protected LNode GenerateSetDecl(PGIntSet set, Symbol setName)
{
var ranges = set.InternalRangeList();
IEnumerable <object> args;
Symbol method;
if (ranges.Count * 2 < set.SizeIgnoringInversion) // use ranges
{
method = _NewSetOfRanges;
args = ranges.SelectMany(r => {
if (r.Lo >= 32 && r.Hi < 0xFFFC)
{
return new object[] { (char)r.Lo, (char)r.Hi }
}
;
else
{
return new object[] { r.Lo, r.Hi }
};
});
}
else
{
method = _NewSet;
args = set.IntegerSequence(false).Select(n =>
set.IsCharSet && n >= 32 && n < 0xFFFC ? (object)(char)n : (object)(int)n);
}
return
(F.Attr(F.Id(S.Static), F.Id(S.Readonly),
F.Var(SetType, setName,
ApiCall(method, new RVList <LNode>(args.Select(a => F.Literal(a))), true))));
}
public int?ExampleInt(PGIntSet set)
{
if (set.IsCharSet && set.IsInverted && set.Contains('_'))
{
return('_');
}
if (set.ContainsEverything)
{
return(0);
}
if (set.IsEmptySet)
{
return(null);
}
int example = int.MinValue;
int min = set.IsCharSet ? 32 : 0;
foreach (var range in set.Runs())
{
example = range.Lo < min ? range.Hi : range.Lo;
if (example > min)
{
break;
}
}
return(example);
}
public override Pred CodeToPred(LNode expr, ref string errorMsg)
{
bool isInt = false;
PGIntSet set;
if (expr.IsIdNamed(_underscore))
{
set = PGIntSet.AllExceptEOF;
}
else if (expr.IsIdNamed(_EOF))
{
set = PGIntSet.EOF;
}
else if (expr.Calls(S.DotDot, 2))
{
int?from = ConstValue(expr.Args[0], ref isInt);
int?to = ConstValue(expr.Args[1], ref isInt);
if (from == null || to == null)
{
errorMsg = "Expected int32 or character literal on each side of «..»";
return(null);
}
set = PGIntSet.WithRanges(from.Value, to.Value);
}
else if (expr.Value is string)
{
return(Pred.Seq((string)expr.Value));
}
else
{
int?num = ConstValue(expr, ref isInt);
if (num == null)
{
errorMsg = "Unrecognized expression. Expected int32 or character literal instead of: " + expr.ToString(); // warning
return(null);
}
set = PGIntSet.With(num.Value);
}
set.IsCharSet = !isInt;
return(new TerminalPred(expr, set, true));
}
public static TerminalPred Chars(params char[] c)
{
var set = PGIntSet.WithChars(c.Select(ch => (int)ch).ToArray());
return(new TerminalPred(null, set));
}
public static TerminalPred Set(string set)
{
return(Set(PGIntSet.Parse(set)));
}
public int? ExampleInt(PGIntSet set)
{
if (set.IsCharSet && set.IsInverted && set.Contains('_'))
return '_';
if (set.ContainsEverything)
return 0;
if (set.IsEmptySet)
return null;
int example = int.MinValue;
int min = set.IsCharSet ? 32 : 0;
foreach (var range in set.Runs()) {
example = range.Lo < min ? range.Hi : range.Lo;
if (example > min)
break;
}
return example;
}
protected LNode GenerateSetDecl(PGIntSet set, Symbol setName)
{
var ranges = set.InternalRangeList();
IEnumerable<object> args;
Symbol method;
if (ranges.Count * 2 < set.SizeIgnoringInversion) { // use ranges
method = _NewSetOfRanges;
args = ranges.SelectMany(r => {
if (r.Lo >= 32 && r.Hi < 0xFFFC)
return new object[] { (char)r.Lo, (char)r.Hi };
else
return new object[] { r.Lo, r.Hi };
});
} else {
method = _NewSet;
args = set.IntegerSequence(false).Select(n =>
set.IsCharSet && n >= 32 && n < 0xFFFC ? (object)(char)n : (object)(int)n);
}
return
F.Attr(F.Id(S.Static), F.Id(S.Readonly),
F.Var(SetType, setName,
ApiCall(method, new RVList<LNode>(args.Select(a => F.Literal(a))), true)));
}
