mirror of
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101 lines
2.9 KiB
JavaScript
101 lines
2.9 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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"use strict";
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const { assert } = require("devtools/shared/DevToolsUtils");
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const { actions, diffingState } = require("../constants");
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const { immutableUpdate, snapshotIsDiffable } = require("../utils");
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const handlers = Object.create(null);
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handlers[actions.TOGGLE_DIFFING] = function (diffing, action) {
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if (diffing) {
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return null;
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}
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return Object.freeze({
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firstSnapshotId: null,
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secondSnapshotId: null,
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census: null,
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state: diffingState.SELECTING,
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});
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};
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handlers[actions.SELECT_SNAPSHOT_FOR_DIFFING] = function (diffing, { snapshot }) {
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assert(diffing,
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"Should never select a snapshot for diffing when we aren't diffing " +
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"anything");
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assert(diffing.state === diffingState.SELECTING,
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"Can't select when not in SELECTING state");
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assert(snapshotIsDiffable(snapshot),
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"snapshot must be in a diffable state");
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if (!diffing.firstSnapshotId) {
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return immutableUpdate(diffing, {
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firstSnapshotId: snapshot.id
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});
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}
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assert(!diffing.secondSnapshotId,
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"If we aren't selecting the first, then we must be selecting the " +
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"second");
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if (snapshot.id === diffing.firstSnapshotId) {
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// Ignore requests to select the same snapshot.
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return diffing;
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}
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return immutableUpdate(diffing, {
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secondSnapshotId: snapshot.id
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});
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};
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handlers[actions.TAKE_CENSUS_DIFF_START] = function (diffing, action) {
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assert(diffing, "Should be diffing when starting a census diff");
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assert(action.first.id === diffing.firstSnapshotId,
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"First snapshot's id should match");
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assert(action.second.id === diffing.secondSnapshotId,
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"Second snapshot's id should match");
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return immutableUpdate(diffing, {
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state: diffingState.TAKING_DIFF,
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census: {
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report: null,
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inverted: action.inverted,
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filter: action.filter,
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breakdown: action.breakdown,
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}
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});
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};
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handlers[actions.TAKE_CENSUS_DIFF_END] = function (diffing, action) {
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assert(diffing, "Should be diffing when ending a census diff");
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assert(action.first.id === diffing.firstSnapshotId,
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"First snapshot's id should match");
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assert(action.second.id === diffing.secondSnapshotId,
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"Second snapshot's id should match");
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return immutableUpdate(diffing, {
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state: diffingState.TOOK_DIFF,
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census: {
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report: action.report,
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inverted: action.inverted,
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filter: action.filter,
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breakdown: action.breakdown,
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}
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});
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};
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handlers[actions.DIFFFING_ERROR] = function (diffing, action) {
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return {
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state: diffingState.ERROR,
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error: action.error
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};
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};
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module.exports = function (diffing = null, action) {
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const handler = handlers[action.type];
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return handler ? handler(diffing, action) : diffing;
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};
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