/// <summary>
/// 扫描 '\'（不包含 '\' 本身）之后的字符，并返回相应的正则表达式。
/// </summary>
/// <returns>相应的正则表达式。</returns>
private Regex ScanBackslash()
{
RegexCharClass cc;
int ich;
switch (ich = reader.Read())
{
case 'w':
return Regex.CharClass(
UseOptionEcma ? RegexCharClass.EcmaWordClass : RegexCharClass.WordClass);
case 'W':
return Regex.CharClass(
UseOptionEcma ? RegexCharClass.NotEcmaWordClass : RegexCharClass.NotWordClass);
case 's':
return Regex.CharClass(
UseOptionEcma ? RegexCharClass.EcmaSpaceClass : RegexCharClass.SpaceClass);
case 'S':
return Regex.CharClass(
UseOptionEcma ? RegexCharClass.NotEcmaSpaceClass : RegexCharClass.NotSpaceClass);
case 'd':
return Regex.CharClass(
UseOptionEcma ? RegexCharClass.EcmaDigitClass : RegexCharClass.DigitClass);
case 'D':
return Regex.CharClass(
UseOptionEcma ? RegexCharClass.NotEcmaDigitClass : RegexCharClass.NotDigitClass);
case 'p':
case 'P':
cc = new RegexCharClass();
cc.AddCategoryFromName(ScanProperty(), ich != 'p', UseOptionIgnoreCase, pattern);
if (UseOptionIgnoreCase)
{
cc.AddLowercase(culture);
}
return Regex.CharClass(cc.ToStringClass());
case -1:
ThrowIllegalEndEscape();
return null;
default:
reader.Unget();
char ch = ScanCharEscape();
if (UseOptionIgnoreCase)
{
return Regex.SymbolIgnoreCase(ch, culture);
}
else
{
return Regex.Symbol(ch);
}
}
}
/// <summary>
/// 扫描 '\'（不包含 '\' 本身）之后的字符，并返回相应的字符。
/// </summary>
/// <param name="rcc">要添加到的字符类。</param>
/// <param name="inRange">当前是否正在定义字符范围。</param>
/// <returns>相应的字符，如果不是字符，则为 <c>-1</c>。</returns>
private int ScanBackslash(RegexCharClass rcc, bool inRange)
{
// 判断 '\' 字符的转义。
int ich = reader.Read();
switch (ich)
{
case 'D':
case 'd':
if (inRange)
{
ThrowBadClassInCharRange((char)ich);
}
rcc.AddDigit(UseOptionEcma, ich == 'D', pattern);
return -1;
case 'S':
case 's':
if (inRange)
{
ThrowBadClassInCharRange((char)ich);
}
rcc.AddSpace(UseOptionEcma, ich == 'S');
return -1;
case 'W':
case 'w':
if (inRange)
{
ThrowBadClassInCharRange((char)ich);
}
rcc.AddWord(UseOptionEcma, ich == 'W');
return -1;
case 'p':
case 'P':
if (inRange)
{
ThrowBadClassInCharRange((char)ich);
}
rcc.AddCategoryFromName(ScanProperty(), (ich != 'p'), UseOptionIgnoreCase, pattern);
return -1;
default:
reader.Unget();
// 读入转义字符。
return ScanCharEscape();
}
}
