Mercurial > hg > xemacs-beta
annotate src/rangetab.c @ 5341:fde0802ee3e0
Zap freebsd.h.
2011-01-18 Mike Sperber <mike@xemacs.org>
* s/freebsd.h: Zap. Not really needed anymore, and it has unclear
license status.
2011-01-15 Mike Sperber <mike@xemacs.org>
* fakemail.c: #include <osreldate.h> on FreeBSD, since we no
longer have freebsd.h.
| author | Mike Sperber <sperber@deinprogramm.de> |
|---|---|
| date | Tue, 18 Jan 2011 10:01:29 +0100 |
| parents | 18c0b5909d16 |
| children | 308d34e9f07d |
| rev | line source |
|---|---|
| 428 | 1 /* XEmacs routines to deal with range tables. |
| 2 Copyright (C) 1995 Sun Microsystems, Inc. | |
|
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3 Copyright (C) 1995, 2002, 2004, 2005, 2010 Ben Wing. |
| 428 | 4 |
| 5 This file is part of XEmacs. | |
| 6 | |
| 7 XEmacs is free software; you can redistribute it and/or modify it | |
| 8 under the terms of the GNU General Public License as published by the | |
| 9 Free Software Foundation; either version 2, or (at your option) any | |
| 10 later version. | |
| 11 | |
| 12 XEmacs is distributed in the hope that it will be useful, but WITHOUT | |
| 13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 15 for more details. | |
| 16 | |
| 17 You should have received a copy of the GNU General Public License | |
| 18 along with XEmacs; see the file COPYING. If not, write to | |
| 19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
| 20 Boston, MA 02111-1307, USA. */ | |
| 21 | |
| 22 /* Synched up with: Not in FSF. */ | |
| 23 | |
| 24 /* Written by Ben Wing, August 1995. */ | |
| 25 | |
| 26 #include <config.h> | |
| 27 #include "lisp.h" | |
| 28 #include "rangetab.h" | |
| 29 | |
| 30 Lisp_Object Qrange_tablep; | |
| 31 Lisp_Object Qrange_table; | |
| 32 | |
| 2421 | 33 Lisp_Object Qstart_closed_end_open; |
| 34 Lisp_Object Qstart_open_end_open; | |
| 35 Lisp_Object Qstart_closed_end_closed; | |
| 36 Lisp_Object Qstart_open_end_closed; | |
| 37 | |
| 428 | 38 |
| 39 /************************************************************************/ | |
| 40 /* Range table object */ | |
| 41 /************************************************************************/ | |
| 42 | |
| 2421 | 43 static enum range_table_type |
| 44 range_table_symbol_to_type (Lisp_Object symbol) | |
| 45 { | |
| 46 if (NILP (symbol)) | |
| 47 return RANGE_START_CLOSED_END_OPEN; | |
| 48 | |
| 49 CHECK_SYMBOL (symbol); | |
| 50 if (EQ (symbol, Qstart_closed_end_open)) | |
| 51 return RANGE_START_CLOSED_END_OPEN; | |
| 52 if (EQ (symbol, Qstart_closed_end_closed)) | |
| 53 return RANGE_START_CLOSED_END_CLOSED; | |
| 54 if (EQ (symbol, Qstart_open_end_open)) | |
| 55 return RANGE_START_OPEN_END_OPEN; | |
| 56 if (EQ (symbol, Qstart_open_end_closed)) | |
| 57 return RANGE_START_OPEN_END_CLOSED; | |
| 58 | |
| 59 invalid_constant ("Unknown range table type", symbol); | |
| 60 RETURN_NOT_REACHED (RANGE_START_CLOSED_END_OPEN); | |
| 61 } | |
| 62 | |
| 63 static Lisp_Object | |
| 64 range_table_type_to_symbol (enum range_table_type type) | |
| 65 { | |
| 66 switch (type) | |
| 67 { | |
| 68 case RANGE_START_CLOSED_END_OPEN: | |
| 69 return Qstart_closed_end_open; | |
| 70 case RANGE_START_CLOSED_END_CLOSED: | |
| 71 return Qstart_closed_end_closed; | |
| 72 case RANGE_START_OPEN_END_OPEN: | |
| 73 return Qstart_open_end_open; | |
| 74 case RANGE_START_OPEN_END_CLOSED: | |
| 75 return Qstart_open_end_closed; | |
| 76 } | |
| 77 | |
| 2500 | 78 ABORT (); |
| 2421 | 79 return Qnil; |
| 80 } | |
| 81 | |
| 428 | 82 /* We use a sorted array of ranges. |
| 83 | |
| 84 #### We should be using the gap array stuff from extents.c. This | |
| 85 is not hard but just requires moving that stuff out of that file. */ | |
| 86 | |
| 87 static Lisp_Object | |
| 88 mark_range_table (Lisp_Object obj) | |
| 89 { | |
| 440 | 90 Lisp_Range_Table *rt = XRANGE_TABLE (obj); |
| 428 | 91 int i; |
| 92 | |
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93 for (i = 0; i < gap_array_length (rt->entries); i++) |
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94 mark_object (rangetab_gap_array_at (rt->entries, i).val); |
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95 |
| 428 | 96 return Qnil; |
| 97 } | |
| 98 | |
| 99 static void | |
| 2286 | 100 print_range_table (Lisp_Object obj, Lisp_Object printcharfun, |
| 101 int UNUSED (escapeflag)) | |
| 428 | 102 { |
| 440 | 103 Lisp_Range_Table *rt = XRANGE_TABLE (obj); |
| 428 | 104 int i; |
| 105 | |
| 2421 | 106 if (print_readably) |
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107 write_fmt_string_lisp (printcharfun, "#s(range-table :type %s :data (", |
| 2421 | 108 1, range_table_type_to_symbol (rt->type)); |
| 109 else | |
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110 write_ascstring (printcharfun, "#<range-table "); |
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111 for (i = 0; i < gap_array_length (rt->entries); i++) |
| 428 | 112 { |
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113 struct range_table_entry rte = rangetab_gap_array_at (rt->entries, i); |
| 2421 | 114 int so, ec; |
| 428 | 115 if (i > 0) |
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116 write_ascstring (printcharfun, " "); |
| 2421 | 117 switch (rt->type) |
| 118 { | |
| 119 case RANGE_START_CLOSED_END_OPEN: so = 0, ec = 0; break; | |
| 120 case RANGE_START_CLOSED_END_CLOSED: so = 0, ec = 1; break; | |
| 121 case RANGE_START_OPEN_END_OPEN: so = 1, ec = 0; break; | |
| 122 case RANGE_START_OPEN_END_CLOSED: so = 1; ec = 1; break; | |
| 2500 | 123 default: ABORT (); so = 0, ec = 0; break; |
| 2421 | 124 } |
| 125 write_fmt_string (printcharfun, "%c%ld %ld%c ", | |
| 126 print_readably ? '(' : so ? '(' : '[', | |
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127 (long) (rte.first - so), |
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128 (long) (rte.last - ec), |
| 2421 | 129 print_readably ? ')' : ec ? ']' : ')' |
| 130 ); | |
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131 print_internal (rte.val, printcharfun, 1); |
| 428 | 132 } |
| 2421 | 133 if (print_readably) |
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134 write_ascstring (printcharfun, "))"); |
| 2421 | 135 else |
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136 write_fmt_string (printcharfun, " 0x%x>", LISP_OBJECT_UID (obj)); |
| 428 | 137 } |
| 138 | |
| 139 static int | |
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140 range_table_equal (Lisp_Object obj1, Lisp_Object obj2, int depth, int foldcase) |
| 428 | 141 { |
| 440 | 142 Lisp_Range_Table *rt1 = XRANGE_TABLE (obj1); |
| 143 Lisp_Range_Table *rt2 = XRANGE_TABLE (obj2); | |
| 428 | 144 int i; |
| 145 | |
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146 if (gap_array_length (rt1->entries) != gap_array_length (rt2->entries)) |
| 428 | 147 return 0; |
| 148 | |
