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."}, |
210c0325 | 73 | { SCM_OPTION_SCM, "keywords", (scm_t_bits) SCM_BOOL_F_BITS, |
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); | |
0f2d19dd JB |
360 | |
361 | ||
09a4f039 | 362 | static SCM |
889975e5 | 363 | scm_read_sexp (scm_t_wchar chr, SCM port) |
7337d56d | 364 | #define FUNC_NAME "scm_i_lreadparen" |
09a4f039 | 365 | { |
26c8cc14 AW |
366 | int c; |
367 | SCM tmp, tl, ans = SCM_EOL; | |
5afa815c | 368 | const int terminating_char = ((chr == '[') ? ']' : ')'); |
7337d56d LC |
369 | |
370 | /* Need to capture line and column numbers here. */ | |
371 | long line = SCM_LINUM (port); | |
372 | int column = SCM_COL (port) - 1; | |
f9c68a47 | 373 | |
7337d56d LC |
374 | c = flush_ws (port, FUNC_NAME); |
375 | if (terminating_char == c) | |
376 | return SCM_EOL; | |
f9c68a47 | 377 | |
7337d56d | 378 | scm_ungetc (c, port); |
1f7945a7 AW |
379 | tmp = scm_read_expression (port); |
380 | ||
381 | /* Note that it is possible for scm_read_expression to return | |
382 | scm_sym_dot, but not as part of a dotted pair: as in #{.}#. So | |
383 | check that it's a real dot by checking `c'. */ | |
384 | if (c == '.' && scm_is_eq (scm_sym_dot, tmp)) | |
7337d56d LC |
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 | ||
7337d56d | 396 | while (terminating_char != (c = flush_ws (port, FUNC_NAME))) |
0f2d19dd | 397 | { |
7337d56d | 398 | SCM new_tail; |
0f2d19dd | 399 | |
5b69315e AW |
400 | if (c == ')' || (SCM_SQUARE_BRACKETS_P && c == ']')) |
401 | scm_i_input_error (FUNC_NAME, port, | |
402 | "in pair: mismatched close paren: ~A", | |
403 | scm_list_1 (SCM_MAKE_CHAR (c))); | |
404 | ||
7337d56d | 405 | scm_ungetc (c, port); |
5b69315e AW |
406 | tmp = scm_read_expression (port); |
407 | ||
1f7945a7 AW |
408 | /* See above note about scm_sym_dot. */ |
409 | if (c == '.' && scm_is_eq (scm_sym_dot, tmp)) | |
0f2d19dd | 410 | { |
89f88612 | 411 | SCM_SETCDR (tl, scm_read_expression (port)); |
7337d56d | 412 | |
7337d56d LC |
413 | c = flush_ws (port, FUNC_NAME); |
414 | if (terminating_char != c) | |
415 | scm_i_input_error (FUNC_NAME, port, | |
416 | "in pair: missing close paren", SCM_EOL); | |
417 | goto exit; | |
0f2d19dd | 418 | } |
b858464a | 419 | |
7337d56d LC |
420 | new_tail = scm_cons (tmp, SCM_EOL); |
421 | SCM_SETCDR (tl, new_tail); | |
422 | tl = new_tail; | |
7337d56d | 423 | } |
0f2d19dd | 424 | |
7337d56d LC |
425 | exit: |
426 | if (SCM_RECORD_POSITIONS_P) | |
26c8cc14 AW |
427 | scm_i_set_source_properties_x (ans, line, column, SCM_FILENAME (port)); |
428 | ||
7337d56d LC |
429 | return ans; |
430 | } | |
431 | #undef FUNC_NAME | |
a4022e69 | 432 | |
c5661d28 MG |
433 | |
434 | /* Read a hexadecimal number NDIGITS in length. Put its value into the variable | |
dea901d6 MG |
435 | C. If TERMINATOR is non-null, terminate early if the TERMINATOR character is |
436 | found. */ | |
437 | #define SCM_READ_HEX_ESCAPE(ndigits, terminator) \ | |
438 | do \ | |
439 | { \ | |
440 | scm_t_wchar a; \ | |
441 | size_t i = 0; \ | |
442 | c = 0; \ | |
443 | while (i < ndigits) \ | |
444 | { \ | |
445 | a = scm_getc (port); \ | |
446 | if (a == EOF) \ | |
447 | goto str_eof; \ | |
448 | if (terminator \ | |
449 | && (a == (scm_t_wchar) terminator) \ | |
450 | && (i > 0)) \ | |
451 | break; \ | |
452 | if ('0' <= a && a <= '9') \ | |
453 | a -= '0'; \ | |
454 | else if ('A' <= a && a <= 'F') \ | |
455 | a = a - 'A' + 10; \ | |
456 | else if ('a' <= a && a <= 'f') \ | |
457 | a = a - 'a' + 10; \ | |
458 | else \ | |
459 | { \ | |
460 | c = a; \ | |
461 | goto bad_escaped; \ | |
462 | } \ | |
463 | c = c * 16 + a; \ | |
464 | i ++; \ | |
465 | } \ | |
c5661d28 MG |
466 | } while (0) |
467 | ||
684d664e AW |
468 | static void |
469 | skip_intraline_whitespace (SCM port) | |
470 | { | |
471 | scm_t_wchar c; | |
472 | ||
473 | do | |
474 | { | |
475 | c = scm_getc (port); | |
476 | if (c == EOF) | |
477 | return; | |
478 | } | |
479 | while (c == '\t' || uc_is_general_category (c, UC_SPACE_SEPARATOR)); | |
480 | ||
481 | scm_ungetc (c, port); | |
482 | } | |
483 | ||
7337d56d LC |
484 | static SCM |
485 | scm_read_string (int chr, SCM port) | |
486 | #define FUNC_NAME "scm_lreadr" | |
487 | { | |
488 | /* For strings smaller than C_STR, this function creates only one Scheme | |
489 | object (the string returned). */ | |
0f2d19dd | 490 | |
