oxedyne/fe2o3 — fe2o3_core/src/string.rs

1.6 KiB, 8 runs

created by r1870400018:120, which is this file's identity for as long as the history lasts, whatever it is later renamed to

1	use crate::{
2	prelude::*,
3	byte::B32,
4	};
5
6	use std::fmt;
7
8	/// Tests whether a static string is contained in the given slice.
9	pub fn contains_str(target: &'static str, list: &[&'static str]) -> bool {
10	for &s in list {
11	if s == target {
12	return true;
13	}
14	}
15	false
16	}
17
18	/// Inspect the Unicode value of the first characters of the given string.
19	pub fn inspect(s: &str, n: usize) {
20	for (i, c) in s.chars().enumerate() {
21	println!("Character {}: '{}' (U+{:04X})", i, c, c as u32);
22	if i >= n {
23	break;
24	}
25	}
26	}
27
28	pub trait ToHexString: std::fmt::LowerHex + Copy + Sized {
29	fn to_hex_string(&self) -> String {
30	to_hex_string(*self)
31	}
32	}
33
34	fn to_hex_string<T: std::fmt::LowerHex>(v: T) -> String {
35	let max_digits = std::mem::size_of::<T>() * 2;
36	format!("{:0width$x}", v, width = max_digits)
37	}
38
39	impl ToHexString for B32 {
40	fn to_hex_string(&self) -> String {
41	format!("{:x}", self)
42	}
43	}
44
45	impl fmt::LowerHex for B32 {
46	fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
47	for byt in &self.0 {
48	ok!(write!(f, "{:02x}", byt));
49	}
50	Ok(())
51	}
52	}
53
54	impl ToHexString for usize {
55	fn to_hex_string(&self) -> String {
56	format!("{:x}", self)
57	}
58	}
59
60	pub fn parse_hex_char(c: char) -> Outcome<u8> {
61	match c {
62	'0'..='9' => Ok(c as u8 - b'0'),
63	'a'..='f' => Ok(c as u8 - b'a' + 10),
64	'A'..='F' => Ok(c as u8 - b'A' + 10),
65	_ => Err(err!(
66	"'{}' is not a valid hexadecimal digit.", c;
67	Invalid, Input, String, Decode)),
68	}
69	}