/*\
title: $:/core/boot.js
type: application/javascript

The main boot kernel for TiddlyWiki. This single file creates a barebones TW environment that is just sufficient to bootstrap the modules containing the main logic of the application.

On the server this file is executed directly to boot TiddlyWiki. In the browser, this file is packed into a single HTML file along with other elements:

# bootprefix.js
# <module definitions>
# boot.js

The module definitions on the browser look like this:

	$tw.defineModule("MyModule","moduletype",function(module,exports,require) {
	// Module code inserted here
	return exports;
	});

In practice, each module is wrapped in a separate script block.

\*/
(function() {

/*jslint node: true, browser: true */
/*global modules: false, $tw: false */
"use strict";

/////////////////////////// Setting up $tw

// Set up $tw global for the server
if(typeof(window) === "undefined") {
	global.$tw = global.$tw || {}; // No `browser` member for the server
	exports.$tw = $tw; // Export $tw for when boot.js is required directly in node.js
}

// Include bootprefix if we're on the server
if(!$tw.browser) {
	require("./bootprefix.js");
}

// Boot information
$tw.boot = {};

// Plugin state
$tw.plugins = {};

// Modules store registers all the modules the system has seen
$tw.modules = $tw.modules || {};
$tw.modules.titles = $tw.modules.titles || {}; // hashmap by module title of {fn:, exports:, moduleType:}
$tw.modules.types = $tw.modules.types || {}; // hashmap by module type of hashmap of exports

// Config object
$tw.config = $tw.config || {};

// Constants
$tw.config.pluginsPath = "../plugins/";
$tw.config.wikiInfo = $tw.config.wikiInfo || "./tiddlywiki.info";
$tw.config.wikiPluginsSubDir = $tw.config.wikiPluginsSubDir || "./plugins";
$tw.config.wikiShadowsSubDir = $tw.config.wikiShadowsSubDir || "./wiki";
$tw.config.wikiTiddlersSubDir = $tw.config.wikiTiddlersSubDir || "./tiddlers";

$tw.config.jsModuleHeaderRegExpString = "^\\/\\*\\\\\\n((?:^[^\\n]*\\n)+?)(^\\\\\\*\\/$\\n?)";

// File extension mappings
$tw.config.fileExtensionInfo = {
	".tid": {type: "application/x-tiddler"},
	".tiddler": {type: "application/x-tiddler-html-div"},
	".recipe": {type: "application/x-tiddlywiki-recipe"},
	".txt": {type: "text/plain"},
	".css": {type: "text/css"},
	".html": {type: "text/html"},
	".js": {type: "application/javascript"},
	".json": {type: "application/json"},
	".pdf": {type: "application/pdf"},
	".jpg": {type: "image/jpeg"},
	".jpeg": {type: "image/jpeg"},
	".png": {type: "image/png"},
	".gif": {type: "image/gif"},
	".svg": {type: "image/svg+xml"}
};

// Content type mappings
$tw.config.contentTypeInfo = {
	"text/x-tiddlywiki": {encoding: "utf8", extension: ".tid"},
	"application/x-tiddler": {encoding: "utf8", extension: ".tid"},
	"application/x-tiddler-html-div": {encoding: "utf8", extension: ".tiddler"},
	"application/x-tiddlywiki-recipe": {encoding: "utf8", extension: ".recipe"},
	"text/plain": {encoding: "utf8", extension: ".txt"},
	"text/css": {encoding: "utf8", extension: ".css"},
	"text/html": {encoding: "utf8", extension: ".html"},
	"application/javascript": {encoding: "utf8", extension: ".js"},
	"application/json": {encoding: "utf8", extension: ".json"},
	"application/pdf": {encoding: "base64", extension: ".pdf"},
	"image/jpeg": {encoding: "base64", extension: ".jpg"},
	"image/png": {encoding: "base64", extension: ".png"},
	"image/gif": {encoding: "base64", extension: ".gif"},
	"image/svg+xml": {encoding: "utf8", extension: ".svg"}
};

/////////////////////////// Utility functions

$tw.utils = $tw.utils || {};

/*
Check if an object has a property
*/
$tw.utils.hop = function(object,property) {
	return Object.prototype.hasOwnProperty.call(object,property);
};

/*
Iterate through all the own properties of an object. Callback is invoked with (element,title,object)
*/
$tw.utils.each = function(object,callback) {
	if(object) {
		for(var f in object) {
			if($tw.utils.hop(object,f)) {
				callback(object[f],f,object);
			}
		}
	}
}

/*
Determine if a value is an array
*/
$tw.utils.isArray = function(value) {
	return Object.prototype.toString.call(value) == "[object Array]";
};