7337d56d | 491 | SCM str = SCM_BOOL_F; |
7337d56d | 492 | unsigned c_str_len = 0; |
9c44cd45 | 493 | scm_t_wchar c; |
eb42ff25 | 494 | |
190d4b0d | 495 | str = scm_i_make_string (READER_STRING_BUFFER_SIZE, NULL, 0); |
7337d56d LC |
496 | while ('"' != (c = scm_getc (port))) |
497 | { | |
498 | if (c == EOF) | |
9c44cd45 MG |
499 | { |
500 | str_eof: | |
501 | scm_i_input_error (FUNC_NAME, port, | |
502 | "end of file in string constant", SCM_EOL); | |
503 | } | |
0f2d19dd | 504 | |
9c44cd45 MG |
505 | if (c_str_len + 1 >= scm_i_string_length (str)) |
506 | { | |
190d4b0d | 507 | SCM addy = scm_i_make_string (READER_STRING_BUFFER_SIZE, NULL, 0); |
0f2d19dd | 508 | |
9c44cd45 MG |
509 | str = scm_string_append (scm_list_2 (str, addy)); |
510 | } | |
0f2d19dd | 511 | |
7337d56d | 512 | if (c == '\\') |
9c44cd45 MG |
513 | { |
514 | switch (c = scm_getc (port)) | |
515 | { | |
516 | case EOF: | |
517 | goto str_eof; | |
518 | case '"': | |
519 | case '\\': | |
520 | break; | |
9c44cd45 | 521 | case '\n': |
684d664e AW |
522 | if (SCM_HUNGRY_EOL_ESCAPES_P) |
523 | skip_intraline_whitespace (port); | |
9c44cd45 MG |
524 | continue; |
525 | case '0': | |
526 | c = '\0'; | |
527 | break; | |
528 | case 'f': | |
529 | c = '\f'; | |
530 | break; | |
531 | case 'n': | |
532 | c = '\n'; | |
533 | break; | |
534 | case 'r': | |
535 | c = '\r'; | |
536 | break; | |
537 | case 't': | |
538 | c = '\t'; | |
539 | break; | |
540 | case 'a': | |
541 | c = '\007'; | |
542 | break; | |
543 | case 'v': | |
544 | c = '\v'; | |
545 | break; | |
67a4a16d MG |
546 | case 'b': |
547 | c = '\010'; | |
548 | break; | |
9c44cd45 | 549 | case 'x': |
dea901d6 MG |
550 | if (SCM_R6RS_ESCAPES_P) |
551 | SCM_READ_HEX_ESCAPE (10, ';'); | |
552 | else | |
553 | SCM_READ_HEX_ESCAPE (2, '\0'); | |
c5661d28 | 554 | break; |
9c44cd45 | 555 | case 'u': |
898a0b5a MG |
556 | if (!SCM_R6RS_ESCAPES_P) |
557 | { | |
558 | SCM_READ_HEX_ESCAPE (4, '\0'); | |
559 | break; | |
560 | } | |
9c44cd45 | 561 | case 'U': |
898a0b5a MG |
562 | if (!SCM_R6RS_ESCAPES_P) |
563 | { | |
564 | SCM_READ_HEX_ESCAPE (6, '\0'); | |
565 | break; | |
566 | } | |
9c44cd45 MG |
567 | default: |
568 | bad_escaped: | |
569 | scm_i_input_error (FUNC_NAME, port, | |
570 | "illegal character in escape sequence: ~S", | |
571 | scm_list_1 (SCM_MAKE_CHAR (c))); | |
572 | } | |
573 | } | |
574 | str = scm_i_string_start_writing (str); | |
575 | scm_i_string_set_x (str, c_str_len++, c); | |
576 | scm_i_string_stop_writing (); | |
7337d56d | 577 | } |
f13b4400 | 578 | |
7337d56d LC |
579 | if (c_str_len > 0) |
580 | { | |
9c44cd45 | 581 | return scm_i_substring_copy (str, 0, c_str_len); |
0f2d19dd | 582 | } |
69f90b0b | 583 | |
9c44cd45 | 584 | return scm_nullstr; |
0f2d19dd | 585 | } |
db4b4ca6 DH |
586 | #undef FUNC_NAME |
587 | ||
0f2d19dd | 588 | |
7337d56d | 589 | static SCM |
889975e5 | 590 | scm_read_number (scm_t_wchar chr, SCM port) |
0f2d19dd | 591 | { |
69f90b0b MG |
592 | SCM result, str = SCM_EOL; |
593 | char buffer[READER_BUFFER_SIZE]; | |
594 | char *overflow_buffer = NULL; | |
595 | size_t bytes_read; | |
596 | int overflow; | |
597 | scm_t_port *pt = SCM_PTAB_ENTRY (port); | |
0f2d19dd | 598 | |
7337d56d | 599 | scm_ungetc (chr, port); |
69f90b0b MG |
600 | overflow = read_complete_token (port, buffer, sizeof (buffer), |
601 | &overflow_buffer, &bytes_read); | |
602 | ||
603 | if (!overflow) | |
604 | str = scm_from_stringn (buffer, bytes_read, pt->encoding, pt->ilseq_handler); | |
605 | else | |
606 | str = scm_from_stringn (overflow_buffer, bytes_read, pt->encoding, | |
607 | pt->ilseq_handler); | |
608 | ||
609 | result = scm_string_to_number (str, SCM_UNDEFINED); | |
889975e5 | 610 | if (!scm_is_true (result)) |
69f90b0b MG |
611 | { |
612 | /* Return a symbol instead of a number */ | |
613 | if (SCM_CASE_INSENSITIVE_P) | |
614 | str = scm_string_downcase_x (str); | |
615 | result = scm_string_to_symbol (str); | |
616 | } | |
0f2d19dd | 617 | |
69f90b0b MG |
618 | if (overflow) |
619 | free (overflow_buffer); | |
620 | SCM_COL (port) += scm_i_string_length (str); | |
7337d56d LC |
621 | return result; |
622 | } | |
0f2d19dd | 623 | |
7337d56d | 624 | static SCM |
889975e5 | 625 | scm_read_mixed_case_symbol (scm_t_wchar chr, SCM port) |
7337d56d | 626 | { |
889975e5 MG |
627 | SCM result; |
628 | int ends_with_colon = 0; | |
69f90b0b | 629 | size_t bytes_read; |
