presto-parser/src/main/java/io/prestosql/sql/parser/DelimiterLexer.java/DelimiterLexer/DelimiterLexer
class DelimiterLexer:    public DelimiterLexer(CharStream input, Set<String> delimiters)
    {
        super(input);
        this.delimiters = ImmutableSet.copyOf(delimiters);
    }