/*
Convert "&amp;" to &, "&lt;" to <, "&gt;" to > and "&quot;" to "
*/
$tw.utils.htmlDecode = function(s) {
	return s.toString().replace(/&lt;/mg,"<").replace(/&gt;/mg,">").replace(/&quot;/mg,"\"").replace(/&amp;/mg,"&");
};

/*
Pad a string to a given length with "0"s. Length defaults to 2
*/
$tw.utils.pad = function(value,length) {
	length = length || 2;
	var s = value.toString();
	if(s.length < length) {
		s = "000000000000000000000000000".substr(0,length - s.length) + s;
	}
	return s;
};

// Convert a date into YYYYMMDDHHMM format
$tw.utils.stringifyDate = function(value) {
	return value.getUTCFullYear() +
			$tw.utils.pad(value.getUTCMonth() + 1) +
			$tw.utils.pad(value.getUTCDate()) + 
			$tw.utils.pad(value.getUTCHours()) + 
			$tw.utils.pad(value.getUTCMinutes());
};

// Parse a date from a YYYYMMDDHHMMSSMMM format string
$tw.utils.parseDate = function(value) {
	if(typeof value === "string") {
		return new Date(Date.UTC(parseInt(value.substr(0,4),10),
				parseInt(value.substr(4,2),10)-1,
				parseInt(value.substr(6,2),10),
				parseInt(value.substr(8,2)||"00",10),
				parseInt(value.substr(10,2)||"00",10),
				parseInt(value.substr(12,2)||"00",10),
				parseInt(value.substr(14,3)||"000",10)));
	} else if (value instanceof Date) {
		return value;
	} else {
		return null;
	}
};

// Parse a string array from a bracketted list. For example "OneTiddler [[Another Tiddler]] LastOne"
$tw.utils.parseStringArray = function(value) {
	if(typeof value === "string") {
		var memberRegExp = /(?:\[\[([^\]]+)\]\])|([^\s]+)/mg,
			results = [],
			match;
		do {
			match = memberRegExp.exec(value);
			if(match) {
				results.push(match[1] || match[2]);
			}
		} while(match);
		return results;
	} else if ($tw.utils.isArray(value)) {
		return value;
	} else {
		return null;
	}
};

// Parse a block of name:value fields. The `fields` object is used as the basis for the return value
$tw.utils.parseFields = function(text,fields) {
	text.split(/\r?\n/mg).forEach(function(line) {
		var p = line.indexOf(":");
		if(p !== -1) {
			var field = line.substr(0, p).trim(),
				value = line.substr(p+1).trim();
			fields[field] = value;
		}
	});
	return fields;
};

/*
Resolves a source filepath delimited with `/` relative to a specified absolute root filepath.
In relative paths, the special folder name `..` refers to immediate parent directory, and the
name `.` refers to the current directory
*/
$tw.utils.resolvePath = function(sourcepath,rootpath) {
	// If the source path starts with ./ or ../ then it is relative to the root
	if(sourcepath.substr(0,2) === "./" || sourcepath.substr(0,3) === "../" ) {
		var src = sourcepath.split("/"),
			root = rootpath.split("/");
		// Remove the filename part of the root
		root.splice(root.length-1,1);
		// Process the source path bit by bit onto the end of the root path
		while(src.length > 0) {
			var c = src.shift();
			if(c === "..") { // Slice off the last root entry for a double dot
				if(root.length > 0) {
					root.splice(root.length-1,1);
				}
			} else if(c !== ".") { // Ignore dots
				root.push(c); // Copy other elements across
			}
		}
		return root.join("/");
	} else {
		// If it isn't relative, just return the path
		return sourcepath;
	}
};

/*
Returns true if the `actual` version is greater than or equal to the `required` version. Both are in `x.y.z` format.
*/
$tw.utils.checkVersions = function(required,actual) {
	var targetVersion = required.split("."),
		currVersion = actual.split("."),
		diff = [parseInt(targetVersion[0],10) - parseInt(currVersion[0],10),
				parseInt(targetVersion[1],10) - parseInt(currVersion[1],10),
				parseInt(targetVersion[2],10) - parseInt(currVersion[2],10)];
	return (diff[0] > 0) ||
		(diff[0] === 0 && diff[1] > 0) ||
		(diff[0] === 0 && diff[1] === 0 && diff[2] > 0);
};

/*
Creates a PasswordPrompt object
*/
$tw.utils.PasswordPrompt = function() {
	// Store of pending password prompts
	this.passwordPrompts = [];
	// Create the wrapper
	this.promptWrapper = document.createElement("div");
	this.promptWrapper.className = "tw-password-wrapper";
	document.body.appendChild(this.promptWrapper);
	// Hide the empty wrapper
	this.setWrapperDisplay();
};

