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161 lines (133 loc) · 3.88 KB
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namespace Tvl.VisualStudio.Language.Java
{
using System;
using System.Diagnostics.Contracts;
using Antlr.Runtime;
using Tvl.VisualStudio.Language.Parsing;
internal class JavaClassifierLexer : ITokenSourceWithState<JavaClassifierLexerState>
{
private readonly ICharStream _input;
private readonly JavaColorizerLexer _languageLexer;
private readonly JavaDocCommentClassifierLexer _commentLexer;
private JavaClassifierLexerMode _mode;
private bool _inComment;
public JavaClassifierLexer(ICharStream input)
: this(input, JavaClassifierLexerState.Initial)
{
Contract.Requires(input != null);
}
public JavaClassifierLexer(ICharStream input, JavaClassifierLexerState state)
{
Contract.Requires<ArgumentNullException>(input != null, "input");
_input = input;
_languageLexer = new JavaColorizerLexer(input, this);
_commentLexer = new JavaDocCommentClassifierLexer(input, this);
State = state;
}
public ICharStream CharStream
{
get
{
return _input;
}
}
public string SourceName
{
get
{
return "Java Classifier";
}
}
public string[] TokenNames
{
get
{
return _languageLexer.TokenNames;
}
}
internal JavaClassifierLexerState State
{
get
{
return new JavaClassifierLexerState(_mode, _inComment);
}
set
{
_mode = value.Mode;
_inComment = value.InComment;
}
}
internal JavaClassifierLexerMode Mode
{
get
{
return _mode;
}
set
{
_mode = value;
}
}
internal bool InComment
{
get
{
return _inComment;
}
set
{
_inComment = value;
}
}
public JavaClassifierLexerState GetCurrentState()
{
return State;
}
public IToken NextToken()
{
IToken token = null;
do
{
int position = _input.Index;
token = NextTokenCore();
// ensure progress
if (position == _input.Index)
_input.Consume();
} while (token == null || token.Type == JavaColorizerLexer.NEWLINE);
return token;
}
private IToken NextTokenCore()
{
IToken token = null;
switch (Mode)
{
case JavaClassifierLexerMode.JavaDocComment:
token = _commentLexer.NextToken();
switch (token.Type)
{
case JavaDocCommentClassifierLexer.END_COMMENT:
_mode = JavaClassifierLexerMode.JavaCode;
token.Type = JavaDocCommentClassifierLexer.DOC_COMMENT_TEXT;
break;
default:
break;
}
break;
case JavaClassifierLexerMode.JavaCode:
default:
token = _languageLexer.NextToken();
switch (token.Type)
{
case JavaColorizerLexer.DOC_COMMENT_START:
_mode = JavaClassifierLexerMode.JavaDocComment;
token.Type = JavaDocCommentClassifierLexer.DOC_COMMENT_TEXT;
break;
default:
break;
}
break;
}
return token;
}
}
}