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