Struct nekolib::utils::scanner::Scanner

pub struct Scanner { /* private fields */ }

スキャナ。

文字列スライスを読み、所望の型に変換する。

Examples

use std::num::ParseIntError;

use nekolib::utils::Scanner;

let mut p: Scanner = "1 2  a\nb 3".to_string().into();

assert_eq!(p.next::<i32>(), Ok(1));
assert_eq!(p.next::<i32>(), Ok(2));
// `"a"` => `ParseIntError { kind: InvalidDigit }`
assert!(p.next::<i32>().is_err());

assert_eq!(p.next::<char>(), Ok('b'));
assert_eq!(p.next::<String>(), Ok("3".to_string()));
assert_eq!(p.next::<String>(), Ok("".to_string()));

// `""` => `ParseIntError { kind: Empty }`
assert!(p.next::<i32>().is_err());
// `""` => `ParseCharError { kind: EmptyString }`
assert!(p.next::<char>().is_err());
// ok again, as `&str` => `String` never fails
assert_eq!(p.next::<String>(), Ok("".to_string()));

Implementations

impl Scanner

pub fn from_stdin() -> Result<Self, Error>

pub fn next<T: Scan>(&mut self) -> Result<T, <T as Scan>::Err>

pub fn next_m1<T>(&mut self) -> Result<T, <T as Scan>::Err>where T: Scan + Sub<Output = T> + From<u8>,

pub fn next_n<T>(&mut self, n: usize) -> Result<Vec<T>, <T as Scan>::Err>where T: Scan + Clone,

pub fn get_while<P>(&mut self, pat: P) -> &strwhere P: Fn(char) -> bool,

pub fn get_line(&mut self) -> &str

pub fn ignore(&mut self)

pub fn ignore_while<P>(&mut self, pat: P)where P: Fn(char) -> bool,

Trait Implementations

impl From<String> for Scanner

fn from(buf: String) -> Self

Converts to this type from the input type.