restructure passes

src/passes/privatize.rs

@@ -0,0 +1,55 @@
+use quote::ToTokens;
+use syn::{parse_quote, visit_mut::VisitMut, Visibility};
+
+use crate::processor::{tracking, PassController, ProcessState, Pass, SourceFile};
+
+struct Visitor<'a> {
+    pub_crate: Visibility,
+    process_state: ProcessState,
+    current_path: Vec<String>,
+    checker: &'a mut PassController,
+}
+
+impl<'a> Visitor<'a> {
+    fn new(checker: &'a mut PassController) -> Self {
+        Self {
+            process_state: ProcessState::NoChange,
+            pub_crate: parse_quote! { pub(crate) },
+            current_path: Vec::new(),
+            checker,
+        }
+    }
+}
+
+impl VisitMut for Visitor<'_> {
+    fn visit_visibility_mut(&mut self, vis: &mut Visibility) {
+        if let Visibility::Public(_) = vis {
+            if self.checker.can_process(&self.current_path) {
+                self.process_state = ProcessState::Changed;
+                *vis = self.pub_crate.clone();
+            }
+        }
+    }
+
+    tracking!();
+}
+
+#[derive(Default)]
+pub struct Privatize {}
+
+impl Pass for Privatize {
+    fn process_file(
+        &mut self,
+        krate: &mut syn::File,
+        _: &SourceFile,
+        checker: &mut PassController,
+    ) -> ProcessState {
+        let mut visitor = Visitor::new(checker);
+        visitor.visit_file_mut(krate);
+        visitor.process_state
+    }
+
+    fn name(&self) -> &'static str {
+        "privatize"
+    }
+}