stylus/beautify/beautify-css.js

/*jshint curly:true, eqeqeq:true, laxbreak:true, noempty:false */
/*

  The MIT License (MIT)

  Copyright (c) 2007-2013 Einar Lielmanis and contributors.

  Permission is hereby granted, free of charge, to any person
  obtaining a copy of this software and associated documentation files
  (the "Software"), to deal in the Software without restriction,
  including without limitation the rights to use, copy, modify, merge,
  publish, distribute, sublicense, and/or sell copies of the Software,
  and to permit persons to whom the Software is furnished to do so,
  subject to the following conditions:

  The above copyright notice and this permission notice shall be
  included in all copies or substantial portions of the Software.

  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  SOFTWARE.


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

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

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

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

    The options are (default in brackets):
        indent_size (4)                   — indentation size,
        indent_char (space)               — character to indent with,
        selector_separator_newline (true) - separate selectors with newline or
                                            not (e.g. "a,\nbr" or "a, br")
        end_with_newline (false)          - end with a newline
        newline_between_rules (true)      - add a new line after every css rule

    e.g

    css_beautify(css_source_text, {
      'indent_size': 1,
      'indent_char': '\t',
      'selector_separator': ' ',
      'end_with_newline': false,
      'newline_between_rules': true
    });
*/

// http://www.w3.org/TR/CSS21/syndata.html#tokenization
// http://www.w3.org/TR/css3-syntax/

(function() {
    function css_beautify(source_text, options) {
        function defaultOption(opt, defaultValue) {
            return opt === undefined ? defaultValue : opt;
        }
        options = options || {};
        var indentSize = options.indent_size || 4;
        var indentCharacter = options.indent_char || ' ';
        var selectorSeparatorNewline = defaultOption(options.selector_separator_newline, true);
        var end_with_newline = defaultOption(options.end_with_newline, false);
        var newline_between_rules = defaultOption(options.newline_between_rules, true);
        var newline_between_properties = defaultOption(options.newline_between_properties, true);
        var newline_before_open_brace = defaultOption(options.newline_before_open_brace, false);
        var newline_after_open_brace = defaultOption(options.newline_after_open_brace, true);
        var newline_before_close_brace = defaultOption(options.newline_before_close_brace, true);

        // compatibility
        if (typeof indentSize === "string") {
            indentSize = parseInt(indentSize, 10);
        }


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

        var pos = -1,
            ch;
        var parenLevel = 0;

        function next() {
            ch = source_text.charAt(++pos);
            return ch || '';
        }

        function peek(skipWhitespace) {
            var prev_pos = pos;
            if (skipWhitespace) {
                eatWhitespace();
            }
            result = source_text.charAt(pos + 1) || '';
            pos = prev_pos - 1;
            next();
            return result;
        }

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

        function peekString(endChar) {
            var prev_pos = pos;
            var str = eatString(endChar);
            pos = prev_pos - 1;
            next();
            return str;
        }

        function eatWhitespace() {
            var result = '';
            while (whiteRe.test(peek())) {
                next();
                result += ch;
            }
            return result;
        }

        function skipWhitespace() {
            var result = '';
            if (ch && whiteRe.test(ch)) {
                result = ch;
            }
            while (whiteRe.test(next())) {
                result += ch;
            }
            return result;
        }

        function eatComment(singleLine) {
            var start = pos;
            singleLine = peek() === "/";
            next();
            while (next()) {
                if (!singleLine && ch === "*" && peek() === "/") {
                    next();
                    break;
                } else if (singleLine && ch === "\n") {
                    return source_text.substring(start, pos);
                }
            }

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


        function lookBack(str) {
            return source_text.substring(pos - str.length, pos).toLowerCase() ===
                str;
        }

        // Nested pseudo-class if we are insideRule
        // and the next special character found opens
        // a new block
        function foundNestedPseudoClass() {
            for (var i = pos + 1; i < source_text.length; i++) {
                var ch = source_text.charAt(i);
                if (ch === "{") {
                    return true;
                } else if (ch === ";" || ch === "}" || ch === ")") {
                    return false;
                }
            }
            return false;
        }

