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-rwxr-xr-xgedit/gedittextregion.c647
1 files changed, 647 insertions, 0 deletions
diff --git a/gedit/gedittextregion.c b/gedit/gedittextregion.c
new file mode 100755
index 00000000..f6790489
--- /dev/null
+++ b/gedit/gedittextregion.c
@@ -0,0 +1,647 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*-
+ *
+ * gedittextregion.h - GtkTextMark based region utility functions
+ *
+ * This file is part of the GtkSourceView widget
+ *
+ * Copyright (C) 2002 Gustavo Gir�ldez <[email protected]>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <glib.h>
+
+#include "gedittextregion.h"
+
+
+#undef ENABLE_DEBUG
+/*
+#define ENABLE_DEBUG
+*/
+
+#ifdef ENABLE_DEBUG
+#define DEBUG(x) (x)
+#else
+#define DEBUG(x)
+#endif
+
+typedef struct _Subregion {
+ GtkTextMark *start;
+ GtkTextMark *end;
+} Subregion;
+
+struct _GeditTextRegion {
+ GtkTextBuffer *buffer;
+ GList *subregions;
+ guint32 time_stamp;
+};
+
+typedef struct _GeditTextRegionIteratorReal GeditTextRegionIteratorReal;
+
+struct _GeditTextRegionIteratorReal {
+ GeditTextRegion *region;
+ guint32 region_time_stamp;
+
+ GList *subregions;
+};
+
+
+/* ----------------------------------------------------------------------
+ Private interface
+ ---------------------------------------------------------------------- */
+
+/* Find and return a subregion node which contains the given text
+ iter. If left_side is TRUE, return the subregion which contains
+ the text iter or which is the leftmost; else return the rightmost
+ subregion */
+static GList *
+find_nearest_subregion (GeditTextRegion *region,
+ const GtkTextIter *iter,
+ GList *begin,
+ gboolean leftmost,
+ gboolean include_edges)
+{
+ GList *l, *retval;
+
+ g_return_val_if_fail (region != NULL && iter != NULL, NULL);
+
+ if (!begin)
+ begin = region->subregions;
+
+ if (begin)
+ retval = begin->prev;
+ else
+ retval = NULL;
+
+ for (l = begin; l; l = l->next) {
+ GtkTextIter sr_iter;
+ Subregion *sr = l->data;
+ gint cmp;
+
+ if (!leftmost) {
+ gtk_text_buffer_get_iter_at_mark (region->buffer, &sr_iter, sr->end);
+ cmp = gtk_text_iter_compare (iter, &sr_iter);
+ if (cmp < 0 || (cmp == 0 && include_edges)) {
+ retval = l;
+ break;
+ }
+
+ } else {
+ gtk_text_buffer_get_iter_at_mark (region->buffer, &sr_iter, sr->start);
+ cmp = gtk_text_iter_compare (iter, &sr_iter);
+ if (cmp > 0 || (cmp == 0 && include_edges))
+ retval = l;
+ else
+ break;
+ }
+ }
+ return retval;
+}
+
+/* ----------------------------------------------------------------------
+ Public interface
+ ---------------------------------------------------------------------- */
+
+GeditTextRegion *
+gedit_text_region_new (GtkTextBuffer *buffer)
+{
+ GeditTextRegion *region;
+
+ g_return_val_if_fail (buffer != NULL, NULL);
+
+ region = g_new (GeditTextRegion, 1);
+ region->buffer = buffer;
+ region->subregions = NULL;
+ region->time_stamp = 0;
+
+ return region;
+}
+
+void
+gedit_text_region_destroy (GeditTextRegion *region, gboolean delete_marks)
+{
+ g_return_if_fail (region != NULL);
+
+ while (region->subregions) {
+ Subregion *sr = region->subregions->data;
+ if (delete_marks) {
+ gtk_text_buffer_delete_mark (region->buffer, sr->start);
+ gtk_text_buffer_delete_mark (region->buffer, sr->end);
+ }
+ g_free (sr);
+ region->subregions = g_list_delete_link (region->subregions,
+ region->subregions);
+ }
+ region->buffer = NULL;
+ region->time_stamp = 0;
+
+ g_free (region);
+}
+
+GtkTextBuffer *
