Commit | Line | Data |
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4a655e50 | 1 | /* Copyright (C) 1995,1996,1997,1999,2000,2001,2003, 2004, 2006, 2007, 2008, 2009, 2010, 2011 Free Software |
dd72382c | 2 | * Foundation, Inc. |
0f2d19dd | 3 | * |
73be1d9e | 4 | * This library is free software; you can redistribute it and/or |
53befeb7 NJ |
5 | * modify it under the terms of the GNU Lesser General Public License |
6 | * as published by the Free Software Foundation; either version 3 of | |
7 | * the License, or (at your option) any later version. | |
0f2d19dd | 8 | * |
53befeb7 NJ |
9 | * This library is distributed in the hope that it will be useful, but |
10 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
73be1d9e MV |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
12 | * Lesser General Public License for more details. | |
0f2d19dd | 13 | * |
73be1d9e MV |
14 | * You should have received a copy of the GNU Lesser General Public |
15 | * License along with this library; if not, write to the Free Software | |
53befeb7 NJ |
16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
17 | * 02110-1301 USA | |
73be1d9e | 18 | */ |
1bbd0b84 | 19 | |
1bbd0b84 | 20 | |
0f2d19dd JB |
21 | \f |
22 | ||
7337d56d LC |
23 | #ifdef HAVE_CONFIG_H |
24 | # include <config.h> | |
25 | #endif | |
26 | ||
0f2d19dd | 27 | #include <stdio.h> |
7337d56d LC |
28 | #include <ctype.h> |
29 | #include <string.h> | |
889975e5 MG |
30 | #include <unistd.h> |
31 | #include <unicase.h> | |
684d664e | 32 | #include <unictype.h> |
7337d56d | 33 | |
a0599745 | 34 | #include "libguile/_scm.h" |
0ba0b384 | 35 | #include "libguile/bytevectors.h" |
a0599745 MD |
36 | #include "libguile/chars.h" |
37 | #include "libguile/eval.h" | |
2fa901a5 | 38 | #include "libguile/arrays.h" |
cf396142 | 39 | #include "libguile/bitvectors.h" |
a0599745 MD |
40 | #include "libguile/keywords.h" |
41 | #include "libguile/alist.h" | |
42 | #include "libguile/srcprop.h" | |
43 | #include "libguile/hashtab.h" | |
44 | #include "libguile/hash.h" | |
45 | #include "libguile/ports.h" | |
49bb5bd3 | 46 | #include "libguile/fports.h" |
a0599745 MD |
47 | #include "libguile/root.h" |
48 | #include "libguile/strings.h" | |
ba1b2226 | 49 | #include "libguile/strports.h" |
a0599745 | 50 | #include "libguile/vectors.h" |
a0599745 | 51 | #include "libguile/validate.h" |
a4022e69 | 52 | #include "libguile/srfi-4.h" |
7337d56d | 53 | #include "libguile/srfi-13.h" |
ba1b2226 | 54 | |
a0599745 | 55 | #include "libguile/read.h" |
22fc179a HWN |
56 | #include "libguile/private-options.h" |
57 | ||
0f2d19dd JB |
58 | |
59 | \f | |
60 | ||
5bf6a6f0 | 61 | SCM_GLOBAL_SYMBOL (scm_sym_dot, "."); |
c7733771 | 62 | SCM_SYMBOL (scm_keyword_prefix, "prefix"); |
ef4cbc08 | 63 | SCM_SYMBOL (scm_keyword_postfix, "postfix"); |
7c4aad9c | 64 | SCM_SYMBOL (sym_nil, "nil"); |
c7733771 | 65 | |
92c2555f | 66 | scm_t_option scm_read_opts[] = { |
b7ff98dd MD |
67 | { SCM_OPTION_BOOLEAN, "copy", 0, |
68 | "Copy source code expressions." }, | |
6c51a40a | 69 | { SCM_OPTION_BOOLEAN, "positions", 1, |
deca31e1 GH |
70 | "Record positions of source code expressions." }, |
71 | { SCM_OPTION_BOOLEAN, "case-insensitive", 0, | |
c7733771 | 72 | "Convert symbols to lower case."}, |
3d27ef4b | 73 | { SCM_OPTION_SCM, "keywords", (scm_t_bits) SCM_BOOL_F, |
904fabb6 | 74 | "Style of keyword recognition: #f, 'prefix or 'postfix."}, |
dea901d6 MG |
75 | { SCM_OPTION_BOOLEAN, "r6rs-hex-escapes", 0, |
76 | "Use R6RS variable-length character and string hex escapes."}, | |
5afa815c AW |
77 | { SCM_OPTION_BOOLEAN, "square-brackets", 1, |
78 | "Treat `[' and `]' as parentheses, for R6RS compatibility."}, | |
684d664e AW |
79 | { SCM_OPTION_BOOLEAN, "hungry-eol-escapes", 0, |
80 | "In strings, consume leading whitespace after an escaped end-of-line."}, | |
62560650 | 81 | { 0, }, |
a16f6fe7 MD |
82 | }; |
83 | ||
39e8f371 HWN |
84 | /* |
85 | Give meaningful error messages for errors | |
86 | ||
87 | We use the format | |
88 | ||
ba1b2226 | 89 | FILE:LINE:COL: MESSAGE |
39e8f371 HWN |
90 | This happened in .... |
91 | ||
92 | This is not standard GNU format, but the test-suite likes the real | |
93 | message to be in front. | |
94 | ||
39e8f371 HWN |
95 | */ |
96 | ||
97 | ||
a4022e69 MV |
98 | void |
99 | scm_i_input_error (char const *function, | |
100 | SCM port, const char *message, SCM arg) | |
ba1b2226 | 101 | { |
29a837fd MV |
102 | SCM fn = (scm_is_string (SCM_FILENAME(port)) |
103 | ? SCM_FILENAME(port) | |
104 | : scm_from_locale_string ("#<unknown port>")); | |
ba1b2226 | 105 | |
29a837fd | 106 | SCM string_port = scm_open_output_string (); |
ba1b2226 HWN |
107 | SCM string = SCM_EOL; |
108 | scm_simple_format (string_port, | |
272632a6 | 109 | scm_from_locale_string ("~A:~S:~S: ~A"), |
29a837fd | 110 | scm_list_4 (fn, |
b3aa4626 | 111 | scm_from_long (SCM_LINUM (port) + 1), |
b9bd8526 | 112 | scm_from_int (SCM_COL (port) + 1), |
272632a6 | 113 | scm_from_locale_string (message))); |
ba1b2226 HWN |
114 | |
115 | string = scm_get_output_string (string_port); | |
116 | scm_close_output_port (string_port); | |
4a655e50 | 117 | scm_error_scm (scm_from_latin1_symbol ("read-error"), |
a4022e69 | 118 | function? scm_from_locale_string (function) : SCM_BOOL_F, |
ba1b2226 | 119 | string, |
dd72382c | 120 | arg, |
ba1b2226 HWN |
121 | SCM_BOOL_F); |
122 | } | |
39e8f371 HWN |
123 | |
124 | ||
a1ec6916 | 125 | SCM_DEFINE (scm_read_options, "read-options-interface", 0, 1, 0, |
1bbd0b84 | 126 | (SCM setting), |
dc7fa443 MG |
127 | "Option interface for the read options. Instead of using\n" |
128 | "this procedure directly, use the procedures @code{read-enable},\n" | |
3939e9df | 129 | "@code{read-disable}, @code{read-set!} and @code{read-options}.") |
1bbd0b84 | 130 | #define FUNC_NAME s_scm_read_options |
a16f6fe7 | 131 | { |
b7ff98dd MD |
132 | SCM ans = scm_options (setting, |
133 | scm_read_opts, | |
1bbd0b84 | 134 | FUNC_NAME); |
b7ff98dd MD |
135 | if (SCM_COPY_SOURCE_P) |
136 | SCM_RECORD_POSITIONS_P = 1; | |
a16f6fe7 MD |
137 | return ans; |
138 | } | |
1bbd0b84 | 139 | #undef FUNC_NAME |
a16f6fe7 | 140 | |
d458073b AR |
141 | /* A fluid referring to an association list mapping extra hash |
142 | characters to procedures. */ | |
143 | static SCM *scm_i_read_hash_procedures; | |
deca31e1 | 144 | |
d458073b AR |
145 | static inline SCM |
146 | scm_i_read_hash_procedures_ref (void) | |
147 | { | |
148 | return scm_fluid_ref (*scm_i_read_hash_procedures); | |
149 | } | |
150 | ||
151 | static inline void | |
152 | scm_i_read_hash_procedures_set_x (SCM value) | |
153 | { | |
154 | scm_fluid_set_x (*scm_i_read_hash_procedures, value); | |
155 | } | |
0f2d19dd | 156 | |
7337d56d LC |
157 | \f |
158 | /* Token readers. */ | |
0f2d19dd | 159 | |
0f2d19dd | 160 | |
7337d56d LC |
161 | /* Size of the C buffer used to read symbols and numbers. */ |
162 | #define READER_BUFFER_SIZE 128 | |
0f2d19dd | 163 | |
7337d56d LC |
164 | /* Size of the C buffer used to read strings. */ |
165 | #define READER_STRING_BUFFER_SIZE 512 | |
0f2d19dd | 166 | |
7337d56d LC |
167 | /* The maximum size of Scheme character names. */ |
168 | #define READER_CHAR_NAME_MAX_SIZE 50 | |
1cc91f1b | 169 | |
94115ae3 | 170 | |
7337d56d LC |
171 | /* `isblank' is only in C99. */ |
172 | #define CHAR_IS_BLANK_(_chr) \ | |
173 | (((_chr) == ' ') || ((_chr) == '\t') || ((_chr) == '\n') \ | |
d41668fa | 174 | || ((_chr) == '\f') || ((_chr) == '\r')) |
7337d56d LC |
175 | |
176 | #ifdef MSDOS | |
177 | # define CHAR_IS_BLANK(_chr) \ | |
178 | ((CHAR_IS_BLANK_ (chr)) || ((_chr) == 26)) | |
179 | #else | |
180 | # define CHAR_IS_BLANK CHAR_IS_BLANK_ | |
181 | #endif | |
182 | ||
183 | ||
184 | /* R5RS one-character delimiters (see section 7.1.1, ``Lexical | |
185 | structure''). */ | |
186 | #define CHAR_IS_R5RS_DELIMITER(c) \ | |
187 | (CHAR_IS_BLANK (c) \ | |
5afa815c AW |
188 | || (c == ')') || (c == '(') || (c == ';') || (c == '"') \ |
189 | || (SCM_SQUARE_BRACKETS_P && ((c == '[') || (c == ']')))) | |
7337d56d LC |
190 | |
191 | #define CHAR_IS_DELIMITER CHAR_IS_R5RS_DELIMITER | |
