public SymbolTableEntry Enter(string name)
{
SymbolTableEntry entry;
if (!(entries.TryGetValue(name, out entry)))
{
entry = new SymbolTableEntry(name);
entries.Add(name, entry);
}
return(entry);
}
// <logo-routine-call-command> ::= <identifier>
private BaseLogoCommand ParseLogoRoutineCall()
{
Match(Token.IDENTIFIER);
SymbolTableEntry routineEntry = symbolTable.Lookup(scanner.ScanBuffer);
SymbolTableRoutineAttribute routineAttribute = null;
if (!routineEntry.TryLookupRoutineAttribute(ref routineAttribute))
{
SyntaxError(String.Format("Unknown routine name {0}", scanner.ScanBuffer), LogoErrorCode.RoutineCallError);
}
return(new LogoRoutineCallCommand(scanner.ScanBuffer, routineAttribute.Commands));
}
// <logo-routine-declaration> ::= TO <identifier> <logo-sentences> END <EOF>
private void ParseLogoRoutineDeclaration()
{
Match(Token.TO);
Match(Token.IDENTIFIER);
SymbolTableEntry entry = symbolTable.Enter(scanner.ScanBuffer);
var routineCommands = new Collection <BaseLogoCommand>();
ParseLogoSentences(routineCommands);
var routineAttribute = new SymbolTableRoutineAttribute(routineCommands);
entry.AddAttribute(routineAttribute);
Match(Token.END);
DomainEvents.Raise(new LogoRoutineEvent(symbolTable.LookupRoutines()));
}
