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use nom::{
bytes::complete::{tag, take_while1},
combinator::{all_consuming, opt},
error::ParseError,
Err, IResult, InputLength, Parser,
};
#[derive(Debug, Clone, Copy)]
pub struct Task<'a> {
pub recipe: &'a str,
pub task: &'a str,
pub host: Option<&'a str>,
pub target: Option<&'a str>,
}
#[derive(Debug, Clone, Copy)]
pub struct TaskFlags {
pub force_run: bool,
}
fn is_name_char(c: char) -> bool {
matches!(c, 'a'..='z' | 'A' ..='Z' | '0'..='9' | '_' | '-')
}
fn name(input: &str) -> IResult<&str, &str> {
take_while1(is_name_char)(input)
}
fn task_id(input: &str) -> IResult<&str, (&str, &str)> {
let (input, recipe) = name(input)?;
let (input, _) = tag(":")(input)?;
let (input, task) = name(input)?;
Ok((input, (recipe, task)))
}
fn task_arg_target(input: &str) -> IResult<&str, &str> {
let (input, _) = tag(":")(input)?;
let (input, target) = name(input)?;
Ok((input, target))
}
fn task_args(input: &str) -> IResult<&str, (Option<&str>, Option<&str>)> {
let (input, _) = tag("/")(input)?;
let (input, host) = opt(name)(input)?;
let (input, target) = opt(task_arg_target)(input)?;
Ok((input, (host, target)))
}
fn task(input: &str) -> IResult<&str, Task> {
let (input, (recipe, task)) = task_id(input)?;
let (input, args) = opt(task_args)(input)?;
let (host, target) = args.unwrap_or_default();
Ok((
input,
Task {
recipe,
task,
host,
target,
},
))
}
fn task_flags(input: &str) -> IResult<&str, TaskFlags> {
let (input, force_run) = opt(tag("+"))(input)?;
Ok((
input,
TaskFlags {
force_run: force_run.is_some(),
},
))
}
fn task_with_flags(input: &str) -> IResult<&str, (Task, TaskFlags)> {
let (input, task) = task(input)?;
let (input, flags) = task_flags(input)?;
Ok((input, (task, flags)))
}
fn parse_all<I, O, E: ParseError<I>, F>(f: F, input: I) -> Result<O, Err<E>>
where
I: InputLength,
F: Parser<I, O, E>,
{
all_consuming(f)(input).map(|(_, result)| result)
}
pub fn parse_task_with_flags(input: &str) -> Option<(Task, TaskFlags)> {
parse_all(task_with_flags, input).ok()
}
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