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Utility method to format an xml string
/*
* 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;
}
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