@apollo/client/cache/inmemory/object-canon.js

A fully-featured caching GraphQL client.

import { __assign } from "tslib";
import "../../utilities/globals/index.js";
import { Trie } from "@wry/trie";
import { canUseWeakMap, canUseWeakSet, isNonNullObject as isObjectOrArray, } from "../../utilities/index.js";
import { isArray } from "./helpers.js";
function shallowCopy(value) {
    if (isObjectOrArray(value)) {
        return isArray(value)
            ? value.slice(0)
            : __assign({ __proto__: Object.getPrototypeOf(value) }, value);
    }
    return value;
}
var ObjectCanon = (function () {
    function ObjectCanon() {
        this.known = new (canUseWeakSet ? WeakSet : Set)();
        this.pool = new Trie(canUseWeakMap);
        this.passes = new WeakMap();
        this.keysByJSON = new Map();
        this.empty = this.admit({});
    }
    ObjectCanon.prototype.isKnown = function (value) {
        return isObjectOrArray(value) && this.known.has(value);
    };
    ObjectCanon.prototype.pass = function (value) {
        if (isObjectOrArray(value)) {
            var copy = shallowCopy(value);
            this.passes.set(copy, value);
            return copy;
        }
        return value;
    };
    ObjectCanon.prototype.admit = function (value) {
        var _this = this;
        if (isObjectOrArray(value)) {
            var original = this.passes.get(value);
            if (original)
                return original;
            var proto = Object.getPrototypeOf(value);
            switch (proto) {
                case Array.prototype: {
                    if (this.known.has(value))
                        return value;
                    var array = value.map(this.admit, this);
                    var node = this.pool.lookupArray(array);
                    if (!node.array) {
                        this.known.add(node.array = array);
                        if (__DEV__) {
                            Object.freeze(array);
                        }
                    }
                    return node.array;
                }
                case null:
                case Object.prototype: {
                    if (this.known.has(value))
                        return value;
                    var proto_1 = Object.getPrototypeOf(value);
                    var array_1 = [proto_1];
                    var keys = this.sortedKeys(value);
                    array_1.push(keys.json);
                    var firstValueIndex_1 = array_1.length;
                    keys.sorted.forEach(function (key) {
                        array_1.push(_this.admit(value[key]));
                    });
                    var node = this.pool.lookupArray(array_1);
                    if (!node.object) {
                        var obj_1 = node.object = Object.create(proto_1);
                        this.known.add(obj_1);
                        keys.sorted.forEach(function (key, i) {
                            obj_1[key] = array_1[firstValueIndex_1 + i];
                        });
                        if (__DEV__) {
                            Object.freeze(obj_1);
                        }
                    }
                    return node.object;
                }
            }
        }
        return value;
    };
    ObjectCanon.prototype.sortedKeys = function (obj) {
        var keys = Object.keys(obj);
        var node = this.pool.lookupArray(keys);
        if (!node.keys) {
            keys.sort();
            var json = JSON.stringify(keys);
            if (!(node.keys = this.keysByJSON.get(json))) {
                this.keysByJSON.set(json, node.keys = { sorted: keys, json: json });
            }
        }
        return node.keys;
    };
    return ObjectCanon;
}());
export { ObjectCanon };
export var canonicalStringify = Object.assign(function (value) {
    if (isObjectOrArray(value)) {
        if (stringifyCanon === void 0) {
            resetCanonicalStringify();
        }
        var canonical = stringifyCanon.admit(value);
        var json = stringifyCache.get(canonical);
        if (json === void 0) {
            stringifyCache.set(canonical, json = JSON.stringify(canonical));
        }
        return json;
    }
    return JSON.stringify(value);
}, {
    reset: resetCanonicalStringify,
});
var stringifyCanon;
var stringifyCache;
function resetCanonicalStringify() {
    stringifyCanon = new ObjectCanon;
    stringifyCache = new (canUseWeakMap ? WeakMap : Map)();
}
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