pub fn build_parsed_datetime_interval(
        value: &str,
        ambiguous_resolver: DateTimeField,
    ) -> Result<ParsedDateTime, String> {
        use DateTimeField::*;

        let mut pdt = ParsedDateTime::default();
        let mut value_parts = VecDeque::new();
        let mut value_tokens = tokenize_time_str(value.trim())?;
        let mut token_buffer = VecDeque::new();

        while let Some(t) = value_tokens.pop_front() {
            match t {
                TimeStrToken::Delim => {
                    if !token_buffer.is_empty() {
                        value_parts.push_back(token_buffer.clone());
                        token_buffer.clear();
                    }
                }
                // Equivalent to trimming Colons from each leading element.
                TimeStrToken::Colon if token_buffer.is_empty() => {}
                _ => token_buffer.push_back(t),
            }
        }

        if !token_buffer.is_empty() {
            value_parts.push_back(token_buffer)
        }

        let mut annotated_parts = Vec::new();

        while let Some(part) = value_parts.pop_front() {
            let mut fmt = determine_format_w_datetimefield(part.clone())?;
            // If you cannot determine the format of this part, try to infer its
            // format.
            if fmt.is_none() {
                fmt = match value_parts.pop_front() {
                    Some(next_part) => {
                        match determine_format_w_datetimefield(next_part.clone())? {
                            Some(TimePartFormat::SqlStandard(f)) => {
                                match f {
                                    // Do not capture this token because expression
                                    // is going to fail.
                                    Year | Month | Day => None,
                                    // If following part is H:M:S, infer that this
                                    // part is Day. Because this part can use a
                                    // fraction, it should be parsed as PostgreSQL.
                                    _ => {
                                        // We can capture these annotated tokens
                                        // because expressions are commutative.
                                        annotated_parts.push(AnnotatedIntervalPart {
                                            fmt: TimePartFormat::SqlStandard(f),
                                            tokens: next_part.clone(),
                                        });
                                        Some(TimePartFormat::PostgreSql(Day))
                                    }
                                }
                            }
                            // None | Some(TimePartFormat::PostgreSQL(f))
                            // If next_fmt is TimePartFormat::PostgreSQL, that
                            // indicates that the following string was a TimeUnit,
                            // e.g. `day`, and this is where those tokens get
                            // consumed and propagated to their preceding numerical
                            // value.
                            next_fmt => next_fmt,
                        }
                    }
                    // Allow resolution of final part using ambiguous_resolver.
                    None => Some(TimePartFormat::PostgreSql(ambiguous_resolver)),
                }
            }
            match fmt {
                Some(fmt) => annotated_parts.push(AnnotatedIntervalPart {
                    fmt,
                    tokens: part.clone(),
                }),
                None => {
                    return Err("Cannot determine format of all parts. Add \
                        explicit time components, e.g. INTERVAL '1 day' or INTERVAL '1' DAY"
                        .into());
                }
            }
        }

        for mut ap in annotated_parts {
            match ap.fmt {
                TimePartFormat::SqlStandard(f) => {
                    fill_pdt_interval_sql(&mut ap.tokens, f, &mut pdt)?;
                    pdt.check_interval_bounds(f)?;
                }
                TimePartFormat::PostgreSql(f) => fill_pdt_interval_pg(&mut ap.tokens, f, &mut pdt)?,
            }

            // Consume unused TimeUnits for PG compat.
            while let Some(TimeStrToken::TimeUnit(_)) = ap.tokens.front() {
                ap.tokens.pop_front();
            }

            if !ap.tokens.is_empty() {
                return Err(format!(
                    "have unprocessed tokens {}",
                    itertools::join(ap.tokens, "").trim_end(),
                ));
            }
        }

