[gnome-builder/wip/libide] libide: add IdeBufferChangeMonitor

[Christian Hergert <chergert src gnome org>]

commit 6ef11376aa9def8cd98ef1f9ffebc3bb99e246f2
Author: Christian Hergert <christian hergert me>
Date:   Thu Feb 26 16:39:34 2015 -0800

    libide: add IdeBufferChangeMonitor
    
    This class provides an abstraction for the VCS implementations to optimize
    change tracking for a particular file. Since not all VCS implementations
    will behave the same way, this allows for them to use a few tricks to
    optimize lookups.

 libide/Makefile.am                 |    2 +
 libide/ide-buffer-change-monitor.c |  125 ++++++++++++++++++++++++++++++++++++
 libide/ide-buffer-change-monitor.h |   57 ++++++++++++++++
 libide/ide-types.h                 |    2 +
 4 files changed, 186 insertions(+), 0 deletions(-)
---
diff --git a/libide/Makefile.am b/libide/Makefile.am
index 491c2ce..48b7c71 100644
--- a/libide/Makefile.am
+++ b/libide/Makefile.am
@@ -42,6 +42,8 @@ libide_1_0_la_public_sources = \
        libide/ide-back-forward-item.h \
        libide/ide-back-forward-list.c \
        libide/ide-back-forward-list.h \
+       libide/ide-buffer-change-monitor.c \
+       libide/ide-buffer-change-monitor.h \
        libide/ide-buffer-manager.c \
        libide/ide-buffer-manager.h \
        libide/ide-buffer.c \
diff --git a/libide/ide-buffer-change-monitor.c b/libide/ide-buffer-change-monitor.c
new file mode 100644
index 0000000..ed8de6c
--- /dev/null
+++ b/libide/ide-buffer-change-monitor.c
@@ -0,0 +1,125 @@
+/* ide-buffer-change-monitor.c
+ *
+ * Copyright (C) 2015 Christian Hergert <christian hergert me>
+ *
+ * This file is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This file is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <glib/gi18n.h>
+
+#include "ide-buffer.h"
+#include "ide-buffer-change-monitor.h"
+
+G_DEFINE_TYPE (IdeBufferChangeMonitor, ide_buffer_change_monitor, IDE_TYPE_OBJECT)
+
+enum {
+  PROP_0,
+  PROP_BUFFER,
+  LAST_PROP
+};
+
+enum {
+  CHANGED,
+  LAST_SIGNAL
+};
+
+static GParamSpec *gParamSpecs [LAST_PROP];
+static guint gSignals [LAST_SIGNAL];
+
+IdeBufferLineChange
+ide_buffer_change_monitor_get_change (IdeBufferChangeMonitor *self,
+                                      const GtkTextIter      *iter)
+{
+  g_return_val_if_fail (IDE_IS_BUFFER_CHANGE_MONITOR (self), IDE_BUFFER_LINE_CHANGE_NONE);
+  g_return_val_if_fail (iter, IDE_BUFFER_LINE_CHANGE_NONE);
+
+  if (IDE_BUFFER_CHANGE_MONITOR_GET_CLASS (self)->get_change)
+    return IDE_BUFFER_CHANGE_MONITOR_GET_CLASS (self)->get_change (self, iter);
+
+  g_warning ("%s does not implement get_change() vfunc",
+             g_type_name (G_TYPE_FROM_INSTANCE (self)));
+
+  return IDE_BUFFER_LINE_CHANGE_NONE;
+}
+
+static void
+ide_buffer_change_monitor_set_buffer (IdeBufferChangeMonitor *self,
+                                      IdeBuffer              *buffer)
+{
+  g_return_if_fail (IDE_IS_BUFFER_CHANGE_MONITOR (self));
+  g_return_if_fail (IDE_IS_BUFFER (buffer));
+
+  if (IDE_BUFFER_CHANGE_MONITOR_GET_CLASS (self)->set_buffer)
+    IDE_BUFFER_CHANGE_MONITOR_GET_CLASS (self)->set_buffer (self, buffer);
+  else
+    g_warning ("%s does not implement set_buffer() vfunc",
+               g_type_name (G_TYPE_FROM_INSTANCE (self)));
+}
+
+void
+ide_buffer_change_monitor_emit_changed (IdeBufferChangeMonitor *self)
+{
+  g_return_if_fail (IDE_IS_BUFFER_CHANGE_MONITOR (self));
+
+  g_signal_emit (self, gSignals [CHANGED], 0);
+}
+
+static void
+ide_buffer_change_monitor_set_property (GObject      *object,
+                                        guint         prop_id,
+                                        const GValue *value,
