63 lines
2.0 KiB
JavaScript
63 lines
2.0 KiB
JavaScript
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'use strict';
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const jpescape = require('./jptr.js').jpescape;
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function defaultState() {
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return {
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path: '#',
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depth: 0,
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pkey: '',
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parent: {},
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payload: {},
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seen: new WeakMap(),
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identity: false,
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identityDetection: false
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};
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}
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/**
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* recurses through the properties of an object, given an optional starting state
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* anything you pass in state.payload is passed to the callback each time
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* @param object the object to recurse through
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* @param state optional starting state, can be set to null or {}
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* @param callback the function which receives object,key,state on each property
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*/
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function recurse(object, state, callback) {
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if (!state) state = {depth:0};
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if (!state.depth) {
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state = Object.assign({},defaultState(),state);
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}
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if (typeof object !== 'object') return;
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let oPath = state.path;
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for (let key in object) {
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state.key = key;
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state.path = state.path + '/' + encodeURIComponent(jpescape(key));
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state.identityPath = state.seen.get(object[key]);
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state.identity = (typeof state.identityPath !== 'undefined');
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if (object.hasOwnProperty(key)) {
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callback(object, key, state);
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}
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if ((typeof object[key] === 'object') && (!state.identity)) {
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if (state.identityDetection && !Array.isArray(object[key]) && object[key] !== null) {
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state.seen.set(object[key],state.path);
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}
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let newState = {};
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newState.parent = object;
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newState.path = state.path;
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newState.depth = state.depth ? state.depth+1 : 1;
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newState.pkey = key;
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newState.payload = state.payload;
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newState.seen = state.seen;
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newState.identity = false;
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newState.identityDetection = state.identityDetection;
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recurse(object[key], newState, callback);
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}
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state.path = oPath;
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}
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}
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module.exports = {
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recurse : recurse
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};
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