Example #1
0
        private static bool VariableDeclaration()
        {
            if (Tokens.PeekToken().type != Token.Type.Identifier)
            {
                return(false);
            }
            if (!type())
            {
                return(false);
            }
            if (semanticPass)
            {
                SemanticActions.tExist();
            }
            Tokens.NextToken();
            currentIdentifier = Tokens.GetToken().lexeme;
            identifierToken   = Tokens.GetToken();
            Tokens.NextToken();
            if (Tokens.GetToken().lexeme == "[")
            {
                Tokens.NextToken();
                currentType = "@" + currentType;
                if (Tokens.GetToken().lexeme != "]")
                {
                    SyntaxError(Tokens.GetToken(), "]");
                }
                Tokens.NextToken();
            }
            string[] data = new string[2];
            data[0] = "returnType:" + currentType;
            data[1] = "accessMod:" + accessMod;
            Symbol symbol = new Symbol(scope, ("L" + uniqueCounter++), currentIdentifier, "lvar", data);

            identifierSymbol = symbol;
            if (semanticPass)
            {
                SemanticActions.dup(identifierToken, scope);
                SemanticActions.vPush(symbol, identifierToken, scope);
            }
            SymbolTable.Add(symbol);
            if (Tokens.GetToken().lexeme == "=")
            {
                if (semanticPass)
                {
                    SemanticActions.oPush(Tokens.GetToken());
                }
                Tokens.NextToken();
                if (!AssignmentExpression())
                {
                    SyntaxError(Tokens.GetToken(), "assignment expression");
                }
            }
            if (Tokens.GetToken().lexeme != ";")
            {
                SyntaxError(Tokens.GetToken(), ";");
            }
            if (semanticPass)
            {
                SemanticActions.EOE();
            }
            Tokens.NextToken();
            return(true);
        }
Example #2
0
        private static bool Statement()
        {
            if (Tokens.GetToken().lexeme == "{")
            {
                Tokens.NextToken();
                while (Statement())
                {
                    ;
                }
                if (Tokens.GetToken().lexeme != "}")
                {
                    SyntaxError(Tokens.GetToken(), "}");
                }
                Tokens.NextToken();
                return(true);
            }

            if (Tokens.GetToken().lexeme == "if")
            {
                Tokens.NextToken();
                if (Tokens.GetToken().lexeme != "(")
                {
                    SyntaxError(Tokens.GetToken(), "(");
                }
                if (semanticPass)
                {
                    SemanticActions.oPush(Tokens.GetToken());
                }
                Tokens.NextToken();
                if (!Expression())
                {
                    SyntaxError(Tokens.GetToken(), "an expression");
                }
                if (Tokens.GetToken().lexeme != ")")
                {
                    SyntaxError(Tokens.GetToken(), ")");
                }
                if (semanticPass)
                {
                    SemanticActions.ShuntYardAll();
                    SemanticActions.if_(Tokens.GetToken());
                }
                Tokens.NextToken();
                if (!Statement())
                {
                    SyntaxError(Tokens.GetToken(), "a statement");
                }
                if (Tokens.GetToken().lexeme == "else")
                {
                    Tokens.NextToken();
                    if (semanticPass)
                    {
                        string SKIPELSE = ICode.SKIPELSE + ICode.labelCounter++ + " ";
                        ICode.JMP(SKIPELSE);
                        ICode.StackElse(SKIPELSE);
                        ICode.Print(ICode.StackIf());
                    }
                    if (!Statement())
                    {
                        SyntaxError(Tokens.GetToken(), "a statement");
                    }
                    if (semanticPass)
                    {
                        ICode.Print(ICode.StackElse());
                    }
                }
                else if (semanticPass)
                {
                    ICode.Print(ICode.StackIf());
                }
                return(true);
            }

