Utility method to format an xml string

formatXml.js

/*
    *  Utility method to format an xml string
    *  text : xml String
    *  step : no of spaces for indentation
    */
    formatXml : function(text,step) {

        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;
        }

        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) : createShiftArr('    '); // 4 spaces;

        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;
    }