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getScopes.js
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32 lines (26 loc) · 1008 Bytes
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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
// @flow
import { traverseAst } from "./utils/ast";
import { getSource } from "./sources";
import {
createParseJSScopeVisitor,
findScopes
} from "devtools-map-bindings/src/parser";
import type { Location, SourceScope } from "debugger-html";
let parsedScopesCache = new Map();
export default function getScopes(location: Location): SourceScope[] {
const { sourceId } = location;
let parsedScopes = parsedScopesCache.get(sourceId);
if (!parsedScopes) {
const visitor = createParseJSScopeVisitor(sourceId);
traverseAst(getSource(sourceId), visitor.traverseVisitor);
parsedScopes = visitor.toParsedScopes();
parsedScopesCache.set(sourceId, parsedScopes);
}
return findScopes(parsedScopes, location);
}
export function clearScopes() {
parsedScopesCache = new Map();
}