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/*
Copyright 2023 Gabriel Bjørnager Jensen.
This file is part of AAS.
AAS is free software: you can redistribute it
and/or modify it under the terms of the GNU
General Public License as published by the Free
Software Foundation, either version 3 of the
License, or (at your option) any later version.
AAS is distributed in the hope that it will
be useful, but WITHOUT ANY WARRANTY; without
even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU
General Public License along with AAS. If not,
see <https://www.gnu.org/licenses/>.
*/
use crate::app::App;
use crate::cpu::Cpu;
use crate::format::Format;
use std::env::args;
use std::str::FromStr;
macro_rules! use_remainder {
($destination: ident, $argument: expr, $index: expr) => {{
let argument: &[char] = $argument;
let index: usize = $index + 0x1;
if argument.len() <= index {
let c = argument[index - 0x1];
Err(format!("missing value for short '{}'", c))
} else {
let value: String = argument[$index + 0x1..].iter().collect();
$destination = Some(value);
break;
}
}};
}
impl App {
pub fn init() -> Result<Self, String> {
if args().len() < 0x2 { Self::print_help() };
let mut input: Option<String> = None;
let mut output: Option<String> = None;
let mut cpu: Option<String> = None;
let mut format: Option<String> = None;
let mut handle_short = |argument: &String| -> Result<(), String> {
let argument: Vec<char> = argument.chars().collect();
for (index, c) in argument.iter().enumerate().skip(0x1) {
match c {
'f' => use_remainder!(format, &argument, index)?,
'h' => Self::print_help(),
'o' => use_remainder!(output, &argument, index)?,
'm' => use_remainder!(cpu, &argument, index)?,
'v' => Self::print_version(),
_ => { return Err(format!("invalid short parameter '{c}'")) },
};
}
return Ok(());
};
for argument in args().skip(0x1) {
if argument.is_empty() { continue };
if argument.chars().nth(0x0) != Some('-') {
// This argument is the input path.
if input.is_some() { return Err(format!("input pathy is already set (to \"{}\")", input.as_ref().unwrap())) };
input = Some(argument.to_owned());
continue;
}
handle_short(&argument)?;
}
// Check if any of the mandatory parameters have
// been set.
if input.is_none() { return Err("missing input path".to_string()) };
if output.is_none() { output = Some("a.out".to_string()) };
if cpu.is_none() { return Err("missing cpu".to_string()) };
let format = match format {
Some(format) => Format::from_str(&format)?,
_ => Format::default(),
};
return Ok(Self {
input: input.unwrap(),
output: output.unwrap(),
cpu: Cpu::from_str(&cpu.unwrap())?,
format,
});
}
}
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