70 lines
2.5 KiB
JavaScript
70 lines
2.5 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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const utils_1 = require("../utils");
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exports.default = (0, utils_1.createRule)("no-extra-lookaround-assertions", {
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meta: {
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docs: {
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description: "disallow unnecessary nested lookaround assertions",
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category: "Best Practices",
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recommended: true,
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},
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fixable: "code",
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schema: [],
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messages: {
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canBeInlined: "This {{kind}} assertion is useless and can be inlined.",
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canBeConvertedIntoGroup: "This {{kind}} assertion is useless and can be converted into a group.",
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},
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type: "suggestion",
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},
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create(context) {
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function createVisitor(regexpContext) {
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return {
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onAssertionEnter(aNode) {
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if (aNode.kind === "lookahead" ||
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aNode.kind === "lookbehind") {
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verify(regexpContext, aNode);
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}
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},
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};
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}
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function verify(regexpContext, assertion) {
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for (const alternative of assertion.alternatives) {
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const nested = alternative.elements.at(assertion.kind === "lookahead"
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?
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-1
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:
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0);
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if ((nested === null || nested === void 0 ? void 0 : nested.type) === "Assertion" &&
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nested.kind === assertion.kind &&
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!nested.negate) {
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reportLookaroundAssertion(regexpContext, nested);
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}
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}
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}
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function reportLookaroundAssertion({ node, getRegexpLocation, fixReplaceNode }, assertion) {
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let messageId, replaceText;
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if (assertion.alternatives.length === 1) {
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messageId = "canBeInlined";
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replaceText = assertion.alternatives[0].raw;
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}
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else {
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messageId = "canBeConvertedIntoGroup";
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replaceText = `(?:${assertion.alternatives
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.map((alt) => alt.raw)
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.join("|")})`;
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}
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context.report({
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node,
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loc: getRegexpLocation(assertion),
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messageId,
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data: {
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kind: assertion.kind,
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},
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fix: fixReplaceNode(assertion, replaceText),
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});
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}
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return (0, utils_1.defineRegexpVisitor)(context, {
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createVisitor,
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});
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},
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});
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