Commit | Line | Data |
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a8fc3852 | 1 | /* Copyright (C) 1995,1996,1997,1999,2000,2001,2003, 2004, 2006, 2007, 2008, 2009, 2010 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> | |
7337d56d | 32 | |
a0599745 | 33 | #include "libguile/_scm.h" |
0ba0b384 | 34 | #include "libguile/bytevectors.h" |
a0599745 MD |
35 | #include "libguile/chars.h" |
36 | #include "libguile/eval.h" | |
2fa901a5 | 37 | #include "libguile/arrays.h" |
cf396142 | 38 | #include "libguile/bitvectors.h" |
a0599745 MD |
39 | #include "libguile/keywords.h" |
40 | #include "libguile/alist.h" | |
41 | #include "libguile/srcprop.h" | |
42 | #include "libguile/hashtab.h" | |
43 | #include "libguile/hash.h" | |
44 | #include "libguile/ports.h" | |
49bb5bd3 | 45 | #include "libguile/fports.h" |
a0599745 MD |
46 | #include "libguile/root.h" |
47 | #include "libguile/strings.h" | |
ba1b2226 | 48 | #include "libguile/strports.h" |
a0599745 | 49 | #include "libguile/vectors.h" |
a0599745 | 50 | #include "libguile/validate.h" |
a4022e69 | 51 | #include "libguile/srfi-4.h" |
7337d56d | 52 | #include "libguile/srfi-13.h" |
ba1b2226 | 53 | |
a0599745 | 54 | #include "libguile/read.h" |
22fc179a HWN |
55 | #include "libguile/private-options.h" |
56 | ||
0f2d19dd JB |
57 | |
58 | \f | |
59 | ||
5bf6a6f0 | 60 | SCM_GLOBAL_SYMBOL (scm_sym_dot, "."); |
c7733771 | 61 | SCM_SYMBOL (scm_keyword_prefix, "prefix"); |
ef4cbc08 | 62 | SCM_SYMBOL (scm_keyword_postfix, "postfix"); |
c7733771 | 63 | |
92c2555f | 64 | scm_t_option scm_read_opts[] = { |
b7ff98dd MD |
65 | { SCM_OPTION_BOOLEAN, "copy", 0, |
66 | "Copy source code expressions." }, | |
ac74fc22 | 67 | { SCM_OPTION_BOOLEAN, "positions", 0, |
deca31e1 GH |
68 | "Record positions of source code expressions." }, |
69 | { SCM_OPTION_BOOLEAN, "case-insensitive", 0, | |
c7733771 | 70 | "Convert symbols to lower case."}, |
62316c7f | 71 | { SCM_OPTION_SCM, "keywords", (unsigned long) SCM_BOOL_F, |
904fabb6 | 72 | "Style of keyword recognition: #f, 'prefix or 'postfix."}, |
16353acc | 73 | #if SCM_ENABLE_ELISP |
16353acc NJ |
74 | { SCM_OPTION_BOOLEAN, "elisp-vectors", 0, |
75 | "Support Elisp vector syntax, namely `[...]'."}, | |
cd21f5eb | 76 | { SCM_OPTION_BOOLEAN, "elisp-strings", 0, |
62560650 | 77 | "Support `\\(' and `\\)' in strings."}, |
16353acc | 78 | #endif |
dea901d6 MG |
79 | { SCM_OPTION_BOOLEAN, "r6rs-hex-escapes", 0, |
80 | "Use R6RS variable-length character and string hex escapes."}, | |
5afa815c AW |
81 | { SCM_OPTION_BOOLEAN, "square-brackets", 1, |
82 | "Treat `[' and `]' as parentheses, for R6RS compatibility."}, | |
62560650 | 83 | { 0, }, |
a16f6fe7 MD |
84 | }; |
85 | ||
39e8f371 HWN |
86 | /* |
87 | Give meaningful error messages for errors | |
88 | ||
89 | We use the format | |
90 | ||
ba1b2226 | 91 | FILE:LINE:COL: MESSAGE |
39e8f371 HWN |
92 | This happened in .... |
93 | ||
94 | This is not standard GNU format, but the test-suite likes the real | |
95 | message to be in front. | |
96 | ||
39e8f371 HWN |
97 | */ |
98 | ||
99 | ||
a4022e69 MV |
100 | void |
101 | scm_i_input_error (char const *function, | |
102 | SCM port, const char *message, SCM arg) | |
ba1b2226 | 103 | { |
29a837fd MV |
104 | SCM fn = (scm_is_string (SCM_FILENAME(port)) |
105 | ? SCM_FILENAME(port) | |
106 | : scm_from_locale_string ("#<unknown port>")); | |
ba1b2226 | 107 | |
29a837fd | 108 | SCM string_port = scm_open_output_string (); |
ba1b2226 HWN |
109 | SCM string = SCM_EOL; |
110 | scm_simple_format (string_port, | |
272632a6 | 111 | scm_from_locale_string ("~A:~S:~S: ~A"), |
29a837fd | 112 | scm_list_4 (fn, |
b3aa4626 | 113 | scm_from_long (SCM_LINUM (port) + 1), |
b9bd8526 | 114 | scm_from_int (SCM_COL (port) + 1), |
272632a6 | 115 | scm_from_locale_string (message))); |
ba1b2226 HWN |
116 | |
117 | string = scm_get_output_string (string_port); | |
118 | scm_close_output_port (string_port); | |
272632a6 | 119 | scm_error_scm (scm_from_locale_symbol ("read-error"), |
a4022e69 | 120 | function? scm_from_locale_string (function) : SCM_BOOL_F, |
ba1b2226 | 121 | string, |
dd72382c | 122 | arg, |
ba1b2226 HWN |
123 | SCM_BOOL_F); |
124 | } | |
39e8f371 HWN |
125 | |
126 | ||
a1ec6916 | 127 | SCM_DEFINE (scm_read_options, "read-options-interface", 0, 1, 0, |
1bbd0b84 | 128 | (SCM setting), |
dc7fa443 MG |
129 | "Option interface for the read options. Instead of using\n" |
130 | "this procedure directly, use the procedures @code{read-enable},\n" | |
3939e9df | 131 | "@code{read-disable}, @code{read-set!} and @code{read-options}.") |
1bbd0b84 | 132 | #define FUNC_NAME s_scm_read_options |
a16f6fe7 | 133 | { |
b7ff98dd MD |
134 | SCM ans = scm_options (setting, |
135 | scm_read_opts, | |
1bbd0b84 | 136 | FUNC_NAME); |
b7ff98dd MD |
137 | if (SCM_COPY_SOURCE_P) |
138 | SCM_RECORD_POSITIONS_P = 1; | |
a16f6fe7 MD |
139 | return ans; |
140 | } | |
1bbd0b84 | 141 | #undef FUNC_NAME |
a16f6fe7 | 142 | |
14de3b42 GH |
143 | /* An association list mapping extra hash characters to procedures. */ |
144 | static SCM *scm_read_hash_procedures; | |
deca31e1 | 145 | |
0f2d19dd | 146 | |
7337d56d LC |
147 | \f |
148 | /* Token readers. */ | |
0f2d19dd | 149 | |
0f2d19dd | 150 | |
7337d56d LC |
151 | /* Size of the C buffer used to read symbols and numbers. */ |
152 | #define READER_BUFFER_SIZE 128 | |
0f2d19dd | 153 | |
7337d56d LC |
154 | /* Size of the C buffer used to read strings. */ |
155 | #define READER_STRING_BUFFER_SIZE 512 | |
0f2d19dd | 156 | |
7337d56d LC |
157 | /* The maximum size of Scheme character names. */ |
158 | #define READER_CHAR_NAME_MAX_SIZE 50 | |
1cc91f1b | 159 | |
94115ae3 | 160 | |
7337d56d LC |
161 | /* `isblank' is only in C99. */ |
162 | #define CHAR_IS_BLANK_(_chr) \ | |
163 | (((_chr) == ' ') || ((_chr) == '\t') || ((_chr) == '\n') \ | |
d41668fa | 164 | || ((_chr) == '\f') || ((_chr) == '\r')) |
7337d56d LC |
165 | |
166 | #ifdef MSDOS | |
167 | # define CHAR_IS_BLANK(_chr) \ | |
168 | ((CHAR_IS_BLANK_ (chr)) || ((_chr) == 26)) | |
169 | #else | |
170 | # define CHAR_IS_BLANK CHAR_IS_BLANK_ | |
171 | #endif | |
172 | ||
173 | ||
174 | /* R5RS one-character delimiters (see section 7.1.1, ``Lexical | |
175 | structure''). */ | |
176 | #define CHAR_IS_R5RS_DELIMITER(c) \ | |
177 | (CHAR_IS_BLANK (c) \ | |
5afa815c AW |
178 | || (c == ')') || (c == '(') || (c == ';') || (c == '"') \ |
179 | || (SCM_SQUARE_BRACKETS_P && ((c == '[') || (c == ']')))) | |
7337d56d LC |
180 | |
181 | #define CHAR_IS_DELIMITER CHAR_IS_R5RS_DELIMITER | |
182 | ||
183 | /* Exponent markers, as defined in section 7.1.1 of R5RS, ``Lexical | |
184 | Structure''. */ | |
185 | #define CHAR_IS_EXPONENT_MARKER(_chr) \ | |
186 | (((_chr) == 'e') || ((_chr) == 's') || ((_chr) == 'f') \ | |
187 | || ((_chr) == 'd') || ((_chr) == 'l')) | |
188 | ||
454866e0 | 189 | /* Read an SCSH block comment. */ |
620c8965 LC |
190 | static inline SCM scm_read_scsh_block_comment (scm_t_wchar, SCM); |
191 | static SCM scm_read_r6rs_block_comment (scm_t_wchar, SCM); | |
192 | static SCM scm_read_commented_expression (scm_t_wchar, SCM); | |
193 | static SCM scm_get_hash_procedure (int); | |
454866e0 | 194 | |
