Add the ability to ignore tests by compiler config

[test]
[ignore(cfg(target_os = "win32"))]

src/comp/front/attr.rs

@@ -18,6 +18,7 @@ export require_unique_names;
 export get_attr_name;
 export get_meta_item_name;
 export get_meta_item_value_str;
+export get_meta_item_list;
 export mk_name_value_item_str;
 export mk_name_value_item;
 export mk_list_item;
@@ -85,6 +86,13 @@ fn get_meta_item_value_str(meta: @ast::meta_item) -> option::t<str> {
     }
 }
 
+fn get_meta_item_list(meta: @ast::meta_item) -> option::t<[@ast::meta_item]> {
+    alt meta.node {
+      ast::meta_list(_, l) { option::some(l) }
+      _ { option::none }
+    }
+}
+
 fn attr_meta(attr: ast::attribute) -> @ast::meta_item { @attr.node.value }
 
 // Get the meta_items from inside a vector of attributes

src/comp/front/config.rs

@@ -3,6 +3,7 @@ import syntax::{ast, fold};
 import attr;
 
 export strip_unconfigured_items;
+export metas_in_cfg;
 
 // Support conditional compilation by transforming the AST, stripping out
 // any items that do not belong in the current configuration
@@ -88,31 +89,24 @@ fn native_item_in_cfg(cfg: ast::crate_cfg, item: @ast::native_item) -> bool {
 // Determine if an item should be translated in the current crate
 // configuration based on the item's attributes
 fn in_cfg(cfg: ast::crate_cfg, attrs: [ast::attribute]) -> bool {
+    metas_in_cfg(cfg, attr::attr_metas(attrs))
+}
+
+fn metas_in_cfg(cfg: ast::crate_cfg, metas: [@ast::meta_item]) -> bool {
 
     // The "cfg" attributes on the item
-    let item_cfg_attrs = attr::find_attrs_by_name(attrs, "cfg");
-    let item_has_cfg_attrs = vec::len(item_cfg_attrs) > 0u;
-    if !item_has_cfg_attrs { ret true; }
+    let cfg_metas = attr::find_meta_items_by_name(metas, "cfg");
 
     // Pull the inner meta_items from the #[cfg(meta_item, ...)]  attributes,
     // so we can match against them. This is the list of configurations for
     // which the item is valid
-    let item_cfg_metas = {
-        fn extract_metas(&&inner_items: [@ast::meta_item],
-                         &&cfg_item: @ast::meta_item) -> [@ast::meta_item] {
-            alt cfg_item.node {
-              ast::meta_list(name, items) {
-                assert (name == "cfg");
-                inner_items + items
-              }
-              _ { inner_items }
-            }
-        }
-        let cfg_metas = attr::attr_metas(item_cfg_attrs);
-        vec::foldl(extract_metas, [], cfg_metas)
-    };
+    let cfg_metas = vec::concat(vec::filter_map(
+        {|&&i| attr::get_meta_item_list(i)}, cfg_metas));
 
-    for cfg_mi: @ast::meta_item in item_cfg_metas {
+    let has_cfg_metas = vec::len(cfg_metas) > 0u;
+    if !has_cfg_metas { ret true; }
+
+    for cfg_mi: @ast::meta_item in cfg_metas {
         if attr::contains(cfg, cfg_mi) { ret true; }
     }
 

src/comp/front/test.rs

@@ -18,6 +18,7 @@ type test = {span: span, path: [ast::ident], ignore: bool};
 
 type test_ctxt =
     @{sess: session::session,
+      crate: @ast::crate,
       next_node_id: node_id_gen,
       mutable path: [ast::ident],
       mutable testfns: [test]};
@@ -41,6 +42,7 @@ fn modify_for_testing(sess: session::session,
 
     let cx: test_ctxt =
         @{sess: sess,
+          crate: crate,
           next_node_id: next_node_id_fn,
           mutable path: [],
           mutable testfns: []};
@@ -102,7 +104,8 @@ fn fold_item(cx: test_ctxt, &&i: @ast::item, fld: fold::ast_fold) ->
           }
           _ {
             log "this is a test function";
-            let test = {span: i.span, path: cx.path, ignore: is_ignored(i)};
+            let test = {span: i.span,
+                        path: cx.path, ignore: is_ignored(cx, i)};
             cx.testfns += [test];
             log #fmt["have %u test functions", vec::len(cx.testfns)];
           }
@@ -133,8 +136,16 @@ fn is_test_fn(i: @ast::item) -> bool {
     ret has_test_attr && has_test_signature(i);
 }
 
-fn is_ignored(i: @ast::item) -> bool {
-    attr::contains_name(attr::attr_metas(i.attrs), "ignore")
+fn is_ignored(cx: test_ctxt, i: @ast::item) -> bool {
+    let ignoreattrs = attr::find_attrs_by_name(i.attrs, "ignore");
+    let ignoreitems = attr::attr_metas(ignoreattrs);
+    let cfg_metas = vec::concat(vec::filter_map(
+        {|&&i| attr::get_meta_item_list(i)}, ignoreitems));
+    ret if vec::is_not_empty(ignoreitems) {
+        config::metas_in_cfg(cx.crate.node.config, cfg_metas)
+    } else {
+        false
+    }
 }
 
 fn add_test_module(cx: test_ctxt, m: ast::_mod) -> ast::_mod {

src/test/run-pass/test-ignore-cfg.rs

@@ -0,0 +1,31 @@
+// compile-flags: --test --cfg ignorecfg
+// xfail-fast
+// xfail-pretty
+
+use std;
+import std::option;
+import std::vec;
+
+#[test]
+#[ignore(cfg(ignorecfg))]
+fn shouldignore() {
+}
+
+#[test]
+#[ignore(cfg(noignorecfg))]
+fn shouldnotignore() {
+}
+
+#[test]
+fn checktests() {
+    // Pull the tests out of the secret test module
+    let tests = __test::tests();
+
+    let shouldignore = option::get(
+        vec::find({|t| t.name == "shouldignore"}, tests));
+    assert shouldignore.ignore == true;
+
+    let shouldnotignore = option::get(
+        vec::find({|t| t.name == "shouldnotignore"}, tests));
+    assert shouldnotignore.ignore == false;
+}