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59 lines
1.3 KiB
59 lines
1.3 KiB
use std::error;
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use std::fmt;
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use std::convert::Infallible;
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pub mod bytes;
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pub trait Conversion
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{
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const UNIT: &'static str;
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type Output: fmt::Display;
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type Unit: fmt::Display = Self::Output;
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type Error: Into<ConversionError> = ConversionError;
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fn convert(&self, input: &str) -> Result<(Self::Output, Option<Self::Unit>), Self::Error>;
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}
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#[derive(Debug)]
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pub struct ConversionError(String);
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impl error::Error for ConversionError{}
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impl fmt::Display for ConversionError
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{
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result
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{
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write!(f, "conversion failed: {}", self.0)
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}
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}
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impl From<Infallible> for ConversionError
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{
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fn from(from: Infallible) -> Self
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{
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match from {}
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}
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}
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fn print_output<T,U>((value, units): (T, Option<U>))
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where T: fmt::Display,
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U: fmt::Display
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{
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println!("{}", value);
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if let Some(units) = units
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{
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eprintln!("{}", units);
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}
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}
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/// Dispatch a conversion of `value` for type `unit` and print the result to stdout.
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pub fn dispatch_out(unit: impl AsRef<str>, value: impl AsRef<str>) -> Result<(), ConversionError>
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{
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match unit.as_ref() {
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bytes::Bytes::UNIT => print_output(bytes::Bytes.convert(value.as_ref())?),
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name => return Err(ConversionError(format!("Unknown unit {}", name))),
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}
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Ok(())
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}
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