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
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
use std::convert::TryFrom;
use crate::machine::hook::{HookResult, PreExecuteHook};
use crate::machine::instruction::MachineInstruction;
use crate::machine::output_receiver::{NoopOutputReceiver, OutputReceiver};
use crate::machine::register::{HashMapRegister, MachineRegister};
pub mod hook;
pub mod instruction;
pub mod output_receiver;
pub mod register;
pub struct Machine<I: MachineInstruction, R: MachineRegister, O: OutputReceiver<R>> {
instructions: Vec<I>,
pub register: R,
pub output_receiver: O,
counter: i64,
}
impl<I: MachineInstruction> Machine<I, HashMapRegister, NoopOutputReceiver> {
pub fn new_simple_machine(
instructions: &[I],
) -> Machine<I, HashMapRegister, NoopOutputReceiver> {
Machine {
instructions: instructions.to_vec(),
register: HashMapRegister::default(),
output_receiver: NoopOutputReceiver,
counter: 0,
}
}
}
impl<I, R, O> Machine<I, R, O>
where
I: MachineInstruction,
R: MachineRegister,
O: OutputReceiver<R>,
{
pub fn new_machine(instructions: &[I], register: R, output_receiver: O) -> Machine<I, R, O> {
Machine {
instructions: instructions.to_vec(),
register,
output_receiver,
counter: 0,
}
}
pub fn run<H: PreExecuteHook<I>>(&mut self, pre_execute_hook: &mut H) {
while let Some((idx, instruction)) = self.get_next_instruction() {
match pre_execute_hook.run(self, &instruction, idx) {
HookResult::Proceed => {
self.counter +=
instruction.execute(&mut self.register, &mut self.output_receiver);
}
HookResult::Skip => {
self.counter += 1;
}
HookResult::Goto(idx) => {
self.counter = idx;
}
HookResult::Abort => {
return;
}
}
}
}
pub fn get_counter(&self) -> i64 {
self.counter
}
pub fn get_instruction(&self, idx: i64) -> Option<(usize, I)> {
usize::try_from(idx).ok().and_then(|idx| {
self.instructions
.get(idx)
.map(|instruction| (idx, instruction.clone()))
})
}
pub fn set_instruction(&mut self, idx: i64, new_instruction: &I) {
usize::try_from(idx).ok().and_then(|idx| {
self.instructions
.get_mut(idx)
.map(|instruction| *instruction = new_instruction.clone())
});
}
fn get_next_instruction(&self) -> Option<(usize, I)> {
self.get_instruction(self.counter)
}
}
#[cfg(test)]
mod tests {
use crate::error::ParseError;
use crate::machine::hook::NoopHook;
use crate::machine::instruction::ParsedMachineInstruction;
use super::*;
#[test]
fn test_machine() {
let instructions = vec![MockInstruction; 3];
let mut machine = Machine::new_simple_machine(&instructions);
machine.run(&mut NoopHook::default());
assert_eq!(machine.register.read('a'), 30);
}
#[derive(Clone)]
struct MockInstruction;
impl MachineInstruction for MockInstruction {
fn execute<R: MachineRegister, O: OutputReceiver<R>>(
&self,
register: &mut R,
_output_receiver: &mut O,
) -> i64 {
register.increment('a', 10);
1
}
fn from_parsed_machine_instruction(
_parsed: &ParsedMachineInstruction,
) -> Result<Self, ParseError> {
unimplemented!()
}
}
}