+gedit_text_region_get_buffer (GeditTextRegion *region)
+{
+ g_return_val_if_fail (region != NULL, NULL);
+
+ return region->buffer;
+}
+
+static void
+gedit_text_region_clear_zero_length_subregions (GeditTextRegion *region)
+{
+ GtkTextIter start, end;
+ GList *node;
+
+ g_return_if_fail (region != NULL);
+
+ for (node = region->subregions; node; ) {
+ Subregion *sr = node->data;
+ gtk_text_buffer_get_iter_at_mark (region->buffer, &start, sr->start);
+ gtk_text_buffer_get_iter_at_mark (region->buffer, &end, sr->end);
+ if (gtk_text_iter_equal (&start, &end)) {
+ gtk_text_buffer_delete_mark (region->buffer, sr->start);
+ gtk_text_buffer_delete_mark (region->buffer, sr->end);
+ g_free (sr);
+ if (node == region->subregions)
+ region->subregions = node = g_list_delete_link (node, node);
+ else
+ node = g_list_delete_link (node, node);
+
+ ++region->time_stamp;
+
+ } else {
+ node = node->next;
+ }
+ }
+}
+
+void
+gedit_text_region_add (GeditTextRegion *region,
+ const GtkTextIter *_start,
+ const GtkTextIter *_end)
+{
+ GList *start_node, *end_node;
+ GtkTextIter start, end;
+
+ g_return_if_fail (region != NULL && _start != NULL && _end != NULL);
+
+ start = *_start;
+ end = *_end;
+
+ DEBUG (g_print ("---\n"));
+ DEBUG (gedit_text_region_debug_print (region));
+ DEBUG (g_message ("region_add (%d, %d)",
+ gtk_text_iter_get_offset (&start),
+ gtk_text_iter_get_offset (&end)));
+
+ gtk_text_iter_order (&start, &end);
+
+ /* don't add zero-length regions */
+ if (gtk_text_iter_equal (&start, &end))
+ return;
+
+ /* find bounding subregions */
+ start_node = find_nearest_subregion (region, &start, NULL, FALSE, TRUE);
+ end_node = find_nearest_subregion (region, &end, start_node, TRUE, TRUE);
+
+ if (start_node == NULL || end_node == NULL || end_node == start_node->prev) {
+ /* create the new subregion */
+ Subregion *sr = g_new0 (Subregion, 1);
+ sr->start = gtk_text_buffer_create_mark (region->buffer, NULL, &start, TRUE);
+ sr->end = gtk_text_buffer_create_mark (region->buffer, NULL, &end, FALSE);
+
+ if (start_node == NULL) {
+ /* append the new region */
+ region->subregions = g_list_append (region->subregions, sr);
+
+ } else if (end_node == NULL) {
+ /* prepend the new region */
+ region->subregions = g_list_prepend (region->subregions, sr);
+
+ } else {
+ /* we are in the middle of two subregions */
+ region->subregions = g_list_insert_before (region->subregions,
+ start_node, sr);
+ }
+ }
+ else {
+ GtkTextIter iter;
+ Subregion *sr = start_node->data;
+ if (start_node != end_node) {
+ /* we need to merge some subregions */
+ GList *l = start_node->next;
+ Subregion *q;
+
+ gtk_text_buffer_delete_mark (region->buffer, sr->end);
+ while (l != end_node) {
+ q = l->data;
+ gtk_text_buffer_delete_mark (region->buffer, q->start);
+ gtk_text_buffer_delete_mark (region->buffer, q->end);
+ g_free (q);
+ l = g_list_delete_link (l, l);
+ }
+ q = l->data;
+ gtk_text_buffer_delete_mark (region->buffer, q->start);
+ sr->end = q->end;
+ g_free (q);
+ l = g_list_delete_link (l, l);
+ }
+ /* now move marks if that action expands the region */
+ gtk_text_buffer_get_iter_at_mark (region->buffer, &iter, sr->start);
+ if (gtk_text_iter_compare (&iter, &start) > 0)
+ gtk_text_buffer_move_mark (region->buffer, sr->start, &start);
+ gtk_text_buffer_get_iter_at_mark (region->buffer, &iter, sr->end);
+ if (gtk_text_iter_compare (&iter, &end) < 0)
+ gtk_text_buffer_move_mark (region->buffer, sr->end, &end);
+ }
+
+ ++region->time_stamp;
+
+ DEBUG (gedit_text_region_debug_print (region));