69f90b0b MG |
195 | /* Read from PORT until a delimiter (e.g., a whitespace) is read. Put the |
196 | result in the pre-allocated buffer BUF. Return zero if the whole token has | |
197 | fewer than BUF_SIZE bytes, non-zero otherwise. READ will be set the number of | |
198 | bytes actually read. */ | |
7337d56d | 199 | static inline int |
69f90b0b MG |
200 | read_token (SCM port, char *buf, const size_t buf_size, size_t *read) |
201 | { | |
202 | *read = 0; | |
0520c320 | 203 | |
69f90b0b MG |
204 | while (*read < buf_size) |
205 | { | |
206 | int chr; | |
7337d56d | 207 | |
69f90b0b | 208 | chr = scm_get_byte_or_eof (port); |
889975e5 | 209 | |
69f90b0b MG |
210 | if (chr == EOF) |
211 | return 0; | |
212 | else if (CHAR_IS_DELIMITER (chr)) | |
213 | { | |
214 | scm_unget_byte (chr, port); | |
215 | return 0; | |
216 | } | |
217 | else | |
218 | { | |
219 | *buf = (char) chr; | |
220 | buf++, (*read)++; | |
221 | } | |
222 | } | |
889975e5 | 223 | |
69f90b0b MG |
224 | return 1; |
225 | } | |
889975e5 | 226 | |
69f90b0b MG |
227 | /* Read from PORT until a delimiter (e.g., a whitespace) is read. Put the |
228 | result in the pre-allocated buffer BUFFER, if the whole token has fewer than | |
229 | BUFFER_SIZE bytes, or into OVERFLOW_BUFFER, allocated here to be freed by the | |
230 | caller. Return zero if the token fits in BUFFER, non-zero otherwise. READ | |
231 | will be set the number of bytes actually read. */ | |
232 | static int | |
233 | read_complete_token (SCM port, char *buffer, const size_t buffer_size, | |
234 | char **overflow_buffer, size_t *read) | |
235 | { | |
236 | int overflow = 0; | |
237 | size_t bytes_read, overflow_size; | |
7337d56d | 238 | |
69f90b0b MG |
239 | *overflow_buffer = NULL; |
240 | overflow_size = 0; | |
1cc91f1b | 241 | |
69f90b0b MG |
242 | do |
243 | { | |
244 | overflow = read_token (port, buffer, buffer_size, &bytes_read); | |
245 | if (bytes_read == 0) | |
246 | break; | |
247 | if (overflow || overflow_size != 0) | |
248 | { | |
249 | if (overflow_size == 0) | |
250 | { | |
251 | *overflow_buffer = scm_malloc (bytes_read); | |
252 | memcpy (*overflow_buffer, buffer, bytes_read); | |
253 | overflow_size = bytes_read; | |
254 | } | |
255 | else | |
256 | { | |
257 | *overflow_buffer = scm_realloc (*overflow_buffer, overflow_size + bytes_read); | |
258 | memcpy (*overflow_buffer + overflow_size, buffer, bytes_read); | |
259 | overflow_size += bytes_read; | |
260 | } | |
261 | } | |
889975e5 | 262 | } |
69f90b0b | 263 | while (overflow); |
889975e5 | 264 | |
69f90b0b MG |
265 | if (overflow_size) |
266 | *read = overflow_size; | |
b521d265 | 267 | else |
69f90b0b MG |
268 | *read = bytes_read; |
269 | ||
270 | return (overflow_size != 0); | |
889975e5 | 271 | } |
7337d56d LC |
272 | |
273 | /* Skip whitespace from PORT and return the first non-whitespace character | |
274 | read. Raise an error on end-of-file. */ | |
275 | static int | |
276 | flush_ws (SCM port, const char *eoferr) | |
0f2d19dd | 277 | { |
889975e5 | 278 | register scm_t_wchar c; |
0f2d19dd | 279 | while (1) |
b7f3516f | 280 | switch (c = scm_getc (port)) |
0f2d19dd JB |
281 | { |
282 | case EOF: | |
283 | goteof: | |
284 | if (eoferr) | |
d156d3b7 | 285 | { |
a4022e69 MV |
286 | scm_i_input_error (eoferr, |
287 | port, | |
288 | "end of file", | |
289 | SCM_EOL); | |
d156d3b7 | 290 | } |
0f2d19dd | 291 | return c; |
7337d56d | 292 | |
0f2d19dd JB |
293 | case ';': |
294 | lp: | |
b7f3516f | 295 | switch (c = scm_getc (port)) |
0f2d19dd JB |
296 | { |
297 | case EOF: | |
298 | goto goteof; | |
299 | default: | |
300 | goto lp; | |
301 | case SCM_LINE_INCREMENTORS: | |
302 | break; | |
303 | } | |
304 | break; | |
7337d56d | 305 | |
454866e0 LC |
306 | case '#': |
307 | switch (c = scm_getc (port)) | |
308 | { | |
309 | case EOF: | |
310 | eoferr = "read_sharp"; | |
311 | goto goteof; | |
312 | case '!': | |
313 | scm_read_scsh_block_comment (c, port); | |
314 | break; | |
34f3d47d AW |
315 | case ';': |
316 | scm_read_commented_expression (c, port); | |
317 | break; | |
620c8965 LC |
318 | case '|': |
319 | if (scm_is_false (scm_get_hash_procedure (c))) | |
320 | { | |
321 | scm_read_r6rs_block_comment (c, port); | |
322 | break; | |
323 | } | |
324 | /* fall through */ | |
454866e0 LC |
325 | default: |
326 | scm_ungetc (c, port); | |
327 | return '#'; | |
328 | } | |
329 | break; | |
330 | ||
0f2d19dd | 331 | case SCM_LINE_INCREMENTORS: |
0f2d19dd | 332 | case SCM_SINGLE_SPACES: |
0f2d19dd | 333 | case '\t': |
0f2d19dd | 334 | break; |
7337d56d | 335 | |
0f2d19dd JB |
336 | default: |
337 | return c; | |
338 | } | |
7337d56d LC |
339 | |
340 | return 0; | |
0f2d19dd JB |
341 | } |
342 | ||
343 | ||
7337d56d LC |
344 | \f |
345 | /* Token readers. */ | |
1cc91f1b | 346 | |
7337d56d LC |
347 | static SCM scm_read_expression (SCM port); |
348 | static SCM scm_read_sharp (int chr, SCM port); | |
7337d56d | 349 | static SCM recsexpr (SCM obj, long line, int column, SCM filename); |
0f2d19dd JB |
350 | |
351 | ||
09a4f039 | 352 | static SCM |
889975e5 | 353 | scm_read_sexp (scm_t_wchar chr, SCM port) |
7337d56d | 354 | #define FUNC_NAME "scm_i_lreadparen" |
09a4f039 | 355 | { |
7337d56d LC |
356 | register int c; |
357 | register SCM tmp; | |
358 | register SCM tl, ans = SCM_EOL; | |
bd22f1c7 | 359 | SCM tl2 = SCM_EOL, ans2 = SCM_EOL, copy = SCM_BOOL_F; |
5afa815c | 360 | const int terminating_char = ((chr == '[') ? ']' : ')'); |
7337d56d LC |
361 | |
362 | /* Need to capture line and column numbers here. */ | |
363 | long line = SCM_LINUM (port); | |
364 | int column = SCM_COL (port) - 1; | |
f9c68a47 | 365 | |
f9c68a47 | 366 | |
7337d56d LC |
367 | c = flush_ws (port, FUNC_NAME); |
368 | if (terminating_char == c) | |
369 | return SCM_EOL; | |
f9c68a47 | 370 | |
7337d56d LC |
371 | scm_ungetc (c, port); |
372 | if (scm_is_eq (scm_sym_dot, | |
373 | (tmp = scm_read_expression (port)))) | |
374 | { | |
375 | ans = scm_read_expression (port); | |
376 | if (terminating_char != (c = flush_ws (port, FUNC_NAME))) | |
377 | scm_i_input_error (FUNC_NAME, port, "missing close paren", | |
378 | SCM_EOL); | |
379 | return ans; | |
380 | } | |
1cc91f1b | 381 | |
7337d56d LC |
382 | /* Build the head of the list structure. */ |
383 | ans = tl = scm_cons (tmp, SCM_EOL); | |
384 | ||
385 | if (SCM_COPY_SOURCE_P) | |
386 | ans2 = tl2 = scm_cons (scm_is_pair (tmp) | |
387 | ? copy | |
388 | : tmp, | |
389 | SCM_EOL); | |
390 | ||
391 | while (terminating_char != (c = flush_ws (port, FUNC_NAME))) | |
0f2d19dd | 392 | { |
7337d56d | 393 | SCM new_tail; |
0f2d19dd | 394 | |
7337d56d LC |
395 | scm_ungetc (c, port); |
396 | if (scm_is_eq (scm_sym_dot, | |
397 | (tmp = scm_read_expression (port)))) | |
0f2d19dd | 398 | { |
7337d56d LC |
399 | SCM_SETCDR (tl, tmp = scm_read_expression (port)); |
400 | ||
401 | if (SCM_COPY_SOURCE_P) | |
402 | SCM_SETCDR (tl2, scm_cons (scm_is_pair (tmp) ? copy : tmp, | |
403 | SCM_EOL)); | |
404 | ||
405 | c = flush_ws (port, FUNC_NAME); | |
406 | if (terminating_char != c) | |
407 | scm_i_input_error (FUNC_NAME, port, | |
408 | "in pair: missing close paren", SCM_EOL); | |
409 | goto exit; | |
0f2d19dd | 410 | } |
