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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) 0
-
- /* 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. */
- #define FRONT_STICKY_P(i) ((i)->front_sticky != 0)
- #define END_STICKY_P(i) ((i)->rear_sticky != 0)
-
-
- /* 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 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, Qread_only;
-
- 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 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 */
-