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stepping.js
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47 lines (36 loc) · 1.46 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 { isEqual } from "lodash";
import { isGeneratedId, isOriginalId } from "devtools-source-map";
import type { Frame, MappedLocation } from "../../types";
import type { State } from "../../reducers/types";
import {
getSelectedSource,
getPreviousPauseFrameLocation,
getPausePoint
} from "../../selectors";
function getFrameLocation(source, frame: ?MappedLocation) {
if (!frame) {
return null;
}
return isOriginalId(source.id) ? frame.location : frame.generatedLocation;
}
export function shouldStep(rootFrame: ?Frame, state: State, sourceMaps: any) {
const selectedSource = getSelectedSource(state);
const previousFrameInfo = getPreviousPauseFrameLocation(state);
if (!rootFrame || !selectedSource) {
return false;
}
const previousFrameLoc = getFrameLocation(selectedSource, previousFrameInfo);
const frameLoc = getFrameLocation(selectedSource, rootFrame);
const sameLocation = previousFrameLoc && isEqual(previousFrameLoc, frameLoc);
const pausePoint = getPausePoint(state, frameLoc);
const invalidPauseLocation = pausePoint && !pausePoint.step;
// We always want to pause in generated locations
if (!frameLoc || isGeneratedId(frameLoc.sourceId)) {
return false;
}
return sameLocation || invalidPauseLocation;
}