beautify-css.js

/*

 CSS Beautifier
---------------

    Written by Harutyun Amirjanyan, (amirjanyan@gmail.com)

    Based on code initially developed by: Einar Lielmanis, <elfz@laacz.lv>
        http://jsbeautifier.org/


    You are free to use this in any way you want, in case you find this useful or working for you.

    Usage:
        css_beautify(source_text);
        css_beautify(source_text, options);

    The options are:
        indent_size (default 4)          — indentation size,
        indent_char (default space)      — character to indent with,

    e.g

    css_beautify(css_source_text, {
      'indent_size': 1,
      'indent_char': '\t'
    });
*/

// http://www.w3.org/TR/CSS21/syndata.html#tokenization
// http://www.w3.org/TR/css3-syntax/
function css_beautify(source_text, options) {
    options = options || {};
    var indentSize = options.indent_size || 4;
    var indentCharacter = options.indent_char || ' ';

    // compatibility
    if (typeof indentSize == "string")
        indentSize = parseInt(indentSize);


    // tokenizer
    var whiteRe = /^\s+$/;
    var wordRe = /[\w$\-_]/;

    var pos = -1, ch;
    function next() {
        return ch = source_text.charAt(++pos)
    }
    function peek() {
        return source_text.charAt(pos+1)
    }
    function eatString(comma) {
        var start = pos;
        while(next()){
            if (ch=="\\"){
                next();
                next();
            } else if (ch == comma) {
                break;
            } else if (ch == "\n") {
                break;
            }
        }
        return source_text.substring(start, pos + 1);
    }

    function eatWhitespace() {
        var start = pos;
        while (whiteRe.test(peek()))
            pos++;
        return pos != start;
    }

    function skipWhitespace() {
        var start = pos;
        do{
        }while (whiteRe.test(next()))
        return pos != start + 1;
    }

    function eatComment() {
        var start = pos;
        next();
        while (next()) {
            if (ch == "*" && peek() == "/") {
                pos ++;
                break;
            }
        }

        return source_text.substring(start, pos + 1);
    }


    function lookBack(str, index) {
        return output.slice(-str.length + (index||0), index).join("").toLowerCase() == str;
    }

    // printer
    var indentString = source_text.match(/^[\r\n]*[\t ]*/)[0];
    var singleIndent = Array(indentSize + 1).join(indentCharacter);
    var indentLevel = 0;
    function indent() {
        indentLevel++;
        indentString += singleIndent;
    }
    function outdent() {
        indentLevel--;
        indentString = indentString.slice(0, -indentSize);
    }

    print = {}
    print["{"] = function(ch) {
        print.singleSpace();
        output.push(ch);
        print.newLine();
    }
    print["}"] = function(ch) {
        print.newLine();
        output.push(ch);
        print.newLine();
    }

    print.newLine = function(keepWhitespace) {
        if (!keepWhitespace)
            while (whiteRe.test(output[output.length - 1]))
                output.pop();

        if (output.length)
            output.push('\n');
        if (indentString)
            output.push(indentString);
    }
    print.singleSpace = function() {
        if (output.length && !whiteRe.test(output[output.length - 1]))
            output.push(' ');
    }
    var output = [];
    if (indentString)
        output.push(indentString);
    /*_____________________--------------------_____________________*/

    while(true) {
        var isAfterSpace = skipWhitespace();

        if (!ch)
            break;

        if (ch == '{') {
            indent();
            print["{"](ch);
        } else if (ch == '}') {
            outdent();
            print["}"](ch);
        } else if (ch == '"' || ch == '\'') {
            output.push(eatString(ch))
        } else if (ch == ';') {
            output.push(ch, '\n', indentString);
        } else if (ch == '/' && peek() == '*') { // comment
            print.newLine();
            output.push(eatComment(), "\n", indentString);
        } else if (ch == '(') { // may be a url
            output.push(ch);
            eatWhitespace();
            if (lookBack("url", -1) && next()) {
                if (ch != ')' && ch != '"' && ch != '\'')
                    output.push(eatString(')'));
                else
                    pos--;
            }
        } else if (ch == ')') {
            output.push(ch);
        } else if (ch == ',') {
            eatWhitespace();
            output.push(ch);
            print.singleSpace();
        } else if (ch == ']') {
            output.push(ch);
        }  else if (ch == '[' || ch == '=') { // no whitespace before or after
            eatWhitespace();
            output.push(ch);
        } else {
            if (isAfterSpace)
                print.singleSpace();

            output.push(ch);
        }
    }


    var sweetCode = output.join('').replace(/[\n ]+$/, '');
    return sweetCode;
}


if (typeof exports !== "undefined")
    exports.css_beautify = css_beautify;