ef4cbc08 | 630 | int postfix = scm_is_eq (SCM_PACK (SCM_KEYWORD_STYLE), scm_keyword_postfix); |
69f90b0b MG |
631 | int overflow; |
632 | char buffer[READER_BUFFER_SIZE], *overflow_buffer; | |
633 | scm_t_port *pt = SCM_PTAB_ENTRY (port); | |
634 | SCM str; | |
7337d56d LC |
635 | |
636 | scm_ungetc (chr, port); | |
69f90b0b MG |
637 | overflow = read_complete_token (port, buffer, READER_BUFFER_SIZE, |
638 | &overflow_buffer, &bytes_read); | |
639 | if (bytes_read > 0) | |
640 | { | |
641 | if (!overflow) | |
642 | ends_with_colon = buffer[bytes_read - 1] == ':'; | |
643 | else | |
644 | ends_with_colon = overflow_buffer[bytes_read - 1] == ':'; | |
645 | } | |
ef4cbc08 | 646 | |
69f90b0b MG |
647 | if (postfix && ends_with_colon && (bytes_read > 1)) |
648 | { | |
649 | if (!overflow) | |
650 | str = scm_from_stringn (buffer, bytes_read - 1, pt->encoding, pt->ilseq_handler); | |
651 | else | |
652 | str = scm_from_stringn (overflow_buffer, bytes_read - 1, pt->encoding, | |
653 | pt->ilseq_handler); | |
654 | ||
655 | if (SCM_CASE_INSENSITIVE_P) | |
656 | str = scm_string_downcase_x (str); | |
657 | result = scm_symbol_to_keyword (scm_string_to_symbol (str)); | |
658 | } | |
7337d56d | 659 | else |
69f90b0b MG |
660 | { |
661 | if (!overflow) | |
662 | str = scm_from_stringn (buffer, bytes_read, pt->encoding, pt->ilseq_handler); | |
663 | else | |
664 | str = scm_from_stringn (overflow_buffer, bytes_read, pt->encoding, | |
665 | pt->ilseq_handler); | |
666 | ||
667 | if (SCM_CASE_INSENSITIVE_P) | |
668 | str = scm_string_downcase_x (str); | |
669 | result = scm_string_to_symbol (str); | |
670 | } | |
7337d56d | 671 | |
69f90b0b MG |
672 | if (overflow) |
673 | free (overflow_buffer); | |
674 | SCM_COL (port) += scm_i_string_length (str); | |
7337d56d LC |
675 | return result; |
676 | } | |
677 | ||
678 | static SCM | |
889975e5 | 679 | scm_read_number_and_radix (scm_t_wchar chr, SCM port) |
7337d56d LC |
680 | #define FUNC_NAME "scm_lreadr" |
681 | { | |
889975e5 | 682 | SCM result; |
7337d56d | 683 | size_t read; |
69f90b0b MG |
684 | char buffer[READER_BUFFER_SIZE], *overflow_buffer; |
685 | int overflow; | |
7337d56d | 686 | unsigned int radix; |
69f90b0b MG |
687 | SCM str; |
688 | scm_t_port *pt; | |
7337d56d LC |
689 | |
690 | switch (chr) | |
691 | { | |
692 | case 'B': | |
693 | case 'b': | |
694 | radix = 2; | |
695 | break; | |
696 | ||
697 | case 'o': | |
698 | case 'O': | |
699 | radix = 8; | |
700 | break; | |
701 | ||
702 | case 'd': | |
703 | case 'D': | |
704 | radix = 10; | |
705 | break; | |
706 | ||
707 | case 'x': | |
708 | case 'X': | |
709 | radix = 16; | |
710 | break; | |
711 | ||
712 | default: | |
713 | scm_ungetc (chr, port); | |
714 | scm_ungetc ('#', port); | |
715 | radix = 10; | |
716 | } | |
717 | ||
69f90b0b MG |
718 | overflow = read_complete_token (port, buffer, sizeof (buffer), |
719 | &overflow_buffer, &read); | |
720 | ||
721 | pt = SCM_PTAB_ENTRY (port); | |
722 | if (!overflow) | |
723 | str = scm_from_stringn (buffer, read, pt->encoding, pt->ilseq_handler); | |
724 | else | |
725 | str = scm_from_stringn (overflow_buffer, read, pt->encoding, | |
726 | pt->ilseq_handler); | |
727 | ||
728 | result = scm_string_to_number (str, scm_from_uint (radix)); | |
729 | ||
730 | if (overflow) | |
731 | free (overflow_buffer); | |
732 | ||
733 | SCM_COL (port) += scm_i_string_length (str); | |
7337d56d LC |
734 | |
735 | if (scm_is_true (result)) | |
736 | return result; | |
737 | ||
738 | scm_i_input_error (FUNC_NAME, port, "unknown # object", SCM_EOL); | |
739 | ||
740 | return SCM_BOOL_F; | |
741 | } | |
742 | #undef FUNC_NAME | |
743 | ||
744 | static SCM | |
745 | scm_read_quote (int chr, SCM port) | |
746 | { | |
747 | SCM p; | |
492faee1 LC |
748 | long line = SCM_LINUM (port); |
749 | int column = SCM_COL (port) - 1; | |
7337d56d LC |
750 | |
751 | switch (chr) | |
752 | { | |
753 | case '`': | |
754 | p = scm_sym_quasiquote; | |
755 | break; | |
756 | ||
757 | case '\'': | |
758 | p = scm_sym_quote; | |
759 | break; | |
760 | ||
761 | case ',': | |
762 | { | |
889975e5 | 763 | scm_t_wchar c; |
7337d56d LC |
764 | |
765 | c = scm_getc (port); | |
766 | if ('@' == c) | |
767 | p = scm_sym_uq_splicing; | |
768 | else | |
0f2d19dd | 769 | { |
7337d56d LC |
770 | scm_ungetc (c, port); |
771 | p = scm_sym_unquote; | |
0f2d19dd | 772 | } |
7337d56d LC |
