src/intervals.h

   1 /* Definitions and global variables for intervals.
   2    Copyright (C) 1993, 1994, 2000, 2002 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Emacs.
   5
   6 GNU Emacs is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Emacs is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Emacs; see the file COPYING.  If not, write to
  18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21 #include "dispextern.h"
  22
  23 #define NULL_INTERVAL ((INTERVAL)0)
  24 #define INTERVAL_DEFAULT NULL_INTERVAL
  25
  26 /* These are macros for dealing with the interval tree. */
  27
  28 /* Size of the structure used to represent an interval */
  29 #define INTERVAL_SIZE (sizeof (struct interval))
  30
  31 /* Size of a pointer to an interval structure */
  32 #define INTERVAL_PTR_SIZE (sizeof (struct interval *))
  33
  34 /* True if an interval pointer is null, or is a Lisp_Buffer or
  35    Lisp_String pointer (meaning it points to the owner of this
  36    interval tree). */
  37 #ifdef NO_UNION_TYPE
  38 #define INT_LISPLIKE(i) (BUFFERP ((Lisp_Object)(i)) \
  39                          || STRINGP ((Lisp_Object)(i)))
  40 #else
  41 #define INT_LISPLIKE(i) (BUFFERP ((Lisp_Object){(EMACS_INT)(i)}) \
  42                          || STRINGP ((Lisp_Object){(EMACS_INT)(i)}))
  43 #endif
  44 #define NULL_INTERVAL_P(i) (CHECK(!INT_LISPLIKE(i),"non-interval"),(i) == NULL_INTERVAL)
  45 /* old #define NULL_INTERVAL_P(i) ((i) == NULL_INTERVAL || INT_LISPLIKE (i)) */
  46
  47 /* True if this interval has no right child. */
  48 #define NULL_RIGHT_CHILD(i) ((i)->right == NULL_INTERVAL)
  49
  50 /* True if this interval has no left child. */
  51 #define NULL_LEFT_CHILD(i) ((i)->left == NULL_INTERVAL)
  52
  53 /* True if this interval has no parent. */
  54 #define NULL_PARENT(i) ((i)->up_obj || (i)->up.interval == 0)
  55
  56 /* True if this interval is the left child of some other interval. */
  57 #define AM_LEFT_CHILD(i) (! NULL_PARENT (i) \
  58                           && INTERVAL_PARENT (i)->left == (i))
  59
  60 /* True if this interval is the right child of some other interval. */
  61 #define AM_RIGHT_CHILD(i) (! NULL_PARENT (i) \
  62                            && INTERVAL_PARENT (i)->right == (i))
  63
  64 /* True if this interval has no children. */
  65 #define LEAF_INTERVAL_P(i) ((i)->left == NULL_INTERVAL \
  66                             && (i)->right == NULL_INTERVAL)
  67
  68 /* True if this interval has no parent and is therefore the root. */
  69 #define ROOT_INTERVAL_P(i) (NULL_PARENT (i))
  70
  71 /* True if this interval is the only interval in the interval tree. */
  72 #define ONLY_INTERVAL_P(i) (ROOT_INTERVAL_P ((i)) && LEAF_INTERVAL_P ((i)))
  73
  74 /* True if this interval has both left and right children. */
  75 #define BOTH_KIDS_P(i) ((i)->left != NULL_INTERVAL     \
  76                         && (i)->right != NULL_INTERVAL)
  77
  78 /* The total size of all text represented by this interval and all its
  79    children in the tree.   This is zero if the interval is null. */
  80 #define TOTAL_LENGTH(i) ((i) == NULL_INTERVAL ? 0 : (i)->total_length)
  81
  82 /* The size of text represented by this interval alone. */
  83 #define LENGTH(i) ((i) == NULL_INTERVAL ? 0 : (TOTAL_LENGTH ((i))          \
  84                                                - TOTAL_LENGTH ((i)->right) \
  85                                                - TOTAL_LENGTH ((i)->left)))
  86
  87 /* The position of the character just past the end of I.  Note that
  88    the position cache i->position must be valid for this to work. */
  89 #define INTERVAL_LAST_POS(i) ((i)->position + LENGTH ((i)))
  90
  91 /* The total size of the left subtree of this interval. */
  92 #define LEFT_TOTAL_LENGTH(i) ((i)->left ? (i)->left->total_length : 0)
  93
  94 /* The total size of the right subtree of this interval. */
  95 #define RIGHT_TOTAL_LENGTH(i) ((i)->right ? (i)->right->total_length : 0)
  96
  97
  98 /* These macros are for dealing with the interval properties. */
  99
 100 /* True if this is a default interval, which is the same as being null
 101    or having no properties. */
 102 #define DEFAULT_INTERVAL_P(i) (NULL_INTERVAL_P (i) || EQ ((i)->plist, Qnil))
 103
 104 /* Test what type of parent we have.  Three possibilities: another
 105    interval, a buffer or string object, or NULL_INTERVAL.  */
 106 #define INTERVAL_HAS_PARENT(i) ((i)->up_obj == 0 && (i)->up.interval != 0)
 107 #define INTERVAL_HAS_OBJECT(i) ((i)->up_obj)
 108
 109 /* Set/get parent of an interval.