+}
+
+void
+gedit_text_region_subtract (GeditTextRegion *region,
+ const GtkTextIter *_start,
+ const GtkTextIter *_end)
+{
+ GList *start_node, *end_node, *node;
+ GtkTextIter sr_start_iter, sr_end_iter;
+ gboolean done;
+ gboolean start_is_outside, end_is_outside;
+ Subregion *sr;
+ GtkTextIter start, end;
+
+ g_return_if_fail (region != NULL && _start != NULL && _end != NULL);
+
+ start = *_start;
+ end = *_end;
+
+ DEBUG (g_print ("---\n"));
+ DEBUG (gedit_text_region_debug_print (region));
+ DEBUG (g_message ("region_substract (%d, %d)",
+ gtk_text_iter_get_offset (&start),
+ gtk_text_iter_get_offset (&end)));
+
+ gtk_text_iter_order (&start, &end);
+
+ /* find bounding subregions */
+ start_node = find_nearest_subregion (region, &start, NULL, FALSE, FALSE);
+ end_node = find_nearest_subregion (region, &end, start_node, TRUE, FALSE);
+
+ /* easy case first */
+ if (start_node == NULL || end_node == NULL || end_node == start_node->prev)
+ return;
+
+ /* deal with the start point */
+ start_is_outside = end_is_outside = FALSE;
+
+ sr = start_node->data;
+ gtk_text_buffer_get_iter_at_mark (region->buffer, &sr_start_iter, sr->start);
+ gtk_text_buffer_get_iter_at_mark (region->buffer, &sr_end_iter, sr->end);
+
+ if (gtk_text_iter_in_range (&start, &sr_start_iter, &sr_end_iter) &&
+ !gtk_text_iter_equal (&start, &sr_start_iter)) {
+ /* the starting point is inside the first subregion */
+ if (gtk_text_iter_in_range (&end, &sr_start_iter, &sr_end_iter) &&
+ !gtk_text_iter_equal (&end, &sr_end_iter)) {
+ /* the ending point is also inside the first
+ subregion: we need to split */
+ Subregion *new_sr = g_new0 (Subregion, 1);
+ new_sr->end = sr->end;
+ new_sr->start = gtk_text_buffer_create_mark (region->buffer,
+ NULL, &end, TRUE);
+ start_node = g_list_insert_before (start_node, start_node->next, new_sr);
+
+ sr->end = gtk_text_buffer_create_mark (region->buffer,
+ NULL, &start, FALSE);
+
+ /* no further processing needed */
+ DEBUG (g_message ("subregion splitted"));
+
+ return;
+ } else {
+ /* the ending point is outside, so just move
+ the end of the subregion to the starting point */
+ gtk_text_buffer_move_mark (region->buffer, sr->end, &start);
+ }
+ } else {
+ /* the starting point is outside (and so to the left)
+ of the first subregion */
+ DEBUG (g_message ("start is outside"));
+
+ start_is_outside = TRUE;
+ }
+
+ /* deal with the end point */
+ if (start_node != end_node) {
+ sr = end_node->data;
+ gtk_text_buffer_get_iter_at_mark (region->buffer, &sr_start_iter, sr->start);
+ gtk_text_buffer_get_iter_at_mark (region->buffer, &sr_end_iter, sr->end);
+ }
+
+ if (gtk_text_iter_in_range (&end, &sr_start_iter, &sr_end_iter) &&
+ !gtk_text_iter_equal (&end, &sr_end_iter)) {
+ /* ending point is inside, move the start mark */
+ gtk_text_buffer_move_mark (region->buffer, sr->start, &end);
+ } else {
+ end_is_outside = TRUE;
+ DEBUG (g_message ("end is outside"));
+
+ }
+
+ /* finally remove any intermediate subregions */
+ done = FALSE;
+ node = start_node;
+
+ while (!done) {
+ if (node == end_node)
+ /* we are done, exit in the next iteration */
+ done = TRUE;
+
+ if ((node == start_node && !start_is_outside) ||
+ (node == end_node && !end_is_outside)) {
+ /* skip starting or ending node */
+ node = node->next;
+ } else {
+ GList *l = node->next;
+ sr = node->data;
+ gtk_text_buffer_delete_mark (region->buffer, sr->start);
+ gtk_text_buffer_delete_mark (region->buffer, sr->end);
+ g_free (sr);
