443 lines
14 KiB
JavaScript
Executable File
443 lines
14 KiB
JavaScript
Executable File
/*\
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title: js/Recipe.js
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Recipe processing is in four parts:
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1) The recipe file is parsed and any subrecipe files loaded recursively into this structure:
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this.recipe = [
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{marker: <marker>, filepath: <filepath>, contextPath: <contextPath>},
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...
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{marker: <marker>, filepath: <filepath>, contextPath: <contextPath>},
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[
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{marker: <marker>, filepath: <filepath>, contextPath: <contextPath>},
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...
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{marker: <marker>, filepath: <filepath>, contextPath: <contextPath>},
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]
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];
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2) The tiddler files referenced by the recipe structure are loaded into it as an additional 'tiddlers'
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member that contains an array of hashmaps of tiddler field values.
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3) The recipe is scanned to create a hashmap of markers and their associated tiddlers. In cases where more
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than one tiddler with the same title is assigned to a marker, the one that is later in the recipe file wins.
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At this point tiddlers are placed in the store so that they can be referenced by title
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this.markers = {
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<marker>: [<tiddler title>,<tiddler title>,...],
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<marker>: [<tiddler title>,<tiddler title>,...],
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...
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}
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4) Finally, to actually cook the recipe, the template is processed by replacing the markers with the text of the associated tiddlers
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\*/
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(function(){
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/*jslint node: true */
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"use strict";
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var Tiddler = require("./Tiddler.js").Tiddler,
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utils = require("./Utils.js"),
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retrieveFile = require("./FileRetriever.js").retrieveFile,
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fs = require("fs"),
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path = require("path"),
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util = require("util"),
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async = require("async");
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/*
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Load a recipe file. Arguments are:
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options: See below
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callback: Function to be called when the recipe has been loaded as callback(err), null === success
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Options include:
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filepath: The filepath of the recipe file to load. Can be a local path or an HTTP URL
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store: Indicates the WikiStore to use to store the tiddlers (mandatory)
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*/
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var Recipe = function(options,callback) {
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var me = this;
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this.filepath = options.filepath;
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this.store = options.store;
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this.callback = callback;
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this.recipe = [];
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this.markers = {};
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// A task queue for loading recipe files
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this.recipeQueue = async.queue(function(task,callback) {
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retrieveFile(task.filepath,task.contextPath,function(err,data) {
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if(err) {
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me.callback(err);
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} else {
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me.processRecipeFile(task.recipe,data.text,data.path);
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callback(null);
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}
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});
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},1);
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// A task queue for loading tiddler files
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this.tiddlerQueue = async.queue(function(task,callback) {
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me.readTiddlerFile(task.filepath,task.contextPath,function(err,data) {
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if(err) {
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callback(err);
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} else {
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if(task.recipeLine.fields) {
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for(var t=0; t<data.length; t++) {
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for(var f in task.recipeLine.fields) {
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data[t][f] = task.recipeLine.fields[f];
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}
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}
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}
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if(!task.recipeLine.tiddlers) {
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task.recipeLine.tiddlers = [];
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}
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Array.prototype.push.apply(task.recipeLine.tiddlers,data);
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callback(null);
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}
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});
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},1);
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// Called when all the recipes have been loaded
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this.recipeQueue.drain = function() {
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// Initiate the loading of the tiddlers referenced by the recipe
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for(var r=0; r<me.recipe.length; r++) {
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me.loadTiddlerFiles(me.recipe[r]);
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}
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};
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// Called when all the tiddlers have been loaded
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this.tiddlerQueue.drain = function() {
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// Select the tiddlers that are associated with each marker
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me.chooseTiddlers(me.recipe);
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// Sort the main content tiddlers (makes it easier to diff TiddlyWiki files)
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me.sortTiddlersForMarker("tiddler");
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me.callback(null);
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};
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// Start the process off by queueing up the loading of the initial recipe
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this.recipeQueue.push({filepath: this.filepath,
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contextPath: process.cwd(),