192 | ||
193 | /* Exponent markers, as defined in section 7.1.1 of R5RS, ``Lexical | |
194 | Structure''. */ | |
195 | #define CHAR_IS_EXPONENT_MARKER(_chr) \ | |
196 | (((_chr) == 'e') || ((_chr) == 's') || ((_chr) == 'f') \ | |
197 | || ((_chr) == 'd') || ((_chr) == 'l')) | |
198 | ||
454866e0 | 199 | /* Read an SCSH block comment. */ |
620c8965 LC |
200 | static inline SCM scm_read_scsh_block_comment (scm_t_wchar, SCM); |
201 | static SCM scm_read_r6rs_block_comment (scm_t_wchar, SCM); | |
202 | static SCM scm_read_commented_expression (scm_t_wchar, SCM); | |
911b03b2 | 203 | static SCM scm_read_shebang (scm_t_wchar, SCM); |
620c8965 | 204 | static SCM scm_get_hash_procedure (int); |
454866e0 | 205 | |
69f90b0b MG |
206 | /* Read from PORT until a delimiter (e.g., a whitespace) is read. Put the |
207 | result in the pre-allocated buffer BUF. Return zero if the whole token has | |
208 | fewer than BUF_SIZE bytes, non-zero otherwise. READ will be set the number of | |
209 | bytes actually read. */ | |
7337d56d | 210 | static inline int |
69f90b0b MG |
211 | read_token (SCM port, char *buf, const size_t buf_size, size_t *read) |
212 | { | |
213 | *read = 0; | |
0520c320 | 214 | |
69f90b0b MG |
215 | while (*read < buf_size) |
216 | { | |
217 | int chr; | |
7337d56d | 218 | |
69f90b0b | 219 | chr = scm_get_byte_or_eof (port); |
889975e5 | 220 | |
69f90b0b MG |
221 | if (chr == EOF) |
222 | return 0; | |
223 | else if (CHAR_IS_DELIMITER (chr)) | |
224 | { | |
225 | scm_unget_byte (chr, port); | |
226 | return 0; | |
227 | } | |
228 | else | |
229 | { | |
230 | *buf = (char) chr; | |
231 | buf++, (*read)++; | |
232 | } | |
233 | } | |
889975e5 | 234 | |
69f90b0b MG |
235 | return 1; |
236 | } | |
889975e5 | 237 | |
69f90b0b MG |
238 | /* Read from PORT until a delimiter (e.g., a whitespace) is read. Put the |
239 | result in the pre-allocated buffer BUFFER, if the whole token has fewer than | |
240 | BUFFER_SIZE bytes, or into OVERFLOW_BUFFER, allocated here to be freed by the | |
241 | caller. Return zero if the token fits in BUFFER, non-zero otherwise. READ | |
242 | will be set the number of bytes actually read. */ | |
243 | static int | |
244 | read_complete_token (SCM port, char *buffer, const size_t buffer_size, | |
245 | char **overflow_buffer, size_t *read) | |
246 | { | |
247 | int overflow = 0; | |
248 | size_t bytes_read, overflow_size; | |
7337d56d | 249 | |
69f90b0b MG |
250 | *overflow_buffer = NULL; |
251 | overflow_size = 0; | |
1cc91f1b | 252 | |
69f90b0b MG |
253 | do |
254 | { | |
255 | overflow = read_token (port, buffer, buffer_size, &bytes_read); | |
256 | if (bytes_read == 0) | |
257 | break; | |
258 | if (overflow || overflow_size != 0) | |
259 | { | |
260 | if (overflow_size == 0) | |
261 | { | |
262 | *overflow_buffer = scm_malloc (bytes_read); | |
263 | memcpy (*overflow_buffer, buffer, bytes_read); | |
264 | overflow_size = bytes_read; | |
265 | } | |
266 | else | |
267 | { | |
268 | *overflow_buffer = scm_realloc (*overflow_buffer, overflow_size + bytes_read); | |
269 | memcpy (*overflow_buffer + overflow_size, buffer, bytes_read); | |
270 | overflow_size += bytes_read; | |
271 | } | |
272 | } | |
889975e5 | 273 | } |
69f90b0b | 274 | while (overflow); |
889975e5 | 275 | |
69f90b0b MG |
276 | if (overflow_size) |
277 | *read = overflow_size; | |
b521d265 | 278 | else |
69f90b0b MG |
279 | *read = bytes_read; |
280 | ||
281 | return (overflow_size != 0); | |
889975e5 | 282 | } |
7337d56d LC |
283 | |
284 | /* Skip whitespace from PORT and return the first non-whitespace character | |
285 | read. Raise an error on end-of-file. */ | |
286 | static int | |
287 | flush_ws (SCM port, const char *eoferr) | |
0f2d19dd | 288 | { |
889975e5 | 289 | register scm_t_wchar c; |
0f2d19dd | 290 | while (1) |
b7f3516f | 291 | switch (c = scm_getc (port)) |
0f2d19dd JB |
292 | { |
293 | case EOF: | |
294 | goteof: | |
295 | if (eoferr) | |
d156d3b7 | 296 | { |
a4022e69 MV |
297 | scm_i_input_error (eoferr, |
298 | port, | |
299 | "end of file", | |
300 | SCM_EOL); | |
d156d3b7 | 301 | } |
0f2d19dd | 302 | return c; |
7337d56d | 303 | |
0f2d19dd JB |
304 | case ';': |
305 | lp: | |
b7f3516f | 306 | switch (c = scm_getc (port)) |
0f2d19dd JB |
307 | { |
308 | case EOF: | |
309 | goto goteof; | |
310 | default: | |
311 | goto lp; | |
312 | case SCM_LINE_INCREMENTORS: | |
313 | break; | |
314 | } | |
315 | break; | |
7337d56d | 316 | |
454866e0 LC |
317 | case '#': |
318 | switch (c = scm_getc (port)) | |
319 | { | |
320 | case EOF: | |
321 | eoferr = "read_sharp"; | |
322 | goto goteof; | |
323 | case '!': | |
911b03b2 | 324 | scm_read_shebang (c, port); |
454866e0 | 325 | break; |
34f3d47d AW |
326 | case ';': |
327 | scm_read_commented_expression (c, port); | |
328 | break; | |
620c8965 LC |
329 | case '|': |
330 | if (scm_is_false (scm_get_hash_procedure (c))) | |
331 | { | |
332 | scm_read_r6rs_block_comment (c, port); | |
333 | break; | |
334 | } | |
335 | /* fall through */ | |
454866e0 LC |
336 | default: |
337 | scm_ungetc (c, port); | |
338 | return '#'; | |
339 | } | |
340 | break; | |
341 | ||
0f2d19dd | 342 | case SCM_LINE_INCREMENTORS: |
0f2d19dd | 343 | case SCM_SINGLE_SPACES: |
0f2d19dd | 344 | case '\t': |
0f2d19dd | 345 | break; |
7337d56d | 346 | |
0f2d19dd JB |
347 | default: |
348 | return c; | |
349 | } | |
7337d56d LC |
350 | |
351 | return 0; | |
0f2d19dd JB |
352 | } |
353 | ||
354 | ||
7337d56d LC |
355 | \f |
356 | /* Token readers. */ | |
1cc91f1b | 357 | |
7337d56d LC |
358 | static SCM scm_read_expression (SCM port); |
359 | static SCM scm_read_sharp (int chr, SCM port); | |
7337d56d | 360 | static SCM recsexpr (SCM obj, long line, int column, SCM filename); |
0f2d19dd JB |
361 | |
362 | ||
09a4f039 | 363 | static SCM |
889975e5 | 364 | scm_read_sexp (scm_t_wchar chr, SCM port) |
7337d56d | 365 | #define FUNC_NAME "scm_i_lreadparen" |
09a4f039 | 366 | { |
7337d56d LC |
367 | register int c; |
368 | register SCM tmp; | |
369 | register SCM tl, ans = SCM_EOL; | |
bd22f1c7 | 370 | SCM tl2 = SCM_EOL, ans2 = SCM_EOL, copy = SCM_BOOL_F; |
5afa815c | 371 | const int terminating_char = ((chr == '[') ? ']' : ')'); |
7337d56d LC |
372 | |
373 | /* Need to capture line and column numbers here. */ | |
374 | long line = SCM_LINUM (port); | |
375 | int column = SCM_COL (port) - 1; | |
f9c68a47 | 376 | |
f9c68a47 | 377 | |
7337d56d LC |
378 | c = flush_ws (port, FUNC_NAME); |
379 | if (terminating_char == c) | |
380 | return SCM_EOL; | |
f9c68a47 | 381 | |
7337d56d LC |
382 | scm_ungetc (c, port); |
383 | if (scm_is_eq (scm_sym_dot, | |
384 | (tmp = scm_read_expression (port)))) | |
385 | { | |
386 | ans = scm_read_expression (port); | |
387 | if (terminating_char != (c = flush_ws (port, FUNC_NAME))) | |
388 | scm_i_input_error (FUNC_NAME, port, "missing close paren", | |
389 | SCM_EOL); | |
390 | return ans; | |
391 | } | |
1cc91f1b | 392 | |
7337d56d LC |
393 | /* Build the head of the list structure. */ |
394 | ans = tl = scm_cons (tmp, SCM_EOL); | |
395 | ||
396 | if (SCM_COPY_SOURCE_P) | |
397 | ans2 = tl2 = scm_cons (scm_is_pair (tmp) | |
398 | ? copy | |
399 | : tmp, | |
400 | SCM_EOL); | |
401 | ||
402 | while (terminating_char != (c = flush_ws (port, FUNC_NAME))) | |
0f2d19dd | 403 | { |
7337d56d | 404 | SCM new_tail; |
0f2d19dd | 405 | |
5b69315e AW |
406 | if (c == ')' || (SCM_SQUARE_BRACKETS_P && c == ']')) |
407 | scm_i_input_error (FUNC_NAME, port, | |
408 | "in pair: mismatched close paren: ~A", | |
409 | scm_list_1 (SCM_MAKE_CHAR (c))); | |
410 | ||
7337d56d | 411 | scm_ungetc (c, port); |
5b69315e AW |
412 | tmp = scm_read_expression (port); |
413 | ||
414 | if (scm_is_eq (scm_sym_dot, tmp)) | |
0f2d19dd | 415 | { |
7337d56d LC |
416 | SCM_SETCDR (tl, tmp = scm_read_expression (port)); |
417 | ||
418 | if (SCM_COPY_SOURCE_P) | |
419 | SCM_SETCDR (tl2, scm_cons (scm_is_pair (tmp) ? copy : tmp, | |
420 | SCM_EOL)); | |
421 | ||
422 | c = flush_ws (port, FUNC_NAME); | |
423 | if (terminating_char != c) | |
424 | scm_i_input_error (FUNC_NAME, port, | |
425 | "in pair: missing close paren", SCM_EOL); | |
