106 lines
3.4 KiB
JavaScript
106 lines
3.4 KiB
JavaScript
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/**
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* @fileoverview Rule to enforce a single linebreak style.
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* @author Erik Mueller
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*/
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"use strict";
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//------------------------------------------------------------------------------
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// Requirements
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//------------------------------------------------------------------------------
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const astUtils = require("./utils/ast-utils");
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//------------------------------------------------------------------------------
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// Rule Definition
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//------------------------------------------------------------------------------
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/** @type {import('../shared/types').Rule} */
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module.exports = {
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meta: {
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type: "layout",
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docs: {
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description: "Enforce consistent linebreak style",
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recommended: false,
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url: "https://eslint.org/docs/latest/rules/linebreak-style"
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},
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fixable: "whitespace",
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schema: [
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{
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enum: ["unix", "windows"]
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}
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],
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messages: {
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expectedLF: "Expected linebreaks to be 'LF' but found 'CRLF'.",
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expectedCRLF: "Expected linebreaks to be 'CRLF' but found 'LF'."
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}
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},
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create(context) {
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const sourceCode = context.sourceCode;
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//--------------------------------------------------------------------------
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// Helpers
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//--------------------------------------------------------------------------
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/**
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* Builds a fix function that replaces text at the specified range in the source text.
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* @param {int[]} range The range to replace
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* @param {string} text The text to insert.
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* @returns {Function} Fixer function
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* @private
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*/
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function createFix(range, text) {
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return function(fixer) {
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return fixer.replaceTextRange(range, text);
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};
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}
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//--------------------------------------------------------------------------
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// Public
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//--------------------------------------------------------------------------
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return {
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Program: function checkForLinebreakStyle(node) {
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const linebreakStyle = context.options[0] || "unix",
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expectedLF = linebreakStyle === "unix",
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expectedLFChars = expectedLF ? "\n" : "\r\n",
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source = sourceCode.getText(),
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pattern = astUtils.createGlobalLinebreakMatcher();
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let match;
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let i = 0;
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while ((match = pattern.exec(source)) !== null) {
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i++;
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if (match[0] === expectedLFChars) {
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continue;
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}
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const index = match.index;
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const range = [index, index + match[0].length];
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context.report({
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node,
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loc: {
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start: {
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line: i,
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column: sourceCode.lines[i - 1].length
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},
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end: {
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line: i + 1,
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column: 0
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}
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},
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messageId: expectedLF ? "expectedLF" : "expectedCRLF",
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fix: createFix(range, expectedLFChars)
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});
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}
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}
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};
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}
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};
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