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 ) {
1+ dart_library . library ( 'dart/_utils' , null , /* Imports */ [
2+ ] , /* Lazy imports */ [
3+ ] , function ( exports , dart ) {
134 'use strict' ;
14-
155 const defineProperty = Object . defineProperty ;
166 const getOwnPropertyDescriptor = Object . getOwnPropertyDescriptor ;
177 const getOwnPropertyNames = Object . getOwnPropertyNames ;
188 const getOwnPropertySymbols = Object . getOwnPropertySymbols ;
19-
209 const hasOwnProperty = Object . prototype . hasOwnProperty ;
21-
22- class StrongModeError extends Error {
23- constructor ( message ) {
24- super ( message ) ;
10+ const StrongModeError = ( function ( ) {
11+ function StrongModeError ( message ) {
12+ Error . call ( this ) ;
13+ this . message = message ;
2514 }
26- }
27-
28- /** This error indicates a strong mode specific failure.
29- */
15+ ;
16+ Object . setPrototypeOf ( StrongModeError . prototype , Error . prototype ) ;
17+ return StrongModeError ;
18+ } ) ( ) ;
3019 function throwStrongModeError ( message ) {
3120 throw new StrongModeError ( message ) ;
3221 }
33- dart_utils . throwStrongModeError = throwStrongModeError ;
34-
35- /** This error indicates a bug in the runtime or the compiler.
36- */
3722 function throwInternalError ( message ) {
3823 throw Error ( message ) ;
3924 }
40- dart_utils . throwInternalError = throwInternalError ;
41-
42- function assert ( condition ) {
43- if ( ! condition ) throwInternalError ( "The compiler is broken: failed assert" ) ;
25+ function assert_ ( condition ) {
26+ if ( ! condition )
27+ throwInternalError ( "The compiler is broken: failed assert" ) ;
4428 }
45- dart_utils . assert = assert ;
46-
4729 function getOwnNamesAndSymbols ( obj ) {
4830 return getOwnPropertyNames ( obj ) . concat ( getOwnPropertySymbols ( obj ) ) ;
4931 }
50- dart_utils . getOwnNamesAndSymbols = getOwnNamesAndSymbols ;
51-
5232 function safeGetOwnProperty ( obj , name ) {
5333 let desc = getOwnPropertyDescriptor ( obj , name ) ;
54- if ( desc ) return desc . value ;
34+ if ( desc )
35+ return desc . value ;
5536 }
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).
6437 function defineLazyProperty ( to , name , desc ) {
6538 let init = desc . get ;
6639 let value = null ;
67-
6840 function lazySetter ( x ) {
6941 init = null ;
7042 value = x ;
@@ -73,61 +45,62 @@ var dart_utils =
7345 throwInternalError ( 'circular initialization for field ' + name ) ;
7446 }
7547 function lazyGetter ( ) {
76- if ( init == null ) return value ;
77-
78- // Compute and store the value, guarding against reentry.
48+ if ( init == null )
49+ return value ;
7950 let f = init ;
8051 init = circularInitError ;
8152 lazySetter ( f ( ) ) ;
8253 return value ;
8354 }
8455 desc . get = lazyGetter ;
8556 desc . configurable = true ;
86- if ( desc . set ) desc . set = lazySetter ;
57+ if ( desc . set )
58+ desc . set = lazySetter ;
8759 return defineProperty ( to , name , desc ) ;
8860 }
89- dart_utils . defineLazyProperty = defineLazyProperty ;
90-
9161 function defineLazy ( to , from ) {
9262 for ( let name of getOwnNamesAndSymbols ( from ) ) {
9363 defineLazyProperty ( to , name , getOwnPropertyDescriptor ( from , name ) ) ;
9464 }
9565 }
96- dart_utils . defineLazy = defineLazy ;
97-
9866 function defineMemoizedGetter ( obj , name , getter ) {
9967 return defineLazyProperty ( obj , name , { get : getter } ) ;
10068 }
101- dart_utils . defineMemoizedGetter = defineMemoizedGetter ;
102-
10369 function copyTheseProperties ( to , from , names ) {
10470 for ( let name of names ) {
10571 defineProperty ( to , name , getOwnPropertyDescriptor ( from , name ) ) ;
10672 }
10773 return to ;
10874 }
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- */
11575 function copyProperties ( to , from ) {
11676 return copyTheseProperties ( to , from , getOwnNamesAndSymbols ( from ) ) ;
11777 }
118- dart_utils . copyProperties = copyProperties ;
119-
120- /** Exports from one Dart module to another. */
12178 function export_ ( to , from , show , hide ) {
12279 if ( show == void 0 ) {
12380 show = getOwnNamesAndSymbols ( from ) ;
12481 }
12582 if ( hide != void 0 ) {
12683 var hideMap = new Set ( hide ) ;
127- show = show . filter ( ( k ) => ! hideMap . has ( k ) ) ;
84+ show = show . filter ( k => ! hideMap . has ( k ) ) ;
12885 }
12986 return copyTheseProperties ( to , from , show ) ;
13087 }
131- dart_utils . export = export_ ;
132-
133- } ) ( dart_utils ) ;
88+ // Exports:
89+ exports . defineProperty = defineProperty ;
90+ exports . getOwnPropertyDescriptor = getOwnPropertyDescriptor ;
91+ exports . getOwnPropertyNames = getOwnPropertyNames ;
92+ exports . getOwnPropertySymbols = getOwnPropertySymbols ;
93+ exports . hasOwnProperty = hasOwnProperty ;
94+ exports . StrongModeError = StrongModeError ;
95+ exports . throwStrongModeError = throwStrongModeError ;
96+ exports . throwInternalError = throwInternalError ;
97+ exports . assert_ = assert_ ;
98+ exports . getOwnNamesAndSymbols = getOwnNamesAndSymbols ;
99+ exports . safeGetOwnProperty = safeGetOwnProperty ;
100+ exports . defineLazyProperty = defineLazyProperty ;
101+ exports . defineLazy = defineLazy ;
102+ exports . defineMemoizedGetter = defineMemoizedGetter ;
103+ exports . copyTheseProperties = copyTheseProperties ;
104+ exports . copyProperties = copyProperties ;
105+ exports . export_ = export_ ;
106+ } ) ;
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