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+/* Definitions and global variables for intervals.
+   Copyright (C) 1990, 1992 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_INTERVALS
+#include "dispextern.h"
+
+#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 (Fmemq (Qinvisible, (i)->plist)))
+
+/* Is this interval writable?  Replace later with cache access */
+#define INTERVAL_WRITABLE_P(i) \
+  (! NULL_INTERVAL_P (i) && NILP (Fmemq (Qread_only, (i)->plist)))
+
+/* 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 INTERVAL mouse_interval;
+extern Lisp_Object Vmouse_buffer;
+extern int mouse_buffer_offset;
+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 INTERVAL find_interval (), next_interval (), previous_interval ();
+extern INTERVAL merge_interval_left (), merge_interval_right ();
+extern void delete_interval ();
+extern INLINE void offset_intervals ();
+extern void map_intervals ();
+extern void graft_intervals_into_buffer ();
+extern void set_point ();
+extern void verify_interval_modification ();
+extern INTERVAL balance_intervals ();
+extern void insert_interval_copy();
+extern void copy_intervals_to_string ();
+extern INTERVAL make_string_interval ();
+extern INTERVAL make_buffer_interval ();
+
+/* 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;
+
+/* Visual properties text (including strings) may have. */
+extern Lisp_Object Qforeground, Qbackground, Qfont, Qunderline, Qstipple;
+extern Lisp_Object Qinvisible, Qread_only;
+
+extern void run_hooks ();
+
+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 void syms_of_textprop ();
+
+#else  /* intervals not used */
+
+#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)
+
+#endif /* intervals not used */