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Merge pull request #11 from teem2/plugins
Adding plugin support to dreem2
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,162 @@ | ||
| /* | ||
| The MIT License (see LICENSE) | ||
| Copyright (C) 2014-2015 Teem2 LLC | ||
| */ | ||
| /** | ||
| * @class PluginLoader {Internal} | ||
| * Reads plugins and injects them into compositins when requested. | ||
| */ | ||
| define(function(require, exports, module) { | ||
| module.exports = PluginLoader; | ||
|
|
||
| var path = require('path'), | ||
| fs = require('fs'), | ||
|
|
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| HTMLParser = require('./htmlparser'), | ||
| DreemError = require('./dreemerror'); | ||
|
|
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| function PluginLoader(args, teemserver) { | ||
| this.teemServer = teemserver; | ||
| this.args = args; | ||
| this.plugins = {}; | ||
|
|
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| this.__findPlugins(); | ||
| } | ||
|
|
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| body.call(PluginLoader.prototype); | ||
|
|
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| function body() { | ||
|
|
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| this.__findPlugins = function() { | ||
| var pluginDirs = this.args['-plugin']; | ||
| if (!pluginDirs) { | ||
| pluginDirs = [] | ||
| } | ||
| if (!Array.isArray(pluginDirs)) { | ||
| pluginDirs = [pluginDirs] | ||
| } | ||
|
|
||
| var errors = []; | ||
| for (var i=0;i<pluginDirs.length;i++) { | ||
| var pdir = pluginDirs[i]; | ||
| if (pdir) { | ||
| var dir = path.resolve(pdir); | ||
| if (fs.existsSync(dir + '/index.dre')) { | ||
| if (!define['PLUGIN']) { | ||
| define['PLUGIN'] = []; | ||
| } | ||
| define['PLUGIN'].push(dir + '/node_modules/'); | ||
| this.__loadPlugin(dir, errors); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| this.extractedObjects = this.__extractObjects(this.plugins); | ||
| }; | ||
|
|
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| this.inject = function (composition) { | ||
| var objects = composition.child; | ||
| if (objects) { | ||
| for (var i=this.extractedObjects.length - 1;i >=0;i--) { | ||
| var obj = this.extractedObjects[i]; | ||
|
|
||
| var matchingTag = undefined; | ||
| for (var j=0;j<objects.length;j++) { | ||
| if (objects[j].tag == obj.tag) { | ||
| matchingTag = objects[j]; | ||
| break; | ||
| } | ||
| } | ||
|
|
||
| if (matchingTag) { | ||
| var children = matchingTag.child; | ||
| if (!children) { | ||
| children = matchingTag.child = []; | ||
| } | ||
| var toCopy = obj.child; | ||
| for (j=0;j<toCopy.length;j++) { | ||
| children.unshift(toCopy[j]); | ||
| } | ||
| } else { | ||
| objects.unshift(obj); | ||
| } | ||
| } | ||
| } | ||
| }; | ||
|
|
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| this.__extractObjects = function (plugins) { | ||
|
|
||
| var objects = []; | ||
| for (var n in plugins) { | ||
| var plugin = plugins[n]; | ||
| var root = plugin.child; | ||
| if (root && root.length > 0) { | ||
| var children = root[0].child; | ||
| for (var j=0;j<children.length;j++) { | ||
| objects.push(children[j]) | ||
| } | ||
| } | ||
| } | ||
| return objects; | ||
| }; | ||
|
|
||
| this.__originate = function (obj, name) { | ||
| if (obj.tag) { | ||
| obj['origin'] = name; | ||
| } | ||
| if (obj.child) { | ||
| for (var i = 0;i<obj.child.length;i++) { | ||
| var child = obj.child[i]; | ||
| this.__originate(child, name); | ||
| } | ||
| } | ||
| }; | ||
|
|
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| this.__loadPlugin = function (dir, errors) { | ||
| console.log('Found plugin in dir:', dir); | ||
|
|
||
| try { | ||
| var drefile = dir + '/index.dre'; | ||
| var data = fs.readFileSync(drefile); | ||
|
|
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| var htmlParser = new HTMLParser(); | ||
| var source = data.toString(); | ||
| var plugin = htmlParser.parse(source); | ||
| plugin.rootDir = dir; | ||
|
|
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| // forward the parser errors | ||
| if (htmlParser.errors.length) { | ||
| htmlParser.errors.map(function(e) { | ||
| errors.push(new DreemError("HTML Parser Error: " + e.message, e.where)); | ||
| }); | ||
| } | ||
|
|
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| plugin.source = source; | ||
|
|
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| if (fs.existsSync(dir + '/package.json')) { | ||
| plugin.pkg = require(dir + '/package.json'); | ||
| } | ||
| if (!plugin.pkg) { | ||
| plugin.pkg = {} | ||
| } | ||
| if (!plugin.pkg.name) { | ||
| //if no package grab the last directory and use it as the plugin name | ||
| var match = /([^\/])+\/?$/.exec(dir); | ||
| if (match.length) { | ||
| plugin.pkg.name = match[0]; | ||
| } | ||
| } | ||
|
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| this.__originate(plugin, plugin.pkg.name); | ||
|
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| this.plugins[plugin.pkg.name] = plugin; | ||
|
|
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| } catch(e) { | ||
| errors.push(new DreemError("Error during readFileSync in __loadPlugin: " + e.toString())); | ||
| } | ||
|
|
||
| }; | ||
|
|
||
| } | ||
|
|
||
| }); |
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