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https://github.com/darwincereska/envkit.git
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darwincereska
46 lines
1.3 KiB
Rust
46 lines
1.3 KiB
Rust
use std::fmt::Display;
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use std::any::type_name;
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use crate::error::EnvError;
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use std::str::FromStr;
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/// A trait for types that can be parsed from a string as a number.
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pub trait Number: FromStr<Err: Display> {}
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impl Number for i8 {}
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impl Number for i16 {}
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impl Number for i32 {}
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impl Number for i64 {}
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impl Number for i128 {}
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impl Number for isize {}
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impl Number for u8 {}
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impl Number for u16 {}
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impl Number for u32 {}
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impl Number for u64 {}
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impl Number for u128 {}
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impl Number for usize {}
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impl Number for f32 {}
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impl Number for f64 {}
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/// Parses a string as a boolean value.
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pub fn parse_bool(value: &str) -> Result<bool, EnvError> {
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if value.to_lowercase() == "t" { return Ok(true) }
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if value.to_lowercase() == "f" { return Ok(false) }
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if value == "1" { return Ok(true) }
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if value == "0" { return Ok(false) }
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if value == "yes" { return Ok(true) }
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if value == "no" { return Ok(false) }
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match value.parse::<bool>() {
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Ok(value) => Ok(value),
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Err(e) => Err(EnvError::invalid("bool", value, &e.to_string()))
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}
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}
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/// Parses a string as a number of the specified type.
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pub fn parse_number<T: Number>(value: &str) -> Result<T, EnvError> {
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match value.parse::<T>() {
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Ok(value) => Ok(value),
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Err(e) => Err(EnvError::invalid(type_name::<T>(), value, &e.to_string()))
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}
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}
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