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/**
* @fileoverview Rule to forbid control charactes from regular expressions.
* @author Nicholas C. Zakas
*/
"use strict";
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = {
meta: {
docs: {
description: "disallow control characters in regular expressions",
category: "Possible Errors",
recommended: true
},
schema: []
},
create(context) {
/**
* Get the regex expression
* @param {ASTNode} node node to evaluate
* @returns {*} Regex if found else null
* @private
*/
function getRegExp(node) {
if (node.value instanceof RegExp) {
return node.value;
}
if (typeof node.value === "string") {
const parent = context.getAncestors().pop();
if ((parent.type === "NewExpression" || parent.type === "CallExpression") &&
parent.callee.type === "Identifier" && parent.callee.name === "RegExp"
) {
// there could be an invalid regular expression string
try {
return new RegExp(node.value);
} catch (ex) {
return null;
}
}
}
return null;
}
const controlChar = /[\x00-\x1f]/g; // eslint-disable-line no-control-regex
const consecutiveSlashes = /\\+/g;
const consecutiveSlashesAtEnd = /\\+$/g;
const stringControlChar = /\\x[01][0-9a-f]/ig;
const stringControlCharWithoutSlash = /x[01][0-9a-f]/ig;
/**
* Return a list of the control characters in the given regex string
* @param {string} regexStr regex as string to check
* @returns {array} returns a list of found control characters on given string
* @private
*/
function getControlCharacters(regexStr) {
// check control characters, if RegExp object used
const controlChars = regexStr.match(controlChar) || [];
let stringControlChars = [];
// check substr, if regex literal used
const subStrIndex = regexStr.search(stringControlChar);
if (subStrIndex > -1) {
// is it escaped, check backslash count
const possibleEscapeCharacters = regexStr.slice(0, subStrIndex).match(consecutiveSlashesAtEnd);
const hasControlChars = possibleEscapeCharacters === null || !(possibleEscapeCharacters[0].length % 2);
if (hasControlChars) {
stringControlChars = regexStr.slice(subStrIndex, -1)
.split(consecutiveSlashes)
.filter(Boolean)
.map(x => {
const match = x.match(stringControlCharWithoutSlash) || [x];
return `\\${match[0]}`;
});
}
}
return controlChars.map(x => {
const hexCode = `0${x.charCodeAt(0).toString(16)}`.slice(-2);
return `\\x${hexCode}`;
}).concat(stringControlChars);
}
return {
Literal(node) {
const regex = getRegExp(node);
if (regex) {
const computedValue = regex.toString();
const controlCharacters = getControlCharacters(computedValue);
if (controlCharacters.length > 0) {
context.report({
node,
message: "Unexpected control character(s) in regular expression: {{controlChars}}.",
data: {
controlChars: controlCharacters.join(", ")
}
});
}
}
}
};
}
};
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