public string Visit(ExprComp node)
{
var lbl = GenerateLabel();
if (node.AnchorToken.Category == TokenCategory.EQUALS)
{
return
(Line(Indent() + "ldc.i4.0")
+ VisitChildren(node)
+ Line(Indent() + "bne.un '" + lbl + "'")
+ Line(Indent() + "pop")
+ Line(Indent() + "ldc.i4 42")
+ Line(Indent() + lbl + ":"));
}
else if (node.AnchorToken.Category == TokenCategory.NOTEQUALS)
{
return
(Line(Indent() + "ldc.i4 42")
+ VisitChildren(node)
+ Line(Indent() + "bne.un '" + lbl + "'")
+ Line(Indent() + "pop")
+ Line(Indent() + "ldc.i4.0")
+ Line(Indent() + lbl + ":"));
}
return(node.ToString() + "\n" + VisitChildren(node));
}
public Node ExprComp()
{
//‹expr-rel› (‹op-comp› ‹expr-rel›)*
var n1 = ExprRel();
while (CurrentToken == TokenCategory.EQUALS || CurrentToken == TokenCategory.NOTEQUALS)
{
var n2 = new ExprComp();
if (CurrentToken == TokenCategory.EQUALS)
{
n2.AnchorToken = Expect(TokenCategory.EQUALS);
}
else
{
n2.AnchorToken = Expect(TokenCategory.NOTEQUALS);
}
n2.Add(n1);
n2.Add(ExprRel());
n1 = n2;
}
return(n1);
}
public void Visit(ExprComp node)
{
VisitChildren(node);
}
