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Edit: cssbeautify.js

/*
 Copyright (C) 2012 Sencha Inc.
 Copyright (C) 2011 Sencha Inc.

Author: Ariya Hidayat.

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.
*/

/*jslint continue: true, indent: 4 */
/*global exports:true, module:true, window:true */

(function () {

'use strict';

function cssbeautify(style, opt) {

var options, index = 0, length = style.length, blocks, formatted = '',
            ch, ch2, str, state, State, depth, quote, comment,
            openbracesuffix = true,
            autosemicolon = false,
            trimRight;

options = arguments.length > 1 ? opt : {};
        if (typeof options.indent === 'undefined') {
            options.indent = '    ';
        }
        if (typeof options.openbrace === 'string') {
            openbracesuffix = (options.openbrace === 'end-of-line');
        }
        if (typeof options.autosemicolon === 'boolean') {
            autosemicolon = options.autosemicolon;
        }

function isWhitespace(c) {
            return (c === ' ') || (c === '\n') || (c === '\t') || (c === '\r') || (c === '\f');
        }

function isQuote(c) {
            return (c === '\'') || (c === '"');
        }

// FIXME: handle Unicode characters
        function isName(c) {
            return (ch >= 'a' && ch <= 'z') ||
                (ch >= 'A' && ch <= 'Z') ||
                (ch >= '0' && ch <= '9') ||
                '-_*.:#'.indexOf(c) >= 0;
        }

function appendIndent() {
            var i;
            for (i = depth; i > 0; i -= 1) {
                formatted += options.indent;
            }
        }

function closeBlock() {
            depth -= 1;
            formatted = trimRight(formatted);

if (autosemicolon) {
                if (formatted.charAt(formatted.length - 1) !== ';') {
                    formatted += ';';
                }
            }

formatted += '\n';
            appendIndent();
            formatted += '}';
            blocks.push(formatted);
            formatted = '';
        }

if (String.prototype.trimRight) {
            trimRight = function (s) {
                return s.trimRight();
            };
        } else {
            // old Internet Explorer
            trimRight = function (s) {
                return s.replace(/\s+$/, '');
            };
        }

State = {
            Start: 0,
            AtRule: 1,
            Block: 2,
            Selector: 3,
            Ruleset: 4,
            Property: 5,
            Separator: 6,
            Expression: 7,
            URL: 8
        };

depth = 0;
        state = State.Start;
        comment = false;
        blocks = [];

// We want to deal with LF (\n) only
        style = style.replace(/\r\n/g, '\n');

while (index < length) {
            ch = style.charAt(index);
            ch2 = style.charAt(index + 1);
            index += 1;

// Inside a string literal?
            if (isQuote(quote)) {
                formatted += ch;
                if (ch === quote) {
                    quote = null;
                }
                if (ch === '\\' && ch2 === quote) {
                    // Don't treat escaped character as the closing quote
                    formatted += ch2;
                    index += 1;
                }
                continue;
            }

// Starting a string literal?
            if (isQuote(ch)) {
                formatted += ch;
                quote = ch;
                continue;
            }

// Comment
            if (comment) {
                formatted += ch;
                if (ch === '*' && ch2 === '/') {
                    comment = false;
                    formatted += ch2;
                    index += 1;
                }
                continue;
            } else {
                if (ch === '/' && ch2 === '*') {
                    comment = true;
                    formatted += ch;
                    formatted += ch2;
                    index += 1;
                    continue;
                }
            }

if (state === State.Start) {

if (blocks.length === 0) {
                    if (isWhitespace(ch) && formatted.length === 0) {
                        continue;
                    }
                }

// Copy white spaces and control characters
                if (ch <= ' ' || ch.charCodeAt(0) >= 128) {
                    state = State.Start;
                    formatted += ch;
                    continue;
                }

// Selector or at-rule
                if (isName(ch) || (ch === '@')) {

// Clear trailing whitespaces and linefeeds.
                    str = trimRight(formatted);

if (str.length === 0) {
                        // If we have empty string after removing all the trailing
                        // spaces, that means we are right after a block.
                        // Ensure a blank line as the separator.
                        if (blocks.length > 0) {
                            formatted = '\n\n';
                        }
                    } else {
                        // After finishing a ruleset or directive statement,
                        // there should be one blank line.
                        if (str.charAt(str.length - 1) === '}' ||
                                str.charAt(str.length - 1) === ';') {

formatted = str + '\n\n';
                        } else {
                            // After block comment, keep all the linefeeds but
                            // start from the first column (remove whitespaces prefix).
                            while (true) {
                                ch2 = formatted.charAt(formatted.length - 1);
                                if (ch2 !== ' ' && ch2.charCodeAt(0) !== 9) {
                                    break;
                                }
                                formatted = formatted.substr(0, formatted.length - 1);
                            }
                        }
                    }
                    formatted += ch;
                    state = (ch === '@') ? State.AtRule : State.Selector;
                    continue;
                }
            }

if (state === State.AtRule) {

// ';' terminates a statement.
                if (ch === ';') {
                    formatted += ch;
                    state = State.Start;
                    continue;
                }

