src/intervals.h

   1 /* Definitions and global variables for intervals.
   2    Copyright (C) 1993-1994, 2000-2012  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 3 of the License, or
   9 (at your option) 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.  If not, see <http://www.gnu.org/licenses/>.  */
  18
  19 #include "dispextern.h"
  20
  21 INLINE_HEADER_BEGIN
  22 #ifndef INTERVALS_INLINE
  23 # define INTERVALS_INLINE INLINE
  24 #endif
  25
  26 /* Basic data type for use of intervals.  */
  27
  28 struct interval
  29 {
  30   /* The first group of entries deal with the tree structure.  */
  31
  32   ptrdiff_t total_length;       /* Length of myself and both children.  */
  33   ptrdiff_t position;           /* Cache of interval's character position.  */
  34                                 /* This field is usually updated
  35                                    simultaneously with an interval
  36                                    traversal, there is no guarantee
  37                                    that it is valid for a random
  38                                    interval.  */
  39   struct interval *left;        /* Intervals which precede me.  */
  40   struct interval *right;       /* Intervals which succeed me.  */
  41
  42   /* Parent in the tree, or the Lisp_Object containing this interval tree.  */
  43   union
  44   {
  45     struct interval *interval;
  46     Lisp_Object obj;
  47   } up;
  48   unsigned int up_obj : 1;
  49
  50   unsigned gcmarkbit : 1;
  51
  52   /* The remaining components are `properties' of the interval.
  53      The first four are duplicates for things which can be on the list,
  54      for purposes of speed.  */
  55
  56   unsigned int write_protect : 1;   /* Non-zero means can't modify.  */
  57   unsigned int visible : 1;         /* Zero means don't display.  */
  58   unsigned int front_sticky : 1;    /* Non-zero means text inserted just
  59                                        before this interval goes into it.  */
  60   unsigned int rear_sticky : 1;     /* Likewise for just after it.  */
  61   Lisp_Object plist;                /* Other properties.  */
  62 };
  63
  64 /* These are macros for dealing with the interval tree.  */
  65
  66 /* True if this interval has no right child.  */
  67 #define NULL_RIGHT_CHILD(i) ((i)->right == NULL)
  68
  69 /* True if this interval has no left child.  */
  70 #define NULL_LEFT_CHILD(i) ((i)->left == NULL)
  71
  72 /* True if this interval has no parent.  */
  73 #define NULL_PARENT(i) ((i)->up_obj || (i)->up.interval == 0)
  74
  75 /* True if this interval is the left child of some other interval.  */
  76 #define AM_LEFT_CHILD(i)                                        \
  77   (! NULL_PARENT (i) && INTERVAL_PARENT (i)->left == (i))
  78
  79 /* True if this interval is the right child of some other interval.  */
  80 #define AM_RIGHT_CHILD(i)                                       \
  81   (! NULL_PARENT (i) && INTERVAL_PARENT (i)->right == (i))
  82
  83 /* True if this interval has no children.  */
  84 #define LEAF_INTERVAL_P(i) ((i)->left == NULL && (i)->right == NULL)
  85
  86 /* True if this interval has no parent and is therefore the root.  */
  87 #define ROOT_INTERVAL_P(i) (NULL_PARENT (i))
  88
  89 /* True if this interval is the only interval in the interval tree.  */
  90 #define ONLY_INTERVAL_P(i) (ROOT_INTERVAL_P ((i)) && LEAF_INTERVAL_P ((i)))
  91
  92 /* True if this interval has both left and right children.  */
  93 #define BOTH_KIDS_P(i) ((i)->left != NULL && (i)->right != NULL)
  94
  95 /* The total size of all text represented by this interval and all its
  96    children in the tree.   This is zero if the interval is null.  */
  97 #define TOTAL_LENGTH(i) ((i) == NULL ? 0 : (i)->total_length)
  98
  99 /* The size of text represented by this interval alone.  */
 100 #define LENGTH(i) ((i) == NULL ? 0 : (TOTAL_LENGTH ((i))                \
 101                                       - TOTAL_LENGTH ((i)->right)       \
 102                                       - TOTAL_LENGTH ((i)->left)))
 103
 104 /* The position of the character just past the end of I.  Note that
 105    the position cache i->position must be valid for this to work.  */
 106 #define INTERVAL_LAST_POS(i) ((i)->position + LENGTH ((i)))
 107
 108 /* The total size of the left subtree of this interval.  */
 109 #define LEFT_TOTAL_LENGTH(i) ((i)->left ? (i)->left->total_length : 0)
 110
 111 /* The total size of the right subtree of this interval.  */
 112 #define RIGHT_TOTAL_LENGTH(i) ((i)->right ? (i)->right->total_length : 0)
 113
 114 /* These macros are for dealing with the interval properties.  */
 115
 116 /* True if this is a default interval, which is the same as being null
 117    or having no properties.  */
 118 #define DEFAULT_INTERVAL_P(i) (!i || EQ ((i)->plist, Qnil))
 119
 120 /* Test what type of parent we have.  Three possibilities: another
 121    interval, a buffer or string object, or NULL.  */
 122 #define INTERVAL_HAS_PARENT(i) ((i)->up_obj == 0 && (i)->up.interval != 0)
 123 #define INTERVAL_HAS_OBJECT(i) ((i)->up_obj)
 124
 125 /* Use these macros to get parent of an interval.
