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/**
* @fileoverview Disallow mixed spaces and tabs for indentation
* @author Jary Niebur
* @copyright 2014 Nicholas C. Zakas. All rights reserved.
* @copyright 2014 Jary Niebur. All rights reserved.
*/
"use strict";
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = function(context) {
var smartTabs;
switch (context.options[0]) {
case true: // Support old syntax, maybe add deprecation warning here
case "smart-tabs":
smartTabs = true;
break;
default:
smartTabs = false;
}
var COMMENT_START = /^\s*\/\*/,
MAYBE_COMMENT = /^\s*\*/;
//--------------------------------------------------------------------------
// Public
//--------------------------------------------------------------------------
return {
"Program": function(node) {
/*
* At least one space followed by a tab
* or the reverse before non-tab/-space
* characters begin.
*/
var regex = /^(?=[\t ]*(\t | \t))/,
match,
lines = context.getSourceLines();
if (smartTabs) {
/*
* At least one space followed by a tab
* before non-tab/-space characters begin.
*/
regex = /^(?=[\t ]* \t)/;
}
lines.forEach(function(line, i) {
match = regex.exec(line);
if (match) {
if (!MAYBE_COMMENT.test(line) && !COMMENT_START.test(lines[i - 1])) {
context.report(node, { line: i + 1, column: match.index + 1 }, "Mixed spaces and tabs.");
}
}
});
}
};
};
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