code.delx.au - gnu-emacs/blob - src/intervals.h

   1 /* Definitions and global variables for intervals.
   2    Copyright (C) 1993, 1994, 2000, 2002, 2003 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 /* Abort if interval I's size is negative.  */
 129 #define CHECK_TOTAL_LENGTH(i) \
 130   if ((int) (i)->total_length < 0) abort (); else
 131
 132 /* Reset this interval to its vanilla, or no-property state. */
 133 #define RESET_INTERVAL(i) \
 134 { \
 135     (i)->total_length = (i)->position = 0;    \
 136     (i)->left = (i)->right = NULL_INTERVAL;   \
 137     SET_INTERVAL_PARENT (i, NULL_INTERVAL);   \
 138     (i)->write_protect = 0;                   \
 139     (i)->visible = 0;                         \
 140     (i)->front_sticky = (i)->rear_sticky = 0; \
 141     (i)->plist = Qnil;                        \
 142 }
 143
 144 /* Copy the cached property values of interval FROM to interval TO. */
 145 #define COPY_INTERVAL_CACHE(from,to) \
 146 { \
 147   (to)->write_protect = (from)->write_protect; \
 148   (to)->visible = (from)->visible;             \
 149   (to)->front_sticky = (from)->front_sticky;   \
 150   (to)->rear_sticky = (from)->rear_sticky;     \
 151 }
 152
 153 /* Copy only the set bits of FROM's cache. */
 154 #define MERGE_INTERVAL_CACHE(from,to) \
 155 { \
 156   if ((from)->write_protect) (to)->write_protect = 1; \
 157   if ((from)->visible) (to)->visible = 1;             \
 158   if ((from)->front_sticky) (to)->front_sticky = 1;   \
 159   if ((from)->rear_sticky) (to)->rear_sticky = 1;     \
 160 }
 161
 162 /* Macro determining whether the properties of an interval being
 163    inserted should be merged with the properties of the text where
 164    they are being inserted. */
 165 #define MERGE_INSERTIONS(i) 1
 166
 167 /* Macro determining if an invisible interval should be displayed
 168    as a special glyph, or not at all. */
 169 #define DISPLAY_INVISIBLE_GLYPH(i) 0
 170
 171 /* Is this interval visible?  Replace later with cache access */
 172 #define INTERVAL_VISIBLE_P(i) \
 173   (! NULL_INTERVAL_P (i) && NILP (textget ((i)->plist, Qinvisible)))
 174
 175 /* Is this interval writable?  Replace later with cache access */
 176 #define INTERVAL_WRITABLE_P(i)                                  \
 177   (! NULL_INTERVAL_P (i)                                        \
 178    && (NILP (textget ((i)->plist, Qread_only))                  \
 179        || ((CONSP (Vinhibit_read_only)                          \
 180             ? !NILP (Fmemq (textget ((i)->plist, Qread_only),   \
 181                             Vinhibit_read_only))                \
 182             : !NILP (Vinhibit_read_only)))))                    \
 183
 184 /* Macros to tell whether insertions before or after this interval
 185    should stick to it. */
 186 /* Replace later with cache access */
 187 /*#define FRONT_STICKY_P(i) ((i)->front_sticky != 0)
 188   #define END_STICKY_P(i) ((i)->rear_sticky != 0)*/
 189 /* As we now have Vtext_property_default_nonsticky, these macros are
 190    unreliable now.  Currently, they are never used.  */
 191 #define FRONT_STICKY_P(i) \
 192   (! NULL_INTERVAL_P (i) && ! NILP (textget ((i)->plist, Qfront_sticky)))
 193 #define END_NONSTICKY_P(i) \
 194   (! NULL_INTERVAL_P (i) && ! NILP (textget ((i)->plist, Qrear_nonsticky)))
 195 #define FRONT_NONSTICKY_P(i) \
 196   (! NULL_INTERVAL_P (i) && ! EQ (Qt, textget ((i)->plist, Qfront_sticky)))
 197
 198
 199 /* If PROP is the `invisible' property of a character,
 200    this is 1 if the character should be treated as invisible,
 201    and 2 if it is invisible but with an ellipsis.  */
 202
 203 #define TEXT_PROP_MEANS_INVISIBLE(prop)                         \
 204   (EQ (current_buffer->invisibility_spec, Qt)                   \
 205    ? !NILP (prop)                                               \
 206    : invisible_p (prop, current_buffer->invisibility_spec))
 207
 208 /* Declared in alloc.c */
 209
 210 extern INTERVAL make_interval P_ ((void));
 211
 212 /* Declared in intervals.c */
 213
 214 extern INTERVAL create_root_interval P_ ((Lisp_Object));
 215 extern void copy_properties P_ ((INTERVAL, INTERVAL));
 216 extern int intervals_equal P_ ((INTERVAL, INTERVAL));
 217 extern void traverse_intervals P_ ((INTERVAL, int,
 218                                     void (*) (INTERVAL, Lisp_Object),
 219                                     Lisp_Object));
 220 extern void traverse_intervals_noorder P_ ((INTERVAL,
 221                                     void (*) (INTERVAL, Lisp_Object),
 222                                     Lisp_Object));
 223 extern INTERVAL split_interval_right P_ ((INTERVAL, int));
