87 lines
3 KiB
JavaScript
87 lines
3 KiB
JavaScript
"use strict";
|
|
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,
|
|
});
|
|
},
|
|
});
|