Mercurial > hg > xemacs-beta
annotate src/rangetab.c @ 5908:6174848f3e6c
Use parse_integer() in read_atom(); support bases with ratios like integers
src/ChangeLog addition:
2015-05-08 Aidan Kehoe <kehoea@parhasard.net>
* data.c (init_errors_once_early):
Move the Qunsupported_type here from numbers.c, so it's available
when the majority of our types are not supported.
* general-slots.h: Add it here, too.
* number.c: Remove the definition of Qunsupported_type from here.
* lread.c (read_atom):
Check if the first character could reflect a rational, if so, call
parse_integer(), don't check the syntax of the other
characters. This allows us to accept the non-ASCII digit
characters too.
If that worked partially, but not completely, and the next char is
a slash, try to parse as a ratio.
If that fails, try isfloat_string(), but only if the first
character could plausibly be part of a float.
Otherwise, treat as a symbol.
* lread.c (read_rational):
Rename from read_integer. Handle ratios with the same radix
specification as was used for integers.
* lread.c (read1):
Rename read_integer in this function. Support the Common Lisp
#NNNrMMM syntax for parsing a number MMM of arbitrary radix NNN.
man/ChangeLog addition:
2015-05-08 Aidan Kehoe <kehoea@parhasard.net>
* lispref/numbers.texi (Numbers):
Describe the newly-supported arbitrary-base syntax for rationals
(integers and ratios). Describe that ratios can take the same base
specification as integers, something also new.
tests/ChangeLog addition:
2015-05-08 Aidan Kehoe <kehoea@parhasard.net>
* automated/lisp-reader-tests.el:
Check the arbitrary-base integer reader syntax support, just
added. Check the reader base support for ratios, just added.
Check the non-ASCII-digit support in the reader, just added.
author | Aidan Kehoe <kehoea@parhasard.net> |
---|---|
date | Sat, 09 May 2015 00:40:57 +0100 |
parents | 56144c8593a8 |
children |
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 | |
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7 XEmacs is free software: you can redistribute it and/or modify it |
428 | 8 under the terms of the GNU General Public License as published by the |
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9 Free Software Foundation, either version 3 of the License, or (at your |
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10 option) any later version. |
428 | 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 | |
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18 along with XEmacs. If not, see <http://www.gnu.org/licenses/>. */ |
428 | 19 |
20 /* Synched up with: Not in FSF. */ | |
21 | |
22 /* Written by Ben Wing, August 1995. */ | |
23 | |
24 #include <config.h> | |
25 #include "lisp.h" | |
26 #include "rangetab.h" | |
27 | |
28 Lisp_Object Qrange_tablep; | |
29 Lisp_Object Qrange_table; | |
30 | |
2421 | 31 Lisp_Object Qstart_closed_end_open; |
32 Lisp_Object Qstart_open_end_open; | |
33 Lisp_Object Qstart_closed_end_closed; | |
34 Lisp_Object Qstart_open_end_closed; | |
35 | |
428 | 36 |
37 /************************************************************************/ | |
38 /* Range table object */ | |
39 /************************************************************************/ | |
40 | |
2421 | 41 static enum range_table_type |
42 range_table_symbol_to_type (Lisp_Object symbol) | |
43 { | |
44 if (NILP (symbol)) | |
45 return RANGE_START_CLOSED_END_OPEN; | |
46 | |
47 CHECK_SYMBOL (symbol); | |
48 if (EQ (symbol, Qstart_closed_end_open)) | |
49 return RANGE_START_CLOSED_END_OPEN; | |
50 if (EQ (symbol, Qstart_closed_end_closed)) | |
51 return RANGE_START_CLOSED_END_CLOSED; | |
52 if (EQ (symbol, Qstart_open_end_open)) | |
53 return RANGE_START_OPEN_END_OPEN; | |
54 if (EQ (symbol, Qstart_open_end_closed)) | |
55 return RANGE_START_OPEN_END_CLOSED; | |
56 | |
57 invalid_constant ("Unknown range table type", symbol); | |
58 RETURN_NOT_REACHED (RANGE_START_CLOSED_END_OPEN); | |
59 } | |
60 | |
61 static Lisp_Object | |
62 range_table_type_to_symbol (enum range_table_type type) | |
63 { | |
64 switch (type) | |
65 { | |
66 case RANGE_START_CLOSED_END_OPEN: | |
67 return Qstart_closed_end_open; | |
68 case RANGE_START_CLOSED_END_CLOSED: | |
69 return Qstart_closed_end_closed; | |
70 case RANGE_START_OPEN_END_OPEN: | |
71 return Qstart_open_end_open; | |
72 case RANGE_START_OPEN_END_CLOSED: | |
73 return Qstart_open_end_closed; | |
74 } | |
75 | |
2500 | 76 ABORT (); |
2421 | 77 return Qnil; |
78 } | |
79 | |
428 | 80 /* We use a sorted array of ranges. |
81 | |
82 #### We should be using the gap array stuff from extents.c. This | |
83 is not hard but just requires moving that stuff out of that file. */ | |
84 | |
85 static Lisp_Object | |
86 mark_range_table (Lisp_Object obj) | |
87 { | |
440 | 88 Lisp_Range_Table *rt = XRANGE_TABLE (obj); |
428 | 89 int i; |
90 | |
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91 for (i = 0; i < gap_array_length (rt->entries); i++) |
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92 mark_object (rangetab_gap_array_at (rt->entries, i).val); |
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93 |
428 | 94 return Qnil; |
95 } | |
96 | |
97 static void | |
2286 | 98 print_range_table (Lisp_Object obj, Lisp_Object printcharfun, |
99 int UNUSED (escapeflag)) | |
428 | 100 { |
440 | 101 Lisp_Range_Table *rt = XRANGE_TABLE (obj); |
428 | 102 int i; |
103 | |
2421 | 104 if (print_readably) |
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105 write_fmt_string_lisp (printcharfun, "#s(range-table :type %s :data (", |
2421 | 106 1, range_table_type_to_symbol (rt->type)); |
107 else | |
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108 write_ascstring (printcharfun, "#<range-table "); |
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109 for (i = 0; i < gap_array_length (rt->entries); i++) |
428 | 110 { |
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111 struct range_table_entry rte = rangetab_gap_array_at (rt->entries, i); |
2421 | 112 int so, ec; |
428 | 113 if (i > 0) |
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114 write_ascstring (printcharfun, " "); |
2421 | 115 switch (rt->type) |
116 { | |
117 case RANGE_START_CLOSED_END_OPEN: so = 0, ec = 0; break; | |
118 case RANGE_START_CLOSED_END_CLOSED: so = 0, ec = 1; break; | |
119 case RANGE_START_OPEN_END_OPEN: so = 1, ec = 0; break; | |
120 case RANGE_START_OPEN_END_CLOSED: so = 1; ec = 1; break; | |
2500 | 121 default: ABORT (); so = 0, ec = 0; break; |
2421 | 122 } |
123 write_fmt_string (printcharfun, "%c%ld %ld%c ", | |
124 print_readably ? '(' : so ? '(' : '[', | |
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125 (long) (rte.first - so), |
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126 (long) (rte.last - ec), |
2421 | 127 print_readably ? ')' : ec ? ']' : ')' |
128 ); | |
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129 print_internal (rte.val, printcharfun, 1); |
428 | 130 } |
2421 | 131 if (print_readably) |
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132 write_ascstring (printcharfun, "))"); |
2421 | 133 else |
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134 write_fmt_string (printcharfun, " 0x%x>", LISP_OBJECT_UID (obj)); |
428 | 135 } |
136 | |
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137 static void |
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138 range_table_print_preprocess (Lisp_Object object, |
