Method scanClassSetCharacter

internal/scanner/regexp.go:808–838

ClassSetCharacter ::= | SourceCharacter -- ClassSetSyntaxCharacter -- ClassSetReservedDoublePunctuator | '\' (CharacterEscape | ClassSetReservedPunctuator | 'b')

()

//	| SourceCharacter -- ClassSetSyntaxCharacter -- ClassSetReservedDoublePunctuator
//	| '\' (CharacterEscape | ClassSetReservedPunctuator | 'b')
func (p *regExpParser) scanClassSetCharacter() string {
	ch := p.char()
	if ch == '\\' {
		p.incPos(1)
		innerCh := p.char()
		switch innerCh {
		case 'b':
			p.incPos(1)
			return "\b"
		case '&', '-', '!', '#', '%', ',', ':', ';', '<', '=', '>', '@', '`', '~':
			p.incPos(1)
			return string(innerCh)
		default:
			return p.scanCharacterEscape(false /*atomEscape*/)
		}
	} else if p.pos()+1 < p.end && ch == p.charAt(p.pos()+1) {
		switch ch {
		case '&', '!', '#', '%', '*', '+', ',', '.', ':', ';', '<', '=', '>', '?', '@', '`', '~':
			p.error(diagnostics.A_character_class_must_not_contain_a_reserved_double_punctuator_Did_you_mean_to_escape_it_with_backslash, p.pos(), 2)
			p.incPos(2)
			return p.text()[p.pos()-2 : p.pos()]
		}
	}
	switch ch {
	case '/', '(', ')', '[', ']', '{', '}', '-', '|':
		p.error(diagnostics.Unexpected_0_Did_you_mean_to_escape_it_with_backslash, p.pos(), 1, string(ch))
		p.incPos(1)
		return string(ch)
	}
	return p.scanSourceCharacter()
}

// ClassAtom ::=
//