private bool ParseMediaValue(Block token)
{
switch (token.GrammarSegment)
{
case GrammarSegment.CurlyBraceOpen:
case GrammarSegment.Semicolon:
{
var container = CurrentRule as ISupportsMedia;
if (container != null)
{
container.Media.AppendMedium(_mediaDefn);
}
if (CurrentRule is ImportRule)
{
return ParsePostInstruction(token);
}
SetParsingContext(ParsingContext.DataBlock);
_mediaDefn = null;
return token.GrammarSegment == GrammarSegment.CurlyBraceOpen;
}
case GrammarSegment.Comma:
{
var container = CurrentRule as ISupportsMedia;
if (container != null)
{
container.Media.AppendMedium(_mediaDefn);
}
_mediaDefn = null;
return true;
}
case GrammarSegment.Whitespace:
{
// Do Nothing
return true;
}
default:
{
if (_mediaDefn == null) _mediaDefn = new MediaDefinition();
switch (token.ToString())
{
case "only":
_mediaDefn.Modifier = MediaTypeModifier.Only;
break;
case "not":
_mediaDefn.Modifier = MediaTypeModifier.Not;
break;
case "screen":
_mediaDefn.Type = MediaType.Screen;
break;
case "speech":
_mediaDefn.Type = MediaType.Speech;
break;
case "print":
_mediaDefn.Type = MediaType.Print;
break;
case "all":
_mediaDefn.Type = MediaType.All;
break;
case "braille":
_mediaDefn.Type = MediaType.Braille;
break;
case "embossed":
_mediaDefn.Type = MediaType.Embossed;
break;
case "handheld":
_mediaDefn.Type = MediaType.Handheld;
break;
case "projection":
_mediaDefn.Type = MediaType.Projection;
break;
case "tty":
_mediaDefn.Type = MediaType.Tty;
break;
case "tv":
_mediaDefn.Type = MediaType.Tv;
break;
case "and":
// do nothing
break;
case "(":
_mediaProp = new MediaProperty();
break;
case ")":
if (_mediaProp != null)
{
var plain = _mediaProp as MediaPropertyPlain;
if (plain != null && _terms.Length == 1)
{
plain.Value = _terms[0];
}
else if (!string.IsNullOrEmpty(_compare1) && _terms.Length > 0)
{
var range = new MediaPropertyRange { Name = _mediaProp.Name };
if (_nameFirst)
{
if (_compare1.StartsWith("<"))
{
range.UpperBound = _terms[0];
range.UpperCompare = _compare1;
}
else
{
range.LowerBound = _terms[0];
range.LowerCompare = _compare1.Replace('>', '<');
}
}
else
{
if (_terms.Length == 1)
{
if (_compare1.StartsWith(">"))
{
range.UpperBound = _terms[0];
range.UpperCompare = _compare1.Replace('>', '<');
}
else
{
range.LowerBound = _terms[0];
range.LowerCompare = _compare1;
}
}
else
{
if (_compare1.StartsWith("<"))
{
range.LowerBound = _terms[0];
range.LowerCompare = _compare1;
range.UpperBound = _terms[1];
range.UpperCompare = _compare2;
}
else
{
range.UpperBound = _terms[0];
range.UpperCompare = _compare1.Replace('>', '<');
range.LowerBound = _terms[1];
range.LowerCompare = _compare2.Replace('>', '<');
}
}
}
_mediaProp = range;
}
_mediaDefn.Properties.Add(_mediaProp);
}
_compare1 = null;
_compare2 = null;
_mediaProp = null;
_terms = new TermList();
break;
case ":":
if (_mediaProp != null) _mediaProp = new MediaPropertyPlain { Name = _mediaProp.Name };
break;
case "<":
case ">":
if (string.IsNullOrEmpty(_compare1))
_compare1 = token.ToString();
else
_compare2 = token.ToString();
break;
case "=":
if (string.IsNullOrEmpty(_compare1) || (string.IsNullOrEmpty(_compare2) && _compare1 != "="))
_compare1 = (_compare1 ?? "") + token.ToString();
else
_compare2 = (_compare2 ?? "") + token.ToString();
break;
default:
if (token.GrammarSegment == GrammarSegment.Ident && string.IsNullOrEmpty(_mediaProp.Name))
{
_mediaProp.Name = token.ToString();
_nameFirst = string.IsNullOrEmpty(_compare1);
}
else
{
ParseSingleValue(token);
}
break;
}
return true;
}
}
}
private static bool MediaMatches(MediaDefinition d, GlobalStyleContext settings)
{
var context = new StyleContext();
var result = (d.Modifier != MediaTypeModifier.Not && (d.Type & settings.Media) > 0) ||
(d.Modifier == MediaTypeModifier.Not && (d.Type & settings.Media) == 0);
if (result)
{
var width = d.Properties.Where(p => string.Compare(p.Name, "width", StringComparison.OrdinalIgnoreCase) == 0 ||
p.Name.EndsWith("-width", StringComparison.OrdinalIgnoreCase));
var plainProps = width.OfType<MediaPropertyPlain>();
double px;
foreach (var plain in plainProps)
{
px = ToPx(plain.Value as PrimitiveTerm, context, false);
if (plain.Name.StartsWith("max-", StringComparison.OrdinalIgnoreCase) && px > settings.MediaWidth) return false;
if (plain.Name.StartsWith("min-", StringComparison.OrdinalIgnoreCase) && px < settings.MediaWidth) return false;
}
var rangeProps = width.OfType<MediaPropertyRange>();
foreach (var range in rangeProps)
{
if (range.LowerBound != null)
{
px = ToPx(range.LowerBound as PrimitiveTerm, context, false);
if (settings.MediaWidth < px || (settings.MediaWidth == px && !range.LowerCompare.EndsWith("="))) return false;
}
if (range.UpperBound != null)
{
px = ToPx(range.UpperBound as PrimitiveTerm, context, false);
if (settings.MediaWidth > px || (settings.MediaWidth == px && !range.UpperCompare.EndsWith("="))) return false;
}
}
}
return result;
}
