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Side by Side Diff: utils/template/token.dart

Issue 9695048: Template parser (Closed) Base URL: https://dart.googlecode.com/svn/branches/bleeding_edge/dart
Patch Set: Siggi's comments Created 8 years, 9 months ago
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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 /**
6 * A single token in the Dart language.
7 */
8 class Token {
9 /** A member of [TokenKind] specifying what kind of token this is. */
10 final int kind;
11
12 /** The [SourceFile] this token came from. */
13 final SourceFile source;
14
15 /** The start and end indexes into the [SourceFile] of this [Token]. */
16 final int start, end;
17
18 Token(this.kind, this.source, this.start, this.end) {}
19
20 Token.fake(this.kind, span)
21 : this.source = span.file, this.start = span.start, this.end = span.end;
22
23 /** Returns the source text corresponding to this [Token]. */
24 String get text() {
25 return source.text.substring(start, end);
26 }
27
28 /** Returns a pretty representation of this token for error messages. **/
29 String toString() {
30 var kindText = TokenKind.kindToString(kind);
31 var actualText = text;
32 if (kindText != actualText) {
33 if (actualText.length > 10) {
34 actualText = actualText.substring(0, 8) + '...';
35 }
36 return '$kindText($actualText)';
37 } else {
38 return kindText;
39 }
40 }
41
42 /** Returns a [SourceSpan] representing the source location. */
43 SourceSpan get span() {
44 return new SourceSpan(source, start, end);
45 }
46 }
47
48 /** A token containing a parsed literal value. */
49 class LiteralToken extends Token {
50 var value;
51 LiteralToken(kind, source, start, end, this.value)
52 : super(kind, source, start, end);
53 }
54
55 /** A token containing error information. */
56 class ErrorToken extends Token {
57 String message;
58 ErrorToken(kind, source, start, end, this.message)
59 : super(kind, source, start, end);
60 }
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