create ebuild module

src/ebuild/parsers.rs

@@ -0,0 +1,155 @@
+use std::path::PathBuf;
+
+use mon::{Parser, alpha1, r#if, tag, whitespace1};
+
+use crate::{
+    Parseable,
+    ebuild::{Conditional, Depend, Eapi, License, SrcUri},
+    useflag::UseFlag,
+};
+
+impl<'a> Parseable<'a, &'a str> for SrcUri {
+    type Parser = impl Parser<&'a str, Output = Self>;
+
+    fn parser() -> Self::Parser {
+        let protocol = alpha1::<&str>().followed_by(tag("://"));
+
+        let uri = r#if(|c: &char| !c.is_ascii_whitespace())
+            .list(1..)
+            .recognize()
+            .map(|output: &str| output.to_string());
+
+        let name = r#if(|c: &char| !c.is_ascii_whitespace())
+            .list(1..)
+            .recognize()
+            .map(|output: &str| PathBuf::from(output));
+
+        uri.preceded_by(protocol)
+            .and(
+                name.preceded_by(tag("->").delimited_by(whitespace1(), whitespace1()))
+                    .opt(),
+            )
+            .map(|(uri, file_name)| SrcUri { uri, file_name })
+    }
+}
+
+impl<'a> Parseable<'a, &'a str> for License {
+    type Parser = impl Parser<&'a str, Output = Self>;
+
+    fn parser() -> Self::Parser {
+        let start = r#if(|c: &char| c.is_ascii_alphanumeric() || "_".contains(*c));
+        let rest = r#if(|c: &char| c.is_ascii_alphanumeric() || "+_.-".contains(*c)).list(0..);
+
+        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 = r#if(|c: &char| c.is_ascii_alphanumeric() || "_".contains(*c));
+        let rest = r#if(|c: &char| c.is_ascii_alphanumeric() || "+_.-".contains(*c)).list(0..);
+
+        start
+            .and(rest)
+            .recognize()
+            .map(|output: &str| Eapi(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 all_of_group = Depend::parser()
+                .separated_list(whitespace1(), 1..)
+                .delimited_by(tag("(").followed_by(whitespace1()), tag(")"))
+                .map(|exprs| Depend::AllOf(exprs));
+
+            let any_of_group = Depend::parser()
+                .separated_list(whitespace1(), 1..)
+                .delimited_by(tag("(").followed_by(whitespace1()), tag(")"))
+                .preceded_by(tag("||").followed_by(whitespace1()))
+                .map(|exprs| Depend::AnyOf(exprs));
+
+            let one_of_group = Depend::parser()
+                .separated_list(whitespace1(), 1..)
+                .delimited_by(tag("(").followed_by(whitespace1()), tag(")"))
+                .preceded_by(tag("^^").followed_by(whitespace1()))
+                .map(|exprs| Depend::OneOf(exprs));
+
+            let conditional_group = Conditional::parser()
+                .followed_by(whitespace1())
+                .and(
+                    Depend::parser()
+                        .separated_list(whitespace1(), 1..)
+                        .delimited_by(tag("(").followed_by(whitespace1()), tag(")")),
+                )
+                .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(|flag| Conditional::Negative(flag))
+            .or(UseFlag::parser()
+                .followed_by(tag("?"))
+                .map(|flag| Conditional::Positive(flag)))
+    }
+}
+
+#[cfg(test)]
+mod test {
+
+    use mon::input::InputIter;
+
+    use crate::{atom::Atom, ebuild::Depend};
+
+    use super::*;
+
+    #[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_list(whitespace1(), 0..)
+            .check_finished(it)
+            .unwrap();
+    }
+}