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/**
* @fileoverview Rule to enforce a single linebreak style.
* @author Erik Mueller
*/
"use strict";
//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------
const astUtils = require("../util/ast-utils");
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = {
meta: {
type: "layout",
docs: {
description: "enforce consistent linebreak style",
category: "Stylistic Issues",
recommended: false,
url: "https://eslint.org/docs/rules/linebreak-style"
},
fixable: "whitespace",
schema: [
{
enum: ["unix", "windows"]
}
],
messages: {
expectedLF: "Expected linebreaks to be 'LF' but found 'CRLF'.",
expectedCRLF: "Expected linebreaks to be 'CRLF' but found 'LF'."
}
},
create(context) {
const sourceCode = context.getSourceCode();
//--------------------------------------------------------------------------
// 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) {
const linebreakStyle = context.options[0] || "unix",
expectedLF = linebreakStyle === "unix",
expectedLFChars = expectedLF ? "\n" : "\r\n",
source = sourceCode.getText(),
pattern = astUtils.createGlobalLinebreakMatcher();
let match;
let i = 0;
while ((match = pattern.exec(source)) !== null) {
i++;
if (match[0] === expectedLFChars) {
continue;
}
const index = match.index;
const range = [index, index + match[0].length];
context.report({
node,
loc: {
line: i,
column: sourceCode.lines[i - 1].length
},
messageId: expectedLF ? "expectedLF" : "expectedCRLF",
fix: createFix(range, expectedLFChars)
});
}
}
};
}
};
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