b858464a | 411 | |
7337d56d LC |
412 | new_tail = scm_cons (tmp, SCM_EOL); |
413 | SCM_SETCDR (tl, new_tail); | |
414 | tl = new_tail; | |
415 | ||
416 | if (SCM_COPY_SOURCE_P) | |
0f2d19dd | 417 | { |
7337d56d LC |
418 | SCM new_tail2 = scm_cons (scm_is_pair (tmp) |
419 | ? copy | |
420 | : tmp, SCM_EOL); | |
421 | SCM_SETCDR (tl2, new_tail2); | |
422 | tl2 = new_tail2; | |
423 | } | |
424 | } | |
0f2d19dd | 425 | |
7337d56d LC |
426 | exit: |
427 | if (SCM_RECORD_POSITIONS_P) | |
428 | scm_whash_insert (scm_source_whash, | |
429 | ans, | |
430 | scm_make_srcprops (line, column, | |
431 | SCM_FILENAME (port), | |
432 | SCM_COPY_SOURCE_P | |
433 | ? ans2 | |
434 | : SCM_UNDEFINED, | |
435 | SCM_EOL)); | |
436 | return ans; | |
437 | } | |
438 | #undef FUNC_NAME | |
a4022e69 | 439 | |
c5661d28 MG |
440 | |
441 | /* Read a hexadecimal number NDIGITS in length. Put its value into the variable | |
dea901d6 MG |
442 | C. If TERMINATOR is non-null, terminate early if the TERMINATOR character is |
443 | found. */ | |
444 | #define SCM_READ_HEX_ESCAPE(ndigits, terminator) \ | |
445 | do \ | |
446 | { \ | |
447 | scm_t_wchar a; \ | |
448 | size_t i = 0; \ | |
449 | c = 0; \ | |
450 | while (i < ndigits) \ | |
451 | { \ | |
452 | a = scm_getc (port); \ | |
453 | if (a == EOF) \ | |
454 | goto str_eof; \ | |
455 | if (terminator \ | |
456 | && (a == (scm_t_wchar) terminator) \ | |
457 | && (i > 0)) \ | |
458 | break; \ | |
459 | if ('0' <= a && a <= '9') \ | |
460 | a -= '0'; \ | |
461 | else if ('A' <= a && a <= 'F') \ | |
462 | a = a - 'A' + 10; \ | |
463 | else if ('a' <= a && a <= 'f') \ | |
464 | a = a - 'a' + 10; \ | |
465 | else \ | |
466 | { \ | |
467 | c = a; \ | |
468 | goto bad_escaped; \ | |
469 | } \ | |
470 | c = c * 16 + a; \ | |
471 | i ++; \ | |
472 | } \ | |
c5661d28 MG |
473 | } while (0) |
474 | ||
7337d56d LC |
475 | static SCM |
476 | scm_read_string (int chr, SCM port) | |
477 | #define FUNC_NAME "scm_lreadr" | |
478 | { | |
479 | /* For strings smaller than C_STR, this function creates only one Scheme | |
480 | object (the string returned). */ | |
0f2d19dd | 481 | |
7337d56d | 482 | SCM str = SCM_BOOL_F; |
7337d56d | 483 | unsigned c_str_len = 0; |
9c44cd45 | 484 | scm_t_wchar c; |
eb42ff25 | 485 | |
9c44cd45 | 486 | str = scm_i_make_string (READER_STRING_BUFFER_SIZE, NULL); |
7337d56d LC |
487 | while ('"' != (c = scm_getc (port))) |
488 | { | |
489 | if (c == EOF) | |
9c44cd45 MG |
490 | { |
491 | str_eof: | |
492 | scm_i_input_error (FUNC_NAME, port, | |
493 | "end of file in string constant", SCM_EOL); | |
494 | } | |
0f2d19dd | 495 | |
9c44cd45 MG |
496 | if (c_str_len + 1 >= scm_i_string_length (str)) |
497 | { | |
498 | SCM addy = scm_i_make_string (READER_STRING_BUFFER_SIZE, NULL); | |
0f2d19dd | 499 | |
9c44cd45 MG |
500 | str = scm_string_append (scm_list_2 (str, addy)); |
501 | } | |
0f2d19dd | 502 | |
7337d56d | 503 | if (c == '\\') |
9c44cd45 MG |
504 | { |
505 | switch (c = scm_getc (port)) | |
506 | { | |
507 | case EOF: | |
508 | goto str_eof; | |
509 | case '"': | |
510 | case '\\': | |
511 | break; | |
16353acc | 512 | #if SCM_ENABLE_ELISP |
9c44cd45 MG |
513 | case '(': |
514 | case ')': | |
515 | if (SCM_ESCAPED_PARENS_P) | |
516 | break; | |
517 | goto bad_escaped; | |
16353acc | 518 | #endif |
9c44cd45 MG |
519 | case '\n': |
520 | continue; | |
521 | case '0': | |
522 | c = '\0'; | |
523 | break; | |
524 | case 'f': | |
525 | c = '\f'; | |
526 | break; | |
527 | case 'n': | |
528 | c = '\n'; | |
529 | break; | |
530 | case 'r': | |
531 | c = '\r'; | |
532 | break; | |
533 | case 't': | |
534 | c = '\t'; | |
535 | break; | |
536 | case 'a': | |
537 | c = '\007'; | |
538 | break; | |
539 | case 'v': | |
540 | c = '\v'; | |
541 | break; | |
67a4a16d MG |
542 | case 'b': |
543 | c = '\010'; | |
544 | break; | |
9c44cd45 | 545 | case 'x': |
dea901d6 MG |
546 | if (SCM_R6RS_ESCAPES_P) |
547 | SCM_READ_HEX_ESCAPE (10, ';'); | |
548 | else | |
549 | SCM_READ_HEX_ESCAPE (2, '\0'); | |
c5661d28 | 550 | break; |
9c44cd45 | 551 | case 'u': |
898a0b5a MG |
552 | if (!SCM_R6RS_ESCAPES_P) |
553 | { | |
554 | SCM_READ_HEX_ESCAPE (4, '\0'); | |
555 | break; | |
556 | } | |
9c44cd45 | 557 | case 'U': |
898a0b5a MG |
558 | if (!SCM_R6RS_ESCAPES_P) |
559 | { | |
560 | SCM_READ_HEX_ESCAPE (6, '\0'); | |
561 | break; | |
562 | } | |
9c44cd45 MG |
563 | default: |
564 | bad_escaped: | |
565 | scm_i_input_error (FUNC_NAME, port, | |
566 | "illegal character in escape sequence: ~S", | |
567 | scm_list_1 (SCM_MAKE_CHAR (c))); | |
568 | } | |
569 | } | |
570 | str = scm_i_string_start_writing (str); | |
571 | scm_i_string_set_x (str, c_str_len++, c); | |
572 | scm_i_string_stop_writing (); | |
7337d56d | 573 | } |
f13b4400 | 574 | |
7337d56d LC |
575 | if (c_str_len > 0) |
576 | { | |
9c44cd45 | 577 | return scm_i_substring_copy (str, 0, c_str_len); |
0f2d19dd | 578 | } |
69f90b0b | 579 | |
9c44cd45 | 580 | return scm_nullstr; |
0f2d19dd | 581 | } |
db4b4ca6 DH |
582 | #undef FUNC_NAME |
583 | ||
0f2d19dd | 584 | |
7337d56d | 585 | static SCM |
889975e5 | 586 | scm_read_number (scm_t_wchar chr, SCM port) |
0f2d19dd | 587 | { |
69f90b0b MG |
588 | SCM result, str = SCM_EOL; |
589 | char buffer[READER_BUFFER_SIZE]; | |
590 | char *overflow_buffer = NULL; | |
591 | size_t bytes_read; | |
592 | int overflow; | |
593 | scm_t_port *pt = SCM_PTAB_ENTRY (port); | |
0f2d19dd | 594 | |
7337d56d | 595 | scm_ungetc (chr, port); |
69f90b0b MG |
596 | overflow = read_complete_token (port, buffer, sizeof (buffer), |
597 | &overflow_buffer, &bytes_read); | |
598 | ||
599 | if (!overflow) | |
600 | str = scm_from_stringn (buffer, bytes_read, pt->encoding, pt->ilseq_handler); | |
601 | else | |
602 | str = scm_from_stringn (overflow_buffer, bytes_read, pt->encoding, | |
603 | pt->ilseq_handler); | |
604 | ||
605 | result = scm_string_to_number (str, SCM_UNDEFINED); | |
889975e5 | 606 | if (!scm_is_true (result)) |
69f90b0b MG |
607 | { |
608 | /* Return a symbol instead of a number */ | |
609 | if (SCM_CASE_INSENSITIVE_P) | |
610 | str = scm_string_downcase_x (str); | |
611 | result = scm_string_to_symbol (str); | |
612 | } | |
0f2d19dd | 613 | |
69f90b0b MG |
614 | if (overflow) |
615 | free (overflow_buffer); | |
616 | SCM_COL (port) += scm_i_string_length (str); | |
7337d56d LC |
617 | return result; |
618 | } | |
0f2d19dd | 619 | |
7337d56d | 620 | static SCM |
889975e5 | 621 | scm_read_mixed_case_symbol (scm_t_wchar chr, SCM port) |
7337d56d | 622 | { |
889975e5 MG |
623 | SCM result; |
624 | int ends_with_colon = 0; | |
69f90b0b | 625 | size_t bytes_read; |
ef4cbc08 | 626 | int postfix = scm_is_eq (SCM_PACK (SCM_KEYWORD_STYLE), scm_keyword_postfix); |
69f90b0b MG |
627 | int overflow; |
628 | char buffer[READER_BUFFER_SIZE], *overflow_buffer; | |
629 | scm_t_port *pt = SCM_PTAB_ENTRY (port); | |
630 | SCM str; | |
7337d56d LC |
631 | |
632 | scm_ungetc (chr, port); | |
69f90b0b MG |
633 | overflow = read_complete_token (port, buffer, READER_BUFFER_SIZE, |
634 | &overflow_buffer, &bytes_read); | |
635 | if (bytes_read > 0) | |
636 | { | |
637 | if (!overflow) | |
638 | ends_with_colon = buffer[bytes_read - 1] == ':'; | |
639 | else | |