426 | goto exit; | |
0f2d19dd | 427 | } |
b858464a | 428 | |
7337d56d LC |
429 | new_tail = scm_cons (tmp, SCM_EOL); |
430 | SCM_SETCDR (tl, new_tail); | |
431 | tl = new_tail; | |
432 | ||
433 | if (SCM_COPY_SOURCE_P) | |
0f2d19dd | 434 | { |
7337d56d LC |
435 | SCM new_tail2 = scm_cons (scm_is_pair (tmp) |
436 | ? copy | |
437 | : tmp, SCM_EOL); | |
438 | SCM_SETCDR (tl2, new_tail2); | |
439 | tl2 = new_tail2; | |
440 | } | |
441 | } | |
0f2d19dd | 442 | |
7337d56d LC |
443 | exit: |
444 | if (SCM_RECORD_POSITIONS_P) | |
d1c4720c AW |
445 | scm_hashq_set_x (scm_source_whash, |
446 | ans, | |
447 | scm_make_srcprops (line, column, | |
448 | SCM_FILENAME (port), | |
449 | SCM_COPY_SOURCE_P | |
450 | ? ans2 | |
451 | : SCM_UNDEFINED, | |
452 | SCM_EOL)); | |
7337d56d LC |
453 | return ans; |
454 | } | |
455 | #undef FUNC_NAME | |
a4022e69 | 456 | |
c5661d28 MG |
457 | |
458 | /* Read a hexadecimal number NDIGITS in length. Put its value into the variable | |
dea901d6 MG |
459 | C. If TERMINATOR is non-null, terminate early if the TERMINATOR character is |
460 | found. */ | |
461 | #define SCM_READ_HEX_ESCAPE(ndigits, terminator) \ | |
462 | do \ | |
463 | { \ | |
464 | scm_t_wchar a; \ | |
465 | size_t i = 0; \ | |
466 | c = 0; \ | |
467 | while (i < ndigits) \ | |
468 | { \ | |
469 | a = scm_getc (port); \ | |
470 | if (a == EOF) \ | |
471 | goto str_eof; \ | |
472 | if (terminator \ | |
473 | && (a == (scm_t_wchar) terminator) \ | |
474 | && (i > 0)) \ | |
475 | break; \ | |
476 | if ('0' <= a && a <= '9') \ | |
477 | a -= '0'; \ | |
478 | else if ('A' <= a && a <= 'F') \ | |
479 | a = a - 'A' + 10; \ | |
480 | else if ('a' <= a && a <= 'f') \ | |
481 | a = a - 'a' + 10; \ | |
482 | else \ | |
483 | { \ | |
484 | c = a; \ | |
485 | goto bad_escaped; \ | |
486 | } \ | |
487 | c = c * 16 + a; \ | |
488 | i ++; \ | |
489 | } \ | |
c5661d28 MG |
490 | } while (0) |
491 | ||
684d664e AW |
492 | static void |
493 | skip_intraline_whitespace (SCM port) | |
494 | { | |
495 | scm_t_wchar c; | |
496 | ||
497 | do | |
498 | { | |
499 | c = scm_getc (port); | |
500 | if (c == EOF) | |
501 | return; | |
502 | } | |
503 | while (c == '\t' || uc_is_general_category (c, UC_SPACE_SEPARATOR)); | |
504 | ||
505 | scm_ungetc (c, port); | |
506 | } | |
507 | ||
7337d56d LC |
508 | static SCM |
509 | scm_read_string (int chr, SCM port) | |
510 | #define FUNC_NAME "scm_lreadr" | |
511 | { | |
512 | /* For strings smaller than C_STR, this function creates only one Scheme | |
513 | object (the string returned). */ | |
0f2d19dd | 514 | |
7337d56d | 515 | SCM str = SCM_BOOL_F; |
7337d56d | 516 | unsigned c_str_len = 0; |
9c44cd45 | 517 | scm_t_wchar c; |
eb42ff25 | 518 | |
190d4b0d | 519 | str = scm_i_make_string (READER_STRING_BUFFER_SIZE, NULL, 0); |
7337d56d LC |
520 | while ('"' != (c = scm_getc (port))) |
521 | { | |
522 | if (c == EOF) | |
9c44cd45 MG |
523 | { |
524 | str_eof: | |
525 | scm_i_input_error (FUNC_NAME, port, | |
526 | "end of file in string constant", SCM_EOL); | |
527 | } | |
0f2d19dd | 528 | |
9c44cd45 MG |
529 | if (c_str_len + 1 >= scm_i_string_length (str)) |
530 | { | |
190d4b0d | 531 | SCM addy = scm_i_make_string (READER_STRING_BUFFER_SIZE, NULL, 0); |
0f2d19dd | 532 | |
9c44cd45 MG |
533 | str = scm_string_append (scm_list_2 (str, addy)); |
534 | } | |
0f2d19dd | 535 | |
7337d56d | 536 | if (c == '\\') |
9c44cd45 MG |
537 | { |
538 | switch (c = scm_getc (port)) | |
539 | { | |
540 | case EOF: | |
541 | goto str_eof; | |
542 | case '"': | |
543 | case '\\': | |
544 | break; | |
9c44cd45 | 545 | case '\n': |
684d664e AW |
546 | if (SCM_HUNGRY_EOL_ESCAPES_P) |
547 | skip_intraline_whitespace (port); | |
9c44cd45 MG |
548 | continue; |
549 | case '0': | |
550 | c = '\0'; | |
551 | break; | |
552 | case 'f': | |
553 | c = '\f'; | |
554 | break; | |
555 | case 'n': | |
556 | c = '\n'; | |
557 | break; | |
558 | case 'r': | |
559 | c = '\r'; | |
560 | break; | |
561 | case 't': | |
562 | c = '\t'; | |
563 | break; | |
564 | case 'a': | |
565 | c = '\007'; | |
566 | break; | |
567 | case 'v': | |
568 | c = '\v'; | |
569 | break; | |
67a4a16d MG |
570 | case 'b': |
571 | c = '\010'; | |
572 | break; | |
9c44cd45 | 573 | case 'x': |
dea901d6 MG |
574 | if (SCM_R6RS_ESCAPES_P) |
575 | SCM_READ_HEX_ESCAPE (10, ';'); | |
576 | else | |
577 | SCM_READ_HEX_ESCAPE (2, '\0'); | |
c5661d28 | 578 | break; |
9c44cd45 | 579 | case 'u': |
898a0b5a MG |
580 | if (!SCM_R6RS_ESCAPES_P) |
581 | { | |
582 | SCM_READ_HEX_ESCAPE (4, '\0'); | |
583 | break; | |
584 | } | |
9c44cd45 | 585 | case 'U': |
898a0b5a MG |
586 | if (!SCM_R6RS_ESCAPES_P) |
587 | { | |
588 | SCM_READ_HEX_ESCAPE (6, '\0'); | |
589 | break; | |
590 | } | |
9c44cd45 MG |
591 | default: |
592 | bad_escaped: | |
593 | scm_i_input_error (FUNC_NAME, port, | |
594 | "illegal character in escape sequence: ~S", | |
595 | scm_list_1 (SCM_MAKE_CHAR (c))); | |
596 | } | |
597 | } | |
598 | str = scm_i_string_start_writing (str); | |
599 | scm_i_string_set_x (str, c_str_len++, c); | |
600 | scm_i_string_stop_writing (); | |
7337d56d | 601 | } |
f13b4400 | 602 | |
7337d56d LC |
603 | if (c_str_len > 0) |
604 | { | |
9c44cd45 | 605 | return scm_i_substring_copy (str, 0, c_str_len); |
0f2d19dd | 606 | } |
69f90b0b | 607 | |
9c44cd45 | 608 | return scm_nullstr; |
0f2d19dd | 609 | } |
db4b4ca6 DH |
610 | #undef FUNC_NAME |
611 | ||
0f2d19dd | 612 | |
7337d56d | 613 | static SCM |
889975e5 | 614 | scm_read_number (scm_t_wchar chr, SCM port) |
0f2d19dd | 615 | { |
69f90b0b MG |
616 | SCM result, str = SCM_EOL; |
617 | char buffer[READER_BUFFER_SIZE]; | |
618 | char *overflow_buffer = NULL; | |
619 | size_t bytes_read; | |
620 | int overflow; | |
621 | scm_t_port *pt = SCM_PTAB_ENTRY (port); | |
0f2d19dd | 622 | |
7337d56d | 623 | scm_ungetc (chr, port); |
69f90b0b MG |
624 | overflow = read_complete_token (port, buffer, sizeof (buffer), |
625 | &overflow_buffer, &bytes_read); | |
626 | ||
627 | if (!overflow) | |
628 | str = scm_from_stringn (buffer, bytes_read, pt->encoding, pt->ilseq_handler); | |
629 | else | |
630 | str = scm_from_stringn (overflow_buffer, bytes_read, pt->encoding, | |
631 | pt->ilseq_handler); | |
632 | ||
633 | result = scm_string_to_number (str, SCM_UNDEFINED); | |
889975e5 | 634 | if (!scm_is_true (result)) |
69f90b0b MG |
635 | { |
636 | /* Return a symbol instead of a number */ | |
637 | if (SCM_CASE_INSENSITIVE_P) | |
638 | str = scm_string_downcase_x (str); | |
639 | result = scm_string_to_symbol (str); | |
640 | } | |
0f2d19dd | 641 | |
69f90b0b MG |
642 | if (overflow) |
643 | free (overflow_buffer); | |
644 | SCM_COL (port) += scm_i_string_length (str); | |
7337d56d LC |
645 | return result; |
646 | } | |
0f2d19dd | 647 | |
7337d56d | 648 | static SCM |
889975e5 | 649 | scm_read_mixed_case_symbol (scm_t_wchar chr, SCM port) |
7337d56d | 650 | { |
889975e5 MG |
651 | SCM result; |
652 | int ends_with_colon = 0; | |
69f90b0b | 653 | size_t bytes_read; |
ef4cbc08 | 654 | int postfix = scm_is_eq (SCM_PACK (SCM_KEYWORD_STYLE), scm_keyword_postfix); |
69f90b0b MG |
655 | int overflow; |
656 | char buffer[READER_BUFFER_SIZE], *overflow_buffer; | |
657 | scm_t_port *pt = SCM_PTAB_ENTRY (port); | |
658 | SCM str; | |
7337d56d LC |
659 | |
660 | scm_ungetc (chr, port); | |
69f90b0b MG |
661 | overflow = read_complete_token (port, buffer, READER_BUFFER_SIZE, |
662 | &overflow_buffer, &bytes_read); | |
663 | if (bytes_read > 0) | |
664 | { | |
665 | if (!overflow) | |
666 | ends_with_colon = buffer[bytes_read - 1] == ':'; | |
667 | else | |
668 | ends_with_colon = overflow_buffer[bytes_read - 1] == ':'; | |
669 | } | |
ef4cbc08 | 670 | |
69f90b0b MG |
671 | if (postfix && ends_with_colon && (bytes_read > 1)) |
672 | { | |
673 | if (!overflow) | |
674 | str = scm_from_stringn (buffer, bytes_read - 1, pt->encoding, pt->ilseq_handler); | |
675 | else | |
676 | str = scm_from_stringn (overflow_buffer, bytes_read - 1, pt->encoding, | |
677 | pt->ilseq_handler); | |
678 | ||
679 | if (SCM_CASE_INSENSITIVE_P) | |
680 | str = scm_string_downcase_x (str); | |
681 | result = scm_symbol_to_keyword (scm_string_to_symbol (str)); | |