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149 for (i = 0; i < gap_array_length (rt1->entries); i++) |
| 428 | 150 { |
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151 struct range_table_entry *rte1 = |
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152 rangetab_gap_array_atp (rt1->entries, i); |
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153 struct range_table_entry *rte2 = |
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154 rangetab_gap_array_atp (rt2->entries, i); |
| 428 | 155 |
| 156 if (rte1->first != rte2->first | |
| 157 || rte1->last != rte2->last | |
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158 || !internal_equal_0 (rte1->val, rte2->val, depth + 1, foldcase)) |
| 428 | 159 return 0; |
| 160 } | |
| 161 | |
| 162 return 1; | |
| 163 } | |
| 164 | |
| 2515 | 165 static Hashcode |
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166 range_table_entry_hash (struct range_table_entry *rte, int depth, |
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167 Boolint equalp) |
| 428 | 168 { |
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169 return HASH3 (rte->first, rte->last, |
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170 internal_hash (rte->val, depth + 1, equalp)); |
| 428 | 171 } |
| 172 | |
| 2515 | 173 static Hashcode |
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174 range_table_hash (Lisp_Object obj, int depth, Boolint equalp) |
| 428 | 175 { |
| 440 | 176 Lisp_Range_Table *rt = XRANGE_TABLE (obj); |
| 428 | 177 int i; |
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178 int size = gap_array_length (rt->entries); |
| 2515 | 179 Hashcode hash = size; |
| 428 | 180 |
| 181 /* approach based on internal_array_hash(). */ | |
| 182 if (size <= 5) | |
| 183 { | |
| 184 for (i = 0; i < size; i++) | |
| 185 hash = HASH2 (hash, | |
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186 range_table_entry_hash |
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187 (rangetab_gap_array_atp (rt->entries, i), depth, equalp)); |
| 428 | 188 return hash; |
| 189 } | |
| 190 | |
| 191 /* just pick five elements scattered throughout the array. | |
| 192 A slightly better approach would be to offset by some | |
| 193 noise factor from the points chosen below. */ | |
| 194 for (i = 0; i < 5; i++) | |
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195 hash = HASH2 (hash, |
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196 range_table_entry_hash |
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197 (rangetab_gap_array_atp (rt->entries, i*size/5), |
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198 depth, equalp)); |
| 428 | 199 return hash; |
| 200 } | |
| 201 | |
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202 #ifndef NEW_GC |
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203 |
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204 /* #### This leaks memory under NEW_GC. To fix this, convert to Lisp object |
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205 gap array. */ |
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206 |
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207 static void |
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208 finalize_range_table (Lisp_Object obj) |
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209 { |
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210 Lisp_Range_Table *rt = XRANGE_TABLE (obj); |
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211 if (rt->entries) |
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212 { |
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213 if (!DUMPEDP (rt->entries)) |
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214 free_gap_array (rt->entries); |
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215 rt->entries = 0; |
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216 } |
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217 } |
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218 |
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219 #endif /* not NEW_GC */ |
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220 |
| 1204 | 221 static const struct memory_description rte_description_1[] = { |
| 440 | 222 { XD_LISP_OBJECT, offsetof (range_table_entry, val) }, |
| 428 | 223 { XD_END } |
| 224 }; | |
| 225 | |
| 1204 | 226 static const struct sized_memory_description rte_description = { |
| 440 | 227 sizeof (range_table_entry), |
| 428 | 228 rte_description_1 |
| 229 }; | |
| 230 | |
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231 static const struct memory_description rtega_description_1[] = { |
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232 XD_GAP_ARRAY_DESC (&rte_description), |
| 428 | 233 { XD_END } |
| 234 }; | |
| 235 | |
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236 static const struct sized_memory_description rtega_description = { |
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237 0, rtega_description_1 |
| 428 | 238 }; |
| 239 | |
| 1204 | 240 static const struct memory_description range_table_description[] = { |
| 2551 | 241 { XD_BLOCK_PTR, offsetof (Lisp_Range_Table, entries), 1, |
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242 { &rtega_description } }, |
| 428 | 243 { XD_END } |
| 244 }; | |
| 245 | |
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246 DEFINE_DUMPABLE_LISP_OBJECT ("range-table", range_table, |
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247 mark_range_table, print_range_table, |
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248 IF_OLD_GC (finalize_range_table), |
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249 range_table_equal, range_table_hash, |
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250 range_table_description, |
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251 Lisp_Range_Table); |
| 428 | 252 |
| 253 /************************************************************************/ | |
| 254 /* Range table operations */ | |
| 255 /************************************************************************/ | |
| 256 | |
| 800 | 257 #ifdef ERROR_CHECK_STRUCTURES |
| 428 | 258 |
| 259 static void | |
| 440 | 260 verify_range_table (Lisp_Range_Table *rt) |
| 428 | 261 { |
| 262 int i; | |
| 263 | |
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264 for (i = 0; i < gap_array_length (rt->entries); i++) |
| 428 | 265 { |
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266 struct range_table_entry *rte = rangetab_gap_array_atp (rt->entries, i); |
| 428 | 267 assert (rte->last >= rte->first); |
| 268 if (i > 0) | |
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269 assert (rangetab_gap_array_at (rt->entries, i - 1).last <= rte->first); |
| 428 | 270 } |
| 271 } | |
| 272 | |
| 273 #else | |
| 274 | |
| 275 #define verify_range_table(rt) | |
| 276 | |
| 277 #endif | |
| 278 | |