 110
 111    The choice of macros is dependent on the type needed.  Don't add
 112    casts to get around this, it will break some development work in
 113    progress.  */
 114 #define SET_INTERVAL_PARENT(i,p) (eassert (!INT_LISPLIKE (p)),(i)->up_obj = 0, (i)->up.interval = (p))
 115 #define SET_INTERVAL_OBJECT(i,o) (eassert (!INTEGERP (o)), eassert (BUFFERP (o) || STRINGP (o)),(i)->up_obj = 1, (i)->up.obj = (o))
 116 #define INTERVAL_PARENT(i) (eassert((i) != 0 && (i)->up_obj == 0),(i)->up.interval)
 117 #define GET_INTERVAL_OBJECT(d,s) (eassert((s)->up_obj == 1), (d) = (s)->up.obj)
 118
 119 /* Make the parent of D be whatever the parent of S is, regardless of
 120    type.  This is used when balancing an interval tree.  */
 121 #define COPY_INTERVAL_PARENT(d,s) ((d)->up = (s)->up, (d)->up_obj = (s)->up_obj)
 122
 123 /* Get the parent interval, if any, otherwise a null pointer.  Useful
 124    for walking up to the root in a "for" loop; use this to get the
 125    "next" value, and test the result to see if it's NULL_INTERVAL.  */
 126 #define INTERVAL_PARENT_OR_NULL(i) (INTERVAL_HAS_PARENT (i) ? INTERVAL_PARENT (i) : 0)
 127
 128 /* Reset this interval to its vanilla, or no-property state. */
 129 #define RESET_INTERVAL(i) \
 130 { \
 131     (i)->total_length = (i)->position = 0;    \
 132     (i)->left = (i)->right = NULL_INTERVAL;   \
 133     SET_INTERVAL_PARENT (i, NULL_INTERVAL);           \
 134     (i)->write_protect = 0;                   \
 135     (i)->visible = 0;                         \
 136     (i)->front_sticky = (i)->rear_sticky = 0; \
 137     (i)->plist = Qnil;                        \
 138 }
 139
 140 /* Copy the cached property values of interval FROM to interval TO. */
 141 #define COPY_INTERVAL_CACHE(from,to) \
 142 { \
 143   (to)->write_protect = (from)->write_protect; \
 144   (to)->visible = (from)->visible;             \
 145   (to)->front_sticky = (from)->front_sticky;   \
 146   (to)->rear_sticky = (from)->rear_sticky;     \
 147 }
 148
 149 /* Copy only the set bits of FROM's cache. */
 150 #define MERGE_INTERVAL_CACHE(from,to) \
 151 { \
 152   if ((from)->write_protect) (to)->write_protect = 1; \
 153   if ((from)->visible) (to)->visible = 1;             \
 154   if ((from)->front_sticky) (to)->front_sticky = 1;   \
 155   if ((from)->rear_sticky) (to)->rear_sticky = 1;     \
 156 }
 157
 158 /* Macro determining whether the properties of an interval being
 159    inserted should be merged with the properties of the text where
 160    they are being inserted. */
 161 #define MERGE_INSERTIONS(i) 1
 162
 163 /* Macro determining if an invisible interval should be displayed
 164    as a special glyph, or not at all. */
 165 #define DISPLAY_INVISIBLE_GLYPH(i) 0
 166
 167 /* Is this interval visible?  Replace later with cache access */
 168 #define INTERVAL_VISIBLE_P(i) \
 169   (! NULL_INTERVAL_P (i) && NILP (textget ((i)->plist, Qinvisible)))
 170
 171 /* Is this interval writable?  Replace later with cache access */
 172 #define INTERVAL_WRITABLE_P(i)                                  \
 173   (! NULL_INTERVAL_P (i)                                        \
 174    && (NILP (textget ((i)->plist, Qread_only))                  \
 175        || ((CONSP (Vinhibit_read_only)                          \
 176             ? !NILP (Fmemq (textget ((i)->plist, Qread_only),   \
