tor-browser

dom-mutation-breakpoints.js (3789B)

---

/* 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/>. */
"use strict";

const initialReducerState = {
 counter: 1,
 breakpoints: [],
};

exports.reducer = domMutationBreakpointReducer;
function domMutationBreakpointReducer(state = initialReducerState, action) {
 switch (action.type) {
   case "ADD_DOM_MUTATION_BREAKPOINT": {
     const hasExistingBp = state.breakpoints.some(
       bp =>
         bp.nodeFront === action.nodeFront &&
         bp.mutationType === action.mutationType
     );

     if (hasExistingBp) {
       break;
     }

     state = {
       ...state,
       counter: state.counter + 1,
       breakpoints: [
         ...state.breakpoints,
         {
           id: `${state.counter}`,
           nodeFront: action.nodeFront,
           targetFront: action.nodeFront.targetFront,
           mutationType: action.mutationType,
           enabled: true,
         },
       ],
     };
     break;
   }
   case "REMOVE_DOM_MUTATION_BREAKPOINT":
     for (const [index, bp] of state.breakpoints.entries()) {
       if (
         bp.nodeFront === action.nodeFront &&
         bp.mutationType === action.mutationType
       ) {
         state = {
           ...state,
           breakpoints: [
             ...state.breakpoints.slice(0, index),
             ...state.breakpoints.slice(index + 1),
           ],
         };
         break;
       }
     }
     break;
   case "REMOVE_DOM_MUTATION_BREAKPOINTS_FOR_FRONTS": {
     const { nodeFronts } = action;
     const nodeFrontSet = new Set(nodeFronts);

     const breakpoints = state.breakpoints.filter(
       bp => !nodeFrontSet.has(bp.nodeFront)
     );

     // Since we might not have made any actual changes, we verify first
     // to avoid unnecessary changes in the state.
     if (state.breakpoints.length !== breakpoints.length) {
       state = {
         ...state,
         breakpoints,
       };
     }
     break;
   }

   case "REMOVE_TARGET": {
     const { targetFront } = action;
     // When a target is destroyed, remove breakpoints associated with it.
     const breakpoints = state.breakpoints.filter(
       bp => bp.targetFront !== targetFront
     );

     // Since we might not have made any actual changes, we verify first
     // to avoid unnecessary changes in the state.
     if (state.breakpoints.length !== breakpoints.length) {
       state = {
         ...state,
         breakpoints,
       };
     }
     break;
   }

   case "SET_DOM_MUTATION_BREAKPOINTS_ENABLED_STATE": {
     const { enabledStates } = action;
     const toUpdateById = new Map(enabledStates);

     const breakpoints = state.breakpoints.map(bp => {
       const newBpState = toUpdateById.get(bp.id);
       if (typeof newBpState === "boolean" && newBpState !== bp.enabled) {
         bp = {
           ...bp,
           enabled: newBpState,
         };
       }

       return bp;
     });

     // Since we might not have made any actual changes, we verify first
     // to avoid unnecessary changes in the state.
     if (state.breakpoints.some((bp, i) => breakpoints[i] !== bp)) {
       state = {
         ...state,
         breakpoints,
       };
     }
     break;
   }
 }
 return state;
}

exports.getDOMMutationBreakpoints = getDOMMutationBreakpoints;
function getDOMMutationBreakpoints(state) {
 return state.domMutationBreakpoints.breakpoints;
}

exports.getDOMMutationBreakpoint = getDOMMutationBreakpoint;
function getDOMMutationBreakpoint(state, id) {
 return (
   state.domMutationBreakpoints.breakpoints.find(v => v.id === id) || null
 );
}