1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
|
//! 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: \"{}\" with {} on their face.", speaker.text_description(), text, 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 let None = {
input.clear();
std::io::stdin().read_line(&mut input)?;
chosen = input.trim().parse().ok().filter(|o : &usize| *o > 0 && *o <= options.len());
chosen
} {
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(())
}
|