/*
Hides or shows the wrapper depending on whether there are any outstanding prompts
*/
$tw.utils.PasswordPrompt.prototype.setWrapperDisplay = function() {
	if(this.passwordPrompts.length) {
		this.promptWrapper.style.display = "block";
	} else {
		this.promptWrapper.style.display = "none";
	}
};

/*
Adds a new password prompt
*/
$tw.utils.PasswordPrompt.prototype.createPrompt = function(options) {
	// Create and add the prompt to the DOM
	var submitText = options.submitText || "Login",
		form = document.createElement("form"),
		html = ["<h1>" + options.serviceName + "</h1>"];
	if(!options.noUserName) {
		html.push("<input type='text' name='username' class='input-small' placeholder='Username'>");
	}
	html.push("<input type='password' name='password' class='input-small' placeholder='Password'>",
			"<button type='submit' class='btn'>" + submitText + "</button>");
	form.className = "form-inline";
	form.innerHTML = html.join("\n");
	this.promptWrapper.appendChild(form);
	window.setTimeout(function() {
		form.elements[0].focus();
	},10);
	// Add a submit event handler
	var self = this;
	form.addEventListener("submit",function(event) {
		// Collect the form data
		var data = {},t;
		for(t=0; t<form.elements.length; t++) {
			var e = form.elements[t];
			if(e.name && e.value) {
				data[e.name] = e.value;
			}
		}
		// Call the callback
		if(options.callback(data)) {
			// Remove the prompt if the callback returned true
			var i = self.passwordPrompts.indexOf(promptInfo);
			if(i !== -1) {
				self.passwordPrompts.splice(i,1);
				promptInfo.form.parentNode.removeChild(promptInfo.form);
				self.setWrapperDisplay();
			}
		} else {
			// Clear the password if the callback returned false
			for(t=0; t<form.elements.length; t++) {
				var e = form.elements[t];
				if(e.name === "password") {
					form.elements[t].value = "";
				}
			}
		}
		event.preventDefault();
		return false;
	},true);
	// Add the prompt to the list
	var promptInfo = {
		serviceName: options.serviceName,
		callback: options.callback,
		form: form
	};
	this.passwordPrompts.push(promptInfo);
	// Make sure the wrapper is displayed
	this.setWrapperDisplay();
};

// Crypto helper object for encrypted content
$tw.utils.Crypto = function() {
	var sjcl = $tw.browser ? window.sjcl : require("./sjcl.js"),
		password = null,
		callSjcl = function(method,inputText) {
			var outputText;
			try {
				outputText = sjcl[method](password,inputText);
			} catch(ex) {
				console.log("Crypto error:" + ex);
				outputText = null;	
			}
			return outputText;
		};
	this.setPassword = function(newPassword) {
		password = newPassword;
	};
	this.encrypt = function(text) {
		return callSjcl("encrypt",text);
	};
	this.decrypt = function(text) {
		return callSjcl("decrypt",text);
	};
};

/////////////////////////// Server initialisation

var fs, path, vm;
if(!$tw.browser) {
	// Standard node libraries
	fs = require("fs");
	path = require("path");
	vm = require("vm");
	// System paths and filenames
	$tw.boot.bootFile = path.basename(module.filename);
	$tw.boot.bootPath = path.dirname(module.filename);
	$tw.boot.wikiPath = process.cwd();
	// Read package info
	$tw.packageInfo = JSON.parse(fs.readFileSync($tw.boot.bootPath + "/../package.json"));
	// Check node version number
	if($tw.utils.checkVersions($tw.packageInfo.engine.node.substr(2),process.version.substr(1))) {
		throw "TiddlyWiki5 requires node.js version " + $tw.packageInfo.engine.node;
	}
}

/////////////////////////// Module mechanism

/*
Apply a callback to each module of a particular type
	moduleType: type of modules to enumerate
	callback: function called as callback(title,moduleExports) for each module
*/
$tw.modules.forEachModuleOfType = function(moduleType,callback) {
	var modules = $tw.modules.types[moduleType];
	$tw.utils.each(modules,function(element,title,object) {
		callback(title,$tw.modules.execute(title));
	});
};

/*
Get all the modules of a particular type in a hashmap by their `name` field
*/
$tw.modules.getModulesByTypeAsHashmap = function(moduleType,nameField) {
	nameField = nameField || "name";
	var results = {};
	$tw.modules.forEachModuleOfType(moduleType,function(title,module) {
		results[module[nameField]] = module;
	});
	return results;
};

/*
Apply the exports of the modules of a particular type to a target object
*/
$tw.modules.applyMethods = function(moduleType,targetObject) {
	$tw.modules.forEachModuleOfType(moduleType,function(title,module) {
		$tw.utils.each(module,function(element,title,object) {
			targetObject[title] = module[title];
		});
	});
};