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139 Lisp_Object print_number_table, |
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140 Elemcount *seen_object_count) |
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141 { |
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142 Lisp_Range_Table *rt = XRANGE_TABLE (object); |
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143 Elemcount ii; |
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144 |
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145 for (ii = 0; ii < gap_array_length (rt->entries); ii++) |
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146 { |
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147 struct range_table_entry *entry |
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148 = gap_array_atp (rt->entries, ii, struct range_table_entry); |
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149 PRINT_PREPROCESS (entry->val, print_number_table, seen_object_count); |
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150 } |
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151 } |
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152 |
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153 static void |
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154 range_table_nsubst_structures_descend (Lisp_Object new_, Lisp_Object old, |
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155 Lisp_Object object, |
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156 Lisp_Object number_table, |
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157 Boolint test_not_unboundp) |
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158 { |
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159 Lisp_Range_Table *rt = XRANGE_TABLE (object); |
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160 Elemcount ii; |
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161 |
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162 /* We don't have to worry about the range table START and END values if |
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163 we're limiting nsubst_descend to the Lisp reader; it's a similar case |
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164 to the hash table test. */ |
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165 for (ii = 0; ii < gap_array_length (rt->entries); ii++) |
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166 { |
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167 struct range_table_entry *entry |
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168 = gap_array_atp (rt->entries, ii, struct range_table_entry); |
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169 |
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170 if (EQ (old, entry->val) == test_not_unboundp) |
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171 { |
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172 entry->val = new_; |
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173 } |
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174 else if (LRECORDP (entry->val) && |
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175 HAS_OBJECT_METH_P (entry->val, nsubst_structures_descend)) |
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176 { |
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177 nsubst_structures_descend (new_, old, entry->val, number_table, |
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178 test_not_unboundp); |
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179 } |
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180 } |
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181 } |
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182 |
428 | 183 static int |
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184 range_table_equal (Lisp_Object obj1, Lisp_Object obj2, int depth, int foldcase) |
428 | 185 { |
440 | 186 Lisp_Range_Table *rt1 = XRANGE_TABLE (obj1); |
187 Lisp_Range_Table *rt2 = XRANGE_TABLE (obj2); | |
428 | 188 int i; |
189 | |
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190 if (gap_array_length (rt1->entries) != gap_array_length (rt2->entries)) |
428 | 191 return 0; |
192 | |
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193 for (i = 0; i < gap_array_length (rt1->entries); i++) |
428 | 194 { |
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195 struct range_table_entry *rte1 = |
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196 rangetab_gap_array_atp (rt1->entries, i); |
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197 struct range_table_entry *rte2 = |
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198 rangetab_gap_array_atp (rt2->entries, i); |
428 | 199 |
200 if (rte1->first != rte2->first | |
201 || rte1->last != rte2->last | |
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202 || !internal_equal_0 (rte1->val, rte2->val, depth + 1, foldcase)) |
428 | 203 return 0; |
204 } | |
205 | |
206 return 1; | |
207 } | |
208 | |
2515 | 209 static Hashcode |
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210 range_table_entry_hash (struct range_table_entry *rte, int depth, |
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211 Boolint equalp) |
428 | 212 { |
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213 return HASH3 (rte->first, rte->last, |
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214 internal_hash (rte->val, depth + 1, equalp)); |
428 | 215 } |
216 | |
2515 | 217 static Hashcode |
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218 range_table_hash (Lisp_Object obj, int depth, Boolint equalp) |
428 | 219 { |
440 | 220 Lisp_Range_Table *rt = XRANGE_TABLE (obj); |
428 | 221 int i; |
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222 int size = gap_array_length (rt->entries); |
2515 | 223 Hashcode hash = size; |
428 | 224 |
225 /* approach based on internal_array_hash(). */ | |
226 if (size <= 5) | |
227 { | |
228 for (i = 0; i < size; i++) | |
229 hash = HASH2 (hash, | |
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230 range_table_entry_hash |
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231 (rangetab_gap_array_atp (rt->entries, i), depth, equalp)); |
428 | 232 return hash; |
233 } | |
234 | |
235 /* just pick five elements scattered throughout the array. | |
236 A slightly better approach would be to offset by some | |
237 noise factor from the points chosen below. */ | |
238 for (i = 0; i < 5; i++) | |
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239 hash = HASH2 (hash, |
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240 range_table_entry_hash |
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241 (rangetab_gap_array_atp (rt->entries, i*size/5), |
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242 depth, equalp)); |
428 | 243 return hash; |
244 } | |
245 | |
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246 #ifndef NEW_GC |
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247 |
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248 /* #### This leaks memory under NEW_GC. To fix this, convert to Lisp object |
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249 gap array. */ |
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250 |
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251 static void |
