1 files changed, 207 insertions, 0 deletions
diff --git a/crates/repo/src/ebuild/parsers.rs b/crates/repo/src/ebuild/parsers.rs
new file mode 100644
index 0000000..6dc3525
--- /dev/null
+++ b/crates/repo/src/ebuild/parsers.rs
@@ -0,0 +1,207 @@
+use std::path::PathBuf;
+
+use crate::ebuild::{Conditional, Depend, Eapi, Eclass, License, SrcUri, Uri, UriPrefix};
+
+use mon::{
+    Parser, ParserIter, ascii_alpha1, ascii_alphanumeric, ascii_whitespace1, r#if, one_of, tag,
+};
+
+use parseable::Parseable;
+
+use useflag::UseFlag;
+
+impl<'a> Parseable<'a, &'a str> for UriPrefix {
+    type Parser = impl Parser<&'a str, Output = Self>;
+
+    fn parser() -> Self::Parser {
+        tag("+mirror")
+            .map(|_| UriPrefix::Mirror)
+            .or(tag("+fetch").map(|_| UriPrefix::Fetch))
+    }
+}
+
+impl<'a> Parseable<'a, &'a str> for Uri {
+    type Parser = impl Parser<&'a str, Output = Self>;
+
+    fn parser() -> Self::Parser {
+        let protocol = ascii_alpha1::<&str>()
+            .followed_by(tag("://"))
+            .map(|output: &str| output.to_string());
+        let path = r#if(|c: &char| !c.is_ascii_whitespace())
+            .repeated()
+            .at_least(1)
+            .recognize()
+            .map(|output: &str| output.to_string());
+
+        protocol
+            .and(path)
+            .map(|(protocol, path)| Uri { protocol, path })
+    }
+}
+
+impl<'a> Parseable<'a, &'a str> for SrcUri {
+    type Parser = impl Parser<&'a str, Output = Self>;
+
+    fn parser() -> Self::Parser {
+        let filename = || {
+            r#if(|c: &char| !c.is_ascii_whitespace())
+                .repeated()
+                .at_least(1)
+                .recognize()
+                .map(|output: &str| PathBuf::from(output))
+        };
+
+        let uri = UriPrefix::parser()
+            .opt()
+            .and(Uri::parser())
+            .and(filename().preceded_by(tag(" -> ")).opt())
+            .map(|((prefix, uri), filename)| SrcUri::Uri {
+                prefix,
+                uri,
+                filename,
+            });
+
+        uri.or(filename().map(|path: PathBuf| SrcUri::Filename(path)))
+    }
+}
+
+impl<'a> Parseable<'a, &'a str> for License {
+    type Parser = impl Parser<&'a str, Output = Self>;
+
+    fn parser() -> Self::Parser {
+        let start = ascii_alphanumeric().or(one_of("_".chars()));
+        let rest = ascii_alphanumeric()
+            .or(one_of("+_.-".chars()))
+            .repeated()
+            .many();
+
+        start
+            .and(rest)
+            .recognize()
+            .map(|output: &str| License(output.to_string()))
+    }
+}
+
+impl<'a> Parseable<'a, &'a str> for Eapi {
+    type Parser = impl Parser<&'a str, Output = Self>;
+
+    fn parser() -> Self::Parser {
+        let start = ascii_alphanumeric().or(one_of("_".chars()));
+        let rest = ascii_alphanumeric()
+            .or(one_of("+_.-".chars()))
+            .repeated()
+            .many();
+
+        start
+            .and(rest)
+            .recognize()
+            .map(|output: &str| Eapi(output.to_string()))
+    }
+}
+
+// TODO:
+// Cant find information about eclass names in pms so we allow anything except
+// for whitespace.
+impl<'a> Parseable<'a, &'a str> for Eclass {
+    type Parser = impl Parser<&'a str, Output = Self>;
+
+    fn parser() -> Self::Parser {
+        r#if(|c: &char| !c.is_ascii_whitespace())
+            .repeated()
+            .at_least(1)
+            .recognize()
+            .map(|output: &str| Eclass(output.to_string()))
+    }
+}
+
+impl<'a, T> Parseable<'a, &'a str> for Depend<T>
+where
+    T: Parseable<'a, &'a str>,
+{
+    type Parser = impl Parser<&'a str, Output = Self>;
+
+    fn parser() -> Self::Parser {
+        |it| {
+            let exprs = || {
+                Depend::parser()
+                    .separated_by_with_trailing(ascii_whitespace1())
+                    .at_least(1)
+                    .delimited_by(tag("(").followed_by(ascii_whitespace1()), tag(")"))
+            };
+
+            let all_of_group = exprs().map(|exprs| Depend::AllOf(exprs));
+
+            let any_of_group = exprs()
+                .preceded_by(tag("||").followed_by(ascii_whitespace1()))
+                .map(|exprs| Depend::AnyOf(exprs));
+
+            let one_of_group = exprs()
+                .preceded_by(tag("^^").followed_by(ascii_whitespace1()))
+                .map(|exprs| Depend::OneOf(exprs));
+
+            let conditional_group = Conditional::parser()
+                .followed_by(ascii_whitespace1())
+                .and(exprs())
+                .map(|(conditional, exprs)| Depend::ConditionalGroup(conditional, exprs));
+
+            T::parser()
+                .map(|e| Depend::Element(e))
+                .or(conditional_group)
+                .or(any_of_group)
+                .or(all_of_group)
+                .or(one_of_group)
+                .parse(it)
+        }
+    }
+}
+
+impl<'a> Parseable<'a, &'a str> for Conditional {
+    type Parser = impl Parser<&'a str, Output = Self>;
+
+    fn parser() -> Self::Parser {
+        UseFlag::parser()
+            .preceded_by(tag("!"))
+            .followed_by(tag("?"))
+            .map(Conditional::Negative)
+            .or(UseFlag::parser()
+                .followed_by(tag("?"))
+                .map(Conditional::Positive))
+    }
+}
+
+#[cfg(test)]
+mod test {
+
+    use super::*;
+    
+    use mon::{ParserIter, input::InputIter};
+
+    use atom::Atom;
+
+    use crate::ebuild::Depend;
+
+    #[test]
+    fn test_src_uri() {
+        let tests = [
+            "https://example.com/foo/bar.tar.gz",
+            "https://example.com/foo/bar.tar.gz -> bar.tar.gz",
+        ];
+
+        for test in tests {
+            SrcUri::parser()
+                .check_finished(InputIter::new(test))
+                .unwrap();
+        }
+    }
+
+    #[test]
+    fn test_expr() {
+        let it = InputIter::new("flag? ( || ( foo/bar foo/bar ) )");
+
+        Depend::<Atom>::parser()
+            .separated_by(ascii_whitespace1())
+            .many()
+            .check_finished(it)
+            .unwrap();
+    }
+}