Function processSmartTabs

HTML/external/syntaxhighlighter_3.0.83/src/shCore.js:867–910

* Replaces tabs with smart spaces. * * @param {String} code Code to fix the tabs in. * @param {Number} tabSize Number of spaces in a column. * @return {String} Returns code with all tabs replaces with roper amount of spaces.

(code, tabSize)

 * @return {String}        Returns code with all tabs replaces with roper amount of spaces.
 */
function processSmartTabs(code, tabSize)
{
	var lines = splitLines(code),
		tab = '\t',
		spaces = ''
		;
	
	// Create a string with 1000 spaces to copy spaces from... 
	// It's assumed that there would be no indentation longer than that.
	for (var i = 0; i < 50; i++) 
		spaces += '                    '; // 20 spaces * 50
			
	// This function inserts specified amount of spaces in the string
	// where a tab is while removing that given tab.
	function insertSpaces(line, pos, count)
	{
		return line.substr(0, pos)
			+ spaces.substr(0, count)
			+ line.substr(pos + 1, line.length) // pos + 1 will get rid of the tab
			;
	};

	// Go through all the lines and do the 'smart tabs' magic.
	code = eachLine(code, function(line)
	{
		if (line.indexOf(tab) == -1) 
			return line;
		
		var pos = 0;
		
		while ((pos = line.indexOf(tab)) != -1) 
		{
			// This is pretty much all there is to the 'smart tabs' logic.
			// Based on the position within the line and size of a tab,
			// calculate the amount of spaces we need to insert.
			var spaces = tabSize - pos % tabSize;
			line = insertSpaces(line, pos, spaces);
		}
		
		return line;
	});
	
	return code;
};

/**
 * Performs various string fixes based on configuration.