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/**
* @fileoverview Rule to forbid control charactes from regular expressions.
* @author Nicholas C. Zakas
*/
"use strict";
const RegExpValidator = require("regexpp").RegExpValidator;
const collector = new (class {
constructor() {
this.ecmaVersion = 2018;
this._source = "";
this._controlChars = [];
this._validator = new RegExpValidator(this);
}
onPatternEnter() {
this._controlChars = [];
}
onCharacter(start, end, cp) {
if (cp >= 0x00 &&
cp <= 0x1F &&
(
this._source.codePointAt(start) === cp ||
this._source.slice(start, end).startsWith("\\x") ||
this._source.slice(start, end).startsWith("\\u")
)
) {
this._controlChars.push(`\\x${`0${cp.toString(16)}`.slice(-2)}`);
}
}
collectControlChars(regexpStr) {
try {
this._source = regexpStr;
this._validator.validatePattern(regexpStr); // Call onCharacter hook
} catch (err) {
// Ignore syntax errors in RegExp.
}
return this._controlChars;
}
})();
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = {
meta: {
type: "problem",
docs: {
description: "disallow control characters in regular expressions",
category: "Possible Errors",
recommended: true,
url: "https://eslint.org/docs/rules/no-control-regex"
},
schema: [],
messages: {
unexpected: "Unexpected control character(s) in regular expression: {{controlChars}}."
}
},
create(context) {
/**
* Get the regex expression
* @param {ASTNode} node node to evaluate
* @returns {RegExp|null} Regex if found else null
* @private
*/
function getRegExpPattern(node) {
if (node.regex) {
return node.regex.pattern;
}
if (typeof node.value === "string" &&
(node.parent.type === "NewExpression" || node.parent.type === "CallExpression") &&
node.parent.callee.type === "Identifier" &&
node.parent.callee.name === "RegExp" &&
node.parent.arguments[0] === node
) {
return node.value;
}
return null;
}
return {
Literal(node) {
const pattern = getRegExpPattern(node);
if (pattern) {
const controlCharacters = collector.collectControlChars(pattern);
if (controlCharacters.length > 0) {
context.report({
node,
messageId: "unexpected",
data: {
controlChars: controlCharacters.join(", ")
}
});
}
}
}
};
}
};