public static Definition ParseDefinition(Scanner scanner)
{
if (scanner.TryGetIdentifier("function"))
{
string returntype;
string name;
List <string> parametertypes = new List <string>();
List <string> parameternames = new List <string>();
scanner.GetIdentifier(out returntype);
scanner.GetIdentifier(out name);
scanner.GetDelimiter("(");
if (!scanner.TryGetDelimiter(")"))
{
do
{
string parametertype;
string parametername;
scanner.GetIdentifier(out parametertype);
scanner.GetIdentifier(out parametername);
parametertypes.Add(parametertype);
parameternames.Add(parametername);
}while (scanner.TryGetDelimiter(","));
scanner.GetDelimiter(")");
}
scanner.GetDelimiter("{");
Statement statement = CodeParser.ParseBlock(scanner.ScanAcross("{", "}"));
return(new FunctionDefinition(name, returntype, parametertypes.ToArray(), parameternames.ToArray(), statement));
}
else if (scanner.TryGetIdentifier("linedefspecial"))
{
List <LinedefSpecialAttribute> attributes = new List <LinedefSpecialAttribute>();
do
{
int number;
scanner.GetInteger(out number);
LinedefSpecialAttribute attribute = new LinedefSpecialAttribute(number);
scanner.GetDelimiter("(");
while (!scanner.TryGetDelimiter(")"))
{
if (scanner.TryGetIdentifier("auto"))
{
attribute.ActivationType |= LinedefActivationType.Automatic;
}
else if (scanner.TryGetIdentifier("use"))
{
attribute.ActivationType |= LinedefActivationType.Use;
}
else if (scanner.TryGetIdentifier("monsteruse"))
{
attribute.ActivationType |= LinedefActivationType.MonsterUse;
}
else if (scanner.TryGetIdentifier("cross"))
{
attribute.ActivationType |= LinedefActivationType.Cross;
}
else if (scanner.TryGetIdentifier("monstercross"))
{
attribute.ActivationType |= LinedefActivationType.MonsterCross;
}
else if (scanner.TryGetIdentifier("shoot"))
{
attribute.ActivationType |= LinedefActivationType.Shoot;
}
else if (scanner.TryGetIdentifier("monstershoot"))
{
attribute.ActivationType |= LinedefActivationType.MonsterShoot;
}
else if (scanner.TryGetIdentifier("repeatable"))
{
attribute.Repeatable = true;
}
else
{
throw new ApplicationException();
}
}
attributes.Add(attribute);
}while (scanner.TryGetDelimiter(","));
scanner.GetDelimiter("{");
Statement statement = CodeParser.ParseBlock(scanner.ScanAcross("{", "}"));
return(new LinedefSpecialDefinition(statement, attributes));
}
else
{
throw new ApplicationException();
}
}
private static Statement ParseStatement(Scanner scanner)
{
if (scanner.TryGetIdentifier("if"))
{
scanner.GetDelimiter("(");
Expression condition = ParseExpression(scanner);
scanner.GetDelimiter(")");
Statement thenstatement = ParseStatement(scanner);
Statement elsestatement = new NullStatement();
if (scanner.TryGetIdentifier("else"))
{
elsestatement = ParseStatement(scanner);
}
return(new IfStatement(condition, thenstatement, elsestatement));
}
else if (scanner.TryGetIdentifier("while"))
{
scanner.GetDelimiter("(");
Expression condition = ParseExpression(scanner);
scanner.GetDelimiter(")");
Statement loopstatement = ParseStatement(scanner);
Statement elsestatement = new NullStatement();
if (scanner.TryGetIdentifier("else"))
{
elsestatement = ParseStatement(scanner);
}
return(new WhileStatement(condition, loopstatement, elsestatement));
}
else if (scanner.TryGetIdentifier("foreach"))
{
scanner.GetDelimiter("(");
string variabletype;
string variablename;
scanner.GetIdentifier(out variabletype);
scanner.GetIdentifier(out variablename);
scanner.GetIdentifier("in");
Expression collection = ParseExpression(scanner);
scanner.GetDelimiter(")");
Statement loopstatement = ParseStatement(scanner);
Statement elsestatement = new NullStatement();
if (scanner.TryGetIdentifier("else"))
{
elsestatement = ParseStatement(scanner);
}
return(new ForEachStatement(variabletype, variablename, collection, loopstatement, elsestatement));
}
else if (scanner.TryGetIdentifier("var"))
{
string variablename;
scanner.GetIdentifier(out variablename);
scanner.GetDelimiter("=");
Expression expression = ParseExpression(scanner);
scanner.GetDelimiter(";");
return(new VarStatement(variablename, expression));
}
else if (scanner.TryGetIdentifier("return"))
{
if (scanner.TryGetDelimiter(";"))
{
return(new ReturnStatement(null));
}
else
{
Expression expression = ParseExpression(scanner);
scanner.GetDelimiter(";");
return(new ReturnStatement(expression));
}
}
else if (scanner.TryGetDelimiter("{"))
{
return(CodeParser.ParseBlock(scanner.ScanAcross("{", "}")));
}
else if (scanner.TryGetDelimiter(";"))
{
return(new NullStatement());
}
else
{
Expression expression = ParseExpression(scanner);
scanner.GetDelimiter(";");
return(new ExpressionStatement(expression));
}
}
