no-octal-escape.js•1.48 kB
/**
* @fileoverview Rule to flag octal escape sequences in string literals.
* @author Ian Christian Myers
*/
"use strict";
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
/** @type {import('../shared/types').Rule} */
module.exports = {
meta: {
type: "suggestion",
docs: {
description: "Disallow octal escape sequences in string literals",
recommended: false,
url: "https://eslint.org/docs/latest/rules/no-octal-escape"
},
schema: [],
messages: {
octalEscapeSequence: "Don't use octal: '\\{{sequence}}'. Use '\\u....' instead."
}
},
create(context) {
return {
Literal(node) {
if (typeof node.value !== "string") {
return;
}
// \0 represents a valid NULL character if it isn't followed by a digit.
const match = node.raw.match(
/^(?:[^\\]|\\.)*?\\([0-3][0-7]{1,2}|[4-7][0-7]|0(?=[89])|[1-7])/su
);
if (match) {
context.report({
node,
messageId: "octalEscapeSequence",
data: { sequence: match[1] }
});
}
}
};
}
};