)) {
|
|
for(t=0; t<options.titles.length; t++) {
|
|
if(searchTiddler(options.titles[t])) {
|
|
results.push(options.titles[t]);
|
|
}
|
|
}
|
|
} else {
|
|
var source = options.titles || this.tiddlers;
|
|
for(t in source) {
|
|
if(searchTiddler(t)) {
|
|
results.push(t);
|
|
}
|
|
}
|
|
}
|
|
// Remove any of the results we have to exclude
|
|
if(options.exclude) {
|
|
for(t=0; t<options.exclude.length; t++) {
|
|
var p = results.indexOf(options.exclude[t]);
|
|
if(p !== -1) {
|
|
results.splice(p,1);
|
|
}
|
|
}
|
|
}
|
|
return results;
|
|
};
|
|
|
|
/*
|
|
Trigger a load for a tiddler if it is skinny. Returns the text, or undefined if the tiddler is missing, null if the tiddler is being lazily loaded.
|
|
*/
|
|
exports.getTiddlerText = function(title,defaultText) {
|
|
var tiddler = this.getTiddler(title);
|
|
// Return undefined if the tiddler isn't found
|
|
if(!tiddler) {
|
|
return defaultText;
|
|
}
|
|
if(tiddler.fields.text !== undefined) {
|
|
// Just return the text if we've got it
|
|
return tiddler.fields.text;
|
|
} else {
|
|
// Tell any listeners about the need to lazily load this tiddler
|
|
this.dispatchEvent("lazyLoad",title);
|
|
// Indicate that the text is being loaded
|
|
return null;
|
|
}
|
|
};
|
|
|
|
})();
|