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279 /* Locate the range table entry corresponding to the value POS, and return |
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280 it. If found, FOUNDP is set to 1 and the return value specifies an entry |
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281 that encloses POS. Otherwise, FOUNDP is set to 0 and the return value |
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282 specifies where an entry that encloses POS would be inserted. */ |
| 428 | 283 |
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284 static Elemcount |
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285 get_range_table_pos (Elemcount pos, Elemcount nentries, |
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286 struct range_table_entry *tab, |
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287 Elemcount gappos, Elemcount gapsize, |
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288 int *foundp) |
| 428 | 289 { |
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290 Elemcount left = 0, right = nentries; |
| 428 | 291 |
| 292 /* binary search for the entry. Based on similar code in | |
| 293 extent_list_locate(). */ | |
| 294 while (left != right) | |
| 295 { | |
| 296 /* RIGHT might not point to a valid entry (i.e. it's at the end | |
| 297 of the list), so NEWPOS must round down. */ | |
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298 Elemcount newpos = (left + right) >> 1; |
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299 struct range_table_entry *entry = |
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300 tab + GAP_ARRAY_ARRAY_TO_MEMORY_POS_1 (newpos, gappos, gapsize); |
| 2421 | 301 if (pos >= entry->last) |
| 302 left = newpos + 1; | |
| 428 | 303 else if (pos < entry->first) |
| 304 right = newpos; | |
| 305 else | |
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306 { |
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307 *foundp = 1; |
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308 return newpos; |
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309 } |
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310 } |
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311 |
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312 *foundp = 0; |
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313 return left; |
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314 } |
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315 |
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316 /* Look up in a range table without the gap array wrapper. |
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317 Used also by the unified range table format. */ |
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318 |
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319 static Lisp_Object |
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320 get_range_table (Elemcount pos, Elemcount nentries, |
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321 struct range_table_entry *tab, |
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322 Elemcount gappos, Elemcount gapsize, |
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323 Lisp_Object default_) |
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324 { |
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325 int foundp; |
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326 Elemcount entrypos = get_range_table_pos (pos, nentries, tab, gappos, |
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327 gapsize, &foundp); |
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328 if (foundp) |
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329 { |
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330 struct range_table_entry *entry = |
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331 tab + GAP_ARRAY_ARRAY_TO_MEMORY_POS_1 (entrypos, gappos, gapsize); |
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332 return entry->val; |
| 428 | 333 } |
| 334 | |
| 335 return default_; | |
| 336 } | |
| 337 | |
| 338 DEFUN ("range-table-p", Frange_table_p, 1, 1, 0, /* | |
| 339 Return non-nil if OBJECT is a range table. | |
| 340 */ | |
| 341 (object)) | |
| 342 { | |
| 343 return RANGE_TABLEP (object) ? Qt : Qnil; | |
| 344 } | |
| 345 | |
| 2421 | 346 DEFUN ("range-table-type", Frange_table_type, 1, 1, 0, /* |
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347 Return the type of RANGE-TABLE. |
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348 |
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349 This will be a symbol describing how ranges in RANGE-TABLE function at their |
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350 ends; see `make-range-table'. |
| 2421 | 351 */ |
| 352 (range_table)) | |
| 353 { | |
| 354 CHECK_RANGE_TABLE (range_table); | |
| 355 return range_table_type_to_symbol (XRANGE_TABLE (range_table)->type); | |
| 356 } | |
| 357 | |
| 358 DEFUN ("make-range-table", Fmake_range_table, 0, 1, 0, /* | |
| 428 | 359 Return a new, empty range table. |
| 360 You can manipulate it using `put-range-table', `get-range-table', | |
| 361 `remove-range-table', and `clear-range-table'. | |
| 2421 | 362 Range tables allow you to efficiently set values for ranges of integers. |
| 363 | |
| 364 TYPE is a symbol indicating how ranges are assumed to function at their | |
| 365 ends. It can be one of | |
| 366 | |
| 367 SYMBOL RANGE-START RANGE-END | |
| 368 ------ ----------- --------- | |
| 369 `start-closed-end-open' (the default) closed open | |
| 370 `start-closed-end-closed' closed closed | |
| 371 `start-open-end-open' open open | |
| 372 `start-open-end-closed' open closed | |
| 373 | |
| 374 A `closed' endpoint of a range means that the number at that end is included | |
| 375 in the range. For an `open' endpoint, the number would not be included. | |
| 376 | |
| 377 For example, a closed-open range from 5 to 20 would be indicated as [5, | |
| 378 20) where a bracket indicates a closed end and a parenthesis an open end, | |
| 379 and would mean `all the numbers between 5 and 20', including 5 but not 20. | |
| 380 This seems a little strange at first but is in fact extremely common in | |
| 381 the outside world as well as in computers and makes things work sensibly. | |
| 382 For example, if I say "there are seven days between today and next week | |
| 383 today", I'm including today but not next week today; if I included both, | |
| 384 there would be eight days. Similarly, there are 15 (= 20 - 5) elements in | |
| 385 the range [5, 20), but 16 in the range [5, 20]. | |
| 428 | 386 */ |
| 2421 | 387 (type)) |
| 428 | 388 { |
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389 Lisp_Object obj = ALLOC_NORMAL_LISP_OBJECT (range_table); |
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390 Lisp_Range_Table *rt = XRANGE_TABLE (obj); |
