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1 // Copyright (c) 2013, 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 part of dart2js.js_emitter; | |
6 | |
7 /** | |
8 * A data structure for collecting fragments of a class definition. | |
9 */ | |
10 class ClassBuilder { | |
11 final List<jsAst.Property> properties = <jsAst.Property>[]; | |
12 final List<String> fields = <String>[]; | |
13 | |
14 String superName; | |
15 String functionType; | |
16 List<jsAst.Node> fieldMetadata; | |
17 | |
18 final Element element; | |
19 final Namer namer; | |
20 | |
21 /// Set to true by user if class is indistinguishable from its superclass. | |
22 bool isTrivial = false; | |
23 | |
24 ClassBuilder(this.element, this.namer); | |
25 | |
26 // Has the same signature as [DefineStubFunction]. | |
27 jsAst.Property addProperty(String name, jsAst.Expression value) { | |
28 jsAst.Property property = new jsAst.Property(js.string(name), value); | |
29 properties.add(property); | |
30 return property; | |
31 } | |
32 | |
33 void addField(String field) { | |
34 fields.add(field); | |
35 } | |
36 | |
37 jsAst.ObjectInitializer toObjectInitializer() { | |
38 StringBuffer buffer = new StringBuffer(); | |
39 if (superName != null) { | |
40 buffer.write('$superName'); | |
41 if (functionType != null) { | |
42 buffer.write(':$functionType'); | |
43 } | |
44 buffer.write(';'); | |
45 } | |
46 buffer.writeAll(fields, ','); | |
47 var classData = js.string('$buffer'); | |
48 if (fieldMetadata != null) { | |
49 // If we need to store fieldMetadata, classData is turned into an array, | |
50 // and the field metadata is appended. So if classData is just a string, | |
51 // there is no field metadata. | |
52 classData = | |
53 new jsAst.ArrayInitializer.from([classData]..addAll(fieldMetadata)); | |
54 } | |
55 var fieldsAndProperties = | |
56 [new jsAst.Property(js.string(namer.classDescriptorProperty), | |
57 classData)] | |
58 ..addAll(properties); | |
59 return new jsAst.ObjectInitializer(fieldsAndProperties, isOneLiner: false); | |
60 } | |
61 | |
62 } | |
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