private static String EscapeUnicode(char c, IEscapeProvider d)
{
// escaping not defined
if (d.GetUnicodePattern() == null)
{
return(c.ToString());
}
if (!d.NeedEscapeUnicode(c))
{
return(c.ToString());
}
return(d.GetUnicodePattern().Replace(" ", ((int)c).ToString("X4")));
}
private static String CheckSuffix(String str, int start, int end, IEscapeProvider d)
{
String s;
// the length of escaping code not constant so check all variants
foreach (int j in d.GetUnescape().KeysLength)
{
if (j > end - start + 1)
{
continue;
}
s = str.Substring(end - j + 1, j);
s = UnescapeEntity(s, d);
if (s != null)
{
return(str.Substring(start, end - start - j + 1) + s);
}
}
// check unicode
if (d.GetUnicodePattern() == null)
{
return(null);
}
int p = d.GetUnicodePattern().Length + 3;
if (p > end - start + 1)
{
return(null);
}
s = str.Substring(end - p + 1, p);
s = UnescapeUnicode(s, d);
if (s != null)
{
return(str.Substring(start, end - start - p + 1) + s);
}
return(null);
}
private static String UnescapeUnicode(this String s, IEscapeProvider d)
{
String p = d.GetUnicodePattern();
if (p == null)
{
return(null);
}
if (p.Length + 3 == s.Length)
{
String hex = s.Substring(p.IndexOf(' '), 4);
ushort value;
if (ushort.TryParse(hex, NumberStyles.HexNumber, null, out value))
{
return(((char)value).ToString());
}
}
return(null);
}
private static String UnescapeUnicode(this String s, IEscapeProvider d)
{
String p = d.GetUnicodePattern();
if (p == null)
return null;
if (p.Length + 3 == s.Length)
{
String hex = s.Substring(p.IndexOf(' '), 4);
ushort value;
if (ushort.TryParse(hex, NumberStyles.HexNumber, null, out value))
return ((char)value).ToString();
}
return null;
}
private static String CheckSuffix(String str, int start, int end, IEscapeProvider d)
{
String s;
// the length of escaping code not constant so check all variants
foreach (int j in d.GetUnescape().KeysLength)
{
if (j > end - start + 1)
continue;
s = str.Substring(end - j + 1, j);
s = UnescapeEntity(s, d);
if (s != null)
return str.Substring(start, end - start - j + 1) + s;
}
// check unicode
if (d.GetUnicodePattern() == null)
return null;
int p = d.GetUnicodePattern().Length + 3;
if (p > end - start + 1)
return null;
s = str.Substring(end - p + 1, p);
s = UnescapeUnicode(s, d);
if (s != null)
return str.Substring(start, end - start - p + 1) + s;
return null;
}
private static String EscapeUnicode(char c, IEscapeProvider d)
{
// escaping not defined
if (d.GetUnicodePattern() == null)
return c.ToString();
if (!d.NeedEscapeUnicode(c))
return c.ToString();
return d.GetUnicodePattern().Replace(" ", ((int)c).ToString("X4"));
}