/* gtktextmark.c - mark segments * * Copyright (c) 1994 The Regents of the University of California. * Copyright (c) 1994-1997 Sun Microsystems, Inc. * Copyright (c) 2000 Red Hat, Inc. * Tk -> Gtk port by Havoc Pennington * * This software is copyrighted by the Regents of the University of * California, Sun Microsystems, Inc., and other parties. The * following terms apply to all files associated with the software * unless explicitly disclaimed in individual files. * * The authors hereby grant permission to use, copy, modify, * distribute, and license this software and its documentation for any * purpose, provided that existing copyright notices are retained in * all copies and that this notice is included verbatim in any * distributions. No written agreement, license, or royalty fee is * required for any of the authorized uses. Modifications to this * software may be copyrighted by their authors and need not follow * the licensing terms described here, provided that the new terms are * clearly indicated on the first page of each file where they apply. * * IN NO EVENT SHALL THE AUTHORS OR DISTRIBUTORS BE LIABLE TO ANY * PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL * DAMAGES ARISING OUT OF THE USE OF THIS SOFTWARE, ITS DOCUMENTATION, * OR ANY DERIVATIVES THEREOF, EVEN IF THE AUTHORS HAVE BEEN ADVISED * OF THE POSSIBILITY OF SUCH DAMAGE. * * THE AUTHORS AND DISTRIBUTORS SPECIFICALLY DISCLAIM ANY WARRANTIES, * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND * NON-INFRINGEMENT. THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, * AND THE AUTHORS AND DISTRIBUTORS HAVE NO OBLIGATION TO PROVIDE * MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. * * GOVERNMENT USE: If you are acquiring this software on behalf of the * U.S. government, the Government shall have only "Restricted Rights" * in the software and related documentation as defined in the Federal * Acquisition Regulations (FARs) in Clause 52.227.19 (c) (2). If you * are acquiring the software on behalf of the Department of Defense, * the software shall be classified as "Commercial Computer Software" * and the Government shall have only "Restricted Rights" as defined * in Clause 252.227-7013 (c) (1) of DFARs. Notwithstanding the * foregoing, the authors grant the U.S. Government and others acting * in its behalf permission to use and distribute the software in * accordance with the terms specified in this license. * */ #include "gtktextbtree.h" gboolean gtk_text_mark_is_visible(GtkTextMark *mark) { GtkTextLineSegment *seg; seg = (GtkTextLineSegment*)mark; return seg->body.mark.visible; } const char * gtk_text_mark_get_name (GtkTextMark *mark) { GtkTextLineSegment *seg; seg = (GtkTextLineSegment*)mark; return seg->body.mark.name; } GtkTextMark * gtk_text_mark_ref (GtkTextMark *mark) { GtkTextLineSegment *seg; seg = (GtkTextLineSegment*)mark; _mark_segment_ref (seg); return mark; } void gtk_text_mark_unref (GtkTextMark *mark) { GtkTextLineSegment *seg; seg = (GtkTextLineSegment*)mark; _mark_segment_unref (seg); } gboolean gtk_text_mark_get_deleted (GtkTextMark *mark) { GtkTextLineSegment *seg; g_return_val_if_fail (mark != NULL, FALSE); seg = (GtkTextLineSegment*)mark; return seg->body.mark.tree == NULL; } /* * Macro that determines the size of a mark segment: */ #define MSEG_SIZE ((unsigned) (G_STRUCT_OFFSET(GtkTextLineSegment, body) \ + sizeof(GtkTextMarkBody))) GtkTextLineSegment* _mark_segment_new (GtkTextBTree *tree, gboolean left_gravity, const gchar *name) { GtkTextLineSegment *mark; mark = (GtkTextLineSegment *) g_malloc0 (MSEG_SIZE); mark->body.mark.name = g_strdup (name); if (left_gravity) mark->type = >k_text_left_mark_type; else mark->type = >k_text_right_mark_type; mark->byte_count = 0; mark->char_count = 0; mark->body.mark.tree = tree; mark->body.mark.line = NULL; mark->next = NULL; mark->body.mark.refcount = 1; mark->body.mark.visible = FALSE; mark->body.mark.not_deleteable = FALSE; return mark; } void _mark_segment_ref (GtkTextLineSegment *mark) { g_return_if_fail (mark != NULL); g_return_if_fail (mark->type == >k_text_right_mark_type || mark->type == >k_text_left_mark_type); g_return_if_fail (mark->body.mark.refcount > 0); mark->body.mark.refcount += 1; } void _mark_segment_unref (GtkTextLineSegment *mark) { g_return_if_fail (mark != NULL); g_return_if_fail (mark->type == >k_text_right_mark_type || mark->type == >k_text_left_mark_type); g_return_if_fail (mark->body.mark.refcount > 0); mark->body.mark.refcount -= 1; if (mark->body.mark.refcount == 0) { g_free(mark->body.mark.name); g_free(mark); } } static int mark_segment_delete_func (GtkTextLineSegment *segPtr, GtkTextLine *line, int treeGone); static GtkTextLineSegment *mark_segment_cleanup_func (GtkTextLineSegment *segPtr, GtkTextLine *line); static void mark_segment_check_func (GtkTextLineSegment *segPtr, GtkTextLine *line); /* * The following structures declare the "mark" segment types. * There are actually two types for marks, one with left gravity * and one with right gravity. They are identical except for * their gravity property. */ GtkTextLineSegmentClass gtk_text_right_mark_type = { "mark", /* name */ FALSE, /* leftGravity */ NULL, /* splitFunc */ mark_segment_delete_func, /* deleteFunc */ mark_segment_cleanup_func, /* cleanupFunc */ NULL, /* lineChangeFunc */ mark_segment_check_func /* checkFunc */ }; GtkTextLineSegmentClass gtk_text_left_mark_type = { "mark", /* name */ TRUE, /* leftGravity */ NULL, /* splitFunc */ mark_segment_delete_func, /* deleteFunc */ mark_segment_cleanup_func, /* cleanupFunc */ NULL, /* lineChangeFunc */ mark_segment_check_func /* checkFunc */ }; /* *-------------------------------------------------------------- * * mark_segment_delete_func -- * * This procedure is invoked by the text B-tree code whenever * a mark lies in a range of characters being deleted. * * Results: * Returns 1 to indicate that deletion has been rejected. * * Side effects: * None (even if the whole tree is being deleted we don't * free up the mark; it will be done elsewhere). * *-------------------------------------------------------------- */ static gboolean mark_segment_delete_func (GtkTextLineSegment *segPtr, GtkTextLine *line, gboolean tree_gone) { return TRUE; } /* *-------------------------------------------------------------- * * mark_segment_cleanup_func -- * * This procedure is invoked by the B-tree code whenever a * mark segment is moved from one line to another. * * Results: * None. * * Side effects: * The line field of the segment gets updated. * *-------------------------------------------------------------- */ static GtkTextLineSegment * mark_segment_cleanup_func(GtkTextLineSegment *seg, GtkTextLine *line) { /* not sure why Tk did this here and not in LineChangeFunc */ seg->body.mark.line = line; return seg; } /* *-------------------------------------------------------------- * * mark_segment_check_func -- * * This procedure is invoked by the B-tree code to perform * consistency checks on mark segments. * * Results: * None. * * Side effects: * The procedure panics if it detects anything wrong with * the mark. * *-------------------------------------------------------------- */ static void mark_segment_check_func(GtkTextLineSegment *seg, GtkTextLine *line) { if (seg->body.mark.line != line) g_error("mark_segment_check_func: seg->body.mark.line bogus"); }