1 files changed, 39 insertions, 0 deletions
diff --git a/crates/useflag/src/parsers.rs b/crates/useflag/src/parsers.rs
new file mode 100644
index 0000000..3007bde
--- /dev/null
+++ b/crates/useflag/src/parsers.rs
@@ -0,0 +1,39 @@
+use parseable::Parseable;
+
+use mon::{Parser, ParserIter, ascii_alphanumeric, one_of, tag};
+
+use crate::{IUseFlag, UseFlag};
+
+impl<'a> Parseable<'a, &'a str> for UseFlag {
+    type Parser = impl Parser<&'a str, Output = Self>;
+
+    fn parser() -> Self::Parser {
+        let start = ascii_alphanumeric();
+        let rest = ascii_alphanumeric()
+            .or(one_of("+_@-".chars()))
+            .repeated()
+            .many();
+
+        start
+            .and(rest)
+            .recognize()
+            .map(|output: &str| UseFlag(output.to_string()))
+    }
+}
+
+impl<'a> Parseable<'a, &'a str> for IUseFlag {
+    type Parser = impl Parser<&'a str, Output = Self>;
+
+    fn parser() -> Self::Parser {
+        UseFlag::parser()
+            .preceded_by(tag("+"))
+            .map(|flag| IUseFlag {
+                default: true,
+                flag,
+            })
+            .or(UseFlag::parser().map(|flag| IUseFlag {
+                default: false,
+                flag,
+            }))
+    }
+}