// '{' starts a block
                if (ch === '{') {
                    openBlock();
                    state = State.Block;
                    continue;
                }

formatted += ch;
                continue;
            }

if (state === State.Block) {

// Selector
                if (isName(ch)) {

// Clear trailing whitespaces and linefeeds.
                    str = trimRight(formatted);

if (str.length === 0) {
                        // If we have empty string after removing all the trailing
                        // spaces, that means we are right after a block.
                        // Ensure a blank line as the separator.
                        if (blocks.length > 0) {
                            formatted = '\n\n';
                        }
                    } else {
                        // Insert blank line if necessary.
                        if (str.charAt(str.length - 1) === '}') {
                            formatted = str + '\n\n';
                        } else {
                            // After block comment, keep all the linefeeds but
                            // start from the first column (remove whitespaces prefix).
                            while (true) {
                                ch2 = formatted.charAt(formatted.length - 1);
                                if (ch2 !== ' ' && ch2.charCodeAt(0) !== 9) {
                                    break;
                                }
                                formatted = formatted.substr(0, formatted.length - 1);
                            }
                        }
                    }

appendIndent();
                    formatted += ch;
                    state = State.Selector;
                    continue;
                }

// '}' resets the state.
                if (ch === '}') {
                    closeBlock();
                    state = State.Start;
                    continue;
                }

formatted += ch;
                continue;
            }

if (state === State.Selector) {

// '{' starts the ruleset.
                if (ch === '{') {
                    openBlock();
                    state = State.Ruleset;
                    continue;
                }

// '}' resets the state.
                if (ch === '}') {
                    closeBlock();
                    state = State.Start;
                    continue;
                }

formatted += ch;
                continue;
            }

if (state === State.Ruleset) {

// '}' finishes the ruleset.
                if (ch === '}') {
                    closeBlock();
                    state = State.Start;
                    if (depth > 0) {
                        state = State.Block;
                    }
                    continue;
                }

// Make sure there is no blank line or trailing spaces inbetween
                if (ch === '\n') {
                    formatted = trimRight(formatted);
                    formatted += '\n';
                    continue;
                }

// property name
                if (!isWhitespace(ch)) {
                    formatted = trimRight(formatted);
                    formatted += '\n';
                    appendIndent();
                    formatted += ch;
                    state = State.Property;
                    continue;
                }
                formatted += ch;
                continue;
            }

if (state === State.Property) {

// ':' concludes the property.
                if (ch === ':') {
                    formatted = trimRight(formatted);
                    formatted += ': ';
                    state = State.Expression;
                    if (isWhitespace(ch2)) {
                        state = State.Separator;
                    }
                    continue;
                }

formatted += ch;
                continue;
            }

if (state === State.Separator) {

// Non-whitespace starts the expression.
                if (!isWhitespace(ch)) {
                    formatted += ch;
                    state = State.Expression;
                    continue;
                }

// Anticipate string literal.
                if (isQuote(ch2)) {
                    state = State.Expression;
                }

continue;
            }

if (state === State.Expression) {

// ';' completes the declaration.
                if (ch === ';') {
                    formatted = trimRight(formatted);
                    formatted += ';\n';
                    state = State.Ruleset;
                    continue;
                }

formatted += ch;

if (ch === '(') {
                    if (formatted.charAt(formatted.length - 2) === 'l' &&
                            formatted.charAt(formatted.length - 3) === 'r' &&
                            formatted.charAt(formatted.length - 4) === 'u') {

// URL starts with '(' and closes with ')'.
                        state = State.URL;
                        continue;
                    }
                }

continue;
            }

if (state === State.URL) {

// ')' finishes the URL (only if it is not escaped).
                if (ch === ')' && formatted.charAt(formatted.length - 1 !== '\\')) {
                    formatted += ch;
                    state = State.Expression;
                    continue;
                }
            }

// The default action is to copy the character (to prevent
            // infinite loop).
            formatted += ch;
        }

formatted = blocks.join('') + formatted;

return formatted;
    }

if (typeof exports !== 'undefined') {
        // Node.js module.
        module.exports = exports = cssbeautify;
    } else if (typeof window === 'object') {
        // Browser loading.
        window.cssbeautify = cssbeautify;
    }

}());