1 /* Copyright (c) 1994, 1995 Free Software Foundation.
2 Copyright (c) 1995 Ben Wing.
4 This file is part of XEmacs.
6 XEmacs is free software; you can redistribute it and/or modify it
7 under the terms of the GNU General Public License as published by the
8 Free Software Foundation; either version 2, or (at your option) any
11 XEmacs is distributed in the hope that it will be useful, but WITHOUT
12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with XEmacs; 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. */
21 /* Synched up with: Not in FSF. */
23 #ifndef INCLUDED_extents_h_
24 #define INCLUDED_extents_h_
26 DECLARE_LRECORD (extent, struct extent);
27 #define XEXTENT(x) XRECORD (x, extent, struct extent)
28 #define XSETEXTENT(x, p) XSETRECORD (x, p, extent)
29 #define EXTENTP(x) RECORDP (x, extent)
30 #define CHECK_EXTENT(x) CHECK_RECORD (x, extent)
31 #define CONCHECK_EXTENT(x) CONCHECK_RECORD (x, extent)
33 /* the layouts for glyphs (extent->flags.glyph_layout). Must fit in 2 bits. */
34 typedef enum glyph_layout
44 struct lrecord_header lheader;
48 Lisp_Object object; /* A buffer, string, Qnil (extent detached from no
49 buffer), Qt (destroyed extent) */
51 /* Extent properties are conceptually a plist, but the most common
52 props are implemented as bits instead of conses. */
57 /* These flags are simply an optimization for common boolean properties
58 which go onto the extent's property list. Any of them would work if
59 done in the normal way, but the space savings of doing these in this
60 way is significant. Note that if you add a flag, there are numerous
61 places in extents.c that need to know about it.
63 Another consideration is that some of these properties are accessed
64 during redisplay, so it's good for access to them to be fast (a bit
65 reference instead of a search down a plist).
67 `begin_glyph_layout' and `end_glyph_layout' are unusual in that
68 they have 4 states instead of 2.
70 Other special extent properties are stored in an auxiliary
71 structure that sits at the beginning of the plist. The has_aux
72 flag indicates whether this structure exists. The has_parent
73 flag is an optimization indicating whether the extent has a parent
74 (this could also be determined by looking in the aux structure). */
76 enum_field (glyph_layout) begin_glyph_layout :2;
77 /* 2 text, margins, or whitespace */
78 enum_field (glyph_layout) end_glyph_layout :2;
79 /* 4 text, margins, or whitespace */
80 unsigned int has_parent :1; /* 5 extent has a parent */
81 unsigned int has_aux :1; /* 6 extent has an aux. structure */
82 unsigned int start_open :1; /* 7 insertion behavior at start */
83 unsigned int end_open :1; /* 8 insertion behavior at end */
84 unsigned int unique :1; /* 9 there may be only one attached */
85 unsigned int duplicable :1; /* 10 copied to strings by kill/undo */
86 unsigned int detachable :1; /* 11 extent detaches if text deleted */
87 unsigned int internal :1; /* 12 used by map-extents etc. */
88 unsigned int in_red_event :1; /* 13 An event has been spawned for
90 (not exported to lisp) */
91 unsigned int unused16 :1; /* 16 unused bits */
92 /* --- Adding more flags will cause the extent struct to grow by another
93 word. It's not clear that this would make a difference, however,
94 because on 32-bit machines things tend to get allocated in chunks
97 /* The plist may have an auxiliary structure as its first element */
101 /* Basic properties of an extent (not affected by the extent's parent) */
102 #define extent_object(e) ((e)->object)
103 #define extent_start(e) ((e)->start + 0)
104 #define extent_end(e) ((e)->end + 0)
105 #define set_extent_start(e, val) ((void) ((e)->start = (val)))
106 #define set_extent_end(e, val) ((void) ((e)->end = (val)))
107 #define extent_endpoint(e, endp) ((endp) ? extent_end (e) : extent_start (e))
108 #define set_extent_endpoint(e, val, endp) \
