예제 #1
0
        /// <summary>
        /// Builds a StatementList from a set of tokens.
        /// </summary>
        /// <param name="tokens">The array of token arrays to build from.</param>
        /// <returns>A statement list from the tokens.</returns>
        public static StatementList Build(Token[][] tokens)
        {
            var sl = new StatementList();

            for (int i = 0; i < tokens.Length; i++)
            {
                //if (tokens[i].Length > 2)
                {
                    if (tokens[i].Length > 2 && tokens[i][0] is IdentifierToken && tokens[i][1] is AssignmentToken)
                        sl.Add(new AssignmentStatement(tokens[i][0].Text, new Expression(tokens[i].SubArray(2, tokens[i].Length - 2))));
                    else if (tokens[i].Length > 2 && tokens[i][0] is IdentifierToken && tokens[i][1] is AddAssignmentToken)
                        sl.Add(new AdditionAssignmentStatement(tokens[i][0].Text, new Expression(tokens[i].SubArray(2, tokens[i].Length - 2))));
                    else if (tokens[i].Length > 2 && tokens[i][0] is IdentifierToken && tokens[i][1] is SubAssignmentToken)
                        sl.Add(new SubtractionAssignmentStatement(tokens[i][0].Text, new Expression(tokens[i].SubArray(2, tokens[i].Length - 2))));
                    if (tokens[i].Length > 2 && tokens[i][0] is IdentifierToken && tokens[i][1] is MulAssignmentToken)
                        sl.Add(new MultiplicationAssignmentStatement(tokens[i][0].Text, new Expression(tokens[i].SubArray(2, tokens[i].Length - 2))));
                    if (tokens[i].Length > 2 && tokens[i][0] is IdentifierToken && tokens[i][1] is DivAssignmentToken)
                        sl.Add(new DivisionAssignmentStatement(tokens[i][0].Text, new Expression(tokens[i].SubArray(2, tokens[i].Length - 2))));

                    else if (tokens[i].Length > 2 && tokens[i][0] is IdentifierToken && tokens[i][1] is ListStartToken)
                        sl.Add(new FunctionStatement(new Expression(tokens[i]).RootExpr as FunctionNode));
                    else if (tokens[i].Length > 1 && tokens[i][0] is ReturnToken)
                        sl.Add(new ReturnStatement(new Expression(tokens[i].SubArray(1, tokens[i].Length - 1))));
                    else if (tokens[i].Length > 4 && tokens[i][0] is DefineToken)
                    {
                        string name = tokens[i][1].Text;
                        if (!(tokens[i][2] is ListStartToken))
                            throw Err("Expected parameter list.", tokens[i][2]);

                        int ti = 3;
                        List<string> p = new List<string>();
                        while (!(tokens[i][ti] is ListEndToken))
                        {
                            if (tokens[i][ti] is ListSeperatorToken)
                                ti++;
                            p.Add(tokens[i][ti++].Text);
                        }

                        if (!(tokens[i][ti + 1] is BodyOpenToken))
                            throw Err("Expected body open.", tokens[i][ti + 1]);

                        i++;
                        List<Token[]> ftl = ReadBody(tokens, ref i);
                        //i++;
                        
                        sl.Add(new FunctionDefineStatement(name, p.ToArray(), Build(ftl.ToArray())));
                    }
                    else if (tokens[i][0] is WhileToken)
                    {
                        var conditional = new Expression(tokens[i].SubArray(1, tokens[i].Length - 2));
                        if (!(tokens[i][tokens[i].Length - 1] is BodyOpenToken))
                            throw Err("Expected body open.", tokens[i][tokens[i].Length - 1]);

                        i++;
                        List<Token[]> ftl = ReadBody(tokens, ref i);