/////////////////////////// Barebones tiddler object

/*
Construct a tiddler object from a hashmap of tiddler fields. If multiple hasmaps are provided they are merged,
taking precedence to the right
*/
$tw.Tiddler = function(/* [fields,] fields */) {
	this.fields = {};
	for(var c=0; c<arguments.length; c++) {
		var arg = arguments[c],
			src = (arg instanceof $tw.Tiddler) ? arg.fields : arg;
		for(var t in src) {
			if(src[t] === undefined) {
				if(t in this.fields) {
					delete this.fields[t]; // If we get a field that's undefined, delete any previous field value
				}
			} else {
				// Parse the field with the associated field module (if any)
				var fieldModule = $tw.Tiddler.fieldModules[t];
				if(fieldModule) {
					this.fields[t] = fieldModule.parse.call(this,src[t]);
				} else {
					this.fields[t] = src[t];
				}
			}
		}
	}
};

$tw.Tiddler.prototype.hasField = function(field) {
	return $tw.utils.hop(this.fields,field);
};

/*
Hashmap of field modules by field name
*/
$tw.Tiddler.fieldModules = {};

/*
Register and install the built in tiddler field modules
*/
$tw.modules.define("$:/boot/tiddlerfields/modified","tiddlerfield",{
	name: "modified",
	parse: $tw.utils.parseDate,
	stringify: $tw.utils.stringifyDate
});
$tw.modules.define("$:/boot/tiddlerfields/created","tiddlerfield",{
	name: "created",
	parse: $tw.utils.parseDate,
	stringify: $tw.utils.stringifyDate
});
$tw.modules.define("$:/boot/tiddlerfields/tags","tiddlerfield",{
	name: "tags",
	parse: $tw.utils.parseStringArray,
	stringify: function(value) {
		var result = [];
		for(var t=0; t<value.length; t++) {
			if(value[t].indexOf(" ") !== -1) {
				result.push("[[" + value[t] + "]]");
			} else {
				result.push(value[t]);
			}
		}
		return result.join(" ");
	}
});

/////////////////////////// Barebones wiki store

/*
Construct a wiki store object
*/
$tw.Wiki = function() {
	this.tiddlers = {};
	this.bundles = {}; // Hashmap of plugin information by title
	this.bundledTiddlers = {}; // Hashmap of constituent tiddlers from plugins by title
};

$tw.Wiki.prototype.addTiddler = function(tiddler) {
	if(!(tiddler instanceof $tw.Tiddler)) {
		tiddler = new $tw.Tiddler(tiddler);
	}
	this.tiddlers[tiddler.fields.title] = tiddler;
};

$tw.Wiki.prototype.addTiddlers = function(tiddlers) {
	for(var t=0; t<tiddlers.length; t++) {
		this.addTiddler(tiddlers[t]);
	}	
};

/*
Extract constituent tiddlers from bundle tiddlers so that we can easily access them in getTiddler()
*/
$tw.Wiki.prototype.unpackBundleTiddlers = function() {
	// Collect up all the plugin tiddlers
	var self = this;
	$tw.utils.each(this.tiddlers,function(tiddler,title,object) {
		if(tiddler.fields.type === "application/json" && tiddler.hasField("bundle")) {
			// Save the bundle information
			var bundleInfo = self.bundles[title] = JSON.parse(tiddler.fields.text);
			// Extract the constituent tiddlers
			for(var t in bundleInfo.tiddlers) {
				var constituentTiddler = bundleInfo.tiddlers[t],
					constituentTitle = bundleInfo.title + "/" + t;
				// Don't overwrite tiddlers that already exist
				if(!$tw.utils.hop(self.bundledTiddlers,constituentTitle)) {
					// Save the tiddler object
					self.bundledTiddlers[constituentTitle] = new $tw.Tiddler(constituentTiddler,{title: constituentTitle});
				}
			}
		}
	});
};

/*
Define all modules stored in ordinary tiddlers
*/
$tw.Wiki.prototype.defineTiddlerModules = function() {
	$tw.utils.each(this.tiddlers,function(tiddler,title,object) {
		if(tiddler.fields.type === "application/javascript" && tiddler.hasField("module-type")) {
			// Define the module
			$tw.modules.define(tiddler.fields.title,tiddler.fields["module-type"],tiddler.fields.text);
		}
	});
};

/*
Register all the module tiddlers that have a module type
*/
$tw.Wiki.prototype.defineBundledModules = function() {
	var self = this;
	$tw.utils.each(this.bundledTiddlers,function(element,title,object) {
		var tiddler = self.getTiddler(title);
		if(!$tw.utils.hop(self.tiddlers,title)) { // Don't define the module if it is overidden by an ordinary tiddler
			if(tiddler.fields.type === "application/javascript" && tiddler.hasField("module-type")) {
				// Define the module
				$tw.modules.define(tiddler.fields.title,tiddler.fields["module-type"],tiddler.fields.text);
			}
		}
	});
};

