private AST plusplusOrMinusminus()
{
#if WRITE_DEBUG_INFO
Console.WriteLine("plusplusOrMinusminus");
#endif
Token nameToken = match(Token.TokenType.NAME);
Token operatorToken = match(Token.TokenType.OPERATOR);
AST operationTree = null;
if (operatorToken.getTokenString() == "++")
{
operationTree = new AST(new Token(Token.TokenType.OPERATOR, "+"));
}
else if (operatorToken.getTokenString() == "--")
{
operationTree = new AST(new Token(Token.TokenType.OPERATOR, "-"));
}
else
{
throw new Exception("Error!");
}
operationTree.addChild(new AST(nameToken));
operationTree.addChild(new AST(new TokenWithValue(Token.TokenType.NUMBER, "1", new ReturnValue(1.0f))));
AST assignmentTree = new AST_Assignment(new Token(Token.TokenType.ASSIGNMENT, "="), nameToken.getTokenString());
assignmentTree.addChild(operationTree);
return(assignmentTree);
}
void checkRightHandSide(AST rhs, Token operatorToken)
{
if (rhs == null)
{
m_errorHandler.errorOccured(
"No expression on the right side of '" + operatorToken.getTokenString() + "'",
Error.ErrorType.SYNTAX, operatorToken.LineNr, operatorToken.LinePosition + 2);
}
}
private AST assignmentAndOperator()
{
#if WRITE_DEBUG_INFO
Console.WriteLine("assignment and operator");
#endif
Token nameToken = match(Token.TokenType.NAME);
Token operatorToken = match(Token.TokenType.OPERATOR);
AST expressionTree = expression();
if (expressionTree != null)
{
AST_Assignment assignmentTree = new AST_Assignment(new Token(Token.TokenType.ASSIGNMENT, "="), nameToken.getTokenString());
AST selfOperation = null;
if (operatorToken.getTokenString() == "+=")
{
selfOperation = new AST(new Token(Token.TokenType.OPERATOR, "+"));
}
else
{
throw new Error("Can't handle the operator '" + operatorToken.getTokenString() + "'",
Error.ErrorType.SYNTAX, assignmentTree.getToken().LineNr,
assignmentTree.getToken().LinePosition);
}
selfOperation.addChild(nameToken);
selfOperation.addChild(expressionTree);
assignmentTree.addChild(selfOperation);
return(assignmentTree);
}
else
{
throw new Error("The expression after " + operatorToken.getTokenString()
+ " makes no sense", Error.ErrorType.SYNTAX,
operatorToken.LineNr, operatorToken.LinePosition);
}
}
private AST_VariableDeclaration declaration()
{
#if WRITE_DEBUG_INFO
Console.WriteLine("declaration");
#endif
Token typeName = match(Token.TokenType.BUILT_IN_TYPE_NAME);
Token variableName = match(Token.TokenType.NAME);
AST_VariableDeclaration declarationTree = new AST_VariableDeclaration(
new Token(Token.TokenType.VAR_DECLARATION, "<VAR_DECL>", lookAhead(1).LineNr, lookAhead(1).LinePosition),
ReturnValue.getReturnValueTypeFromString(typeName.getTokenString()),
variableName.getTokenString());
return(declarationTree);
}
public override bool Equals(object obj)
{
if (obj is Token)
{
Token other = obj as Token;
if (this.getTokenString() == "")
{
return(m_tokenType == other.getTokenType());
}
else
{
return(m_tokenString == other.getTokenString());
}
}
return(false);
}
private AST assignment()
{
#if WRITE_DEBUG_INFO
Console.WriteLine("assignment");
#endif
Token nameToken = match(Token.TokenType.NAME);
Token assignmentToken = match(Token.TokenType.ASSIGNMENT);
AST expressionTree = expression();
if (expressionTree != null)
{
AST_Assignment assignmentTree = new AST_Assignment(assignmentToken, nameToken.getTokenString());
assignmentTree.addChild(expressionTree);
return(assignmentTree);
}
else
{
throw new Error("The expression after = makes no sense", Error.ErrorType.SYNTAX,
assignmentToken.LineNr, assignmentToken.LinePosition);
}
}
void checkRightHandSide(AST rhs, Token operatorToken)
{
if(rhs == null) {
throw new Error("No expression on the right side of '" + operatorToken.getTokenString() + "'",
Error.ErrorType.SYNTAX, operatorToken.LineNr, operatorToken.LinePosition + 2);
}
}
void checkLeftHandSide(AST lhs, Token operatorToken)
{
if(lhs == null) {
throw new Error("No expression on the left side of '" + operatorToken.getTokenString() + "'",
Error.ErrorType.SYNTAX, operatorToken.LineNr, operatorToken.LinePosition - 1);
}
}
private AST assignmentToArray()
{
#if WRITE_DEBUG_INFO
Console.WriteLine("assignment to array");
#endif
Token nameToken = null;
AST indexNode = null;
#if WRITE_DEBUG_INFO
Console.WriteLine("normal array");
#endif
nameToken = match(Token.TokenType.NAME);
match(Token.TokenType.BRACKET_LEFT);
indexNode = expression();
match(Token.TokenType.BRACKET_RIGHT);
