[gnome-builder/wip/libide] libide: start (re)implementing some basic movements

[Christian Hergert <chergert src gnome org>]

commit e1d79a6acc595b88fd492e9f00ac803b24ac1e55
Author: Christian Hergert <christian hergert me>
Date:   Tue Mar 3 23:54:26 2015 -0800

    libide: start (re)implementing some basic movements

 libide/ide-source-view-movements.c |  207 +++++++++++++++++++++++++++++++++++-
 1 files changed, 206 insertions(+), 1 deletions(-)
---
diff --git a/libide/ide-source-view-movements.c b/libide/ide-source-view-movements.c
index fa6c5d3..c2b0e44 100644
--- a/libide/ide-source-view-movements.c
+++ b/libide/ide-source-view-movements.c
@@ -16,37 +16,242 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#define G_LOG_DOMAIN "ide-source-view"
+
+#include "ide-debug.h"
+#include "ide-enums.h"
 #include "ide-source-view-movements.h"
 
+static void
+ide_source_view_movements_get_selection (IdeSourceView *self,
+                                         GtkTextIter   *insert,
+                                         GtkTextIter   *selection)
+{
+  GtkTextBuffer *buffer;
+  GtkTextMark *mark;
+
+  g_assert (IDE_IS_SOURCE_VIEW (self));
+
+  buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (self));
+
+  if (insert)
+    {
+      mark = gtk_text_buffer_get_insert (buffer);
+      gtk_text_buffer_get_iter_at_mark (buffer, insert, mark);
+    }
+
+  if (selection)
+    {
+      mark = gtk_text_buffer_get_selection_bound (buffer);
+      gtk_text_buffer_get_iter_at_mark (buffer, selection, mark);
+    }
+}
+
+static void
+ide_source_view_movements_select_range (IdeSourceView     *self,
+                                        const GtkTextIter *insert,
+                                        const GtkTextIter *selection,
+                                        gboolean           extend_selection)
+{
+  GtkTextBuffer *buffer;
+
+  g_assert (IDE_IS_SOURCE_VIEW (self));
+
+  buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (self));
+
+  if (extend_selection)
+    gtk_text_buffer_select_range (buffer, insert, selection);
+  else
+    gtk_text_buffer_select_range (buffer, insert, insert);
+}
+
+static void
+ide_source_view_movements_nth_char (IdeSourceView         *self,
+                                    IdeSourceViewMovement  movement,
+                                    gboolean               extend_selection,
+                                    gint                   param)
+{
+  GtkTextIter insert;
+  GtkTextIter selection;
+
+  ide_source_view_movements_get_selection (self, &insert, &selection);
+
+  gtk_text_iter_set_line_offset (&insert, 0);
+
+  for (; param > 0; param--)
+    {
+      if (gtk_text_iter_ends_line (&insert))
+        break;
+      gtk_text_iter_forward_char (&insert);
+    }
+
+  ide_source_view_movements_select_range (self, &insert, &selection, extend_selection);
+}
+
+static void
+ide_source_view_movements_previous_char (IdeSourceView         *self,
+                                         IdeSourceViewMovement  movement,
+                                         gboolean               extend_selection,
+                                         gint                   param)
+{
+  GtkTextIter insert;
+  GtkTextIter selection;
+
+  param = MAX (1, param);
+
+  ide_source_view_movements_get_selection (self, &insert, &selection);
+
+  for (; param; param--)
+    {
+      if (gtk_text_iter_starts_line (&insert))
+        break;
+      gtk_text_iter_backward_char (&insert);
+    }
+
+  ide_source_view_movements_select_range (self, &insert, &selection, extend_selection);
+}
+
+static void
+ide_source_view_movements_next_char (IdeSourceView         *self,
+                                     IdeSourceViewMovement  movement,
+                                     gboolean               extend_selection,
+                                     gint                   param)
+{
+  GtkTextIter insert;
+  GtkTextIter selection;
+
+  param = MAX (1, param);
+
+  ide_source_view_movements_get_selection (self, &insert, &selection);
+
+  for (; param; param--)
+    {
+      if (gtk_text_iter_ends_line (&insert))
+        break;
+      gtk_text_iter_forward_char (&insert);
+    }
+
+  ide_source_view_movements_select_range (self, &insert, &selection, extend_selection);
+}
+
+static void
+ide_source_view_movements_first_char (IdeSourceView         *self,
+                                      IdeSourceViewMovement  movement,
+                                      gboolean               extend_selection,
+                                      gint                   param)
+{
+  GtkTextIter insert;
+  GtkTextIter selection;
+
+  ide_source_view_movements_get_selection (self, &insert, &selection);
+
+  gtk_text_iter_set_line_offset (&insert, 0);
+
+  ide_source_view_movements_select_range (self, &insert, &selection, extend_selection);
+}
+
+static void
+ide_source_view_movements_first_nonspace_char (IdeSourceView         *self,
+                                               IdeSourceViewMovement  movement,
+                                               gboolean               extend_selection,
+                                               gint                   param)
+{
+  GtkTextIter insert;
+  GtkTextIter selection;
+  gunichar ch;
+
+  ide_source_view_movements_get_selection (self, &insert, &selection);
+
+  gtk_text_iter_set_line_offset (&insert, 0);
+
+  while (!gtk_text_iter_ends_line (&insert) &&
+         (ch = gtk_text_iter_get_char (&insert)) &&
+         g_unichar_isspace (ch))
+    gtk_text_iter_forward_char (&insert);
+
+  ide_source_view_movements_select_range (self, &insert, &selection, extend_selection);
+}
+
+static void
+ide_source_view_movements_middle_char (IdeSourceView         *self,
+                                       IdeSourceViewMovement  movement,
+                                       gboolean               extend_selection,
+                                       gint                   param)
+{
+  GtkTextIter insert;
+  GtkTextIter selection;
+  guint line_offset;
+
+  ide_source_view_movements_get_selection (self, &insert, &selection);
+
+  gtk_text_iter_forward_to_line_end (&insert);
+  line_offset = gtk_text_iter_get_line_offset (&insert);
+  gtk_text_iter_set_line_offset (&insert, line_offset >> 1);
+
+  ide_source_view_movements_select_range (self, &insert, &selection, extend_selection);
+}
+
+static void
+ide_source_view_movements_last_char (IdeSourceView         *self,
+                                     IdeSourceViewMovement  movement,
+                                     gboolean               extend_selection,
+                                     gint                   param)
+{
+  GtkTextIter insert;
+  GtkTextIter selection;
+
+  ide_source_view_movements_get_selection (self, &insert, &selection);
+
+  gtk_text_iter_forward_to_line_end (&insert);
+
+  ide_source_view_movements_select_range (self, &insert, &selection, extend_selection);
+}
+
 void
 _ide_source_view_apply_movement (IdeSourceView         *self,
                                  IdeSourceViewMovement  movement,
                                  gboolean               extend_selection,
                                  gint                   param)
 {
-  g_assert (IDE_IS_SOURCE_VIEW (self));
+#ifndef IDE_DISABLE_TRACE
+  {
+    GEnumValue *enum_value;
+    GEnumClass *enum_class;
+
+    enum_class = g_type_class_peek (IDE_TYPE_SOURCE_VIEW_MOVEMENT);
+    enum_value = g_enum_get_value (enum_class, movement);
+    IDE_TRACE_MSG ("apply movement: %s", enum_value->value_nick);
+  }
+#endif
 