773 | break; |
774 | } | |
0f2d19dd | 775 | |
7337d56d LC |
776 | default: |
777 | fprintf (stderr, "%s: unhandled quote character (%i)\n", | |
7f74cf9a | 778 | "scm_read_quote", chr); |
7337d56d | 779 | abort (); |
0f2d19dd | 780 | } |
1cc91f1b | 781 | |
7337d56d | 782 | p = scm_cons2 (p, scm_read_expression (port), SCM_EOL); |
492faee1 | 783 | if (SCM_RECORD_POSITIONS_P) |
26c8cc14 | 784 | scm_i_set_source_properties_x (p, line, column, SCM_FILENAME (port)); |
0f2d19dd | 785 | |
7337d56d LC |
786 | return p; |
787 | } | |
788 | ||
34f3d47d AW |
789 | SCM_SYMBOL (sym_syntax, "syntax"); |
790 | SCM_SYMBOL (sym_quasisyntax, "quasisyntax"); | |
791 | SCM_SYMBOL (sym_unsyntax, "unsyntax"); | |
792 | SCM_SYMBOL (sym_unsyntax_splicing, "unsyntax-splicing"); | |
793 | ||
794 | static SCM | |
795 | scm_read_syntax (int chr, SCM port) | |
796 | { | |
797 | SCM p; | |
798 | long line = SCM_LINUM (port); | |
799 | int column = SCM_COL (port) - 1; | |
800 | ||
801 | switch (chr) | |
802 | { | |
803 | case '`': | |
804 | p = sym_quasisyntax; | |
805 | break; | |
806 | ||
807 | case '\'': | |
808 | p = sym_syntax; | |
809 | break; | |
810 | ||
811 | case ',': | |
812 | { | |
813 | int c; | |
814 | ||
815 | c = scm_getc (port); | |
816 | if ('@' == c) | |
817 | p = sym_unsyntax_splicing; | |
818 | else | |
819 | { | |
820 | scm_ungetc (c, port); | |
821 | p = sym_unsyntax; | |
822 | } | |
823 | break; | |
824 | } | |
825 | ||
826 | default: | |
827 | fprintf (stderr, "%s: unhandled syntax character (%i)\n", | |
828 | "scm_read_syntax", chr); | |
829 | abort (); | |
830 | } | |
831 | ||
832 | p = scm_cons2 (p, scm_read_expression (port), SCM_EOL); | |
833 | if (SCM_RECORD_POSITIONS_P) | |
26c8cc14 | 834 | scm_i_set_source_properties_x (p, line, column, SCM_FILENAME (port)); |
34f3d47d AW |
835 | |
836 | return p; | |
837 | } | |
838 | ||
7c4aad9c AW |
839 | static inline SCM |
840 | scm_read_nil (int chr, SCM port) | |
841 | { | |
842 | SCM id = scm_read_mixed_case_symbol (chr, port); | |
843 | ||
844 | if (!scm_is_eq (id, sym_nil)) | |
845 | scm_i_input_error ("scm_read_nil", port, | |
846 | "unexpected input while reading #nil: ~a", | |
847 | scm_list_1 (id)); | |
848 | ||
849 | return SCM_ELISP_NIL; | |
850 | } | |
851 | ||
7337d56d LC |
852 | static inline SCM |
853 | scm_read_semicolon_comment (int chr, SCM port) | |
0f2d19dd | 854 | { |
0f2d19dd JB |
855 | int c; |
856 | ||
889975e5 MG |
857 | /* We use the get_byte here because there is no need to get the |
858 | locale correct with comment input. This presumes that newline | |
859 | always represents itself no matter what the encoding is. */ | |
860 | for (c = scm_get_byte_or_eof (port); | |
7337d56d | 861 | (c != EOF) && (c != '\n'); |
8a8da78d | 862 | c = scm_get_byte_or_eof (port)); |
7337d56d LC |
863 | |
864 | return SCM_UNSPECIFIED; | |
865 | } | |
866 | ||
867 | \f | |
868 | /* Sharp readers, i.e. readers called after a `#' sign has been read. */ | |
869 | ||
870 | static SCM | |
871 | scm_read_boolean (int chr, SCM port) | |
872 | { | |
873 | switch (chr) | |
0f2d19dd | 874 | { |
7337d56d LC |
875 | case 't': |
876 | case 'T': | |
877 | return SCM_BOOL_T; | |
878 | ||
879 | case 'f': | |
880 | case 'F': | |
881 | return SCM_BOOL_F; | |
0f2d19dd | 882 | } |
7337d56d LC |
883 | |
884 | return SCM_UNSPECIFIED; | |
885 | } | |
886 | ||
887 | static SCM | |
889975e5 | 888 | scm_read_character (scm_t_wchar chr, SCM port) |
7337d56d LC |
889 | #define FUNC_NAME "scm_lreadr" |
890 | { | |
69f90b0b MG |
891 | char buffer[READER_CHAR_NAME_MAX_SIZE]; |
892 | SCM charname; | |
893 | size_t charname_len, bytes_read; | |
889975e5 MG |
894 | scm_t_wchar cp; |
895 | int overflow; | |
69f90b0b | 896 | scm_t_port *pt; |
889975e5 | 897 | |
69f90b0b | 898 | overflow = read_token (port, buffer, READER_CHAR_NAME_MAX_SIZE, &bytes_read); |
889975e5 | 899 | if (overflow) |
c1a0ba1c | 900 | scm_i_input_error (FUNC_NAME, port, "character name too long", SCM_EOL); |
7337d56d | 901 | |
69f90b0b | 902 | if (bytes_read == 0) |
0f2d19dd | 903 | { |
7337d56d LC |
904 | chr = scm_getc (port); |
905 | if (chr == EOF) | |
906 | scm_i_input_error (FUNC_NAME, port, "unexpected end of file " | |
907 | "while reading character", SCM_EOL); | |
908 | ||
909 | /* CHR must be a token delimiter, like a whitespace. */ | |
910 | return (SCM_MAKE_CHAR (chr)); | |
0f2d19dd | 911 | } |