 177                             Vinhibit_read_only))                \
 178             : !NILP (Vinhibit_read_only)))))                    \
 179
 180 /* Macros to tell whether insertions before or after this interval
 181    should stick to it. */
 182 /* Replace later with cache access */
 183 /*#define FRONT_STICKY_P(i) ((i)->front_sticky != 0)
 184   #define END_STICKY_P(i) ((i)->rear_sticky != 0)*/
 185 /* As we now have Vtext_property_default_nonsticky, these macros are
 186    unreliable now.  Currently, they are never used.  */
 187 #define FRONT_STICKY_P(i) \
 188   (! NULL_INTERVAL_P (i) && ! NILP (textget ((i)->plist, Qfront_sticky)))
 189 #define END_NONSTICKY_P(i) \
 190   (! NULL_INTERVAL_P (i) && ! NILP (textget ((i)->plist, Qrear_nonsticky)))
 191 #define FRONT_NONSTICKY_P(i) \
 192   (! NULL_INTERVAL_P (i) && ! EQ (Qt, textget ((i)->plist, Qfront_sticky)))
 193
 194
 195 /* If PROP is the `invisible' property of a character,
 196    this is 1 if the character should be treated as invisible,
 197    and 2 if it is invisible but with an ellipsis.  */
 198
 199 #define TEXT_PROP_MEANS_INVISIBLE(prop)                         \
 200   (EQ (current_buffer->invisibility_spec, Qt)                   \
 201    ? !NILP (prop)                                               \
 202    : invisible_p (prop, current_buffer->invisibility_spec))
 203
 204 /* Declared in alloc.c */
 205
 206 extern INTERVAL make_interval P_ ((void));
 207
 208 /* Declared in intervals.c */
 209
 210 extern INTERVAL create_root_interval P_ ((Lisp_Object));
 211 extern void copy_properties P_ ((INTERVAL, INTERVAL));
 212 extern int intervals_equal P_ ((INTERVAL, INTERVAL));
 213 extern void traverse_intervals P_ ((INTERVAL, int,
 214                                     void (*) (INTERVAL, Lisp_Object),
 215                                     Lisp_Object));
 216 extern void traverse_intervals_noorder P_ ((INTERVAL,
 217                                     void (*) (INTERVAL, Lisp_Object),
 218                                     Lisp_Object));
 219 extern INTERVAL split_interval_right P_ ((INTERVAL, int));
 220 extern INTERVAL split_interval_left P_ ((INTERVAL, int));
 221 extern INTERVAL find_interval P_ ((INTERVAL, int));
 222 extern INTERVAL next_interval P_ ((INTERVAL));
 223 extern INTERVAL previous_interval P_ ((INTERVAL));
 224 extern INTERVAL merge_interval_left P_ ((INTERVAL));
 225 extern INTERVAL merge_interval_right P_ ((INTERVAL));
 226 extern void delete_interval P_ ((INTERVAL));
 227 extern INLINE void offset_intervals P_ ((struct buffer *, int, int));
 228 extern void graft_intervals_into_buffer P_ ((INTERVAL, int, int,
 229                                              struct buffer *, int));
 230 extern void set_point P_ ((struct buffer *, int));
 231 extern INLINE void temp_set_point P_ ((struct buffer *, int));
 232 extern void set_point_both P_ ((struct buffer *, int, int));
 233 extern INLINE void temp_set_point_both P_ ((struct buffer *, int, int));
 234 extern void verify_interval_modification P_ ((struct buffer *, int, int));
 235 extern INTERVAL balance_intervals P_ ((INTERVAL));
 236 extern INLINE void copy_intervals_to_string P_ ((Lisp_Object, struct buffer *,
 237                                                  int, int));
 238 extern INTERVAL copy_intervals P_ ((INTERVAL, int, int));
