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|
use std::{
collections::{HashMap, HashSet},
fs, io,
path::{Path, PathBuf},
};
use mon::{Parser, ParserIter, ascii_whitespace1, input::InputIter};
use crate::{
Parseable,
repo::profile::{LineBasedFileExpr, Profile},
};
mod parsers;
#[derive(Debug, thiserror::Error)]
pub enum Error {
#[error("{0}: io error: {1}")]
Io(PathBuf, io::Error),
#[error("parser error: {0}")]
Parser(String),
}
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
struct Key(String);
#[derive(Debug, Clone)]
struct Literal(String);
#[derive(Debug, Clone)]
struct Interpolation(String);
#[derive(Debug, Clone)]
enum Segment {
Literal(Literal),
Interpolation(Interpolation),
}
#[derive(Debug, Clone)]
struct Assignment(Key, Vec<Segment>);
pub(super) fn evaluate<P: AsRef<Path>>(
parents: &[Profile],
path: P,
) -> Result<HashMap<String, String>, Error> {
let parsed = match fs::read_to_string(path.as_ref().join("make.defaults")) {
Ok(contents) => parse(&contents)?,
Err(e) if matches!(e.kind(), io::ErrorKind::NotFound) => HashMap::new(),
Err(e) => return Err(Error::Io(path.as_ref().to_path_buf(), e)),
};
let mut vars = interpolate(parents, parsed);
incremental(parents, &mut vars);
Ok(vars)
}
fn incremental(parents: &[Profile], vars: &mut HashMap<String, String>) {
for key in [
"USE",
"USE_EXPAND",
"USE_EXPAND_HIDDEN",
"CONFIG_PROTECT",
"CONFIG_PROTECT_MASK",
] {
let mut accumulated = Vec::new();
for parent in parents {
if let Some(values) = parent.make_defaults().get(key) {
accumulated.extend(values.split_ascii_whitespace());
}
}
if let Some(values) = vars.get(key) {
accumulated.extend(values.split_ascii_whitespace());
}
let mut final_values = Vec::new();
for var in accumulated {
if var == "-*" {
final_values.clear();
} else if let Some(stripped) = var.strip_prefix("-") {
final_values.retain(|v| *v != stripped);
} else {
final_values.push(var);
}
}
let mut seen = HashSet::new();
final_values.retain(|v| seen.insert(*v));
if !final_values.is_empty() {
vars.insert(key.to_string(), final_values.join(" "));
}
}
}
fn interpolate(parents: &[Profile], vars: HashMap<Key, Vec<Segment>>) -> HashMap<String, String> {
let parent_vars = parents
.iter()
.flat_map(|parent| parent.make_defaults().clone().into_iter())
.collect::<HashMap<_, _>>();
vars.into_iter()
.map(|(key, segments)| {
let interpolated = segments
.into_iter()
.map(|segment| match segment {
Segment::Interpolation(i) => parent_vars.get(&i.0).cloned().unwrap_or_default(),
Segment::Literal(literal) => literal.0.trim().to_string(),
})
.collect::<Vec<_>>();
let joined = interpolated.join("");
(key.0, joined)
})
.collect::<HashMap<String, String>>()
}
fn parse(contents: &str) -> Result<HashMap<Key, Vec<Segment>>, Error> {
Ok(LineBasedFileExpr::<Assignment>::parser()
.separated_by_with_opt_trailing(ascii_whitespace1())
.many()
.parse_finished(InputIter::new(contents))
.map_err(|e| Error::Parser(dbg!(e).rest().to_string()))?
.into_iter()
.filter_map(|expr| match expr {
LineBasedFileExpr::Comment => None,
LineBasedFileExpr::Expr(Assignment(key, value)) => Some((key, value)),
})
.collect())
}
|
