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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 build_ast(pair: pest::iterators::Pair<Rule>) -> Self {
assert!(matches!(pair.as_rule(), Rule::word));
let word = pair.into_inner().next().unwrap();
assert!(matches!(
word.as_rule(),
Rule::bareword | Rule::single_string | Rule::double_string
));
Self {
word: word.as_str().to_string(),
interpolate: matches!(
word.as_rule(),
Rule::bareword | Rule::double_string
),
}
}
}
#[derive(Debug, Clone)]
pub struct Exe {
exe: Word,
args: Vec<Word>,
}
impl Exe {
fn build_ast(pair: pest::iterators::Pair<Rule>) -> Self {
assert!(matches!(pair.as_rule(), Rule::exe));
let mut iter = pair.into_inner();
let exe = Word::build_ast(iter.next().unwrap());
let args = iter.map(Word::build_ast).collect();
Self { exe, args }
}
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 shift(&self) -> Self {
let mut new = self.clone();
let new_exe = new.args.remove(0);
new.exe = new_exe;
new
}
}
#[derive(Debug, Clone)]
pub struct Pipeline {
exes: Vec<Exe>,
input_string: String,
}
impl Pipeline {
pub fn parse(pipeline: &str) -> Result<Self, Error> {
Ok(Self::build_ast(
Shell::parse(Rule::pipeline, pipeline)
.map_err(|e| Error::new(pipeline, anyhow::anyhow!(e)))?
.next()
.unwrap(),
))
}
pub fn exes(&self) -> &[Exe] {
&self.exes
}
pub fn input_string(&self) -> &str {
&self.input_string
}
fn build_ast(pipeline: pest::iterators::Pair<Rule>) -> Self {
assert!(matches!(pipeline.as_rule(), Rule::pipeline));
let input_string = pipeline.as_str().to_string();
Self {
exes: pipeline.into_inner().map(Exe::build_ast).collect(),
input_string,
}
}
}
#[derive(Debug, Clone)]
pub struct Commands {
pipelines: Vec<Pipeline>,
input_string: String,
}
impl Commands {
pub fn parse(full_cmd: &str) -> Result<Self, Error> {
Ok(Self::build_ast(
Shell::parse(Rule::line, full_cmd)
.map_err(|e| Error::new(full_cmd, anyhow::anyhow!(e)))?
.next()
.unwrap()
.into_inner()
.next()
.unwrap(),
))
}
pub fn pipelines(&self) -> &[Pipeline] {
&self.pipelines
}
pub fn input_string(&self) -> &str {
&self.input_string
}
fn build_ast(commands: pest::iterators::Pair<Rule>) -> Self {
assert!(matches!(commands.as_rule(), Rule::commands));
let input_string = commands.as_str().to_string();
Self {
pipelines: commands
.into_inner()
.map(Pipeline::build_ast)
.collect(),
input_string,
}
}
}
#[derive(Debug)]
pub struct Error {
input: String,
e: anyhow::Error,
}
impl Error {
fn new(input: &str, e: anyhow::Error) -> Self {
Self {
input: input.to_string(),
e,
}
}
pub fn input(&self) -> &str {
&self.input
}
pub fn error(&self) -> &anyhow::Error {
&self.e
}
}
impl std::fmt::Display for Error {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(f, "failed to parse {}: {}", self.input, self.e)
}
}
impl std::error::Error for Error {
fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
Some(&*self.e)
}
}
|