 239 extern Lisp_Object textget P_ ((Lisp_Object, Lisp_Object));
 240 extern Lisp_Object lookup_char_property P_ ((Lisp_Object, Lisp_Object, int));
 241 extern void move_if_not_intangible P_ ((int));
 242 extern int get_property_and_range P_ ((int, Lisp_Object, Lisp_Object *,
 243                                        int *, int *, Lisp_Object));
 244 extern Lisp_Object get_local_map P_ ((int, struct buffer *, Lisp_Object));
 245 extern INTERVAL update_interval P_ ((INTERVAL, int));
 246 extern void set_intervals_multibyte P_ ((int));
 247 extern INTERVAL validate_interval_range P_ ((Lisp_Object, Lisp_Object *,
 248                                              Lisp_Object *, int));
 249
 250 /* Defined in xdisp.c */
 251 extern int invisible_p P_ ((Lisp_Object, Lisp_Object));
 252
 253 /* Declared in textprop.c */
 254
 255 /* Types of hooks. */
 256 extern Lisp_Object Qmouse_left;
 257 extern Lisp_Object Qmouse_entered;
 258 extern Lisp_Object Qpoint_left;
 259 extern Lisp_Object Qpoint_entered;
 260 extern Lisp_Object Qmodification_hooks;
 261 extern Lisp_Object Qcategory;
 262 extern Lisp_Object Qlocal_map;
 263 extern Lisp_Object Qkeymap;
 264
 265 /* Visual properties text (including strings) may have. */
 266 extern Lisp_Object Qforeground, Qbackground, Qfont, Qunderline, Qstipple;
 267 extern Lisp_Object Qinvisible, Qintangible, Qread_only;
 268
 269 extern Lisp_Object Vinhibit_point_motion_hooks;
 270 extern Lisp_Object Vdefault_text_properties;
 271 extern Lisp_Object Vchar_property_alias_alist;
 272 extern Lisp_Object Vtext_property_default_nonsticky;
 273
 274 /* Sticky properties */
 275 extern Lisp_Object Qfront_sticky, Qrear_nonsticky;
 276
 277 EXFUN (Fget_char_property, 3);
 278 EXFUN (Fget_text_property, 3);
 279 EXFUN (Ftext_properties_at, 2);
 280 EXFUN (Fnext_property_change, 3);
 281 EXFUN (Fprevious_property_change, 3);
 282 EXFUN (Fadd_text_properties, 4);
 283 EXFUN (Fset_text_properties, 4);
 284 EXFUN (Fremove_text_properties, 4);
 285 EXFUN (Ftext_property_any, 5);
 286 EXFUN (Ftext_property_not_all, 5);
 287 EXFUN (Fprevious_single_char_property_change, 4);
 288 extern Lisp_Object copy_text_properties P_ ((Lisp_Object, Lisp_Object,
 289                                              Lisp_Object, Lisp_Object,
 290                                              Lisp_Object, Lisp_Object));
 291 extern Lisp_Object set_text_properties P_ ((Lisp_Object, Lisp_Object,
 292                                             Lisp_Object, Lisp_Object,
 293                                             Lisp_Object));
 294 extern void set_text_properties_1 P_ ((Lisp_Object, Lisp_Object,
 295                                        Lisp_Object, Lisp_Object, INTERVAL));
 296
 297 Lisp_Object text_property_list P_ ((Lisp_Object, Lisp_Object, Lisp_Object,
 298                                     Lisp_Object));
 299 int add_text_properties_from_list P_ ((Lisp_Object, Lisp_Object, Lisp_Object));
 300 void extend_property_ranges P_ ((Lisp_Object, Lisp_Object, Lisp_Object));
 301 Lisp_Object get_char_property_and_overlay P_ ((Lisp_Object, Lisp_Object,
 302                                                Lisp_Object, Lisp_Object*));
 303 extern int text_property_stickiness P_ ((Lisp_Object prop, Lisp_Object pos));
 304
 305 extern void syms_of_textprop ();
 306
 307 #include "composite.h"