/// <summary>
/// Creates a parser for identifier-start-character
/// </summary>
/// <returns></returns>
public static IParser <char, char> IdentifierStartCharacter()
{
// identifier-start-character:
// letter-character
// _ (the underscore character U+005F)
// letter-character:
// A Unicode character of classes Lu, Ll, Lt, Lm, Lo, or Nl
// A unicode-escape-sequence representing a character of classes Lu, Ll, Lt, Lm, Lo, or Nl
return(Expect.Char(symbol =>
{
if (symbol == '_')
{
return true;
}
switch (CharUnicodeInfo.GetUnicodeCategory(symbol))
{
case UnicodeCategory.UppercaseLetter: //Lu
case UnicodeCategory.LowercaseLetter: //Ll
case UnicodeCategory.TitlecaseLetter: //Lt
case UnicodeCategory.ModifierLetter: //Lm
case UnicodeCategory.OtherLetter: //Lo
case UnicodeCategory.LetterNumber: //Nl
return true;
default:
return false;
}
}));
}
/// <summary>
/// Creates a parser for an identifier
/// </summary>
/// <returns>the parser</returns>
public static IParser <char, string> Identifier()
{
// identifier:
// available-identifier
// @ identifier-or-keyword
return(Expect.OneOf(
AvailableIdentifier(),
Expect.Concatenation(
Expect.Char('@'),
IdentifierOrKeyWord(),
(at, identifierOrKeyWord) => string.Concat(at, identifierOrKeyWord))
));
}
/// <summary>
/// Creates a Parser for identifier-part-character
/// </summary>
/// <returns></returns>
public static IParser <char, char> IdentifierPartCharacter()
{
// identifier-part-character:
// letter-character
// decimal-digit-character
// connecting-character
// combining-character
// formatting-character
// letter-character:
// A Unicode character of classes Lu, Ll, Lt, Lm, Lo, or Nl
// A unicode-escape-sequence representing a character of classes Lu, Ll, Lt, Lm, Lo, or Nl
// combining-character:
// A Unicode character of classes Mn or Mc
// A unicode-escape-sequence representing a character of classes Mn or Mc
// decimal-digit-character:
// A Unicode character of the class Nd
// A unicode-escape-sequence representing a character of the class Nd
// connecting-character:
// A Unicode character of the class Pc
// A unicode-escape-sequence representing a character of the class Pc
// formatting-character:
// A Unicode character of the class Cf
// A unicode-escape-sequence representing a character of the class Cf
return(Expect.Char(symbol =>
{
switch (CharUnicodeInfo.GetUnicodeCategory(symbol))
{
case UnicodeCategory.UppercaseLetter: //Lu
case UnicodeCategory.LowercaseLetter: //Ll
case UnicodeCategory.TitlecaseLetter: //Lt
case UnicodeCategory.ModifierLetter: //Lm
case UnicodeCategory.OtherLetter: //Lo
case UnicodeCategory.LetterNumber: //Nl
case UnicodeCategory.NonSpacingMark: //Mn
case UnicodeCategory.SpacingCombiningMark: //Mc
case UnicodeCategory.DecimalDigitNumber: //Nd
case UnicodeCategory.ConnectorPunctuation: //Pc
case UnicodeCategory.Format: //Cf
return true;
default:
return false;
}
}));
}