640 | ends_with_colon = overflow_buffer[bytes_read - 1] == ':'; | |
641 | } | |
ef4cbc08 | 642 | |
69f90b0b MG |
643 | if (postfix && ends_with_colon && (bytes_read > 1)) |
644 | { | |
645 | if (!overflow) | |
646 | str = scm_from_stringn (buffer, bytes_read - 1, pt->encoding, pt->ilseq_handler); | |
647 | else | |
648 | str = scm_from_stringn (overflow_buffer, bytes_read - 1, pt->encoding, | |
649 | pt->ilseq_handler); | |
650 | ||
651 | if (SCM_CASE_INSENSITIVE_P) | |
652 | str = scm_string_downcase_x (str); | |
653 | result = scm_symbol_to_keyword (scm_string_to_symbol (str)); | |
654 | } | |
7337d56d | 655 | else |
69f90b0b MG |
656 | { |
657 | if (!overflow) | |
658 | str = scm_from_stringn (buffer, bytes_read, pt->encoding, pt->ilseq_handler); | |
659 | else | |
660 | str = scm_from_stringn (overflow_buffer, bytes_read, pt->encoding, | |
661 | pt->ilseq_handler); | |
662 | ||
663 | if (SCM_CASE_INSENSITIVE_P) | |
664 | str = scm_string_downcase_x (str); | |
665 | result = scm_string_to_symbol (str); | |
666 | } | |
7337d56d | 667 | |
69f90b0b MG |
668 | if (overflow) |
669 | free (overflow_buffer); | |
670 | SCM_COL (port) += scm_i_string_length (str); | |
7337d56d LC |
671 | return result; |
672 | } | |
673 | ||
674 | static SCM | |
889975e5 | 675 | scm_read_number_and_radix (scm_t_wchar chr, SCM port) |
7337d56d LC |
676 | #define FUNC_NAME "scm_lreadr" |
677 | { | |
889975e5 | 678 | SCM result; |
7337d56d | 679 | size_t read; |
69f90b0b MG |
680 | char buffer[READER_BUFFER_SIZE], *overflow_buffer; |
681 | int overflow; | |
7337d56d | 682 | unsigned int radix; |
69f90b0b MG |
683 | SCM str; |
684 | scm_t_port *pt; | |
7337d56d LC |
685 | |
686 | switch (chr) | |
687 | { | |
688 | case 'B': | |
689 | case 'b': | |
690 | radix = 2; | |
691 | break; | |
692 | ||
693 | case 'o': | |
694 | case 'O': | |
695 | radix = 8; | |
696 | break; | |
697 | ||
698 | case 'd': | |
699 | case 'D': | |
700 | radix = 10; | |
701 | break; | |
702 | ||
703 | case 'x': | |
704 | case 'X': | |
705 | radix = 16; | |
706 | break; | |
707 | ||
708 | default: | |
709 | scm_ungetc (chr, port); | |
710 | scm_ungetc ('#', port); | |
711 | radix = 10; | |
712 | } | |
713 | ||
69f90b0b MG |
714 | overflow = read_complete_token (port, buffer, sizeof (buffer), |
715 | &overflow_buffer, &read); | |
716 | ||
717 | pt = SCM_PTAB_ENTRY (port); | |
718 | if (!overflow) | |
719 | str = scm_from_stringn (buffer, read, pt->encoding, pt->ilseq_handler); | |
720 | else | |
721 | str = scm_from_stringn (overflow_buffer, read, pt->encoding, | |
722 | pt->ilseq_handler); | |
723 | ||
724 | result = scm_string_to_number (str, scm_from_uint (radix)); | |
725 | ||
726 | if (overflow) | |
727 | free (overflow_buffer); | |
728 | ||
729 | SCM_COL (port) += scm_i_string_length (str); | |
7337d56d LC |
730 | |
731 | if (scm_is_true (result)) | |
732 | return result; | |
733 | ||
734 | scm_i_input_error (FUNC_NAME, port, "unknown # object", SCM_EOL); | |
735 | ||
736 | return SCM_BOOL_F; | |
737 | } | |
738 | #undef FUNC_NAME | |
739 | ||
740 | static SCM | |
741 | scm_read_quote (int chr, SCM port) | |
742 | { | |
743 | SCM p; | |
492faee1 LC |
744 | long line = SCM_LINUM (port); |
745 | int column = SCM_COL (port) - 1; | |
7337d56d LC |
746 | |
747 | switch (chr) | |
748 | { | |
749 | case '`': | |
750 | p = scm_sym_quasiquote; | |
751 | break; | |
752 | ||
753 | case '\'': | |
754 | p = scm_sym_quote; | |
755 | break; | |
756 | ||
757 | case ',': | |
758 | { | |
889975e5 | 759 | scm_t_wchar c; |
7337d56d LC |
760 | |
761 | c = scm_getc (port); | |
762 | if ('@' == c) | |
763 | p = scm_sym_uq_splicing; | |
764 | else | |
0f2d19dd | 765 | { |
7337d56d LC |
766 | scm_ungetc (c, port); |
767 | p = scm_sym_unquote; | |
0f2d19dd | 768 | } |
7337d56d LC |
769 | break; |
770 | } | |
0f2d19dd | 771 | |
7337d56d LC |
772 | default: |
773 | fprintf (stderr, "%s: unhandled quote character (%i)\n", | |
7f74cf9a | 774 | "scm_read_quote", chr); |
7337d56d | 775 | abort (); |
0f2d19dd | 776 | } |
1cc91f1b | 777 | |
7337d56d | 778 | p = scm_cons2 (p, scm_read_expression (port), SCM_EOL); |
492faee1 LC |
779 | if (SCM_RECORD_POSITIONS_P) |
780 | scm_whash_insert (scm_source_whash, p, | |
781 | scm_make_srcprops (line, column, | |
782 | SCM_FILENAME (port), | |
783 | SCM_COPY_SOURCE_P | |
784 | ? (scm_cons2 (SCM_CAR (p), | |
785 | SCM_CAR (SCM_CDR (p)), | |
786 | SCM_EOL)) | |
787 | : SCM_UNDEFINED, | |
788 | SCM_EOL)); | |
789 | ||
0f2d19dd | 790 | |
7337d56d LC |
791 | return p; |
792 | } | |
793 | ||
34f3d47d AW |
794 | SCM_SYMBOL (sym_syntax, "syntax"); |
795 | SCM_SYMBOL (sym_quasisyntax, "quasisyntax"); | |
796 | SCM_SYMBOL (sym_unsyntax, "unsyntax"); | |
797 | SCM_SYMBOL (sym_unsyntax_splicing, "unsyntax-splicing"); | |
798 | ||
799 | static SCM | |
800 | scm_read_syntax (int chr, SCM port) | |
801 | { | |
802 | SCM p; | |
803 | long line = SCM_LINUM (port); | |
804 | int column = SCM_COL (port) - 1; | |
805 | ||
806 | switch (chr) | |
807 | { | |
808 | case '`': | |
809 | p = sym_quasisyntax; | |
810 | break; | |
811 | ||
812 | case '\'': | |
813 | p = sym_syntax; | |
814 | break; | |
815 | ||
816 | case ',': | |
817 | { | |
818 | int c; | |
819 | ||
820 | c = scm_getc (port); | |
821 | if ('@' == c) | |
822 | p = sym_unsyntax_splicing; | |
823 | else | |
824 | { | |
825 | scm_ungetc (c, port); | |
826 | p = sym_unsyntax; | |
827 | } | |
828 | break; | |
829 | } | |
830 | ||
831 | default: | |
832 | fprintf (stderr, "%s: unhandled syntax character (%i)\n", | |
833 | "scm_read_syntax", chr); | |
834 | abort (); | |
835 | } | |
836 | ||
837 | p = scm_cons2 (p, scm_read_expression (port), SCM_EOL); | |
838 | if (SCM_RECORD_POSITIONS_P) | |
839 | scm_whash_insert (scm_source_whash, p, | |
840 | scm_make_srcprops (line, column, | |
841 | SCM_FILENAME (port), | |
842 | SCM_COPY_SOURCE_P | |
843 | ? (scm_cons2 (SCM_CAR (p), | |
844 | SCM_CAR (SCM_CDR (p)), | |
845 | SCM_EOL)) | |
846 | : SCM_UNDEFINED, | |
847 | SCM_EOL)); | |
848 | ||
849 | ||
850 | return p; | |
851 | } | |
852 | ||
7337d56d LC |
853 | static inline SCM |
854 | scm_read_semicolon_comment (int chr, SCM port) | |
0f2d19dd | 855 | { |
0f2d19dd JB |
856 | int c; |
857 | ||
889975e5 MG |
858 | /* We use the get_byte here because there is no need to get the |
859 | locale correct with comment input. This presumes that newline | |
860 | always represents itself no matter what the encoding is. */ | |
861 | for (c = scm_get_byte_or_eof (port); | |
7337d56d | 862 | (c != EOF) && (c != '\n'); |
8a8da78d | 863 | c = scm_get_byte_or_eof (port)); |
7337d56d LC |
864 | |
865 | return SCM_UNSPECIFIED; | |
866 | } | |
867 | ||
868 | \f | |
869 | /* Sharp readers, i.e. readers called after a `#' sign has been read. */ | |
870 | ||
871 | static SCM | |
872 | scm_read_boolean (int chr, SCM port) | |
873 | { | |
874 | switch (chr) | |
0f2d19dd | 875 | { |
7337d56d LC |
876 | case 't': |
877 | case 'T': | |
878 | return SCM_BOOL_T; | |
879 | ||
880 | case 'f': | |
881 | case 'F': | |
882 | return SCM_BOOL_F; | |
0f2d19dd | 883 | } |
7337d56d LC |
884 | |
885 | return SCM_UNSPECIFIED; | |
886 | } | |
887 | ||
888 | static SCM | |
