118 lines
3.3 KiB
Rust
118 lines
3.3 KiB
Rust
use std::fs;
|
|
use std::env;
|
|
use std::fmt;
|
|
use std::usize;
|
|
use std::collections::HashMap;
|
|
|
|
mod eval;
|
|
|
|
struct Program {
|
|
data: Vec<String>,
|
|
pc: usize,
|
|
vars: HashMap<char, String>
|
|
}
|
|
|
|
impl Program {
|
|
fn from_string(program: String) -> Program {
|
|
let mut op_list: Vec<String> = Vec::new();
|
|
|
|
for opcode in program.split("\n").collect::<Vec<&str>>() {
|
|
let new_op = opcode.to_owned();
|
|
// new_op = new_op.replace("\n", "");
|
|
|
|
if new_op.len() != 0 {
|
|
op_list.push(new_op.to_owned());
|
|
}
|
|
}
|
|
|
|
return Program{ data: op_list, pc: 0, vars: HashMap::new() };
|
|
}
|
|
|
|
fn args_or_vars(&self, arguments: &str) -> String {
|
|
let mut builder = String::from("");
|
|
let argument_vec: Vec<char> = arguments.chars().collect();
|
|
|
|
for index in 0..argument_vec.len() {
|
|
let current_char = argument_vec[index];
|
|
let str_to_push: String;
|
|
|
|
if index > 0 {
|
|
if argument_vec[index-1] == '$' {
|
|
continue;
|
|
}
|
|
}
|
|
|
|
if current_char == '$' {
|
|
let variable = argument_vec[index+1];
|
|
|
|
let key = self.vars.get(&variable);
|
|
match key {
|
|
Some(value) => str_to_push = value.to_string(),
|
|
None => panic!("NotFoundError: Variable {} has not been defined", variable)
|
|
}
|
|
|
|
} else {
|
|
str_to_push = current_char.to_string();
|
|
}
|
|
|
|
|
|
builder.push_str(&str_to_push);
|
|
}
|
|
|
|
builder
|
|
}
|
|
|
|
fn add_var(&mut self, arguments: &str) {
|
|
let argument_vec: Vec<char> = arguments.chars().collect();
|
|
let name = argument_vec[0];
|
|
let value = argument_vec[1..].into_iter().collect::<String>();
|
|
|
|
self.vars.insert(name, value);
|
|
}
|
|
|
|
fn parse(&mut self, instruction: &String) {
|
|
let opcode = instruction.chars().collect::<Vec<char>>()[0];
|
|
let arguments = &instruction[1..];
|
|
|
|
match opcode {
|
|
'p' => println!("{}", self.args_or_vars(arguments)),
|
|
'a' => println!("{}", eval::do_math(self.args_or_vars(arguments), '+')),
|
|
's' => println!("{}", eval::do_math(self.args_or_vars(arguments), '-')),
|
|
'm' => println!("{}", eval::do_math(self.args_or_vars(arguments), '*')),
|
|
'd' => println!("{}", eval::do_math(self.args_or_vars(arguments), '/')),
|
|
'l' => self.add_var(arguments),
|
|
_ => panic!("SyntaxError: No such opcode: {}", self.pc)
|
|
}
|
|
}
|
|
|
|
fn run(&mut self) {
|
|
println!("{}", self);
|
|
while self.pc < self.data.len() {
|
|
let instruction = self.data[self.pc].to_owned();
|
|
|
|
self.parse(&instruction);
|
|
|
|
self.pc = self.pc + 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
impl fmt::Display for Program {
|
|
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
|
|
write!(f, "Program ({:?})", self.data)
|
|
}
|
|
}
|
|
|
|
fn main() {
|
|
let args: Vec<String> = env::args().collect();
|
|
if args.len() == 1 {
|
|
panic!("You must provide a filename!");
|
|
}
|
|
|
|
let filename = &args[1];
|
|
|
|
let contents = fs::read_to_string(filename).expect("Something went wrong reading the file");
|
|
let mut prog = Program::from_string(contents);
|
|
prog.run();
|
|
}
|