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Issue 1486473002: Convert dart_utils.js to input_sdk/lib/_internal/utils.dart (#310) (Closed) Base URL: git@github.com:dart-lang/dev_compiler.git@master
Patch Set: Rebased Created 5 years ago
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1 // Copyright (c) 2015, the Dart project authors. Please see the AUTHORS file
2 // for details. All rights reserved. Use of this source code is governed by a
3 // BSD-style license that can be found in the LICENSE file.
4
5 /* This library defines a set of general javascript utilities for us
6 * by the Dart runtime.
7 */
8
9 var dart_utils =
10 typeof module != "undefined" && module.exports || {};
11
12 (function (dart_utils) {
13 'use strict';
14
15 const defineProperty = Object.defineProperty;
16 const getOwnPropertyDescriptor = Object.getOwnPropertyDescriptor;
17 const getOwnPropertyNames = Object.getOwnPropertyNames;
18 const getOwnPropertySymbols = Object.getOwnPropertySymbols;
19
20 const hasOwnProperty = Object.prototype.hasOwnProperty;
21
22 class StrongModeError extends Error {
23 constructor(message) {
24 super(message);
25 }
26 }
27
28 /** This error indicates a strong mode specific failure.
29 */
30 function throwStrongModeError(message) {
31 throw new StrongModeError(message);
32 }
33 dart_utils.throwStrongModeError = throwStrongModeError;
34
35 /** This error indicates a bug in the runtime or the compiler.
36 */
37 function throwInternalError(message) {
38 throw Error(message);
39 }
40 dart_utils.throwInternalError = throwInternalError;
41
42 function assert(condition) {
43 if (!condition) throwInternalError("The compiler is broken: failed assert");
44 }
45 dart_utils.assert = assert;
46
47 function getOwnNamesAndSymbols(obj) {
48 return getOwnPropertyNames(obj).concat(getOwnPropertySymbols(obj));
49 }
50 dart_utils.getOwnNamesAndSymbols = getOwnNamesAndSymbols;
51
52 function safeGetOwnProperty(obj, name) {
53 let desc = getOwnPropertyDescriptor(obj, name);
54 if (desc) return desc.value;
55 }
56 dart_utils.safeGetOwnProperty = safeGetOwnProperty;
57
58 /**
59 * Defines a lazy property.
60 * After initial get or set, it will replace itself with a value property.
61 */
62 // TODO(jmesserly): reusing descriptor objects has been shown to improve
63 // performance in other projects (e.g. webcomponents.js ShadowDOM polyfill).
64 function defineLazyProperty(to, name, desc) {
65 let init = desc.get;
66 let value = null;
67
68 function lazySetter(x) {
69 init = null;
70 value = x;
71 }
72 function circularInitError() {
73 throwInternalError('circular initialization for field ' + name);
74 }
75 function lazyGetter() {
76 if (init == null) return value;
77
78 // Compute and store the value, guarding against reentry.
79 let f = init;
80 init = circularInitError;
81 lazySetter(f());
82 return value;
83 }
84 desc.get = lazyGetter;
85 desc.configurable = true;
86 if (desc.set) desc.set = lazySetter;
87 return defineProperty(to, name, desc);
88 }
89 dart_utils.defineLazyProperty = defineLazyProperty;
90
91 function defineLazy(to, from) {
92 for (let name of getOwnNamesAndSymbols(from)) {
93 defineLazyProperty(to, name, getOwnPropertyDescriptor(from, name));
94 }
95 }
96 dart_utils.defineLazy = defineLazy;
97
98 function defineMemoizedGetter(obj, name, getter) {
99 return defineLazyProperty(obj, name, {get: getter});
100 }
101 dart_utils.defineMemoizedGetter = defineMemoizedGetter;
102
103 function copyTheseProperties(to, from, names) {
104 for (let name of names) {
105 defineProperty(to, name, getOwnPropertyDescriptor(from, name));
106 }
107 return to;
108 }
109 dart_utils.copyTheseProperties = copyTheseProperties;
110
111 /**
112 * Copy properties from source to destination object.
113 * This operation is commonly called `mixin` in JS.
114 */
115 function copyProperties(to, from) {
116 return copyTheseProperties(to, from, getOwnNamesAndSymbols(from));
117 }
118 dart_utils.copyProperties = copyProperties;
119
120 /** Exports from one Dart module to another. */
121 function export_(to, from, show, hide) {
122 if (show == void 0) {
123 show = getOwnNamesAndSymbols(from);
124 }
125 if (hide != void 0) {
126 var hideMap = new Set(hide);
127 show = show.filter((k) => !hideMap.has(k));
128 }
129 return copyTheseProperties(to, from, show);
130 }
131 dart_utils.export = export_;
132
133 })(dart_utils);
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