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//! this module interprets the domain specific language as a text adventure.
use crate::dsl::FreeSausageRoll;
pub fn run<'a, 's: 'a>(mut game: FreeSausageRoll<'a, 's, ()>) -> std::io::Result<()> {
//this function doesn't know who it is, or why it is here. It only knows it must deal.
//Deal with the few commands in the eDSL and nothing more.
//This would be easier to write recursively. However, in an actual project this might run for quite some time.
//Since we operate on the stack, let's rather be safe than sorry, and use a loop instead of recursion therefore.
while let FreeSausageRoll::Free(command) = game {
game = match *command {
crate::dsl::SausageRoll::SayDialogueLine {
speaker,
text,
mood,
next,
} => {
println!(
"{} says: \"{text}\" with {} on their face.",
speaker.text_description(),
mood.text_description()
);
next
}
crate::dsl::SausageRoll::GivePlayerOptions { options, next } => {
println!("Your options are:");
for (id, option) in options.iter().enumerate().map(|(i, o)| (i + 1, o)) {
println!("{id}: {option}");
}
let mut input = String::new();
let mut chosen;
while {
input.clear();
std::io::stdin().read_line(&mut input)?;
chosen = input
.trim()
.parse()
.ok()
.filter(|o: &usize| *o > 0 && *o <= options.len());
chosen.is_none()
} {
println!("Invalid choice. Please select one of the options given above.");
}
println!();
next(chosen.unwrap() - 1)
}
crate::dsl::SausageRoll::PresentLocation { location, next } => {
println!("{}", location.get_text_description());
next
}
crate::dsl::SausageRoll::Exposition { text, next } => {
println!("{text}");
next
}
};
}
std::io::Result::Ok(())
}
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