7337d56d | 912 | |
69f90b0b | 913 | pt = SCM_PTAB_ENTRY (port); |
7337d56d | 914 | |
69f90b0b MG |
915 | /* Simple ASCII characters can be processed immediately. Also, simple |
916 | ISO-8859-1 characters can be processed immediately if the encoding for this | |
917 | port is ISO-8859-1. */ | |
918 | if (bytes_read == 1 && ((unsigned char) buffer[0] <= 127 || pt->encoding == NULL)) | |
919 | { | |
920 | SCM_COL (port) += 1; | |
921 | return SCM_MAKE_CHAR (buffer[0]); | |
922 | } | |
923 | ||
924 | /* Otherwise, convert the buffer into a proper scheme string for | |
925 | processing. */ | |
926 | charname = scm_from_stringn (buffer, bytes_read, pt->encoding, | |
927 | pt->ilseq_handler); | |
928 | charname_len = scm_i_string_length (charname); | |
929 | SCM_COL (port) += charname_len; | |
889975e5 | 930 | cp = scm_i_string_ref (charname, 0); |
69f90b0b MG |
931 | if (charname_len == 1) |
932 | return SCM_MAKE_CHAR (cp); | |
933 | ||
934 | /* Ignore dotted circles, which may be used to keep combining characters from | |
935 | combining with the backslash in #\charname. */ | |
0dcd7e61 MG |
936 | if (cp == SCM_CODEPOINT_DOTTED_CIRCLE && charname_len == 2) |
937 | return SCM_MAKE_CHAR (scm_i_string_ref (charname, 1)); | |
938 | ||
889975e5 | 939 | if (cp >= '0' && cp < '8') |
7337d56d LC |
940 | { |
941 | /* Dirk:FIXME:: This type of character syntax is not R5RS | |
942 | * compliant. Further, it should be verified that the constant | |
0ffc78e3 | 943 | * does only consist of octal digits. */ |
889975e5 | 944 | SCM p = scm_string_to_number (charname, scm_from_uint (8)); |
7337d56d | 945 | if (SCM_I_INUMP (p)) |
0ffc78e3 | 946 | { |
e25f3727 | 947 | scm_t_wchar c = scm_to_uint32 (p); |
0ffc78e3 MG |
948 | if (SCM_IS_UNICODE_CHAR (c)) |
949 | return SCM_MAKE_CHAR (c); | |
950 | else | |
0f3a70cf | 951 | scm_i_input_error (FUNC_NAME, port, |
0ffc78e3 MG |
952 | "out-of-range octal character escape: ~a", |
953 | scm_list_1 (charname)); | |
954 | } | |
7337d56d LC |
955 | } |
956 | ||
0f3a70cf | 957 | if (cp == 'x' && (charname_len > 1)) |
dea901d6 MG |
958 | { |
959 | SCM p; | |
0f3a70cf | 960 | |
dea901d6 MG |
961 | /* Convert from hex, skipping the initial 'x' character in CHARNAME */ |
962 | p = scm_string_to_number (scm_c_substring (charname, 1, charname_len), | |
963 | scm_from_uint (16)); | |
964 | if (SCM_I_INUMP (p)) | |
965 | { | |
e25f3727 | 966 | scm_t_wchar c = scm_to_uint32 (p); |
dea901d6 MG |
967 | if (SCM_IS_UNICODE_CHAR (c)) |
968 | return SCM_MAKE_CHAR (c); | |
969 | else | |
970 | scm_i_input_error (FUNC_NAME, port, | |
971 | "out-of-range hex character escape: ~a", | |
972 | scm_list_1 (charname)); | |
973 | } | |
974 | } | |
975 | ||
889975e5 MG |
976 | /* The names of characters should never have non-Latin1 |
977 | characters. */ | |
978 | if (scm_i_is_narrow_string (charname) | |
979 | || scm_i_try_narrow_string (charname)) | |
4769c9db AW |
980 | { SCM ch = scm_i_charname_to_char (scm_i_string_chars (charname), |
981 | charname_len); | |
982 | if (scm_is_true (ch)) | |
983 | return ch; | |
984 | } | |
7337d56d | 985 | |
7337d56d | 986 | scm_i_input_error (FUNC_NAME, port, "unknown character name ~a", |
889975e5 | 987 | scm_list_1 (charname)); |
7337d56d LC |
988 | |
989 | return SCM_UNSPECIFIED; | |
0f2d19dd | 990 | } |
db4b4ca6 | 991 | #undef FUNC_NAME |
0f2d19dd | 992 | |
7337d56d LC |
993 | static inline SCM |
994 | scm_read_keyword (int chr, SCM port) | |
995 | { | |
996 | SCM symbol; | |
997 | ||
998 | /* Read the symbol that comprises the keyword. Doing this instead of | |
999 | invoking a specific symbol reader function allows `scm_read_keyword ()' | |
1000 | to adapt to the delimiters currently valid of symbols. | |
1cc91f1b | 1001 | |
7337d56d LC |
1002 | XXX: This implementation allows sloppy syntaxes like `#: key'. */ |
1003 | symbol = scm_read_expression (port); | |
1004 | if (!scm_is_symbol (symbol)) | |
7f74cf9a | 1005 | scm_i_input_error ("scm_read_keyword", port, |
7337d56d LC |
1006 | "keyword prefix `~a' not followed by a symbol: ~s", |
1007 | scm_list_2 (SCM_MAKE_CHAR (chr), symbol)); | |
1008 | ||
1009 | return (scm_symbol_to_keyword (symbol)); | |
1010 | } | |
1011 | ||
1012 | static inline SCM | |
1013 | scm_read_vector (int chr, SCM port) | |
09a4f039 | 1014 | { |
7337d56d LC |
1015 | /* Note: We call `scm_read_sexp ()' rather than READER here in order to |