        // printer
        var basebaseIndentString = source_text.match(/^[\t ]*/)[0];
        var singleIndent = new Array(indentSize + 1).join(indentCharacter);
        var indentLevel = 0;
        var nestedLevel = 0;

        function indent() {
            indentLevel++;
            basebaseIndentString += singleIndent;
        }

        function outdent() {
            indentLevel--;
            basebaseIndentString = basebaseIndentString.slice(0, -indentSize);
        }

        var print = {};
        print["{"] = function(ch) {
            newline_before_open_brace ? output.push('\n') : print.singleSpace();
            output.push(ch);
            newline_after_open_brace ? print.newLine() : print.singleSpace();
        };
        print["}"] = function(ch) {
            newline_before_close_brace ? print.newLine() : print.singleSpace();
            output.push(ch);
            print.newLine();
        };

        print._lastCharWhitespace = function() {
            return whiteRe.test(output[output.length - 1]);
        };

        print.newLine = function(keepWhitespace) {
            if (!keepWhitespace) {
                print.trim();
            }

            if (output.length) {
                output.push('\n');
            }
            if (basebaseIndentString) {
                output.push(basebaseIndentString);
            }
        };
        print.singleSpace = function() {
            if (output.length && !print._lastCharWhitespace()) {
                output.push(' ');
            }
        };

        print.trim = function() {
            while (print._lastCharWhitespace()) {
                output.pop();
            }
        };


        var output = [];
        if (basebaseIndentString) {
            output.push(basebaseIndentString);
        }
        /*_____________________--------------------_____________________*/

        var insideRule = false;
        var enteringConditionalGroup = false;
        var top_ch = '';
        var last_top_ch = '';

        while (true) {
            var whitespace = skipWhitespace();
            var isAfterSpace = whitespace !== '';
            var isAfterNewline = whitespace.indexOf('\n') !== -1;
            last_top_ch = top_ch;
            top_ch = ch;

            if (!ch) {
                break;
            } else if (ch === '/' && peek() === '*') { /* css comment */
                var header = lookBack("");
                print.newLine();
                output.push(eatComment());
                print.newLine();
                if (header) {
                    print.newLine(true);
                }
            } else if (ch === '/' && peek() === '/') { // single line comment
                if (!isAfterNewline && last_top_ch !== '{') {
                    print.trim();
                }
                print.singleSpace();
                output.push(eatComment());
                print.newLine();
            } else if (ch === '@') {
                // pass along the space we found as a separate item
                if (isAfterSpace) {
                    print.singleSpace();
                }
                output.push(ch);

                // strip trailing space, if present, for hash property checks
                var variableOrRule = peekString(": ,;{}()[]/='\"");

                if (variableOrRule.match(/[ :]$/)) {
                    // we have a variable or pseudo-class, add it and insert one space before continuing
                    next();
                    variableOrRule = eatString(": ").replace(/\s$/, '');
                    output.push(variableOrRule);
                    print.singleSpace();
                }

                variableOrRule = variableOrRule.replace(/\s$/, '')