889975e5 | 889 | scm_read_character (scm_t_wchar chr, SCM port) |
7337d56d LC |
890 | #define FUNC_NAME "scm_lreadr" |
891 | { | |
69f90b0b MG |
892 | char buffer[READER_CHAR_NAME_MAX_SIZE]; |
893 | SCM charname; | |
894 | size_t charname_len, bytes_read; | |
889975e5 MG |
895 | scm_t_wchar cp; |
896 | int overflow; | |
69f90b0b | 897 | scm_t_port *pt; |
889975e5 | 898 | |
69f90b0b | 899 | overflow = read_token (port, buffer, READER_CHAR_NAME_MAX_SIZE, &bytes_read); |
889975e5 | 900 | if (overflow) |
7337d56d LC |
901 | goto char_error; |
902 | ||
69f90b0b | 903 | if (bytes_read == 0) |
0f2d19dd | 904 | { |
7337d56d LC |
905 | chr = scm_getc (port); |
906 | if (chr == EOF) | |
907 | scm_i_input_error (FUNC_NAME, port, "unexpected end of file " | |
908 | "while reading character", SCM_EOL); | |
909 | ||
910 | /* CHR must be a token delimiter, like a whitespace. */ | |
911 | return (SCM_MAKE_CHAR (chr)); | |
0f2d19dd | 912 | } |
7337d56d | 913 | |
69f90b0b | 914 | pt = SCM_PTAB_ENTRY (port); |
7337d56d | 915 | |
69f90b0b MG |
916 | /* Simple ASCII characters can be processed immediately. Also, simple |
917 | ISO-8859-1 characters can be processed immediately if the encoding for this | |
918 | port is ISO-8859-1. */ | |
919 | if (bytes_read == 1 && ((unsigned char) buffer[0] <= 127 || pt->encoding == NULL)) | |
920 | { | |
921 | SCM_COL (port) += 1; | |
922 | return SCM_MAKE_CHAR (buffer[0]); | |
923 | } | |
924 | ||
925 | /* Otherwise, convert the buffer into a proper scheme string for | |
926 | processing. */ | |
927 | charname = scm_from_stringn (buffer, bytes_read, pt->encoding, | |
928 | pt->ilseq_handler); | |
929 | charname_len = scm_i_string_length (charname); | |
930 | SCM_COL (port) += charname_len; | |
889975e5 | 931 | cp = scm_i_string_ref (charname, 0); |
69f90b0b MG |
932 | if (charname_len == 1) |
933 | return SCM_MAKE_CHAR (cp); | |
934 | ||
935 | /* Ignore dotted circles, which may be used to keep combining characters from | |
936 | combining with the backslash in #\charname. */ | |
0dcd7e61 MG |
937 | if (cp == SCM_CODEPOINT_DOTTED_CIRCLE && charname_len == 2) |
938 | return SCM_MAKE_CHAR (scm_i_string_ref (charname, 1)); | |
939 | ||
889975e5 | 940 | if (cp >= '0' && cp < '8') |
7337d56d LC |
941 | { |
942 | /* Dirk:FIXME:: This type of character syntax is not R5RS | |
943 | * compliant. Further, it should be verified that the constant | |
0ffc78e3 | 944 | * does only consist of octal digits. */ |
889975e5 | 945 | SCM p = scm_string_to_number (charname, scm_from_uint (8)); |
7337d56d | 946 | if (SCM_I_INUMP (p)) |
0ffc78e3 MG |
947 | { |
948 | scm_t_wchar c = SCM_I_INUM (p); | |
949 | if (SCM_IS_UNICODE_CHAR (c)) | |
950 | return SCM_MAKE_CHAR (c); | |
951 | else | |
952 | scm_i_input_error (FUNC_NAME, port, | |
953 | "out-of-range octal character escape: ~a", | |
954 | scm_list_1 (charname)); | |
955 | } | |
7337d56d LC |
956 | } |
957 | ||
dea901d6 MG |
958 | if (cp == 'x' && (charname_len > 1) && SCM_R6RS_ESCAPES_P) |
959 | { | |
960 | SCM p; | |
dea901d6 MG |
961 | |
962 | /* Convert from hex, skipping the initial 'x' character in CHARNAME */ | |
963 | p = scm_string_to_number (scm_c_substring (charname, 1, charname_len), | |
964 | scm_from_uint (16)); | |
965 | if (SCM_I_INUMP (p)) | |
966 | { | |
967 | scm_t_wchar c = SCM_I_INUM (p); | |
968 | if (SCM_IS_UNICODE_CHAR (c)) | |
969 | return SCM_MAKE_CHAR (c); | |
970 | else | |
971 | scm_i_input_error (FUNC_NAME, port, | |
972 | "out-of-range hex character escape: ~a", | |
973 | scm_list_1 (charname)); | |
974 | } | |
975 | } | |
976 | ||
889975e5 MG |
977 | /* The names of characters should never have non-Latin1 |
978 | characters. */ | |
979 | if (scm_i_is_narrow_string (charname) | |
980 | || scm_i_try_narrow_string (charname)) | |
4769c9db AW |
981 | { SCM ch = scm_i_charname_to_char (scm_i_string_chars (charname), |
982 | charname_len); | |
983 | if (scm_is_true (ch)) | |
984 | return ch; | |
985 | } | |
7337d56d LC |
986 | |
987 | char_error: | |
988 | scm_i_input_error (FUNC_NAME, port, "unknown character name ~a", | |
889975e5 | 989 | scm_list_1 (charname)); |
7337d56d LC |
990 | |
991 | return SCM_UNSPECIFIED; | |
0f2d19dd | 992 | } |
db4b4ca6 | 993 | #undef FUNC_NAME |
0f2d19dd | 994 | |
7337d56d LC |
995 | static inline SCM |
996 | scm_read_keyword (int chr, SCM port) | |
997 | { | |
998 | SCM symbol; | |
999 | ||
1000 | /* Read the symbol that comprises the keyword. Doing this instead of | |
1001 | invoking a specific symbol reader function allows `scm_read_keyword ()' | |
1002 | to adapt to the delimiters currently valid of symbols. | |
1cc91f1b | 1003 | |
7337d56d LC |
1004 | XXX: This implementation allows sloppy syntaxes like `#: key'. */ |
1005 | symbol = scm_read_expression (port); | |
1006 | if (!scm_is_symbol (symbol)) | |
7f74cf9a | 1007 | scm_i_input_error ("scm_read_keyword", port, |
7337d56d LC |
1008 | "keyword prefix `~a' not followed by a symbol: ~s", |
1009 | scm_list_2 (SCM_MAKE_CHAR (chr), symbol)); | |
1010 | ||
1011 | return (scm_symbol_to_keyword (symbol)); | |
1012 | } | |
1013 | ||
1014 | static inline SCM | |
1015 | scm_read_vector (int chr, SCM port) | |
09a4f039 | 1016 | { |
7337d56d LC |
1017 | /* Note: We call `scm_read_sexp ()' rather than READER here in order to |
1018 | guarantee that it's going to do what we want. After all, this is an | |
1019 | implementation detail of `scm_read_vector ()', not a desirable | |
1020 | property. */ | |
1021 | return (scm_vector (scm_read_sexp (chr, port))); | |
1022 | } | |
09a4f039 | 1023 | |
7337d56d LC |
1024 | static inline SCM |
1025 | scm_read_srfi4_vector (int chr, SCM port) | |
1026 | { | |
1027 | return scm_i_read_array (port, chr); | |
1028 | } | |
1029 | ||
0ba0b384 | 1030 | static SCM |
889975e5 | 1031 | scm_read_bytevector (scm_t_wchar chr, SCM port) |
0ba0b384 LC |
1032 | { |
1033 | chr = scm_getc (port); | |
1034 | if (chr != 'u') | |
1035 | goto syntax; | |
1036 | ||
1037 | chr = scm_getc (port); | |
1038 | if (chr != '8') | |
1039 | goto syntax; | |
1040 | ||
1041 | chr = scm_getc (port); | |
1042 | if (chr != '(') | |
1043 | goto syntax; | |
1044 | ||
1045 | return scm_u8_list_to_bytevector (scm_read_sexp (chr, port)); | |
1046 | ||
1047 | syntax: | |
1048 | scm_i_input_error ("read_bytevector", port, | |
1049 | "invalid bytevector prefix", | |
1050 | SCM_MAKE_CHAR (chr)); | |
1051 | return SCM_UNSPECIFIED; | |
1052 | } | |
1053 | ||
7337d56d | 1054 | static SCM |
889975e5 | 1055 | scm_read_guile_bit_vector (scm_t_wchar chr, SCM port) |
7337d56d LC |
1056 | { |
1057 | /* Read the `#*10101'-style read syntax for bit vectors in Guile. This is | |
1058 | terribly inefficient but who cares? */ | |
1059 | SCM s_bits = SCM_EOL; | |
1060 | ||
1061 | for (chr = scm_getc (port); | |
1062 | (chr != EOF) && ((chr == '0') || (chr == '1')); | |
1063 | chr = scm_getc (port)) | |
09a4f039 | 1064 | { |
7337d56d | 1065 | s_bits = scm_cons ((chr == '0') ? SCM_BOOL_F : SCM_BOOL_T, s_bits); |
09a4f039 | 1066 | } |
7337d56d LC |
1067 | |
1068 | if (chr != EOF) | |
1069 | scm_ungetc (chr, port); | |
1070 | ||
1071 | return scm_bitvector (scm_reverse_x (s_bits, SCM_EOL)); | |
1072 | } | |
1073 | ||