1016 | guarantee that it's going to do what we want. After all, this is an | |
1017 | implementation detail of `scm_read_vector ()', not a desirable | |
1018 | property. */ | |
1019 | return (scm_vector (scm_read_sexp (chr, port))); | |
1020 | } | |
09a4f039 | 1021 | |
7337d56d LC |
1022 | static inline SCM |
1023 | scm_read_srfi4_vector (int chr, SCM port) | |
1024 | { | |
1025 | return scm_i_read_array (port, chr); | |
1026 | } | |
1027 | ||
0ba0b384 | 1028 | static SCM |
889975e5 | 1029 | scm_read_bytevector (scm_t_wchar chr, SCM port) |
0ba0b384 LC |
1030 | { |
1031 | chr = scm_getc (port); | |
1032 | if (chr != 'u') | |
1033 | goto syntax; | |
1034 | ||
1035 | chr = scm_getc (port); | |
1036 | if (chr != '8') | |
1037 | goto syntax; | |
1038 | ||
1039 | chr = scm_getc (port); | |
1040 | if (chr != '(') | |
1041 | goto syntax; | |
1042 | ||
1043 | return scm_u8_list_to_bytevector (scm_read_sexp (chr, port)); | |
1044 | ||
1045 | syntax: | |
1046 | scm_i_input_error ("read_bytevector", port, | |
1047 | "invalid bytevector prefix", | |
1048 | SCM_MAKE_CHAR (chr)); | |
1049 | return SCM_UNSPECIFIED; | |
1050 | } | |
1051 | ||
7337d56d | 1052 | static SCM |
889975e5 | 1053 | scm_read_guile_bit_vector (scm_t_wchar chr, SCM port) |
7337d56d LC |
1054 | { |
1055 | /* Read the `#*10101'-style read syntax for bit vectors in Guile. This is | |
1056 | terribly inefficient but who cares? */ | |
1057 | SCM s_bits = SCM_EOL; | |
1058 | ||
1059 | for (chr = scm_getc (port); | |
1060 | (chr != EOF) && ((chr == '0') || (chr == '1')); | |
1061 | chr = scm_getc (port)) | |
09a4f039 | 1062 | { |
7337d56d | 1063 | s_bits = scm_cons ((chr == '0') ? SCM_BOOL_F : SCM_BOOL_T, s_bits); |
09a4f039 | 1064 | } |
7337d56d LC |
1065 | |
1066 | if (chr != EOF) | |
1067 | scm_ungetc (chr, port); | |
1068 | ||
1069 | return scm_bitvector (scm_reverse_x (s_bits, SCM_EOL)); | |
1070 | } | |
1071 | ||
1072 | static inline SCM | |
889975e5 | 1073 | scm_read_scsh_block_comment (scm_t_wchar chr, SCM port) |
7337d56d LC |
1074 | { |
1075 | int bang_seen = 0; | |
1076 | ||
1077 | for (;;) | |
09a4f039 | 1078 | { |
58b1db5f | 1079 | int c = scm_getc (port); |
62850ef3 | 1080 | |
7337d56d LC |
1081 | if (c == EOF) |
1082 | scm_i_input_error ("skip_block_comment", port, | |
1083 | "unterminated `#! ... !#' comment", SCM_EOL); | |
1084 | ||
1085 | if (c == '!') | |
1086 | bang_seen = 1; | |
1087 | else if (c == '#' && bang_seen) | |
1088 | break; | |
1089 | else | |
1090 | bang_seen = 0; | |
1091 | } | |
1092 | ||
1093 | return SCM_UNSPECIFIED; | |
1094 | } | |
1095 | ||
d7fcaec3 | 1096 | static SCM |
911b03b2 JG |
1097 | scm_read_shebang (scm_t_wchar chr, SCM port) |
1098 | { | |
1099 | int c = 0; | |
1100 | if ((c = scm_get_byte_or_eof (port)) != 'r') | |
1101 | { | |
1102 | scm_ungetc (c, port); | |
1103 | return scm_read_scsh_block_comment (chr, port); | |
1104 | } | |
1105 | if ((c = scm_get_byte_or_eof (port)) != '6') | |
1106 | { | |
1107 | scm_ungetc (c, port); | |
1108 | scm_ungetc ('r', port); | |
1109 | return scm_read_scsh_block_comment (chr, port); | |
1110 | } | |
1111 | if ((c = scm_get_byte_or_eof (port)) != 'r') | |
1112 | { | |
1113 | scm_ungetc (c, port); | |
1114 | scm_ungetc ('6', port); | |
1115 | scm_ungetc ('r', port); | |
1116 | return scm_read_scsh_block_comment (chr, port); | |
1117 | } | |
1118 | if ((c = scm_get_byte_or_eof (port)) != 's') | |
1119 | { | |
1120 | scm_ungetc (c, port); | |
1121 | scm_ungetc ('r', port); | |
1122 | scm_ungetc ('6', port); | |
1123 | scm_ungetc ('r', port); | |
1124 | return scm_read_scsh_block_comment (chr, port); | |
1125 | } | |
1126 | ||
1127 | return SCM_UNSPECIFIED; | |
1128 | } | |
1129 | ||
620c8965 LC |
1130 | static SCM |
1131 | scm_read_r6rs_block_comment (scm_t_wchar chr, SCM port) | |
1132 | { | |
1133 | /* Unlike SCSH-style block comments, SRFI-30/R6RS block comments may be | |
1134 | nested. So care must be taken. */ | |
1135 | int nesting_level = 1; | |
6d5f8c32 AW |
1136 | |
1137 | int a = scm_getc (port); | |
1138 | ||
1139 | if (a == EOF) | |
1140 | scm_i_input_error ("scm_read_r6rs_block_comment", port, | |
1141 | "unterminated `#| ... |#' comment", SCM_EOL); | |
620c8965 LC |
1142 | |
1143 | while (nesting_level > 0) | |
1144 | { | |
6d5f8c32 | 1145 | int b = scm_getc (port); |
620c8965 | 1146 | |
6d5f8c32 | 1147 | if (b == EOF) |
