Trait nyx_space::md::prelude::FromStr

1.0.0 · source ·
pub trait FromStr: Sized {
    type Err;

    // Required method
    fn from_str(s: &str) -> Result<Self, Self::Err>;
}
Expand description

Parse a value from a string

FromStr’s from_str method is often used implicitly, through str’s parse method. See parse’s documentation for examples.

FromStr does not have a lifetime parameter, and so you can only parse types that do not contain a lifetime parameter themselves. In other words, you can parse an i32 with FromStr, but not a &i32. You can parse a struct that contains an i32, but not one that contains an &i32.

§Examples

Basic implementation of FromStr on an example Point type:

use std::str::FromStr;

#[derive(Debug, PartialEq)]
struct Point {
    x: i32,
    y: i32
}

#[derive(Debug, PartialEq, Eq)]
struct ParsePointError;

impl FromStr for Point {
    type Err = ParsePointError;

    fn from_str(s: &str) -> Result<Self, Self::Err> {
        let (x, y) = s
            .strip_prefix('(')
            .and_then(|s| s.strip_suffix(')'))
            .and_then(|s| s.split_once(','))
            .ok_or(ParsePointError)?;

        let x_fromstr = x.parse::<i32>().map_err(|_| ParsePointError)?;
        let y_fromstr = y.parse::<i32>().map_err(|_| ParsePointError)?;

        Ok(Point { x: x_fromstr, y: y_fromstr })
    }
}

let expected = Ok(Point { x: 1, y: 2 });
// Explicit call
assert_eq!(Point::from_str("(1,2)"), expected);
// Implicit calls, through parse
assert_eq!("(1,2)".parse(), expected);
assert_eq!("(1,2)".parse::<Point>(), expected);
// Invalid input string
assert!(Point::from_str("(1 2)").is_err());

Required Associated Types§

1.0.0 · source

type Err

The associated error which can be returned from parsing.

Required Methods§

1.0.0 · source

fn from_str(s: &str) -> Result<Self, Self::Err>

Parses a string s to return a value of this type.

If parsing succeeds, return the value inside Ok, otherwise when the string is ill-formatted return an error specific to the inside Err. The error type is specific to the implementation of the trait.

§Examples

Basic usage with i32, a type that implements FromStr:

use std::str::FromStr;

let s = "5";
let x = i32::from_str(s).unwrap();

assert_eq!(5, x);

Object Safety§

This trait is not object safe.

Implementors§

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impl FromStr for StateParameter

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impl FromStr for TimeScale

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impl FromStr for nyx_space::time::Weekday

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impl FromStr for MonthName

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impl FromStr for IpAddr

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impl FromStr for SocketAddr

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impl FromStr for chrono::month::Month

Parsing a str into a Month uses the format %B.

§Example

use chrono::Month;

assert_eq!("January".parse::<Month>(), Ok(Month::January));
assert!("any day".parse::<Month>().is_err());

The parsing is case-insensitive.

assert_eq!("fEbruARy".parse::<Month>(), Ok(Month::February));

Only the shortest form (e.g. jan) and the longest form (e.g. january) is accepted.

assert!("septem".parse::<Month>().is_err());
assert!("Augustin".parse::<Month>().is_err());
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impl FromStr for chrono::weekday::Weekday

Parsing a str into a Weekday uses the format %A.

§Example

use chrono::Weekday;

assert_eq!("Sunday".parse::<Weekday>(), Ok(Weekday::Sun));
assert!("any day".parse::<Weekday>().is_err());

The parsing is case-insensitive.

assert_eq!("mON".parse::<Weekday>(), Ok(Weekday::Mon));

Only the shortest form (e.g. sun) and the longest form (e.g. sunday) is accepted.

assert!("thurs".parse::<Weekday>().is_err());
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impl FromStr for IpNet

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impl FromStr for log::Level

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impl FromStr for log::LevelFilter

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impl FromStr for Value

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type Err = Error

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impl FromStr for bool

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impl FromStr for char

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impl FromStr for f32

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impl FromStr for f64

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impl FromStr for i8

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impl FromStr for i16

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impl FromStr for i32

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impl FromStr for i64

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impl FromStr for i128

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impl FromStr for isize

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impl FromStr for u8

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impl FromStr for u16

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impl FromStr for u32

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impl FromStr for u64

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impl FromStr for u128

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impl FromStr for usize

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impl FromStr for TrkConfig

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impl FromStr for Duration

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impl FromStr for Epoch

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impl FromStr for Format

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impl FromStr for alloc::string::String

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impl FromStr for Ipv4Addr

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impl FromStr for Ipv6Addr

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impl FromStr for SocketAddrV4

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impl FromStr for SocketAddrV6

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impl FromStr for NonZero<i8>

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impl FromStr for NonZero<i16>

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impl FromStr for NonZero<i32>

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impl FromStr for NonZero<i64>

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impl FromStr for NonZero<i128>

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impl FromStr for NonZero<isize>

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impl FromStr for NonZero<u8>

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impl FromStr for NonZero<u16>

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impl FromStr for NonZero<u32>

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impl FromStr for NonZero<u64>

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impl FromStr for NonZero<u128>

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impl FromStr for NonZero<usize>

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impl FromStr for OsString

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impl FromStr for PathBuf

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impl FromStr for chrono::datetime::DateTime<FixedOffset>

Accepts a relaxed form of RFC3339. A space or a ‘T’ are acepted as the separator between the date and time parts. Additional spaces are allowed between each component.

