static CSSImageValue GeneralLinearGradient(List <CSSValue> arguments, Boolean repeating)
{
if (arguments.Count > 1)
{
var direction = Angle.Zero;
var angle = arguments[0].ToAngle();
var offset = 0;
if (angle.HasValue)
{
direction = angle.Value;
offset++;
}
var stops = new CSSImageValue.GradientStop[arguments.Count - offset];
if (stops.Length > 1)
{
var perStop = 100f / (arguments.Count - offset - 1);
for (int i = offset, k = 0; i < arguments.Count; i++, k++)
{
CSSPrimitiveValue <Color> color = null;
var location = CSSCalcValue.FromPercent(new Percent(perStop * k));
if (arguments[i] is CSSValueList)
{
var list = (CSSValueList)arguments[i];
if (list.Length != 2)
{
return(null);
}
color = list[0].AsColor();
location = list[1].AsCalc();
}
else
{
color = arguments[i].AsColor();
}
if (color == null || location == null)
{
return(null);
}
stops[k] = new CSSImageValue.GradientStop(color.Value, location);
}
return(CSSImageValue.FromLinearGradient(direction, repeating, stops));
}
}
return(null);
}
Boolean CheckIdentifier(CSSPrimitiveValue ident)
{
_resets.Clear();
if (!ident.Is(Keywords.None))
{
_resets.Add(ident.GetString(), 0);
}
return(true);
}
/// <summary>
/// Creates a single value from the given source.
/// </summary>
/// <param name="source">The token iterator.</param>
/// <returns>The value or NULL.</returns>
CSSValue CreateValue(IEnumerator<CssToken> source)
{
CSSValue value = null;
switch (source.Current.Type)
{
case CssTokenType.String:// 'i am a string'
value = new CSSPrimitiveValue(UnitType.String, ((CssStringToken)source.Current).Data);
break;
case CssTokenType.Url:// url('this is a valid URL')
value = new CSSPrimitiveValue(UnitType.Uri, ((CssStringToken)source.Current).Data);
break;
case CssTokenType.Ident: // ident
value = new CSSPrimitiveValue(UnitType.Ident, ((CssKeywordToken)source.Current).Data);
break;
case CssTokenType.Percentage: // 5%
value = new CSSPrimitiveValue(UnitType.Percentage, ((CssUnitToken)source.Current).Data);
break;
case CssTokenType.Dimension: // 3px
value = new CSSPrimitiveValue(((CssUnitToken)source.Current).Unit, ((CssUnitToken)source.Current).Data);
break;
case CssTokenType.Number: // 173
value = new CSSPrimitiveValue(UnitType.Number, ((CssNumberToken)source.Current).Data);
break;
case CssTokenType.Hash: // #string
HtmlColor color;
if(HtmlColor.TryFromHex(((CssKeywordToken)source.Current).Data, out color))
value = new CSSPrimitiveValue(color);
break;
case CssTokenType.Delim: // e.g. #0F3, #012345, ...
if (((CssDelimToken)source.Current).Data == '#')
{
String hash = String.Empty;
while (source.MoveNext())
{
var stop = false;
switch (source.Current.Type)
{
case CssTokenType.Number:
case CssTokenType.Dimension:
case CssTokenType.Ident:
var rest = source.Current.ToValue();
if (hash.Length + rest.Length <= 6)
hash += rest;
else
stop = true;
break;
default:
stop = true;
break;
}
if (stop || hash.Length == 6)
break;
}
if (HtmlColor.TryFromHex(hash, out color))
value = new CSSPrimitiveValue(color);
}
break;
case CssTokenType.Function: // rgba(255, 255, 20, 0.5)
value = CreateFunction(source);
break;
}
return value;
}
/// <summary>
/// Changes the value of X Y and Z to the given value.
/// </summary>
/// <param name="value">The value to set for all values.</param>
public void ChangeAllTo(CSSPrimitiveValue value)
{
X = value;
Y = value;
Z = value;
}
/// <summary>
/// Sets the values of all sides to the given value.
/// </summary>
/// <param name="value">The value to apply.</param>
public void SetAllSides(CSSPrimitiveValue value)
{
Top = value;
Right = value;
Bottom = value;
Left = value;
}
/// <summary>
/// Sets the value for the given side.
/// </summary>
/// <param name="side">The side to change.</param>
/// <param name="value">The value to apply.</param>
public void SetSide(CssSide side, CSSPrimitiveValue value)
{
switch (side)
{
case CssSide.Top:
Top = value;
break;
case CssSide.Right:
Right = value;
break;
case CssSide.Bottom:
Bottom = value;
break;
case CssSide.Left:
Left = value;
break;
}
}