imagecli 0.2.1

A command line image processing tool.
Documentation 
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use nom::{
    bytes::complete::tag,
    character::complete::{digit1, space0, space1},
    combinator::{map, map_res, opt, recognize},
    multi::separated_nonempty_list,
    sequence::{delimited, pair, preceded, tuple},
    IResult,
};

/// Converts a parser that returns a T: SomeTrait to one that returns a Box<dyn SomeTrait>.
#[macro_export]
macro_rules! map_to_boxed_trait {
    ($parser:expr, $trait:ident) => {
        map($parser, |o| {
            let boxed: Box<dyn $trait> = Box::new(o);
            boxed
        })
    };
}

/// Parses a nonempty separated list where the separator can be padded with arbitrary whitespace.
pub fn nonempty_sequence<'a, T, F>(
    separator: &'static str,
    element: F,
) -> impl Fn(&'a str) -> IResult<&'a str, Vec<T>>
where
    F: Fn(&'a str) -> IResult<&'a str, T>,
{
    separated_nonempty_list(delimited(space0, tag(separator), space0), element)
}

/// Parses a integer value.
pub fn int<T: std::str::FromStr>(input: &str) -> IResult<&str, T> {
    map_res(recognize(pair(opt(tag("-")), digit1)), |s: &str| {
        s.parse::<T>()
    })(input)
}

/// Matches 'name=<arg>'.
pub fn named_arg<'a, F, T>(name: &'static str, arg: F) -> impl Fn(&'a str) -> IResult<&'a str, T>
where
    F: Fn(&'a str) -> IResult<&'a str, T>,
{
    preceded(pair(tag(name), tag("=")), arg)
}

/// Parser for an operator which takes no args.
pub fn op_zero<T: Clone>(name: &'static str, t: T) -> impl Fn(&str) -> IResult<&str, T> {
    move |i| map(tag(name), |_| t.clone())(i)
}

/// Parser for an operator which takes a single arg.
pub fn op_one<'a, T, F1, A1, G>(
    name: &'static str,
    arg1: F1,
    build: G,
) -> impl Fn(&'a str) -> IResult<&'a str, T>
where
    F1: Fn(&'a str) -> IResult<&'a str, A1> + Copy,
    G: Fn(A1) -> T + Copy,
{
    move |i| {
        map(preceded(tag(name), preceded(space1, arg1)), |val| {
            build(val)
        })(i)
    }
}

/// Parser for an operator which takes a single optional arg.
pub fn op_one_opt<'a, T, F1, A1, G>(
    name: &'static str,
    arg1: F1,
    build: G,
) -> impl Fn(&'a str) -> IResult<&'a str, T>
where
    F1: Fn(&'a str) -> IResult<&'a str, A1> + Copy,
    G: Fn(Option<A1>) -> T + Copy,
{
    move |i| map(preceded(tag(name), opt(preceded(space1, arg1))), build)(i)
}

/// Parser for an operator which takes two args.
pub fn op_two<T, F1, F2, A1, A2, G>(
    name: &'static str,
    arg1: F1,
    arg2: F2,
    build: G,
) -> impl Fn(&str) -> IResult<&str, T>
where
    F1: Fn(&str) -> IResult<&str, A1> + Copy,
    F2: Fn(&str) -> IResult<&str, A2> + Copy,
    G: Fn(A1, A2) -> T + Copy,
{
    move |i| {
        map(
            preceded(
                tag(name),
                tuple((preceded(space1, arg1), preceded(space1, arg2))),
            ),
            |(val1, val2)| build(val1, val2),
        )(i)
    }
}

/// Parser for an operator which takes four args.
pub fn op_four<T, F1, F2, F3, F4, A1, A2, A3, A4, G>(
    name: &'static str,
    arg1: F1,
    arg2: F2,
    arg3: F3,
    arg4: F4,
    build: G,
) -> impl Fn(&str) -> IResult<&str, T>
where
    F1: Fn(&str) -> IResult<&str, A1> + Copy,
    F2: Fn(&str) -> IResult<&str, A2> + Copy,
    F3: Fn(&str) -> IResult<&str, A3> + Copy,
    F4: Fn(&str) -> IResult<&str, A4> + Copy,
    G: Fn(A1, A2, A3, A4) -> T + Copy,
{
    move |i| {
        map(
            preceded(
                tag(name),
                tuple((
                    preceded(space1, arg1),
                    preceded(space1, arg2),
                    preceded(space1, arg3),
                    preceded(space1, arg4),
                )),
            ),
            |(val1, val2, val3, val4)| build(val1, val2, val3, val4),
        )(i)
    }
}