repr.js

来自「一个简单的AJAX图书展示平台」· JavaScript 代码 · 共 91 行

/*
	Copyright (c) 2004-2006, The Dojo Foundation
	All Rights Reserved.

	Licensed under the Academic Free License version 2.1 or above OR the
	modified BSD license. For more information on Dojo licensing, see:

		http://dojotoolkit.org/community/licensing.shtml
*/

dojo.provide("dojo.lang.repr");

dojo.require("dojo.lang.common");
dojo.require("dojo.AdapterRegistry");
dojo.require("dojo.string.extras");

dojo.lang.reprRegistry = new dojo.AdapterRegistry();
dojo.lang.registerRepr = function(name, check, wrap, /*optional*/ override){
        /***
			Register a repr function.  repr functions should take
			one argument and return a string representation of it
			suitable for developers, primarily used when debugging.

			If override is given, it is used as the highest priority
			repr, otherwise it will be used as the lowest.
        ***/
        dojo.lang.reprRegistry.register(name, check, wrap, override);
    };

dojo.lang.repr = function(obj){
	/***
		Return a "programmer representation" for an object
	***/
	if(typeof(obj) == "undefined"){
		return "undefined";
	}else if(obj === null){
		return "null";
	}

	try{
		if(typeof(obj["__repr__"]) == 'function'){
			return obj["__repr__"]();
		}else if((typeof(obj["repr"]) == 'function')&&(obj.repr != arguments.callee)){
			return obj["repr"]();
		}
		return dojo.lang.reprRegistry.match(obj);
	}catch(e){
		if(typeof(obj.NAME) == 'string' && (
				obj.toString == Function.prototype.toString ||
				obj.toString == Object.prototype.toString
			)){
			return o.NAME;
		}
	}

	if(typeof(obj) == "function"){
		obj = (obj + "").replace(/^\s+/, "");
		var idx = obj.indexOf("{");
		if(idx != -1){
			obj = obj.substr(0, idx) + "{...}";
		}
	}
	return obj + "";
}

dojo.lang.reprArrayLike = function(arr){
	try{
		var na = dojo.lang.map(arr, dojo.lang.repr);
		return "[" + na.join(", ") + "]";
	}catch(e){ }
};

dojo.lang.reprString = function(str){ 
	dojo.deprecated("dojo.lang.reprNumber", "use `String(num)` instead", "0.4");
	return dojo.string.escapeString(str);
};

dojo.lang.reprNumber = function(num){
	dojo.deprecated("dojo.lang.reprNumber", "use `String(num)` instead", "0.4");
	return num + "";
};

(function(){
	var m = dojo.lang;
	m.registerRepr("arrayLike", m.isArrayLike, m.reprArrayLike);
	m.registerRepr("string", m.isString, m.reprString);
	m.registerRepr("numbers", m.isNumber, m.reprNumber);
	m.registerRepr("boolean", m.isBoolean, m.reprNumber);
	// m.registerRepr("numbers", m.typeMatcher("number", "boolean"), m.reprNumber);
})();