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|
use pest::Parser as _;
#[derive(pest_derive::Parser)]
#[grammar = "shell.pest"]
struct Shell;
#[derive(Debug, Clone)]
pub struct Word {
word: String,
interpolate: bool,
}
impl Word {
fn new(word: &str) -> Self {
Self {
word: word.to_string(),
interpolate: true,
}
}
fn literal(word: &str) -> Self {
Self {
word: word.to_string(),
interpolate: false,
}
}
}
#[derive(Debug, Clone)]
pub struct Exe {
exe: Word,
args: Vec<Word>,
original: String,
}
impl Exe {
fn parse(pair: pest::iterators::Pair<Rule>) -> Self {
assert!(matches!(pair.as_rule(), Rule::exe));
let original = pair.as_str().to_string();
let mut iter = pair.into_inner();
let exe = Word::new(iter.next().unwrap().as_str());
let args = iter.map(|word| Word::new(word.as_str())).collect();
Self {
exe,
args,
original,
}
}
pub fn exe(&self) -> &str {
&self.exe.word
}
pub fn args(&self) -> impl Iterator<Item = &str> {
self.args.iter().map(|arg| arg.word.as_ref())
}
pub fn input_string(&self) -> String {
self.original.clone()
}
}
#[derive(Debug, Clone)]
pub enum Command {
Exe(Exe),
And(Exe, Box<Command>),
Or(Exe, Box<Command>),
Both(Exe, Box<Command>),
Pipe(Exe, Box<Command>),
}
impl Command {
pub fn parse(full_cmd: &str) -> Self {
Self::build_ast(
Shell::parse(Rule::line, full_cmd)
.unwrap()
.next()
.unwrap()
.into_inner(),
)
}
pub fn input_string(&self) -> String {
match self {
Self::Exe(exe) => exe.input_string(),
Self::And(exe, command) => format!(
"{} && {}",
exe.input_string(),
command.input_string()
),
Self::Or(exe, command) => format!(
"{} || {}",
exe.input_string(),
command.input_string()
),
Self::Both(exe, command) => {
format!("{}; {}", exe.input_string(), command.input_string())
}
Self::Pipe(exe, command) => {
format!("{} | {}", exe.input_string(), command.input_string())
}
}
}
fn build_ast(mut pairs: pest::iterators::Pairs<Rule>) -> Self {
let command = pairs.next().unwrap();
assert!(matches!(command.as_rule(), Rule::command));
let mut inner = command.into_inner();
let exe = inner.next().unwrap();
let exe = Exe::parse(exe);
if let Some(rest) = inner.next() {
let rule = rest.as_rule();
let ast = Self::build_ast(rest.into_inner());
match rule {
Rule::and => Self::And(exe, Box::new(ast)),
Rule::or => Self::Or(exe, Box::new(ast)),
Rule::both => Self::Both(exe, Box::new(ast)),
Rule::pipe => Self::Pipe(exe, Box::new(ast)),
_ => unreachable!(),
}
} else {
Self::Exe(exe)
}
}
}
|