1074 | static inline SCM | |
889975e5 | 1075 | scm_read_scsh_block_comment (scm_t_wchar chr, SCM port) |
7337d56d LC |
1076 | { |
1077 | int bang_seen = 0; | |
1078 | ||
889975e5 MG |
1079 | /* We can use the get_byte here because there is no need to get the |
1080 | locale correct when reading comments. This presumes that | |
1081 | hash and exclamation points always represent themselves no | |
1082 | matter what the source encoding is.*/ | |
7337d56d | 1083 | for (;;) |
09a4f039 | 1084 | { |
889975e5 | 1085 | int c = scm_get_byte_or_eof (port); |
62850ef3 | 1086 | |
7337d56d LC |
1087 | if (c == EOF) |
1088 | scm_i_input_error ("skip_block_comment", port, | |
1089 | "unterminated `#! ... !#' comment", SCM_EOL); | |
1090 | ||
1091 | if (c == '!') | |
1092 | bang_seen = 1; | |
1093 | else if (c == '#' && bang_seen) | |
1094 | break; | |
1095 | else | |
1096 | bang_seen = 0; | |
1097 | } | |
1098 | ||
1099 | return SCM_UNSPECIFIED; | |
1100 | } | |
1101 | ||
620c8965 LC |
1102 | static SCM |
1103 | scm_read_r6rs_block_comment (scm_t_wchar chr, SCM port) | |
1104 | { | |
1105 | /* Unlike SCSH-style block comments, SRFI-30/R6RS block comments may be | |
1106 | nested. So care must be taken. */ | |
1107 | int nesting_level = 1; | |
1108 | int opening_seen = 0, closing_seen = 0; | |
1109 | ||
1110 | while (nesting_level > 0) | |
1111 | { | |
1112 | int c = scm_getc (port); | |
1113 | ||
1114 | if (c == EOF) | |
cd169c5a | 1115 | scm_i_input_error ("scm_read_r6rs_block_comment", port, |
620c8965 LC |
1116 | "unterminated `#| ... |#' comment", SCM_EOL); |
1117 | ||
1118 | if (opening_seen) | |
1119 | { | |
1120 | if (c == '|') | |
1121 | nesting_level++; | |
1122 | opening_seen = 0; | |
1123 | } | |
1124 | else if (closing_seen) | |
1125 | { | |
1126 | if (c == '#') | |
1127 | nesting_level--; | |
1128 | closing_seen = 0; | |
1129 | } | |
1130 | else if (c == '|') | |
1131 | closing_seen = 1; | |
1132 | else if (c == '#') | |
1133 | opening_seen = 1; | |
1134 | else | |
1135 | opening_seen = closing_seen = 0; | |
1136 | } | |
1137 | ||
1138 | return SCM_UNSPECIFIED; | |
1139 | } | |
1140 | ||
34f3d47d | 1141 | static SCM |
889975e5 | 1142 | scm_read_commented_expression (scm_t_wchar chr, SCM port) |
34f3d47d | 1143 | { |
889975e5 | 1144 | scm_t_wchar c; |
34f3d47d AW |
1145 | |
1146 | c = flush_ws (port, (char *) NULL); | |
1147 | if (EOF == c) | |
1148 | scm_i_input_error ("read_commented_expression", port, | |
1149 | "no expression after #; comment", SCM_EOL); | |
1150 | scm_ungetc (c, port); | |
1151 | scm_read_expression (port); | |
1152 | return SCM_UNSPECIFIED; | |
1153 | } | |
1154 | ||
7337d56d | 1155 | static SCM |
889975e5 | 1156 | scm_read_extended_symbol (scm_t_wchar chr, SCM port) |
7337d56d LC |
1157 | { |
1158 | /* Guile's extended symbol read syntax looks like this: | |
1159 | ||
1160 | #{This is all a symbol name}# | |
1161 | ||
1162 | So here, CHR is expected to be `{'. */ | |
7337d56d LC |
1163 | int saw_brace = 0, finished = 0; |
1164 | size_t len = 0; | |
889975e5 | 1165 | SCM buf = scm_i_make_string (1024, NULL); |
7337d56d | 1166 | |
889975e5 | 1167 | buf = scm_i_string_start_writing (buf); |
7337d56d LC |
1168 | |
1169 | while ((chr = scm_getc (port)) != EOF) | |
1170 | { | |
1171 | if (saw_brace) | |
09a4f039 | 1172 | { |
7337d56d LC |
1173 | if (chr == '#') |
1174 | { | |
1175 | finished = 1; | |
1176 | break; | |
1177 | } | |
1178 | else | |
1179 | { | |
1180 | saw_brace = 0; | |
889975e5 MG |
1181 | scm_i_string_set_x (buf, len++, '}'); |
1182 | scm_i_string_set_x (buf, len++, chr); | |
7337d56d | 1183 | } |
09a4f039 | 1184 | } |
7337d56d LC |
1185 | else if (chr == '}') |
1186 | saw_brace = 1; | |
1187 | else | |
889975e5 | 1188 | scm_i_string_set_x (buf, len++, chr); |
62850ef3 | 1189 | |
889975e5 | 1190 | if (len >= scm_i_string_length (buf) - 2) |
7337d56d | 1191 | { |
7f991c7d LC |
1192 | SCM addy; |
1193 | ||
889975e5 | 1194 | scm_i_string_stop_writing (); |
7f991c7d | 1195 | addy = scm_i_make_string (1024, NULL); |
889975e5 | 1196 | buf = scm_string_append (scm_list_2 (buf, addy)); |
7337d56d | 1197 | len = 0; |
889975e5 | 1198 | buf = scm_i_string_start_writing (buf); |
7337d56d | 1199 | } |
62850ef3 | 1200 | |
7337d56d LC |
1201 | if (finished) |
1202 | break; | |
1203 | } | |
889975e5 | 1204 | scm_i_string_stop_writing (); |
7337d56d | 1205 | |
889975e5 | 1206 | return (scm_string_to_symbol (scm_c_substring (buf, 0, len))); |
7337d56d LC |
1207 | } |
1208 | ||
1209 | ||
1210 | \f | |
1211 | /* Top-level token readers, i.e., dispatchers. */ | |
1212 | ||
1213 | static SCM | |
1214 | scm_read_sharp_extension (int chr, SCM port) | |
1215 | { | |
1216 | SCM proc; | |
1217 | ||
1218 | proc = scm_get_hash_procedure (chr); | |
1219 | if (scm_is_true (scm_procedure_p (proc))) | |
1220 | { | |
1221 | long line = SCM_LINUM (port); | |
1222 | int column = SCM_COL (port) - 2; | |
1223 | SCM got; | |
1224 | ||
1225 | got = scm_call_2 (proc, SCM_MAKE_CHAR (chr), port); | |
1226 | if (!scm_is_eq (got, SCM_UNSPECIFIED)) | |
62850ef3 | 1227 | { |
7337d56d LC |
1228 | if (SCM_RECORD_POSITIONS_P) |
1229 | return (recsexpr (got, line, column, | |
1230 | SCM_FILENAME (port))); | |
1231 | else | |
1232 | return got; | |
62850ef3 | 1233 | } |
09a4f039 | 1234 | } |
7337d56d LC |
1235 | |
1236 | return SCM_UNSPECIFIED; | |
1237 | } | |
1238 | ||
1239 | /* The reader for the sharp `#' character. It basically dispatches reads | |
1240 | among the above token readers. */ | |
1241 | static SCM | |
889975e5 | 1242 | scm_read_sharp (scm_t_wchar chr, SCM port) |
7337d56d LC |
1243 | #define FUNC_NAME "scm_lreadr" |
1244 | { | |
1245 | SCM result; | |
1246 | ||
1247 | chr = scm_getc (port); | |
1248 | ||
1249 | result = scm_read_sharp_extension (chr, port); | |
1250 | if (!scm_is_eq (result, SCM_UNSPECIFIED)) | |
1251 | return result; | |
1252 | ||
1253 | switch (chr) | |
1254 | { | |
1255 | case '\\': | |
1256 | return (scm_read_character (chr, port)); | |
1257 | case '(': | |
1258 | return (scm_read_vector (chr, port)); | |
1259 | case 's': | |
1260 | case 'u': | |
1261 | case 'f': | |
1262 | /* This one may return either a boolean or an SRFI-4 vector. */ | |
1263 | return (scm_read_srfi4_vector (chr, port)); | |
0ba0b384 LC |
1264 | case 'v': |
1265 | return (scm_read_bytevector (chr, port)); | |
7337d56d LC |
1266 | case '*': |
1267 | return (scm_read_guile_bit_vector (chr, port)); | |
1268 | case 't': | |
1269 | case 'T': | |
1270 | case 'F': | |
1271 | /* This one may return either a boolean or an SRFI-4 vector. */ | |
1272 | return (scm_read_boolean (chr, port)); | |
1273 | case ':': | |
1274 | return (scm_read_keyword (chr, port)); | |
1275 | case '0': case '1': case '2': case '3': case '4': | |
1276 | case '5': case '6': case '7': case '8': case '9': | |
1277 | case '@': | |
1278 | #if SCM_ENABLE_DEPRECATED | |
1279 | /* See below for 'i' and 'e'. */ | |
1280 | case 'a': | |
1281 | case 'c': | |
1282 | case 'y': | |
1283 | case 'h': | |
1284 | case 'l': | |
1285 | #endif | |
1286 | return (scm_i_read_array (port, chr)); | |
1287 | ||
1288 | case 'i': | |
1289 | case 'e': | |
1290 | #if SCM_ENABLE_DEPRECATED | |
