fn parse_statement()

in src/dialect/snowflake.rs [133:223]
75 lines of code
13 McCabe index (conditional complexity)

    fn parse_statement(&self, parser: &mut Parser) -> Option<Result<Statement, ParserError>> {
        if parser.parse_keywords(&[Keyword::ALTER, Keyword::SESSION]) {
            // ALTER SESSION
            let set = match parser.parse_one_of_keywords(&[Keyword::SET, Keyword::UNSET]) {
                Some(Keyword::SET) => true,
                Some(Keyword::UNSET) => false,
                _ => return Some(parser.expected("SET or UNSET", parser.peek_token())),
            };
            return Some(parse_alter_session(parser, set));
        }

        if parser.parse_keyword(Keyword::CREATE) {
            // possibly CREATE STAGE
            //[ OR  REPLACE ]
            let or_replace = parser.parse_keywords(&[Keyword::OR, Keyword::REPLACE]);
            // LOCAL | GLOBAL
            let global = match parser.parse_one_of_keywords(&[Keyword::LOCAL, Keyword::GLOBAL]) {
                Some(Keyword::LOCAL) => Some(false),
                Some(Keyword::GLOBAL) => Some(true),
                _ => None,
            };

            let mut temporary = false;
            let mut volatile = false;
            let mut transient = false;
            let mut iceberg = false;

            match parser.parse_one_of_keywords(&[
                Keyword::TEMP,
                Keyword::TEMPORARY,
                Keyword::VOLATILE,
                Keyword::TRANSIENT,
                Keyword::ICEBERG,
            ]) {
                Some(Keyword::TEMP | Keyword::TEMPORARY) => temporary = true,
                Some(Keyword::VOLATILE) => volatile = true,
                Some(Keyword::TRANSIENT) => transient = true,
                Some(Keyword::ICEBERG) => iceberg = true,
                _ => {}
            }

            if parser.parse_keyword(Keyword::STAGE) {
                // OK - this is CREATE STAGE statement
                return Some(parse_create_stage(or_replace, temporary, parser));
            } else if parser.parse_keyword(Keyword::TABLE) {
                return Some(parse_create_table(
                    or_replace, global, temporary, volatile, transient, iceberg, parser,
                ));
            } else {
                // need to go back with the cursor
                let mut back = 1;
                if or_replace {
                    back += 2
                }
                if temporary {
                    back += 1
                }
                for _i in 0..back {
                    parser.prev_token();
                }
            }
        }
        if parser.parse_keywords(&[Keyword::COPY, Keyword::INTO]) {
            // COPY INTO
            return Some(parse_copy_into(parser));
        }

        if let Some(kw) = parser.parse_one_of_keywords(&[
            Keyword::LIST,
            Keyword::LS,
            Keyword::REMOVE,
            Keyword::RM,
        ]) {
            return Some(parse_file_staging_command(kw, parser));
        }

        if parser.parse_keyword(Keyword::SHOW) {
            let terse = parser.parse_keyword(Keyword::TERSE);
            if parser.parse_keyword(Keyword::OBJECTS) {
                return Some(parse_show_objects(terse, parser));
            }
            //Give back Keyword::TERSE
            if terse {
                parser.prev_token();
            }
            //Give back Keyword::SHOW
            parser.prev_token();
        }

        None
    }