109 ((endp) ? set_extent_end (e, val) : set_extent_start (e, val))
110 #define extent_detached_p(e) (extent_start (e) < 0)
112 /* Additional information that may be present in an extent. The idea is
113 that fast access is provided to this information, but since (hopefully)
114 most extents won't have this set on them, we usually don't need to
115 have this structure around and thus the size of an extent is smaller. */
117 typedef struct extent_auxiliary extent_auxiliary;
118 struct extent_auxiliary
120 struct lcrecord_header header;
122 Lisp_Object begin_glyph;
123 Lisp_Object end_glyph;
125 /* We use a weak list here. Originally I didn't do this and
126 depended on having the extent's finalization method remove
127 itself from its parent's children list. This runs into
128 lots and lots of problems though because everything is in
129 a really really bizarre state when an extent's finalization
130 method is called (it happens in sweep_extents() by way of
131 ADDITIONAL_FREE_extent()) and it's extremely difficult to
132 avoid getting hosed by just-freed objects. */
133 Lisp_Object children;
134 Lisp_Object invisible;
135 Lisp_Object read_only;
136 Lisp_Object mouse_face;
137 Lisp_Object initial_redisplay_function;
138 Lisp_Object before_change_functions, after_change_functions;
142 extern struct extent_auxiliary extent_auxiliary_defaults;
144 DECLARE_LRECORD (extent_auxiliary, struct extent_auxiliary);
145 #define XEXTENT_AUXILIARY(x) \
146 XRECORD (x, extent_auxiliary, struct extent_auxiliary)
147 #define XSETEXTENT_AUXILIARY(x, p) XSETRECORD (x, p, extent_auxiliary)
148 #define EXTENT_AUXILIARYP(x) RECORDP (x, extent_auxiliary)
149 #define CHECK_EXTENT_AUXILIARY(x) CHECK_RECORD (x, extent_auxiliary)
150 #define CONCHECK_EXTENT_AUXILIARY(x) CONCHECK_RECORD (x, extent_auxiliary)
154 struct lcrecord_header header;
156 struct extent_list *extents;
157 struct stack_of_extents *soe;
160 DECLARE_LRECORD (extent_info, struct extent_info);
161 #define XEXTENT_INFO(x) XRECORD (x, extent_info, struct extent_info)
162 #define XSETEXTENT_INFO(x, p) XSETRECORD (x, p, extent_info)
163 #define EXTENT_INFOP(x) RECORDP (x, extent_info)
164 #define CHECK_EXTENT_INFO(x) CHECK_RECORD (x, extent_info)
165 #define CONCHECK_EXTENT_INFO(x) CONCHECK_RECORD (x, extent_info)
167 void flush_cached_extent_info (Lisp_Object extent_info);
169 /* A "normal" field is one that is stored in the `struct flags' structure
170 in an extent. an "aux" field is one that is stored in the extent's
173 The functions below that have `extent_no_chase' in their name operate
174 on an extent directly (ignoring its parent), and should normally
175 only be used on extents known not to have a parent. The other
176 versions chase down any parent links. */
178 #define extent_no_chase_normal_field(e, field) ((e)->flags.field)
180 INLINE_HEADER struct extent_auxiliary *extent_aux_or_default (EXTENT e);
181 INLINE_HEADER struct extent_auxiliary *
182 extent_aux_or_default (EXTENT e)
184 return e->flags.has_aux ?
185 XEXTENT_AUXILIARY (XCAR (e->plist)) :
186 & extent_auxiliary_defaults;
189 #define extent_no_chase_aux_field(e, field) (extent_aux_or_default(e)->field)
191 #define extent_normal_field(e, field) \
192 extent_no_chase_normal_field (extent_ancestor (e), field)
194 #define extent_aux_field(e, field) \
195 extent_no_chase_aux_field (extent_ancestor (e), field)
197 #define set_extent_no_chase_aux_field(e, field, value) do { \
198 EXTENT sencaf_e = (e); \
199 if (! sencaf_e->flags.has_aux) \
200 allocate_extent_auxiliary (sencaf_e); \
201 XEXTENT_AUXILIARY (XCAR (sencaf_e->plist))->field = (value);\
204 #define set_extent_no_chase_normal_field(e, field, value) \
205 extent_no_chase_normal_field (e, field) = (value)
207 #define set_extent_aux_field(e, field, value) \
208 set_extent_no_chase_aux_field (extent_ancestor (e), field, value)