        Ok(pdt)
    }
/// Builds a ParsedDateTime from an interval string (`value`).
///
/// # Arguments
///
/// * `value` is a PostgreSQL-compatible interval string, e.g `INTERVAL 'value'`.
/// * `ambiguous_resolver` identifies the DateTimeField of the final part
///   if it's ambiguous, e.g. in `INTERVAL '1' MONTH` '1' is ambiguous as its
///   DateTimeField, but MONTH resolves the ambiguity.
Builds a ParsedDateTime from an interval string (`value`).
Builds a ParsedDateTime from an interval string ( ` value ` ) .
pub fn build_parsed_datetime_interval(
        value: &str,
        ambiguous_resolver: DateTimeField,
    ) -> Result<ParsedDateTime, String> {
        use DateTimeField::*;
        let mut pdt = ParsedDateTime::default();
        let mut value_parts = VecDeque::new();
        let mut value_tokens = tokenize_time_str(value.trim())?;
        let mut token_buffer = VecDeque::new();
        while let Some(t) = value_tokens.pop_front() {
            match t {
                TimeStrToken::Delim => {
                    if !token_buffer.is_empty() {
                        value_parts.push_back(token_buffer.clone());
                        token_buffer.clear();
                    }
                }
                // Equivalent to trimming Colons from each leading element.
                TimeStrToken::Colon if token_buffer.is_empty() => {}
                _ => token_buffer.push_back(t),
            }
        }
        if !token_buffer.is_empty() {
            value_parts.push_back(token_buffer)
        }
        let mut annotated_parts = Vec::new();
        while let Some(part) = value_parts.pop_front() {
            let mut fmt = determine_format_w_datetimefield(part.clone())?;
            // If you cannot determine the format of this part, try to infer its
            // format.
            if fmt.is_none() {
                fmt = match value_parts.pop_front() {
                    Some(next_part) => {
                        match determine_format_w_datetimefield(next_part.clone())? {
                            Some(TimePartFormat::SqlStandard(f)) => {
                                match f {
                                    // Do not capture this token because expression
                                    // is going to fail.
                                    Year | Month | Day => None,
                                    // If following part is H:M:S, infer that this
                                    // part is Day. Because this part can use a
                                    // fraction, it should be parsed as PostgreSQL.
                                    _ => {
                                        // We can capture these annotated tokens
                                        // because expressions are commutative.
                                        annotated_parts.push(AnnotatedIntervalPart {
                                            fmt: TimePartFormat::SqlStandard(f),
                                            tokens: next_part.clone(),
                                        });
                                        Some(TimePartFormat::PostgreSql(Day))
                                    }
                                }
                            }
                            // None | Some(TimePartFormat::PostgreSQL(f))
                            // If next_fmt is TimePartFormat::PostgreSQL, that
                            // indicates that the following string was a TimeUnit,
                            // e.g. `day`, and this is where those tokens get
                            // consumed and propagated to their preceding numerical
                            // value.
                            next_fmt => next_fmt,
                        }
                    }
                    // Allow resolution of final part using ambiguous_resolver.
                    None => Some(TimePartFormat::PostgreSql(ambiguous_resolver)),
                }
            }
            match fmt {
                Some(fmt) => annotated_parts.push(AnnotatedIntervalPart {
                    fmt,
                    tokens: part.clone(),
                }),
                None => {
