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113 lines
3.8 KiB
JavaScript
113 lines
3.8 KiB
JavaScript
/**
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* @fileoverview Require or disallow newline at the end of files
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* @author Nodeca Team <https://github.com/nodeca>
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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 lodash = require("lodash");
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//------------------------------------------------------------------------------
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// Rule Definition
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//------------------------------------------------------------------------------
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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: "require or disallow newline at the end of files",
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category: "Stylistic Issues",
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recommended: false,
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url: "https://eslint.org/docs/rules/eol-last"
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},
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fixable: "whitespace",
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schema: [
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{
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enum: ["always", "never", "unix", "windows"]
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}
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],
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messages: {
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missing: "Newline required at end of file but not found.",
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unexpected: "Newline not allowed at end of file."
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}
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},
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create(context) {
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//--------------------------------------------------------------------------
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// Public
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//--------------------------------------------------------------------------
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return {
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Program: function checkBadEOF(node) {
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const sourceCode = context.getSourceCode(),
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src = sourceCode.getText(),
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location = {
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column: lodash.last(sourceCode.lines).length,
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line: sourceCode.lines.length
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},
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LF = "\n",
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CRLF = `\r${LF}`,
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endsWithNewline = lodash.endsWith(src, LF);
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/*
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* Empty source is always valid: No content in file so we don't
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* need to lint for a newline on the last line of content.
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*/
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if (!src.length) {
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return;
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}
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let mode = context.options[0] || "always",
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appendCRLF = false;
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if (mode === "unix") {
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// `"unix"` should behave exactly as `"always"`
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mode = "always";
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}
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if (mode === "windows") {
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// `"windows"` should behave exactly as `"always"`, but append CRLF in the fixer for backwards compatibility
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mode = "always";
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appendCRLF = true;
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}
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if (mode === "always" && !endsWithNewline) {
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// File is not newline-terminated, but should be
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context.report({
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node,
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loc: location,
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messageId: "missing",
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fix(fixer) {
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return fixer.insertTextAfterRange([0, src.length], appendCRLF ? CRLF : LF);
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}
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});
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} else if (mode === "never" && endsWithNewline) {
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// File is newline-terminated, but shouldn't be
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context.report({
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node,
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loc: location,
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messageId: "unexpected",
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fix(fixer) {
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const finalEOLs = /(?:\r?\n)+$/u,
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match = finalEOLs.exec(sourceCode.text),
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start = match.index,
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end = sourceCode.text.length;
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return fixer.replaceTextRange([start, end], "");
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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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};
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