$tw.Wiki.prototype.getTiddler = function(title) {
	var t = this.tiddlers[title];
	if(t instanceof $tw.Tiddler) {
		return t;
	} else if($tw.utils.hop(this.bundledTiddlers,title)) {
		return this.bundledTiddlers[title];
	} else {
		return null;
	}
};

/*
Hashmap of serializer modules by serializer name
*/
$tw.Wiki.tiddlerDeserializerModules = {};

/*
Extracts tiddlers from a typed block of text, specifying default field values
*/
$tw.Wiki.prototype.deserializeTiddlers = function(type,text,srcFields) {
	srcFields = srcFields || {};
	var deserializer = $tw.Wiki.tiddlerDeserializerModules[type],
		fields = {};
	if(!deserializer && $tw.config.fileExtensionInfo[type]) {
		// If we didn't find the serializer, try converting it from an extension to a content type
		type = $tw.config.fileExtensionInfo[type].type;
		deserializer = $tw.Wiki.tiddlerDeserializerModules[type];
	}
	if(!deserializer) {
		// If we still don't have a deserializer, treat it as plain text
		deserializer = $tw.Wiki.tiddlerDeserializerModules["text/plain"];
	}
	for(var f in srcFields) {
		fields[f] = srcFields[f];
	}
	if(deserializer) {
		return deserializer.call(this,text,fields);
	} else {
		// Return a raw tiddler for unknown types
		fields.text = text;
		return [fields];
	}
};

/*
Register the built in tiddler deserializer modules
*/
$tw.modules.define("$:/boot/tiddlerdeserializer/js","tiddlerdeserializer",{
	"application/javascript": function(text,fields) {
		var headerCommentRegExp = new RegExp($tw.config.jsModuleHeaderRegExpString,"mg"),
			match = headerCommentRegExp.exec(text);
		fields.text = text;
		if(match) {
			fields = $tw.utils.parseFields(match[1].split(/\r?\n\r?\n/mg)[0],fields);
		}
		return [fields];
	}
});
$tw.modules.define("$:/boot/tiddlerdeserializer/tid","tiddlerdeserializer",{
	"application/x-tiddler": function(text,fields) {
		var split = text.split(/\r?\n\r?\n/mg);
		if(split.length > 1) {
			fields = $tw.utils.parseFields(split[0],fields);
			fields.text = split.slice(1).join("\n\n");
		} else {
			fields.text = text;
		}
		return [fields];
	}
});
$tw.modules.define("$:/boot/tiddlerdeserializer/txt","tiddlerdeserializer",{
	"text/plain": function(text,fields) {
		fields.text = text;
		fields.type = "text/plain";
		return [fields];
	}
});
$tw.modules.define("$:/boot/tiddlerdeserializer/html","tiddlerdeserializer",{
	"text/html": function(text,fields) {
		fields.text = text;
		fields.type = "text/html";
		return [fields];
	}
});
$tw.modules.define("$:/boot/tiddlerdeserializer/json","tiddlerdeserializer",{
	"application/json": function(text,fields) {
		var tiddlers = JSON.parse(text);
		return tiddlers;
	}
});

/////////////////////////// Intermediate initialisation

/*
Create the wiki store for the app
*/
$tw.wiki = new $tw.Wiki();

/////////////////////////// Browser definitions

if($tw.browser) {

/*
Get any encrypted tiddlers
*/
$tw.boot.decryptEncryptedTiddlers = function(callback) {
	var encryptedArea = document.getElementById("encryptedArea"),
		encryptedTiddlers = [];
	if(encryptedArea) {
		for(var t = 0; t <encryptedArea.childNodes.length; t++) {
			var childNode = encryptedArea.childNodes[t];
			if(childNode.hasAttribute && childNode.hasAttribute("data-tw-encrypted-tiddlers")) {
				var e = childNode.firstChild;
				while(e && e.nodeName.toLowerCase() !== "pre") {
					e = e.nextSibling;
				}
				encryptedTiddlers.push($tw.utils.htmlDecode(e.innerHTML));
			}
		}
		// Prompt for the password
		$tw.passwordPrompt.createPrompt({
			serviceName: "Enter a password to decrypt this TiddlyWiki",
			noUserName: true,
			submitText: "Decrypt",
			callback: function(data) {
				// Attempt to decrypt the tiddlers
				$tw.crypto.setPassword(data.password);
				for(var t=encryptedTiddlers.length-1; t>=0; t--) {
					var decrypted = $tw.crypto.decrypt(encryptedTiddlers[t]);
					if(decrypted) {
						var json = JSON.parse(decrypted);
						for(var title in json) {
							$tw.preloadTiddler(json[title]);
						}
						encryptedTiddlers.splice(t,1);
					}
				}
				// Check if we're all done
				if(encryptedTiddlers.length === 0) {
					// Call the callback
					callback();
					// Exit and remove the password prompt
					return true;
				} else {
					// We didn't decrypt everything, so continue to prompt for password
					return false;
				}
			}
		});
	} else {
		// Just invoke the callback straight away if there wasn't any encrypted tiddlers
		callback();
	}
};