if (lookAheadType(1) == Token.TokenType.NEW_LINE ||
lookAheadType(1) == Token.TokenType.EOF)
{
// it's a statement without assignment
return(indexNode);
}
Token assignmentToken = match(Token.TokenType.ASSIGNMENT);
AST expressionTree = expression();
if (expressionTree != null)
{
Token arrayAssignmentToken = new Token(Token.TokenType.ASSIGNMENT_TO_ARRAY, "=", assignmentToken.LineNr, assignmentToken.LinePosition);
AST_Assignment assignmentTree = new AST_Assignment(arrayAssignmentToken, nameToken.getTokenString());
assignmentTree.addChild(indexNode);
assignmentTree.addChild(expressionTree);
/*ASTPainter p = new ASTPainter();
* Console.WriteLine("---AST---");
* p.PaintAST(assignmentTree);
* Console.WriteLine("---------");*/
return(assignmentTree);
}
else
{
throw new Error("The expression after = makes no sense", Error.ErrorType.SYNTAX,
assignmentToken.LineNr, assignmentToken.LinePosition);
}
}
private AST functionCall()
{
#if WRITE_DEBUG_INFO
Console.WriteLine("function call");
#endif
Token nameToken = match(Token.TokenType.NAME);
AST functionCallTree =
new AST_FunctionCall(new Token(Token.TokenType.FUNCTION_CALL, nameToken.getTokenString(), nameToken.LineNr, nameToken.LinePosition));
match(Token.TokenType.PARANTHESIS_LEFT);
functionCallTree.getToken().LineNr = nameToken.LineNr;
functionCallTree.getToken().LinePosition = nameToken.LinePosition;
AST argumentList = new AST(new Token(Token.TokenType.NODE_GROUP, "<ARGUMENT_LIST>"));
if (lookAheadType(1) != Token.TokenType.PARANTHESIS_RIGHT)
{
while (true)
{
AST expressionTree = expression();
if (expressionTree != null)
{
argumentList.addChild(expressionTree); // add arguments as subtrees
}
else
{
throw new Error("Something is wrong with the argument list", Error.ErrorType.SYNTAX,
lookAhead(1).LineNr, lookAhead(1).LinePosition);
}
if (lookAheadType(1) == Token.TokenType.COMMA)
{
match(Token.TokenType.COMMA);
continue;
}
else
{
// Is something wrong?
if (lookAheadType(1) == Token.TokenType.NEW_LINE ||
lookAheadType(1) == Token.TokenType.EOF)
{
throw new Error("Ending parenthesis is missing in function call"
, Error.ErrorType.SYNTAX,
lookAhead(1).LineNr, lookAhead(1).LinePosition);
}
else if (lookAheadType(1) == Token.TokenType.NAME ||
lookAheadType(1) == Token.TokenType.QUOTED_STRING ||
lookAheadType(1) == Token.TokenType.NUMBER)
{
throw new Error("A comma is missing in argument list"
, Error.ErrorType.SYNTAX,
lookAhead(1).LineNr, lookAhead(1).LinePosition);
}
break;
}
}
}
match(Token.TokenType.PARANTHESIS_RIGHT);
functionCallTree.addChild(argumentList);
return(functionCallTree);
}
private AST operand()
{
#if WRITE_DEBUG_INFO
Console.WriteLine("operand");
#endif
AST operandTree = null;
if (lookAheadType(1) == Token.TokenType.NAME &&
lookAheadType(2) == Token.TokenType.PARANTHESIS_LEFT)
{
operandTree = functionCall();
}
else if (lookAheadType(1) == Token.TokenType.NAME &&
lookAheadType(2) == Token.TokenType.BRACKET_LEFT)
{
operandTree = arrayLookup();
}
else if (lookAheadType(1) == Token.TokenType.FROM)
{
operandTree = fromMinToMaxArrayCreation();
}
else if (lookAheadType(1) == Token.TokenType.NAME)
{
Token operandToken = match(Token.TokenType.NAME);
operandTree = new AST(operandToken);
}
else if (lookAheadType(1) == Token.TokenType.NUMBER)
{
Token operandToken = match(Token.TokenType.NUMBER);
float number = (float)Convert.ToDouble(operandToken.getTokenString(),
CultureInfo.InvariantCulture
);
operandTree = new AST(new TokenWithValue(operandToken.getTokenType(),
operandToken.getTokenString(),
new ReturnValue(number)));
}
else if (lookAheadType(1) == Token.TokenType.QUOTED_STRING)
{
Token operandToken = match(Token.TokenType.QUOTED_STRING);
operandTree = new AST(new TokenWithValue(operandToken.getTokenType(),
operandToken.getTokenString(),
new ReturnValue(operandToken.getTokenString())));
}
else if (lookAheadType(1) == Token.TokenType.BOOLEAN_VALUE)
{
Token operandToken = match(Token.TokenType.BOOLEAN_VALUE);
bool boolean = operandToken.getTokenString() == "true" ? true : false;
operandTree = new AST(new TokenWithValue(operandToken.getTokenType(),
operandToken.getTokenString(),
new ReturnValue(boolean)));
}
else if (lookAheadType(1) == Token.TokenType.OPERATOR &&
lookAhead(1).getTokenString() == "-")
{
operandTree = negativeExpression();
}
else if (lookAheadType(1) == Token.TokenType.BRACKET_LEFT)
{
operandTree = arrayCreation();
}
return(operandTree);
}
