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enve/examples/calc.rs

37 lines
907 B
Rust
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use enve::estr::SepVec;
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type MinusVec<T> = SepVec<T, '-'>;
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type PlusVec<T> = SepVec<T, '+'>;
type MulVec<T> = SepVec<T, '*'>;
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const HELP_MESSAGE: &str = "
USAGE:
E=10+10*2+4 cargo run --example calc --all-features
";
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fn main() -> Result<(), enve::Error> {
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let res: f32 = enve::get::<PlusVec<MinusVec<MulVec<f32>>>>("E")
.map_err(|err| {
match err {
enve::Error::NotPresent => eprintln!("The expression was not found"),
rest => eprintln!("ERROR: {}", rest),
}
eprintln!("{}", HELP_MESSAGE);
std::process::exit(0);
})
.unwrap()
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.iter()
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.map(|p| {
p.iter()
.map(|m| m.iter().product::<f32>())
.reduce(|acc, v| acc - v)
.unwrap_or_default()
})
.sum::<f32>();
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println!("result: {}", res);
Ok(())
}