Svyatoslav Kuzmich
102 lines
2.7 KiB
Kotlin
102 lines
2.7 KiB
Kotlin
/*
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* Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
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* that can be found in the license/LICENSE.txt file.
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*/
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package kotlin.js
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fun equals(obj1: dynamic, obj2: dynamic): Boolean {
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if (obj1 == null) {
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return obj2 == null
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}
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if (obj2 == null) {
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return false
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}
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return js("""
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if (typeof obj1 === "object" && typeof obj1.equals === "function") {
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return obj1.equals(obj2);
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}
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if (obj1 !== obj1) {
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return obj2 !== obj2;
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}
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if (typeof obj1 === "number" && typeof obj2 === "number") {
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return obj1 === obj2 && (obj1 !== 0 || 1 / obj1 === 1 / obj2)
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}
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return obj1 === obj2;
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""").unsafeCast<Boolean>()
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}
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fun toString(o: dynamic): String = when {
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o == null -> "null"
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isArrayish(o) -> "[...]"
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else -> js("o.toString()").unsafeCast<String>()
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}
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// TODO: Simplify, extract kotlin declarations for inner helper functions
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fun hashCode(obj: dynamic): Int {
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return js(
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"""
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function hashCode(obj) {
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if (obj == null) {
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return 0;
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}
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var objType = typeof obj;
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if ("object" === objType) {
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return "function" === typeof obj.hashCode ? obj.hashCode() : getObjectHashCode(obj);
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}
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if ("function" === objType) {
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return getObjectHashCode(obj);
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}
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if ("number" === objType) {
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return getNumberHashCode(obj);
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}
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if ("boolean" === objType) {
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return Number(obj)
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}
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var str = String(obj);
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return getStringHashCode(str);
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};
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/** @const */
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var POW_2_32 = 4294967296;
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// TODO: consider switching to Symbol type once we are on ES6.
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/** @const */
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var OBJECT_HASH_CODE_PROPERTY_NAME = "kotlinHashCodeValue${'$'}";
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function getObjectHashCode(obj) {
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if (!(OBJECT_HASH_CODE_PROPERTY_NAME in obj)) {
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var hash = (Math.random() * POW_2_32) | 0; // Make 32-bit singed integer.
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Object.defineProperty(obj, OBJECT_HASH_CODE_PROPERTY_NAME, { value: hash, enumerable: false });
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}
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return obj[OBJECT_HASH_CODE_PROPERTY_NAME];
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}
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function getStringHashCode(str) {
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var hash = 0;
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for (var i = 0; i < str.length; i++) {
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var code = str.charCodeAt(i);
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hash = (hash * 31 + code) | 0; // Keep it 32-bit.
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}
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return hash;
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}
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function getNumberHashCode(obj) {
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if ((obj | 0) === obj) {
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return obj | 0;
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}
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else {
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bufFloat64[0] = obj;
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return (bufInt32[highIndex] * 31 | 0) + bufInt32[lowIndex] | 0;
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}
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}
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return hashCode(obj);
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"""
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).unsafeCast<Int>()
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}
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