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/* Definitions and global variables for intervals.
Copyright (C) 1993 Free Software Foundation, Inc.
This file is part of GNU Emacs.
GNU Emacs 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 1, or (at your option)
any later version.
GNU Emacs 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 GNU Emacs; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
#ifdef USE_TEXT_PROPERTIES
#ifndef NORMAL_FACE
#include "dispextern.h"
#endif
#define NULL_INTERVAL 0
#define INTERVAL_DEFAULT NULL_INTERVAL
/* These are macros for dealing with the interval tree. */
/* Size of the structure used to represent an interval */
#define INTERVAL_SIZE (sizeof (struct interval))
/* Size of a pointer to an interval structure */
#define INTERVAL_PTR_SIZE (sizeof (struct interval *))
/* True if an interval pointer is null, or is a Lisp_Buffer or
Lisp_String pointer (meaning it points to the owner of this
interval tree.) */
#define NULL_INTERVAL_P(i) ((i) == NULL_INTERVAL || \
XTYPE ((Lisp_Object)(i)) == Lisp_Buffer || \
XTYPE ((Lisp_Object)(i)) == Lisp_String)
/* True if this interval has no right child. */
#define NULL_RIGHT_CHILD(i) (NULL_INTERVAL_P((i)->right))
/* True if this interval has no left child. */
#define NULL_LEFT_CHILD(i) (NULL_INTERVAL_P((i)->left))
/* True if this interval has no parent. */
#define NULL_PARENT(i) (NULL_INTERVAL_P((i)->parent))
/* True if this interval is the left child of some other interval. */
#define AM_LEFT_CHILD(i) (! NULL_INTERVAL_P ((i)->parent) \
&& (i)->parent->left == (i))
/* True if this interval is the right ehild of some other interval. */
#define AM_RIGHT_CHILD(i) (! NULL_INTERVAL_P ((i)->parent) \
&& (i)->parent->right == (i))
/* True if this interval has no children. */
#define LEAF_INTERVAL_P(i) ((i)->left == NULL_INTERVAL \
&& (i)->right == NULL_INTERVAL)
/* True if this interval has no parent and is therefore the root. */
#define ROOT_INTERVAL_P(i) (NULL_PARENT (i))
/* True if this interval is the only interval in the interval tree. */
#define ONLY_INTERVAL_P(i) (ROOT_INTERVAL_P((i)) && LEAF_INTERVAL_P ((i)))
/* True if this interval has both left and right children. */
#define BOTH_KIDS_P(i) ((i)->left != NULL_INTERVAL \
&& (i)->right != NULL_INTERVAL)
/* The total size of all text represented by this interval and all its
children in the tree. This is zero if the interval is null. */
#define TOTAL_LENGTH(i) ((i) == NULL_INTERVAL ? 0 : (i)->total_length)
/* The size of text represented by this interval alone. */
#define LENGTH(i) ((i) == NULL_INTERVAL ? 0 : (TOTAL_LENGTH ((i)) \
- TOTAL_LENGTH ((i)->right) \
- TOTAL_LENGTH ((i)->left)))
/* The absolute index of the last character belonging to I. Note that
the position cache i->position must be valid for this to work. */
#define INTERVAL_LAST_POS(i) ((i)->position + LENGTH ((i)) - 1)
/* The total size of the left subtree of this interval. */
#define LEFT_TOTAL_LENGTH(i) ((i)->left ? (i)->left->total_length : 0)
/* The total size of the right subtree of this interval. */
#define RIGHT_TOTAL_LENGTH(i) ((i)->right ? (i)->right->total_length : 0)
/* These macros are for dealing with the interval properties. */
/* True if this is a default interval, which is the same as being null
or having no properties. */
#define DEFAULT_INTERVAL_P(i) (NULL_INTERVAL_P (i) || EQ ((i)->plist, Qnil))
/* Reset this interval to its vanilla, or no-property state. */
#define RESET_INTERVAL(i) { \
(i)->total_length = (i)->position = 0; \
(i)->left = (i)->right = NULL_INTERVAL; \
(i)->parent = NULL_INTERVAL; \
(i)->write_protect = 0; \
(i)->visible = 0; \
(i)->front_sticky = (i)->rear_sticky = 0; \
(i)->plist = Qnil; \
}
/* Copy the cached property values of interval FROM to interval TO. */
#define COPY_INTERVAL_CACHE(from,to) \
{ \
(to)->write_protect = (from)->write_protect; \
(to)->visible = (from)->visible; \
(to)->front_sticky = (from)->front_sticky; \
(to)->rear_sticky = (from)->rear_sticky; \
}
/* Copy only the set bits of FROM's cache. */
