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/**
* @fileoverview Rule to enforce requiring named capture groups in regular expression.
* @author Pig Fang <https://github.com/g-plane>
*/
"use strict";
//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------
const {
CALL,
CONSTRUCT,
ReferenceTracker,
getStringIfConstant
} = require("eslint-utils");
const regexpp = require("regexpp");
//------------------------------------------------------------------------------
// Helpers
//------------------------------------------------------------------------------
const parser = new regexpp.RegExpParser();
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = {
meta: {
type: "suggestion",
docs: {
description: "enforce using named capture group in regular expression",
category: "Best Practices",
recommended: false,
url: "https://eslint.org/docs/rules/prefer-named-capture-group"
},
schema: [],
messages: {
required: "Capture group '{{group}}' should be converted to a named or non-capturing group."
}
},
create(context) {
/**
* Function to check regular expression.
*
* @param {string} regex The regular expression to be check.
* @param {ASTNode} node AST node which contains regular expression.
* @param {boolean} uFlag Flag indicates whether unicode mode is enabled or not.
* @returns {void}
*/
function checkRegex(regex, node, uFlag) {
let ast;
try {
ast = parser.parsePattern(regex, 0, regex.length, uFlag);
} catch (_) {
// ignore regex syntax errors
return;
}
regexpp.visitRegExpAST(ast, {
onCapturingGroupEnter(group) {
if (!group.name) {
const locNode = node.type === "Literal" ? node : node.arguments[0];
context.report({
node,
messageId: "required",
loc: {
start: {
line: locNode.loc.start.line,
column: locNode.loc.start.column + group.start + 1
},
end: {
line: locNode.loc.start.line,
column: locNode.loc.start.column + group.end + 1
}
},
data: {
group: group.raw
}
});
}
}
});
}
return {
Literal(node) {
if (node.regex) {
checkRegex(node.regex.pattern, node, node.regex.flags.includes("u"));
}
},
Program() {
const scope = context.getScope();
const tracker = new ReferenceTracker(scope);
const traceMap = {
RegExp: {
[CALL]: true,
[CONSTRUCT]: true
}
};
for (const { node } of tracker.iterateGlobalReferences(traceMap)) {
const regex = getStringIfConstant(node.arguments[0]);
const flags = getStringIfConstant(node.arguments[1]);
if (regex) {
checkRegex(regex, node, flags && flags.includes("u"));
}
}
}
};
}
};