public WRC WalkExpr(Expr expr)
{
if (expr == null)
{
return(WRC.Continue);
}
C.ASSERTCOVERAGE(E.ExprHasProperty(expr, EP.TokenOnly));
C.ASSERTCOVERAGE(E.ExprHasProperty(expr, EP.Reduced));
WRC rc = ExprCallback(this, expr);
if (rc == WRC.Continue && !E.ExprHasAnyProperty(expr, EP.TokenOnly))
{
if (WalkExpr(expr.Left) != 0)
{
return(WRC.Abort);
}
if (WalkExpr(expr.Right) != 0)
{
return(WRC.Abort);
}
if (E.ExprHasProperty(expr, EP.xIsSelect))
{
if (WalkSelect(expr.x.Select) != 0)
{
return(WRC.Abort);
}
}
else
{
if (WalkExprList(expr.x.List) != 0)
{
return(WRC.Abort);
}
}
}
return(rc & WRC.Abort);
}
public WRC WalkSelect(Select p)
{
if (p == null || SelectCallback == null)
{
return(WRC.Continue);
}
WRC rc = WRC.Continue;
while (p != null)
{
rc = SelectCallback(this, p);
if (rc != 0)
{
break;
}
if (WalkSelectExpr(p) != 0 || WalkSelectFrom(p) != 0)
{
WalkerDepth--;
return(WRC.Abort);
}
p = p.Prior;
}
return(rc & WRC.Abort);
}