+ region->subregions = g_list_delete_link (region->subregions,
+ node);
+ node = l;
+ }
+ }
+
+ ++region->time_stamp;
+
+ DEBUG (gedit_text_region_debug_print (region));
+
+ /* now get rid of empty subregions */
+ gedit_text_region_clear_zero_length_subregions (region);
+
+ DEBUG (gedit_text_region_debug_print (region));
+}
+
+gint
+gedit_text_region_subregions (GeditTextRegion *region)
+{
+ g_return_val_if_fail (region != NULL, 0);
+
+ return g_list_length (region->subregions);
+}
+
+gboolean
+gedit_text_region_nth_subregion (GeditTextRegion *region,
+ guint subregion,
+ GtkTextIter *start,
+ GtkTextIter *end)
+{
+ Subregion *sr;
+
+ g_return_val_if_fail (region != NULL, FALSE);
+
+ sr = g_list_nth_data (region->subregions, subregion);
+ if (sr == NULL)
+ return FALSE;
+
+ if (start)
+ gtk_text_buffer_get_iter_at_mark (region->buffer, start, sr->start);
+ if (end)
+ gtk_text_buffer_get_iter_at_mark (region->buffer, end, sr->end);
+
+ return TRUE;
+}
+
+GeditTextRegion *
+gedit_text_region_intersect (GeditTextRegion *region,
+ const GtkTextIter *_start,
+ const GtkTextIter *_end)
+{
+ GList *start_node, *end_node, *node;
+ GtkTextIter sr_start_iter, sr_end_iter;
+ Subregion *sr, *new_sr;
+ gboolean done;
+ GeditTextRegion *new_region;
+ GtkTextIter start, end;
+
+ g_return_val_if_fail (region != NULL && _start != NULL && _end != NULL, NULL);
+
+ start = *_start;
+ end = *_end;
+
+ gtk_text_iter_order (&start, &end);
+
+ /* find bounding subregions */
+ start_node = find_nearest_subregion (region, &start, NULL, FALSE, FALSE);
+ end_node = find_nearest_subregion (region, &end, start_node, TRUE, FALSE);
+
+ /* easy case first */
+ if (start_node == NULL || end_node == NULL || end_node == start_node->prev)
+ return NULL;
+
+ new_region = gedit_text_region_new (region->buffer);
+ done = FALSE;
+
+ sr = start_node->data;
+ gtk_text_buffer_get_iter_at_mark (region->buffer, &sr_start_iter, sr->start);
+ gtk_text_buffer_get_iter_at_mark (region->buffer, &sr_end_iter, sr->end);
+
+ /* starting node */
+ if (gtk_text_iter_in_range (&start, &sr_start_iter, &sr_end_iter)) {
+ new_sr = g_new0 (Subregion, 1);
+ new_region->subregions = g_list_prepend (new_region->subregions, new_sr);
+
+ new_sr->start = gtk_text_buffer_create_mark (new_region->buffer, NULL,
+ &start, TRUE);
+ if (start_node == end_node) {
+ /* things will finish shortly */
+ done = TRUE;
+ if (gtk_text_iter_in_range (&end, &sr_start_iter, &sr_end_iter))
+ new_sr->end = gtk_text_buffer_create_mark (new_region->buffer,
+ NULL, &end, FALSE);
+ else
+ new_sr->end = gtk_text_buffer_create_mark (new_region->buffer,
+ NULL, &sr_end_iter,
+ FALSE);
+ } else {
+ new_sr->end = gtk_text_buffer_create_mark (new_region->buffer, NULL,
+ &sr_end_iter, FALSE);
+ }
+ node = start_node->next;
+ } else {
+ /* start should be the same as the subregion, so copy it in the loop */
+ node = start_node;
+ }
+
+ if (!done) {
+ while (node != end_node) {
+ /* copy intermediate subregions verbatim */
+ sr = node->data;
+ gtk_text_buffer_get_iter_at_mark (region->buffer, &sr_start_iter,
+ sr->start);
+ gtk_text_buffer_get_iter_at_mark (region->buffer, &sr_end_iter, sr->end);
+
+ new_sr = g_new0 (Subregion, 1);
+ new_region->subregions = g_list_prepend (new_region->subregions, new_sr);
+ new_sr->start = gtk_text_buffer_create_mark (new_region->buffer, NULL,
+ &sr_start_iter, TRUE);
+ new_sr->end = gtk_text_buffer_create_mark (new_region->buffer, NULL,
+ &sr_end_iter, FALSE);
+ /* next node */
+ node = node->next;
+ }
+
