private Expr ParseFactor()
{
if (this.index == this.tokens.Count)
{
throw new System.Exception("expected expression, got EOF");
}
if (this.tokens[this.index] is StringToken)
{
StringVal stringLiteral = new StringVal();
stringLiteral.Value = ((StringToken)this.tokens[this.index]).Value;
MoveNext();
return(stringLiteral);
}
else if (this.tokens[this.index] is IntToken)
{
IntVal intVal = new IntVal();
intVal.Value = ((IntToken)this.tokens[this.index]).Value;
MoveNext();
return(intVal);
}
else if (this.tokens[this.index] is FloatToken)
{
FloatVal floVal = new FloatVal();
floVal.Value = ((FloatToken)this.tokens[this.index]).Value;
MoveNext();
return(floVal);
}
else if (this.tokens[this.index] is DoubleToken)
{
DoubleVal douVal = new DoubleVal();
douVal.Value = ((DoubleToken)this.tokens[this.index]).Value;
MoveNext();
return(douVal);
}
else if (this.tokens[this.index] is DecimalToken)
{
DecimalVal decVal = new DecimalVal();
decVal.Value = ((DecimalToken)this.tokens[this.index]).Value;
MoveNext();
return(decVal);
}
else if (this.tokens[this.index] is DateTimeToken)
{
DateTimeVal datVal = new DateTimeVal();
datVal.Value = ((DateTimeToken)this.tokens[this.index]).Value;
MoveNext();
return(datVal);
}
else if (this.tokens[this.index] is BoolToken)
{
BoolVal bolVal = new BoolVal();
bolVal.Value = ((BoolToken)this.tokens[this.index]).Value;
MoveNext();
return(bolVal);
}
else if (this.tokens[this.index] == Tokens.Null)
{
NullVal nullVal = new NullVal();
MoveNext();
return(nullVal);
}
else if (this.tokens[this.index] is IdentifierToken)
{
string ident = ((IdentifierToken)tokens[index]).Name;
MoveNext();
// function expr
if (MaybeEat(Tokens.LeftBracket))
{
FunctionExpr fun = new FunctionExpr();
fun = ParseFunction(ident);
return(fun);
}
// variable
else
{
Variable var = new Variable();
var.Ident = ident;
return(var);
}
}
else if (this.tokens[this.index] == Tokens.New)
{
MoveNext(); // eat new
return(ParseNewObject());
}
else if (this.tokens[this.index] == Tokens.LeftBracket)
{
// Eat LeftParenthesis
MoveNext();
Expr result = ParseExpr();
Eat(Tokens.RightBracket);
return(result);
}
else if (IsUnaryOperator(this.tokens[index]))
{
// Unary Expression
UnaryExpr result = new UnaryExpr();
if (MaybeEat(Tokens.Sub))
{
result.Op = TokenToBinOp(Tokens.Sub);
}
else if (MaybeEat(Tokens.Add))
{
result.Op = TokenToBinOp(Tokens.Add);
}
else if (MaybeEat(Tokens.Not))
{
result.Op = TokenToBinOp(Tokens.Not);
}
else
{
throw new System.Exception(string.Format(
"Operator '{0}' is not supported in unary expressions",
tokens[index]));
}
result.Expression = ParseFactor();
return(result);
}
else
{
throw new System.Exception("expected string literal, numeric literal, or variable");
}
}
private object CodeExecuteFunction(FunctionExpr function)
{
CodeSpecialStoreObject("_KNTERRORCODE", 0);
CodeSpecialStoreObject("_KNTERRORDESCRIPTION", "");
try
{
Type t;
object obj;
object objRoot;
string funName;
MethodInfo mi;
IdentObject ident = new IdentObject(function.FunctionName);
// Params
object[] param;
Type[] types;
if (function.Args.Count > 0)
{
param = new object[function.Args.Count];
types = new Type[function.Args.Count];
for (int i = 0; i < function.Args.Count; i++)
{
param[i] = GenExpr(function.Args[i]);
types[i] = param[i].GetType();
}
}
else
{
param = null;
types = null;
}
// Get method
if (string.IsNullOrEmpty(ident.Member))
{
t = DefaultFunctionLibraryType;
obj = DefaultFunctionLibrary;
funName = ident.RootObj;
if (types == null)
{
mi = t.GetMethod(funName, Type.EmptyTypes);
}
else
{
mi = t.GetMethod(funName, types);
}
}
else
{
if (symbolTable.ContainsKey(ident.RootObj))
{
objRoot = symbolTable[ident.RootObj];
GetObjectMethod(objRoot, ident, out obj, out mi, types);
}
// method in static class
else
{
obj = null;
GetMethodStaticClass(ident, out mi, types);
}
}
// Execute
return(mi.Invoke(obj, param));
}
catch (Exception ex)
{
if (!((bool)CodeReadSymbol(new Variable {
Ident = "_KNTERRORTRAP"
})))
{
throw;
}
else
{
CodeSpecialStoreObject("_KNTERRORCODE", 10);
CodeSpecialStoreObject("_KNTERRORDESCRIPTION", ex.Message);
return(null);
}
}
}
