eslint-plugin-regexp
Version:
ESLint plugin for finding RegExp mistakes and RegExp style guide violations.
88 lines (87 loc) • 3.04 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
const regexp_ast_analysis_1 = require("regexp-ast-analysis");
const utils_1 = require("../utils");
function isLookaround(node) {
return (node.type === "Assertion" &&
(node.kind === "lookahead" || node.kind === "lookbehind"));
}
function getTriviallyNestedAssertion(node) {
const alternatives = node.alternatives;
if (alternatives.length === 1) {
const elements = alternatives[0].elements;
if (elements.length === 1) {
const element = elements[0];
if (element.type === "Assertion") {
return element;
}
}
}
return null;
}
function getNegatedRaw(assertion) {
if (assertion.kind === "word") {
return assertion.negate ? "\\b" : "\\B";
}
else if (assertion.kind === "lookahead") {
return `(?${assertion.negate ? "=" : "!"}${assertion.raw.slice(3)}`;
}
else if (assertion.kind === "lookbehind") {
return `(?<${assertion.negate ? "=" : "!"}${assertion.raw.slice(4)}`;
}
return null;
}
exports.default = (0, utils_1.createRule)("no-trivially-nested-assertion", {
meta: {
docs: {
description: "disallow trivially nested assertions",
category: "Best Practices",
recommended: true,
},
fixable: "code",
schema: [],
messages: {
unexpected: "Unexpected trivially nested assertion.",
},
type: "suggestion",
},
create(context) {
function createVisitor({ node, fixReplaceNode, getRegexpLocation, }) {
return {
onAssertionEnter(aNode) {
if (aNode.parent.type === "Quantifier") {
return;
}
if (!isLookaround(aNode)) {
return;
}
const nested = getTriviallyNestedAssertion(aNode);
if (nested === null) {
return;
}
if (aNode.negate &&
isLookaround(nested) &&
nested.negate &&
(0, regexp_ast_analysis_1.hasSomeDescendant)(nested, (d) => d.type === "CapturingGroup")) {
return;
}
const replacement = aNode.negate
? getNegatedRaw(nested)
: nested.raw;
if (replacement === null) {
return;
}
context.report({
node,
loc: getRegexpLocation(aNode),
messageId: "unexpected",
fix: fixReplaceNode(aNode, replacement),
});
},
};
}
return (0, utils_1.defineRegexpVisitor)(context, {
createVisitor,
});
},
});