682 | } | |
7337d56d | 683 | else |
69f90b0b MG |
684 | { |
685 | if (!overflow) | |
686 | str = scm_from_stringn (buffer, bytes_read, pt->encoding, pt->ilseq_handler); | |
687 | else | |
688 | str = scm_from_stringn (overflow_buffer, bytes_read, pt->encoding, | |
689 | pt->ilseq_handler); | |
690 | ||
691 | if (SCM_CASE_INSENSITIVE_P) | |
692 | str = scm_string_downcase_x (str); | |
693 | result = scm_string_to_symbol (str); | |
694 | } | |
7337d56d | 695 | |
69f90b0b MG |
696 | if (overflow) |
697 | free (overflow_buffer); | |
698 | SCM_COL (port) += scm_i_string_length (str); | |
7337d56d LC |
699 | return result; |
700 | } | |
701 | ||
702 | static SCM | |
889975e5 | 703 | scm_read_number_and_radix (scm_t_wchar chr, SCM port) |
7337d56d LC |
704 | #define FUNC_NAME "scm_lreadr" |
705 | { | |
889975e5 | 706 | SCM result; |
7337d56d | 707 | size_t read; |
69f90b0b MG |
708 | char buffer[READER_BUFFER_SIZE], *overflow_buffer; |
709 | int overflow; | |
7337d56d | 710 | unsigned int radix; |
69f90b0b MG |
711 | SCM str; |
712 | scm_t_port *pt; | |
7337d56d LC |
713 | |
714 | switch (chr) | |
715 | { | |
716 | case 'B': | |
717 | case 'b': | |
718 | radix = 2; | |
719 | break; | |
720 | ||
721 | case 'o': | |
722 | case 'O': | |
723 | radix = 8; | |
724 | break; | |
725 | ||
726 | case 'd': | |
727 | case 'D': | |
728 | radix = 10; | |
729 | break; | |
730 | ||
731 | case 'x': | |
732 | case 'X': | |
733 | radix = 16; | |
734 | break; | |
735 | ||
736 | default: | |
737 | scm_ungetc (chr, port); | |
738 | scm_ungetc ('#', port); | |
739 | radix = 10; | |
740 | } | |
741 | ||
69f90b0b MG |
742 | overflow = read_complete_token (port, buffer, sizeof (buffer), |
743 | &overflow_buffer, &read); | |
744 | ||
745 | pt = SCM_PTAB_ENTRY (port); | |
746 | if (!overflow) | |
747 | str = scm_from_stringn (buffer, read, pt->encoding, pt->ilseq_handler); | |
748 | else | |
749 | str = scm_from_stringn (overflow_buffer, read, pt->encoding, | |
750 | pt->ilseq_handler); | |
751 | ||
752 | result = scm_string_to_number (str, scm_from_uint (radix)); | |
753 | ||
754 | if (overflow) | |
755 | free (overflow_buffer); | |
756 | ||
757 | SCM_COL (port) += scm_i_string_length (str); | |
7337d56d LC |
758 | |
759 | if (scm_is_true (result)) | |
760 | return result; | |
761 | ||
762 | scm_i_input_error (FUNC_NAME, port, "unknown # object", SCM_EOL); | |
763 | ||
764 | return SCM_BOOL_F; | |
765 | } | |
766 | #undef FUNC_NAME | |
767 | ||
768 | static SCM | |
769 | scm_read_quote (int chr, SCM port) | |
770 | { | |
771 | SCM p; | |
492faee1 LC |
772 | long line = SCM_LINUM (port); |
773 | int column = SCM_COL (port) - 1; | |
7337d56d LC |
774 | |
775 | switch (chr) | |
776 | { | |
777 | case '`': | |
778 | p = scm_sym_quasiquote; | |
779 | break; | |
780 | ||
781 | case '\'': | |
782 | p = scm_sym_quote; | |
783 | break; | |
784 | ||
785 | case ',': | |
786 | { | |
889975e5 | 787 | scm_t_wchar c; |
7337d56d LC |
788 | |
789 | c = scm_getc (port); | |
790 | if ('@' == c) | |
791 | p = scm_sym_uq_splicing; | |
792 | else | |
0f2d19dd | 793 | { |
7337d56d LC |
794 | scm_ungetc (c, port); |
795 | p = scm_sym_unquote; | |
0f2d19dd | 796 | } |
7337d56d LC |
797 | break; |
798 | } | |
0f2d19dd | 799 | |
7337d56d LC |
800 | default: |
801 | fprintf (stderr, "%s: unhandled quote character (%i)\n", | |
7f74cf9a | 802 | "scm_read_quote", chr); |
7337d56d | 803 | abort (); |
0f2d19dd | 804 | } |
1cc91f1b | 805 | |
7337d56d | 806 | p = scm_cons2 (p, scm_read_expression (port), SCM_EOL); |
492faee1 | 807 | if (SCM_RECORD_POSITIONS_P) |
d1c4720c AW |
808 | scm_hashq_set_x (scm_source_whash, p, |
809 | scm_make_srcprops (line, column, | |
810 | SCM_FILENAME (port), | |
811 | SCM_COPY_SOURCE_P | |
812 | ? (scm_cons2 (SCM_CAR (p), | |
813 | SCM_CAR (SCM_CDR (p)), | |
814 | SCM_EOL)) | |
815 | : SCM_UNDEFINED, | |
816 | SCM_EOL)); | |
492faee1 | 817 | |
0f2d19dd | 818 | |
7337d56d LC |
819 | return p; |
820 | } | |
821 | ||
34f3d47d AW |
822 | SCM_SYMBOL (sym_syntax, "syntax"); |
823 | SCM_SYMBOL (sym_quasisyntax, "quasisyntax"); | |
824 | SCM_SYMBOL (sym_unsyntax, "unsyntax"); | |
825 | SCM_SYMBOL (sym_unsyntax_splicing, "unsyntax-splicing"); | |
826 | ||
827 | static SCM | |
828 | scm_read_syntax (int chr, SCM port) | |
829 | { | |
830 | SCM p; | |
831 | long line = SCM_LINUM (port); | |
832 | int column = SCM_COL (port) - 1; | |
833 | ||
834 | switch (chr) | |
835 | { | |
836 | case '`': | |
837 | p = sym_quasisyntax; | |
838 | break; | |
839 | ||
840 | case '\'': | |
841 | p = sym_syntax; | |
842 | break; | |
843 | ||
844 | case ',': | |
845 | { | |
846 | int c; | |
847 | ||
848 | c = scm_getc (port); | |
849 | if ('@' == c) | |
850 | p = sym_unsyntax_splicing; | |
851 | else | |
852 | { | |
853 | scm_ungetc (c, port); | |
854 | p = sym_unsyntax; | |
855 | } | |
856 | break; | |
857 | } | |
858 | ||
859 | default: | |
860 | fprintf (stderr, "%s: unhandled syntax character (%i)\n", | |
861 | "scm_read_syntax", chr); | |
862 | abort (); | |
863 | } | |
864 | ||
865 | p = scm_cons2 (p, scm_read_expression (port), SCM_EOL); | |
866 | if (SCM_RECORD_POSITIONS_P) | |
d1c4720c AW |
867 | scm_hashq_set_x (scm_source_whash, p, |
868 | scm_make_srcprops (line, column, | |
869 | SCM_FILENAME (port), | |
870 | SCM_COPY_SOURCE_P | |
871 | ? (scm_cons2 (SCM_CAR (p), | |
872 | SCM_CAR (SCM_CDR (p)), | |
873 | SCM_EOL)) | |
874 | : SCM_UNDEFINED, | |
875 | SCM_EOL)); | |
34f3d47d AW |
876 | |
877 | ||
878 | return p; | |
879 | } | |
880 | ||
7c4aad9c AW |
881 | static inline SCM |
882 | scm_read_nil (int chr, SCM port) | |
883 | { | |
884 | SCM id = scm_read_mixed_case_symbol (chr, port); | |
885 | ||
886 | if (!scm_is_eq (id, sym_nil)) | |
887 | scm_i_input_error ("scm_read_nil", port, | |
888 | "unexpected input while reading #nil: ~a", | |
889 | scm_list_1 (id)); | |
890 | ||
891 | return SCM_ELISP_NIL; | |
892 | } | |
893 | ||
7337d56d LC |
894 | static inline SCM |
895 | scm_read_semicolon_comment (int chr, SCM port) | |
0f2d19dd | 896 | { |
0f2d19dd JB |
897 | int c; |
898 | ||
889975e5 MG |
899 | /* We use the get_byte here because there is no need to get the |
900 | locale correct with comment input. This presumes that newline | |
901 | always represents itself no matter what the encoding is. */ | |
902 | for (c = scm_get_byte_or_eof (port); | |
7337d56d | 903 | (c != EOF) && (c != '\n'); |
8a8da78d | 904 | c = scm_get_byte_or_eof (port)); |
7337d56d LC |
905 | |
906 | return SCM_UNSPECIFIED; | |
907 | } | |
908 | ||
909 | \f | |
910 | /* Sharp readers, i.e. readers called after a `#' sign has been read. */ | |
911 | ||
912 | static SCM | |
913 | scm_read_boolean (int chr, SCM port) | |
914 | { | |
915 | switch (chr) | |
0f2d19dd | 916 | { |
7337d56d LC |
917 | case 't': |
918 | case 'T': | |
919 | return SCM_BOOL_T; | |
920 | ||
921 | case 'f': | |
922 | case 'F': | |
923 | return SCM_BOOL_F; | |
0f2d19dd | 924 | } |
7337d56d LC |
925 | |
926 | return SCM_UNSPECIFIED; | |
927 | } | |
928 | ||
929 | static SCM | |
889975e5 | 930 | scm_read_character (scm_t_wchar chr, SCM port) |
7337d56d LC |
931 | #define FUNC_NAME "scm_lreadr" |
932 | { | |
69f90b0b MG |
933 | char buffer[READER_CHAR_NAME_MAX_SIZE]; |
934 | SCM charname; | |
935 | size_t charname_len, bytes_read; | |
889975e5 MG |
936 | scm_t_wchar cp; |
937 | int overflow; | |
69f90b0b | 938 | scm_t_port *pt; |
889975e5 | 939 | |
69f90b0b | 940 | overflow = read_token (port, buffer, READER_CHAR_NAME_MAX_SIZE, &bytes_read); |
889975e5 | 941 | if (overflow) |
c1a0ba1c | 942 | scm_i_input_error (FUNC_NAME, port, "character name too long", SCM_EOL); |
7337d56d | 943 | |
69f90b0b | 944 | if (bytes_read == 0) |
0f2d19dd | 945 | { |
7337d56d LC |
946 | chr = scm_getc (port); |
947 | if (chr == EOF) | |
948 | scm_i_input_error (FUNC_NAME, port, "unexpected end of file " | |
949 | "while reading character", SCM_EOL); | |
950 | ||
951 | /* CHR must be a token delimiter, like a whitespace. */ | |
952 | return (SCM_MAKE_CHAR (chr)); | |
0f2d19dd | 953 | } |
7337d56d | 954 | |
69f90b0b | 955 | pt = SCM_PTAB_ENTRY (port); |