+                                        GParamSpec   *pspec)
+{
+  IdeBufferChangeMonitor *self = IDE_BUFFER_CHANGE_MONITOR (object);
+
+  switch (prop_id)
+    {
+    case PROP_BUFFER:
+      ide_buffer_change_monitor_set_buffer (self, g_value_get_object (value));
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+    }
+}
+
+static void
+ide_buffer_change_monitor_class_init (IdeBufferChangeMonitorClass *klass)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (klass);
+
+  object_class->set_property = ide_buffer_change_monitor_set_property;
+
+  gParamSpecs [PROP_BUFFER] =
+    g_param_spec_object ("buffer",
+                         _("Buffer"),
+                         _("The IdeBuffer to be monitored."),
+                         IDE_TYPE_BUFFER,
+                         (G_PARAM_WRITABLE | G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_STRINGS));
+  g_object_class_install_property (object_class, PROP_BUFFER, gParamSpecs [PROP_BUFFER]);
+
+  gSignals [CHANGED] = g_signal_new ("changed",
+                                     G_TYPE_FROM_CLASS (klass),
+                                     G_SIGNAL_RUN_LAST,
+                                     0,
+                                     NULL, NULL,
+                                     g_cclosure_marshal_VOID__VOID,
+                                     G_TYPE_NONE,
+                                     0);
+}
+
+static void
+ide_buffer_change_monitor_init (IdeBufferChangeMonitor *self)
+{
+}
diff --git a/libide/ide-buffer-change-monitor.h b/libide/ide-buffer-change-monitor.h
new file mode 100644
index 0000000..3de4771
--- /dev/null
+++ b/libide/ide-buffer-change-monitor.h
@@ -0,0 +1,57 @@
+/* ide-buffer-change-monitor.h
+ *
+ * Copyright (C) 2015 Christian Hergert <christian hergert me>
+ *
+ * This file is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This file is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef IDE_BUFFER_CHANGE_MONITOR_H
+#define IDE_BUFFER_CHANGE_MONITOR_H
+
+#include <gtk/gtk.h>
+
+#include "ide-object.h"
+
+G_BEGIN_DECLS
+
+#define IDE_TYPE_BUFFER_CHANGE_MONITOR (ide_buffer_change_monitor_get_type())
+
+G_DECLARE_DERIVABLE_TYPE (IdeBufferChangeMonitor, ide_buffer_change_monitor,
+                          IDE, BUFFER_CHANGE_MONITOR, IdeObject)
+
+typedef enum
+{
+  IDE_BUFFER_LINE_CHANGE_NONE    = 0,
+  IDE_BUFFER_LINE_CHANGE_ADDED   = 1,
+  IDE_BUFFER_LINE_CHANGE_CHANGED = 2,
+  IDE_BUFFER_LINE_CHANGE_DELETED = 3,
+} IdeBufferLineChange;
+
+struct _IdeBufferChangeMonitorClass
+{
+  IdeObjectClass parent;
+
+  void                (*set_buffer) (IdeBufferChangeMonitor *self,
+                                     IdeBuffer              *buffer);
+  IdeBufferLineChange (*get_change) (IdeBufferChangeMonitor *self,
+                                     const GtkTextIter      *iter);
+};
+
+IdeBufferLineChange ide_buffer_change_monitor_get_change   (IdeBufferChangeMonitor *self,
+                                                            const GtkTextIter      *iter);
+void                ide_buffer_change_monitor_emit_changed (IdeBufferChangeMonitor *self);
+
+G_END_DECLS
+
+#endif /* IDE_BUFFER_CHANGE_MONITOR_H */
diff --git a/libide/ide-types.h b/libide/ide-types.h
index 43db87d..2392c91 100644
--- a/libide/ide-types.h
+++ b/libide/ide-types.h
@@ -43,6 +43,8 @@ typedef struct _IdeBackForwardList             IdeBackForwardList;
 
 typedef struct _IdeBuffer                      IdeBuffer;
 
+typedef struct _IdeBufferChangeMonitor         IdeBufferChangeMonitor;
+
 typedef struct _IdeBufferManager               IdeBufferManager;
 
 typedef struct _IdeBuilder                     IdeBuilder;