rustc: Add an annotation for the crate definition to view_item_use

1 files changed, 36 insertions, 7 deletions

diff --git a/src/comp/front/creader.rs b/src/comp/front/creader.rs
index 4564ae2b..d1eaba85 100644
--- a/src/comp/front/creader.rs
+++ b/src/comp/front/creader.rs
@@ -5,24 +5,53 @@ import front.ast;
 import middle.fold;
 import util.common;
 import util.common.span;
+
+import std.fs;
 import std.map.hashmap;
 
 // TODO: map to a real type here.
-type env = @hashmap[str, @ast.external_crate_info];
+type env = @rec(
+    @hashmap[str, @ast.external_crate_info] crate_cache,
+    vec[str] library_search_paths
+);
+
+// TODO: return something
+fn load_crate(ast.ident ident, vec[str] library_search_paths) -> @() {
+    for (str library_search_path in library_search_paths) {
+        auto path = fs.connect(library_search_path, ident);
+        // TODO
+    }
+
+    ret @();
+}
 
 fn fold_view_item_use(&env e, &span sp, ast.ident ident,
-        vec[@ast.meta_item] meta_items, ast.def_id id) -> @ast.view_item {
-    // TODO: find the crate
+        vec[@ast.meta_item] meta_items, ast.def_id id, ast.ann orig_ann)
+        -> @ast.view_item {
+    auto external_crate;
+    if (!e.crate_cache.contains_key(ident)) {
+        external_crate = load_crate(ident, e.library_search_paths);
+        e.crate_cache.insert(ident, external_crate);
+    } else {
+        external_crate = e.crate_cache.get(ident);
+    }
 
-    auto viu = ast.view_item_use(ident, meta_items, id);
+    auto ann = ast.ann_crate(external_crate);
+    auto viu = ast.view_item_use(ident, meta_items, id, ann);
     ret @fold.respan[ast.view_item_](sp, viu);
 }
 
 // Reads external crates referenced by "use" directives.
-fn read_crates(session.session sess, @ast.crate crate) -> @ast.crate {
-    auto external_crates = @common.new_str_hash[@ast.external_crate_info]();
+fn read_crates(session.session sess,
+               @ast.crate crate,
+               vec[str] library_search_paths) -> @ast.crate {
+    auto e = @rec(
+        [email protected]_str_hash[@ast.external_crate_info](),
+        library_search_paths=library_search_paths
+    );
+
     auto f = fold_view_item_use;
     auto fld = @rec(fold_view_item_use=f with *fold.new_identity_fold[env]());
-    ret fold.fold_crate[env](external_crates, fld, crate);
+    ret fold.fold_crate[env](e, fld, crate);
 }