| // Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| import 'package:source_span/source_span.dart'; |
| |
| import 'style.dart'; |
| |
| /// A token emitted by a [Scanner]. |
| class Token { |
| final TokenType type; |
| final FileSpan span; |
| |
| Token(this.type, this.span); |
| |
| @override |
| String toString() => type.toString(); |
| } |
| |
| /// A token representing a `%YAML` directive. |
| class VersionDirectiveToken implements Token { |
| @override |
| TokenType get type => TokenType.versionDirective; |
| @override |
| final FileSpan span; |
| |
| /// The declared major version of the document. |
| final int major; |
| |
| /// The declared minor version of the document. |
| final int minor; |
| |
| VersionDirectiveToken(this.span, this.major, this.minor); |
| |
| @override |
| String toString() => 'VERSION_DIRECTIVE $major.$minor'; |
| } |
| |
| /// A token representing a `%TAG` directive. |
| class TagDirectiveToken implements Token { |
| @override |
| TokenType get type => TokenType.tagDirective; |
| @override |
| final FileSpan span; |
| |
| /// The tag handle used in the document. |
| final String handle; |
| |
| /// The tag prefix that the handle maps to. |
| final String prefix; |
| |
| TagDirectiveToken(this.span, this.handle, this.prefix); |
| |
| @override |
| String toString() => 'TAG_DIRECTIVE $handle $prefix'; |
| } |
| |
| /// A token representing an anchor (`&foo`). |
| class AnchorToken implements Token { |
| @override |
| TokenType get type => TokenType.anchor; |
| @override |
| final FileSpan span; |
| |
| final String name; |
| |
| AnchorToken(this.span, this.name); |
| |
| @override |
| String toString() => 'ANCHOR $name'; |
| } |
| |
| /// A token representing an alias (`*foo`). |
| class AliasToken implements Token { |
| @override |
| TokenType get type => TokenType.alias; |
| @override |
| final FileSpan span; |
| |
| final String name; |
| |
| AliasToken(this.span, this.name); |
| |
| @override |
| String toString() => 'ALIAS $name'; |
| } |
| |
| /// A token representing a tag (`!foo`). |
| class TagToken implements Token { |
| @override |
| TokenType get type => TokenType.tag; |
| @override |
| final FileSpan span; |
| |
| /// The tag handle for named tags. |
| final String handle; |
| |
| /// The tag suffix, or `null`. |
| final String suffix; |
| |
| TagToken(this.span, this.handle, this.suffix); |
| |
| @override |
| String toString() => 'TAG $handle $suffix'; |
| } |
| |
| /// A scalar value. |
| class ScalarToken implements Token { |
| @override |
| TokenType get type => TokenType.scalar; |
| @override |
| final FileSpan span; |
| |
| /// The unparsed contents of the value.. |
| final String value; |
| |
| /// The style of the scalar in the original source. |
| final ScalarStyle style; |
| |
| ScalarToken(this.span, this.value, this.style); |
| |
| @override |
| String toString() => 'SCALAR $style "$value"'; |
| } |
| |
| /// The types of [Token] objects. |
| enum TokenType { |
| streamStart, |
| streamEnd, |
| |
| versionDirective, |
| tagDirective, |
| documentStart, |
| documentEnd, |
| |
| blockSequenceStart, |
| blockMappingStart, |
| blockEnd, |
| |
| flowSequenceStart, |
| flowSequenceEnd, |
| flowMappingStart, |
| flowMappingEnd, |
| |
| blockEntry, |
| flowEntry, |
| key, |
| value, |
| |
| alias, |
| anchor, |
| tag, |
| scalar |
| } |