/*
Execute the module named 'moduleName'. The name can optionally be relative to the module named 'moduleRoot'
*/
$tw.modules.execute = function(moduleName,moduleRoot) {
	/*jslint evil: true */
	var name = moduleRoot ? $tw.utils.resolvePath(moduleName,moduleRoot) : moduleName,
		require = function(modRequire) {
			return $tw.modules.execute(modRequire,name);
		},
		exports = {},
		moduleInfo = $tw.modules.titles[name];
	if(!moduleInfo) {
		throw new Error("Cannot find module named '" + moduleName + "' required by module '" + moduleRoot + "', resolved to " + name);
	}
	if(!moduleInfo.exports) {
		if(typeof moduleInfo.definition === "string") { // String
			moduleInfo.definition = window["eval"]("(function(module,exports,require) {" + moduleInfo.definition + "})");
			moduleInfo.exports = {};
			moduleInfo.definition(moduleInfo,moduleInfo.exports,require);
		} else if(typeof moduleInfo.definition === "function") { // Function
			moduleInfo.exports = {};
			moduleInfo.definition(moduleInfo,moduleInfo.exports,require);
		} else { // Object
			moduleInfo.exports = moduleInfo.definition;
		}
	}
	return moduleInfo.exports;
};

/*
Register a deserializer that can extract tiddlers from the DOM
*/
$tw.modules.define("$:/boot/tiddlerdeserializer/dom","tiddlerdeserializer",{
	"(DOM)": function(node) {
		var extractTextTiddlers = function(node) {
				var e = node.firstChild;
				while(e && e.nodeName.toLowerCase() !== "pre") {
					e = e.nextSibling;
				}
				var title = node.getAttribute ? node.getAttribute("title") : null;
				if(e && title) {
					var attrs = node.attributes,
						tiddler = {
							text: $tw.utils.htmlDecode(e.innerHTML)
						};
					for(var i=attrs.length-1; i >= 0; i--) {
						tiddler[attrs[i].name] = attrs[i].value;
					}
					return [tiddler];
				} else {
					return null;
				}
			},
			extractModuleTiddlers = function(node) {
				if(node.hasAttribute && node.hasAttribute("data-tiddler-title")) {
					var text = node.innerHTML,
						s = text.indexOf("{"),
						e = text.lastIndexOf("}");
					if(node.hasAttribute("data-module") && s !== -1 && e !== -1) {
						text = text.substring(s+1,e);
					}
					var fields = {text: text},
						attributes = node.attributes;
					for(var a=0; a<attributes.length; a++) {
						if(attributes[a].nodeName.substr(0,13) === "data-tiddler-") {
							fields[attributes[a].nodeName.substr(13)] = attributes[a].value;
						}
					}
					return [fields];
				} else {
					return null;
				}
			},
			t,result = [];
		if(node) {
			for(t = 0; t < node.childNodes.length; t++) {
					var tiddlers = extractTextTiddlers(node.childNodes[t]),
						childNode = node.childNodes[t];
					tiddlers = tiddlers || extractModuleTiddlers(childNode);
					if(tiddlers) {
						result.push.apply(result,tiddlers);
					}
			}
		}
		return result;
	}
});

$tw.loadTiddlers = function() {
	// In the browser, we load tiddlers from certain elements
	var containerIds = [
		"libraryModules",
		"modules",
		"bootKernelPrefix",
		"bootKernel",
		"styleArea",
		"storeArea",
		"shadowArea"
	];
	for(var t=0; t<containerIds.length; t++) {
		$tw.wiki.addTiddlers($tw.wiki.deserializeTiddlers("(DOM)",document.getElementById(containerIds[t])));
	}
	// Load any preloaded tiddlers
	if($tw.preloadTiddlers) {
		$tw.wiki.addTiddlers($tw.preloadTiddlers);
	}
};

// End of if($tw.browser)
}

/////////////////////////// Server definitions

if(!$tw.browser) {

/*
Get any encrypted tiddlers
*/
$tw.boot.decryptEncryptedTiddlers = function(callback) {
	// Storing encrypted tiddlers on the server isn't supported yet
	callback();
};

