ExpectCurrent() public method

public ExpectCurrent ( ) : string
return string
Esempio n. 1
0
        /// <summary>
        /// 
        /// </summary>
        /// <param name="Texts"></param>
        /// <returns></returns>
        private string Expand(string Text, Dictionary<string, string> Locals = null, HashSet<string> Used = null)
        {
            if (Used == null) Used = new HashSet<string>();
            string Output = "";
            var Tokens = new CTokenReader(new CTokenizer(Text, TokenizeSpaces: true).Tokenize());
            Tokens.MoveNextSpace();
            while (Tokens.HasMore)
            {
                bool Stringify = false;

                if (Locals != null && Tokens.Current.Raw == "##")
                {
                    Tokens.MoveNextSpace();
                }

                if (Tokens.Current.Raw == "#")
                {
                    Tokens.MoveNextSpace();
                    if (Tokens.Current.Type == CTokenType.Identifier)
                    {
                        Stringify = true;
                    }
                    else
                    {
                        Stringify = false;
                        Output += "#";
                    }
                }

                if (Tokens.Current.Type == CTokenType.Identifier)
                {
                    var CurrentIdentifier = Tokens.Current.Raw;
                    var UpdatedIdentifier = ReplaceSimpleVariable(CurrentIdentifier);
                    if (UpdatedIdentifier != CurrentIdentifier)
                    {
                        Output += UpdatedIdentifier;
                        Tokens.MoveNextSpace();
                        continue;
                    }
                    switch (CurrentIdentifier)
                    {
                        case "__VA_ARGS__":
                            CurrentIdentifier = "...";
                            break;
                    }

                    if (Locals != null && Locals.ContainsKey(CurrentIdentifier))
                    {
                        CurrentIdentifier = Locals[CurrentIdentifier];
                        if (Stringify) CurrentIdentifier = CToken.Stringify(CurrentIdentifier);
                        Output += CurrentIdentifier;
                        Tokens.MoveNextSpace();
                    }
                    else if (!Used.Contains(CurrentIdentifier) && Context.Macros.ContainsKey(CurrentIdentifier))
                    {
                        var Macro = Context.Macros[CurrentIdentifier];

                        // Constant
                        if (Macro is MacroConstant)
                        {
                            Output += Expand(Macro.Replacement, null, new HashSet<string>(Used.Concat(new[] { CurrentIdentifier })));
                            Tokens.MoveNextSpace();
                        }
                        // Function
                        else
                        {
                            Tokens.MoveNextNoSpace();
                            Tokens.ExpectCurrent("(");
                            var MacroFunction = Context.Macros[CurrentIdentifier] as MacroFunction;

                            if (MacroFunction == null)
                            {
                                throw (new Exception("Trying to call a non-function macro"));
                            }

                            //Console.WriteLine(":: {0} :: ", Text);

                            var Parameters = ParseParameterList(Tokens, JustIdentifiers: false);
                            for (int n = 0; n < Parameters.Length; n++)
                            {
                                //Console.WriteLine("  {0}", Parameters[n]);
                                Parameters[n] = Expand(Parameters[n], Locals, Used);
                                //Console.WriteLine("    -> {0}", Parameters[n]);
                            }
                            var Map = MapFunctionParameters(MacroFunction.Parameters, Parameters);

                            //foreach (var Item in Map) Console.WriteLine("{0} -> {1}", Item.Key, Item.Value);

                            Output += Expand(MacroFunction.Replacement, Map, new HashSet<string>(new[] { CurrentIdentifier }));
                        }
                    }
                    else
                    {
                        Output += CurrentIdentifier;
                        Tokens.MoveNextSpace();
                    }
                }
                else
                {
                    Output += Tokens.Current.Raw;
                    Tokens.MoveNextSpace();
                }
            }
            return Output;
        }
Esempio n. 2
0
        public int EvaluateExpressionUnary(CTokenReader Tokens)
        {
            switch (Tokens.Current.Type)
            {
                case CTokenType.Char:
                    {
                        var Value = (int)Tokens.Current.GetCharValue();
                        Tokens.MoveNextNoSpace();
                        return Value;
                    }
                case CTokenType.Integer:
                    {
                        var Value = (int)Tokens.Current.GetLongValue();
                        Tokens.MoveNextNoSpace();
                        return Value;
                    }
                case CTokenType.Float:
                    {
                        var Value = (float)Tokens.Current.GetDoubleValue();
                        Tokens.MoveNextNoSpace();
                        return (int)Value;
                    }
                case CTokenType.Identifier:
                    {
                        if (Tokens.Current.Raw == "defined")
                        {
                            Tokens.MoveNextNoSpace();
                            var Result = IsDefinedExpression(Tokens);
                            //Console.WriteLine(Result);
                            return Result ? 1 : 0;
                        }

                        Macro ValueMacro;
                        string ValueString = "";
                        int ValueInt = 0;

                        if (Macros.TryGetValue(Tokens.Current.Raw, out ValueMacro))
                        {
                            ValueString = ValueMacro.Replacement;
                        }
                        int.TryParse(ValueString, out ValueInt);

                        Tokens.MoveNextNoSpace();

                        return ValueInt;
                    }
                case CTokenType.Operator:
                    switch (Tokens.Current.Raw)
                    {
                        case "(":
                            {
                                Tokens.MoveNextNoSpace();
                                int Result = EvaluateExpression(Tokens);
                                Tokens.ExpectCurrent(")");
                                Tokens.MoveNextNoSpace();
                                return Result;
                            }
                        case "-":
                        case "!":
                        case "+":
                            {
                                var Operator = Tokens.Current.Raw;
                                Tokens.MoveNextNoSpace();
                                return UnaryOperation(Operator, EvaluateExpressionUnary(Tokens));
                            }
                        default:
                            Console.Error.WriteLine("Line: {0}", Tokens);
                            throw (new NotImplementedException(String.Format("Unknown preprocessor unary operator : {0}", Tokens.Current.Raw)));
                    }
                default:
                    {

                        ShowLine(Tokens.Current);
                        throw (new NotImplementedException(String.Format("Can't handle {0}", Tokens.Current)));
                    }
            }
        }
Esempio n. 3
0
        public bool IsDefinedExpression(CTokenReader Tokens)
        {
            if (Tokens.Current.Raw == "(")
            {
                Tokens.MoveNextNoSpace();

                var Result = IsDefinedExpression(Tokens);

                Tokens.ExpectCurrent(")");
                Tokens.MoveNextNoSpace();
                return Result;
            }

            if (Tokens.Current.Type != CTokenType.Identifier) throw (new InvalidOperationException("Error!"));

            var Identifier = Tokens.Current.Raw;
            Tokens.MoveNextNoSpace();

            //Console.WriteLine("IsDefined: {0}", Identifier);
            return Macros.ContainsKey(Identifier);
        }
Esempio n. 4
0
 /// <summary>
 /// 
 /// </summary>
 /// <param name="Context"></param>
 /// <returns></returns>
 public int EvaluateExpressionTernary(CTokenReader Tokens)
 {
     // TODO:
     var Left = EvaluateExpressionLogicalOr(Tokens);
     var Current = Tokens.Current.Raw;
     if (Current == "?")
     {
         Tokens.MoveNextNoSpace();
         var TrueCond = EvaluateExpression(Tokens);
         Tokens.ExpectCurrent(":");
         Tokens.MoveNextNoSpace();
         var FalseCond = EvaluateExpressionTernary(Tokens);
         Left = TrinaryOperation(Left, TrueCond, FalseCond);
     }
     return Left;
 }