1291 | { | |
1292 | /* When next char is '(', it really is an old-style | |
1293 | uniform array. */ | |
889975e5 | 1294 | scm_t_wchar next_c = scm_getc (port); |
7337d56d LC |
1295 | if (next_c != EOF) |
1296 | scm_ungetc (next_c, port); | |
1297 | if (next_c == '(') | |
1298 | return scm_i_read_array (port, chr); | |
1299 | /* Fall through. */ | |
1300 | } | |
1301 | #endif | |
1302 | case 'b': | |
1303 | case 'B': | |
1304 | case 'o': | |
1305 | case 'O': | |
1306 | case 'd': | |
1307 | case 'D': | |
1308 | case 'x': | |
1309 | case 'X': | |
1310 | case 'I': | |
1311 | case 'E': | |
1312 | return (scm_read_number_and_radix (chr, port)); | |
1313 | case '{': | |
1314 | return (scm_read_extended_symbol (chr, port)); | |
1315 | case '!': | |
1316 | return (scm_read_scsh_block_comment (chr, port)); | |
34f3d47d AW |
1317 | case ';': |
1318 | return (scm_read_commented_expression (chr, port)); | |
1319 | case '`': | |
1320 | case '\'': | |
1321 | case ',': | |
1322 | return (scm_read_syntax (chr, port)); | |
7337d56d LC |
1323 | default: |
1324 | result = scm_read_sharp_extension (chr, port); | |
1325 | if (scm_is_eq (result, SCM_UNSPECIFIED)) | |
620c8965 LC |
1326 | { |
1327 | /* To remain compatible with 1.8 and earlier, the following | |
1328 | characters have lower precedence than `read-hash-extend' | |
1329 | characters. */ | |
1330 | switch (chr) | |
1331 | { | |
1332 | case '|': | |
1333 | return scm_read_r6rs_block_comment (chr, port); | |
1334 | default: | |
1335 | scm_i_input_error (FUNC_NAME, port, "Unknown # object: ~S", | |
1336 | scm_list_1 (SCM_MAKE_CHAR (chr))); | |
1337 | } | |
1338 | } | |
7337d56d LC |
1339 | else |
1340 | return result; | |
1341 | } | |
1342 | ||
1343 | return SCM_UNSPECIFIED; | |
1344 | } | |
1345 | #undef FUNC_NAME | |
1346 | ||
1347 | static SCM | |
1348 | scm_read_expression (SCM port) | |
1349 | #define FUNC_NAME "scm_read_expression" | |
1350 | { | |
1351 | while (1) | |
1352 | { | |
889975e5 | 1353 | register scm_t_wchar chr; |
7337d56d LC |
1354 | |
1355 | chr = scm_getc (port); | |
1356 | ||
1357 | switch (chr) | |
1358 | { | |
1359 | case SCM_WHITE_SPACES: | |
1360 | case SCM_LINE_INCREMENTORS: | |
1361 | break; | |
1362 | case ';': | |
1363 | (void) scm_read_semicolon_comment (chr, port); | |
1364 | break; | |
5afa815c AW |
1365 | case '[': |
1366 | if (!SCM_SQUARE_BRACKETS_P) | |
1367 | return (scm_read_mixed_case_symbol (chr, port)); | |
1368 | /* otherwise fall through */ | |
7337d56d LC |
1369 | case '(': |
1370 | return (scm_read_sexp (chr, port)); | |
1371 | case '"': | |
1372 | return (scm_read_string (chr, port)); | |
1373 | case '\'': | |
1374 | case '`': | |
1375 | case ',': | |
1376 | return (scm_read_quote (chr, port)); | |
1377 | case '#': | |
1378 | { | |
1379 | SCM result; | |
1380 | result = scm_read_sharp (chr, port); | |
1381 | if (scm_is_eq (result, SCM_UNSPECIFIED)) | |
1382 | /* We read a comment or some such. */ | |
1383 | break; | |
1384 | else | |
1385 | return result; | |
1386 | } | |
1387 | case ')': | |
1388 | scm_i_input_error (FUNC_NAME, port, "unexpected \")\"", SCM_EOL); | |
1389 | break; | |
1390 | case EOF: | |
1391 | return SCM_EOF_VAL; | |
1392 | case ':': | |
1393 | if (scm_is_eq (SCM_PACK (SCM_KEYWORD_STYLE), scm_keyword_prefix)) | |
1394 | return scm_symbol_to_keyword (scm_read_expression (port)); | |
1395 | /* Fall through. */ | |
1396 | ||
1397 | default: | |
1398 | { | |
1399 | if (((chr >= '0') && (chr <= '9')) | |
1400 | || (strchr ("+-.", chr))) | |
1401 | return (scm_read_number (chr, port)); | |
1402 | else | |
1403 | return (scm_read_mixed_case_symbol (chr, port)); | |
1404 | } | |
1405 | } | |
1406 | } | |
1407 | } | |
1408 | #undef FUNC_NAME | |
1409 | ||
1410 | \f | |
1411 | /* Actual reader. */ | |
1412 | ||
1413 | SCM_DEFINE (scm_read, "read", 0, 1, 0, | |
1414 | (SCM port), | |
1415 | "Read an s-expression from the input port @var{port}, or from\n" | |
1416 | "the current input port if @var{port} is not specified.\n" | |
1417 | "Any whitespace before the next token is discarded.") | |
1418 | #define FUNC_NAME s_scm_read | |
1419 | { | |
1420 | int c; | |
1421 | ||
1422 | if (SCM_UNBNDP (port)) | |
1423 | port = scm_current_input_port (); | |
1424 | SCM_VALIDATE_OPINPORT (1, port); | |
1425 | ||
1426 | c = flush_ws (port, (char *) NULL); | |
1427 | if (EOF == c) | |
1428 | return SCM_EOF_VAL; | |
1429 | scm_ungetc (c, port); | |
1430 | ||
1431 | return (scm_read_expression (port)); | |
09a4f039 | 1432 | } |
db4b4ca6 | 1433 | #undef FUNC_NAME |
09a4f039 | 1434 | |
0f2d19dd JB |
1435 | |
1436 | \f | |
1437 | ||
7337d56d LC |
1438 | /* Used when recording expressions constructed by `scm_read_sharp ()'. */ |
1439 | static SCM | |
1440 | recsexpr (SCM obj, long line, int column, SCM filename) | |
1441 | { | |
1442 | if (!scm_is_pair(obj)) { | |
1443 | return obj; | |
1444 | } else { | |
1445 | SCM tmp = obj, copy; | |
1446 | /* If this sexpr is visible in the read:sharp source, we want to | |
1447 | keep that information, so only record non-constant cons cells | |
1448 | which haven't previously been read by the reader. */ | |
1449 | if (scm_is_false (scm_whash_lookup (scm_source_whash, obj))) | |
1450 | { | |
1451 | if (SCM_COPY_SOURCE_P) | |
1452 | { | |
1453 | copy = scm_cons (recsexpr (SCM_CAR (obj), line, column, filename), | |
1454 | SCM_UNDEFINED); | |
1455 | while ((tmp = SCM_CDR (tmp)) && scm_is_pair (tmp)) | |
1456 | { | |
1457 | SCM_SETCDR (copy, scm_cons (recsexpr (SCM_CAR (tmp), | |
1458 | line, | |
1459 | column, | |
1460 | filename), | |
1461 | SCM_UNDEFINED)); | |
1462 | copy = SCM_CDR (copy); | |
1463 | } | |
1464 | SCM_SETCDR (copy, tmp); | |
1465 | } | |
1466 | else | |
1467 | { | |
1468 | recsexpr (SCM_CAR (obj), line, column, filename); | |
1469 | while ((tmp = SCM_CDR (tmp)) && scm_is_pair (tmp)) | |
1470 | recsexpr (SCM_CAR (tmp), line, column, filename); | |
1471 | copy = SCM_UNDEFINED; | |
1472 | } | |
1473 | scm_whash_insert (scm_source_whash, | |
1474 | obj, | |
1475 | scm_make_srcprops (line, | |
1476 | column, | |
1477 | filename, | |
1478 | copy, | |
1479 | SCM_EOL)); | |
1480 | } | |
1481 | return obj; | |
1482 | } | |
1483 | } | |
1484 | ||
14de3b42 GH |
1485 | /* Manipulate the read-hash-procedures alist. This could be written in |
1486 | Scheme, but maybe it will also be used by C code during initialisation. */ | |
a1ec6916 | 1487 | SCM_DEFINE (scm_read_hash_extend, "read-hash-extend", 2, 0, 0, |
1bbd0b84 | 1488 | (SCM chr, SCM proc), |
dc7fa443 MG |
1489 | "Install the procedure @var{proc} for reading expressions\n" |
1490 | "starting with the character sequence @code{#} and @var{chr}.\n" | |
1491 | "@var{proc} will be called with two arguments: the character\n" | |
1492 | "@var{chr} and the port to read further data from. The object\n" | |
391f57e6 HWN |
1493 | "returned will be the return value of @code{read}. \n" |
1494 | "Passing @code{#f} for @var{proc} will remove a previous setting. \n" | |
1495 | ) | |
1bbd0b84 | 1496 | #define FUNC_NAME s_scm_read_hash_extend |
deca31e1 | 1497 | { |
fed9c9a2 GH |
1498 | SCM this; |
1499 | SCM prev; | |
1500 | ||
36284627 | 1501 | SCM_VALIDATE_CHAR (1, chr); |