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252 finalize_range_table (Lisp_Object obj) |
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253 { |
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254 Lisp_Range_Table *rt = XRANGE_TABLE (obj); |
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255 if (rt->entries) |
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256 { |
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257 if (!DUMPEDP (rt->entries)) |
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258 free_gap_array (rt->entries); |
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259 rt->entries = 0; |
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260 } |
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261 } |
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262 |
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263 #endif /* not NEW_GC */ |
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264 |
1204 | 265 static const struct memory_description rte_description_1[] = { |
440 | 266 { XD_LISP_OBJECT, offsetof (range_table_entry, val) }, |
428 | 267 { XD_END } |
268 }; | |
269 | |
1204 | 270 static const struct sized_memory_description rte_description = { |
440 | 271 sizeof (range_table_entry), |
428 | 272 rte_description_1 |
273 }; | |
274 | |
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275 static const struct memory_description rtega_description_1[] = { |
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276 XD_GAP_ARRAY_DESC (&rte_description), |
428 | 277 { XD_END } |
278 }; | |
279 | |
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280 static const struct sized_memory_description rtega_description = { |
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281 0, rtega_description_1 |
428 | 282 }; |
283 | |
1204 | 284 static const struct memory_description range_table_description[] = { |
2551 | 285 { XD_BLOCK_PTR, offsetof (Lisp_Range_Table, entries), 1, |
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286 { &rtega_description } }, |
428 | 287 { XD_END } |
288 }; | |
289 | |
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290 DEFINE_DUMPABLE_LISP_OBJECT ("range-table", range_table, |
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291 mark_range_table, print_range_table, |
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292 IF_OLD_GC (finalize_range_table), |
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293 range_table_equal, range_table_hash, |
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294 range_table_description, |
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295 Lisp_Range_Table); |
428 | 296 |
297 /************************************************************************/ | |
298 /* Range table operations */ | |
299 /************************************************************************/ | |
300 | |
800 | 301 #ifdef ERROR_CHECK_STRUCTURES |
428 | 302 |
303 static void | |
440 | 304 verify_range_table (Lisp_Range_Table *rt) |
428 | 305 { |
306 int i; | |
307 | |
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308 for (i = 0; i < gap_array_length (rt->entries); i++) |
428 | 309 { |
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310 struct range_table_entry *rte = rangetab_gap_array_atp (rt->entries, i); |
428 | 311 assert (rte->last >= rte->first); |
312 if (i > 0) | |
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313 assert (rangetab_gap_array_at (rt->entries, i - 1).last <= rte->first); |
428 | 314 } |
315 } | |
316 | |
317 #else | |
318 | |
319 #define verify_range_table(rt) | |
320 | |
321 #endif | |
322 | |
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323 /* Locate the range table entry corresponding to the value POS, and return |
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324 it. If found, FOUNDP is set to 1 and the return value specifies an entry |
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325 that encloses POS. Otherwise, FOUNDP is set to 0 and the return value |
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326 specifies where an entry that encloses POS would be inserted. */ |
428 | 327 |
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328 static Elemcount |
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329 get_range_table_pos (Elemcount pos, Elemcount nentries, |
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330 struct range_table_entry *tab, |
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331 Elemcount gappos, Elemcount gapsize, |
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332 int *foundp) |
428 | 333 { |
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334 Elemcount left = 0, right = nentries; |
428 | 335 |
336 /* binary search for the entry. Based on similar code in | |
337 extent_list_locate(). */ | |
338 while (left != right) | |
339 { | |
340 /* RIGHT might not point to a valid entry (i.e. it's at the end | |
341 of the list), so NEWPOS must round down. */ | |
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342 Elemcount newpos = (left + right) >> 1; |
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343 struct range_table_entry *entry = |
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344 tab + GAP_ARRAY_ARRAY_TO_MEMORY_POS_1 (newpos, gappos, gapsize); |
2421 | 345 if (pos >= entry->last) |
346 left = newpos + 1; | |
428 | 347 else if (pos < entry->first) |
348 right = newpos; | |
349 else | |
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350 { |
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351 *foundp = 1; |
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352 return newpos; |
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353 } |
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354 } |
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355 |
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356 *foundp = 0; |
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357 return left; |
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358 } |
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359 |
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360 /* Look up in a range table without the gap array wrapper. |
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361 Used also by the unified range table format. */ |
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362 |
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363 static Lisp_Object |
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364 get_range_table (Elemcount pos, Elemcount nentries, |
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365 struct range_table_entry *tab, |
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366 Elemcount gappos, Elemcount gapsize, |
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367 Lisp_Object default_) |
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368 { |
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369 int foundp; |
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370 Elemcount entrypos = get_range_table_pos (pos, nentries, tab, gappos, |
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371 gapsize, &foundp); |
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372 if (foundp) |
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373 { |
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374 struct range_table_entry *entry = |