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recipe: this.recipe});
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};
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/*
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Recursively queue loading the tiddler files referenced by a recipe line
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*/
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Recipe.prototype.loadTiddlerFiles = function(recipeLine) {
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var me = this;
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if(recipeLine instanceof Array) {
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for(var r=0; r<recipeLine.length; r++) {
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me.loadTiddlerFiles(recipeLine[r]);
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}
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} else {
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var filepath = recipeLine.filepath, // eg ../js/*.js
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filedir = path.dirname(filepath), // eg ../js
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filename = path.basename(filepath), // eg *.js
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posStar = filename.indexOf("*");
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if(posStar !== -1) {
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var fileRegExp = new RegExp("^" + filename.replace(/[\-\[\]{}()+?.,\\\^$|#\s]/g, "\\$&").replace("*",".*") + "$");
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var files = fs.readdirSync(path.resolve(path.dirname(recipeLine.contextPath),filedir));
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for(var f=0; f<files.length; f++) {
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if(fileRegExp.test(files[f])) {
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me.tiddlerQueue.push({
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filepath: filedir + "/" + files[f],
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contextPath: recipeLine.contextPath,
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recipeLine: recipeLine
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});
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}
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}
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} else {
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me.tiddlerQueue.push({filepath: filepath, contextPath: recipeLine.contextPath, recipeLine: recipeLine});
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}
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}
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};
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/*
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Choose the tiddlers to be included on each marker
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*/
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Recipe.prototype.chooseTiddlers = function(recipe) {
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// Loop through the lines of the recipe
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for(var r=0; r<recipe.length; r++) {
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var recipeLine = recipe[r];
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if(recipeLine instanceof Array) {
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// Process subrecipes recursively
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this.chooseTiddlers(recipeLine);
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} else {
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// Choose the store and marker array to be used for this marker
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var store = recipeLine.marker === "shadow" ? this.store.shadows : this.store,
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markerArray = this.markers[recipeLine.marker];
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// Create the marker array if necessary
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if(markerArray === undefined) {
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this.markers[recipeLine.marker] = [];
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markerArray = this.markers[recipeLine.marker];
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}
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// Process each of the tiddlers referenced by the recipe line
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for(var t=0; t<recipeLine.tiddlers.length; t++) {
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// Only add the tiddler to the marker if it isn't already there
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var found = false;
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for(var m=0; m<markerArray.length; m++) {
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if(markerArray[m] === recipeLine.tiddlers[t].title) {
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found = true;
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}
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}
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if(!found) {
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markerArray.push(recipeLine.tiddlers[t].title);
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}
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// Add the tiddler to the store
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store.addTiddler(new Tiddler(recipeLine.tiddlers[t]));
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}
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}
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}
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};
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/*
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Sort the tiddlers associated with a particular marker
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*/
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Recipe.prototype.sortTiddlersForMarker = function(marker) {
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if(this.markers[marker]) {
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this.markers[marker].sort();
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}
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};
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/*
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Process the contents of a recipe file
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*/
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Recipe.prototype.processRecipeFile = function(recipe,text,contextPath) {
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var matchLine = function(linetext) {
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var lineRegExp = /^(#?)(\s*)(#?)([^\s\:]+)\s*:\s*(.+)*\s*$/,
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match = lineRegExp.exec(linetext);
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return match ? {
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comment: match[1] || match[3],
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indent: match[2],
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marker: match[4],
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value: match[5]
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} : null;
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},
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lines = text.split("\n"),
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line = 0;
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while(line < lines.length) {
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var linetext = lines[line++],
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match = matchLine(linetext);
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if(match && !match.comment) {
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if(match.indent.length > 0) {
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throw "Unexpected indentation in recipe file";
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}
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if(match.marker === "recipe") {
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var insertionPoint = recipe.push([]) - 1;
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this.recipeQueue.push({
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filepath: match.value,
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contextPath: contextPath,
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recipe: recipe[insertionPoint]
