jsDump.js

/**
 * jsDump
 * Copyright (c) 2008 Ariel Flesler - aflesler(at)gmail(dot)com | http://flesler.blogspot.com
 * Licensed under BSD (http://www.opensource.org/licenses/bsd-license.php)
 * Date: 5/15/2008
 * @projectDescription Advanced and extensible data dumping for Javascript.
 * @version 1.0.0
 * @author Ariel Flesler
 * @link {http://flesler.blogspot.com/2008/05/jsdump-pretty-dump-of-any-javascript.html}
 */
var jsDump;

(function(){
	function quote( str ){
		return '"' + str.toString().replace(/"/g, '\\"') + '"';
	}
	function literal( o ){
		return o + '';
	}
	function join( pre, arr, post ){
		var s = jsDump.separator(),
			base = jsDump.indent(),
			inner = jsDump.indent(1);
		if( arr.join )
			arr = arr.join( ',' + s + inner );
		if( !arr )
			return pre + post;
		return [ pre, inner + arr, base + post ].join(s);
	}
	function array( arr ){
		var i = arr.length, ret = Array(i);
		this.up();
		while( i-- )
			ret[i] = this.parse( arr[i] );
		this.down();
		return join( '[', ret, ']' );
	}
	
	var reName = /^function (\w+)/;
	
	jsDump = {
		parse:function( obj, type ){//type is used mostly internally, you can fix a (custom)type in advance
			var parser = this.parsers[ type || this.typeOf(obj) ];
			type = typeof parser;
			
			return type == 'function' ? parser.call( this, obj ) :
				type == 'string' ? parser :
				this.parsers.error;
		},
		typeOf:function( obj ){
			var type = typeof obj,
				kind;

			if ( type == 'object' || type == 'function' ) {
				if ( obj === null )
					return 'null';

				// Extract Stuff from [Object Stuff]
				kind = Object.prototype.toString.call(obj).slice(8, -1);
				switch ( kind ) {
					case 'Array':
						return 'array';

					case 'Date':
						return 'date';

					case 'RegExp':
						return 'regexp';

					case 'Window': //Firefox, IE, Opera
					case 'DOMWindow': //WebKit
					case 'global':
						return 'window';

					case 'HTMLDocument': //WebKit, Firefox, Opera
					case 'Document': // IE
						return 'document';

					case 'NodeList':
						return 'nodelist';

					default:
						if ( 'callee' in obj )
							// Opera: Object.prototype.toString.call(arguments) == 'Object' :(
							return 'arguments';
						else if (window.jQuery && obj instanceof window.jQuery)
							return 'jquery';
						else if ( 'ownerDocument' in obj && 'defaultView' in obj.ownerDocument && obj instanceof obj.ownerDocument.defaultView.Node )
							return 'node';
				}
			}
			return type;
		},
		separator:function(){
			return this.multiline ? this.HTML ? '<br />' : '\n' : this.HTML ? '&nbsp;' : ' ';
		},
		indent:function( extra ){// extra can be a number, shortcut for increasing-calling-decreasing
			if( !this.multiline )
				return '';
			var chr = this.indentChar;
			if( this.HTML )
				chr = chr.replace(/\t/g,'   ').replace(/ /g,'&nbsp;');
			return Array( this._depth_ + (extra||0) ).join(chr);
		},
		up:function( a ){
			this._depth_ += a || 1;
		},
		down:function( a ){
			this._depth_ -= a || 1;
		},
		setParser:function( name, parser ){
			this.parsers[name] = parser;
		},
		// The next 3 are exposed so you can use them
		quote:quote, 
		literal:literal,
		join:join,
		_depth_: 1,
		// This is the list of parsers, to modify them, use jsDump.setParser
		parsers:{
			window: '[Window]',
			document: '[Document]',
			error:'[ERROR]', //when no parser is found, shouldn't happen
			unknown: '[Unknown]',
			'null':'null',
			undefined:'undefined',
			'function':function( fn ){
				var ret = 'function',
					name = 'name' in fn ? fn.name : (reName.exec(fn)||[])[1];//functions never have name in IE
				if( name )
					ret += ' ' + name;
				ret += '(';
				ret = [ ret, this.parse( fn, 'functionArgs' ), '){'].join('');
				return join( ret, this.parse(fn,'functionCode'), '}' );
			},
			array: array,
			nodelist: array,
			arguments: array,
			jquery:array,
			object:function( map ){
				if (this._depth_ >= this.maxDepth) {
					this._depth_ = 1; // Reset for future use
					throw new Error("Object nesting exceeded jsDump.maxDepth (" + jsDump.maxDepth + ")");
				}
				var ret = [ ];
				this.up();
				for( var key in map )
					ret.push( this.parse(key,'key') + ': ' + this.parse(map[key]) );
				this.down();
				return join( '{', ret, '}' );
			},
			node:function( node ){
				var open = this.HTML ? '&lt;' : '<',
					close = this.HTML ? '&gt;' : '>';
				var tag = node.nodeName.toLowerCase(),
					ret = open + tag;
				for( var a in this.DOMAttrs ){
					var val = node[this.DOMAttrs[a]];
					if( val )
						ret += ' ' + a + '=' + this.parse( val, 'attribute' );
				}
				return ret + close + open + '/' + tag + close;
			},
			functionArgs:function( fn ){//function calls it internally, it's the arguments part of the function
				var l = fn.length;
				if( !l ) return '';
				var args = Array(l);
				while( l-- )
					args[l] = String.fromCharCode(97+l);//97 is 'a'
				return ' ' + args.join(', ') + ' ';
			},
			key:quote, //object calls it internally, the key part of an item in a map
			functionCode:'[code]', //function calls it internally, it's the content of the function
			attribute:quote, //node calls it internally, it's an html attribute value
			string:quote,
			date:quote,
			regexp:literal, //regex
			number:literal,
			'boolean':literal
		},
		DOMAttrs:{//attributes to dump from nodes, name=>realName
			id:'id',
			name:'name',
			'class':'className'
		},
		HTML:false,//if true, entities are escaped ( <, >, \t, space and \n )
		indentChar:'   ',//indentation unit
		multiline:true, //if true, items in a collection, are separated by a \n, else just a space.
		maxDepth:100 //maximum depth of object nesting
	};

})();

if (typeof exports !== 'undefined') {
	module.exports = jsDump;
}