A small, simple and powerful JavaScript plugin to beautify XML, JSON, CSS and SQL.

/**
 * vkBeautify - javascript plugin to pretty-print or minify text in XML, JSON, CSS and SQL formats.
 *
 * Version - 0.99.00.beta
 * Copyright (c) 2012 Vadim Kiryukhin
 * vkiryukhin @ gmail.com
 * http://www.eslinstructor.net/vkbeautify/
 *
 * MIT license:
 *   http://www.opensource.org/licenses/mit-license.php
 *
 *   Pretty print
 *
 *        vkbeautify.xml(text [,indent_pattern]);
 *        vkbeautify.json(text [,indent_pattern]);
 *        vkbeautify.css(text [,indent_pattern]);
 *        vkbeautify.sql(text [,indent_pattern]);
 *
 *        @text - String; text to beatufy;
 *        @indent_pattern - Integer | String;
 *                Integer:  number of white spaces;
 *                String:   character string to visualize indentation ( can also be a set of white spaces )
 *   Minify
 *
 *        vkbeautify.xmlmin(text [,preserve_comments]);
 *        vkbeautify.jsonmin(text);
 *        vkbeautify.cssmin(text [,preserve_comments]);
 *        vkbeautify.sqlmin(text);
 *
 *        @text - String; text to minify;
 *        @preserve_comments - Bool; [optional];
 *                Set this flag to true to prevent removing comments from @text ( minxml and mincss functions only. )
 *
 *   Examples:
 *        vkbeautify.xml(text); // pretty print XML
 *        vkbeautify.json(text, 4 ); // pretty print JSON
 *        vkbeautify.css(text, '. . . .'); // pretty print CSS
 *        vkbeautify.sql(text, '----'); // pretty print SQL
 *
 *        vkbeautify.xmlmin(text, true);// minify XML, preserve comments
 *        vkbeautify.jsonmin(text);// minify JSON
 *        vkbeautify.cssmin(text);// minify CSS, remove comments ( default )
 *        vkbeautify.sqlmin(text);// minify SQL
 *
 */

(function () {

    function createShiftArr(step) {

        var space = '    ';

        if (isNaN(parseInt(step))) { // argument is string
            space = step;
        } else { // argument is integer
            switch (step) {
            case 1:
                space = ' ';
                break;
            case 2:
                space = '  ';
                break;
            case 3:
                space = '   ';
                break;
            case 4:
                space = '    ';
                break;
            case 5:
                space = '     ';
                break;
            case 6:
                space = '      ';
                break;
            case 7:
                space = '       ';
                break;
            case 8:
                space = '        ';
                break;
            case 9:
                space = '         ';
                break;
            case 10:
                space = '          ';
                break;
            case 11:
                space = '           ';
                break;
            case 12:
                space = '            ';
                break;
            }
        }

        var shift = ['\n']; // array of shifts
        for (ix = 0; ix < 100; ix++) {
            shift.push(shift[ix] + space);
        }
        return shift;
    }

    function vkbeautify() {
        this.step = '\t'; // 4 spaces
        this.shift = createShiftArr(this.step);
    };

    vkbeautify.prototype.xml = function (text, step) {

        var ar = text.replace(/>\s{0,}</g, "><")
            .replace(/</g, "~::~<")
            .replace(/\s*xmlns\:/g, "~::~xmlns:")
            .replace(/\s*xmlns\=/g, "~::~xmlns=")
            .split('~::~'),
            len = ar.length,
            inComment = false,
            deep = 0,
            str = '',
            ix = 0,
            shift = step ? createShiftArr(step) : this.shift;