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391 rt->entries = make_gap_array (sizeof (struct range_table_entry), 0); |
| 2421 | 392 rt->type = range_table_symbol_to_type (type); |
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393 return obj; |
| 428 | 394 } |
| 395 | |
| 396 DEFUN ("copy-range-table", Fcopy_range_table, 1, 1, 0, /* | |
| 444 | 397 Return a new range table which is a copy of RANGE-TABLE. |
| 398 It will contain the same values for the same ranges as RANGE-TABLE. | |
| 399 The values will not themselves be copied. | |
| 428 | 400 */ |
| 444 | 401 (range_table)) |
| 428 | 402 { |
| 440 | 403 Lisp_Range_Table *rt, *rtnew; |
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404 Lisp_Object obj; |
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405 Elemcount i; |
| 428 | 406 |
| 444 | 407 CHECK_RANGE_TABLE (range_table); |
| 408 rt = XRANGE_TABLE (range_table); | |
| 428 | 409 |
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410 obj = ALLOC_NORMAL_LISP_OBJECT (range_table); |
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411 rtnew = XRANGE_TABLE (obj); |
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412 rtnew->entries = make_gap_array (sizeof (struct range_table_entry), 0); |
| 2421 | 413 rtnew->type = rt->type; |
| 428 | 414 |
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415 for (i = 0; i < gap_array_length (rt->entries); i++) |
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416 rtnew->entries = |
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417 gap_array_insert_els (rtnew->entries, i, |
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418 rangetab_gap_array_atp (rt->entries, i), 1); |
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419 return obj; |
| 428 | 420 } |
| 421 | |
| 422 DEFUN ("get-range-table", Fget_range_table, 2, 3, 0, /* | |
| 444 | 423 Find value for position POS in RANGE-TABLE. |
| 428 | 424 If there is no corresponding value, return DEFAULT (defaults to nil). |
| 425 */ | |
| 444 | 426 (pos, range_table, default_)) |
| 428 | 427 { |
| 440 | 428 Lisp_Range_Table *rt; |
| 428 | 429 |
| 444 | 430 CHECK_RANGE_TABLE (range_table); |
| 431 rt = XRANGE_TABLE (range_table); | |
| 428 | 432 |
| 433 CHECK_INT_COERCE_CHAR (pos); | |
| 434 | |
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435 return get_range_table (XINT (pos), gap_array_length (rt->entries), |
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436 gap_array_begin (rt->entries, |
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437 struct range_table_entry), |
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438 gap_array_gappos (rt->entries), |
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439 gap_array_gapsize (rt->entries), |
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440 default_); |
| 428 | 441 } |
| 442 | |
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443 static void |
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444 external_to_internal_adjust_ends (enum range_table_type type, |
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445 EMACS_INT *first, EMACS_INT *last) |
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446 { |
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447 /* Fix up the numbers in accordance with the open/closedness to make |
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448 them behave like default open/closed. */ |
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449 switch (type) |
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450 { |
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451 case RANGE_START_CLOSED_END_OPEN: break; |
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452 case RANGE_START_CLOSED_END_CLOSED: (*last)++; break; |
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453 case RANGE_START_OPEN_END_OPEN: (*first)++; break; |
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454 case RANGE_START_OPEN_END_CLOSED: (*first)++, (*last)++; break; |
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455 } |
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456 } |
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457 |
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458 static void |
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459 internal_to_external_adjust_ends (enum range_table_type type, |
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460 EMACS_INT *first, EMACS_INT *last) |
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461 { |
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462 /* Reverse the changes made in external_to_internal_adjust_ends(). |
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463 */ |
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464 switch (type) |
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465 { |
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466 case RANGE_START_CLOSED_END_OPEN: break; |
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467 case RANGE_START_CLOSED_END_CLOSED: (*last)--; break; |
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468 case RANGE_START_OPEN_END_OPEN: (*first)--; break; |
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469 case RANGE_START_OPEN_END_CLOSED: (*first)--, (*last)--; break; |
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470 } |
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471 } |
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472 |
| 428 | 473 void |
| 474 put_range_table (Lisp_Object table, EMACS_INT first, | |
| 475 EMACS_INT last, Lisp_Object val) | |
| 476 { | |
| 477 int i; | |
| 478 int insert_me_here = -1; | |
| 440 | 479 Lisp_Range_Table *rt = XRANGE_TABLE (table); |
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480 int foundp; |
| 428 | 481 |
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482 external_to_internal_adjust_ends (rt->type, &first, &last); |
| 2421 | 483 if (first == last) |
| 484 return; | |
| 485 if (first > last) | |
| 486 /* This will happen if originally first == last and both ends are | |
| 487 open. #### Should we signal an error? */ | |
| 488 return; | |
| 489 | |
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490 if (DUMPEDP (rt->entries)) |
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491 rt->entries = gap_array_clone (rt->entries); |
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492 |
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493 i = get_range_table_pos (first, gap_array_length (rt->entries), |
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494 gap_array_begin (rt->entries, |
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495 struct range_table_entry), |
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496 gap_array_gappos (rt->entries), |