   switch (movement)
     {
     case IDE_SOURCE_VIEW_MOVEMENT_NTH_CHAR:
+      ide_source_view_movements_nth_char (self, movement, extend_selection, param);
       break;
 
     case IDE_SOURCE_VIEW_MOVEMENT_PREVIOUS_CHAR:
+      ide_source_view_movements_previous_char (self, movement, extend_selection, param);
       break;
 
     case IDE_SOURCE_VIEW_MOVEMENT_NEXT_CHAR:
+      ide_source_view_movements_next_char (self, movement, extend_selection, param);
       break;
 
     case IDE_SOURCE_VIEW_MOVEMENT_FIRST_CHAR:
+      ide_source_view_movements_first_char (self, movement, extend_selection, param);
       break;
 
     case IDE_SOURCE_VIEW_MOVEMENT_FIRST_NONSPACE_CHAR:
+      ide_source_view_movements_first_nonspace_char (self, movement, extend_selection, param);
       break;
 
     case IDE_SOURCE_VIEW_MOVEMENT_MIDDLE_CHAR:
+      ide_source_view_movements_middle_char (self, movement, extend_selection, param);
       break;
 
     case IDE_SOURCE_VIEW_MOVEMENT_LAST_CHAR:
+      ide_source_view_movements_last_char (self, movement, extend_selection, param);
       break;
 
     case IDE_SOURCE_VIEW_MOVEMENT_PREVIOUS_WORD_START: