yangg/strbuf.js

## strbuf.js
/*!
 * StrBuf: A javascript string buffer class
 * @author uedsky (http://uedsky.com)
 * Last Modified: Dec 17, 2011
 */

/**
 * @class String concat
 * @return {StrBuf/String}
 * @constructor
 * eg:
    var buf = new StrBuf("contructor str<br/>");
    buf.push("hello,<br/>")
    .push("Today is {0}, {1}<br/>", "Monday", "March 28th")
    .push("I like ${like}, my name is ${name}, my qq is ${im.qq}, msn is ${im.msn}", {
        like: "Vim",
        name: "yang",
        im: {qq: '999999', msn: 'me@live.cn'}
    });
    document.write(buf);// auto call toString method
    console.log(buf);
    console.log(StrBuf("static {0} method", "invoke"));
 */
function StrBuf(s) {
    this.__data = [];
    if(s) {
        var args = arguments, buf;
        if(this instanceof StrBuf) {
            this.push.apply(this, args);
        } else {// static invoke
            buf = new StrBuf();
            return buf.push.apply(buf, args).toString();
        }
    }
}
StrBuf.prototype = {
    /**
     * add String to the instance
     * @return StrBuf make it chainability
     */
    push: function(s, /*{Object/String...} */o, _undef) {
        var args = arguments, str;
        if(args.length < 2) {
            str = s === undefined ? '' : s;
        } else if(typeof o == 'object') {
            str = s.replace(/\$\{([\w.]+)\}/g, function($, $1) {
                var parts = $1.split('.'), i = 0, len = parts.length, res = o;
                while(i < len) {
                    try {
                        res = res[parts[i++]];
                    } catch(ex){
                        res = $;
                    }
                }
                return res === undefined ? _undef : res;
            });
        } else {
            str = s.replace(/\{(\d+)\}/g, function($, $1) {
                return args[+$1 + 1];
            });
        }
        this.__data.push(str);
        return this;// chainability
    },
    /**
     * get the final string
     * @param {String} delimiter default to ''(empty string)
     */
    toString: function(delimiter) {
        return this.__data.join(delimiter === undefined ? '' : delimiter);
    }
};

## test.html
<!DOCTYPE HTML>
<html>
<head>
    <meta charset="UTF-8" />
    <title></title>
</head>
<body>

</body>
<script src="strbuf.js"></script>
<script>
    var buf = new StrBuf("contructor str<br/>");
    buf.push("hello,<br/>")
    .push("Today is {0}, {1}<br/>", "Monday", "March 28th")
    .push("I like ${like}, my name is ${name}, my qq is ${im.qq}, msn is ${im.msn},<br/>${test.test2.son}, ${test.test2.daughter}", {
        like: "Vim",
        name: "yangg",
        im: {qq: '999999', msn: 'me@live.cn'},
        test: { test2: {son:'test grand son', daughter: 'test grand daughter'}}
    });
    document.write(buf);// auto call toString method
    console.log(buf);
    console.log(StrBuf("static {0} method", "invoke"));
</script>
</html>
	/*!
	* StrBuf: A javascript string buffer class
	* @author uedsky (http://uedsky.com)
	* Last Modified: Dec 17, 2011
	*/

	/**
	* @class String concat
	* @return {StrBuf/String}
	* @constructor
	* eg:
	var buf = new StrBuf("contructor str<br/>");
	buf.push("hello,<br/>")
	.push("Today is {0}, {1}<br/>", "Monday", "March 28th")
	.push("I like ${like}, my name is ${name}, my qq is ${im.qq}, msn is ${im.msn}", {
	like: "Vim",
	name: "yang",
	im: {qq: '999999', msn: 'me@live.cn'}
	});
	document.write(buf);// auto call toString method
	console.log(buf);
	console.log(StrBuf("static {0} method", "invoke"));
	*/
	function StrBuf(s) {
	this.__data = [];
	if(s) {
	var args = arguments, buf;
	if(this instanceof StrBuf) {
	this.push.apply(this, args);
	} else {// static invoke
	buf = new StrBuf();
	return buf.push.apply(buf, args).toString();
	}
	}
	}
	StrBuf.prototype = {
	/**
	* add String to the instance
	* @return StrBuf make it chainability
	*/
	push: function(s, /{Object/String...} /o, _undef) {
	var args = arguments, str;
	if(args.length < 2) {
	str = s === undefined ? '' : s;
	} else if(typeof o == 'object') {
	str = s.replace(/\$\{([\w.]+)\}/g, function($, $1) {
	var parts = $1.split('.'), i = 0, len = parts.length, res = o;
	while(i < len) {
	try {
	res = res[parts[i++]];
	} catch(ex){
	res = $;
	}
	}
	return res === undefined ? _undef : res;
	});
	} else {
	str = s.replace(/\{(\d+)\}/g, function($, $1) {
	return args[+$1 + 1];
	});
	}
	this.__data.push(str);
	return this;// chainability
	},
	/**
	* get the final string
	* @param {String} delimiter default to ''(empty string)
	*/
	toString: function(delimiter) {
	return this.__data.join(delimiter === undefined ? '' : delimiter);
	}
	};
	<!DOCTYPE HTML>
	<html>
	<head>
	<meta charset="UTF-8" />
	<title></title>
	</head>
	<body>

	</body>
	<script src="strbuf.js"></script>
	<script>
	var buf = new StrBuf("contructor str<br/>");
	buf.push("hello,<br/>")
	.push("Today is {0}, {1}<br/>", "Monday", "March 28th")
	.push("I like ${like}, my name is ${name}, my qq is ${im.qq}, msn is ${im.msn},<br/>${test.test2.son}, ${test.test2.daughter}", {
	like: "Vim",
	name: "yangg",
	im: {qq: '999999', msn: 'me@live.cn'},
	test: { test2: {son:'test grand son', daughter: 'test grand daughter'}}
	});
	document.write(buf);// auto call toString method
	console.log(buf);
	console.log(StrBuf("static {0} method", "invoke"));
	</script>
	</html>