Boolean Check(CSSValueList arguments)
{
var count = arguments.Length;
var splitIndex = arguments.Length;
for (var i = 0; i < splitIndex; i++)
{
if (arguments[i] == CSSValue.Delimiter)
{
splitIndex = i;
}
}
if (count - 1 > splitIndex + 4 || splitIndex > 4 || splitIndex == count - 1 || splitIndex == 0)
{
return(false);
}
var values = new CSSValue[4];
for (int i = 0; i < splitIndex; i++)
{
for (int j = i; j < 4; j += i + 1)
{
values[j] = arguments[i];
}
}
if (splitIndex != count)
{
var opt = new CSSValue[4];
splitIndex++;
count -= splitIndex;
for (int i = 0; i < count; i++)
{
for (int j = i; j < 4; j += i + 1)
{
opt[j] = arguments[i + splitIndex];
}
}
for (int i = 0; i < 4; i++)
{
var list = new CSSValueList(values[i]);
list.Add(opt[i]);
values[i] = list;
}
}
return(Check(values));
}
/// <summary>
/// Creates a value from the given span.
/// </summary>
/// <param name="start">The inclusive start index.</param>
/// <param name="end">The exclusive end index.</param>
/// <returns>The created value (primitive or list).</returns>
CSSValue Create(Int32 start, Int32 end)
{
if (end - start != 1)
{
var list = new CSSValueList();
for (var i = start; i < end; i++)
{
list.Add(_values[i]);
}
return(list);
}
return(_values[start]);
}
public static List <CSSValueList> ToList(this CSSValueList values)
{
var list = new List <CSSValueList>();
for (int i = 0; i < values.Length; i++)
{
var entry = new CSSValueList();
for (int j = i; j < values.Length; j++)
{
if (values[j] == CSSValue.Separator)
{
break;
}
entry.Add(values[j]);
i++;
}
list.Add(entry);
}
return(list);
}
/// <summary>
/// Determines if the given value represents a valid state of this property.
/// </summary>
/// <param name="value">The state that should be used.</param>
/// <returns>True if the state is valid, otherwise false.</returns>
protected override Boolean IsValid(CSSValue value)
{
if (value != CSSValue.Inherit)
{
var values = value as CSSValueList ?? new CSSValueList(value);
var image = new CSSValueList();
var position = new CSSValueList();
var size = new CSSValueList();
var repeat = new CSSValueList();
var attachment = new CSSValueList();
var origin = new CSSValueList();
var clip = new CSSValueList();
var color = new CSSPrimitiveValue<Color>(Color.Transparent);
var list = values.ToList();
for (int i = 0; i < list.Count; i++)
{
var entry = list[i];
var hasImage = false;
var hasPosition = false;
var hasRepeat = false;
var hasAttachment = false;
var hasBox = false;
var hasColor = i + 1 != list.Count;
for (int j = 0; j < entry.Length; j++)
{
if (!hasPosition && (entry[j].IsOneOf("top", "left", "center", "bottom", "right") || entry[j].AsCalc() != null))
{
hasPosition = true;
position.Add(entry[j]);
while (j + 1 < entry.Length && (entry[j + 1].IsOneOf("top", "left", "center", "bottom", "right") || entry[j + 1].AsCalc() != null))
position.Add(entry[++j]);
if (j + 1 < entry.Length && entry[j + 1] == CSSValue.Delimiter)
{
j += 2;
if (j < entry.Length && (entry[j].IsOneOf("auto", "contain", "cover") || entry[j].AsCalc() != null))
{
size.Add(entry[j]);
if (j + 1 < entry.Length && (entry[j + 1].Is("auto") || entry[j + 1].AsCalc() != null))
size.Add(entry[++j]);
}
else
return false;
}
else
size.Add(new CSSIdentifierValue("auto"));
continue;
}
if (!hasImage && entry[j].AsImage() != null)
{
hasImage = true;
image.Add(entry[j]);
}
else if (!hasRepeat && entry[j].IsOneOf("repeat-x", "repeat-y", "repeat", "space", "round", "no-repeat"))
{
hasRepeat = true;
repeat.Add(entry[j]);
if (j + 1 < entry.Length && entry[j + 1].IsOneOf("repeat", "space", "round", "no-repeat"))
repeat.Add(entry[++j]);
}
else if (!hasAttachment && entry[j].IsOneOf("local", "fixed", "scroll"))
{
hasAttachment = true;
attachment.Add(entry[j]);
}
else if (!hasBox && entry[j].ToBoxModel().HasValue)
{
hasBox = true;
origin.Add(entry[j]);
if (j + 1 < entry.Length && entry[j + 1].ToBoxModel().HasValue)
clip.Add(entry[++j]);
else
clip.Add(new CSSIdentifierValue("border-box"));
}
else
{
if (hasColor)
return false;
hasColor = true;
color = entry[j].AsColor();
if (color == null)
return false;
}
}
if (!hasImage)