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375 tab + GAP_ARRAY_ARRAY_TO_MEMORY_POS_1 (entrypos, gappos, gapsize); |
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376 return entry->val; |
428 | 377 } |
378 | |
379 return default_; | |
380 } | |
381 | |
382 DEFUN ("range-table-p", Frange_table_p, 1, 1, 0, /* | |
383 Return non-nil if OBJECT is a range table. | |
384 */ | |
385 (object)) | |
386 { | |
387 return RANGE_TABLEP (object) ? Qt : Qnil; | |
388 } | |
389 | |
2421 | 390 DEFUN ("range-table-type", Frange_table_type, 1, 1, 0, /* |
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391 Return the type of RANGE-TABLE. |
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392 |
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393 This will be a symbol describing how ranges in RANGE-TABLE function at their |
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394 ends; see `make-range-table'. |
2421 | 395 */ |
396 (range_table)) | |
397 { | |
398 CHECK_RANGE_TABLE (range_table); | |
399 return range_table_type_to_symbol (XRANGE_TABLE (range_table)->type); | |
400 } | |
401 | |
402 DEFUN ("make-range-table", Fmake_range_table, 0, 1, 0, /* | |
428 | 403 Return a new, empty range table. |
404 You can manipulate it using `put-range-table', `get-range-table', | |
405 `remove-range-table', and `clear-range-table'. | |
2421 | 406 Range tables allow you to efficiently set values for ranges of integers. |
407 | |
408 TYPE is a symbol indicating how ranges are assumed to function at their | |
409 ends. It can be one of | |
410 | |
411 SYMBOL RANGE-START RANGE-END | |
412 ------ ----------- --------- | |
413 `start-closed-end-open' (the default) closed open | |
414 `start-closed-end-closed' closed closed | |
415 `start-open-end-open' open open | |
416 `start-open-end-closed' open closed | |
417 | |
418 A `closed' endpoint of a range means that the number at that end is included | |
419 in the range. For an `open' endpoint, the number would not be included. | |
420 | |
421 For example, a closed-open range from 5 to 20 would be indicated as [5, | |
422 20) where a bracket indicates a closed end and a parenthesis an open end, | |
423 and would mean `all the numbers between 5 and 20', including 5 but not 20. | |
424 This seems a little strange at first but is in fact extremely common in | |
425 the outside world as well as in computers and makes things work sensibly. | |
426 For example, if I say "there are seven days between today and next week | |
427 today", I'm including today but not next week today; if I included both, | |
428 there would be eight days. Similarly, there are 15 (= 20 - 5) elements in | |
429 the range [5, 20), but 16 in the range [5, 20]. | |
428 | 430 */ |
2421 | 431 (type)) |
428 | 432 { |
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433 Lisp_Object obj = ALLOC_NORMAL_LISP_OBJECT (range_table); |
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434 Lisp_Range_Table *rt = XRANGE_TABLE (obj); |
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435 rt->entries = make_gap_array (sizeof (struct range_table_entry), 0); |
2421 | 436 rt->type = range_table_symbol_to_type (type); |
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437 return obj; |
428 | 438 } |
439 | |
440 DEFUN ("copy-range-table", Fcopy_range_table, 1, 1, 0, /* | |
444 | 441 Return a new range table which is a copy of RANGE-TABLE. |
442 It will contain the same values for the same ranges as RANGE-TABLE. | |
443 The values will not themselves be copied. | |
428 | 444 */ |
444 | 445 (range_table)) |
428 | 446 { |
440 | 447 Lisp_Range_Table *rt, *rtnew; |
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448 Lisp_Object obj; |
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449 Elemcount i; |
428 | 450 |
444 | 451 CHECK_RANGE_TABLE (range_table); |
452 rt = XRANGE_TABLE (range_table); | |
428 | 453 |
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454 obj = ALLOC_NORMAL_LISP_OBJECT (range_table); |
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455 rtnew = XRANGE_TABLE (obj); |
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456 rtnew->entries = make_gap_array (sizeof (struct range_table_entry), 0); |
2421 | 457 rtnew->type = rt->type; |
428 | 458 |
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459 for (i = 0; i < gap_array_length (rt->entries); i++) |
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460 rtnew->entries = |
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461 gap_array_insert_els (rtnew->entries, i, |
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462 rangetab_gap_array_atp (rt->entries, i), 1); |
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463 return obj; |
428 | 464 } |
465 | |
466 DEFUN ("get-range-table", Fget_range_table, 2, 3, 0, /* | |
444 | 467 Find value for position POS in RANGE-TABLE. |
428 | 468 If there is no corresponding value, return DEFAULT (defaults to nil). |
469 */ | |
444 | 470 (pos, range_table, default_)) |
428 | 471 { |
440 | 472 Lisp_Range_Table *rt; |
428 | 473 |
444 | 474 CHECK_RANGE_TABLE (range_table); |
475 rt = XRANGE_TABLE (range_table); | |
428 | 476 |
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477 CHECK_FIXNUM_COERCE_CHAR (pos); |
428 | 478 |
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479 return get_range_table (XFIXNUM (pos), gap_array_length (rt->entries), |
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480 gap_array_begin (rt->entries, |
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481 struct range_table_entry), |
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482 gap_array_gappos (rt->entries), |
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483 gap_array_gapsize (rt->entries), |
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484 default_); |
428 | 485 } |
486 | |
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487 static void |
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488 external_to_internal_adjust_ends (enum range_table_type type, |
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489 EMACS_INT *first, EMACS_INT *last) |
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490 { |
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491 /* Fix up the numbers in accordance with the open/closedness to make |
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492 them behave like default open/closed. */ |
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493 switch (type) |
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494 { |
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495 case RANGE_START_CLOSED_END_OPEN: break; |
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496 case RANGE_START_CLOSED_END_CLOSED: (*last)++; break; |
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497 case RANGE_START_OPEN_END_OPEN: (*first)++; break; |
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498 case RANGE_START_OPEN_END_CLOSED: (*first)++, (*last)++; break; |
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499 } |
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500 } |
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501 |
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502 static void |
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503 internal_to_external_adjust_ends (enum range_table_type type, |
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504 EMACS_INT *first, EMACS_INT *last) |