 224 extern INTERVAL split_interval_left P_ ((INTERVAL, int));
 225 extern INTERVAL find_interval P_ ((INTERVAL, int));
 226 extern INTERVAL next_interval P_ ((INTERVAL));
 227 extern INTERVAL previous_interval P_ ((INTERVAL));
 228 extern INTERVAL merge_interval_left P_ ((INTERVAL));
 229 extern INTERVAL merge_interval_right P_ ((INTERVAL));
 230 extern void delete_interval P_ ((INTERVAL));
 231 extern INLINE void offset_intervals P_ ((struct buffer *, int, int));
 232 extern void graft_intervals_into_buffer P_ ((INTERVAL, int, int,
 233                                              struct buffer *, int));
 234 extern void set_point P_ ((struct buffer *, int));
 235 extern INLINE void temp_set_point P_ ((struct buffer *, int));
 236 extern void set_point_both P_ ((struct buffer *, int, int));
 237 extern INLINE void temp_set_point_both P_ ((struct buffer *, int, int));
 238 extern void verify_interval_modification P_ ((struct buffer *, int, int));
 239 extern INTERVAL balance_intervals P_ ((INTERVAL));
 240 extern INLINE void copy_intervals_to_string P_ ((Lisp_Object, struct buffer *,
 241                                                  int, int));
 242 extern INTERVAL copy_intervals P_ ((INTERVAL, int, int));
 243 extern Lisp_Object textget P_ ((Lisp_Object, Lisp_Object));
 244 extern Lisp_Object lookup_char_property P_ ((Lisp_Object, Lisp_Object, int));
 245 extern void move_if_not_intangible P_ ((int));
 246 extern int get_property_and_range P_ ((int, Lisp_Object, Lisp_Object *,
 247                                        int *, int *, Lisp_Object));
 248 extern Lisp_Object get_local_map P_ ((int, struct buffer *, Lisp_Object));
 249 extern INTERVAL update_interval P_ ((INTERVAL, int));
 250 extern void set_intervals_multibyte P_ ((int));
 251 extern INTERVAL validate_interval_range P_ ((Lisp_Object, Lisp_Object *,
 252                                              Lisp_Object *, int));
 253
 254 /* Defined in xdisp.c */
 255 extern int invisible_p P_ ((Lisp_Object, Lisp_Object));
 256
 257 /* Declared in textprop.c */
 258
 259 /* Types of hooks. */
 260 extern Lisp_Object Qmouse_left;
 261 extern Lisp_Object Qmouse_entered;
 262 extern Lisp_Object Qpoint_left;
 263 extern Lisp_Object Qpoint_entered;
 264 extern Lisp_Object Qmodification_hooks;
 265 extern Lisp_Object Qcategory;
 266 extern Lisp_Object Qlocal_map;
 267 extern Lisp_Object Qkeymap;
 268
 269 /* Visual properties text (including strings) may have. */
 270 extern Lisp_Object Qforeground, Qbackground, Qfont, Qunderline, Qstipple;
 271 extern Lisp_Object Qinvisible, Qintangible, Qread_only;
 272
 273 extern Lisp_Object Vinhibit_point_motion_hooks;
 274 extern Lisp_Object Vdefault_text_properties;
 275 extern Lisp_Object Vchar_property_alias_alist;
 276 extern Lisp_Object Vtext_property_default_nonsticky;
 277
 278 /* Sticky properties */
 279 extern Lisp_Object Qfront_sticky, Qrear_nonsticky;
 280
 281 EXFUN (Fget_char_property, 3);
 282 EXFUN (Fget_text_property, 3);
 283 EXFUN (Ftext_properties_at, 2);
 284 EXFUN (Fnext_property_change, 3);
 285 EXFUN (Fprevious_property_change, 3);
 286 EXFUN (Fadd_text_properties, 4);
 287 EXFUN (Fset_text_properties, 4);
 288 EXFUN (Fremove_text_properties, 4);
 289 EXFUN (Ftext_property_any, 5);
 290 EXFUN (Ftext_property_not_all, 5);
 291 EXFUN (Fprevious_single_char_property_change, 4);
 292 extern Lisp_Object copy_text_properties P_ ((Lisp_Object, Lisp_Object,
 293                                              Lisp_Object, Lisp_Object,
 294                                              Lisp_Object, Lisp_Object));
 295 extern Lisp_Object set_text_properties P_ ((Lisp_Object, Lisp_Object,
 296                                             Lisp_Object, Lisp_Object,
 297                                             Lisp_Object));
 298 extern void set_text_properties_1 P_ ((Lisp_Object, Lisp_Object,
 299                                        Lisp_Object, Lisp_Object, INTERVAL));
 300
 301 Lisp_Object text_property_list P_ ((Lisp_Object, Lisp_Object, Lisp_Object,
 302                                     Lisp_Object));
 303 int add_text_properties_from_list P_ ((Lisp_Object, Lisp_Object, Lisp_Object));
 304 void extend_property_ranges P_ ((Lisp_Object, Lisp_Object, Lisp_Object));
 305 Lisp_Object get_char_property_and_overlay P_ ((Lisp_Object, Lisp_Object,
 306                                                Lisp_Object, Lisp_Object*));
 307 extern int text_property_stickiness P_ ((Lisp_Object prop, Lisp_Object pos, Lisp_Object buffer));
 308 extern Lisp_Object get_pos_property P_ ((Lisp_Object pos, Lisp_Object prop, Lisp_Object object));
 309
 310 extern void syms_of_textprop ();
 311
 312 #include "composite.h"