Method scanIdentifier

backend/plugin/parser/tokenizer/tokenizer.go:483–500

Assume that identifier only contains letters, underscores, digits (0-9), or dollar signs ($). See https://www.postgresql.org/docs/current/sql-syntax-lexical.html.

(delimiter rune)

// Assume that identifier only contains letters, underscores, digits (0-9), or dollar signs ($).
// See https://www.postgresql.org/docs/current/sql-syntax-lexical.html.
func (t *Tokenizer) scanIdentifier(delimiter rune) error {
	if t.char(0) != delimiter {
		return errors.Errorf("delimiter doesn't start with delimiter: %c, but found: %c", delimiter, t.char(0))
	}

	t.skip(1)
	for {
		switch t.char(0) {
		case delimiter:
			t.skip(1)
			return nil
		case eofRune:
			return errors.Errorf("invalid indentifier: not found delimiter: %c, but found EOF", delimiter)
		default:
			t.skip(1)
		}
	}
}

// There are two ways to include a single quote('), using \' or two single-quotes.
// We only handle the case \', because the second case does not require special handling.