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505 { |
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506 /* Reverse the changes made in external_to_internal_adjust_ends(). |
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507 */ |
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508 switch (type) |
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509 { |
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510 case RANGE_START_CLOSED_END_OPEN: break; |
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511 case RANGE_START_CLOSED_END_CLOSED: (*last)--; break; |
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512 case RANGE_START_OPEN_END_OPEN: (*first)--; break; |
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513 case RANGE_START_OPEN_END_CLOSED: (*first)--, (*last)--; break; |
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514 } |
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515 } |
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516 |
428 | 517 void |
518 put_range_table (Lisp_Object table, EMACS_INT first, | |
519 EMACS_INT last, Lisp_Object val) | |
520 { | |
521 int i; | |
522 int insert_me_here = -1; | |
440 | 523 Lisp_Range_Table *rt = XRANGE_TABLE (table); |
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524 int foundp; |
428 | 525 |
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526 external_to_internal_adjust_ends (rt->type, &first, &last); |
2421 | 527 if (first == last) |
528 return; | |
529 if (first > last) | |
530 /* This will happen if originally first == last and both ends are | |
531 open. #### Should we signal an error? */ | |
532 return; | |
533 | |
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534 if (DUMPEDP (rt->entries)) |
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535 rt->entries = gap_array_clone (rt->entries); |
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536 |
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537 i = get_range_table_pos (first, gap_array_length (rt->entries), |
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538 gap_array_begin (rt->entries, |
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539 struct range_table_entry), |
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540 gap_array_gappos (rt->entries), |
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541 gap_array_gapsize (rt->entries), &foundp); |
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542 |
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543 #ifdef ERROR_CHECK_TYPES |
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544 if (foundp) |
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545 { |
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546 if (i < gap_array_length (rt->entries)) |
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547 { |
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548 struct range_table_entry *entry = |
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549 rangetab_gap_array_atp (rt->entries, i); |
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550 assert (first >= entry->first && first < entry->last); |
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551 } |
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552 } |
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553 else |
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554 { |
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555 if (i < gap_array_length (rt->entries)) |
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556 { |
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557 struct range_table_entry *entry = |
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558 rangetab_gap_array_atp (rt->entries, i); |
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559 assert (first < entry->first); |
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560 } |
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561 if (i > 0) |
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562 { |
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563 struct range_table_entry *entry = |
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564 rangetab_gap_array_atp (rt->entries, i - 1); |
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565 assert (first >= entry->last); |
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566 } |
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567 } |
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568 #endif /* ERROR_CHECK_TYPES */ |
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569 |
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570 /* If the beginning of the new range isn't within any existing range, |
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571 it might still be just grazing the end of an end-open range (remember, |
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572 internally all ranges are start-close end-open); so back up one |
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573 so we consider this range. */ |
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574 if (!foundp && i > 0) |
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575 i--; |
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576 |
428 | 577 /* Now insert in the proper place. This gets tricky because |
578 we may be overlapping one or more existing ranges and need | |
579 to fix them up. */ | |
580 | |
581 /* First delete all sections of any existing ranges that overlap | |
582 the new range. */ | |
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583 for (; i < gap_array_length (rt->entries); i++) |
428 | 584 { |
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585 struct range_table_entry *entry = |
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586 rangetab_gap_array_atp (rt->entries, i); |
428 | 587 /* We insert before the first range that begins at or after the |
588 new range. */ | |
589 if (entry->first >= first && insert_me_here < 0) | |
590 insert_me_here = i; | |
591 if (entry->last < first) | |
592 /* completely before the new range. */ | |
593 continue; | |
594 if (entry->first > last) | |
595 /* completely after the new range. No more possibilities of | |
596 finding overlapping ranges. */ | |
597 break; | |
2421 | 598 /* At this point the existing ENTRY overlaps or touches the new one. */ |
428 | 599 if (entry->first < first && entry->last <= last) |
600 { | |
601 /* looks like: | |
602 | |
2421 | 603 [ NEW ) |
604 [ EXISTING ) | |
605 | |
606 or | |
607 | |
608 [ NEW ) | |
609 [ EXISTING ) | |
428 | 610 |
611 */ | |
612 /* truncate the end off of it. */ | |
2421 | 613 entry->last = first; |
428 | 614 } |
615 else if (entry->first < first && entry->last > last) | |
616 /* looks like: | |
617 | |
2421 | 618 [ NEW ) |
619 [ EXISTING ) | |
428 | 620 |
621 */ | |
622 /* need to split this one in two. */ | |
623 { | |
624 struct range_table_entry insert_me_too; | |
625 | |
2421 | 626 insert_me_too.first = last; |
428 | 627 insert_me_too.last = entry->last; |
628 insert_me_too.val = entry->val; | |
2421 | 629 entry->last = first; |
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630 rt->entries = |
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631 gap_array_insert_els (rt->entries, i + 1, &insert_me_too, 1); |
428 | 632 } |
2421 | 633 else if (entry->last >= last) |
