public void Encode(ASTDifference node)
{
NumExpr rhs = m_stack.Pop();
NumExpr lhs = m_stack.Pop();
m_stack.Push(new NumExpr(lhs.IsTrueValue && rhs.IsTrueValue, lhs.Value - rhs.Value, String.Format("{0} - {1}", lhs.Code, rhs.Code)));
}
//<Num Expr> ::= <Num Expr> '+' <Num Term>
// | <Num Expr> '-' <Num Term>
// | <Num Term>
private ASTNode GetNumExpr(string scaleName, NumericType numType)
{
ASTNode lhs = GetNumTerm(scaleName, numType);
if (lhs == null)
{
return(null);
}
while ((m_symbol == Lexer.Symbol.Plus) || (m_symbol == Lexer.Symbol.Minus))
{
Lexer.Symbol operation = m_symbol;
GetToken();
ASTNode rhs = GetNumTerm(scaleName, numType);
if (rhs == null)
{
return(null);
}
else if (operation == Lexer.Symbol.Plus)
{
lhs = new ASTSum(lhs, rhs);
}
else
{
lhs = new ASTDifference(lhs, rhs);
}
}
return(lhs);
}
public void Encode(ASTDifference node)
{
throw new NotImplementedException(String.Format(s_notImplementedTypeEncoding, node.GetType().FullName));
}