All of these examples are equivalent:

"2012-12-12T12:12:12Z".parse::<DateTime<FixedOffset>>()?;
"2012-12-12 12:12:12Z".parse::<DateTime<FixedOffset>>()?;
"2012-  12-12T12:  12:12Z".parse::<DateTime<FixedOffset>>()?;
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impl FromStr for chrono::datetime::DateTime<Local>

Accepts a relaxed form of RFC3339. A space or a ‘T’ are accepted as the separator between the date and time parts.

All of these examples are equivalent:

"2012-12-12T12:12:12Z".parse::<DateTime<Local>>()?;
"2012-12-12 12:12:12Z".parse::<DateTime<Local>>()?;
"2012-12-12 12:12:12+0000".parse::<DateTime<Local>>()?;
"2012-12-12 12:12:12+00:00".parse::<DateTime<Local>>()?;
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impl FromStr for chrono::datetime::DateTime<Utc>

Accepts a relaxed form of RFC3339. A space or a ‘T’ are accepted as the separator between the date and time parts.

All of these examples are equivalent:

"2012-12-12T12:12:12Z".parse::<DateTime<Utc>>()?;
"2012-12-12 12:12:12Z".parse::<DateTime<Utc>>()?;
"2012-12-12 12:12:12+0000".parse::<DateTime<Utc>>()?;
"2012-12-12 12:12:12+00:00".parse::<DateTime<Utc>>()?;
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impl FromStr for NaiveDate

Parsing a str into a NaiveDate uses the same format, %Y-%m-%d, as in Debug and Display.

§Example

use chrono::NaiveDate;

let d = NaiveDate::from_ymd_opt(2015, 9, 18).unwrap();
assert_eq!("2015-09-18".parse::<NaiveDate>(), Ok(d));

let d = NaiveDate::from_ymd_opt(12345, 6, 7).unwrap();
assert_eq!("+12345-6-7".parse::<NaiveDate>(), Ok(d));

assert!("foo".parse::<NaiveDate>().is_err());
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impl FromStr for NaiveDateTime

Parsing a str into a NaiveDateTime uses the same format, %Y-%m-%dT%H:%M:%S%.f, as in Debug.

§Example

use chrono::{NaiveDateTime, NaiveDate};

let dt = NaiveDate::from_ymd_opt(2015, 9, 18).unwrap().and_hms_opt(23, 56, 4).unwrap();
assert_eq!("2015-09-18T23:56:04".parse::<NaiveDateTime>(), Ok(dt));

let dt = NaiveDate::from_ymd_opt(12345, 6, 7).unwrap().and_hms_milli_opt(7, 59, 59, 1_500).unwrap(); // leap second
assert_eq!("+12345-6-7T7:59:60.5".parse::<NaiveDateTime>(), Ok(dt));

assert!("foo".parse::<NaiveDateTime>().is_err());
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impl FromStr for NaiveTime

Parsing a str into a NaiveTime uses the same format, %H:%M:%S%.f, as in Debug and Display.

§Example

use chrono::NaiveTime;

let t = NaiveTime::from_hms_opt(23, 56, 4).unwrap();
assert_eq!("23:56:04".parse::<NaiveTime>(), Ok(t));

let t = NaiveTime::from_hms_nano_opt(23, 56, 4, 12_345_678).unwrap();
assert_eq!("23:56:4.012345678".parse::<NaiveTime>(), Ok(t));

let t = NaiveTime::from_hms_nano_opt(23, 59, 59, 1_234_567_890).unwrap(); // leap second
assert_eq!("23:59:60.23456789".parse::<NaiveTime>(), Ok(t));

// Seconds are optional
let t = NaiveTime::from_hms_opt(23, 56, 0).unwrap();
assert_eq!("23:56".parse::<NaiveTime>(), Ok(t));

assert!("foo".parse::<NaiveTime>().is_err());
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impl FromStr for FixedOffset

Parsing a str into a FixedOffset uses the format %z.