                        sl.Add(new WhileStatement(conditional.RootExpr, Build(ftl.ToArray())));
                    }
                    else if (tokens[i][0] is ForToken)
                    {
                        if (!(tokens[i][1] is IdentifierToken))
                            throw Err("Variable name must follow for token.", tokens[i][1]);
                        var vn = tokens[i][1].Text;
                        if (!(tokens[i][2] is FromToken))
                            throw Err("From token must follow variable name.", tokens[i][2]);
                        List<Token> fromTokens = new List<Token>();
                        int n;
                        for (n = 3; n < tokens[i].Length; n++)
                            if (tokens[i][n] is ToToken)
                                break;
                            else
                                fromTokens.Add(tokens[i][n]);
                        if (n == tokens[i].Length)
                            throw Err("To token must follow From expression.", tokens[i][n]);
                        n++;

                        var fromExpr = new Expression(fromTokens.ToArray());

                        List<Token> toTokens = new List<Token>();
                        for (; n < tokens[i].Length; n++)
                            if (tokens[i][n] is BodyOpenToken || tokens[i][n] is IncToken)
                                break;
                            else
                                toTokens.Add(tokens[i][n]);
                        if (n == tokens[i].Length)
                            throw Err("Body Open token or Inc token must follow To expression.", tokens[i][n]);

                        var toExpr = new Expression(toTokens.ToArray());

                        Expression incExpr;
                        if (tokens[i][n] is IncToken)
                        {
                            n++;
                            List<Token> incTokens = new List<Token>();
                            for (; n < tokens[i].Length; n++)
                                if (tokens[i][n] is BodyOpenToken)
                                    break;
                                else
                                    incTokens.Add(tokens[i][n]);
                            if (n == tokens[i].Length)
                                throw Err("Body Open token must follow Inc expression.", tokens[i][n]);

                            incExpr = new Expression(incTokens.ToArray());
                        }
                        else
                        {
                            incExpr = new Expression(new[] { new NumberToken("1") });
                        }

                        if (!(tokens[i][n] is BodyOpenToken))
                            throw Err("Body Open token expected.", tokens[i][n]);
                        

                        i++;
                        List<Token[]> ftl = ReadBody(tokens, ref i);

                        sl.Add(new ForStatement(vn, fromExpr.RootExpr, toExpr.RootExpr, incExpr.RootExpr, Build(ftl.ToArray())));
                    }
                    else if (tokens[i][0] is IfToken)
                    {
                        var conditional = new Expression(tokens[i].SubArray(1, tokens[i].Length - 2));
                        if (!(tokens[i][tokens[i].Length - 1] is BodyOpenToken))
                            throw Err("Expected body open.", tokens[i][tokens[i].Length - 1]);

                        i++;
                        List<Token[]> ftl = ReadBody(tokens, ref i);
                        var etl = new List<Token[]>();
                        if (tokens.Length > i + 1)
                            if (tokens[i + 1].Length > 0 && tokens[i + 1][0] is ElseToken)
                            {
                                i += 2;
                                etl = ReadBody(tokens, ref i);
                            }

                        sl.Add(new IfStatement(conditional.RootExpr, Build(ftl.ToArray()), Build(etl.ToArray())));
                    }
                }
            }

            return sl;
        }
예제 #2
0
 private static Exception Err(string v, Token token)
 {
     return new StatementException(token.Line, token.Col, v);
 }
예제 #3
0
        private static List<Token[]> ReadBody(Token[][] tokens, ref int i)
        {
            int nest = 1;
            var ftl = new List<Token[]>();
            while (tokens[i].Length == 0 || !(tokens[i][0] is BodyCloseToken && nest == 1))
            {
                for (int y = 0; y < tokens[i].Length; y++)
                {
                    if (tokens[i][y] is BodyOpenToken)
                        nest++;
                    else if (tokens[i][y] is BodyCloseToken)
                        nest--;
                }
                ftl.Add(tokens[i]);
                i++;
            }

            return ftl;
        }
예제 #4
0
 private Token st(Token token)
 {
     lastToken = token;
     if (token != null)
     {
         token.Line = r.Line;
         token.Col = r.Column;
     }
     return token;
 }