/*
Load the tiddlers contained in a particular file (and optionally extract fields from the accompanying .meta file)
*/
$tw.loadTiddlersFromFile = function(filepath,fields) {
	var ext = path.extname(filepath),
		extensionInfo = $tw.config.fileExtensionInfo[ext],
		typeInfo = extensionInfo ? $tw.config.contentTypeInfo[extensionInfo.type] : null,
		data = fs.readFileSync(filepath,typeInfo ? typeInfo.encoding : "utf8"),
		tiddlers = $tw.wiki.deserializeTiddlers(ext,data,fields),
		metafile = filepath + ".meta";
	if(ext !== ".json" && tiddlers.length === 1 && fs.existsSync(metafile)) {
		var metadata = fs.readFileSync(metafile,"utf8");
		if(metadata) {
			tiddlers = [$tw.utils.parseFields(metadata,tiddlers[0])];
		}
	}
	return tiddlers;
};

/*
Load all the tiddlers from a directory
*/
$tw.loadTiddlersFromPath = function(filepath,excludeRegExp) {
	excludeRegExp = excludeRegExp || /^\.DS_Store$|.meta$/;
	var tiddlers = [],
		stat, files, pluginInfo, pluginTiddlers, f, file, titlePrefix, t, filesInfo, p, tidInfo, typeInfo, text;
	if(fs.existsSync(filepath)) {
		stat = fs.statSync(filepath);
		if(stat.isDirectory()) {
			files = fs.readdirSync(filepath);
			// Look for a tiddlywiki.files file
			if(files.indexOf("tiddlywiki.files") !== -1) {
				// If so, process the files it describes
				filesInfo = JSON.parse(fs.readFileSync(filepath + "/tiddlywiki.files","utf8"));
				for(p=0; p<filesInfo.tiddlers.length; p++) {
					tidInfo = filesInfo.tiddlers[p];
					typeInfo = $tw.config.contentTypeInfo[tidInfo.fields.type || "text/plain"];
					text = fs.readFileSync(path.resolve(filepath,tidInfo.file),typeInfo ? typeInfo.encoding : "utf8");
					tidInfo.fields.text = text;
					tiddlers.push(tidInfo.fields);
				}
			} else {
				// If not, read all the files in the directory
				for(f=0; f<files.length; f++) {
					file = files[f];
					if(!excludeRegExp.test(file)) {
						tiddlers.push.apply(tiddlers,$tw.loadTiddlersFromPath(filepath + "/" + file,excludeRegExp));
					}
				}
			}
		} else if(stat.isFile()) {
			tiddlers.push.apply(tiddlers,$tw.loadTiddlersFromFile(filepath));
		}
	}
	return tiddlers;
};

/*
Load the tiddlers from a bundle folder, and package them up into a proper JSON bundle tiddler
*/
$tw.loadBundleFolder = function(filepath,excludeRegExp) {
	excludeRegExp = excludeRegExp || /^\.DS_Store$|.meta$/;
	var stat, files, bundleInfo, bundleTiddlers = [], f, file, titlePrefix, t;
	if(fs.existsSync(filepath)) {
		stat = fs.statSync(filepath);
		if(stat.isDirectory()) {
			files = fs.readdirSync(filepath);
			// Read the plugin information
			bundleInfo = JSON.parse(fs.readFileSync(filepath + "/plugin.bundle","utf8"));
			// Read the bundle files
			for(f=0; f<files.length; f++) {
				file = files[f];
				if(!excludeRegExp.test(file) && file !== "plugin.bundle" && file !== "tiddlywiki.files") {
					bundleTiddlers.push.apply(bundleTiddlers,$tw.loadTiddlersFromPath(filepath + "/" + file,excludeRegExp));
				}
			}
			// Save the bundle tiddlers into the bundle
			bundleInfo.tiddlers = bundleInfo.tiddlers || {};
			titlePrefix = bundleInfo.title + "/";
			for(t=0; t<bundleTiddlers.length; t++) {
				// Check that the constituent tiddler has the bundle title as a prefix
				if(bundleTiddlers[t].title.indexOf(titlePrefix) === 0 && bundleTiddlers[t].title.length > titlePrefix.length) {
					bundleInfo.tiddlers[bundleTiddlers[t].title.substr(titlePrefix.length)] = bundleTiddlers[t];
				} else {
					console.log("Error extracting plugin bundle: The bundle '" + bundleInfo.title + "' cannot contain a tiddler titled '" + bundleTiddlers[t].title + "'");
				}
			}
		}
	}
	// Save the bundle tiddler
	return bundleInfo ? {
		title: bundleInfo.title,
		type: "application/json",
		bundle: "yes",
		text: JSON.stringify(bundleInfo)
	} : null;
};

