[gnome-builder/wip/slaf/vim-textobjects] vim-iter: add *_find_char with acces to the iter

[Sébastien Lafargue <slafargue src gnome org>]

commit 6f2ea4783ad46be97b370f4f43f596a91f411d62
Author: Sebastien Lafargue <slafargue gnome org>
Date:   Sat Oct 24 22:45:40 2015 +0200

    vim-iter: add *_find_char with acces to the iter

 libide/ide-vim-iter.c |   66 +++++++++++++++++++++++++++++++++++++++++++++++++
 libide/ide-vim-iter.h |   30 +++++++++++++++-------
 2 files changed, 86 insertions(+), 10 deletions(-)
---
diff --git a/libide/ide-vim-iter.c b/libide/ide-vim-iter.c
index d03b829..69547e9 100644
--- a/libide/ide-vim-iter.c
+++ b/libide/ide-vim-iter.c
@@ -455,3 +455,69 @@ _ide_vim_iter_backward_WORD_end (GtkTextIter *iter)
 {
   return _ide_vim_iter_backward_classified_end (iter, _ide_vim_WORD_classify);
 }
+
+static gboolean
+matches_pred (GtkTextIter          *iter,
+              VimIterCharPredicate  pred,
+              gpointer              user_data)
+{
+  gint ch;
+
+  ch = gtk_text_iter_get_char (iter);
+
+  return (*pred) (iter, ch, user_data);
+}
+
+/* Similar to gtk_text_iter_forward_find_char but
+ * lets us acces to the iter in the predicate
+ */
+gboolean
+_ide_vim_iter_forward_find_char (GtkTextIter          *iter,
+                                 VimIterCharPredicate  pred,
+                                 gpointer              user_data,
+                                 const GtkTextIter    *limit)
+{
+  g_return_val_if_fail (iter != NULL, FALSE);
+  g_return_val_if_fail (pred != NULL, FALSE);
+
+  if (limit &&
+      gtk_text_iter_compare (iter, limit) >= 0)
+    return FALSE;
+
+  while ((limit == NULL ||
+          !gtk_text_iter_equal (limit, iter)) &&
+         gtk_text_iter_forward_char (iter))
+    {
+      if (matches_pred (iter, pred, user_data))
+        return TRUE;
+    }
+
+  return FALSE;
+}
+
+/* Similar to gtk_text_iter_backward_find_char but
+ * lets us acces to the iter in the predicate
+ */
+gboolean
+_ide_vim_iter_backward_find_char (GtkTextIter          *iter,
+                                  VimIterCharPredicate  pred,
+                                  gpointer              user_data,
+                                  const GtkTextIter    *limit)
+{
+  g_return_val_if_fail (iter != NULL, FALSE);
+  g_return_val_if_fail (pred != NULL, FALSE);
+
+  if (limit &&
+      gtk_text_iter_compare (iter, limit) <= 0)
+    return FALSE;
+
+  while ((limit == NULL ||
+          !gtk_text_iter_equal (limit, iter)) &&
+         gtk_text_iter_backward_char (iter))
+    {
+      if (matches_pred (iter, pred, user_data))
+        return TRUE;
+    }
+
+  return FALSE;
+}
diff --git a/libide/ide-vim-iter.h b/libide/ide-vim-iter.h
index 3777238..735a21c 100644
--- a/libide/ide-vim-iter.h
+++ b/libide/ide-vim-iter.h
@@ -23,16 +23,26 @@
 
 G_BEGIN_DECLS
 
-gboolean _ide_vim_iter_forward_word_start       (GtkTextIter *iter);
-gboolean _ide_vim_iter_forward_WORD_start       (GtkTextIter *iter);
-gboolean _ide_vim_iter_forward_word_end         (GtkTextIter *iter);
-gboolean _ide_vim_iter_forward_WORD_end         (GtkTextIter *iter);
-gboolean _ide_vim_iter_backward_paragraph_start (GtkTextIter *iter);
-gboolean _ide_vim_iter_forward_paragraph_end    (GtkTextIter *iter);
-gboolean _ide_vim_iter_backward_sentence_start  (GtkTextIter *iter);
-gboolean _ide_vim_iter_forward_sentence_end     (GtkTextIter *iter);
-gboolean _ide_vim_iter_backward_WORD_end        (GtkTextIter *iter);
-gboolean _ide_vim_iter_backward_word_end        (GtkTextIter *iter);
+typedef gboolean (* VimIterCharPredicate) (GtkTextIter *iter, gunichar ch, gpointer user_data);
+
+gboolean _ide_vim_iter_forward_find_char        (GtkTextIter          *iter,
+                                                 VimIterCharPredicate  pred,
+                                                 gpointer              user_data,
+                                                 const GtkTextIter    *limit);
+gboolean _ide_vim_iter_backward_find_char       (GtkTextIter          *iter,
+                                                 VimIterCharPredicate  pred,
+                                                 gpointer              user_data,
+                                                 const GtkTextIter    *limit);
+gboolean _ide_vim_iter_forward_word_start       (GtkTextIter          *iter);
+gboolean _ide_vim_iter_forward_WORD_start       (GtkTextIter          *iter);
+gboolean _ide_vim_iter_forward_word_end         (GtkTextIter          *iter);
+gboolean _ide_vim_iter_forward_WORD_end         (GtkTextIter          *iter);
+gboolean _ide_vim_iter_backward_paragraph_start (GtkTextIter          *iter);
+gboolean _ide_vim_iter_forward_paragraph_end    (GtkTextIter          *iter);
+gboolean _ide_vim_iter_backward_sentence_start  (GtkTextIter          *iter);
+gboolean _ide_vim_iter_forward_sentence_end     (GtkTextIter          *iter);
+gboolean _ide_vim_iter_backward_WORD_end        (GtkTextIter          *iter);
+gboolean _ide_vim_iter_backward_word_end        (GtkTextIter          *iter);
 
 G_END_DECLS