Trait messagebird_async::sms::FromStr 1.0.0[−][src]
A trait to abstract the idea of creating a new instance of a type from a string.
FromStr
's from_str
method is often used implicitly, through
str
's parse
method. See parse
's documentation for examples.
Examples
Basic implementation of FromStr
on an example Point
type:
use std::str::FromStr; use std::num::ParseIntError; #[derive(Debug, PartialEq)] struct Point { x: i32, y: i32 } impl FromStr for Point { type Err = ParseIntError; fn from_str(s: &str) -> Result<Self, Self::Err> { let coords: Vec<&str> = s.trim_matches(|p| p == '(' || p == ')' ) .split(",") .collect(); let x_fromstr = coords[0].parse::<i32>()?; let y_fromstr = coords[1].parse::<i32>()?; Ok(Point { x: x_fromstr, y: y_fromstr }) } } let p = Point::from_str("(1,2)"); assert_eq!(p.unwrap(), Point{ x: 1, y: 2} )
Associated Types
type Err
The associated error which can be returned from parsing.
Required Methods
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 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);
Implementations on Foreign Types
impl FromStr for SocketAddrV4
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impl FromStr for SocketAddrV4
type Err = AddrParseError
fn from_str(s: &str) -> Result<SocketAddrV4, AddrParseError>
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fn from_str(s: &str) -> Result<SocketAddrV4, AddrParseError>
impl FromStr for Ipv6Addr
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impl FromStr for Ipv6Addr
type Err = AddrParseError
fn from_str(s: &str) -> Result<Ipv6Addr, AddrParseError>
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fn from_str(s: &str) -> Result<Ipv6Addr, AddrParseError>
impl FromStr for Ipv4Addr
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impl FromStr for Ipv4Addr
type Err = AddrParseError
fn from_str(s: &str) -> Result<Ipv4Addr, AddrParseError>
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fn from_str(s: &str) -> Result<Ipv4Addr, AddrParseError>
impl FromStr for SocketAddr
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impl FromStr for SocketAddr
type Err = AddrParseError
fn from_str(s: &str) -> Result<SocketAddr, AddrParseError>
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fn from_str(s: &str) -> Result<SocketAddr, AddrParseError>
impl FromStr for IpAddr
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impl FromStr for IpAddr
type Err = AddrParseError
fn from_str(s: &str) -> Result<IpAddr, AddrParseError>
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fn from_str(s: &str) -> Result<IpAddr, AddrParseError>
impl FromStr for SocketAddrV6
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impl FromStr for SocketAddrV6
type Err = AddrParseError
fn from_str(s: &str) -> Result<SocketAddrV6, AddrParseError>
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fn from_str(s: &str) -> Result<SocketAddrV6, AddrParseError>
impl FromStr for u8
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impl FromStr for u8
type Err = ParseIntError
fn from_str(src: &str) -> Result<u8, ParseIntError>
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fn from_str(src: &str) -> Result<u8, ParseIntError>
impl FromStr for u64
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impl FromStr for u64
type Err = ParseIntError
fn from_str(src: &str) -> Result<u64, ParseIntError>
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fn from_str(src: &str) -> Result<u64, ParseIntError>
impl FromStr for i32
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impl FromStr for i32
type Err = ParseIntError
fn from_str(src: &str) -> Result<i32, ParseIntError>
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fn from_str(src: &str) -> Result<i32, ParseIntError>
impl FromStr for u32
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impl FromStr for u32
type Err = ParseIntError
fn from_str(src: &str) -> Result<u32, ParseIntError>
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fn from_str(src: &str) -> Result<u32, ParseIntError>
impl FromStr for i16
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impl FromStr for i16
type Err = ParseIntError
fn from_str(src: &str) -> Result<i16, ParseIntError>
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fn from_str(src: &str) -> Result<i16, ParseIntError>
impl FromStr for bool
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impl FromStr for bool
type Err = ParseBoolError
fn from_str(s: &str) -> Result<bool, ParseBoolError>
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fn from_str(s: &str) -> Result<bool, ParseBoolError>
Parse a bool
from a string.
Yields a Result<bool, ParseBoolError>
, because s
may or may not
actually be parseable.
Examples
use std::str::FromStr; assert_eq!(FromStr::from_str("true"), Ok(true)); assert_eq!(FromStr::from_str("false"), Ok(false)); assert!(<bool as FromStr>::from_str("not even a boolean").is_err());
Note, in many cases, the .parse()
method on str
is more proper.
assert_eq!("true".parse(), Ok(true)); assert_eq!("false".parse(), Ok(false)); assert!("not even a boolean".parse::<bool>().is_err());
impl FromStr for i8
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impl FromStr for i8
type Err = ParseIntError
fn from_str(src: &str) -> Result<i8, ParseIntError>
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fn from_str(src: &str) -> Result<i8, ParseIntError>
impl FromStr for usize
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impl FromStr for usize
type Err = ParseIntError
fn from_str(src: &str) -> Result<usize, ParseIntError>
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fn from_str(src: &str) -> Result<usize, ParseIntError>
impl FromStr for f64
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impl FromStr for f64
type Err = ParseFloatError
fn from_str(src: &str) -> Result<f64, ParseFloatError>
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fn from_str(src: &str) -> Result<f64, ParseFloatError>
Converts a string in base 10 to a float. Accepts an optional decimal exponent.
This function accepts strings such as
- '3.14'
- '-3.14'
- '2.5E10', or equivalently, '2.5e10'
- '2.5E-10'
- '5.'
- '.5', or, equivalently, '0.5'
- 'inf', '-inf', 'NaN'
Leading and trailing whitespace represent an error.
Arguments
- src - A string
Return value
Err(ParseFloatError)
if the string did not represent a valid
number. Otherwise, Ok(n)
where n
is the floating-point
number represented by src
.
impl FromStr for f32
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impl FromStr for f32
type Err = ParseFloatError
fn from_str(src: &str) -> Result<f32, ParseFloatError>
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fn from_str(src: &str) -> Result<f32, ParseFloatError>
Converts a string in base 10 to a float. Accepts an optional decimal exponent.
This function accepts strings such as
- '3.14'
- '-3.14'
- '2.5E10', or equivalently, '2.5e10'
- '2.5E-10'
- '5.'
- '.5', or, equivalently, '0.5'
- 'inf', '-inf', 'NaN'
Leading and trailing whitespace represent an error.
Arguments
- src - A string
Return value
Err(ParseFloatError)
if the string did not represent a valid
number. Otherwise, Ok(n)
where n
is the floating-point
number represented by src
.
impl FromStr for u128
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impl FromStr for u128
type Err = ParseIntError
fn from_str(src: &str) -> Result<u128, ParseIntError>
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fn from_str(src: &str) -> Result<u128, ParseIntError>
impl FromStr for i128
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impl FromStr for i128
type Err = ParseIntError
fn from_str(src: &str) -> Result<i128, ParseIntError>
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fn from_str(src: &str) -> Result<i128, ParseIntError>
impl FromStr for isize
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impl FromStr for isize
type Err = ParseIntError
fn from_str(src: &str) -> Result<isize, ParseIntError>
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fn from_str(src: &str) -> Result<isize, ParseIntError>
impl FromStr for char
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impl FromStr for char
impl FromStr for i64
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impl FromStr for i64
type Err = ParseIntError
fn from_str(src: &str) -> Result<i64, ParseIntError>
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fn from_str(src: &str) -> Result<i64, ParseIntError>
impl FromStr for u16
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impl FromStr for u16
type Err = ParseIntError
fn from_str(src: &str) -> Result<u16, ParseIntError>
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fn from_str(src: &str) -> Result<u16, ParseIntError>
impl FromStr for String
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impl FromStr for String
type Err = ParseError
fn from_str(s: &str) -> Result<String, ParseError>
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fn from_str(s: &str) -> Result<String, ParseError>
impl FromStr for Level
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impl FromStr for Level
impl FromStr for LevelFilter
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impl FromStr for LevelFilter
type Err = ParseLevelError
fn from_str(level: &str) -> Result<LevelFilter, <LevelFilter as FromStr>::Err>
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fn from_str(level: &str) -> Result<LevelFilter, <LevelFilter as FromStr>::Err>
impl FromStr for HeaderValue
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impl FromStr for HeaderValue
type Err = InvalidHeaderValue
fn from_str(s: &str) -> Result<HeaderValue, <HeaderValue as FromStr>::Err>
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fn from_str(s: &str) -> Result<HeaderValue, <HeaderValue as FromStr>::Err>
impl FromStr for Scheme
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impl FromStr for Scheme
impl FromStr for HeaderName
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impl FromStr for HeaderName
type Err = InvalidHeaderName
fn from_str(s: &str) -> Result<HeaderName, InvalidHeaderName>
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fn from_str(s: &str) -> Result<HeaderName, InvalidHeaderName>
impl FromStr for StatusCode
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impl FromStr for StatusCode
type Err = InvalidStatusCode
fn from_str(s: &str) -> Result<StatusCode, InvalidStatusCode>
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fn from_str(s: &str) -> Result<StatusCode, InvalidStatusCode>
impl FromStr for Method
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impl FromStr for Method
impl FromStr for Authority
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impl FromStr for Authority
type Err = InvalidUri
fn from_str(s: &str) -> Result<Authority, InvalidUri>
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fn from_str(s: &str) -> Result<Authority, InvalidUri>
impl FromStr for Uri
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impl FromStr for Uri
type Err = InvalidUri
fn from_str(s: &str) -> Result<Uri, InvalidUri>
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fn from_str(s: &str) -> Result<Uri, InvalidUri>
impl FromStr for PathAndQuery
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impl FromStr for PathAndQuery
type Err = InvalidUri
fn from_str(s: &str) -> Result<PathAndQuery, InvalidUri>
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fn from_str(s: &str) -> Result<PathAndQuery, InvalidUri>
impl FromStr for Number
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impl FromStr for Number
impl FromStr for Value
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impl FromStr for Value
impl FromStr for DateTime<Utc>
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impl FromStr for DateTime<Utc>
type Err = ParseError
fn from_str(s: &str) -> Result<DateTime<Utc>, ParseError>
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fn from_str(s: &str) -> Result<DateTime<Utc>, ParseError>
impl FromStr for NaiveTime
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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(23, 56, 4); assert_eq!("23:56:04".parse::<NaiveTime>(), Ok(t)); let t = NaiveTime::from_hms_nano(23, 56, 4, 12_345_678); assert_eq!("23:56:4.012345678".parse::<NaiveTime>(), Ok(t)); let t = NaiveTime::from_hms_nano(23, 59, 59, 1_234_567_890); // leap second assert_eq!("23:59:60.23456789".parse::<NaiveTime>(), Ok(t)); assert!("foo".parse::<NaiveTime>().is_err());
type Err = ParseError
fn from_str(s: &str) -> Result<NaiveTime, ParseError>
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fn from_str(s: &str) -> Result<NaiveTime, ParseError>
impl FromStr for Weekday
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impl FromStr for Weekday
Parsing a str
into a Weekday
uses the format %W
.
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());
impl FromStr for DateTime<FixedOffset>
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impl FromStr for DateTime<FixedOffset>
type Err = ParseError
fn from_str(s: &str) -> Result<DateTime<FixedOffset>, ParseError>
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fn from_str(s: &str) -> Result<DateTime<FixedOffset>, ParseError>
impl FromStr for NaiveDate
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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(2015, 9, 18); assert_eq!("2015-09-18".parse::<NaiveDate>(), Ok(d)); let d = NaiveDate::from_ymd(12345, 6, 7); assert_eq!("+12345-6-7".parse::<NaiveDate>(), Ok(d)); assert!("foo".parse::<NaiveDate>().is_err());
type Err = ParseError
fn from_str(s: &str) -> Result<NaiveDate, ParseError>
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fn from_str(s: &str) -> Result<NaiveDate, ParseError>
impl FromStr for DateTime<Local>
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impl FromStr for DateTime<Local>
type Err = ParseError
fn from_str(s: &str) -> Result<DateTime<Local>, ParseError>
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fn from_str(s: &str) -> Result<DateTime<Local>, ParseError>
impl FromStr for NaiveDateTime
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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(2015, 9, 18).and_hms(23, 56, 4); assert_eq!("2015-09-18T23:56:04".parse::<NaiveDateTime>(), Ok(dt)); let dt = NaiveDate::from_ymd(12345, 6, 7).and_hms_milli(7, 59, 59, 1_500); // leap second assert_eq!("+12345-6-7T7:59:60.5".parse::<NaiveDateTime>(), Ok(dt)); assert!("foo".parse::<NaiveDateTime>().is_err());
type Err = ParseError
fn from_str(s: &str) -> Result<NaiveDateTime, ParseError>
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fn from_str(s: &str) -> Result<NaiveDateTime, ParseError>
impl FromStr for Url
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impl FromStr for Url
Parse a string as an URL, without a base URL or encoding override.
type Err = ParseError
fn from_str(input: &str) -> Result<Url, ParseError>
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fn from_str(input: &str) -> Result<Url, ParseError>
impl FromStr for Regex
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impl FromStr for Regex
impl FromStr for Regex
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impl FromStr for Regex
Implementors
impl FromStr for Identifier type Err = MessageBirdError;
impl FromStr for Direction type Err = MessageBirdError;
impl FromStr for Gateway type Err = MessageBirdError;
impl FromStr for TelephoneNumber type Err = MessageBirdError;
impl FromStr for AlphaNumeric type Err = MessageBirdError;
impl FromStr for Originator type Err = MessageBirdError;
impl FromStr for PayloadType type Err = MessageBirdError;
impl FromStr for Payload type Err = MessageBirdError;
impl FromStr for Msisdn type Err = MessageBirdError;
impl FromStr for Status type Err = MessageBirdError;