                    return Err("Cannot determine format of all parts. Add \
                        explicit time components, e.g. INTERVAL '1 day' or INTERVAL '1' DAY"
                        .into());
                }
            }
        }
        for mut ap in annotated_parts {
            match ap.fmt {
                TimePartFormat::SqlStandard(f) => {
                    fill_pdt_interval_sql(&mut ap.tokens, f, &mut pdt)?;
                    pdt.check_interval_bounds(f)?;
                }
                TimePartFormat::PostgreSql(f) => fill_pdt_interval_pg(&mut ap.tokens, f, &mut pdt)?,
            }
            // Consume unused TimeUnits for PG compat.
            while let Some(TimeStrToken::TimeUnit(_)) = ap.tokens.front() {
                ap.tokens.pop_front();
            }
            if !ap.tokens.is_empty() {
                return Err(format!(
                    "have unprocessed tokens {}",
                    itertools::join(ap.tokens, "").trim_end(),
                ));
            }
        }
        Ok(pdt)
    }
pub fn build_parsed_datetime_interval ( value : & str , ambiguous_resolver : DateTimeField , ) -> Result < ParsedDateTime , String > { use DateTimeField :: * ; let mut pdt = ParsedDateTime :: default ( ) ; let mut value_parts = VecDeque :: new ( ) ; let mut value_tokens = tokenize_time_str ( value . trim ( ) ) ? ; let mut token_buffer = VecDeque :: new ( ) ; while let Some ( t ) = value_tokens . pop_front ( ) { match t { TimeStrToken :: Delim => { if ! token_buffer . is_empty ( ) { value_parts . push_back ( token_buffer . clone ( ) ) ; token_buffer . clear ( ) ; } } // Equivalent to trimming Colons from each leading element. TimeStrToken :: Colon if token_buffer . is_empty ( ) => { } _ => token_buffer . push_back ( t ) , } } if ! token_buffer . is_empty ( ) { value_parts . push_back ( token_buffer ) } let mut annotated_parts = Vec :: new ( ) ; while let Some ( part ) = value_parts . pop_front ( ) { let mut fmt = determine_format_w_datetimefield ( part . clone ( ) ) ? ; // If you cannot determine the format of this part, try to infer its // format. if fmt . is_none ( ) { fmt = match value_parts . pop_front ( ) { Some ( next_part ) => { match determine_format_w_datetimefield ( next_part . clone ( ) ) ? { Some ( TimePartFormat :: SqlStandard ( f ) ) => { match f { // Do not capture this token because expression // is going to fail. Year | Month | Day => None , // If following part is H:M:S, infer that this // part is Day. Because this part can use a // fraction, it should be parsed as PostgreSQL. _ => { // We can capture these annotated tokens // because expressions are commutative. annotated_parts . push ( AnnotatedIntervalPart { fmt : TimePartFormat :: SqlStandard ( f ) , tokens : next_part . clone ( ) , } ) ; Some ( TimePartFormat :: PostgreSql ( Day ) ) } } } // None | Some(TimePartFormat::PostgreSQL(f)) // If next_fmt is TimePartFormat::PostgreSQL, that // indicates that the following string was a TimeUnit, // e.g. `day`, and this is where those tokens get // consumed and propagated to their preceding numerical // value. next_fmt => next_fmt , } } // Allow resolution of final part using ambiguous_resolver. None => Some ( TimePartFormat :: PostgreSql ( ambiguous_resolver ) ) , } } match fmt { Some ( fmt ) => annotated_parts . push ( AnnotatedIntervalPart { fmt , tokens : part . clone ( ) , } ) , None => { return Err ( " \
 " . into ( ) ) ; } } } for mut ap in annotated_parts { match ap . fmt { TimePartFormat :: SqlStandard ( f ) => { fill_pdt_interval_sql ( & mut ap . tokens , f , & mut pdt ) ? ; pdt . check_interval_bounds ( f ) ? ; } TimePartFormat :: PostgreSql ( f ) => fill_pdt_interval_pg ( & mut ap . tokens , f , & mut pdt ) ? , } // Consume unused TimeUnits for PG compat. while let Some ( TimeStrToken :: TimeUnit ( _ ) ) = ap . tokens . front ( ) { ap . tokens . pop_front ( ) ; } if ! ap . tokens . is_empty ( ) { return Err ( format ! ( " " itertools join ( ap tokens " " ) trim_end ( ) ) ) ; } } Ok ( pdt ) }
Builds a ParsedDateTime from an interval string (`value`).
Builds a ParsedDateTime from an interval string ( ` value ` ) .
value
&str
ambiguous_resolver
DateTimeField
value
&str
ambiguous_resolver
DateTimeField