diff --git a/crates/env_filter/src/directive.rs b/crates/env_filter/src/directive.rs
new file mode 100644
index 0000000..3721ef7
--- /dev/null
+++ b/crates/env_filter/src/directive.rs
@@ -0,0 +1,20 @@
+use log::Level;
+use log::LevelFilter;
+
+#[derive(Debug)]
+pub(crate) struct Directive {
+    pub(crate) name: Option<String>,
+    pub(crate) level: LevelFilter,
+}
+
+// Check whether a level and target are enabled by the set of directives.
+pub(crate) fn enabled(directives: &[Directive], level: Level, target: &str) -> bool {
+    // Search for the longest match, the vector is assumed to be pre-sorted.
+    for directive in directives.iter().rev() {
+        match directive.name {
+            Some(ref name) if !target.starts_with(&**name) => {}
+            Some(..) | None => return level <= directive.level,
+        }
+    }
+    false
+}
diff --git a/crates/env_filter/src/lib.rs b/crates/env_filter/src/lib.rs
index 3d97d38..41b71f8 100644
--- a/crates/env_filter/src/lib.rs
+++ b/crates/env_filter/src/lib.rs
@@ -50,6 +50,7 @@
 //! }
 //! ```
 
+mod directive;
 mod op;
 mod parser;
 
@@ -57,8 +58,10 @@ use std::env;
 use std::fmt;
 use std::mem;
 
-use log::{Level, LevelFilter, Metadata, Record};
+use log::{LevelFilter, Metadata, Record};
 
+use directive::enabled;
+use directive::Directive;
 use op::FilterOp;
 use parser::parse_spec;
 
@@ -210,12 +213,6 @@ impl fmt::Debug for Builder {
     }
 }
 
-#[derive(Debug)]
-struct Directive {
-    name: Option<String>,
-    level: LevelFilter,
-}
-
 /// A log filter.
 ///
 /// This struct can be used to determine whether or not a log record
@@ -286,18 +283,6 @@ impl fmt::Debug for Filter {
     }
 }
 
-// Check whether a level and target are enabled by the set of directives.
-fn enabled(directives: &[Directive], level: Level, target: &str) -> bool {
-    // Search for the longest match, the vector is assumed to be pre-sorted.
-    for directive in directives.iter().rev() {
-        match directive.name {
-            Some(ref name) if !target.starts_with(&**name) => {}
-            Some(..) | None => return level <= directive.level,
-        }
-    }
-    false
-}
-
 #[cfg(test)]
 mod tests {
     use log::{Level, LevelFilter};