stylint/src/checks/mixed.js

A linter for stylus

'use strict';

var
	tabs  = /\t/,       // was a tab used, at all
	spaces = /(  )+/;  // check for 2 or more spaces (if hard tabs, shouldn't find anything)

/**
 * check for mixed spaces and tabs
 * @param  {string} line  the line being tested
 * @param  {number} indentSpaces  default is 4. if set to false the we do hard tabs instead of spaces
 * @return {boolean} true if mixed spaces and tabs, false if not
 * @todo  this is kinda not 100% reliable in it's current form
 */
module.exports = function checkMixedSpacesAndTabs( line, arr, indentSpaces ) {
	if ( typeof line !== 'string' || typeof indentSpaces === 'undefined' ) { return; }

	// if this isnt set to false then we're indenting with spaces
	if ( typeof indentSpaces === 'number' ) {
		// look for hard tabs
		if ( tabs.test( line ) ) {
			return true;
		}
		// soft tabs, no hard tabs, all good
		else {
			return false;
		}
	}
	// else you're a hard tab believer
	else {
		// look for 2 or more spaces
		if ( spaces.test( line ) ) {
			return true;
		}
		// hard tab, no spaces, all good
		else {
			return false;
		}
	}
};