cd169c5a | 1148 | scm_i_input_error ("scm_read_r6rs_block_comment", port, |
620c8965 LC |
1149 | "unterminated `#| ... |#' comment", SCM_EOL); |
1150 | ||
6d5f8c32 AW |
1151 | if (a == '|' && b == '#') |
1152 | { | |
1153 | nesting_level--; | |
1154 | b = EOF; | |
1155 | } | |
1156 | else if (a == '#' && b == '|') | |
1157 | { | |
1158 | nesting_level++; | |
1159 | b = EOF; | |
1160 | } | |
1161 | ||
1162 | a = b; | |
620c8965 LC |
1163 | } |
1164 | ||
1165 | return SCM_UNSPECIFIED; | |
1166 | } | |
1167 | ||
34f3d47d | 1168 | static SCM |
889975e5 | 1169 | scm_read_commented_expression (scm_t_wchar chr, SCM port) |
34f3d47d | 1170 | { |
889975e5 | 1171 | scm_t_wchar c; |
34f3d47d AW |
1172 | |
1173 | c = flush_ws (port, (char *) NULL); | |
1174 | if (EOF == c) | |
1175 | scm_i_input_error ("read_commented_expression", port, | |
1176 | "no expression after #; comment", SCM_EOL); | |
1177 | scm_ungetc (c, port); | |
1178 | scm_read_expression (port); | |
1179 | return SCM_UNSPECIFIED; | |
1180 | } | |
1181 | ||
7337d56d | 1182 | static SCM |
889975e5 | 1183 | scm_read_extended_symbol (scm_t_wchar chr, SCM port) |
7337d56d LC |
1184 | { |
1185 | /* Guile's extended symbol read syntax looks like this: | |
1186 | ||
1187 | #{This is all a symbol name}# | |
1188 | ||
1189 | So here, CHR is expected to be `{'. */ | |
d9527cfa | 1190 | int saw_brace = 0; |
7337d56d | 1191 | size_t len = 0; |
190d4b0d | 1192 | SCM buf = scm_i_make_string (1024, NULL, 0); |
7337d56d | 1193 | |
889975e5 | 1194 | buf = scm_i_string_start_writing (buf); |
7337d56d LC |
1195 | |
1196 | while ((chr = scm_getc (port)) != EOF) | |
1197 | { | |
1198 | if (saw_brace) | |
09a4f039 | 1199 | { |
7337d56d LC |
1200 | if (chr == '#') |
1201 | { | |
7337d56d LC |
1202 | break; |
1203 | } | |
1204 | else | |
1205 | { | |
1206 | saw_brace = 0; | |
889975e5 | 1207 | scm_i_string_set_x (buf, len++, '}'); |
7337d56d | 1208 | } |
09a4f039 | 1209 | } |
d9527cfa AW |
1210 | |
1211 | if (chr == '}') | |
7337d56d | 1212 | saw_brace = 1; |
d9527cfa AW |
1213 | else if (chr == '\\') |
1214 | { | |
1215 | /* It used to be that print.c would print extended-read-syntax | |
1216 | symbols with backslashes before "non-standard" chars, but | |
1217 | this routine wouldn't do anything with those escapes. | |
1218 | Bummer. What we've done is to change print.c to output | |
1219 | R6RS hex escapes for those characters, relying on the fact | |
1220 | that the extended read syntax would never put a `\' before | |
1221 | an `x'. For now, we just ignore other instances of | |
1222 | backslash in the string. */ | |
1223 | switch ((chr = scm_getc (port))) | |
1224 | { | |
1225 | case EOF: | |
1226 | goto done; | |
1227 | case 'x': | |
1228 | { | |
1229 | scm_t_wchar c; | |
1230 | ||
1231 | SCM_READ_HEX_ESCAPE (10, ';'); | |
1232 | scm_i_string_set_x (buf, len++, c); | |
1233 | break; | |
1234 | ||
1235 | str_eof: | |
1236 | chr = EOF; | |
1237 | goto done; | |
1238 | ||
1239 | bad_escaped: | |
1240 | scm_i_string_stop_writing (); | |
1241 | scm_i_input_error ("scm_read_extended_symbol", port, | |
1242 | "illegal character in escape sequence: ~S", | |
1243 | scm_list_1 (SCM_MAKE_CHAR (c))); | |
1244 | break; | |
1245 | } | |
1246 | default: | |
1247 | scm_i_string_set_x (buf, len++, chr); | |
1248 | break; | |
1249 | } | |
1250 | } | |
7337d56d | 1251 | else |
d9527cfa | 1252 | scm_i_string_set_x (buf, len++, chr); |
62850ef3 | 1253 | |
889975e5 | 1254 | if (len >= scm_i_string_length (buf) - 2) |
7337d56d | 1255 | { |
7f991c7d LC |
1256 | SCM addy; |
1257 | ||
889975e5 | 1258 | scm_i_string_stop_writing (); |
190d4b0d | 1259 | addy = scm_i_make_string (1024, NULL, 0); |
889975e5 | 1260 | buf = scm_string_append (scm_list_2 (buf, addy)); |
7337d56d | 1261 | len = 0; |
889975e5 | 1262 | buf = scm_i_string_start_writing (buf); |
7337d56d | 1263 | } |
7337d56d | 1264 | } |
d9527cfa AW |
1265 | |
1266 | done: | |
889975e5 | 1267 | scm_i_string_stop_writing (); |
d9527cfa AW |
1268 | if (chr == EOF) |
1269 | scm_i_input_error ("scm_read_extended_symbol", port, | |
1270 | "end of file while reading symbol", SCM_EOL); | |
7337d56d | 1271 | |
889975e5 | 1272 | return (scm_string_to_symbol (scm_c_substring (buf, 0, len))); |
7337d56d LC |
1273 | } |
1274 | ||
1275 | ||
1276 | \f | |
1277 | /* Top-level token readers, i.e., dispatchers. */ | |
1278 | ||
1279 | static SCM | |