        for (ix = 0; ix < len; ix++) {
            // start comment or <![CDATA[...]]> or <!DOCTYPE //
            if (ar[ix].search(/<!/) > -1) {
                str += shift[deep] + ar[ix];
                inComment = true;
                // end comment  or <![CDATA[...]]> //
                if (ar[ix].search(/-->/) > -1 || ar[ix].search(/\]>/) > -1 || ar[ix].search(/!DOCTYPE/) > -1) {
                    inComment = false;
                }
            } else
                // end comment  or <![CDATA[...]]> //
                if (ar[ix].search(/-->/) > -1 || ar[ix].search(/\]>/) > -1) {
                    str += ar[ix];
                    inComment = false;
                } else
                    // <elm></elm> //
                    if (/^<\w/.exec(ar[ix - 1]) && /^<\/\w/.exec(ar[ix]) &&
                        /^<[\w:\-\.\,]+/.exec(ar[ix - 1]) == /^<\/[\w:\-\.\,]+/.exec(ar[ix])[0].replace('/', '')) {
                        str += ar[ix];
                        if (!inComment) deep--;
                    } else
                        // <elm> //
                        if (ar[ix].search(/<\w/) > -1 && ar[ix].search(/<\//) == -1 && ar[ix].search(/\/>/) == -1) {
                            str = !inComment ? str += shift[deep++] + ar[ix] : str += ar[ix];
                        } else
                            // <elm>...</elm> //
                            if (ar[ix].search(/<\w/) > -1 && ar[ix].search(/<\//) > -1) {
                                str = !inComment ? str += shift[deep] + ar[ix] : str += ar[ix];
                            } else
                                // </elm> //
                                if (ar[ix].search(/<\//) > -1) {
                                    str = !inComment ? str += shift[--deep] + ar[ix] : str += ar[ix];
                                } else
                                    // <elm/> //
                                    if (ar[ix].search(/\/>/) > -1) {
                                        str = !inComment ? str += shift[deep] + ar[ix] : str += ar[ix];
                                    } else
                                        // <? xml ... ?> //
                                        if (ar[ix].search(/<\?/) > -1) {
                                            str += shift[deep] + ar[ix];
                                        } else
                                            // xmlns //
                                            if (ar[ix].search(/xmlns\:/) > -1 || ar[ix].search(/xmlns\=/) > -1) {
                                                str += shift[deep] + ar[ix];
                                            }

            else {
                str += ar[ix];
            }
        }

        return (str[0] == '\n') ? str.slice(1) : str;
    }

    vkbeautify.prototype.json = function (text, step) {

        var step = step ? step : this.step;

        if (typeof JSON === 'undefined') return text;

        if (typeof text === "string") return JSON.stringify(JSON.parse(text), null, step);
        if (typeof text === "object") return JSON.stringify(text, null, step);

        return text; // text is not string nor object
    }

    vkbeautify.prototype.css = function (text, step) {

        var ar = text.replace(/\s{1,}/g, ' ')
            .replace(/\{/g, "{~::~")
            .replace(/\}/g, "~::~}~::~")
            .replace(/\;/g, ";~::~")
            .replace(/\/\*/g, "~::~/*")
            .replace(/\*\//g, "*/~::~")
            .replace(/~::~\s{0,}~::~/g, "~::~")
            .split('~::~'),
            len = ar.length,
            deep = 0,
            str = '',
            ix = 0,
            shift = step ? createShiftArr(step) : this.shift;

        for (ix = 0; ix < len; ix++) {

            if (/\{/.exec(ar[ix])) {
                str += shift[deep++] + ar[ix];
            } else
            if (/\}/.exec(ar[ix])) {
                str += shift[--deep] + ar[ix];
            } else
            if (/\*\\/.exec(ar[ix])) {
                str += shift[deep] + ar[ix];
            } else {
                str += shift[deep] + ar[ix];
            }
        }
        return str.replace(/^\n{1,}/, '');
    }

    //----------------------------------------------------------------------------

    function isSubquery(str, parenthesisLevel) {
        return parenthesisLevel - (str.replace(/\(/g, '').length - str.replace(/\)/g, '').length)
    }

    function split_sql(str, tab) {

        return str.replace(/\s{1,}/g, " ")

            .replace(/ AND /ig, "~::~" + tab + tab + "AND ")
            .replace(/ BETWEEN /ig, "~::~" + tab + "BETWEEN ")
            .replace(/ CASE /ig, "~::~" + tab + "CASE ")
            .replace(/ ELSE /ig, "~::~" + tab + "ELSE ")
            .replace(/ END /ig, "~::~" + tab + "END ")
            .replace(/ FROM /ig, "~::~FROM ")
            .replace(/ GROUP\s{1,}BY/ig, "~::~GROUP BY ")
            .replace(/ HAVING /ig, "~::~HAVING ")
            //.replace(/ SET /ig," SET~::~")
            .replace(/ IN /ig, " IN ")

            .replace(/ JOIN /ig, "~::~JOIN ")
            .replace(/ CROSS~::~{1,}JOIN /ig, "~::~CROSS JOIN ")
            .replace(/ INNER~::~{1,}JOIN /ig, "~::~INNER JOIN ")
            .replace(/ LEFT~::~{1,}JOIN /ig, "~::~LEFT JOIN ")
            .replace(/ RIGHT~::~{1,}JOIN /ig, "~::~RIGHT JOIN ")

            .replace(/ ON /ig, "~::~" + tab + "ON ")
            .replace(/ OR /ig, "~::~" + tab + tab + "OR ")
            .replace(/ ORDER\s{1,}BY/ig, "~::~ORDER BY ")
            .replace(/ OVER /ig, "~::~" + tab + "OVER ")

            .replace(/\(\s{0,}SELECT /ig, "~::~(SELECT ")
            .replace(/\)\s{0,}SELECT /ig, ")~::~SELECT ")

