private PreprocessorTokenType PeekType()
{
if (token == null)
{
token = NextToken();
}
return(token.Type);
}
public PreprocessorKeywords(NameTable symbolTable)
{
keywords = new Hashtable();
for (PreprocessorTokenType token = 0; token < PreprocessorTokenType.Identifier; token += 1)
{
keywords.Add(symbolTable.Add(PreprocessorToken.TypeString(token)), token);
}
}
private PreprocessorToken Eat(PreprocessorTokenType type)
{
if (PeekType() != type)
{
ReportFormattedError(PreprocessorError.TokenExpected, PreprocessorToken.TypeString(type));
return(null);
}
return(NextToken());
}
private PreprocessorToken NextToken()
{
if (this.token == null)
{
return(lexer.NextToken(text));
}
PreprocessorToken token = this.token;
this.token = null;
return(token);
}
public PreprocessorLine Parse(TextBuffer text, IDictionary defines)
{
this.text = text;
this.defines = defines;
Debug.Assert(text.PeekChar() == '#');
text.NextChar();
PreprocessorToken token = NextToken();
PreprocessorTokenType type = token.Type;
switch (type)
{
case PreprocessorTokenType.Define:
case PreprocessorTokenType.Undef:
token = Eat(PreprocessorTokenType.Identifier);
EatEndOfLine();
if (token != null)
{
return(new PreprocessorDeclarationLine(type, ((PreprocessorIdentifierToken)token).Value));
}
else
{
return(null);
}
case PreprocessorTokenType.Warning:
case PreprocessorTokenType.Error:
return(new PreprocessorControlLine(type, lexer.GetRestOfLine()));
case PreprocessorTokenType.Line:
// hidden, default
type = PeekType();
if (type == PreprocessorTokenType.Default || type == PreprocessorTokenType.Hidden)
{
NextToken();
EatEndOfLine();
return(new PreprocessorLine(type));
}
token = Eat(PreprocessorTokenType.Int);
if (token != null)
{
int line = ((PreprocessorIntToken)token).Value;
string file = null;
if (PeekType() == PreprocessorTokenType.String)
{
file = ((PreprocessorStringToken)NextToken()).Value;
}
EatEndOfLine();
return(new PreprocessorLineNumberLine(line, file));
}
else
{
lexer.IgnoreRestOfLine();
return(null);
}
case PreprocessorTokenType.If:
case PreprocessorTokenType.Elif:
return(new PreprocessorIfLine(type, EvalExpression()));
case PreprocessorTokenType.Else:
case PreprocessorTokenType.Endif:
return(new PreprocessorLine(type));
case PreprocessorTokenType.Region:
case PreprocessorTokenType.EndRegion:
lexer.IgnoreRestOfLine();
return(new PreprocessorLine(type));
case PreprocessorTokenType.Pragma:
lexer.IgnoreRestOfLine();
return(new PreprocessorLine(type));
default:
ReportError(PreprocessorError.UnexpectedDirective, token.Position);
return(null);
}
}