210 #define set_extent_normal_field(e, field, value) \
211 set_extent_ancestor_normal_field (extent_no_chase (e), field, value)
213 /* The `parent' and `children' fields are not affected by any
214 parent links. We don't provide any settors for these fields
215 because they need special handling and it's cleaner just to
216 do this in the particular functions that need to do this. */
218 #define extent_parent(e) extent_no_chase_aux_field (e, parent)
219 #define extent_children(e) extent_no_chase_aux_field (e, children)
221 #define extent_begin_glyph(e) extent_aux_field (e, begin_glyph)
222 #define extent_end_glyph(e) extent_aux_field (e, end_glyph)
223 #define extent_priority(e) extent_aux_field (e, priority)
224 #define extent_invisible(e) extent_aux_field (e, invisible)
225 #define extent_read_only(e) extent_aux_field (e, read_only)
226 #define extent_mouse_face(e) extent_aux_field (e, mouse_face)
227 #define extent_initial_redisplay_function(e) extent_aux_field (e, initial_redisplay_function)
228 #define extent_before_change_functions(e) extent_aux_field (e, before_change_functions)
229 #define extent_after_change_functions(e) extent_aux_field (e, after_change_functions)
231 #define set_extent_begin_glyph(e, value) \
232 set_extent_aux_field (e, begin_glyph, value)
233 #define set_extent_end_glyph(e, value) \
234 set_extent_aux_field (e, end_glyph, value)
235 #define set_extent_priority(e, value) \
236 set_extent_aux_field (e, priority, value)
237 #define set_extent_invisible_1(e, value) \
238 set_extent_aux_field (e, invisible, value)
239 #define set_extent_read_only(e, value) \
240 set_extent_aux_field (e, read_only, value)
241 #define set_extent_mouse_face(e, value) \
242 set_extent_aux_field (e, mouse_face, value)
243 /* Use Fset_extent_initial_redisplay_function unless you know what you're doing */
244 #define set_extent_initial_redisplay_function(e, value) \
245 set_extent_aux_field (e, initial_redisplay_function, value)
246 #define set_extent_before_change_functions(e, value) \
247 set_extent_aux_field (e, before_change_functions, value)
248 #define set_extent_after_change_functions(e, value) \
249 set_extent_aux_field (e, after_change_functions, value)
251 #define extent_face(e) extent_normal_field (e, face)
252 #define extent_begin_glyph_layout(e) extent_normal_field (e, begin_glyph_layout)
253 #define extent_end_glyph_layout(e) extent_normal_field (e, end_glyph_layout)
254 #define extent_start_open_p(e) extent_normal_field (e, start_open)
255 #define extent_end_open_p(e) extent_normal_field (e, end_open)
256 #define extent_unique_p(e) extent_normal_field (e, unique)
257 #define extent_duplicable_p(e) extent_normal_field (e, duplicable)
258 #define extent_detachable_p(e) extent_normal_field (e, detachable)
259 #define extent_internal_p(e) extent_normal_field (e, internal)
260 #define extent_in_red_event_p(e) extent_normal_field (e, in_red_event)
262 INLINE_HEADER Lisp_Object * extent_no_chase_plist_addr (EXTENT e);
263 INLINE_HEADER Lisp_Object *
264 extent_no_chase_plist_addr (EXTENT e)
266 return e->flags.has_aux ? &XCDR (e->plist) : &e->plist;
269 #define extent_no_chase_plist(e) (*extent_no_chase_plist_addr (e))
271 #define extent_plist_addr(e) extent_no_chase_plist_addr (extent_ancestor (e))
272 #define extent_plist_slot(e) extent_no_chase_plist (extent_ancestor (e))
274 /* flags for map_extents() and friends */
275 #define ME_END_CLOSED (1 << 0)
276 #define ME_START_OPEN (1 << 1)
277 #define ME_ALL_EXTENTS_CLOSED (1 << 2)
278 #define ME_ALL_EXTENTS_OPEN (2 << 2)
279 #define ME_ALL_EXTENTS_CLOSED_OPEN (3 << 2)
280 #define ME_ALL_EXTENTS_OPEN_CLOSED (4 << 2)
281 #define ME_ALL_EXTENTS_MASK (7 << 2)
282 #define ME_START_IN_REGION (1 << 5)
283 #define ME_END_IN_REGION (2 << 5)
284 #define ME_START_AND_END_IN_REGION (3 << 5)
285 #define ME_START_OR_END_IN_REGION (4 << 5)
286 #define ME_IN_REGION_MASK (7 << 5)
