private StatementNode ParseStatement(Token initialToken)
{
if (initialToken.TokenType == Tokens.EndOfLine)
return null;
if (initialToken.TokenType == Tokens.Identifier)
{
StatementNode statement = new StatementNode();
var instructionTokens = new List<Token>();
Token t = _lex.GetNextToken();
if (t.TokenType == Tokens.Colon)
{
statement.Label = initialToken.SourceText;
t = _lex.GetNextToken();
}
else
{
instructionTokens.Add(initialToken);
}
while (t.TokenType != Tokens.EndOfLine)
{
instructionTokens.Add(t);
t = _lex.GetNextToken();
}
ParseInstruction(statement, instructionTokens);
return statement;
}
throw new UnexprectedTokenException(String.Format("Unexprected token: {0}", initialToken));
}
private ParameterNode ParseParemeter(Token token)
{
if (token.TokenType == Tokens.Identifier)
return new ParameterNode() { Identifier = token.SourceText };
if (token.TokenType == Tokens.Number)
{
Int32 numberLength = 0;
if (token.SourceText.Length == 3 || (token.SourceText.StartsWith("0") && token.SourceText.Length == 4))
numberLength = 8;
else if (token.SourceText.Length == 3 || (token.SourceText.StartsWith("0") && token.SourceText.Length == 4))
numberLength = 16;
else
throw new ApplicationException(String.Format("Invalid length for literal number: {0}", token.SourceText));
return new ParameterNode() { Number = GetNumber(token.SourceText), NumberSize = numberLength };
}
throw new UnexprectedTokenException(String.Format("Unexprected token: {0}", token));
}