7337d56d | 956 | |
69f90b0b MG |
957 | /* Simple ASCII characters can be processed immediately. Also, simple |
958 | ISO-8859-1 characters can be processed immediately if the encoding for this | |
959 | port is ISO-8859-1. */ | |
960 | if (bytes_read == 1 && ((unsigned char) buffer[0] <= 127 || pt->encoding == NULL)) | |
961 | { | |
962 | SCM_COL (port) += 1; | |
963 | return SCM_MAKE_CHAR (buffer[0]); | |
964 | } | |
965 | ||
966 | /* Otherwise, convert the buffer into a proper scheme string for | |
967 | processing. */ | |
968 | charname = scm_from_stringn (buffer, bytes_read, pt->encoding, | |
969 | pt->ilseq_handler); | |
970 | charname_len = scm_i_string_length (charname); | |
971 | SCM_COL (port) += charname_len; | |
889975e5 | 972 | cp = scm_i_string_ref (charname, 0); |
69f90b0b MG |
973 | if (charname_len == 1) |
974 | return SCM_MAKE_CHAR (cp); | |
975 | ||
976 | /* Ignore dotted circles, which may be used to keep combining characters from | |
977 | combining with the backslash in #\charname. */ | |
0dcd7e61 MG |
978 | if (cp == SCM_CODEPOINT_DOTTED_CIRCLE && charname_len == 2) |
979 | return SCM_MAKE_CHAR (scm_i_string_ref (charname, 1)); | |
980 | ||
889975e5 | 981 | if (cp >= '0' && cp < '8') |
7337d56d LC |
982 | { |
983 | /* Dirk:FIXME:: This type of character syntax is not R5RS | |
984 | * compliant. Further, it should be verified that the constant | |
0ffc78e3 | 985 | * does only consist of octal digits. */ |
889975e5 | 986 | SCM p = scm_string_to_number (charname, scm_from_uint (8)); |
7337d56d | 987 | if (SCM_I_INUMP (p)) |
0ffc78e3 | 988 | { |
e25f3727 | 989 | scm_t_wchar c = scm_to_uint32 (p); |
0ffc78e3 MG |
990 | if (SCM_IS_UNICODE_CHAR (c)) |
991 | return SCM_MAKE_CHAR (c); | |
992 | else | |
0f3a70cf | 993 | scm_i_input_error (FUNC_NAME, port, |
0ffc78e3 MG |
994 | "out-of-range octal character escape: ~a", |
995 | scm_list_1 (charname)); | |
996 | } | |
7337d56d LC |
997 | } |
998 | ||
0f3a70cf | 999 | if (cp == 'x' && (charname_len > 1)) |
dea901d6 MG |
1000 | { |
1001 | SCM p; | |
0f3a70cf | 1002 | |
dea901d6 MG |
1003 | /* Convert from hex, skipping the initial 'x' character in CHARNAME */ |
1004 | p = scm_string_to_number (scm_c_substring (charname, 1, charname_len), | |
1005 | scm_from_uint (16)); | |
1006 | if (SCM_I_INUMP (p)) | |
1007 | { | |
e25f3727 | 1008 | scm_t_wchar c = scm_to_uint32 (p); |
dea901d6 MG |
1009 | if (SCM_IS_UNICODE_CHAR (c)) |
1010 | return SCM_MAKE_CHAR (c); | |
1011 | else | |
1012 | scm_i_input_error (FUNC_NAME, port, | |
1013 | "out-of-range hex character escape: ~a", | |
1014 | scm_list_1 (charname)); | |
1015 | } | |
1016 | } | |
1017 | ||
889975e5 MG |
1018 | /* The names of characters should never have non-Latin1 |
1019 | characters. */ | |
1020 | if (scm_i_is_narrow_string (charname) | |
1021 | || scm_i_try_narrow_string (charname)) | |
4769c9db AW |
1022 | { SCM ch = scm_i_charname_to_char (scm_i_string_chars (charname), |
1023 | charname_len); | |
1024 | if (scm_is_true (ch)) | |
1025 | return ch; | |
1026 | } | |
7337d56d | 1027 | |
7337d56d | 1028 | scm_i_input_error (FUNC_NAME, port, "unknown character name ~a", |
889975e5 | 1029 | scm_list_1 (charname)); |
7337d56d LC |
1030 | |
1031 | return SCM_UNSPECIFIED; | |
0f2d19dd | 1032 | } |
db4b4ca6 | 1033 | #undef FUNC_NAME |
0f2d19dd | 1034 | |
7337d56d LC |
1035 | static inline SCM |
1036 | scm_read_keyword (int chr, SCM port) | |
1037 | { | |
1038 | SCM symbol; | |
1039 | ||
1040 | /* Read the symbol that comprises the keyword. Doing this instead of | |
1041 | invoking a specific symbol reader function allows `scm_read_keyword ()' | |
1042 | to adapt to the delimiters currently valid of symbols. | |
1cc91f1b | 1043 | |
7337d56d LC |
1044 | XXX: This implementation allows sloppy syntaxes like `#: key'. */ |
1045 | symbol = scm_read_expression (port); | |
1046 | if (!scm_is_symbol (symbol)) | |
7f74cf9a | 1047 | scm_i_input_error ("scm_read_keyword", port, |
7337d56d LC |
1048 | "keyword prefix `~a' not followed by a symbol: ~s", |
1049 | scm_list_2 (SCM_MAKE_CHAR (chr), symbol)); | |
1050 | ||
1051 | return (scm_symbol_to_keyword (symbol)); | |
1052 | } | |
1053 | ||
1054 | static inline SCM | |
1055 | scm_read_vector (int chr, SCM port) | |
09a4f039 | 1056 | { |
7337d56d LC |
1057 | /* Note: We call `scm_read_sexp ()' rather than READER here in order to |
1058 | guarantee that it's going to do what we want. After all, this is an | |
1059 | implementation detail of `scm_read_vector ()', not a desirable | |
1060 | property. */ | |
1061 | return (scm_vector (scm_read_sexp (chr, port))); | |
1062 | } | |
09a4f039 | 1063 | |
7337d56d LC |
1064 | static inline SCM |
1065 | scm_read_srfi4_vector (int chr, SCM port) | |
1066 | { | |
1067 | return scm_i_read_array (port, chr); | |
1068 | } | |
1069 | ||
0ba0b384 | 1070 | static SCM |
889975e5 | 1071 | scm_read_bytevector (scm_t_wchar chr, SCM port) |
0ba0b384 LC |
1072 | { |
1073 | chr = scm_getc (port); | |
1074 | if (chr != 'u') | |
1075 | goto syntax; | |
1076 | ||
1077 | chr = scm_getc (port); | |
1078 | if (chr != '8') | |
1079 | goto syntax; | |
1080 | ||
1081 | chr = scm_getc (port); | |
1082 | if (chr != '(') | |
1083 | goto syntax; | |
1084 | ||
1085 | return scm_u8_list_to_bytevector (scm_read_sexp (chr, port)); | |
1086 | ||
1087 | syntax: | |
1088 | scm_i_input_error ("read_bytevector", port, | |
1089 | "invalid bytevector prefix", | |
1090 | SCM_MAKE_CHAR (chr)); | |
1091 | return SCM_UNSPECIFIED; | |
1092 | } | |
1093 | ||
7337d56d | 1094 | static SCM |
889975e5 | 1095 | scm_read_guile_bit_vector (scm_t_wchar chr, SCM port) |
7337d56d LC |
1096 | { |
1097 | /* Read the `#*10101'-style read syntax for bit vectors in Guile. This is | |
1098 | terribly inefficient but who cares? */ | |
1099 | SCM s_bits = SCM_EOL; | |
1100 | ||
1101 | for (chr = scm_getc (port); | |
1102 | (chr != EOF) && ((chr == '0') || (chr == '1')); | |
1103 | chr = scm_getc (port)) | |
09a4f039 | 1104 | { |
7337d56d | 1105 | s_bits = scm_cons ((chr == '0') ? SCM_BOOL_F : SCM_BOOL_T, s_bits); |
09a4f039 | 1106 | } |
7337d56d LC |
1107 | |
1108 | if (chr != EOF) | |
1109 | scm_ungetc (chr, port); | |
1110 | ||
1111 | return scm_bitvector (scm_reverse_x (s_bits, SCM_EOL)); | |
1112 | } | |
1113 | ||
1114 | static inline SCM | |
889975e5 | 1115 | scm_read_scsh_block_comment (scm_t_wchar chr, SCM port) |
7337d56d LC |
1116 | { |
1117 | int bang_seen = 0; | |
1118 | ||
1119 | for (;;) | |
09a4f039 | 1120 | { |
58b1db5f | 1121 | int c = scm_getc (port); |
62850ef3 | 1122 | |
7337d56d LC |
1123 | if (c == EOF) |
1124 | scm_i_input_error ("skip_block_comment", port, | |
1125 | "unterminated `#! ... !#' comment", SCM_EOL); | |
1126 | ||
1127 | if (c == '!') | |
1128 | bang_seen = 1; | |
1129 | else if (c == '#' && bang_seen) | |
1130 | break; | |
1131 | else | |
1132 | bang_seen = 0; | |
1133 | } | |
1134 | ||
1135 | return SCM_UNSPECIFIED; | |
1136 | } | |
1137 | ||
d7fcaec3 | 1138 | static SCM |
911b03b2 JG |
1139 | scm_read_shebang (scm_t_wchar chr, SCM port) |
1140 | { | |
1141 | int c = 0; | |
1142 | if ((c = scm_get_byte_or_eof (port)) != 'r') | |
1143 | { | |
1144 | scm_ungetc (c, port); | |
1145 | return scm_read_scsh_block_comment (chr, port); | |
1146 | } | |
1147 | if ((c = scm_get_byte_or_eof (port)) != '6') | |
1148 | { | |
1149 | scm_ungetc (c, port); | |
1150 | scm_ungetc ('r', port); | |
1151 | return scm_read_scsh_block_comment (chr, port); | |
1152 | } | |
1153 | if ((c = scm_get_byte_or_eof (port)) != 'r') | |
1154 | { | |
1155 | scm_ungetc (c, port); | |
1156 | scm_ungetc ('6', port); | |
1157 | scm_ungetc ('r', port); | |
1158 | return scm_read_scsh_block_comment (chr, port); | |
1159 | } | |
1160 | if ((c = scm_get_byte_or_eof (port)) != 's') | |
1161 | { | |
1162 | scm_ungetc (c, port); | |
1163 | scm_ungetc ('r', port); | |
1164 | scm_ungetc ('6', port); | |
1165 | scm_ungetc ('r', port); | |
1166 | return scm_read_scsh_block_comment (chr, port); | |
1167 | } | |
1168 | ||
1169 | return SCM_UNSPECIFIED; | |
1170 | } | |
1171 | ||
620c8965 LC |
1172 | static SCM |