428 | 634 { |
635 /* looks like: | |
636 | |
2421 | 637 [ NEW ) |
638 [ EXISTING ) | |
639 | |
640 or | |
641 | |
642 [ NEW ) | |
643 [ EXISTING ) | |
428 | 644 |
645 */ | |
646 /* truncate the start off of it. */ | |
2421 | 647 entry->first = last; |
428 | 648 } |
649 else | |
650 { | |
651 /* existing is entirely within new. */ | |
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652 gap_array_delete_els (rt->entries, i, 1); |
428 | 653 i--; /* back up since everything shifted one to the left. */ |
654 } | |
655 } | |
656 | |
657 /* Someone asked us to delete the range, not insert it. */ | |
658 if (UNBOUNDP (val)) | |
659 return; | |
660 | |
661 /* Now insert the new entry, maybe at the end. */ | |
662 | |
663 if (insert_me_here < 0) | |
664 insert_me_here = i; | |
665 | |
666 { | |
667 struct range_table_entry insert_me; | |
668 | |
669 insert_me.first = first; | |
670 insert_me.last = last; | |
671 insert_me.val = val; | |
672 | |
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673 rt->entries = |
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674 gap_array_insert_els (rt->entries, insert_me_here, &insert_me, 1); |
428 | 675 } |
676 | |
677 /* Now see if we can combine this entry with adjacent ones just | |
678 before or after. */ | |
679 | |
680 if (insert_me_here > 0) | |
681 { | |
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682 struct range_table_entry *entry = |
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683 rangetab_gap_array_atp (rt->entries, insert_me_here - 1); |
2421 | 684 if (EQ (val, entry->val) && entry->last == first) |
428 | 685 { |
686 entry->last = last; | |
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687 gap_array_delete_els (rt->entries, insert_me_here, 1); |
428 | 688 insert_me_here--; |
689 /* We have morphed into a larger range. Update our records | |
690 in case we also combine with the one after. */ | |
691 first = entry->first; | |
692 } | |
693 } | |
694 | |
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695 if (insert_me_here < gap_array_length (rt->entries) - 1) |
428 | 696 { |
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697 struct range_table_entry *entry = |
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698 rangetab_gap_array_atp (rt->entries, insert_me_here + 1); |
2421 | 699 if (EQ (val, entry->val) && entry->first == last) |
428 | 700 { |
701 entry->first = first; | |
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702 gap_array_delete_els (rt->entries, insert_me_here, 1); |
428 | 703 } |
704 } | |
705 } | |
706 | |
707 DEFUN ("put-range-table", Fput_range_table, 4, 4, 0, /* | |
2421 | 708 Set the value for range START .. END to be VALUE in RANGE-TABLE. |
428 | 709 */ |
444 | 710 (start, end, value, range_table)) |
428 | 711 { |
712 EMACS_INT first, last; | |
713 | |
444 | 714 CHECK_RANGE_TABLE (range_table); |
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715 CHECK_FIXNUM_COERCE_CHAR (start); |
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716 first = XFIXNUM (start); |
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717 CHECK_FIXNUM_COERCE_CHAR (end); |
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718 last = XFIXNUM (end); |
428 | 719 if (first > last) |
563 | 720 invalid_argument_2 ("start must be <= end", start, end); |
428 | 721 |
444 | 722 put_range_table (range_table, first, last, value); |
723 verify_range_table (XRANGE_TABLE (range_table)); | |
428 | 724 return Qnil; |
725 } | |
726 | |
727 DEFUN ("remove-range-table", Fremove_range_table, 3, 3, 0, /* | |
2421 | 728 Remove the value for range START .. END in RANGE-TABLE. |
428 | 729 */ |
444 | 730 (start, end, range_table)) |
428 | 731 { |
444 | 732 return Fput_range_table (start, end, Qunbound, range_table); |
428 | 733 } |
734 | |
735 DEFUN ("clear-range-table", Fclear_range_table, 1, 1, 0, /* | |
444 | 736 Flush RANGE-TABLE. |
428 | 737 */ |
444 | 738 (range_table)) |
428 | 739 { |
444 | 740 CHECK_RANGE_TABLE (range_table); |
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741 gap_array_delete_all_els (XRANGE_TABLE (range_table)->entries); |
428 | 742 return Qnil; |
743 } | |
744 | |
745 DEFUN ("map-range-table", Fmap_range_table, 2, 2, 0, /* | |
444 | 746 Map FUNCTION over entries in RANGE-TABLE, calling it with three args, |
428 | 747 the beginning and end of the range and the corresponding value. |
442 | 748 |
749 Results are guaranteed to be correct (i.e. each entry processed | |
750 exactly once) if FUNCTION modifies or deletes the current entry | |
444 | 751 \(i.e. passes the current range to `put-range-table' or |
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752 `remove-range-table'). If FUNCTION modifies or deletes any other entry, |
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753 this guarantee doesn't hold. |
428 | 754 */ |
444 | 755 (function, range_table)) |
428 | 756 { |
442 | 757 Lisp_Range_Table *rt; |
758 int i; | |
759 | |
444 | 760 CHECK_RANGE_TABLE (range_table); |
442 | 761 CHECK_FUNCTION (function); |
762 | |
444 | 763 rt = XRANGE_TABLE (range_table); |
442 | 764 |
765 /* Do not "optimize" by pulling out the length computation below! | |
766 FUNCTION may have changed the table. */ | |
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767 for (i = 0; i < gap_array_length (rt->entries); i++) |
442 | 768 { |
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769 struct range_table_entry entry = |
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770 rangetab_gap_array_at (rt->entries, i); |
442 | 771 EMACS_INT first, last; |
772 Lisp_Object args[4]; | |
773 int oldlen; | |
774 | |
775 again: | |
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776 first = entry.first; |
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777 last = entry.last; |
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778 oldlen = gap_array_length (rt->entries); |
442 | 779 args[0] = function; |
2952 | 780 /* Fix up the numbers in accordance with the open/closedness of the |
781 table. */ | |
782 { | |
783 EMACS_INT premier = first, dernier = last; | |
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784 internal_to_external_adjust_ends (rt->type, &premier, &dernier); |
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785 args[1] = make_fixnum (premier); |
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786 args[2] = make_fixnum (dernier); |
2952 | 787 } |
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788 args[3] = entry.val; |
442 | 789 Ffuncall (countof (args), args); |
790 /* Has FUNCTION removed the entry? */ | |
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791 if (oldlen > gap_array_length (rt->entries) |
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792 && i < gap_array_length (rt->entries) |
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793 && (first != entry.first || last != entry.last)) |
442 | 794 goto again; |
795 } | |
796 | |
428 | 797 return Qnil; |
798 } | |
799 | |
800 | |
801 /************************************************************************/ | |
802 /* Range table read syntax */ | |
803 /************************************************************************/ | |
804 | |
805 static int | |
2421 | 806 rangetab_type_validate (Lisp_Object UNUSED (keyword), Lisp_Object value, |
807 Error_Behavior UNUSED (errb)) | |
808 { | |
809 /* #### should deal with ERRB */ | |
