// NOTE: If src property is written in incorrect format (for example, contains token url(<url_content>)<some_nonsense>),
// then browser ignores it altogether and doesn't load font at all, even if there are valid tokens.
// iText will still process all split tokens and can possibly load this font in case it contains some correct urls.
/// <summary>Processes and splits a string sequence containing a url/uri</summary>
/// <param name="src">a string representing css src attribute</param>
public static String[] SplitSourcesSequence(String src)
{
IList <String> list = new List <String>();
int indexToStart = 0;
while (indexToStart < src.Length)
{
int indexToCut;
int indexUnescapedOpeningQuoteMark = Math.Min(CssUtils.FindNextUnescapedChar(src, '\'', indexToStart) >= 0
? CssUtils.FindNextUnescapedChar(src, '\'', indexToStart) : int.MaxValue, CssUtils.FindNextUnescapedChar
(src, '"', indexToStart) >= 0 ? CssUtils.FindNextUnescapedChar(src, '"', indexToStart) : int.MaxValue);
int indexUnescapedBracket = CssUtils.FindNextUnescapedChar(src, ')', indexToStart);
if (indexUnescapedOpeningQuoteMark < indexUnescapedBracket)
{
indexToCut = CssUtils.FindNextUnescapedChar(src, src[indexUnescapedOpeningQuoteMark], indexUnescapedOpeningQuoteMark
+ 1);
if (indexToCut == -1)
{
indexToCut = src.Length;
}
}
else
{
indexToCut = indexUnescapedBracket;
}
while (indexToCut < src.Length && src[indexToCut] != ',')
{
indexToCut++;
}
list.Add(src.JSubstring(indexToStart, indexToCut).Trim());
indexToStart = ++indexToCut;
}
String[] result = new String[list.Count];
list.ToArray(result);
return(result);
}
/// <summary>
/// Resolves a pseudo selector, appends it to list and updates
/// <see cref="CssSelectorParserMatch"/>
/// in process.
/// </summary>
/// <param name="selectorItems">list of items to which new selector will be added to</param>
/// <param name="pseudoSelector">the pseudo selector</param>
/// <param name="match">
/// the corresponding
/// <see cref="CssSelectorParserMatch"/>
/// that will be updated.
/// </param>
private static void AppendPseudoSelector(IList <ICssSelectorItem> selectorItems, String pseudoSelector, CssSelectorParserMatch
match)
{
pseudoSelector = pseudoSelector.ToLowerInvariant();
int start = match.GetIndex() + pseudoSelector.Length;
String source = match.GetSource();
if (start < source.Length && source[start] == '(')
{
int bracketDepth = 1;
int curr = start + 1;
while (bracketDepth > 0 && curr < source.Length)
{
if (source[curr] == '(')
{
++bracketDepth;
}
else
{
if (source[curr] == ')')
{
--bracketDepth;
}
else
{
if (source[curr] == '"' || source[curr] == '\'')
{
curr = CssUtils.FindNextUnescapedChar(source, source[curr], curr + 1);
}
}
}
++curr;
}
if (bracketDepth == 0)
{
match.Next(curr);
pseudoSelector += source.JSubstring(start, curr);
}
else
{
match.Next();
}
}
else
{
match.Next();
}
/*
* This :: notation is introduced by the current document in order to establish a discrimination between
* pseudo-classes and pseudo-elements.
* For compatibility with existing style sheets, user agents must also accept the previous one-colon
* notation for pseudo-elements introduced in CSS levels 1 and 2 (namely, :first-line, :first-letter, :before and :after).
* This compatibility is not allowed for the new pseudo-elements introduced in this specification.
*/
if (pseudoSelector.StartsWith("::"))
{
selectorItems.Add(new CssPseudoElementSelectorItem(pseudoSelector.Substring(2)));
}
else
{
if (pseudoSelector.StartsWith(":") && legacyPseudoElements.Contains(pseudoSelector.Substring(1)))
{
selectorItems.Add(new CssPseudoElementSelectorItem(pseudoSelector.Substring(1)));
}
else
{
ICssSelectorItem pseudoClassSelectorItem = CssPseudoClassSelectorItem.Create(pseudoSelector.Substring(1));
if (pseudoClassSelectorItem == null)
{
throw new ArgumentException(MessageFormatUtil.Format(iText.StyledXmlParser.LogMessageConstant.UNSUPPORTED_PSEUDO_CSS_SELECTOR
, pseudoSelector));
}
selectorItems.Add(pseudoClassSelectorItem);
}
}
}