public Expression ParseArithOp()
{
Expression result;
ExpressionClass operandA = ParseRelation();
result = new Expression(operandA.CodeLineNumber, operandA.CodeColumnNumber, operandA.CodeCharacterIndex);
if (NextTokenType == Token.Types.ADD || NextTokenType == Token.Types.SUB) // Second operand
{
result.Operator = Scanner.ConsumeExpressionOperator();
ExpressionClass operandB = ParseRelation();
}
return result;
}
public Expression ParseRelation()
{
Expression result;
ExpressionClass operandA = ParseTerm();
result = new Expression(operandA.CodeLineNumber, operandA.CodeColumnNumber, operandA.CodeCharacterIndex);
if (NextTokenType == Token.Types.LESSTHAN ||
NextTokenType == Token.Types.LESSTHAN_EQUAL ||
NextTokenType == Token.Types.GREATERTHAN ||
NextTokenType == Token.Types.GREATERTHAN_EQUAL ||
NextTokenType == Token.Types.EQUAL ||
NextTokenType == Token.Types.NOT_EQUAL) // Second operand
{
result.Operator = Scanner.ConsumeExpressionOperator();
ExpressionClass operandB = ParseTerm();
}
return result;
}
public Expression ParseTerm()
{
Expression result;
ExpressionClass operandA = ParseFactor();
result = new Expression(operandA.CodeLineNumber, operandA.CodeColumnNumber, operandA.CodeCharacterIndex);
if (NextTokenType == Token.Types.MUL || NextTokenType == Token.Types.DIV) // Second operand
{
result.Operator = Scanner.ConsumeExpressionOperator();
ExpressionClass operandB = ParseFactor();
}
return result;
}
public Expression ParseExpression()
{
Expression result;
if (NextTokenType == Token.Types.NOT) // Negated
{
Token notToken = Scanner.ConsumeKeywordToken(Token.Types.NOT);
result = new Expression(notToken.CodeLineNumber, notToken.CodeColumnNumber, notToken.CodeCharacterIndex);
result.Operator = Lexer.Operators.NOT;
result.OperandA = ParseArithOp();
}
else // Not negated
{
ExpressionClass operandA = ParseArithOp();
result = new Expression(operandA.CodeLineNumber, operandA.CodeColumnNumber, operandA.CodeCharacterIndex);
if (NextTokenType == Token.Types.AND || NextTokenType == Token.Types.OR) // Second operand
{
result.Operator = Scanner.ConsumeExpressionOperator();
ExpressionClass operandB = ParseArithOp();
}
}
return result;
}