7888309b | 1502 | SCM_ASSERT (scm_is_false (proc) |
bc36d050 | 1503 | || scm_is_eq (scm_procedure_p (proc), SCM_BOOL_T), |
36284627 | 1504 | proc, SCM_ARG2, FUNC_NAME); |
fed9c9a2 | 1505 | |
14de3b42 GH |
1506 | /* Check if chr is already in the alist. */ |
1507 | this = *scm_read_hash_procedures; | |
1508 | prev = SCM_BOOL_F; | |
fed9c9a2 GH |
1509 | while (1) |
1510 | { | |
d2e53ed6 | 1511 | if (scm_is_null (this)) |
fed9c9a2 GH |
1512 | { |
1513 | /* not found, so add it to the beginning. */ | |
7888309b | 1514 | if (scm_is_true (proc)) |
fed9c9a2 | 1515 | { |
14de3b42 GH |
1516 | *scm_read_hash_procedures = |
1517 | scm_cons (scm_cons (chr, proc), *scm_read_hash_procedures); | |
fed9c9a2 GH |
1518 | } |
1519 | break; | |
1520 | } | |
bc36d050 | 1521 | if (scm_is_eq (chr, SCM_CAAR (this))) |
fed9c9a2 GH |
1522 | { |
1523 | /* already in the alist. */ | |
7888309b | 1524 | if (scm_is_false (proc)) |
14de3b42 GH |
1525 | { |
1526 | /* remove it. */ | |
7888309b | 1527 | if (scm_is_false (prev)) |
14de3b42 GH |
1528 | { |
1529 | *scm_read_hash_procedures = | |
1530 | SCM_CDR (*scm_read_hash_procedures); | |
1531 | } | |
1532 | else | |
1533 | scm_set_cdr_x (prev, SCM_CDR (this)); | |
1534 | } | |
fed9c9a2 | 1535 | else |
14de3b42 GH |
1536 | { |
1537 | /* replace it. */ | |
1538 | scm_set_cdr_x (SCM_CAR (this), proc); | |
1539 | } | |
fed9c9a2 GH |
1540 | break; |
1541 | } | |
1542 | prev = this; | |
1543 | this = SCM_CDR (this); | |
1544 | } | |
deca31e1 | 1545 | |
deca31e1 GH |
1546 | return SCM_UNSPECIFIED; |
1547 | } | |
1bbd0b84 | 1548 | #undef FUNC_NAME |
0f2d19dd | 1549 | |
deca31e1 GH |
1550 | /* Recover the read-hash procedure corresponding to char c. */ |
1551 | static SCM | |
6e8d25a6 | 1552 | scm_get_hash_procedure (int c) |
deca31e1 | 1553 | { |
14de3b42 | 1554 | SCM rest = *scm_read_hash_procedures; |
fed9c9a2 | 1555 | |
deca31e1 GH |
1556 | while (1) |
1557 | { | |
d2e53ed6 | 1558 | if (scm_is_null (rest)) |
deca31e1 GH |
1559 | return SCM_BOOL_F; |
1560 | ||
7866a09b | 1561 | if (SCM_CHAR (SCM_CAAR (rest)) == c) |
deca31e1 GH |
1562 | return SCM_CDAR (rest); |
1563 | ||
1564 | rest = SCM_CDR (rest); | |
1565 | } | |
1566 | } | |
1cc91f1b | 1567 | |
889975e5 MG |
1568 | #define SCM_ENCODING_SEARCH_SIZE (500) |
1569 | ||
f8a1c9a8 LC |
1570 | /* Search the first few hundred characters of a file for an Emacs-like coding |
1571 | declaration. Returns either NULL or a string whose storage has been | |
1572 | allocated with `scm_gc_malloc ()'. */ | |
889975e5 | 1573 | char * |
f8a1c9a8 | 1574 | scm_i_scan_for_encoding (SCM port) |
889975e5 MG |
1575 | { |
1576 | char header[SCM_ENCODING_SEARCH_SIZE+1]; | |
1577 | size_t bytes_read; | |
1578 | char *encoding = NULL; | |
1579 | int utf8_bom = 0; | |
1580 | char *pos; | |
1581 | int i; | |
1582 | int in_comment; | |
1583 | ||
49bb5bd3 LC |
1584 | if (SCM_FPORTP (port) && !SCM_FDES_RANDOM_P (SCM_FPORT_FDES (port))) |
1585 | /* PORT is a non-seekable file port (e.g., as created by Bash when using | |
1586 | "guile <(echo '(display "hello")')") so bail out. */ | |
1587 | return NULL; | |
1588 | ||
1589 | bytes_read = scm_c_read (port, header, SCM_ENCODING_SEARCH_SIZE); | |
1590 | ||
889975e5 MG |
1591 | scm_seek (port, scm_from_int (0), scm_from_int (SEEK_SET)); |
1592 | ||
1593 | if (bytes_read > 3 | |
1594 | && header[0] == '\xef' && header[1] == '\xbb' && header[2] == '\xbf') | |
1595 | utf8_bom = 1; | |
1596 | ||
1597 | /* search past "coding[:=]" */ | |
1598 | pos = header; | |
1599 | while (1) | |
1600 | { | |
1601 | if ((pos = strstr(pos, "coding")) == NULL) | |
1602 | return NULL; | |
1603 | ||
1604 | pos += strlen("coding"); | |
1605 | if (pos - header >= SCM_ENCODING_SEARCH_SIZE || | |
1606 | (*pos == ':' || *pos == '=')) | |
1607 | { | |
1608 | pos ++; | |
1609 | break; | |
1610 | } | |
1611 | } | |
1612 | ||
1613 | /* skip spaces */ | |
1614 | while (pos - header <= SCM_ENCODING_SEARCH_SIZE && | |
1615 | (*pos == ' ' || *pos == '\t')) | |
1616 | pos ++; | |
1617 | ||
1618 | /* grab the next token */ | |
1619 | i = 0; | |
1620 | while (pos + i - header <= SCM_ENCODING_SEARCH_SIZE | |
060e305a | 1621 | && pos + i - header < bytes_read |
6751d6db | 1622 | && (isalnum ((int) pos[i]) || strchr ("_-.:/,+=()", pos[i]) != NULL)) |
889975e5 MG |
1623 | i++; |
1624 | ||
1625 | if (i == 0) | |
1626 | return NULL; | |
1627 | ||
b9fd657a | 1628 | encoding = scm_gc_strndup (pos, i, "encoding"); |
026ed239 MG |
1629 | for (i = 0; i < strlen (encoding); i++) |
1630 | encoding[i] = toupper ((int) encoding[i]); | |
889975e5 MG |
1631 | |
1632 | /* push backwards to make sure we were in a comment */ | |
1633 | in_comment = 0; | |
1634 | while (pos - i - header > 0) | |
1635 | { | |
1636 | if (*(pos - i) == '\n') | |
1637 | { | |
1638 | /* This wasn't in a semicolon comment. Check for a | |
1639 | hash-bang comment. */ | |
1640 | char *beg = strstr (header, "#!"); | |
1641 | char *end = strstr (header, "!#"); | |
1642 | if (beg < pos && pos < end) | |
1643 | in_comment = 1; | |
1644 | break; | |
1645 | } | |
1646 | if (*(pos - i) == ';') | |
1647 | { | |
1648 | in_comment = 1; | |
1649 | break; | |
1650 | } | |
1651 | i ++; | |
1652 | } | |
1653 | if (!in_comment) | |
f8a1c9a8 LC |
1654 | /* This wasn't in a comment */ |
1655 | return NULL; | |
1656 | ||
889975e5 MG |
1657 | if (utf8_bom && strcmp(encoding, "UTF-8")) |
1658 | scm_misc_error (NULL, | |
1659 | "the port input declares the encoding ~s but is encoded as UTF-8", | |
1660 | scm_list_1 (scm_from_locale_string (encoding))); | |
f8a1c9a8 | 1661 | |
889975e5 MG |
1662 | return encoding; |
1663 | } | |
1664 | ||
1665 | SCM_DEFINE (scm_file_encoding, "file-encoding", 1, 0, 0, | |
1666 | (SCM port), | |
a270e133 | 1667 | "Scans the port for an Emacs-like character coding declaration\n" |
889975e5 MG |
1668 | "near the top of the contents of a port with random-acessible contents.\n" |
1669 | "The coding declaration is of the form\n" | |
1670 | "@code{coding: XXXXX} and must appear in a scheme comment.\n" | |
1671 | "\n" | |
1672 | "Returns a string containing the character encoding of the file\n" | |
1673 | "if a declaration was found, or @code{#f} otherwise.\n") | |
1674 | #define FUNC_NAME s_scm_file_encoding | |
1675 | { | |
1676 | char *enc; | |
1677 | SCM s_enc; | |
f8a1c9a8 LC |
1678 | |
1679 | enc = scm_i_scan_for_encoding (port); | |
889975e5 MG |
1680 | if (enc == NULL) |
1681 | return SCM_BOOL_F; | |
1682 | else | |
1683 | { | |
1684 | s_enc = scm_from_locale_string (enc); | |
889975e5 MG |
1685 | return s_enc; |
1686 | } | |
f8a1c9a8 | 1687 | |
889975e5 MG |
1688 | return SCM_BOOL_F; |
1689 | } | |
1690 | #undef FUNC_NAME | |
1691 | ||
0f2d19dd JB |
1692 | void |
1693 | scm_init_read () | |
0f2d19dd | 1694 | { |
14de3b42 | 1695 | scm_read_hash_procedures = |
86d31dfe | 1696 | SCM_VARIABLE_LOC (scm_c_define ("read-hash-procedures", SCM_EOL)); |
fed9c9a2 | 1697 | |
62560650 | 1698 | scm_init_opts (scm_read_options, scm_read_opts); |
a0599745 | 1699 | #include "libguile/read.x" |
0f2d19dd | 1700 | } |
89e00824 ML |
1701 | |
1702 | /* | |
1703 | Local Variables: | |
1704 | c-file-style: "gnu" | |
1705 | End: | |
1706 | */ |