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utils.js
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53 lines (43 loc) · 1.5 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 type { Why } from "../../../types";
import type { NamedValue } from "./types";
export function getFramePopVariables(why: Why, path: string): NamedValue[] {
const vars: Array<NamedValue> = [];
if (why && why.frameFinished) {
const frameFinished = why.frameFinished;
// Always display a `throw` property if present, even if it is falsy.
if (Object.prototype.hasOwnProperty.call(frameFinished, "throw")) {
vars.push({
name: "<exception>",
path: `${path}/<exception>`,
contents: { value: frameFinished.throw }
});
}
if (Object.prototype.hasOwnProperty.call(frameFinished, "return")) {
const returned = frameFinished.return;
// Do not display undefined. Do display falsy values like 0 and false. The
// protocol grip for undefined is a JSON object: { type: "undefined" }.
if (typeof returned !== "object" || returned.type !== "undefined") {
vars.push({
name: "<return>",
path: `${path}/<return>`,
contents: { value: returned }
});
}
}
}
return vars;
}
export function getThisVariable(this_: any, path: string): ?NamedValue {
if (!this_) {
return null;
}
return {
name: "<this>",
path: `${path}/<this>`,
contents: { value: this_ }
};
}