+ /* ending node */
+ sr = node->data;
+ gtk_text_buffer_get_iter_at_mark (region->buffer, &sr_start_iter, sr->start);
+ gtk_text_buffer_get_iter_at_mark (region->buffer, &sr_end_iter, sr->end);
+
+ new_sr = g_new0 (Subregion, 1);
+ new_region->subregions = g_list_prepend (new_region->subregions, new_sr);
+
+ new_sr->start = gtk_text_buffer_create_mark (new_region->buffer, NULL,
+ &sr_start_iter, TRUE);
+
+ if (gtk_text_iter_in_range (&end, &sr_start_iter, &sr_end_iter))
+ new_sr->end = gtk_text_buffer_create_mark (new_region->buffer, NULL,
+ &end, FALSE);
+ else
+ new_sr->end = gtk_text_buffer_create_mark (new_region->buffer, NULL,
+ &sr_end_iter, FALSE);
+ }
+
+ new_region->subregions = g_list_reverse (new_region->subregions);
+ return new_region;
+}
+
+static gboolean
+check_iterator (GeditTextRegionIteratorReal *real)
+{
+ if ((real->region == NULL) ||
+ (real->region_time_stamp != real->region->time_stamp))
+ {
+ g_warning("Invalid iterator: either the iterator "
+ "is uninitialized, or the region "
+ "has been modified since the iterator "
+ "was created.");
+
+ return FALSE;
+ }
+
+ return TRUE;
+}
+
+void
+gedit_text_region_get_iterator (GeditTextRegion *region,
+ GeditTextRegionIterator *iter,
+ guint start)
+{
+ GeditTextRegionIteratorReal *real;
+
+ g_return_if_fail (region != NULL);
+ g_return_if_fail (iter != NULL);
+
+ real = (GeditTextRegionIteratorReal *)iter;
+
+ /* region->subregions may be NULL, -> end iter */
+
+ real->region = region;
+ real->subregions = g_list_nth (region->subregions, start);
+ real->region_time_stamp = region->time_stamp;
+}
+
+gboolean
+gedit_text_region_iterator_is_end (GeditTextRegionIterator *iter)
+{
+ GeditTextRegionIteratorReal *real;
+
+ g_return_val_if_fail (iter != NULL, FALSE);
+
+ real = (GeditTextRegionIteratorReal *)iter;
+ g_return_val_if_fail (check_iterator (real), FALSE);
+
+ return (real->subregions == NULL);
+}
+
+gboolean
+gedit_text_region_iterator_next (GeditTextRegionIterator *iter)
+{
+ GeditTextRegionIteratorReal *real;
+
+ g_return_val_if_fail (iter != NULL, FALSE);
+
+ real = (GeditTextRegionIteratorReal *)iter;
+ g_return_val_if_fail (check_iterator (real), FALSE);
+
+ if (real->subregions != NULL) {
+ real->subregions = g_list_next (real->subregions);
+ return TRUE;
+ }
+ else
+ return FALSE;
+}
+
+void
+gedit_text_region_iterator_get_subregion (GeditTextRegionIterator *iter,
+ GtkTextIter *start,
+ GtkTextIter *end)
+{
+ GeditTextRegionIteratorReal *real;
+ Subregion *sr;
+
+ g_return_if_fail (iter != NULL);
+
+ real = (GeditTextRegionIteratorReal *)iter;
+ g_return_if_fail (check_iterator (real));
+ g_return_if_fail (real->subregions != NULL);
+
+ sr = (Subregion*)real->subregions->data;
+ g_return_if_fail (sr != NULL);
+
+ if (start)
+ gtk_text_buffer_get_iter_at_mark (real->region->buffer, start, sr->start);
+ if (end)
+ gtk_text_buffer_get_iter_at_mark (real->region->buffer, end, sr->end);
+}
+
+void
+gedit_text_region_debug_print (GeditTextRegion *region)
+{
+ GList *l;
+
+ g_return_if_fail (region != NULL);
+
+ g_print ("Subregions: ");
+ l = region->subregions;
+ while (l) {
+ Subregion *sr = l->data;
+ GtkTextIter iter1, iter2;
+ gtk_text_buffer_get_iter_at_mark (region->buffer, &iter1, sr->start);
+ gtk_text_buffer_get_iter_at_mark (region->buffer, &iter2, sr->end);
+ g_print ("%d-%d ", gtk_text_iter_get_offset (&iter1),
+ gtk_text_iter_get_offset (&iter2));
+ l = l->next;
+ }
+ g_print ("\n");
+}
+
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