public Node Expr()
{
//ExprOr --> ‹expr-and› < || ‹expr-and› >*
var n = ExprAnd();
while (CurrentToken == TokenCategory.OR)
{
var n1 = new ExprOr()
{
AnchorToken = Expect(TokenCategory.OR)
};
n1.Add(n);
n1.Add(ExprAnd());
n = n1;
}
return(n);
}
public string Visit(ExprOr node)
{
var result = "";
var truecondition = GenerateLabel();
var endcondition = GenerateLabel();
if (node.AnchorToken.Category == TokenCategory.OR)
{
foreach (var n in node)
{
result +=
Visit((dynamic)n)
+ Line(Indent() + "ldc.i4.0")
+ Line(Indent() + "bne.un '" + truecondition + "'");
}
return(result
+ Line(Indent() + "ldc.i4.0")
+ Line(Indent() + "br " + endcondition)
+ Line(Indent() + truecondition + ":")
+ Line(Indent() + "ldc.i4 42")
+ Line(Indent() + endcondition + ":"));
}
return(node.ToString() + "\n" + VisitChildren(node));
}
public void Visit(ExprOr node)
{
VisitChildren(node);
}
