[gnome-builder] clang: implement IdeSymbolResolver.find_nearest_scope_async()

[Christian Hergert <chergert src gnome org>]

commit 93b90df07c0d4eb35b6bc47552347b731756ee2f
Author: Christian Hergert <chergert redhat com>
Date:   Mon Jul 3 17:07:11 2017 -0700

    clang: implement IdeSymbolResolver.find_nearest_scope_async()
    
    This is an implementation using new API in
    IdeClangTranslationUnit to find the nearest scope given an
    IdeSourceLocation.
    
    Signed-off-by: Christian Hergert <chergert redhat com>

 plugins/clang/ide-clang-symbol-resolver.c |   93 +++++++++++++++++++++++++++++
 1 files changed, 93 insertions(+), 0 deletions(-)
---
diff --git a/plugins/clang/ide-clang-symbol-resolver.c b/plugins/clang/ide-clang-symbol-resolver.c
index 32bbd79..8d766ff 100644
--- a/plugins/clang/ide-clang-symbol-resolver.c
+++ b/plugins/clang/ide-clang-symbol-resolver.c
@@ -238,6 +238,97 @@ ide_clang_symbol_resolver_get_symbol_tree_finish (IdeSymbolResolver  *resolver,
 }
 
 static void
+ide_clang_symbol_resolver_find_scope_cb (GObject      *object,
+                                         GAsyncResult *result,
+                                         gpointer      user_data)
+{
+  IdeClangService *service = (IdeClangService *)object;
+  g_autoptr(IdeClangTranslationUnit) unit = NULL;
+  g_autoptr(GTask) task = user_data;
+  g_autoptr(IdeSymbol) symbol = NULL;
+  g_autoptr(GError) error = NULL;
+  IdeSourceLocation *location;
+
+  g_assert (IDE_IS_CLANG_SERVICE (service));
+  g_assert (G_IS_ASYNC_RESULT (result));
+  g_assert (G_IS_TASK (task));
+
+  unit = ide_clang_service_get_translation_unit_finish (service, result, &error);
+
+  if (unit == NULL)
+    {
+      g_task_return_error (task, g_steal_pointer (&error));
+      return;
+    }
+
+  location = g_task_get_task_data (task);
+  symbol = ide_clang_translation_unit_find_nearest_scope (unit, location, &error);
+
+  if (symbol == NULL)
+    g_task_return_error (task, g_steal_pointer (&error));
+  else
+    g_task_return_pointer (task,
+                           g_steal_pointer (&symbol),
+                           (GDestroyNotify) ide_symbol_unref);
+}
+
+static void
+ide_clang_symbol_resolver_find_nearest_scope_async (IdeSymbolResolver   *symbol_resolver,
+                                                    IdeSourceLocation   *location,
+                                                    GCancellable        *cancellable,
+                                                    GAsyncReadyCallback  callback,
+                                                    gpointer             user_data)
+{
+  IdeClangSymbolResolver *self = (IdeClangSymbolResolver *)symbol_resolver;
+  g_autoptr(GTask) task = NULL;
+  IdeClangService *service;
+  IdeContext *context;
+  IdeFile *file;
+
+  IDE_ENTRY;
+
+  g_return_if_fail (IDE_IS_CLANG_SYMBOL_RESOLVER (self));
+  g_return_if_fail (location != NULL);
+
+  task = g_task_new (self, cancellable, callback, user_data);
+  g_task_set_priority (task, G_PRIORITY_LOW);
+  g_task_set_source_tag (task, ide_clang_symbol_resolver_find_nearest_scope_async);
+  g_task_set_task_data (task,
+                        ide_source_location_ref (location),
+                        (GDestroyNotify) ide_source_location_unref);
+
+  context = ide_object_get_context (IDE_OBJECT (self));
+  service = ide_context_get_service_typed (context, IDE_TYPE_CLANG_SERVICE);
+  file = ide_source_location_get_file (location);
+
+  ide_clang_service_get_translation_unit_async (service,
+                                                file,
+                                                0,
+                                                cancellable,
+                                                ide_clang_symbol_resolver_find_scope_cb,
+                                                g_steal_pointer (&task));
+
+  IDE_EXIT;
+}
+
+static IdeSymbol *
+ide_clang_symbol_resolver_find_nearest_scope_finish (IdeSymbolResolver  *resolver,
+                                                     GAsyncResult       *result,
+                                                     GError            **error)
+{
+  IdeSymbol *ret;
+
+  IDE_ENTRY;
+
+  g_return_val_if_fail (IDE_IS_CLANG_SYMBOL_RESOLVER (resolver), NULL);
+  g_return_val_if_fail (G_IS_TASK (result), NULL);
+
+  ret = g_task_propagate_pointer (G_TASK (result), error);
+
+  IDE_RETURN (ret);
+}
+
+static void
 ide_clang_symbol_resolver_class_init (IdeClangSymbolResolverClass *klass)
 {
 }
@@ -249,6 +340,8 @@ symbol_resolver_iface_init (IdeSymbolResolverInterface *iface)
   iface->lookup_symbol_finish = ide_clang_symbol_resolver_lookup_symbol_finish;
   iface->get_symbol_tree_async = ide_clang_symbol_resolver_get_symbol_tree_async;
   iface->get_symbol_tree_finish = ide_clang_symbol_resolver_get_symbol_tree_finish;
+  iface->find_nearest_scope_async = ide_clang_symbol_resolver_find_nearest_scope_async;
+  iface->find_nearest_scope_finish = ide_clang_symbol_resolver_find_nearest_scope_finish;
 }
 
 static void