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| 1 // Copyright (c) 2011, 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 * The base type for all nodes in a dart abstract syntax tree. | |
| 6 */ | |
| 7 class Node { | |
| 8 /** The source code this [Node] represents. */ | |
| 9 SourceSpan span; | |
| 10 | |
| 11 Node(this.span) {} | |
| 12 | |
| 13 /** Classic double-dispatch visitor for implementing passes. */ | |
| 14 abstract visit(TreeVisitor visitor); | |
| 15 | |
| 16 /** A multiline string showing the node and its children. */ | |
| 17 String toDebugString() { | |
| 18 var to = new TreeOutput(); | |
| 19 var tp = new TreePrinter(to); | |
| 20 this.visit(tp); | |
| 21 return to.buf.toString(); | |
| 22 } | |
| 23 } | |
| 24 | |
| 25 /** Represents all definitions allowed at the top-level. */ | |
| 26 class Definition extends Statement { | |
| 27 Definition(SourceSpan span): super(span) {} | |
| 28 | |
| 29 List<TypeParameter> get typeParameters() => null; | |
| 30 NativeType get nativeType() => null; | |
| 31 } | |
| 32 | |
| 33 /** The base type for statements. */ | |
| 34 class Statement extends Node { | |
| 35 Statement(SourceSpan span): super(span) {} | |
| 36 } | |
| 37 | |
| 38 /** The base type for expressions. */ | |
| 39 class Expression extends Node { | |
| 40 Expression(SourceSpan span): super(span) {} | |
| 41 } | |
| 42 | |
| 43 /** The base type for a reference to a [Type]. */ | |
| 44 class TypeReference extends Node { | |
| 45 TypeReference(SourceSpan span): super(span) {} | |
| 46 } | |
| 47 | |
| 48 // TODO(jimhug): Clean-up and factor out of core. | |
| 49 /** Simple class to provide a textual dump of trees for debugging. */ | |
| 50 class TreeOutput { | |
| 51 int depth; | |
| 52 StringBuffer buf; | |
| 53 | |
| 54 var printer; | |
| 55 | |
| 56 static void dump(Node node) { | |
| 57 var o = new TreeOutput(); | |
| 58 node.visit(new TreePrinter(o)); | |
| 59 print(o.buf); | |
| 60 } | |
| 61 | |
| 62 TreeOutput(): this.depth = 0, this.buf = new StringBuffer() { | |
| 63 } | |
| 64 | |
| 65 void write(String s) { | |
| 66 for (int i=0; i < depth; i++) { | |
| 67 buf.add(' '); | |
| 68 } | |
| 69 buf.add(s); | |
| 70 } | |
| 71 | |
| 72 void writeln(String s) { | |
| 73 write(s); | |
| 74 buf.add('\n'); | |
| 75 } | |
| 76 | |
| 77 void heading(String name, span) { | |
| 78 write(name); | |
| 79 buf.add(' (${span.locationText})'); | |
| 80 buf.add('\n'); | |
| 81 } | |
| 82 | |
| 83 String toValue(value) { | |
| 84 if (value == null) return 'null'; | |
| 85 else if (value is Identifier) return value.name; | |
| 86 else return value.toString(); | |
| 87 } | |
| 88 | |
| 89 void writeNode(String label, Node node) { | |
| 90 write(label + ': '); | |
| 91 depth += 1; | |
| 92 if (node != null) node.visit(printer); | |
| 93 else writeln('null'); | |
| 94 depth -= 1; | |
| 95 } | |
| 96 | |
| 97 void writeValue(String label, value) { | |
| 98 var v = toValue(value); | |
| 99 writeln('${label}: ${v}'); | |
| 100 } | |
| 101 | |
| 102 void writeList(String label, List list) { | |
| 103 write(label + ': '); | |
| 104 if (list == null) { | |
| 105 buf.add('null'); | |
| 106 buf.add('\n'); | |
| 107 } else { | |
| 108 for (var item in list) { | |
| 109 buf.add(item.toString()); | |
| 110 buf.add(', '); | |
| 111 } | |
| 112 buf.add('\n'); | |
| 113 } | |
| 114 } | |
| 115 | |
| 116 void writeNodeList(String label, List list) { | |
| 117 writeln('${label} ['); | |
| 118 if (list != null) { | |
| 119 depth += 1; | |
| 120 for (var node in list) { | |
| 121 if (node != null) { | |
| 122 node.visit(printer); | |
| 123 } else { | |
| 124 writeln('null'); | |
| 125 } | |
| 126 } | |
| 127 depth -= 1; | |
| 128 writeln(']'); | |
| 129 } | |
| 130 } | |
| 131 } | |
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Chromium Code Reviews
Issue 10696191:
Frog removed from dartdoc. (Closed)
Base URL: https://dart.googlecode.com/svn/branches/bleeding_edge/dart