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497 gap_array_gapsize (rt->entries), &foundp); |
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498 |
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499 #ifdef ERROR_CHECK_TYPES |
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500 if (foundp) |
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501 { |
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502 if (i < gap_array_length (rt->entries)) |
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503 { |
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504 struct range_table_entry *entry = |
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505 rangetab_gap_array_atp (rt->entries, i); |
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506 assert (first >= entry->first && first < entry->last); |
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507 } |
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508 } |
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509 else |
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510 { |
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511 if (i < gap_array_length (rt->entries)) |
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512 { |
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513 struct range_table_entry *entry = |
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514 rangetab_gap_array_atp (rt->entries, i); |
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515 assert (first < entry->first); |
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516 } |
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517 if (i > 0) |
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518 { |
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519 struct range_table_entry *entry = |
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520 rangetab_gap_array_atp (rt->entries, i - 1); |
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521 assert (first >= entry->last); |
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522 } |
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523 } |
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524 #endif /* ERROR_CHECK_TYPES */ |
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525 |
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526 /* If the beginning of the new range isn't within any existing range, |
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527 it might still be just grazing the end of an end-open range (remember, |
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528 internally all ranges are start-close end-open); so back up one |
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529 so we consider this range. */ |
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530 if (!foundp && i > 0) |
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531 i--; |
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532 |
| 428 | 533 /* Now insert in the proper place. This gets tricky because |
| 534 we may be overlapping one or more existing ranges and need | |
| 535 to fix them up. */ | |
| 536 | |
| 537 /* First delete all sections of any existing ranges that overlap | |
| 538 the new range. */ | |
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539 for (; i < gap_array_length (rt->entries); i++) |
| 428 | 540 { |
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541 struct range_table_entry *entry = |
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542 rangetab_gap_array_atp (rt->entries, i); |
| 428 | 543 /* We insert before the first range that begins at or after the |
| 544 new range. */ | |
| 545 if (entry->first >= first && insert_me_here < 0) | |
| 546 insert_me_here = i; | |
| 547 if (entry->last < first) | |
| 548 /* completely before the new range. */ | |
| 549 continue; | |
| 550 if (entry->first > last) | |
| 551 /* completely after the new range. No more possibilities of | |
| 552 finding overlapping ranges. */ | |
| 553 break; | |
| 2421 | 554 /* At this point the existing ENTRY overlaps or touches the new one. */ |
| 428 | 555 if (entry->first < first && entry->last <= last) |
| 556 { | |
| 557 /* looks like: | |
| 558 | |
| 2421 | 559 [ NEW ) |
| 560 [ EXISTING ) | |
| 561 | |
| 562 or | |
| 563 | |
| 564 [ NEW ) | |
| 565 [ EXISTING ) | |
| 428 | 566 |
| 567 */ | |
| 568 /* truncate the end off of it. */ | |
| 2421 | 569 entry->last = first; |
| 428 | 570 } |
| 571 else if (entry->first < first && entry->last > last) | |
| 572 /* looks like: | |
| 573 | |
| 2421 | 574 [ NEW ) |
| 575 [ EXISTING ) | |
| 428 | 576 |
| 577 */ | |
| 578 /* need to split this one in two. */ | |
| 579 { | |
| 580 struct range_table_entry insert_me_too; | |
| 581 | |
| 2421 | 582 insert_me_too.first = last; |
| 428 | 583 insert_me_too.last = entry->last; |
| 584 insert_me_too.val = entry->val; | |
| 2421 | 585 entry->last = first; |
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586 rt->entries = |
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587 gap_array_insert_els (rt->entries, i + 1, &insert_me_too, 1); |
| 428 | 588 } |
| 2421 | 589 else if (entry->last >= last) |
| 428 | 590 { |
| 591 /* looks like: | |
| 592 | |
| 2421 | 593 [ NEW ) |
| 594 [ EXISTING ) | |
| 595 | |
| 596 or | |
| 597 | |
| 598 [ NEW ) | |
| 599 [ EXISTING ) | |
| 428 | 600 |
| 601 */ | |
| 602 /* truncate the start off of it. */ | |
| 2421 | 603 entry->first = last; |
| 428 | 604 } |
| 605 else | |
| 606 { | |
| 607 /* existing is entirely within new. */ | |
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608 gap_array_delete_els (rt->entries, i, 1); |
| 428 | 609 i--; /* back up since everything shifted one to the left. */ |
| 610 } | |
| 611 } | |
| 612 | |
| 613 /* Someone asked us to delete the range, not insert it. */ | |
| 614 if (UNBOUNDP (val)) | |
| 615 return; | |
| 616 | |
| 617 /* Now insert the new entry, maybe at the end. */ | |
| 618 | |
| 619 if (insert_me_here < 0) | |
| 620 insert_me_here = i; | |
| 621 | |
| 622 { | |
| 623 struct range_table_entry insert_me; | |
| 624 | |
| 625 insert_me.first = first; | |
| 626 insert_me.last = last; | |
| 627 insert_me.val = val; | |
| 628 | |
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629 rt->entries = |
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630 gap_array_insert_els (rt->entries, insert_me_here, &insert_me, 1); |
| 428 | 631 } |
| 632 | |
| 633 /* Now see if we can combine this entry with adjacent ones just | |
| 634 before or after. */ | |
| 635 | |
| 636 if (insert_me_here > 0) | |
| 637 { | |
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638 struct range_table_entry *entry = |
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639 rangetab_gap_array_atp (rt->entries, insert_me_here - 1); |
| 2421 | 640 if (EQ (val, entry->val) && entry->last == first) |
| 428 | 641 { |
| 642 entry->last = last; | |
