lozizol/model/vuint/
parse.rs

1use super::{Vuint, VuintError};
2use fmt::Debug;
3use std::{fmt, str};
4
5impl str::FromStr for Vuint<'static> {
6    type Err = ParseError;
7
8    fn from_str(s: &str) -> Result<Self, Self::Err> {
9        match s.as_bytes() {
10            [b'0', b'x', ..] | [b'0', b'X', ..] => {
11                if let Ok(bytes) = hex::decode(&s[2..]) {
12                    Ok(Vuint::try_from_bytes(bytes)?)
13                } else {
14                    Err(ParseError::InvalidHex)
15                }
16            }
17            _ => Err(ParseError::UnrecognizedInput),
18        }
19    }
20}
21
22/// Error when parsing vuint from string
23#[derive(Debug, Copy, Clone, Eq, PartialEq)]
24pub enum ParseError {
25    InvalidHex,
26    UnrecognizedInput,
27    ConversionError(VuintError),
28}
29
30impl From<VuintError> for ParseError {
31    fn from(e: VuintError) -> Self {
32        ParseError::ConversionError(e)
33    }
34}
35
36impl fmt::Display for ParseError {
37    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
38        match self {
39            ParseError::ConversionError(e) => write!(f, " {}", e),
40            ParseError::InvalidHex => write!(f, "Vuint parse error: hexadecimal value is invalid"),
41            ParseError::UnrecognizedInput => {
42                write!(f, "Vuint parse error: unrecognized input, try prefix the value with format, such as 0x...")
43            }
44        }
45    }
46}
47
48impl std::error::Error for ParseError {}
49
50#[test]
51fn test_parse_vuint() {
52    k9::assert_equal!("0x817F".parse::<Vuint>().unwrap(), Vuint::from(&255u8));
53}
54
55#[test]
56fn fail_test_parse_vuint_unrecognized() {
57    k9::assert_equal!("817F".parse::<Vuint>(), Err(ParseError::UnrecognizedInput));
58}
59
60#[test]
61fn fail_test_parse_vuint_invalid_hex() {
62    k9::assert_equal!("0x817_".parse::<Vuint>(), Err(ParseError::InvalidHex));
63    k9::assert_equal!("0x817".parse::<Vuint>(), Err(ParseError::InvalidHex));
64    k9::assert_equal!("0x817z".parse::<Vuint>(), Err(ParseError::InvalidHex));
65}
lozizol/model/vuint/parse.rs

lozizol/model/vuint/
parse.rs