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impl FromStr for half::bfloat::bf16

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impl FromStr for half::binary16::f16

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impl FromStr for half::bfloat::bf16

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impl FromStr for half::binary16::f16

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impl FromStr for http::header::name::HeaderName

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impl FromStr for http::header::value::HeaderValue

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impl FromStr for http::method::Method

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impl FromStr for http::status::StatusCode

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impl FromStr for http::uri::authority::Authority

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impl FromStr for http::uri::path::PathAndQuery

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impl FromStr for http::uri::scheme::Scheme

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impl FromStr for http::uri::Uri

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impl FromStr for Ipv4Net

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impl FromStr for Ipv6Net

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impl FromStr for Mime

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impl FromStr for BigInt

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impl FromStr for BigUint

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impl FromStr for serde_json::number::Number

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type Err = Error

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impl FromStr for serde_yaml::number::Number

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type Err = Error

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impl FromStr for Url

Parse a string as an URL, without a base URL or encoding override.

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impl FromStr for MetaAlmanac

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type Err = MetaAlmanacError

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impl FromStr for Authority

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type Err = InvalidUri

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impl FromStr for BmpString

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type Err = Error

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impl FromStr for Compression

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type Err = ParquetError

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impl FromStr for ConvertedType

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type Err = ParquetError

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impl FromStr for DateTime

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type Err = Error

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impl FromStr for EnabledStatistics

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type Err = String

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impl FromStr for Encoding

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type Err = ParquetError

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impl FromStr for HeaderName

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type Err = InvalidHeaderName

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impl FromStr for HeaderValue

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type Err = InvalidHeaderValue

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impl FromStr for Level

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type Err = ParseLevelError

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impl FromStr for LevelFilter

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type Err = ParseLevelFilterError

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impl FromStr for LogicalType

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type Err = ParquetError

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impl FromStr for Method

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type Err = InvalidMethod

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impl FromStr for Month

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type Err = InvalidVariant

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impl FromStr for Name

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type Err = InvalidNameError

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impl FromStr for Name

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type Err = InvalidNameError

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impl FromStr for Name

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type Err = InvalidNameError

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impl FromStr for Parameter

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type Err = Whatever

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impl FromStr for PathAndQuery

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type Err = InvalidUri

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impl FromStr for Regex

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type Err = Error

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impl FromStr for Regex

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type Err = Error

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impl FromStr for Repetition

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type Err = ParquetError

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impl FromStr for Scheme

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type Err = InvalidUri

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impl FromStr for StatusCode

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type Err = InvalidStatusCode

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impl FromStr for TagMode

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type Err = Error

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impl FromStr for Type

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type Err = ParquetError

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impl FromStr for Tz

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type Err = ArrowError

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impl FromStr for Uri

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type Err = InvalidUri

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impl FromStr for Weekday

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type Err = InvalidVariant

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impl FromStr for WriterVersion

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type Err = String

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impl FromStr for i256

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type Err = ParseI256Error

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impl<T> FromStr for Complex<T>
where T: FromStr + Num + Clone,

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impl<T> FromStr for Ratio<T>
where T: FromStr + Clone + Integer,

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impl<T> FromStr for NotNan<T>
where T: Float + FromStr,

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type Err = ParseNotNanError<<T as FromStr>::Err>

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impl<T> FromStr for NumberPrefix<T>
where T: FromStr,

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type Err = NumberPrefixParseError

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impl<T> FromStr for OrderedFloat<T>
where T: FromStr,

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type Err = <T as FromStr>::Err

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impl<const MIN: i8, const MAX: i8> FromStr for RangedI8<MIN, MAX>

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type Err = ParseIntError

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impl<const MIN: i16, const MAX: i16> FromStr for RangedI16<MIN, MAX>

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type Err = ParseIntError

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impl<const MIN: i32, const MAX: i32> FromStr for RangedI32<MIN, MAX>

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type Err = ParseIntError

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impl<const MIN: i64, const MAX: i64> FromStr for RangedI64<MIN, MAX>

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type Err = ParseIntError

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impl<const MIN: i128, const MAX: i128> FromStr for RangedI128<MIN, MAX>

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type Err = ParseIntError

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impl<const MIN: isize, const MAX: isize> FromStr for RangedIsize<MIN, MAX>

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type Err = ParseIntError

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impl<const MIN: u8, const MAX: u8> FromStr for RangedU8<MIN, MAX>

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type Err = ParseIntError

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impl<const MIN: u16, const MAX: u16> FromStr for RangedU16<MIN, MAX>

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type Err = ParseIntError

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impl<const MIN: u32, const MAX: u32> FromStr for RangedU32<MIN, MAX>

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type Err = ParseIntError

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impl<const MIN: u64, const MAX: u64> FromStr for RangedU64<MIN, MAX>

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type Err = ParseIntError

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impl<const MIN: u128, const MAX: u128> FromStr for RangedU128<MIN, MAX>

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type Err = ParseIntError

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impl<const MIN: usize, const MAX: usize> FromStr for RangedUsize<MIN, MAX>

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type Err = ParseIntError

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impl<const N: usize> FromStr for String<N>

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type Err = ()