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643 gap_array_delete_els (rt->entries, insert_me_here, 1); |
| 428 | 644 insert_me_here--; |
| 645 /* We have morphed into a larger range. Update our records | |
| 646 in case we also combine with the one after. */ | |
| 647 first = entry->first; | |
| 648 } | |
| 649 } | |
| 650 | |
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651 if (insert_me_here < gap_array_length (rt->entries) - 1) |
| 428 | 652 { |
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653 struct range_table_entry *entry = |
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654 rangetab_gap_array_atp (rt->entries, insert_me_here + 1); |
| 2421 | 655 if (EQ (val, entry->val) && entry->first == last) |
| 428 | 656 { |
| 657 entry->first = first; | |
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658 gap_array_delete_els (rt->entries, insert_me_here, 1); |
| 428 | 659 } |
| 660 } | |
| 661 } | |
| 662 | |
| 663 DEFUN ("put-range-table", Fput_range_table, 4, 4, 0, /* | |
| 2421 | 664 Set the value for range START .. END to be VALUE in RANGE-TABLE. |
| 428 | 665 */ |
| 444 | 666 (start, end, value, range_table)) |
| 428 | 667 { |
| 668 EMACS_INT first, last; | |
| 669 | |
| 444 | 670 CHECK_RANGE_TABLE (range_table); |
| 428 | 671 CHECK_INT_COERCE_CHAR (start); |
| 672 first = XINT (start); | |
| 673 CHECK_INT_COERCE_CHAR (end); | |
| 674 last = XINT (end); | |
| 675 if (first > last) | |
| 563 | 676 invalid_argument_2 ("start must be <= end", start, end); |
| 428 | 677 |
| 444 | 678 put_range_table (range_table, first, last, value); |
| 679 verify_range_table (XRANGE_TABLE (range_table)); | |
| 428 | 680 return Qnil; |
| 681 } | |
| 682 | |
| 683 DEFUN ("remove-range-table", Fremove_range_table, 3, 3, 0, /* | |
| 2421 | 684 Remove the value for range START .. END in RANGE-TABLE. |
| 428 | 685 */ |
| 444 | 686 (start, end, range_table)) |
| 428 | 687 { |
| 444 | 688 return Fput_range_table (start, end, Qunbound, range_table); |
| 428 | 689 } |
| 690 | |
| 691 DEFUN ("clear-range-table", Fclear_range_table, 1, 1, 0, /* | |
| 444 | 692 Flush RANGE-TABLE. |
| 428 | 693 */ |
| 444 | 694 (range_table)) |
| 428 | 695 { |
| 444 | 696 CHECK_RANGE_TABLE (range_table); |
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697 gap_array_delete_all_els (XRANGE_TABLE (range_table)->entries); |
| 428 | 698 return Qnil; |
| 699 } | |
| 700 | |
| 701 DEFUN ("map-range-table", Fmap_range_table, 2, 2, 0, /* | |
| 444 | 702 Map FUNCTION over entries in RANGE-TABLE, calling it with three args, |
| 428 | 703 the beginning and end of the range and the corresponding value. |
| 442 | 704 |
| 705 Results are guaranteed to be correct (i.e. each entry processed | |
| 706 exactly once) if FUNCTION modifies or deletes the current entry | |
| 444 | 707 \(i.e. passes the current range to `put-range-table' or |
|
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708 `remove-range-table'). If FUNCTION modifies or deletes any other entry, |
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709 this guarantee doesn't hold. |
| 428 | 710 */ |
| 444 | 711 (function, range_table)) |
| 428 | 712 { |
| 442 | 713 Lisp_Range_Table *rt; |
| 714 int i; | |
| 715 | |
| 444 | 716 CHECK_RANGE_TABLE (range_table); |
| 442 | 717 CHECK_FUNCTION (function); |
| 718 | |
| 444 | 719 rt = XRANGE_TABLE (range_table); |
| 442 | 720 |
| 721 /* Do not "optimize" by pulling out the length computation below! | |
| 722 FUNCTION may have changed the table. */ | |
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723 for (i = 0; i < gap_array_length (rt->entries); i++) |
| 442 | 724 { |
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725 struct range_table_entry entry = |
|
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726 rangetab_gap_array_at (rt->entries, i); |
| 442 | 727 EMACS_INT first, last; |
| 728 Lisp_Object args[4]; | |
| 729 int oldlen; | |
| 730 | |
| 731 again: | |
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732 first = entry.first; |
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733 last = entry.last; |
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734 oldlen = gap_array_length (rt->entries); |
| 442 | 735 args[0] = function; |
| 2952 | 736 /* Fix up the numbers in accordance with the open/closedness of the |
| 737 table. */ | |
| 738 { | |
| 739 EMACS_INT premier = first, dernier = last; | |
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740 internal_to_external_adjust_ends (rt->type, &premier, &dernier); |
| 2952 | 741 args[1] = make_int (premier); |
| 742 args[2] = make_int (dernier); | |
| 743 } | |
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744 args[3] = entry.val; |
| 442 | 745 Ffuncall (countof (args), args); |
| 746 /* Has FUNCTION removed the entry? */ | |
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747 if (oldlen > gap_array_length (rt->entries) |
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748 && i < gap_array_length (rt->entries) |
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749 && (first != entry.first || last != entry.last)) |
| 442 | 750 goto again; |
| 751 } | |
| 752 | |
| 428 | 753 return Qnil; |
| 754 } | |
| 755 | |
| 756 | |
| 757 /************************************************************************/ | |
| 758 /* Range table read syntax */ | |
| 759 /************************************************************************/ | |
| 760 | |
| 761 static int | |
| 2421 | 762 rangetab_type_validate (Lisp_Object UNUSED (keyword), Lisp_Object value, |
| 763 Error_Behavior UNUSED (errb)) | |
| 764 { | |
| 765 /* #### should deal with ERRB */ | |
| 766 range_table_symbol_to_type (value); | |
| 767 return 1; | |
| 768 } | |
| 769 | |
| 770 static int | |
| 2286 | 771 rangetab_data_validate (Lisp_Object UNUSED (keyword), Lisp_Object value, |
| 772 Error_Behavior UNUSED (errb)) | |
| 428 | 773 { |
| 2367 | 774 /* #### should deal with ERRB */ |
| 775 EXTERNAL_PROPERTY_LIST_LOOP_3 (range, data, value) | |
| 428 | 776 { |
| 777 if (!INTP (range) && !CHARP (range) | |
| 778 && !(CONSP (range) && CONSP (XCDR (range)) | |
| 779 && NILP (XCDR (XCDR (range))) | |
| 780 && (INTP (XCAR (range)) || CHARP (XCAR (range))) | |
| 781 && (INTP (XCAR (XCDR (range))) || CHARP (XCAR (XCDR (range)))))) | |
| 563 | 782 sferror ("Invalid range format", range); |
| 428 | 783 } |
| 784 | |
| 785 return 1; | |
| 786 } | |
| 787 | |
| 788 static Lisp_Object | |
| 2421 | 789 rangetab_instantiate (Lisp_Object plist) |
| 428 | 790 { |
| 2425 | 791 Lisp_Object data = Qnil, type = Qnil, rangetab; |
| 428 | 792 |
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793 if (KEYWORDP (Fcar (plist))) |
| 428 | 794 { |
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795 PROPERTY_LIST_LOOP_3 (key, value, plist) |
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796 { |