image.Add(new CSSIdentifierValue("none"));
if (!hasPosition)
{
position.Add(new CSSIdentifierValue("center"));
size.Add(new CSSIdentifierValue("auto"));
}
if (!hasRepeat)
repeat.Add(new CSSIdentifierValue("repeat"));
if (!hasAttachment)
attachment.Add(new CSSIdentifierValue("scroll"));
if (!hasBox)
{
origin.Add(new CSSIdentifierValue("border-box"));
clip.Add(new CSSIdentifierValue("border-box"));
}
if (i + 1 < list.Count)
{
image.Add(CSSValue.Separator);
position.Add(CSSValue.Separator);
size.Add(CSSValue.Separator);
repeat.Add(CSSValue.Separator);
attachment.Add(CSSValue.Separator);
origin.Add(CSSValue.Separator);
clip.Add(CSSValue.Separator);
}
}
_image.Value = image;
_position.Value = position;
_repeat.Value = repeat;
_attachment.Value = attachment;
_origin.Value = origin;
_size.Value = size;
_clip.Value = clip;
_color.Value = color;
}
return true;
}
protected override Boolean IsValid(CSSValue value)
{
if (value != CSSValue.Inherit)
{
var values = value as CSSValueList ?? new CSSValueList(value);
var image = new CSSValueList();
var position = new CSSValueList();
var size = new CSSValueList();
var repeat = new CSSValueList();
var attachment = new CSSValueList();
var origin = new CSSValueList();
var clip = new CSSValueList();
var color = new CSSPrimitiveValue <Color>(AngleSharp.DOM.Color.Transparent);
var list = values.ToList();
for (int i = 0; i < list.Count; i++)
{
var entry = list[i];
var hasImage = false;
var hasPosition = false;
var hasRepeat = false;
var hasAttachment = false;
var hasBox = false;
var hasColor = i + 1 != list.Count;
for (int j = 0; j < entry.Length; j++)
{
if (!hasPosition && (entry[j].IsOneOf("top", "left", "center", "bottom", "right") || entry[j].AsCalc() != null))
{
hasPosition = true;
position.Add(entry[j]);
while (j + 1 < entry.Length && (entry[j + 1].IsOneOf("top", "left", "center", "bottom", "right") || entry[j + 1].AsCalc() != null))
{
position.Add(entry[++j]);
}
if (j + 1 < entry.Length && entry[j + 1] == CSSValue.Delimiter)
{
j += 2;
if (j < entry.Length && (entry[j].IsOneOf("auto", "contain", "cover") || entry[j].AsCalc() != null))
{
size.Add(entry[j]);
if (j + 1 < entry.Length && (entry[j + 1].Is("auto") || entry[j + 1].AsCalc() != null))
{
size.Add(entry[++j]);
}
}
else
{
return(false);
}
}
else
{
size.Add(new CSSIdentifierValue("auto"));
}
continue;
}
if (!hasImage && entry[j].AsImage() != null)
{
hasImage = true;
image.Add(entry[j]);
}
else if (!hasRepeat && entry[j].IsOneOf("repeat-x", "repeat-y", "repeat", "space", "round", "no-repeat"))
{
hasRepeat = true;
repeat.Add(entry[j]);
if (j + 1 < entry.Length && entry[j + 1].IsOneOf("repeat", "space", "round", "no-repeat"))
{
repeat.Add(entry[++j]);
}
}
else if (!hasAttachment && entry[j].IsOneOf("local", "fixed", "scroll"))
{
hasAttachment = true;
attachment.Add(entry[j]);
}
else if (!hasBox && entry[j].ToBoxModel().HasValue)
{
hasBox = true;
origin.Add(entry[j]);
if (j + 1 < entry.Length && entry[j + 1].ToBoxModel().HasValue)
{
clip.Add(entry[++j]);
}
else
{
clip.Add(new CSSIdentifierValue("border-box"));
}
}
else
{
if (hasColor)
{
return(false);
}
hasColor = true;
color = entry[j].AsColor();
if (color == null)
{
return(false);
}
}
}
if (!hasImage)
{
image.Add(new CSSIdentifierValue("none"));
}
if (!hasPosition)
{
position.Add(new CSSIdentifierValue("center"));
size.Add(new CSSIdentifierValue("auto"));
}
if (!hasRepeat)
{
repeat.Add(new CSSIdentifierValue("repeat"));
}
if (!hasAttachment)
{
attachment.Add(new CSSIdentifierValue("scroll"));
}
if (!hasBox)
{
origin.Add(new CSSIdentifierValue("border-box"));
clip.Add(new CSSIdentifierValue("border-box"));
}
if (i + 1 < list.Count)
{
image.Add(CSSValue.Separator);
position.Add(CSSValue.Separator);
size.Add(CSSValue.Separator);
repeat.Add(CSSValue.Separator);
attachment.Add(CSSValue.Separator);
origin.Add(CSSValue.Separator);
clip.Add(CSSValue.Separator);
}
}
_image.Value = image;
_position.Value = position;
_repeat.Value = repeat;
_attachment.Value = attachment;
_origin.Value = origin;
_size.Value = size;
_clip.Value = clip;
_color.Value = color;
}
return(true);
}