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/**
* @fileoverview Rule to enforce a single linebreak style.
* @author Erik Mueller
* @copyright 2015 Varun Verma. All rights reserverd.
* @copyright 2015 James Whitney. All rights reserved.
* @copyright 2015 Erik Mueller. All rights reserved.
*/
"use strict";
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = function(context) {
var EXPECTED_LF_MSG = "Expected linebreaks to be 'LF' but found 'CRLF'.",
EXPECTED_CRLF_MSG = "Expected linebreaks to be 'CRLF' but found 'LF'.";
//--------------------------------------------------------------------------
// Helpers
//--------------------------------------------------------------------------
/**
* Builds a fix function that replaces text at the specified range in the source text.
* @param {int[]} range The range to replace
* @param {string} text The text to insert.
* @returns {function} Fixer function
* @private
*/
function createFix(range, text) {
return function(fixer) {
return fixer.replaceTextRange(range, text);
};
}
//--------------------------------------------------------------------------
// Public
//--------------------------------------------------------------------------
return {
"Program": function checkForlinebreakStyle(node) {
var linebreakStyle = context.options[0] || "unix",
expectedLF = linebreakStyle === "unix",
expectedLFChars = expectedLF ? "\n" : "\r\n",
source = context.getSource(),
pattern = /\r\n|\r|\n|\u2028|\u2029/g,
match,
index,
range;
var i = 0;
while ((match = pattern.exec(source)) !== null) {
i++;
if (match[0] === expectedLFChars) {
continue;
}
index = match.index;
range = [index, index + match[0].length];
context.report({
node: node,
loc: {
line: i,
column: context.getSourceLines()[i - 1].length
},
message: expectedLF ? EXPECTED_LF_MSG : EXPECTED_CRLF_MSG,
fix: createFix(range, expectedLFChars)
});
}
}
};
};
module.exports.schema = [
{
"enum": ["unix", "windows"]
}
];
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