Update
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Douglas Barone
parent
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commit
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@ -1,15 +1,13 @@
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// https://github.com/douglascrockford/JSON-js/blob/master/cycle.js
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/*
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cycle.js
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2018-05-15
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2021-05-31
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Public Domain.
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NO WARRANTY EXPRESSED OR IMPLIED. USE AT YOUR OWN RISK.
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This code should be minified before deployment.
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See http://javascript.crockford.com/jsmin.html
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See https://www.crockford.com/jsmin.html
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USE YOUR OWN COPY. IT IS EXTREMELY UNWISE TO LOAD CODE FROM SERVERS YOU DO
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NOT CONTROL.
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@ -24,9 +22,9 @@
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retrocycle, set, stringify, test
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*/
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if (typeof JSON.decycle !== 'function') {
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if (typeof JSON.decycle !== "function") {
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JSON.decycle = function decycle(object, replacer) {
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'use strict'
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"use strict";
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// Make a deep copy of an object or array, assuring that there is at most
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// one instance of each object or array in the resulting structure. The
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@ -52,73 +50,77 @@ if (typeof JSON.decycle !== 'function') {
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// the object or array. [NUMBER] or [STRING] indicates a child element or
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// property.
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var objects = new WeakMap() // object to path mappings
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var objects = new WeakMap(); // object to path mappings
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return (function derez(value, path) {
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// The derez function recurses through the object, producing the deep copy.
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var old_path // The path of an earlier occurance of value
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var nu // The new object or array
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var old_path; // The path of an earlier occurance of value
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var nu; // The new object or array
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// If a replacer function was provided, then call it to get a replacement value.
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if (replacer !== undefined) {
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value = replacer(value)
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value = replacer(value);
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}
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// typeof null === "object", so go on if this value is really an object but not
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// one of the weird builtin objects.
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if (
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typeof value === 'object' &&
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value !== null &&
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!(value instanceof Boolean) &&
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!(value instanceof Date) &&
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!(value instanceof Number) &&
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!(value instanceof RegExp) &&
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!(value instanceof String)
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typeof value === "object"
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&& value !== null
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&& !(value instanceof Boolean)
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&& !(value instanceof Date)
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&& !(value instanceof Number)
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&& !(value instanceof RegExp)
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&& !(value instanceof String)
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) {
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// If the value is an object or array, look to see if we have already
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// encountered it. If so, return a {"$ref":PATH} object. This uses an
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// ES6 WeakMap.
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old_path = objects.get(value)
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old_path = objects.get(value);
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if (old_path !== undefined) {
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return { $ref: old_path }
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return { $ref: old_path };
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}
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// Otherwise, accumulate the unique value and its path.
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objects.set(value, path)
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objects.set(value, path);
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// If it is an array, replicate the array.
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if (Array.isArray(value)) {
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nu = []
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nu = [];
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value.forEach(function (element, i) {
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nu[i] = derez(element, path + '[' + i + ']')
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})
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nu[i] = derez(element, path + "[" + i + "]");
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});
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} else {
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// If it is an object, replicate the object.
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nu = {}
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nu = {};
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Object.keys(value).forEach(function (name) {
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nu[name] = derez(
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value[name],
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path + '[' + JSON.stringify(name) + ']'
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)
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})
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path + "[" + JSON.stringify(name) + "]"
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);
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});
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}
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return nu
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return nu;
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}
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return value
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})(object, '$')
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}
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return value;
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}(object, "$"));
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};
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}
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if (typeof JSON.retrocycle !== 'function') {
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if (typeof JSON.retrocycle !== "function") {
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JSON.retrocycle = function retrocycle($) {
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'use strict'
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"use strict";
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// Restore an object that was reduced by decycle. Members whose values are
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// objects of the form
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@ -139,41 +141,42 @@ if (typeof JSON.retrocycle !== 'function') {
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// return JSON.retrocycle(JSON.parse(s));
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// produces an array containing a single element which is the array itself.
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var px = /^\$(?:\[(?:\d+|"(?:[^\\"\u0000-\u001f]|\\(?:[\\"\/bfnrt]|u[0-9a-zA-Z]{4}))*")\])*$/
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var px = /^\$(?:\[(?:\d+|"(?:[^\\"\u0000-\u001f]|\\(?:[\\"\/bfnrt]|u[0-9a-zA-Z]{4}))*")\])*$/;
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(function rez(value) {
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;(function rez(value) {
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// The rez function walks recursively through the object looking for $ref
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// properties. When it finds one that has a value that is a path, then it
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// replaces the $ref object with a reference to the value that is found by
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// the path.
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if (value && typeof value === 'object') {
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if (value && typeof value === "object") {
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if (Array.isArray(value)) {
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value.forEach(function (element, i) {
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if (typeof element === 'object' && element !== null) {
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var path = element.$ref
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if (typeof path === 'string' && px.test(path)) {
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value[i] = eval(path)
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if (typeof element === "object" && element !== null) {
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var path = element.$ref;
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if (typeof path === "string" && px.test(path)) {
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value[i] = eval(path);
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} else {
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rez(element)
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rez(element);
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}
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}
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})
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});
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} else {
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Object.keys(value).forEach(function (name) {
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var item = value[name]
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if (typeof item === 'object' && item !== null) {
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var path = item.$ref
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if (typeof path === 'string' && px.test(path)) {
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value[name] = eval(path)
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var item = value[name];
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if (typeof item === "object" && item !== null) {
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var path = item.$ref;
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if (typeof path === "string" && px.test(path)) {
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value[name] = eval(path);
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} else {
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rez(item)
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rez(item);
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}
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}
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})
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});
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}
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}
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})($)
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return $
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}
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}
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}($));
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return $;
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};
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}
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