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});
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} else {
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var fieldLines = [],
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fieldMatch = matchLine(lines[line]);
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while(fieldMatch && fieldMatch.indent.length > 0) {
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fieldLines.push(lines[line++]);
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fieldMatch = matchLine(lines[line]);
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}
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var fields = {};
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if(fieldLines.length > 0) {
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fields = this.store.deserializeTiddlers("application/x-tiddler",fieldLines.join("\n"),{})[0];
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}
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recipe.push({marker: match.marker, filepath: match.value, contextPath: contextPath, fields: fields});
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}
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}
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}
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};
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// Read a tiddler file and callback with an array of hashmaps of tiddler fields. For single
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// tiddler files it also looks for an accompanying .meta file
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Recipe.prototype.readTiddlerFile = function(filepath,contextPath,callback) {
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var me = this;
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// Read the tiddler file
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retrieveFile(filepath,contextPath,function(err,data) {
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if (err) throw err;
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// Use the filepath as the default title for the tiddler
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var fields = {
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title: data.path
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};
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var tiddlers = me.store.deserializeTiddlers(data.extname,data.text,fields);
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// Check for the .meta file
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if(data.extname !== ".json" && tiddlers.length === 1) {
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var metafile = filepath + ".meta";
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retrieveFile(metafile,contextPath,function(err,data) {
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if(err && err.code !== "ENOENT" && err.code !== "404") {
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callback(err);
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} else {
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var fields = tiddlers[0];
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if(!err) {
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var text = data.text.split("\n\n")[0];
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if(text) {
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fields = me.store.deserializeTiddlers("application/x-tiddler",text,fields)[0];
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}
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}
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callback(null,[fields]);
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}
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});
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} else {
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callback(null,tiddlers);
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}
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});
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};
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// Return a string of the cooked recipe
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Recipe.prototype.cook = function() {
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var template = this.markers.template ? this.store.getTiddlerText(this.markers.template[0]) : "",
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out = [],
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me = this;
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template.split("\n").forEach(function(line) {
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var templateRegExp = /^(?:<!--@@(.*)@@-->)|(?:<!--@@(.*)@@-->)$/gi;
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var match = templateRegExp.exec(line);
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if(match) {
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var marker = match[1] === undefined ? match[2] : match[1];
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me.outputTiddlersForMarker(out,marker);
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} else {
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out.push(line);
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}
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});
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return out.join("\n");
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};
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// Output all the tiddlers in the recipe with a particular marker
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Recipe.prototype.outputTiddlersForMarker = function(out,marker) {
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var tiddlers = this.markers[marker],
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outputType = Recipe.tiddlerOutputMapper[marker] || "raw",
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outputter = Recipe.tiddlerOutputter[outputType];
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if(!tiddlers) {
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tiddlers = [];
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}
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if(outputter) {
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outputter.call(this,out,tiddlers);
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}
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};
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// Allows for specialised processing for certain markers
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Recipe.tiddlerOutputMapper = {
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tiddler: "div",
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js: "javascript",
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jsdeprecated: "javascript",
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jquery: "javascript",
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shadow: "shadow",
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title: "title",
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jsmodule: "jsmodule"
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};
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Recipe.tiddlerOutputter = {
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raw: function(out,tiddlers) {
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// The default is just to output the raw text of the tiddler, ignoring any metadata
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for(var t=0; t<tiddlers.length; t++) {
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// For compatibility with cook.rb, remove one trailing \n from tiddler
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var text = this.store.getTiddlerText(tiddlers[t]);
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text = text.charAt(text.length-1) === "\n" ? text.substr(0,text.length-1) : text;
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out.push(text);
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}
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},
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div: function(out,tiddlers) {
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// Ordinary tiddlers are output as a <DIV>
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for(var t=0; t<tiddlers.length; t++) {
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var tid = this.store.getTiddler(tiddlers[t]);
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out.push(this.store.serializeTiddler("application/x-tiddler-html-div",tid));
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}
