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feat: add suggestions for redundant wrapping in prefer-regex-literals #16658

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merged 9 commits into from Jan 3, 2023
Merged

feat: add suggestions for redundant wrapping in prefer-regex-literals #16658

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df5bcf6
feat: add suggestions in prefer-regex-literals
yeonjuan Dec 11, 2022
5eb9f15
add tests & refactor
yeonjuan Dec 13, 2022
c8cf322
change test case
yeonjuan Dec 13, 2022
1a0074d
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yeonjuan Dec 15, 2022
44514f9
apply review and refactor
yeonjuan Dec 17, 2022
b1b6a57
refactor
yeonjuan Dec 17, 2022
9a673e3
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yeonjuan Dec 23, 2022
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yeonjuan Dec 27, 2022
3043c4c
add data
yeonjuan Dec 28, 2022
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114 changes: 103 additions & 11 deletions lib/rules/prefer-regex-literals.js
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Expand Up @@ -146,6 +146,7 @@ module.exports = {
messages: {
unexpectedRegExp: "Use a regular expression literal instead of the 'RegExp' constructor.",
replaceWithLiteral: "Replace with an equivalent regular expression literal.",
replaceWithLiteralAndFlags: "Replace with an equivalent regular expression literal with flags.",
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unexpectedRedundantRegExp: "Regular expression literal is unnecessarily wrapped within a 'RegExp' constructor.",
unexpectedRedundantRegExpWithFlags: "Use regular expression literal with flags instead of the 'RegExp' constructor."
}
Expand Down Expand Up @@ -258,6 +259,8 @@ module.exports = {
return Math.min(ecmaVersion, REGEXPP_LATEST_ECMA_VERSION);
}

const regexppEcmaVersion = getRegexppEcmaVersion(context.languageOptions.ecmaVersion);

/**
* Makes a character escaped or else returns null.
* @param {string} character The character to escape.
Expand Down Expand Up @@ -293,6 +296,52 @@ module.exports = {
}
}

/**
* Checks whether the given regex and flags are valid for the ecma version or not.
* @param {string} pattern The regex pattern to check.
* @param {string | undefined} flags The regex flags to check.
* @returns {boolean} True if the given regex pattern and flags are valid for the ecma version.
*/
function isValidRegexForEcmaVersion(pattern, flags) {
const validator = new RegExpValidator({ ecmaVersion: regexppEcmaVersion });

try {
validator.validatePattern(pattern, 0, pattern.length, flags ? flags.includes("u") : false);
if (flags) {
validator.validateFlags(flags);
}
return true;
} catch {
return false;
}
}

/**
* Checks whether two given regex flags contain the same flags or not.
* @param {string} flagsA The regex flags.
* @param {string} flagsB The regex flags.
* @returns {boolean} True if two regex flags contain same flags.
*/
function areFlagsEqual(flagsA, flagsB) {
return [...flagsA].sort().join("") === [...flagsB].sort().join("");
}


/**
* Merges two regex flags.
* @param {string} flagsA The regex flags.
* @param {string} flagsB The regex flags.
* @returns {string} The merged regex flags.
*/
function mergeRegexFlags(flagsA, flagsB) {
const flagsSet = new Set([
...flagsA,
...flagsB
]);

return [...flagsSet].join("");
}

return {
Program() {
const scope = context.getScope();
Expand All @@ -306,10 +355,61 @@ module.exports = {

for (const { node } of tracker.iterateGlobalReferences(traceMap)) {
if (disallowRedundantWrapping && isUnnecessarilyWrappedRegexLiteral(node)) {
const regexNode = node.arguments[0];

if (node.arguments.length === 2) {
context.report({ node, messageId: "unexpectedRedundantRegExpWithFlags" });
const outputs = [];

if (sourceCode.getCommentsInside(node).length === 0) {
const literalFlags = regexNode.regex.flags || "";
const argFlags = getStringValue(node.arguments[1]) || "";

if (isValidRegexForEcmaVersion(regexNode.regex.pattern, argFlags)) {
outputs.push(`/${regexNode.regex.pattern}/${argFlags}`);
}

if (literalFlags && argFlags) {
const mergedFlags = mergeRegexFlags(literalFlags, argFlags);

if (
!areFlagsEqual(mergedFlags, argFlags) &&
isValidRegexForEcmaVersion(regexNode.regex.pattern, mergedFlags)
) {
outputs.push(`/${regexNode.regex.pattern}/${mergedFlags}`);
}
}
}

context.report({
node,
messageId: "unexpectedRedundantRegExpWithFlags",
suggest: outputs.map(output => ({
messageId: "replaceWithLiteralAndFlags",
fix(fixer) {
return fixer.replaceText(node, output);
}
}))
});
} else {
context.report({ node, messageId: "unexpectedRedundantRegExp" });
const outputs = [];

if (
sourceCode.getCommentsInside(node).length === 0 &&
isValidRegexForEcmaVersion(regexNode.regex.pattern, regexNode.regex.flags)
) {
outputs.push(sourceCode.getText(regexNode));
}

context.report({
node,
messageId: "unexpectedRedundantRegExp",
suggest: outputs.map(output => ({
messageId: "replaceWithLiteral",
fix(fixer) {
return fixer.replaceText(node, output);
}
}))
});
}
} else if (hasOnlyStaticStringArguments(node)) {
let regexContent = getStringValue(node.arguments[0]);
Expand All @@ -320,15 +420,7 @@ module.exports = {
flags = getStringValue(node.arguments[1]);
}

const regexppEcmaVersion = getRegexppEcmaVersion(context.languageOptions.ecmaVersion);
const RegExpValidatorInstance = new RegExpValidator({ ecmaVersion: regexppEcmaVersion });

try {
RegExpValidatorInstance.validatePattern(regexContent, 0, regexContent.length, flags ? flags.includes("u") : false);
if (flags) {
RegExpValidatorInstance.validateFlags(flags);
}
} catch {
if (!isValidRegexForEcmaVersion(regexContent, flags)) {
noFix = true;
}

Expand Down