            if (Tokens.GetToken().lexeme == "while")
            {
                if (semanticPass)
                {
                    string BEGIN = ICode.BEGIN + ICode.labelCounter++ + " ";
                    ICode.Print(BEGIN);
                    ICode.StackWhile(BEGIN);
                }
                Tokens.NextToken();
                if (Tokens.GetToken().lexeme != "(")
                {
                    SyntaxError(Tokens.GetToken(), "(");
                }
                if (semanticPass)
                {
                    SemanticActions.oPush(Tokens.GetToken());
                }
                Tokens.NextToken();
                if (!Expression())
                {
                    SyntaxError(Tokens.GetToken(), "an expression");
                }
                if (Tokens.GetToken().lexeme != ")")
                {
                    SyntaxError(Tokens.GetToken(), ")");
                }
                if (semanticPass)
                {
                    SemanticActions.ShuntYardAll();
                    SemanticActions.while_(Tokens.GetToken());
                }
                Tokens.NextToken();
                if (!Statement())
                {
                    SyntaxError(Tokens.GetToken(), "a statement");
                }
                if (semanticPass)
                {
                    string BEGIN = ICode.StackWhile();
                    ICode.JMP(BEGIN);
                    string ENDWHILE = ICode.StackEndWhile();
                    ICode.Print(ENDWHILE);
                }
                return(true);
            }

            if (Tokens.GetToken().lexeme == "return")
            {
                Tokens.NextToken();
                Expression();
                if (Tokens.GetToken().lexeme != ";")
                {
                    SyntaxError(Tokens.GetToken(), ";");
                }
                if (semanticPass)
                {
                    SemanticActions.return_(Tokens.GetToken(), scope);
                }
                Tokens.NextToken();
                return(true);
            }

            if (Tokens.GetToken().lexeme == "cout")
            {
                Tokens.NextToken();
                if (Tokens.GetToken().lexeme != "<<")
                {
                    SyntaxError(Tokens.GetToken(), "<<");
                }
                Tokens.NextToken();
                if (!Expression())
                {
                    SyntaxError(Tokens.GetToken(), "an expression");
                }
                if (Tokens.GetToken().lexeme != ";")
                {
                    SyntaxError(Tokens.GetToken(), ";");
                }
                if (semanticPass)
                {
                    SemanticActions.cout();
                }
                Tokens.NextToken();
                return(true);
            }

            if (Tokens.GetToken().lexeme == "cin")
            {
                Tokens.NextToken();
                if (Tokens.GetToken().lexeme != ">>")
                {
                    SyntaxError(Tokens.GetToken(), ">>");
                }
                Tokens.NextToken();
                if (!Expression())
                {
                    SyntaxError(Tokens.GetToken(), "an expression");
                }
                if (Tokens.GetToken().lexeme != ";")
                {
                    SyntaxError(Tokens.GetToken(), ";");
                }
                if (semanticPass)
                {
                    SemanticActions.cin();
                }
                Tokens.NextToken();
                return(true);
            }

            if (Tokens.GetToken().lexeme == "spawn")
            {
                Tokens.NextToken();
                if (!Expression())
                {
                    SyntaxError(Tokens.GetToken(), "an expression");
                }
                if (Tokens.GetToken().lexeme != "set")
                {
                    SyntaxError(Tokens.GetToken(), "set");
                }
                Tokens.NextToken();
                if (Tokens.GetToken().type != Token.Type.Identifier)
                {
                    SyntaxError(Tokens.GetToken(), "an identifier");
                }
                if (semanticPass)
                {
                    SemanticActions.iPush(Tokens.GetToken(), scope);
                }
                Tokens.NextToken();
                if (Tokens.GetToken().lexeme != ";")
                {
                    SyntaxError(Tokens.GetToken(), ";");
                }
                if (semanticPass)
                {
                    SemanticActions.spawn();
                }
                Tokens.NextToken();
                return(true);
            }