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797 if (EQ (key, Q_type)) type = value; |
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798 else if (EQ (key, Q_data)) data = value; |
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799 else if (!KEYWORDP (key)) |
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800 signal_error |
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801 (Qinvalid_read_syntax, |
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802 "can't mix keyword and non-keyword structure syntax", |
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803 key); |
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804 else |
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805 ABORT (); |
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806 } |
| 2421 | 807 } |
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808 #ifdef NEED_TO_HANDLE_21_4_CODE |
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809 else |
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810 { |
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811 PROPERTY_LIST_LOOP_3 (key, value, plist) |
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812 { |
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813 if (EQ (key, Qtype)) type = value; |
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814 else if (EQ (key, Qdata)) data = value; |
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815 else if (KEYWORDP (key)) |
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816 signal_error |
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817 (Qinvalid_read_syntax, |
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818 "can't mix keyword and non-keyword structure syntax", |
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819 key); |
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820 else |
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821 ABORT (); |
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822 } |
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823 } |
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824 #endif /* NEED_TO_HANDLE_21_4_CODE */ |
| 2421 | 825 |
| 2425 | 826 rangetab = Fmake_range_table (type); |
| 428 | 827 |
| 2421 | 828 { |
| 829 PROPERTY_LIST_LOOP_3 (range, val, data) | |
| 830 { | |
| 831 if (CONSP (range)) | |
| 832 Fput_range_table (Fcar (range), Fcar (Fcdr (range)), val, | |
| 833 rangetab); | |
| 834 else | |
| 835 Fput_range_table (range, range, val, rangetab); | |
| 836 } | |
| 837 } | |
| 428 | 838 |
| 839 return rangetab; | |
| 840 } | |
| 841 | |
| 842 | |
| 843 /************************************************************************/ | |
| 844 /* Unified range tables */ | |
| 845 /************************************************************************/ | |
| 846 | |
| 847 /* A "unified range table" is a format for storing range tables | |
| 848 as contiguous blocks of memory. This is used by the regexp | |
| 849 code, which needs to use range tables to properly handle [] | |
| 850 constructs in the presence of extended characters but wants to | |
| 851 store an entire compiled pattern as a contiguous block of memory. | |
| 852 | |
| 853 Unified range tables are designed so that they can be placed | |
| 854 at an arbitrary (possibly mis-aligned) place in memory. | |
| 855 (Dealing with alignment is a pain in the ass.) | |
| 856 | |
| 857 WARNING: No provisions for garbage collection are currently made. | |
| 858 This means that there must not be any Lisp objects in a unified | |
| 859 range table that need to be marked for garbage collection. | |
| 860 Good candidates for objects that can go into a range table are | |
| 861 | |
| 862 -- numbers and characters (do not need to be marked) | |
| 863 -- nil, t (marked elsewhere) | |
| 864 -- charsets and coding systems (automatically marked because | |
| 865 they are in a marked list, | |
| 866 and can't be removed) | |
| 867 | |
| 868 Good but slightly less so: | |
| 869 | |
| 870 -- symbols (could be uninterned, but that is not likely) | |
| 871 | |
| 872 Somewhat less good: | |
| 873 | |
| 874 -- buffers, frames, devices (could get deleted) | |
| 875 | |
| 876 | |
| 877 It is expected that you work with range tables in the normal | |
| 878 format and then convert to unified format when you are done | |
| 879 making modifications. As such, no functions are provided | |
| 880 for modifying a unified range table. The only operations | |
| 881 you can do to unified range tables are | |
| 882 | |
| 883 -- look up a value | |
| 884 -- retrieve all the ranges in an iterative fashion | |
| 885 | |
| 886 */ | |
| 887 | |
| 888 /* The format of a unified range table is as follows: | |
| 889 | |
| 890 -- The first byte contains the number of bytes to skip to find the | |
| 891 actual start of the table. This deals with alignment constraints, | |
| 892 since the table might want to go at any arbitrary place in memory. | |
| 893 -- The next three bytes contain the number of bytes to skip (from the | |
| 894 *first* byte) to find the stuff after the table. It's stored in | |
| 895 little-endian format because that's how God intended things. We don't | |
| 896 necessarily start the stuff at the very end of the table because | |
| 897 we want to have at least ALIGNOF (EMACS_INT) extra space in case | |
| 898 we have to move the range table around. (It appears that some | |
| 899 architectures don't maintain alignment when reallocing.) | |
| 900 -- At the prescribed offset is a struct unified_range_table, containing | |
| 901 some number of `struct range_table_entry' entries. */ | |
| 902 | |
| 903 struct unified_range_table | |
| 904 { | |
| 905 int nentries; | |
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906 enum range_table_type type; |
| 428 | 907 struct range_table_entry first; |
| 908 }; | |
| 909 | |
| 910 /* Return size in bytes needed to store the data in a range table. */ | |
| 911 | |
| 912 int | |
| 913 unified_range_table_bytes_needed (Lisp_Object rangetab) | |
| 914 { | |
| 915 return (sizeof (struct range_table_entry) * | |
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916 (gap_array_length (XRANGE_TABLE (rangetab)->entries) - 1) + |
| 428 | 917 sizeof (struct unified_range_table) + |
| 918 /* ALIGNOF a struct may be too big. */ | |
| 919 /* We have four bytes for the size numbers, and an extra | |
| 920 four or eight bytes for making sure we get the alignment | |
| 921 OK. */ | |
| 922 ALIGNOF (EMACS_INT) + 4); | |
| 923 } | |
| 924 | |
| 925 /* Convert a range table into unified format and store in DEST, | |
| 926 which must be able to hold the number of bytes returned by | |
| 927 range_table_bytes_needed(). */ | |
| 928 | |
| 929 void | |
| 930 unified_range_table_copy_data (Lisp_Object rangetab, void *dest) | |
| 931 { | |
| 932 /* We cast to the above structure rather than just casting to | |