 126
 127    The choice of macros is dependent on the type needed.  Don't add
 128    casts to get around this, it will break some development work in
 129    progress.  */
 130
 131 #define INTERVAL_PARENT(i)                                      \
 132    (eassert ((i) != 0 && (i)->up_obj == 0), (i)->up.interval)
 133
 134 #define GET_INTERVAL_OBJECT(d,s) (eassert ((s)->up_obj == 1), (d) = (s)->up.obj)
 135
 136 /* Use these functions to set Lisp_Object
 137    or pointer slots of struct interval.  */
 138
 139 INTERVALS_INLINE void
 140 set_interval_parent (INTERVAL i, INTERVAL parent)
 141 {
 142   i->up_obj = 0;
 143   i->up.interval = parent;
 144 }
 145
 146 INTERVALS_INLINE void
 147 set_interval_plist (INTERVAL i, Lisp_Object plist)
 148 {
 149   i->plist = plist;
 150 }
 151
 152 /* Get the parent interval, if any, otherwise a null pointer.  Useful
 153    for walking up to the root in a "for" loop; use this to get the
 154    "next" value, and test the result to see if it's NULL.  */
 155 #define INTERVAL_PARENT_OR_NULL(i) \
 156    (INTERVAL_HAS_PARENT (i) ? INTERVAL_PARENT (i) : 0)
 157
 158 /* Reset this interval to its vanilla, or no-property state.  */
 159 #define RESET_INTERVAL(i)                     \
 160 {                                             \
 161   (i)->total_length = (i)->position = 0;      \
 162   (i)->left = (i)->right = NULL;              \
 163   set_interval_parent (i, NULL);              \
 164   (i)->write_protect = 0;                     \
 165   (i)->visible = 0;                           \
 166   (i)->front_sticky = (i)->rear_sticky = 0;   \
 167   set_interval_plist (i, Qnil);               \
 168 }
 169
 170 /* Copy the cached property values of interval FROM to interval TO.  */
 171 #define COPY_INTERVAL_CACHE(from,to)            \
 172 {                                               \
 173   (to)->write_protect = (from)->write_protect;  \
 174   (to)->visible = (from)->visible;              \
 175   (to)->front_sticky = (from)->front_sticky;    \
 176   (to)->rear_sticky = (from)->rear_sticky;      \
 177 }
 178
 179 /* Copy only the set bits of FROM's cache.  */
 180 #define MERGE_INTERVAL_CACHE(from,to)                 \
 181 {                                                     \
 182   if ((from)->write_protect) (to)->write_protect = 1; \
 183   if ((from)->visible) (to)->visible = 1;             \
 184   if ((from)->front_sticky) (to)->front_sticky = 1;   \
 185   if ((from)->rear_sticky) (to)->rear_sticky = 1;     \
 186 }
 187
 188 /* Is this interval visible?  Replace later with cache access.  */
 189 #define INTERVAL_VISIBLE_P(i) \
 190   (i && NILP (textget ((i)->plist, Qinvisible)))
 191
 192 /* Is this interval writable?  Replace later with cache access.  */
 193 #define INTERVAL_WRITABLE_P(i)                                  \
 194   (i && (NILP (textget ((i)->plist, Qread_only))                \
 195          || ((CONSP (Vinhibit_read_only)                        \
 196               ? !NILP (Fmemq (textget ((i)->plist, Qread_only), \
 197                               Vinhibit_read_only))              \
 198               : !NILP (Vinhibit_read_only)))))                  \
 199
 200 /* Macros to tell whether insertions before or after this interval
 201    should stick to it.  Now we have Vtext_property_default_nonsticky,
 202    so these macros are unreliable now and never used.  */
 203
 204 #if 0
 205 #define FRONT_STICKY_P(i)                               \
 206   (i && ! NILP (textget ((i)->plist, Qfront_sticky)))
 207 #define END_NONSTICKY_P(i)                              \
 208   (i && ! NILP (textget ((i)->plist, Qrear_nonsticky)))
 209 #define FRONT_NONSTICKY_P(i)                            \
 210   (i && ! EQ (Qt, textget ((i)->plist, Qfront_sticky)))
 211 #endif
 212
 213 /* If PROP is the `invisible' property of a character,
 214    this is 1 if the character should be treated as invisible,
 215    and 2 if it is invisible but with an ellipsis.  */
 216
 217 #define TEXT_PROP_MEANS_INVISIBLE(prop)                                 \
 218   (EQ (BVAR (current_buffer, invisibility_spec), Qt)                    \
 219    ? !NILP (prop)                                                       \
 220    : invisible_p (prop, BVAR (current_buffer, invisibility_spec)))
 221
 222 /* Declared in alloc.c.  */
 223
 224 extern INTERVAL make_interval (void);