1173 | scm_read_r6rs_block_comment (scm_t_wchar chr, SCM port) | |
1174 | { | |
1175 | /* Unlike SCSH-style block comments, SRFI-30/R6RS block comments may be | |
1176 | nested. So care must be taken. */ | |
1177 | int nesting_level = 1; | |
1178 | int opening_seen = 0, closing_seen = 0; | |
1179 | ||
1180 | while (nesting_level > 0) | |
1181 | { | |
1182 | int c = scm_getc (port); | |
1183 | ||
1184 | if (c == EOF) | |
cd169c5a | 1185 | scm_i_input_error ("scm_read_r6rs_block_comment", port, |
620c8965 LC |
1186 | "unterminated `#| ... |#' comment", SCM_EOL); |
1187 | ||
1188 | if (opening_seen) | |
1189 | { | |
1190 | if (c == '|') | |
1191 | nesting_level++; | |
1192 | opening_seen = 0; | |
1193 | } | |
1194 | else if (closing_seen) | |
1195 | { | |
1196 | if (c == '#') | |
1197 | nesting_level--; | |
1198 | closing_seen = 0; | |
1199 | } | |
1200 | else if (c == '|') | |
1201 | closing_seen = 1; | |
1202 | else if (c == '#') | |
1203 | opening_seen = 1; | |
1204 | else | |
1205 | opening_seen = closing_seen = 0; | |
1206 | } | |
1207 | ||
1208 | return SCM_UNSPECIFIED; | |
1209 | } | |
1210 | ||
34f3d47d | 1211 | static SCM |
889975e5 | 1212 | scm_read_commented_expression (scm_t_wchar chr, SCM port) |
34f3d47d | 1213 | { |
889975e5 | 1214 | scm_t_wchar c; |
34f3d47d AW |
1215 | |
1216 | c = flush_ws (port, (char *) NULL); | |
1217 | if (EOF == c) | |
1218 | scm_i_input_error ("read_commented_expression", port, | |
1219 | "no expression after #; comment", SCM_EOL); | |
1220 | scm_ungetc (c, port); | |
1221 | scm_read_expression (port); | |
1222 | return SCM_UNSPECIFIED; | |
1223 | } | |
1224 | ||
7337d56d | 1225 | static SCM |
889975e5 | 1226 | scm_read_extended_symbol (scm_t_wchar chr, SCM port) |
7337d56d LC |
1227 | { |
1228 | /* Guile's extended symbol read syntax looks like this: | |
1229 | ||
1230 | #{This is all a symbol name}# | |
1231 | ||
1232 | So here, CHR is expected to be `{'. */ | |
d9527cfa | 1233 | int saw_brace = 0; |
7337d56d | 1234 | size_t len = 0; |
190d4b0d | 1235 | SCM buf = scm_i_make_string (1024, NULL, 0); |
7337d56d | 1236 | |
889975e5 | 1237 | buf = scm_i_string_start_writing (buf); |
7337d56d LC |
1238 | |
1239 | while ((chr = scm_getc (port)) != EOF) | |
1240 | { | |
1241 | if (saw_brace) | |
09a4f039 | 1242 | { |
7337d56d LC |
1243 | if (chr == '#') |
1244 | { | |
7337d56d LC |
1245 | break; |
1246 | } | |
1247 | else | |
1248 | { | |
1249 | saw_brace = 0; | |
889975e5 | 1250 | scm_i_string_set_x (buf, len++, '}'); |
7337d56d | 1251 | } |
09a4f039 | 1252 | } |
d9527cfa AW |
1253 | |
1254 | if (chr == '}') | |
7337d56d | 1255 | saw_brace = 1; |
d9527cfa AW |
1256 | else if (chr == '\\') |
1257 | { | |
1258 | /* It used to be that print.c would print extended-read-syntax | |
1259 | symbols with backslashes before "non-standard" chars, but | |
1260 | this routine wouldn't do anything with those escapes. | |
1261 | Bummer. What we've done is to change print.c to output | |
1262 | R6RS hex escapes for those characters, relying on the fact | |
1263 | that the extended read syntax would never put a `\' before | |
1264 | an `x'. For now, we just ignore other instances of | |
1265 | backslash in the string. */ | |
1266 | switch ((chr = scm_getc (port))) | |
1267 | { | |
1268 | case EOF: | |
1269 | goto done; | |
1270 | case 'x': | |
1271 | { | |
1272 | scm_t_wchar c; | |
1273 | ||
1274 | SCM_READ_HEX_ESCAPE (10, ';'); | |
1275 | scm_i_string_set_x (buf, len++, c); | |
1276 | break; | |
1277 | ||
1278 | str_eof: | |
1279 | chr = EOF; | |
1280 | goto done; | |
1281 | ||
1282 | bad_escaped: | |
1283 | scm_i_string_stop_writing (); | |
1284 | scm_i_input_error ("scm_read_extended_symbol", port, | |
1285 | "illegal character in escape sequence: ~S", | |
1286 | scm_list_1 (SCM_MAKE_CHAR (c))); | |
1287 | break; | |
1288 | } | |
1289 | default: | |
1290 | scm_i_string_set_x (buf, len++, chr); | |
1291 | break; | |
1292 | } | |
1293 | } | |
7337d56d | 1294 | else |
d9527cfa | 1295 | scm_i_string_set_x (buf, len++, chr); |
62850ef3 | 1296 | |
889975e5 | 1297 | if (len >= scm_i_string_length (buf) - 2) |
7337d56d | 1298 | { |
7f991c7d LC |
1299 | SCM addy; |
1300 | ||
889975e5 | 1301 | scm_i_string_stop_writing (); |
190d4b0d | 1302 | addy = scm_i_make_string (1024, NULL, 0); |
889975e5 | 1303 | buf = scm_string_append (scm_list_2 (buf, addy)); |
7337d56d | 1304 | len = 0; |
889975e5 | 1305 | buf = scm_i_string_start_writing (buf); |
7337d56d | 1306 | } |
7337d56d | 1307 | } |
d9527cfa AW |
1308 | |
1309 | done: | |
889975e5 | 1310 | scm_i_string_stop_writing (); |
d9527cfa AW |
1311 | if (chr == EOF) |
1312 | scm_i_input_error ("scm_read_extended_symbol", port, | |
1313 | "end of file while reading symbol", SCM_EOL); | |
7337d56d | 1314 | |
889975e5 | 1315 | return (scm_string_to_symbol (scm_c_substring (buf, 0, len))); |
7337d56d LC |
1316 | } |
1317 | ||
1318 | ||
1319 | \f | |
1320 | /* Top-level token readers, i.e., dispatchers. */ | |
1321 | ||
1322 | static SCM | |
1323 | scm_read_sharp_extension (int chr, SCM port) | |
1324 | { | |
1325 | SCM proc; | |
1326 | ||
1327 | proc = scm_get_hash_procedure (chr); | |
1328 | if (scm_is_true (scm_procedure_p (proc))) | |
1329 | { | |
1330 | long line = SCM_LINUM (port); | |
1331 | int column = SCM_COL (port) - 2; | |
1332 | SCM got; | |
1333 | ||
1334 | got = scm_call_2 (proc, SCM_MAKE_CHAR (chr), port); | |
1335 | if (!scm_is_eq (got, SCM_UNSPECIFIED)) | |
62850ef3 | 1336 | { |
7337d56d LC |
1337 | if (SCM_RECORD_POSITIONS_P) |
1338 | return (recsexpr (got, line, column, | |
1339 | SCM_FILENAME (port))); | |
1340 | else | |
1341 | return got; | |
62850ef3 | 1342 | } |
09a4f039 | 1343 | } |
7337d56d LC |
1344 | |
1345 | return SCM_UNSPECIFIED; | |
1346 | } | |
1347 | ||
1348 | /* The reader for the sharp `#' character. It basically dispatches reads | |
1349 | among the above token readers. */ | |
1350 | static SCM | |
889975e5 | 1351 | scm_read_sharp (scm_t_wchar chr, SCM port) |
7337d56d LC |
1352 | #define FUNC_NAME "scm_lreadr" |
1353 | { | |
1354 | SCM result; | |
1355 | ||
1356 | chr = scm_getc (port); | |
1357 | ||
1358 | result = scm_read_sharp_extension (chr, port); | |
1359 | if (!scm_is_eq (result, SCM_UNSPECIFIED)) | |
1360 | return result; | |
1361 | ||
1362 | switch (chr) | |
1363 | { | |
1364 | case '\\': | |
1365 | return (scm_read_character (chr, port)); | |
1366 | case '(': | |
1367 | return (scm_read_vector (chr, port)); | |
1368 | case 's': | |
1369 | case 'u': | |
1370 | case 'f': | |
df941b5b | 1371 | case 'c': |
7337d56d LC |
1372 | /* This one may return either a boolean or an SRFI-4 vector. */ |
1373 | return (scm_read_srfi4_vector (chr, port)); | |
0ba0b384 LC |
1374 | case 'v': |
1375 | return (scm_read_bytevector (chr, port)); | |
7337d56d LC |
1376 | case '*': |
1377 | return (scm_read_guile_bit_vector (chr, port)); | |
1378 | case 't': | |
1379 | case 'T': | |
1380 | case 'F': | |
1381 | /* This one may return either a boolean or an SRFI-4 vector. */ | |
1382 | return (scm_read_boolean (chr, port)); | |
1383 | case ':': | |
1384 | return (scm_read_keyword (chr, port)); | |
1385 | case '0': case '1': case '2': case '3': case '4': | |
1386 | case '5': case '6': case '7': case '8': case '9': | |
1387 | case '@': | |
1388 | #if SCM_ENABLE_DEPRECATED | |
1389 | /* See below for 'i' and 'e'. */ | |
1390 | case 'a': | |
7337d56d LC |
1391 | case 'y': |
1392 | case 'h': | |
1393 | case 'l': | |
1394 | #endif | |
1395 | return (scm_i_read_array (port, chr)); | |
1396 | ||
1397 | case 'i': | |
1398 | case 'e': | |
1399 | #if SCM_ENABLE_DEPRECATED | |
1400 | { | |
1401 | /* When next char is '(', it really is an old-style | |
1402 | uniform array. */ | |
889975e5 | 1403 | scm_t_wchar next_c = scm_getc (port); |
7337d56d LC |
1404 | if (next_c != EOF) |
1405 | scm_ungetc (next_c, port); | |
1406 | if (next_c == '(') | |
1407 | return scm_i_read_array (port, chr); | |
1408 | /* Fall through. */ | |
1409 | } | |
1410 | #endif | |
1411 | case 'b': | |
1412 | case 'B': | |
1413 | case 'o': | |
1414 | case 'O': | |
1415 | case 'd': | |
1416 | case 'D': | |
1417 | case 'x': | |
1418 | case 'X': | |