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},
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javascript: function(out,tiddlers) {
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// Lines starting with //# are removed from javascript tiddlers
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for(var t=0; t<tiddlers.length; t++) {
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var tid = this.store.getTiddler(tiddlers[t]),
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text = tid.text;
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// For compatibility with cook.rb, remove one trailing \n from tiddler
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text = text.charAt(text.length-1) === "\n" ? text.substr(0,text.length-1) : text;
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var lines = text.split("\n");
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for(var line=0; line<lines.length; line++) {
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var commentRegExp = /^\s*\/\/#/gi;
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if(!commentRegExp.test(lines[line])) {
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out.push(lines[line]);
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}
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}
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}
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},
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shadow: function(out,tiddlers) {
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for(var t=0; t<tiddlers.length; t++) {
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var title = tiddlers[t],
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tid = this.store.shadows.getTiddler(title);
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out.push(this.store.serializeTiddler("application/x-tiddler-html-div",tid));
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}
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},
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title: function(out,tiddlers) {
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out.push(this.store.renderTiddler("text/plain","WindowTitle"));
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},
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jsmodule: function(out,tiddlers) {
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// JavaScript modules are output as a special script tag
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for(var t=0; t<tiddlers.length; t++) {
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var title = tiddlers[t],
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tid = this.store.getTiddler(title);
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out.push("<" + "script type=\"application/javascript\">");
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out.push("define(\"" + title + "\",function(require,exports,module) {");
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out.push(tid.text);
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out.push("});");
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out.push("</" + "script>");
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}
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}
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};
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// Cook an RSS file of the most recent 20 tiddlers
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Recipe.prototype.cookRss = function() {
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var me = this,
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numRssItems = 20,
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s = [],
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d = new Date(),
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u = this.store.renderTiddler("text/plain","SiteUrl"),
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encodeTiddlyLink = function(title) {
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return title.indexOf(" ") == -1 ? title : "[[" + title + "]]";
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},
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tiddlerToRssItem = function(tiddler,uri) {
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var s = "<title" + ">" + utils.htmlEncode(tiddler.title) + "</title" + ">\n";
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s += "<description>" + utils.htmlEncode(me.store.renderTiddler("text/html",tiddler.title)) + "</description>\n";
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var i;
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if(tiddler.tags) {
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for(i=0; i<tiddler.tags.length; i++) {
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s += "<category>" + tiddler.tags[i] + "</category>\n";
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}
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}
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s += "<link>" + uri + "#" + encodeURIComponent(encodeTiddlyLink(tiddler.title)) + "</link>\n";
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if(tiddler.modified) {
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s +="<pubDate>" + tiddler.modified.toUTCString() + "</pubDate>\n";
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}
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return s;
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},
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getRssTiddlers = function(sortField,excludeTag) {
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var r = [];
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me.store.forEachTiddler(sortField,excludeTag,function(title,tiddler) {
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if(!tiddler.hasTag(excludeTag) && tiddler.modified !== undefined) {
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r.push(tiddler);
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}
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});
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return r;
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};
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// Assemble the header
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s.push("<" + "?xml version=\"1.0\"?" + ">");
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s.push("<rss version=\"2.0\">");
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s.push("<channel>");
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s.push("<title" + ">" + utils.htmlEncode(this.store.renderTiddler("text/plain","SiteTitle")) + "</title" + ">");
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if(u)
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s.push("<link>" + utils.htmlEncode(u) + "</link>");
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s.push("<description>" + utils.htmlEncode(this.store.renderTiddler("text/plain","SiteSubtitle")) + "</description>");
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//s.push("<language>" + config.locale + "</language>");
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s.push("<pubDate>" + d.toUTCString() + "</pubDate>");
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s.push("<lastBuildDate>" + d.toUTCString() + "</lastBuildDate>");
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s.push("<docs>http://blogs.law.harvard.edu/tech/rss</docs>");
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s.push("<generator>https://github.com/Jermolene/cook.js</generator>");
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// The body
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var tiddlers = getRssTiddlers("modified","excludeLists");
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var i,n = numRssItems > tiddlers.length ? 0 : tiddlers.length-numRssItems;
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for(i=tiddlers.length-1; i>=n; i--) {
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s.push("<item>\n" + tiddlerToRssItem(tiddlers[i],u) + "\n</item>");
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}
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// And footer
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s.push("</channel>");
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s.push("</rss>");
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// Save it all
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return s.join("\n");
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};
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exports.Recipe = Recipe;
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})();
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