 225
 226 /* Declared in intervals.c.  */
 227
 228 extern INTERVAL create_root_interval (Lisp_Object);
 229 extern void copy_properties (INTERVAL, INTERVAL);
 230 extern bool intervals_equal (INTERVAL, INTERVAL);
 231 extern void traverse_intervals (INTERVAL, ptrdiff_t,
 232                                 void (*) (INTERVAL, Lisp_Object),
 233                                 Lisp_Object);
 234 extern void traverse_intervals_noorder (INTERVAL,
 235                                         void (*) (INTERVAL, Lisp_Object),
 236                                         Lisp_Object);
 237 extern INTERVAL split_interval_right (INTERVAL, ptrdiff_t);
 238 extern INTERVAL split_interval_left (INTERVAL, ptrdiff_t);
 239 extern INTERVAL find_interval (INTERVAL, ptrdiff_t);
 240 extern INTERVAL next_interval (INTERVAL);
 241 extern INTERVAL previous_interval (INTERVAL);
 242 extern INTERVAL merge_interval_left (INTERVAL);
 243 extern void offset_intervals (struct buffer *, ptrdiff_t, ptrdiff_t);
 244 extern void graft_intervals_into_buffer (INTERVAL, ptrdiff_t, ptrdiff_t,
 245                                          struct buffer *, bool);
 246 extern void verify_interval_modification (struct buffer *,
 247                                           ptrdiff_t, ptrdiff_t);
 248 extern INTERVAL balance_intervals (INTERVAL);
 249 extern void copy_intervals_to_string (Lisp_Object, struct buffer *,
 250                                              ptrdiff_t, ptrdiff_t);
 251 extern INTERVAL copy_intervals (INTERVAL, ptrdiff_t, ptrdiff_t);
 252 extern bool compare_string_intervals (Lisp_Object, Lisp_Object);
 253 extern Lisp_Object textget (Lisp_Object, Lisp_Object);
 254 extern Lisp_Object lookup_char_property (Lisp_Object, Lisp_Object, bool);
 255 extern void move_if_not_intangible (ptrdiff_t);
 256 extern bool get_property_and_range (ptrdiff_t, Lisp_Object, Lisp_Object *,
 257                                     ptrdiff_t *, ptrdiff_t *, Lisp_Object);
 258 extern Lisp_Object get_local_map (ptrdiff_t, struct buffer *, Lisp_Object);
 259 extern INTERVAL update_interval (INTERVAL, ptrdiff_t);
 260 extern void set_intervals_multibyte (bool);
 261 extern INTERVAL validate_interval_range (Lisp_Object, Lisp_Object *,
 262                                          Lisp_Object *, int);
 263 extern INTERVAL interval_of (ptrdiff_t, Lisp_Object);
 264
 265 /* Defined in xdisp.c.  */
 266 extern int invisible_p (Lisp_Object, Lisp_Object);
 267
 268 /* Declared in textprop.c.  */
 269
 270 /* Types of hooks.  */
 271 extern Lisp_Object Qpoint_left;
 272 extern Lisp_Object Qpoint_entered;
 273 extern Lisp_Object Qmodification_hooks;
 274 extern Lisp_Object Qcategory;
 275 extern Lisp_Object Qlocal_map;
 276 extern Lisp_Object Qkeymap;
 277
 278 /* Visual properties text (including strings) may have.  */
 279 extern Lisp_Object Qfont;
 280 extern Lisp_Object Qinvisible, Qintangible;
 281
 282 /* Sticky properties.  */
 283 extern Lisp_Object Qfront_sticky, Qrear_nonsticky;
 284
 285 extern Lisp_Object copy_text_properties (Lisp_Object, Lisp_Object,
 286                                          Lisp_Object, Lisp_Object,
 287                                          Lisp_Object, Lisp_Object);
 288 extern Lisp_Object set_text_properties (Lisp_Object, Lisp_Object,
 289                                         Lisp_Object, Lisp_Object,
 290                                         Lisp_Object);
 291 extern void set_text_properties_1 (Lisp_Object, Lisp_Object,
 292                                    Lisp_Object, Lisp_Object, INTERVAL);
 293
 294 Lisp_Object text_property_list (Lisp_Object, Lisp_Object, Lisp_Object,
 295                                 Lisp_Object);
 296 int add_text_properties_from_list (Lisp_Object, Lisp_Object, Lisp_Object);
 297 Lisp_Object extend_property_ranges (Lisp_Object, Lisp_Object);
 298 Lisp_Object get_char_property_and_overlay (Lisp_Object, Lisp_Object,
 299                                            Lisp_Object, Lisp_Object*);
 300 extern int text_property_stickiness (Lisp_Object prop, Lisp_Object pos,
 301                                      Lisp_Object buffer);
 302 extern Lisp_Object get_pos_property (Lisp_Object pos, Lisp_Object prop,
 303                                      Lisp_Object object);
 304
 305 extern void syms_of_textprop (void);
 306
 307 #include "composite.h"
 308
 309 INLINE_HEADER_END