private NVExpression ParseNVTerm()
{
// NVTerm -> NVFactor { NVMulOp NVFactor }.
NVExpression expr = ParseNVFactor();
while (CurrentTokenIn(TokenType.NVMul, TokenType.NVDiv, TokenType.NVMod))
{
expr = new NVBinaryExpression(ParseNVMulOp(), expr, ParseNVFactor());
expr.Position = new Position((NVBinaryExpression)expr);
}
return expr;
}
private NVExpression ParseNVRelExpression()
{
// NVRelExpression -> NVSimpleExpression [ NVRelOp NVSimpleExpression ].
NVExpression expr = ParseNVSimpleExpression();
if (CurrentTokenIn(TokenType.NVLte, TokenType.NVLt, TokenType.NVGt, TokenType.NVGte,
TokenType.NVEqEq, TokenType.NVNeq))
{
expr = new NVBinaryExpression(ParseNVRelOp(), expr, ParseNVSimpleExpression());
expr.Position = new Position((NVBinaryExpression)expr);
}
return expr;
}
private NVExpression ParseNVSimpleExpression()
{
// NVSimpleExpression -> NVTerm { NVAddOp NVTerm }.
NVExpression expr = ParseNVTerm();
while (CurrentTokenIn(TokenType.NVPlus, TokenType.NVMinus))
{
expr = new NVBinaryExpression(ParseNVAddOp(), expr, ParseNVTerm());
expr.Position = new Position((NVBinaryExpression)expr);
}
return expr;
}
private NVExpression ParseNVExpression()
{
// NVExpression -> NVAndExpression { ( "||" | "or" ) NVAndExpression }.
NVExpression expr = ParseNVAndExpression();
while (CurrentTokenType == TokenType.NVOr)
{
_scanner.GetToken();
expr = new NVBinaryExpression(Operator.Or, expr, ParseNVAndExpression());
expr.Position = new Position((NVBinaryExpression)expr);
}
return expr;
}