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scopes.js
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52 lines (40 loc) · 1.27 KB
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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 toPairs from "lodash/toPairs";
import uniq from "lodash/uniq";
import type { Scope } from "./types";
function getScopeVariables(scope: Scope) {
const { bindings } = scope;
return toPairs(bindings).map(([name, binding]) => ({
name,
references: binding.referencePaths
}));
}
function getScopeChain(scope: Scope): Scope[] {
const scopes = [];
do {
scopes.push(scope);
} while ((scope = scope.parent));
return scopes;
}
export function getVariablesInLocalScope(scope: Scope) {
return getScopeVariables(scope);
}
export function getVariablesInScope(scope: Scope) {
const scopes = getScopeChain(scope);
const scopeVars = scopes.map(getScopeVariables);
const vars = [{ name: "this" }, { name: "arguments" }]
.concat(...scopeVars)
.map(variable => variable.name);
return uniq(vars);
}
export function isExpressionInScope(expression: string, scope?: Scope) {
if (!scope) {
return false;
}
const variables = getVariablesInScope(scope);
const firstPart = expression.split(/\./)[0];
return variables.includes(firstPart);
}