#define MERGE_INTERVAL_CACHE(from,to) \
{ \
if ((from)->write_protect) (to)->write_protect = 1; \
if ((from)->visible) (to)->visible = 1; \
if ((from)->front_sticky) (to)->front_sticky = 1; \
if ((from)->rear_sticky) (to)->rear_sticky = 1; \
}
/* Macro determining whether the properties of an interval being
inserted should be merged with the properties of the text where
they are being inserted. */
#define MERGE_INSERTIONS(i) 1
/* Macro determining if an invisible interval should be displayed
as a special glyph, or not at all. */
#define DISPLAY_INVISIBLE_GLYPH(i) 0
/* Is this interval visible? Replace later with cache access */
#define INTERVAL_VISIBLE_P(i) \
(! NULL_INTERVAL_P (i) && NILP (textget ((i)->plist, Qinvisible)))
/* Is this interval writable? Replace later with cache access */
#define INTERVAL_WRITABLE_P(i) \
(! NULL_INTERVAL_P (i) \
&& (NILP (textget ((i)->plist, Qread_only)) \
|| ((CONSP (Vinhibit_read_only) \
? !NILP (Fmemq (textget ((i)->plist, Qread_only), \
Vinhibit_read_only)) \
: !NILP (Vinhibit_read_only))))) \
/* Macros to tell whether insertions before or after this interval
should stick to it. */
/* Replace later with cache access */
/*#define FRONT_STICKY_P(i) ((i)->front_sticky != 0)
#define END_STICKY_P(i) ((i)->rear_sticky != 0)*/
#define FRONT_STICKY_P(i) \
(! NULL_INTERVAL_P (i) && ! NILP (textget ((i)->plist, Qfront_sticky)))
#define END_NONSTICKY_P(i) \
(! NULL_INTERVAL_P (i) && ! NILP (textget ((i)->plist, Qrear_nonsticky)))
/* Declared in alloc.c */
extern INTERVAL make_interval ();
/* Declared in intervals.c */
extern Lisp_Object interval_balance_threshold;
extern INTERVAL create_root_interval ();
extern void copy_properties ();
extern int intervals_equal ();
extern void traverse_intervals ();
extern INTERVAL split_interval_right (), split_interval_left ();
extern INLINE INTERVAL find_interval ();
extern INTERVAL next_interval (), previous_interval ();
extern INTERVAL merge_interval_left (), merge_interval_right ();
extern void delete_interval ();
extern INLINE void offset_intervals ();
extern void graft_intervals_into_buffer ();
extern void set_point ();
extern INLINE void temp_set_point ();
extern void verify_interval_modification ();
extern INTERVAL balance_intervals ();
extern INLINE void copy_intervals_to_string ();
extern INTERVAL copy_intervals ();
extern Lisp_Object textget ();
extern Lisp_Object textget_direct ();
extern Lisp_Object get_local_map ();
/* Declared in textprop.c */
/* Types of hooks. */
extern Lisp_Object Qmouse_left;
extern Lisp_Object Qmouse_entered;
extern Lisp_Object Qpoint_left;
extern Lisp_Object Qpoint_entered;
extern Lisp_Object Qmodification_hooks;
extern Lisp_Object Qcategory;
extern Lisp_Object Qlocal_map;
/* Visual properties text (including strings) may have. */
extern Lisp_Object Qforeground, Qbackground, Qfont, Qunderline, Qstipple;
extern Lisp_Object Qinvisible, Qhidden, Qread_only;
extern Lisp_Object Vinhibit_point_motion_hooks;
/* Sticky properties */
extern Lisp_Object Qfront_sticky, Qrear_nonsticky;
extern Lisp_Object Ftext_properties_at ();
extern Lisp_Object Fnext_property_change (), Fprevious_property_change ();
extern Lisp_Object Fadd_text_properties (), Fset_text_properties ();
extern Lisp_Object Fremove_text_properties (), Ferase_text_properties ();
extern Lisp_Object Ftext_property_any (), Ftext_property_not_all ();
extern Lisp_Object copy_text_properties ();
extern void syms_of_textprop ();
#else /* don't support text properties */
#define NULL_INTERVAL_P(i) 1
#define INTERVAL_SIZE 0
#define INTERVAL_PTR_SIZE 0
#define copy_intervals_to_string(string,buffer,position,length)
#define verify_interval_modification(buffer,start,end)
#define insert_interval_copy(source,position,end,sink,at)
#define graft_intervals_into_buffer(tree,position,bufferptr)
#define offset_intervals(buffer,position,length)
#define copy_intervals(tree,start,length)
#define syms_of_textprop()
#endif /* don't support text properties */
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