            if (Tokens.GetToken().lexeme == "block")
            {
                Tokens.NextToken();
                if (Tokens.GetToken().lexeme != ";")
                {
                    SyntaxError(Tokens.GetToken(), ";");
                }
                if (semanticPass)
                {
                    SemanticActions.block();
                }
                Tokens.NextToken();
                return(true);
            }

            if (Tokens.GetToken().lexeme == "lock")
            {
                Tokens.NextToken();
                if (Tokens.GetToken().type != Token.Type.Identifier)
                {
                    SyntaxError(Tokens.GetToken(), "an identifier");
                }
                if (semanticPass)
                {
                    SemanticActions.iPush(Tokens.GetToken(), scope);
                }
                Tokens.NextToken();
                if (Tokens.GetToken().lexeme != ";")
                {
                    SyntaxError(Tokens.GetToken(), ";");
                }
                if (semanticPass)
                {
                    SemanticActions.lock_();
                }
                Tokens.NextToken();
                return(true);
            }

            if (Tokens.GetToken().lexeme == "release")
            {
                Tokens.NextToken();
                if (Tokens.GetToken().type != Token.Type.Identifier)
                {
                    SyntaxError(Tokens.GetToken(), "an identifier");
                }
                if (semanticPass)
                {
                    SemanticActions.iPush(Tokens.GetToken(), scope);
                }
                Tokens.NextToken();
                if (Tokens.GetToken().lexeme != ";")
                {
                    SyntaxError(Tokens.GetToken(), ";");
                }
                if (semanticPass)
                {
                    SemanticActions.release();
                }
                Tokens.NextToken();
                return(true);
            }

            if (Expression())
            {
                if (Tokens.GetToken().lexeme != ";")
                {
                    SyntaxError(Tokens.GetToken(), ";");
                }
                if (semanticPass)
                {
                    SemanticActions.EOE();
                }
                Tokens.NextToken();
                return(true);
            }
            return(false);
        }
Example #3
0
 private static bool FieldDeclaration()
 {
     if (Tokens.GetToken().lexeme == "(")
     {
         Tokens.NextToken();
         parameters = "";
         string methodType = currentType;
         offset         = 0;
         sizeParameters = 0;
         ParameterList();
         methodSize = 0;
         string[] data = new string[2];
         data[0] = "returnType:" + methodType;
         data[1] = "accessMod:" + accessMod;
         Symbol symbol = new Symbol(scope, ("M" + uniqueCounter++), currentIdentifier, "method", data);
         symbol.parameters = parameters;
         currentMethodName = "M";
         if (semanticPass)
         {
             ICode.FUNC(symbol.symid);
         }
         if (Tokens.GetToken().lexeme != ")")
         {
             SyntaxError(Tokens.GetToken(), ")");
         }
         Tokens.NextToken();
         if (!MethodBody())
         {
             SyntaxError(Tokens.GetToken(), "method body");
         }
         symbol.size = methodSize;
         SymbolTable.Add(symbol);
         offset     = 0;
         methodSize = 0;
         return(true);
     }
     else
     {
         bool flag = false;
         if (Tokens.GetToken().lexeme == "[")
         {
             flag = true;
             if (Tokens.PeekToken().lexeme != "]")
             {
                 return(false);
             }
             Tokens.NextToken();
             Tokens.NextToken();
         }
         if (semanticPass)
         {
             SemanticActions.vPush(identifierSymbol, identifierToken, scope);
         }
         if (Tokens.GetToken().lexeme == "=")
         {
             flag = true;
             if (semanticPass)
             {
                 SemanticActions.oPush(Tokens.GetToken());
             }
             Tokens.NextToken();
             if (!AssignmentExpression())
             {
                 return(false);
             }
         }
         if ((Tokens.GetToken().lexeme == ";"))
         {
             if (semanticPass)
             {
                 SemanticActions.EOE();
             }
             Tokens.NextToken();
             return(true);
         }
         if (flag)
         {
             SyntaxError(Tokens.GetToken(), ";");
         }
     }
     return(false);
 }