/*
Execute the module named 'moduleName'. The name can optionally be relative to the module named 'moduleRoot'
*/
$tw.modules.execute = function(moduleName,moduleRoot) {
	var name = moduleRoot ? $tw.utils.resolvePath(moduleName,moduleRoot) : moduleName,
		moduleInfo = $tw.modules.titles[name],
		tiddler = $tw.wiki.getTiddler(name),
		sandbox = {
			module: moduleInfo,
			exports: {},
			console: console,
			process: process,
			$tw: $tw,
			require: function(title) {
				return $tw.modules.execute(title,name);
			}
		};
	if(!moduleInfo) {
		// If we don't have a module with that name, let node.js try to find it
		return require(moduleName);
	}
	// Execute the module if we haven't already done so
	if(!moduleInfo.exports) {
		try {
			// Check the type of the definition
			if(typeof moduleInfo.definition === "string") { // String
				vm.runInNewContext(moduleInfo.definition,sandbox,tiddler.fields.title);
				moduleInfo.exports = sandbox.exports;
			} else if(typeof moduleInfo.definition === "function") { // Function
				moduleInfo.exports = moduleInfo.definition(moduleInfo,sandbox.require,moduleInfo.exports);
			} else { // Object
				moduleInfo.exports = moduleInfo.definition;
			}
		} catch(e) {
			throw "Error executing boot module " + name + ":\n" + e;
		}
	}
	// Return the exports of the module
	return moduleInfo.exports;
};

$tw.loadTiddlers = function() {
	// On the server, we load tiddlers from specified folders
	var folders = [
		$tw.boot.bootPath,
		path.resolve($tw.boot.wikiPath,$tw.config.wikiShadowsSubDir),
		path.resolve($tw.boot.wikiPath,$tw.config.wikiTiddlersSubDir)
	];
	for(var t=0; t<folders.length; t++) {
		$tw.wiki.addTiddlers($tw.loadTiddlersFromPath(folders[t]));
	}
	// Load any plugins listed in the wiki info file
	var wikiInfoPath = path.resolve($tw.boot.wikiPath,$tw.config.wikiInfo),
		bundle;
	if(fs.existsSync(wikiInfoPath)) {
		var wikiInfo = JSON.parse(fs.readFileSync(wikiInfoPath,"utf8")),
			pluginBasePath = path.resolve($tw.boot.bootPath,$tw.config.pluginsPath);
		for(t=0; t<wikiInfo.plugins.length; t++) {
			bundle = $tw.loadBundleFolder(path.resolve(pluginBasePath,"./" + wikiInfo.plugins[t]));
			if(bundle) {
				$tw.wiki.addTiddler(bundle);
			}
		}
	}
	// Load any plugins within the wiki folder
	var wikiPluginsPath = path.resolve($tw.boot.wikiPath,$tw.config.wikiPluginsSubDir);
	if(fs.existsSync(wikiPluginsPath)) {
		var pluginFolders = fs.readdirSync(wikiPluginsPath);
		for(t=0; t<pluginFolders.length; t++) {
			bundle = $tw.loadBundleFolder(path.resolve(wikiPluginsPath,"./" + pluginFolders[t]));
			if(bundle) {
				$tw.wiki.addTiddler(bundle);
			}
		}
	}
};

// End of if(!$tw.browser)	
}

/////////////////////////// Starting up

/*
Main startup function
*/
$tw.boot.startup = function() {
	// Install built in tiddler fields modules
	$tw.Tiddler.fieldModules = $tw.modules.getModulesByTypeAsHashmap("tiddlerfield");
	// Install the tiddler deserializer modules
	$tw.modules.applyMethods("tiddlerdeserializer",$tw.Wiki.tiddlerDeserializerModules);
	// Load tiddlers
	$tw.loadTiddlers();
	// Unpack bundle tiddlers
	$tw.wiki.unpackBundleTiddlers();
	// Register typed modules from the tiddlers we've just loaded
	if(!$tw.browser) {
		$tw.wiki.defineTiddlerModules();
	}
	$tw.wiki.defineBundledModules();
	// Run any startup modules
	$tw.modules.forEachModuleOfType("startup",function(title,module) {
		if(module.startup) {
			module.startup();
		}
	});
};

/*
Initialise crypto and then startup
*/
// Initialise crypto object
$tw.crypto = new $tw.utils.Crypto();
// Initialise password prompter
if($tw.browser) {
	$tw.passwordPrompt = new $tw.utils.PasswordPrompt();
}
// Get any encrypted tiddlers
$tw.boot.decryptEncryptedTiddlers(function() {
	$tw.boot.startup();
});

})();