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|
use crate::vm::{ VirtualMachineInterface, VirtualMachine, Word };
static MAX_VALUE_WIDTH: usize = 8;
fn expects_n_args(args: &Vec<&str>, n: usize) -> Result<(), String> {
if args.len() - 1 != n {
Err(format!("Command '{}' expected {n} arguments, {} were given!", args[0], args.len() - 1))
}
else {
Ok(())
}
}
fn parse_location(arg: &str, assignment: bool) -> Result<Vec<usize>, String> {
let nums_str = arg.to_string();
let nums = nums_str
.split(&['.', ':'])
.collect::<Vec<&str>>();
let start = nums[0].parse::<usize>()
.map_err(|_| format!("Unknown command '{}'!", nums[0]))?;
// Single location
if nums.len() == 1 {
Ok(vec![start])
}
// Range location
else {
let end = nums[1].parse::<usize>()
.map_err(|_| format!("Expected location!"))?;
if assignment {
Ok(vec![start, end])
}
// Range addresses
else {
Ok(Vec::from_iter(start..=end))
}
}
}
fn assign_location(locs: Vec<usize>, vm: &mut VirtualMachine) {
print_locations(vec![locs[0]], vm);
vm.set_word(locs[0], locs[1] as Word);
}
fn print_locations(locs: Vec<usize>, vm: &VirtualMachine) {
let padding = format!("{}", locs.last().unwrap()).len();
for (i, loc) in locs.into_iter().enumerate() {
if i % MAX_VALUE_WIDTH == 0 {
if i > 0 {
println!();
}
print!("{:indent$}:", loc, indent=padding);
}
print!(" {:ident$}", vm.get_word(loc), ident=6);
}
println!();
}
pub(super) fn parse_and_exec(input: String, vm: &mut VirtualMachine) -> Result<(), String> {
let args = input
.split(&[' ', '\t', '\n', '\r'])
.filter(|x| !x.is_empty())
.collect::<Vec<&str>>();
if args.len() == 0 {
println!();
return Ok(());
}
match args[0] {
/* Run mode */
"r" | "run" => {
expects_n_args(&args, 1)?;
if ! vm.is_halted() {
return Err(format!("Machine already running!"));
}
vm.set_start(args[1].parse().unwrap());
},
/* Single step mode */
"s" | "single" => {
expects_n_args(&args, 1)?;
if ! vm.is_halted() {
return Err(format!("Machine already running!"));
}
if vm.is_single_step() {
return Err(format!("Machine already in single-step mode!"));
}
vm.set_single_step(true);
vm.set_start(args[1].parse().unwrap());
},
"c" | "continue" => {
expects_n_args(&args, 0)?;
if ! vm.is_single_step() {
return Err(format!("Machine not in single-step mode!"));
}
vm.set_single_step(false);
vm.set_halt(false);
},
"n" | "next" => {
expects_n_args(&args, 0)?;
if ! vm.is_single_step() {
return Err(format!("Machine not in single-step mode!"));
}
vm.step();
},
/* Other */
"q" | "quit" | "e" | "exit" => return Err(String::new()),
"h" | "?" | "help" => {
print!("<ADDRESS> is a usize constant
<VALUE> is a Word (i64) constant
Multiple 'Memory IO' commands may be put on a single line, when
separated by spaces
General commands:
h, ?, help This menu
q, e, quit, exit Stop and exit the virtual machine
Normal execution:
r, run <ADDRESS> Start normal execution at ADDRESS
Only applicable when 'HALTED'
Single-step execution:
s, single <ADDRESS> Start single-step execution at ADDRESS
c, continue Resume normal execution
Only applicable when in 'STEP' mode
n, next Execute next instruction
Only applicable when in 'STEP' mode
Memory IO:
<ADDRESS> Print the value at the location
<ADDRESS>.<ADDRESS> Print the values between the locations
(inclusive range)
<ADDRESS>:<VALUE> Set value at ADDRESS to VALUE
");
},
_ => {
for arg in args {
let assignment = arg.contains(':');
let locs = parse_location(arg, assignment)?;
if assignment {
assign_location(locs, vm);
}
else {
print_locations(locs, vm);
}
}
},
}
Ok(())
}
|
