deep-equality-data-structures
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Javascript data structures (e.g., Map, Set) that support deep object equality
89 lines (88 loc) • 3.69 kB
JavaScript
;
var __rest = (this && this.__rest) || function (s, e) {
var t = {};
for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p) && e.indexOf(p) < 0)
t[p] = s[p];
if (s != null && typeof Object.getOwnPropertySymbols === "function")
for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) {
if (e.indexOf(p[i]) < 0 && Object.prototype.propertyIsEnumerable.call(s, p[i]))
t[p[i]] = s[p[i]];
}
return t;
};
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.Normalizer = void 0;
const object_hash_1 = __importDefault(require("object-hash"));
const options_1 = require("./options");
const transformers_1 = require("./transformers");
const utils_1 = require("./utils");
/**
* Class that normalizes object types to strings via hashing
*/
class Normalizer {
constructor(options = {}) {
this.optionsChecksum = (0, object_hash_1.default)(options);
const _a = (0, options_1.getOptionsWithDefaults)(options), { transformer, mapValueTransformer, useToJsonTransform, caseInsensitive } = _a, objectHashOptions = __rest(_a, ["transformer", "mapValueTransformer", "useToJsonTransform", "caseInsensitive"]);
this.objectHashOptions = objectHashOptions;
this.caseInsensitive = caseInsensitive;
this.keyTransformer = useToJsonTransform
? (0, utils_1.chain)([transformers_1.Transformers.jsonSerializeDeserialize, transformer])
: transformer;
this.valueTransformer = useToJsonTransform
? (0, utils_1.chain)([transformers_1.Transformers.jsonSerializeDeserialize, mapValueTransformer])
: mapValueTransformer;
if (caseInsensitive) {
// NOTE: This block ensures case-insensitivity inside objects only.
// See normalizeHelper() for logic which handles primitive strings
const caseInsensitiveReplacer = (val) => typeof val === 'string' ? val.toLowerCase() : val;
const { replacer } = this.objectHashOptions;
this.objectHashOptions.replacer = replacer
? (0, utils_1.chain)([caseInsensitiveReplacer, replacer])
: caseInsensitiveReplacer;
}
}
/**
* @returns the checksum for the options passed to this Normalizer
*/
getOptionsChecksum() {
return this.optionsChecksum;
}
/**
* Normalize the input by transforming and then hashing the result (if an object)
* @param input the input to normalize
* @returns the normalized result
*/
normalizeKey(input) {
return this.normalizeHelper(this.keyTransformer(input));
}
/**
* Normalize the input by transforming and then hashing the result (if an object)
* @param input the input to normalize
* @returns the normalized result
*/
normalizeValue(input) {
return this.normalizeHelper(this.valueTransformer(input));
}
normalizeHelper(input) {
if (Normalizer.isObject(input)) {
return (0, object_hash_1.default)(input, this.objectHashOptions);
}
else if (this.caseInsensitive && typeof input === 'string') {
return input.toLowerCase();
}
else {
// Primitive value, don't hash
return input;
}
}
/**
* Returns true if the input is a javascript object.
*/
static isObject(input) {
return typeof input === 'object' && input !== null;
}
}
exports.Normalizer = Normalizer;