287 #define ME_NEGATE_IN_REGION (1 << 8)
288 /* the following flags are internal-only */
289 #define ME_INCLUDE_INTERNAL (1 << 9)
290 #define ME_MIGHT_THROW (1 << 10)
291 #define ME_MIGHT_MODIFY_TEXT (1 << 11)
292 #define ME_MIGHT_MODIFY_EXTENTS (1 << 12)
293 #define ME_MIGHT_MOVE_SOE (1 << 13)
294 #define ME_MIGHT_CALL_ELISP (ME_MIGHT_THROW | ME_MIGHT_MODIFY_TEXT | \
295 ME_MIGHT_MODIFY_EXTENTS | ME_MIGHT_MOVE_SOE)
298 #define EXTENT_LIVE_P(e) (!EQ (extent_object (e), Qt))
300 #define CHECK_LIVE_EXTENT(x) do { \
302 if (!EXTENT_LIVE_P (XEXTENT (x))) \
303 dead_wrong_type_argument (Qextent_live_p, (x)); \
305 #define CONCHECK_LIVE_EXTENT(x) do { \
306 CONCHECK_EXTENT (x); \
307 if (!EXTENT_LIVE_P (XEXTENT (x))) \
308 x = wrong_type_argument (Qextent_live_p, (x)); \
311 EXFUN (Fdetach_extent, 1);
312 EXFUN (Fextent_end_position, 1);
313 EXFUN (Fextent_object, 1);
314 EXFUN (Fextent_start_position, 1);
315 EXFUN (Fmake_extent, 3);
316 EXFUN (Fnext_single_property_change, 4);
317 EXFUN (Fprevious_single_property_change, 4);
318 EXFUN (Fset_extent_endpoints, 4);
319 EXFUN (Fnext_extent_change, 2);
320 EXFUN (Fprevious_extent_change, 2);
321 EXFUN (Fset_extent_parent, 2);
322 EXFUN (Fget_char_property, 4);
324 extern int inside_undo;
325 extern int in_modeline_generation;
327 struct extent_fragment *extent_fragment_new (Lisp_Object buffer_or_string,
329 face_index extent_fragment_update (struct window *w,
330 struct extent_fragment *ef,
331 /* Note this is in Bytinds */
332 Bytind pos, Lisp_Object last_glyph);
333 void extent_fragment_delete (struct extent_fragment *ef);
336 #ifdef emacs /* things other than emacs want the structs */
339 struct extent *allocate_extent (void);
342 EXTENT extent_ancestor_1 (EXTENT e);
344 /* extent_ancestor() chases all the parent links until there aren't any
345 more. extent_ancestor_1() does the same thing but it a function;
346 the following optimizes the most common case. */
347 INLINE_HEADER EXTENT extent_ancestor (EXTENT e);
349 extent_ancestor (EXTENT e)
351 return e->flags.has_parent ? extent_ancestor_1 (e) : e;
354 void allocate_extent_auxiliary (EXTENT ext);
355 void init_buffer_extents (struct buffer *b);
356 void uninit_buffer_extents (struct buffer *b);
357 typedef int (*map_extents_fun) (EXTENT extent, void *arg);
358 void map_extents (Bufpos from, Bufpos to, map_extents_fun fn,
359 void *arg, Lisp_Object obj, EXTENT after,
362 /* Note the following five functions are NOT in Bufpos's */
363 void adjust_extents (Lisp_Object object, Memind from,
364 Memind to, int amount);
365 void adjust_extents_for_deletion (Lisp_Object object, Bytind from,
366 Bytind to, int gapsize,
367 int numdel, int movegapsize);
368 void verify_extent_modification (Lisp_Object object, Bytind from,
370 Lisp_Object inhibit_read_only_value);
371 void process_extents_for_insertion (Lisp_Object object,
372 Bytind opoint, Bytecount length);
373 void process_extents_for_deletion (Lisp_Object object, Bytind from,
374 Bytind to, int destroy_them);
375 void report_extent_modification (Lisp_Object, Bufpos, Bufpos, int);
377 void set_extent_glyph (EXTENT extent, Lisp_Object glyph, int endp,
378 glyph_layout layout);
380 void add_string_extents (Lisp_Object string, struct buffer *buf,
381 Bytind opoint, Bytecount length);
382 void splice_in_string_extents (Lisp_Object string, struct buffer *buf,
383 Bytind opoint, Bytecount length,
385 void copy_string_extents (Lisp_Object new_string,
386 Lisp_Object old_string,
387 Bytecount new_pos, Bytecount old_pos,
390 void detach_all_extents (Lisp_Object object);
391 void set_extent_endpoints (EXTENT extent, Bytind s, Bytind e,
394 #ifdef ERROR_CHECK_EXTENTS
395 void sledgehammer_extent_check (Lisp_Object obj);
398 #ifdef MEMORY_USAGE_STATS
399 int compute_buffer_extent_usage (struct buffer *b,
400 struct overhead_stats *ovstats);
405 #endif /* INCLUDED_extents_h_ */