1419 | case 'I': | |
1420 | case 'E': | |
1421 | return (scm_read_number_and_radix (chr, port)); | |
1422 | case '{': | |
1423 | return (scm_read_extended_symbol (chr, port)); | |
1424 | case '!': | |
911b03b2 | 1425 | return (scm_read_shebang (chr, port)); |
34f3d47d AW |
1426 | case ';': |
1427 | return (scm_read_commented_expression (chr, port)); | |
1428 | case '`': | |
1429 | case '\'': | |
1430 | case ',': | |
1431 | return (scm_read_syntax (chr, port)); | |
7c4aad9c AW |
1432 | case 'n': |
1433 | return (scm_read_nil (chr, port)); | |
7337d56d LC |
1434 | default: |
1435 | result = scm_read_sharp_extension (chr, port); | |
1436 | if (scm_is_eq (result, SCM_UNSPECIFIED)) | |
620c8965 LC |
1437 | { |
1438 | /* To remain compatible with 1.8 and earlier, the following | |
1439 | characters have lower precedence than `read-hash-extend' | |
1440 | characters. */ | |
1441 | switch (chr) | |
1442 | { | |
1443 | case '|': | |
1444 | return scm_read_r6rs_block_comment (chr, port); | |
1445 | default: | |
1446 | scm_i_input_error (FUNC_NAME, port, "Unknown # object: ~S", | |
1447 | scm_list_1 (SCM_MAKE_CHAR (chr))); | |
1448 | } | |
1449 | } | |
7337d56d LC |
1450 | else |
1451 | return result; | |
1452 | } | |
1453 | ||
1454 | return SCM_UNSPECIFIED; | |
1455 | } | |
1456 | #undef FUNC_NAME | |
1457 | ||
1458 | static SCM | |
1459 | scm_read_expression (SCM port) | |
1460 | #define FUNC_NAME "scm_read_expression" | |
1461 | { | |
1462 | while (1) | |
1463 | { | |
889975e5 | 1464 | register scm_t_wchar chr; |
7337d56d LC |
1465 | |
1466 | chr = scm_getc (port); | |
1467 | ||
1468 | switch (chr) | |
1469 | { | |
1470 | case SCM_WHITE_SPACES: | |
1471 | case SCM_LINE_INCREMENTORS: | |
1472 | break; | |
1473 | case ';': | |
1474 | (void) scm_read_semicolon_comment (chr, port); | |
1475 | break; | |
5afa815c AW |
1476 | case '[': |
1477 | if (!SCM_SQUARE_BRACKETS_P) | |
1478 | return (scm_read_mixed_case_symbol (chr, port)); | |
1479 | /* otherwise fall through */ | |
7337d56d LC |
1480 | case '(': |
1481 | return (scm_read_sexp (chr, port)); | |
1482 | case '"': | |
1483 | return (scm_read_string (chr, port)); | |
1484 | case '\'': | |
1485 | case '`': | |
1486 | case ',': | |
1487 | return (scm_read_quote (chr, port)); | |
1488 | case '#': | |
1489 | { | |
1490 | SCM result; | |
1491 | result = scm_read_sharp (chr, port); | |
1492 | if (scm_is_eq (result, SCM_UNSPECIFIED)) | |
1493 | /* We read a comment or some such. */ | |
1494 | break; | |
1495 | else | |
1496 | return result; | |
1497 | } | |
1498 | case ')': | |
1499 | scm_i_input_error (FUNC_NAME, port, "unexpected \")\"", SCM_EOL); | |
1500 | break; | |
a4e47229 MG |
1501 | case ']': |
1502 | if (SCM_SQUARE_BRACKETS_P) | |
1503 | scm_i_input_error (FUNC_NAME, port, "unexpected \"]\"", SCM_EOL); | |
1504 | /* otherwise fall through */ | |
7337d56d LC |
1505 | case EOF: |
1506 | return SCM_EOF_VAL; | |
1507 | case ':': | |
1508 | if (scm_is_eq (SCM_PACK (SCM_KEYWORD_STYLE), scm_keyword_prefix)) | |
1509 | return scm_symbol_to_keyword (scm_read_expression (port)); | |
1510 | /* Fall through. */ | |
1511 | ||
1512 | default: | |
1513 | { | |
1514 | if (((chr >= '0') && (chr <= '9')) | |
1515 | || (strchr ("+-.", chr))) | |
1516 | return (scm_read_number (chr, port)); | |
1517 | else | |
1518 | return (scm_read_mixed_case_symbol (chr, port)); | |
1519 | } | |
1520 | } | |
1521 | } | |
1522 | } | |
1523 | #undef FUNC_NAME | |
1524 | ||
1525 | \f | |
1526 | /* Actual reader. */ | |
1527 | ||
1528 | SCM_DEFINE (scm_read, "read", 0, 1, 0, | |
1529 | (SCM port), | |
1530 | "Read an s-expression from the input port @var{port}, or from\n" | |
1531 | "the current input port if @var{port} is not specified.\n" | |
1532 | "Any whitespace before the next token is discarded.") | |
1533 | #define FUNC_NAME s_scm_read | |
1534 | { | |
1535 | int c; | |
1536 | ||
1537 | if (SCM_UNBNDP (port)) | |
1538 | port = scm_current_input_port (); | |
1539 | SCM_VALIDATE_OPINPORT (1, port); | |
1540 | ||
1541 | c = flush_ws (port, (char *) NULL); | |
1542 | if (EOF == c) | |
1543 | return SCM_EOF_VAL; | |
1544 | scm_ungetc (c, port); | |
1545 | ||
1546 | return (scm_read_expression (port)); | |
09a4f039 | 1547 | } |
db4b4ca6 | 1548 | #undef FUNC_NAME |
09a4f039 | 1549 | |
0f2d19dd JB |
1550 | |
1551 | \f | |
1552 | ||
7337d56d LC |
1553 | /* Used when recording expressions constructed by `scm_read_sharp ()'. */ |
1554 | static SCM | |
1555 | recsexpr (SCM obj, long line, int column, SCM filename) | |
1556 | { | |
1557 | if (!scm_is_pair(obj)) { | |
1558 | return obj; | |
1559 | } else { | |
1560 | SCM tmp = obj, copy; | |
1561 | /* If this sexpr is visible in the read:sharp source, we want to | |
1562 | keep that information, so only record non-constant cons cells | |
1563 | which haven't previously been read by the reader. */ | |
d1c4720c | 1564 | if (scm_is_false (scm_hashq_ref (scm_source_whash, obj, SCM_BOOL_F))) |
7337d56d LC |
1565 | { |
1566 | if (SCM_COPY_SOURCE_P) | |
1567 | { | |
1568 | copy = scm_cons (recsexpr (SCM_CAR (obj), line, column, filename), | |
1569 | SCM_UNDEFINED); | |
1570 | while ((tmp = SCM_CDR (tmp)) && scm_is_pair (tmp)) | |
1571 | { | |
1572 | SCM_SETCDR (copy, scm_cons (recsexpr (SCM_CAR (tmp), | |
1573 | line, | |
1574 | column, | |
1575 | filename), | |
1576 | SCM_UNDEFINED)); | |
1577 | copy = SCM_CDR (copy); | |
1578 | } | |
1579 | SCM_SETCDR (copy, tmp); | |
1580 | } | |
1581 | else | |
1582 | { | |
1583 | recsexpr (SCM_CAR (obj), line, column, filename); | |
1584 | while ((tmp = SCM_CDR (tmp)) && scm_is_pair (tmp)) | |
1585 | recsexpr (SCM_CAR (tmp), line, column, filename); | |
1586 | copy = SCM_UNDEFINED; | |
1587 | } | |
d1c4720c AW |
1588 | scm_hashq_set_x (scm_source_whash, |
1589 | obj, | |
1590 | scm_make_srcprops (line, | |
1591 | column, | |
1592 | filename, | |
1593 | copy, | |
1594 | SCM_EOL)); | |
7337d56d LC |
1595 | } |
1596 | return obj; | |
1597 | } | |
1598 | } | |
1599 | ||
14de3b42 GH |
1600 | /* Manipulate the read-hash-procedures alist. This could be written in |
1601 | Scheme, but maybe it will also be used by C code during initialisation. */ | |
a1ec6916 | 1602 | SCM_DEFINE (scm_read_hash_extend, "read-hash-extend", 2, 0, 0, |
1bbd0b84 | 1603 | (SCM chr, SCM proc), |
dc7fa443 MG |
1604 | "Install the procedure @var{proc} for reading expressions\n" |
1605 | "starting with the character sequence @code{#} and @var{chr}.\n" | |
1606 | "@var{proc} will be called with two arguments: the character\n" | |
1607 | "@var{chr} and the port to read further data from. The object\n" | |
391f57e6 HWN |
1608 | "returned will be the return value of @code{read}. \n" |
1609 | "Passing @code{#f} for @var{proc} will remove a previous setting. \n" | |
1610 | ) | |
1bbd0b84 | 1611 | #define FUNC_NAME s_scm_read_hash_extend |
deca31e1 | 1612 | { |
fed9c9a2 GH |
1613 | SCM this; |
1614 | SCM prev; | |
1615 | ||
36284627 | 1616 | SCM_VALIDATE_CHAR (1, chr); |
7888309b | 1617 | SCM_ASSERT (scm_is_false (proc) |
bc36d050 | 1618 | || scm_is_eq (scm_procedure_p (proc), SCM_BOOL_T), |
36284627 | 1619 | proc, SCM_ARG2, FUNC_NAME); |
fed9c9a2 | 1620 | |
14de3b42 | 1621 | /* Check if chr is already in the alist. */ |
d458073b | 1622 | this = scm_i_read_hash_procedures_ref (); |
14de3b42 | 1623 | prev = SCM_BOOL_F; |
fed9c9a2 GH |
1624 | while (1) |
1625 | { | |
d2e53ed6 | 1626 | if (scm_is_null (this)) |
fed9c9a2 GH |
1627 | { |
1628 | /* not found, so add it to the beginning. */ | |
7888309b | 1629 | if (scm_is_true (proc)) |
fed9c9a2 | 1630 | { |
d458073b AR |
1631 | SCM new = scm_cons (scm_cons (chr, proc), |
1632 | scm_i_read_hash_procedures_ref ()); | |
1633 | scm_i_read_hash_procedures_set_x (new); | |
fed9c9a2 GH |
1634 | } |
1635 | break; | |
1636 | } | |
bc36d050 | 1637 | if (scm_is_eq (chr, SCM_CAAR (this))) |
fed9c9a2 GH |
1638 | { |
1639 | /* already in the alist. */ | |
7888309b | 1640 | if (scm_is_false (proc)) |
14de3b42 GH |
1641 | { |
1642 | /* remove it. */ | |
7888309b | 1643 | if (scm_is_false (prev)) |
14de3b42 | 1644 | { |
d458073b AR |
1645 | SCM rest = SCM_CDR (scm_i_read_hash_procedures_ref ()); |