            .replace(/ THEN /ig, " THEN~::~" + tab + "")
            .replace(/ UNION /ig, "~::~UNION~::~")
            .replace(/ USING /ig, "~::~USING ")
            .replace(/ WHEN /ig, "~::~" + tab + "WHEN ")
            .replace(/ WHERE /ig, "~::~WHERE ")
            .replace(/ WITH /ig, "~::~WITH ")

            //.replace(/\,\s{0,}\(/ig,",~::~( ")
            //.replace(/\,/ig,",~::~"+tab+tab+"")

            .replace(/ ALL /ig, " ALL ")
            .replace(/ AS /ig, " AS ")
            .replace(/ ASC /ig, " ASC ")
            .replace(/ DESC /ig, " DESC ")
            .replace(/ DISTINCT /ig, " DISTINCT ")
            .replace(/ EXISTS /ig, " EXISTS ")
            .replace(/ NOT /ig, " NOT ")
            .replace(/ NULL /ig, " NULL ")
            .replace(/ LIKE /ig, " LIKE ")
            .replace(/\s{0,}SELECT /ig, "SELECT ")
            .replace(/\s{0,}UPDATE /ig, "UPDATE ")
            .replace(/ SET /ig, " SET ")

            .replace(/~::~{1,}/g, "~::~")
            .split('~::~');
    }

    vkbeautify.prototype.sql = function (text, step) {

        var ar_by_quote = text.replace(/\s{1,}/g, " ")
            .replace(/\'/ig, "~::~\'")
            .split('~::~'),
            len = ar_by_quote.length,
            ar = [],
            deep = 0,
            tab = this.step, //+this.step,
            inComment = true,
            inQuote = false,
            parenthesisLevel = 0,
            str = '',
            ix = 0,
            shift = step ? createShiftArr(step) : this.shift;;

        for (ix = 0; ix < len; ix++) {
            if (ix % 2) {
                ar = ar.concat(ar_by_quote[ix]);
            } else {
                ar = ar.concat(split_sql(ar_by_quote[ix], tab));
            }
        }

        len = ar.length;
        for (ix = 0; ix < len; ix++) {

            parenthesisLevel = isSubquery(ar[ix], parenthesisLevel);

            if (/\s{0,}\s{0,}SELECT\s{0,}/.exec(ar[ix])) {
                ar[ix] = ar[ix].replace(/\,/g, ",\n" + tab + tab + "")
            }

            if (/\s{0,}\s{0,}SET\s{0,}/.exec(ar[ix])) {
                ar[ix] = ar[ix].replace(/\,/g, ",\n" + tab + tab + "")
            }

            if (/\s{0,}\(\s{0,}SELECT\s{0,}/.exec(ar[ix])) {
                deep++;
                str += shift[deep] + ar[ix];
            } else
            if (/\'/.exec(ar[ix])) {
                if (parenthesisLevel < 1 && deep) {
                    deep--;
                }
                str += ar[ix];
            } else {
                str += shift[deep] + ar[ix];
                if (parenthesisLevel < 1 && deep) {
                    deep--;
                }
            }
            var junk = 0;
        }

        str = str.replace(/^\n{1,}/, '').replace(/\n{1,}/g, "\n");
        return str;
    }

    vkbeautify.prototype.xmlmin = function (text, preserveComments) {

        var str = preserveComments ? text :
            text.replace(/\<![ \r\n\t]*(--([^\-]|[\r\n]|-[^\-])*--[ \r\n\t]*)\>/g, "")
            .replace(/[ \r\n\t]{1,}xmlns/g, ' xmlns');
        return str.replace(/>\s{0,}</g, "><");
    }

    vkbeautify.prototype.jsonmin = function (text) {

        if (typeof JSON === 'undefined') return text;

        return JSON.stringify(JSON.parse(text), null, 0);

    }

    vkbeautify.prototype.cssmin = function (text, preserveComments) {

        var str = preserveComments ? text :
            text.replace(/\/\*([^*]|[\r\n]|(\*+([^*/]|[\r\n])))*\*+\//g, "");

        return str.replace(/\s{1,}/g, ' ')
            .replace(/\{\s{1,}/g, "{")
            .replace(/\}\s{1,}/g, "}")
            .replace(/\;\s{1,}/g, ";")
            .replace(/\/\*\s{1,}/g, "/*")
            .replace(/\*\/\s{1,}/g, "*/");
    }

    vkbeautify.prototype.sqlmin = function (text) {
        return text.replace(/\s{1,}/g, " ").replace(/\s{1,}\(/, "(").replace(/\s{1,}\)/, ")");
    }

    window.vkbeautify = new vkbeautify();
})();