810 range_table_symbol_to_type (value); | |
811 return 1; | |
812 } | |
813 | |
814 static int | |
2286 | 815 rangetab_data_validate (Lisp_Object UNUSED (keyword), Lisp_Object value, |
816 Error_Behavior UNUSED (errb)) | |
428 | 817 { |
2367 | 818 /* #### should deal with ERRB */ |
819 EXTERNAL_PROPERTY_LIST_LOOP_3 (range, data, value) | |
428 | 820 { |
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821 if (!FIXNUMP (range) && !CHARP (range) |
428 | 822 && !(CONSP (range) && CONSP (XCDR (range)) |
823 && NILP (XCDR (XCDR (range))) | |
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824 && (FIXNUMP (XCAR (range)) || CHARP (XCAR (range))) |
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825 && (FIXNUMP (XCAR (XCDR (range))) || CHARP (XCAR (XCDR (range)))))) |
563 | 826 sferror ("Invalid range format", range); |
428 | 827 } |
828 | |
829 return 1; | |
830 } | |
831 | |
832 static Lisp_Object | |
2421 | 833 rangetab_instantiate (Lisp_Object plist) |
428 | 834 { |
2425 | 835 Lisp_Object data = Qnil, type = Qnil, rangetab; |
428 | 836 |
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837 if (KEYWORDP (Fcar (plist))) |
428 | 838 { |
5222
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839 PROPERTY_LIST_LOOP_3 (key, value, plist) |
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840 { |
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841 if (EQ (key, Q_type)) type = value; |
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842 else if (EQ (key, Q_data)) data = value; |
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843 else if (!KEYWORDP (key)) |
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844 signal_error |
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845 (Qinvalid_read_syntax, |
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846 "can't mix keyword and non-keyword structure syntax", |
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847 key); |
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848 else |
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849 ABORT (); |
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850 } |
2421 | 851 } |
5222
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852 #ifdef NEED_TO_HANDLE_21_4_CODE |
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853 else |
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854 { |
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855 PROPERTY_LIST_LOOP_3 (key, value, plist) |
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856 { |
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857 if (EQ (key, Qtype)) type = value; |
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858 else if (EQ (key, Qdata)) data = value; |
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859 else if (KEYWORDP (key)) |
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860 signal_error |
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861 (Qinvalid_read_syntax, |
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862 "can't mix keyword and non-keyword structure syntax", |
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863 key); |
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864 else |
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865 ABORT (); |
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866 } |
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867 } |
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868 #endif /* NEED_TO_HANDLE_21_4_CODE */ |
2421 | 869 |
2425 | 870 rangetab = Fmake_range_table (type); |
428 | 871 |
2421 | 872 { |
873 PROPERTY_LIST_LOOP_3 (range, val, data) | |
874 { | |
875 if (CONSP (range)) | |
876 Fput_range_table (Fcar (range), Fcar (Fcdr (range)), val, | |
877 rangetab); | |
878 else | |
879 Fput_range_table (range, range, val, rangetab); | |
880 } | |
881 } | |
428 | 882 |
883 return rangetab; | |
884 } | |
885 | |
886 | |
887 /************************************************************************/ | |
888 /* Unified range tables */ | |
889 /************************************************************************/ | |
890 | |
891 /* A "unified range table" is a format for storing range tables | |
892 as contiguous blocks of memory. This is used by the regexp | |
893 code, which needs to use range tables to properly handle [] | |
894 constructs in the presence of extended characters but wants to | |
895 store an entire compiled pattern as a contiguous block of memory. | |
896 | |
897 Unified range tables are designed so that they can be placed | |
898 at an arbitrary (possibly mis-aligned) place in memory. | |
899 (Dealing with alignment is a pain in the ass.) | |
900 | |
901 WARNING: No provisions for garbage collection are currently made. | |
902 This means that there must not be any Lisp objects in a unified | |
903 range table that need to be marked for garbage collection. | |
904 Good candidates for objects that can go into a range table are | |
905 | |
906 -- numbers and characters (do not need to be marked) | |
907 -- nil, t (marked elsewhere) | |
908 -- charsets and coding systems (automatically marked because | |
909 they are in a marked list, | |
910 and can't be removed) | |
911 | |
912 Good but slightly less so: | |
913 | |
914 -- symbols (could be uninterned, but that is not likely) | |
915 | |
916 Somewhat less good: | |
917 | |
918 -- buffers, frames, devices (could get deleted) | |
919 | |
920 | |
921 It is expected that you work with range tables in the normal | |
922 format and then convert to unified format when you are done | |
923 making modifications. As such, no functions are provided | |
924 for modifying a unified range table. The only operations | |
925 you can do to unified range tables are | |
926 | |
927 -- look up a value | |
928 -- retrieve all the ranges in an iterative fashion | |
929 | |
930 */ | |
931 | |
932 /* The format of a unified range table is as follows: | |
933 | |
934 -- The first byte contains the number of bytes to skip to find the | |
935 actual start of the table. This deals with alignment constraints, | |
936 since the table might want to go at any arbitrary place in memory. | |
937 -- The next three bytes contain the number of bytes to skip (from the | |
938 *first* byte) to find the stuff after the table. It's stored in | |
939 little-endian format because that's how God intended things. We don't | |
940 necessarily start the stuff at the very end of the table because | |
941 we want to have at least ALIGNOF (EMACS_INT) extra space in case | |
942 we have to move the range table around. (It appears that some | |
943 architectures don't maintain alignment when reallocing.) | |
944 -- At the prescribed offset is a struct unified_range_table, containing | |
945 some number of `struct range_table_entry' entries. */ | |
946 | |
947 struct unified_range_table | |
948 { | |
949 int nentries; | |
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950 enum range_table_type type; |
428 | 951 struct range_table_entry first; |
952 }; | |
953 | |
954 /* Return size in bytes needed to store the data in a range table. */ | |
955 | |
956 int | |
957 unified_range_table_bytes_needed (Lisp_Object rangetab) | |
958 { | |
959 return (sizeof (struct range_table_entry) * | |
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960 (gap_array_length (XRANGE_TABLE (rangetab)->entries) - 1) + |
428 | 961 sizeof (struct unified_range_table) + |