| 933 char * and adding sizeof(int), because that will lead to | |
| 934 mis-aligned data on the Alpha machines. */ | |
| 935 struct unified_range_table *un; | |
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936 Gap_Array *rtega = XRANGE_TABLE (rangetab)->entries; |
| 428 | 937 int total_needed = unified_range_table_bytes_needed (rangetab); |
| 826 | 938 void *new_dest = ALIGN_PTR ((char *) dest + 4, EMACS_INT); |
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939 Elemcount i; |
| 428 | 940 |
| 941 * (char *) dest = (char) ((char *) new_dest - (char *) dest); | |
| 942 * ((unsigned char *) dest + 1) = total_needed & 0xFF; | |
| 943 total_needed >>= 8; | |
| 944 * ((unsigned char *) dest + 2) = total_needed & 0xFF; | |
| 945 total_needed >>= 8; | |
| 946 * ((unsigned char *) dest + 3) = total_needed & 0xFF; | |
| 947 un = (struct unified_range_table *) new_dest; | |
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948 un->nentries = gap_array_length (rtega); |
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949 un->type = XRANGE_TABLE (rangetab)->type; |
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950 for (i = 0; i < gap_array_length (rtega); i++) |
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951 (&un->first)[i] = rangetab_gap_array_at (rtega, i); |
| 428 | 952 } |
| 953 | |
| 954 /* Return number of bytes actually used by a unified range table. */ | |
| 955 | |
| 956 int | |
| 957 unified_range_table_bytes_used (void *unrangetab) | |
| 958 { | |
| 959 return ((* ((unsigned char *) unrangetab + 1)) | |
| 960 + ((* ((unsigned char *) unrangetab + 2)) << 8) | |
| 961 + ((* ((unsigned char *) unrangetab + 3)) << 16)); | |
| 962 } | |
| 963 | |
| 964 /* Make sure the table is aligned, and move it around if it's not. */ | |
| 965 static void | |
| 966 align_the_damn_table (void *unrangetab) | |
| 967 { | |
| 968 void *cur_dest = (char *) unrangetab + * (char *) unrangetab; | |
| 826 | 969 if (cur_dest != ALIGN_PTR (cur_dest, EMACS_INT)) |
| 428 | 970 { |
| 971 int count = (unified_range_table_bytes_used (unrangetab) - 4 | |
| 972 - ALIGNOF (EMACS_INT)); | |
| 973 /* Find the proper location, just like above. */ | |
| 826 | 974 void *new_dest = ALIGN_PTR ((char *) unrangetab + 4, EMACS_INT); |
| 428 | 975 /* memmove() works in the presence of overlapping data. */ |
| 976 memmove (new_dest, cur_dest, count); | |
| 977 * (char *) unrangetab = (char) ((char *) new_dest - (char *) unrangetab); | |
| 978 } | |
| 979 } | |
| 980 | |
| 981 /* Look up a value in a unified range table. */ | |
| 982 | |
| 983 Lisp_Object | |
| 984 unified_range_table_lookup (void *unrangetab, EMACS_INT pos, | |
| 985 Lisp_Object default_) | |
| 986 { | |
| 987 void *new_dest; | |
| 988 struct unified_range_table *un; | |
| 989 | |
| 990 align_the_damn_table (unrangetab); | |
| 991 new_dest = (char *) unrangetab + * (char *) unrangetab; | |
| 992 un = (struct unified_range_table *) new_dest; | |
| 993 | |
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994 return get_range_table (pos, un->nentries, &un->first, 0, 0, default_); |
| 428 | 995 } |
| 996 | |
| 997 /* Return number of entries in a unified range table. */ | |
| 998 | |
| 999 int | |
| 1000 unified_range_table_nentries (void *unrangetab) | |
| 1001 { | |
| 1002 void *new_dest; | |
| 1003 struct unified_range_table *un; | |
| 1004 | |
| 1005 align_the_damn_table (unrangetab); | |
| 1006 new_dest = (char *) unrangetab + * (char *) unrangetab; | |
| 1007 un = (struct unified_range_table *) new_dest; | |
| 1008 return un->nentries; | |
| 1009 } | |
| 1010 | |
| 1011 /* Return the OFFSETth range (counting from 0) in UNRANGETAB. */ | |
| 1012 void | |
| 1013 unified_range_table_get_range (void *unrangetab, int offset, | |
| 1014 EMACS_INT *min, EMACS_INT *max, | |
| 1015 Lisp_Object *val) | |
| 1016 { | |
| 1017 void *new_dest; | |
| 1018 struct unified_range_table *un; | |
| 1019 struct range_table_entry *tab; | |
| 1020 | |
| 1021 align_the_damn_table (unrangetab); | |
| 1022 new_dest = (char *) unrangetab + * (char *) unrangetab; | |
| 1023 un = (struct unified_range_table *) new_dest; | |
| 1024 | |
| 1025 assert (offset >= 0 && offset < un->nentries); | |
| 1026 tab = (&un->first) + offset; | |
| 1027 *min = tab->first; | |
| 1028 *max = tab->last; | |
| 1029 *val = tab->val; | |
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1030 |
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1031 internal_to_external_adjust_ends (un->type, min, max); |
| 428 | 1032 } |
| 1033 | |
| 1034 | |
| 1035 /************************************************************************/ | |
| 1036 /* Initialization */ | |
| 1037 /************************************************************************/ | |
| 1038 | |
| 1039 void | |
| 1040 syms_of_rangetab (void) | |
| 1041 { | |
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1042 INIT_LISP_OBJECT (range_table); |
| 442 | 1043 |
| 563 | 1044 DEFSYMBOL_MULTIWORD_PREDICATE (Qrange_tablep); |
| 1045 DEFSYMBOL (Qrange_table); | |
| 428 | 1046 |
| 2421 | 1047 DEFSYMBOL (Qstart_closed_end_open); |
| 1048 DEFSYMBOL (Qstart_open_end_open); | |
| 1049 DEFSYMBOL (Qstart_closed_end_closed); | |
| 1050 DEFSYMBOL (Qstart_open_end_closed); | |
| 1051 | |
| 428 | 1052 DEFSUBR (Frange_table_p); |
| 2421 | 1053 DEFSUBR (Frange_table_type); |
| 428 | 1054 DEFSUBR (Fmake_range_table); |
| 1055 DEFSUBR (Fcopy_range_table); | |
| 1056 DEFSUBR (Fget_range_table); | |
| 1057 DEFSUBR (Fput_range_table); | |
| 1058 DEFSUBR (Fremove_range_table); | |
| 1059 DEFSUBR (Fclear_range_table); | |
| 1060 DEFSUBR (Fmap_range_table); | |
| 1061 } | |
| 1062 | |
| 1063 void | |
| 1064 structure_type_create_rangetab (void) | |
| 1065 { | |
| 1066 struct structure_type *st; | |
| 1067 | |
| 1068 st = define_structure_type (Qrange_table, 0, rangetab_instantiate); | |
| 1069 | |
|
5222
18c0b5909d16
Use keywords in structure syntax; new #define, NEED_TO_HANDLE_21_4_CODE 1
Aidan Kehoe <kehoea@parhasard.net>
parents:
5191
diff
changeset
|
1070 define_structure_type_keyword (st, Q_data, rangetab_data_validate); |
|
18c0b5909d16
Use keywords in structure syntax; new #define, NEED_TO_HANDLE_21_4_CODE 1
Aidan Kehoe <kehoea@parhasard.net>
parents:
5191
diff
changeset
|
1071 define_structure_type_keyword (st, Q_type, rangetab_type_validate); |
|
18c0b5909d16
Use keywords in structure syntax; new #define, NEED_TO_HANDLE_21_4_CODE 1
Aidan Kehoe <kehoea@parhasard.net>
parents:
5191
diff
changeset
|
1072 #ifdef NEED_TO_HANDLE_21_4_CODE |
| 428 | 1073 define_structure_type_keyword (st, Qdata, rangetab_data_validate); |
| 2421 | 1074 define_structure_type_keyword (st, Qtype, rangetab_type_validate); |
|
5222
18c0b5909d16
Use keywords in structure syntax; new #define, NEED_TO_HANDLE_21_4_CODE 1
Aidan Kehoe <kehoea@parhasard.net>
parents:
5191
diff
changeset
|
1075 #endif /* NEED_TO_HANDLE_21_4_CODE */ |
| 428 | 1076 } |