[gnome-builder] vala: basic find_nearest_scope implementation

[Christian Hergert <chergert src gnome org>]

commit d1135cc6c0774fd5e1cf4b95c2aee67880fa3e37
Author: Christian Hergert <chergert redhat com>
Date:   Wed Jul 5 17:37:24 2017 -0700

    vala: basic find_nearest_scope implementation
    
    Just a very simple implementation of this. I'm sure someone can
    do this better and improve it.

 plugins/vala-pack/ide-vala-symbol-resolver.vala |  115 +++++++++++++++--------
 1 files changed, 74 insertions(+), 41 deletions(-)
---
diff --git a/plugins/vala-pack/ide-vala-symbol-resolver.vala b/plugins/vala-pack/ide-vala-symbol-resolver.vala
index 982a9b7..329ef6a 100644
--- a/plugins/vala-pack/ide-vala-symbol-resolver.vala
+++ b/plugins/vala-pack/ide-vala-symbol-resolver.vala
@@ -37,6 +37,52 @@ namespace Ide
                        return symbol_tree;
                }
 
+               Ide.Symbol? create_symbol (Ide.File file, Vala.Symbol symbol)
+               {
+                       var kind = Ide.SymbolKind.NONE;
+                       if (symbol is Vala.Class)
+                               kind = Ide.SymbolKind.CLASS;
+                       else if (symbol is Vala.Subroutine) {
+                               if (symbol.is_instance_member ())
+                                       kind = Ide.SymbolKind.METHOD;
+                               else
+                                       kind = Ide.SymbolKind.FUNCTION;
+                       }
+                       else if (symbol is Vala.Struct) kind = Ide.SymbolKind.STRUCT;
+                       else if (symbol is Vala.Field) kind = Ide.SymbolKind.FIELD;
+                       else if (symbol is Vala.Enum) kind = Ide.SymbolKind.ENUM;
+                       else if (symbol is Vala.EnumValue) kind = Ide.SymbolKind.ENUM_VALUE;
+                       else if (symbol is Vala.Variable) kind = Ide.SymbolKind.VARIABLE;
+                       else if (symbol is Vala.Namespace) kind = Ide.SymbolKind.NAMESPACE;
+
+                       var flags = Ide.SymbolFlags.NONE;
+                       if (symbol.is_instance_member ())
+                               flags |= Ide.SymbolFlags.IS_MEMBER;
+
+                       var binding = get_member_binding (symbol);
+                       if (binding != null && binding == Vala.MemberBinding.STATIC)
+                               flags |= Ide.SymbolFlags.IS_STATIC;
+
+#if ENABLE_VALA_SYMBOL_GET_DEPRECATED
+                       if (symbol.deprecated)
+#else
+                       if (symbol.version.deprecated)
+#endif
+                               flags |= Ide.SymbolFlags.IS_DEPRECATED;
+
+                       var source_reference = symbol.source_reference;
+
+                       if (source_reference != null) {
+                               var loc = new Ide.SourceLocation (file,
+                                                                                                 
source_reference.begin.line - 1,
+                                                                                                 
source_reference.begin.column - 1,
+                                                                                                 0);
+                               return new Ide.Symbol (symbol.name, kind, flags, loc, loc, loc);
+                       }
+
+                       return null;
+               }
+
                public async Ide.Symbol? lookup_symbol_async (Ide.SourceLocation location,
                                                              GLib.Cancellable? cancellable)
                        throws GLib.Error
@@ -50,46 +96,8 @@ namespace Ide
 
                        Vala.Symbol? symbol = yield index.find_symbol_at (file.get_file (), line, column);
 
-                       if (symbol != null) {
-                               var kind = Ide.SymbolKind.NONE;
-                               if (symbol is Vala.Class) kind = Ide.SymbolKind.CLASS;
-                               else if (symbol is Vala.Subroutine) {
-                                       if (symbol.is_instance_member ())
-                                               kind = Ide.SymbolKind.METHOD;
-                                       else
-                                               kind = Ide.SymbolKind.FUNCTION;
-                               }
-                               else if (symbol is Vala.Struct) kind = Ide.SymbolKind.STRUCT;
-                               else if (symbol is Vala.Field) kind = Ide.SymbolKind.FIELD;
-                               else if (symbol is Vala.Enum) kind = Ide.SymbolKind.ENUM;
-                               else if (symbol is Vala.EnumValue) kind = Ide.SymbolKind.ENUM_VALUE;
-                               else if (symbol is Vala.Variable) kind = Ide.SymbolKind.VARIABLE;
-
-                               var flags = Ide.SymbolFlags.NONE;
-                               if (symbol.is_instance_member ())
-                                       flags |= Ide.SymbolFlags.IS_MEMBER;
-
-                               var binding = get_member_binding (symbol);
-                               if (binding != null && binding == Vala.MemberBinding.STATIC)
-                                       flags |= Ide.SymbolFlags.IS_STATIC;
-
-#if ENABLE_VALA_SYMBOL_GET_DEPRECATED
-                               if (symbol.deprecated)
-#else
-                               if (symbol.version.deprecated)
-#endif
-                                       flags |= Ide.SymbolFlags.IS_DEPRECATED;
-
-                               var source_reference = symbol.source_reference;
-
-                               if (source_reference != null) {
-                                       var loc = new Ide.SourceLocation (file,
-                                                                         source_reference.begin.line - 1,
-                                                                         source_reference.begin.column - 1,
-                                                                         0);
-                                       return new Ide.Symbol (symbol.name, kind, flags, loc, loc, loc);
-                               }
-                       }
+                       if (symbol != null)
+                               return create_symbol (file, symbol);
 
                        return null;
                }
@@ -123,7 +131,32 @@ namespace Ide
                                                                   GLib.Cancellable? cancellable)
                        throws GLib.Error
                {
-                       throw new GLib.IOError.NOT_SUPPORTED ("finding nearest scope is not yet supported");
+                       var context = this.get_context ();
+                       var service = (Ide.ValaService)context.get_service_typed (typeof (Ide.ValaService));
+                       var index = service.index;
+                       var file = location.get_file ();
+                       var line = (int)location.get_line () + 1;
+                       var column = (int)location.get_line_offset () + 1;
+
+                       var symbol = yield index.find_symbol_at (file.get_file (), line, column);
+
+                       while (symbol != null) {
+                               if (symbol is Vala.Class ||
+                                       symbol is Vala.Subroutine ||
+                                       symbol is Vala.Namespace ||
+                                       symbol is Vala.Struct)
+                                       break;
+
+                               if (symbol.owner != null)
+                                       symbol = symbol.owner.owner;
+                               else
+                                       symbol = symbol.parent_symbol;
+                       }
+
+                       if (symbol != null)
+                               return create_symbol (file, symbol);
+
+                       throw new GLib.IOError.NOT_FOUND ("Failed to locate nearest scope");
                }
        }
 }