962 /* ALIGNOF a struct may be too big. */ | |
963 /* We have four bytes for the size numbers, and an extra | |
964 four or eight bytes for making sure we get the alignment | |
965 OK. */ | |
966 ALIGNOF (EMACS_INT) + 4); | |
967 } | |
968 | |
969 /* Convert a range table into unified format and store in DEST, | |
970 which must be able to hold the number of bytes returned by | |
971 range_table_bytes_needed(). */ | |
972 | |
973 void | |
974 unified_range_table_copy_data (Lisp_Object rangetab, void *dest) | |
975 { | |
976 /* We cast to the above structure rather than just casting to | |
977 char * and adding sizeof(int), because that will lead to | |
978 mis-aligned data on the Alpha machines. */ | |
979 struct unified_range_table *un; | |
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980 Gap_Array *rtega = XRANGE_TABLE (rangetab)->entries; |
428 | 981 int total_needed = unified_range_table_bytes_needed (rangetab); |
826 | 982 void *new_dest = ALIGN_PTR ((char *) dest + 4, EMACS_INT); |
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983 Elemcount i; |
428 | 984 |
985 * (char *) dest = (char) ((char *) new_dest - (char *) dest); | |
986 * ((unsigned char *) dest + 1) = total_needed & 0xFF; | |
987 total_needed >>= 8; | |
988 * ((unsigned char *) dest + 2) = total_needed & 0xFF; | |
989 total_needed >>= 8; | |
990 * ((unsigned char *) dest + 3) = total_needed & 0xFF; | |
991 un = (struct unified_range_table *) new_dest; | |
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992 un->nentries = gap_array_length (rtega); |
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993 un->type = XRANGE_TABLE (rangetab)->type; |
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994 for (i = 0; i < gap_array_length (rtega); i++) |
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995 (&un->first)[i] = rangetab_gap_array_at (rtega, i); |
428 | 996 } |
997 | |
998 /* Return number of bytes actually used by a unified range table. */ | |
999 | |
1000 int | |
1001 unified_range_table_bytes_used (void *unrangetab) | |
1002 { | |
1003 return ((* ((unsigned char *) unrangetab + 1)) | |
1004 + ((* ((unsigned char *) unrangetab + 2)) << 8) | |
1005 + ((* ((unsigned char *) unrangetab + 3)) << 16)); | |
1006 } | |
1007 | |
1008 /* Make sure the table is aligned, and move it around if it's not. */ | |
1009 static void | |
1010 align_the_damn_table (void *unrangetab) | |
1011 { | |
1012 void *cur_dest = (char *) unrangetab + * (char *) unrangetab; | |
826 | 1013 if (cur_dest != ALIGN_PTR (cur_dest, EMACS_INT)) |
428 | 1014 { |
1015 int count = (unified_range_table_bytes_used (unrangetab) - 4 | |
1016 - ALIGNOF (EMACS_INT)); | |
1017 /* Find the proper location, just like above. */ | |
826 | 1018 void *new_dest = ALIGN_PTR ((char *) unrangetab + 4, EMACS_INT); |
428 | 1019 /* memmove() works in the presence of overlapping data. */ |
1020 memmove (new_dest, cur_dest, count); | |
1021 * (char *) unrangetab = (char) ((char *) new_dest - (char *) unrangetab); | |
1022 } | |
1023 } | |
1024 | |
1025 /* Look up a value in a unified range table. */ | |
1026 | |
1027 Lisp_Object | |
1028 unified_range_table_lookup (void *unrangetab, EMACS_INT pos, | |
1029 Lisp_Object default_) | |
1030 { | |
1031 void *new_dest; | |
1032 struct unified_range_table *un; | |
1033 | |
1034 align_the_damn_table (unrangetab); | |
1035 new_dest = (char *) unrangetab + * (char *) unrangetab; | |
1036 un = (struct unified_range_table *) new_dest; | |
1037 | |
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1038 return get_range_table (pos, un->nentries, &un->first, 0, 0, default_); |
428 | 1039 } |
1040 | |
1041 /* Return number of entries in a unified range table. */ | |
1042 | |
1043 int | |
1044 unified_range_table_nentries (void *unrangetab) | |
1045 { | |
1046 void *new_dest; | |
1047 struct unified_range_table *un; | |
1048 | |
1049 align_the_damn_table (unrangetab); | |
1050 new_dest = (char *) unrangetab + * (char *) unrangetab; | |
1051 un = (struct unified_range_table *) new_dest; | |
1052 return un->nentries; | |
1053 } | |
1054 | |
1055 /* Return the OFFSETth range (counting from 0) in UNRANGETAB. */ | |
1056 void | |
1057 unified_range_table_get_range (void *unrangetab, int offset, | |
1058 EMACS_INT *min, EMACS_INT *max, | |
1059 Lisp_Object *val) | |
1060 { | |
1061 void *new_dest; | |
1062 struct unified_range_table *un; | |
1063 struct range_table_entry *tab; | |
1064 | |
1065 align_the_damn_table (unrangetab); | |
1066 new_dest = (char *) unrangetab + * (char *) unrangetab; | |
1067 un = (struct unified_range_table *) new_dest; | |
1068 | |
1069 assert (offset >= 0 && offset < un->nentries); | |
1070 tab = (&un->first) + offset; | |
1071 *min = tab->first; | |
1072 *max = tab->last; | |
1073 *val = tab->val; | |
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1074 |
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1075 internal_to_external_adjust_ends (un->type, min, max); |
428 | 1076 } |
1077 | |
1078 | |
1079 /************************************************************************/ | |
1080 /* Initialization */ | |
1081 /************************************************************************/ | |
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1082 void |
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1083 rangetab_objects_create (void) |
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1084 { |
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1085 OBJECT_HAS_METHOD (range_table, print_preprocess); |
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1086 OBJECT_HAS_METHOD (range_table, nsubst_structures_descend); |
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1087 } |
428 | 1088 |
1089 void | |
1090 syms_of_rangetab (void) | |
1091 { | |
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1092 INIT_LISP_OBJECT (range_table); |
442 | 1093 |
563 | 1094 DEFSYMBOL_MULTIWORD_PREDICATE (Qrange_tablep); |
1095 DEFSYMBOL (Qrange_table); | |
428 | 1096 |
2421 | 1097 DEFSYMBOL (Qstart_closed_end_open); |
1098 DEFSYMBOL (Qstart_open_end_open); | |
1099 DEFSYMBOL (Qstart_closed_end_closed); | |
1100 DEFSYMBOL (Qstart_open_end_closed); | |
1101 | |
428 | 1102 DEFSUBR (Frange_table_p); |
2421 | 1103 DEFSUBR (Frange_table_type); |
428 | 1104 DEFSUBR (Fmake_range_table); |
1105 DEFSUBR (Fcopy_range_table); | |
1106 DEFSUBR (Fget_range_table); | |
1107 DEFSUBR (Fput_range_table); | |
1108 DEFSUBR (Fremove_range_table); | |
1109 DEFSUBR (Fclear_range_table); | |
1110 DEFSUBR (Fmap_range_table); | |
1111 } | |
1112 | |
1113 void | |
1114 structure_type_create_rangetab (void) | |
1115 { | |
1116 struct structure_type *st; | |
1117 | |
1118 st = define_structure_type (Qrange_table, 0, rangetab_instantiate); | |
1119 | |
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1120 define_structure_type_keyword (st, Q_data, rangetab_data_validate); |
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1121 define_structure_type_keyword (st, Q_type, rangetab_type_validate); |
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1122 #ifdef NEED_TO_HANDLE_21_4_CODE |
428 | 1123 define_structure_type_keyword (st, Qdata, rangetab_data_validate); |
2421 | 1124 define_structure_type_keyword (st, Qtype, rangetab_type_validate); |
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1125 #endif /* NEED_TO_HANDLE_21_4_CODE */ |
428 | 1126 } |