1646 | scm_i_read_hash_procedures_set_x (rest); | |
14de3b42 GH |
1647 | } |
1648 | else | |
1649 | scm_set_cdr_x (prev, SCM_CDR (this)); | |
1650 | } | |
fed9c9a2 | 1651 | else |
14de3b42 GH |
1652 | { |
1653 | /* replace it. */ | |
1654 | scm_set_cdr_x (SCM_CAR (this), proc); | |
1655 | } | |
fed9c9a2 GH |
1656 | break; |
1657 | } | |
1658 | prev = this; | |
1659 | this = SCM_CDR (this); | |
1660 | } | |
deca31e1 | 1661 | |
deca31e1 GH |
1662 | return SCM_UNSPECIFIED; |
1663 | } | |
1bbd0b84 | 1664 | #undef FUNC_NAME |
0f2d19dd | 1665 | |
deca31e1 GH |
1666 | /* Recover the read-hash procedure corresponding to char c. */ |
1667 | static SCM | |
6e8d25a6 | 1668 | scm_get_hash_procedure (int c) |
deca31e1 | 1669 | { |
d458073b | 1670 | SCM rest = scm_i_read_hash_procedures_ref (); |
fed9c9a2 | 1671 | |
deca31e1 GH |
1672 | while (1) |
1673 | { | |
d2e53ed6 | 1674 | if (scm_is_null (rest)) |
deca31e1 GH |
1675 | return SCM_BOOL_F; |
1676 | ||
7866a09b | 1677 | if (SCM_CHAR (SCM_CAAR (rest)) == c) |
deca31e1 GH |
1678 | return SCM_CDAR (rest); |
1679 | ||
1680 | rest = SCM_CDR (rest); | |
1681 | } | |
1682 | } | |
1cc91f1b | 1683 | |
889975e5 MG |
1684 | #define SCM_ENCODING_SEARCH_SIZE (500) |
1685 | ||
f8a1c9a8 LC |
1686 | /* Search the first few hundred characters of a file for an Emacs-like coding |
1687 | declaration. Returns either NULL or a string whose storage has been | |
1688 | allocated with `scm_gc_malloc ()'. */ | |
889975e5 | 1689 | char * |
f8a1c9a8 | 1690 | scm_i_scan_for_encoding (SCM port) |
889975e5 | 1691 | { |
d900843c | 1692 | scm_t_port *pt; |
889975e5 | 1693 | char header[SCM_ENCODING_SEARCH_SIZE+1]; |
daedbca7 | 1694 | size_t bytes_read, encoding_length, i; |
889975e5 MG |
1695 | char *encoding = NULL; |
1696 | int utf8_bom = 0; | |
daedbca7 | 1697 | char *pos, *encoding_start; |
889975e5 MG |
1698 | int in_comment; |
1699 | ||
d900843c | 1700 | pt = SCM_PTAB_ENTRY (port); |
49bb5bd3 | 1701 | |
d900843c AW |
1702 | if (pt->rw_active == SCM_PORT_WRITE) |
1703 | scm_flush (port); | |
49bb5bd3 | 1704 | |
d900843c AW |
1705 | if (pt->rw_random) |
1706 | pt->rw_active = SCM_PORT_READ; | |
1707 | ||
1708 | if (pt->read_pos == pt->read_end) | |
1709 | { | |
1710 | /* We can use the read buffer, and thus avoid a seek. */ | |
1711 | if (scm_fill_input (port) == EOF) | |
1712 | return NULL; | |
1713 | ||
1714 | bytes_read = pt->read_end - pt->read_pos; | |
1715 | if (bytes_read > SCM_ENCODING_SEARCH_SIZE) | |
1716 | bytes_read = SCM_ENCODING_SEARCH_SIZE; | |
1717 | ||
1718 | if (bytes_read <= 1) | |
1719 | /* An unbuffered port -- don't scan. */ | |
1720 | return NULL; | |
1721 | ||
1722 | memcpy (header, pt->read_pos, bytes_read); | |
1723 | header[bytes_read] = '\0'; | |
1724 | } | |
1725 | else | |
1726 | { | |
1727 | /* Try to read some bytes and then seek back. Not all ports | |
1728 | support seeking back; and indeed some file ports (like | |
1729 | /dev/urandom) will succeed on an lseek (fd, 0, SEEK_CUR)---the | |
1730 | check performed by SCM_FPORT_FDES---but fail to seek | |
1731 | backwards. Hence this block comes second. We prefer to use | |
1732 | the read buffer in-place. */ | |
1733 | if (SCM_FPORTP (port) && !SCM_FDES_RANDOM_P (SCM_FPORT_FDES (port))) | |
1734 | return NULL; | |
1735 | ||
1736 | bytes_read = scm_c_read (port, header, SCM_ENCODING_SEARCH_SIZE); | |
1737 | header[bytes_read] = '\0'; | |
1738 | scm_seek (port, scm_from_int (0), scm_from_int (SEEK_SET)); | |
1739 | } | |
889975e5 MG |
1740 | |
1741 | if (bytes_read > 3 | |
1742 | && header[0] == '\xef' && header[1] == '\xbb' && header[2] == '\xbf') | |
1743 | utf8_bom = 1; | |
1744 | ||
1745 | /* search past "coding[:=]" */ | |
1746 | pos = header; | |
1747 | while (1) | |
1748 | { | |
1749 | if ((pos = strstr(pos, "coding")) == NULL) | |
1750 | return NULL; | |
1751 | ||
1752 | pos += strlen("coding"); | |
1753 | if (pos - header >= SCM_ENCODING_SEARCH_SIZE || | |
1754 | (*pos == ':' || *pos == '=')) | |
1755 | { | |
1756 | pos ++; | |
1757 | break; | |
1758 | } | |
1759 | } | |
1760 | ||
1761 | /* skip spaces */ | |
1762 | while (pos - header <= SCM_ENCODING_SEARCH_SIZE && | |
1763 | (*pos == ' ' || *pos == '\t')) | |
1764 | pos ++; | |
1765 | ||
1766 | /* grab the next token */ | |
daedbca7 | 1767 | encoding_start = pos; |
889975e5 | 1768 | i = 0; |
daedbca7 MG |
1769 | while (encoding_start + i - header <= SCM_ENCODING_SEARCH_SIZE |
1770 | && encoding_start + i - header < bytes_read | |
1771 | && (isalnum ((int) encoding_start[i]) | |
1772 | || strchr ("_-.:/,+=()", encoding_start[i]) != NULL)) | |
889975e5 MG |
1773 | i++; |
1774 | ||
daedbca7 MG |
1775 | encoding_length = i; |
1776 | if (encoding_length == 0) | |
889975e5 MG |
1777 | return NULL; |
1778 | ||
daedbca7 MG |
1779 | encoding = scm_gc_strndup (encoding_start, encoding_length, "encoding"); |
1780 | for (i = 0; i < encoding_length; i++) | |
026ed239 | 1781 | encoding[i] = toupper ((int) encoding[i]); |
889975e5 MG |
1782 | |
1783 | /* push backwards to make sure we were in a comment */ | |
1784 | in_comment = 0; | |
daedbca7 MG |
1785 | pos = encoding_start; |
1786 | while (pos >= header) | |
889975e5 | 1787 | { |
8a12aeb9 AW |
1788 | if (*pos == ';') |
1789 | { | |
1790 | in_comment = 1; | |
1791 | break; | |
1792 | } | |
1793 | else if (*pos == '\n' || pos == header) | |
889975e5 MG |
1794 | { |
1795 | /* This wasn't in a semicolon comment. Check for a | |
1796 | hash-bang comment. */ | |
1797 | char *beg = strstr (header, "#!"); | |
1798 | char *end = strstr (header, "!#"); | |
8a12aeb9 | 1799 | if (beg < encoding_start && encoding_start + encoding_length <= end) |
889975e5 MG |
1800 | in_comment = 1; |
1801 | break; | |
1802 | } | |
8a12aeb9 AW |
1803 | else |
1804 | { | |
1805 | pos --; | |
1806 | continue; | |
1807 | } | |
889975e5 MG |
1808 | } |
1809 | if (!in_comment) | |
f8a1c9a8 LC |
1810 | /* This wasn't in a comment */ |
1811 | return NULL; | |
1812 | ||
889975e5 | 1813 | if (utf8_bom && strcmp(encoding, "UTF-8")) |
daedbca7 | 1814 | scm_misc_error (NULL, |
889975e5 MG |
1815 | "the port input declares the encoding ~s but is encoded as UTF-8", |
1816 | scm_list_1 (scm_from_locale_string (encoding))); | |
f8a1c9a8 | 1817 | |
889975e5 MG |
1818 | return encoding; |
1819 | } | |
1820 | ||
1821 | SCM_DEFINE (scm_file_encoding, "file-encoding", 1, 0, 0, | |
1822 | (SCM port), | |
a270e133 | 1823 | "Scans the port for an Emacs-like character coding declaration\n" |
ffb62a43 | 1824 | "near the top of the contents of a port with random-accessible contents.\n" |
889975e5 MG |
1825 | "The coding declaration is of the form\n" |
1826 | "@code{coding: XXXXX} and must appear in a scheme comment.\n" | |
1827 | "\n" | |
1828 | "Returns a string containing the character encoding of the file\n" | |
1829 | "if a declaration was found, or @code{#f} otherwise.\n") | |
1830 | #define FUNC_NAME s_scm_file_encoding | |
1831 | { | |
1832 | char *enc; | |
1833 | SCM s_enc; | |
f8a1c9a8 | 1834 | |
d900843c AW |
1835 | SCM_VALIDATE_OPINPORT (SCM_ARG1, port); |
1836 | ||
f8a1c9a8 | 1837 | enc = scm_i_scan_for_encoding (port); |
889975e5 MG |
1838 | if (enc == NULL) |
1839 | return SCM_BOOL_F; | |
1840 | else | |
1841 | { | |
1842 | s_enc = scm_from_locale_string (enc); | |
889975e5 MG |
1843 | return s_enc; |
1844 | } | |
f8a1c9a8 | 1845 | |
889975e5 MG |
1846 | return SCM_BOOL_F; |
1847 | } | |
1848 | #undef FUNC_NAME | |
1849 | ||
0f2d19dd JB |
1850 | void |
1851 | scm_init_read () | |
0f2d19dd | 1852 | { |
d458073b AR |
1853 | SCM read_hash_procs; |
1854 | ||
1855 | read_hash_procs = scm_make_fluid (); | |
1856 | scm_fluid_set_x (read_hash_procs, SCM_EOL); | |
1857 | ||
1858 | scm_i_read_hash_procedures = | |
1859 | SCM_VARIABLE_LOC (scm_c_define ("%read-hash-procedures", read_hash_procs)); | |
fed9c9a2 | 1860 | |
62560650 | 1861 | scm_init_opts (scm_read_options, scm_read_opts); |
a0599745 | 1862 | #include "libguile/read.x" |
0f2d19dd | 1863 | } |
89e00824 ML |
1864 | |
1865 | /* | |
1866 | Local Variables: | |
1867 | c-file-style: "gnu" | |
1868 | End: | |
1869 | */ |