                // might be a nesting at-rule
                if (variableOrRule in css_beautify.NESTED_AT_RULE) {
                    nestedLevel += 1;
                    if (variableOrRule in css_beautify.CONDITIONAL_GROUP_RULE) {
                        enteringConditionalGroup = true;
                    }
                }
            } else if (ch === '{') {
                if (peek(true) === '}') {
                    eatWhitespace();
                    next();
                    print.singleSpace();
                    output.push("{}");
                    print.newLine();
                    if (newline_between_rules && indentLevel === 0) {
                        print.newLine(true);
                    }
                } else {
                    indent();
                    print["{"](ch);
                    // when entering conditional groups, only rulesets are allowed
                    if (enteringConditionalGroup) {
                        enteringConditionalGroup = false;
                        insideRule = (indentLevel > nestedLevel);
                    } else {
                        // otherwise, declarations are also allowed
                        insideRule = (indentLevel >= nestedLevel);
                    }
                }
            } else if (ch === '}') {
                outdent();
                print["}"](ch);
                insideRule = false;
                if (nestedLevel) {
                    nestedLevel--;
                }
                if (newline_between_rules && indentLevel === 0) {
                    print.newLine(true);
                }
            } else if (ch === ":") {
                eatWhitespace();
                if ((insideRule || enteringConditionalGroup) &&
                    !(lookBack("&") || foundNestedPseudoClass())) {
                    // 'property: value' delimiter
                    // which could be in a conditional group query
                    output.push(':');
                    print.singleSpace();
                } else {
                    // sass/less parent reference don't use a space
                    // sass nested pseudo-class don't use a space
                    if (peek() === ":") {
                        // pseudo-element
                        next();
                        output.push("::");
                    } else {
                        // pseudo-class
                        output.push(':');
                    }
                }
            } else if (ch === '"' || ch === '\'') {
                if (isAfterSpace) {
                    print.singleSpace();
                }
                output.push(eatString(ch));
            } else if (ch === ';') {
                output.push(ch);
                newline_between_properties ? print.newLine() : print.singleSpace();
            } else if (ch === '(') { // may be a url
                if (lookBack("url")) {
                    output.push(ch);
                    eatWhitespace();
                    if (next()) {
                        if (ch !== ')' && ch !== '"' && ch !== '\'') {
                            output.push(eatString(')'));
                        } else {
                            pos--;
                        }
                    }
                } else {
                    parenLevel++;
                    if (isAfterSpace) {
                        print.singleSpace();
                    }
                    output.push(ch);
                    eatWhitespace();
                }
            } else if (ch === ')') {
                output.push(ch);
                parenLevel--;
            } else if (ch === ',') {
                output.push(ch);
                eatWhitespace();
                if (!insideRule && selectorSeparatorNewline && parenLevel < 1) {
                    print.newLine();
                } else {
                    print.singleSpace();
                }
            } else if (ch === ']') {
                output.push(ch);
            } else if (ch === '[') {
                if (isAfterSpace) {
                    print.singleSpace();
                }
                output.push(ch);
            } else if (ch === '=') { // no whitespace before or after
                eatWhitespace()
                ch = '=';
                output.push(ch);
            } else {
                if (isAfterSpace) {
                    print.singleSpace();
                }

                output.push(ch);
            }
        }


        var sweetCode = output.join('').replace(/[\r\n\t ]+$/, '');

        // establish end_with_newline
        if (end_with_newline) {
            sweetCode += "\n";
        }

        return sweetCode;
    }

    // https://developer.mozilla.org/en-US/docs/Web/CSS/At-rule
    css_beautify.NESTED_AT_RULE = {
        "@page": true,
        "@font-face": true,
        "@keyframes": true,
        // also in CONDITIONAL_GROUP_RULE below
        "@media": true,
        "@supports": true,
        "@document": true
    };
    css_beautify.CONDITIONAL_GROUP_RULE = {
        "@media": true,
        "@supports": true,
        "@document": true
    };

    /*global define */
    if (typeof define === "function" && define.amd) {
        // Add support for AMD ( https://github.com/amdjs/amdjs-api/wiki/AMD#defineamd-property- )
        define([], function() {
            return {
                css_beautify: css_beautify
            };
        });
    } else if (typeof exports !== "undefined") {
        // Add support for CommonJS. Just put this file somewhere on your require.paths
        // and you will be able to `var html_beautify = require("beautify").html_beautify`.
        exports.css_beautify = css_beautify;
    } else if (typeof window !== "undefined") {
        // If we're running a web page and don't have either of the above, add our one global
        window.css_beautify = css_beautify;
    } else if (typeof global !== "undefined") {
        // If we don't even have window, try global.
        global.css_beautify = css_beautify;
    }

}());