1280 | scm_read_sharp_extension (int chr, SCM port) | |
1281 | { | |
1282 | SCM proc; | |
1283 | ||
1284 | proc = scm_get_hash_procedure (chr); | |
1285 | if (scm_is_true (scm_procedure_p (proc))) | |
1286 | { | |
1287 | long line = SCM_LINUM (port); | |
1288 | int column = SCM_COL (port) - 2; | |
1289 | SCM got; | |
1290 | ||
1291 | got = scm_call_2 (proc, SCM_MAKE_CHAR (chr), port); | |
26c8cc14 AW |
1292 | |
1293 | if (scm_is_pair (got) && !scm_i_has_source_properties (got)) | |
1294 | scm_i_set_source_properties_x (got, line, column, SCM_FILENAME (port)); | |
1295 | ||
1296 | return got; | |
09a4f039 | 1297 | } |
7337d56d LC |
1298 | |
1299 | return SCM_UNSPECIFIED; | |
1300 | } | |
1301 | ||
1302 | /* The reader for the sharp `#' character. It basically dispatches reads | |
1303 | among the above token readers. */ | |
1304 | static SCM | |
889975e5 | 1305 | scm_read_sharp (scm_t_wchar chr, SCM port) |
7337d56d LC |
1306 | #define FUNC_NAME "scm_lreadr" |
1307 | { | |
1308 | SCM result; | |
1309 | ||
1310 | chr = scm_getc (port); | |
1311 | ||
1312 | result = scm_read_sharp_extension (chr, port); | |
1313 | if (!scm_is_eq (result, SCM_UNSPECIFIED)) | |
1314 | return result; | |
1315 | ||
1316 | switch (chr) | |
1317 | { | |
1318 | case '\\': | |
1319 | return (scm_read_character (chr, port)); | |
1320 | case '(': | |
1321 | return (scm_read_vector (chr, port)); | |
1322 | case 's': | |
1323 | case 'u': | |
1324 | case 'f': | |
df941b5b | 1325 | case 'c': |
7337d56d LC |
1326 | /* This one may return either a boolean or an SRFI-4 vector. */ |
1327 | return (scm_read_srfi4_vector (chr, port)); | |
0ba0b384 LC |
1328 | case 'v': |
1329 | return (scm_read_bytevector (chr, port)); | |
7337d56d LC |
1330 | case '*': |
1331 | return (scm_read_guile_bit_vector (chr, port)); | |
1332 | case 't': | |
1333 | case 'T': | |
1334 | case 'F': | |
1335 | /* This one may return either a boolean or an SRFI-4 vector. */ | |
1336 | return (scm_read_boolean (chr, port)); | |
1337 | case ':': | |
1338 | return (scm_read_keyword (chr, port)); | |
1339 | case '0': case '1': case '2': case '3': case '4': | |
1340 | case '5': case '6': case '7': case '8': case '9': | |
1341 | case '@': | |
1342 | #if SCM_ENABLE_DEPRECATED | |
1343 | /* See below for 'i' and 'e'. */ | |
1344 | case 'a': | |
7337d56d LC |
1345 | case 'y': |
1346 | case 'h': | |
1347 | case 'l': | |
1348 | #endif | |
1349 | return (scm_i_read_array (port, chr)); | |
1350 | ||
1351 | case 'i': | |
1352 | case 'e': | |
1353 | #if SCM_ENABLE_DEPRECATED | |
1354 | { | |
1355 | /* When next char is '(', it really is an old-style | |
1356 | uniform array. */ | |
889975e5 | 1357 | scm_t_wchar next_c = scm_getc (port); |
7337d56d LC |
1358 | if (next_c != EOF) |
1359 | scm_ungetc (next_c, port); | |
1360 | if (next_c == '(') | |
1361 | return scm_i_read_array (port, chr); | |
1362 | /* Fall through. */ | |
1363 | } | |
1364 | #endif | |
1365 | case 'b': | |
1366 | case 'B': | |
1367 | case 'o': | |
1368 | case 'O': | |
1369 | case 'd': | |
1370 | case 'D': | |
1371 | case 'x': | |
1372 | case 'X': | |
1373 | case 'I': | |
1374 | case 'E': | |
1375 | return (scm_read_number_and_radix (chr, port)); | |
1376 | case '{': | |
1377 | return (scm_read_extended_symbol (chr, port)); | |
1378 | case '!': | |
911b03b2 | 1379 | return (scm_read_shebang (chr, port)); |
34f3d47d AW |
1380 | case ';': |
1381 | return (scm_read_commented_expression (chr, port)); | |
1382 | case '`': | |
1383 | case '\'': | |
1384 | case ',': | |
1385 | return (scm_read_syntax (chr, port)); | |
7c4aad9c AW |
1386 | case 'n': |
1387 | return (scm_read_nil (chr, port)); | |
7337d56d LC |
1388 | default: |
1389 | result = scm_read_sharp_extension (chr, port); | |
1390 | if (scm_is_eq (result, SCM_UNSPECIFIED)) | |
620c8965 LC |
1391 | { |
1392 | /* To remain compatible with 1.8 and earlier, the following | |
1393 | characters have lower precedence than `read-hash-extend' | |
1394 | characters. */ | |
1395 | switch (chr) | |
1396 | { | |
1397 | case '|': | |
1398 | return scm_read_r6rs_block_comment (chr, port); | |
1399 | default: | |
1400 | scm_i_input_error (FUNC_NAME, port, "Unknown # object: ~S", | |
1401 | scm_list_1 (SCM_MAKE_CHAR (chr))); | |
1402 | } | |
1403 | } | |
7337d56d LC |
1404 | else |
1405 | return result; | |
1406 | } | |
1407 | ||
1408 | return SCM_UNSPECIFIED; | |
1409 | } | |
1410 | #undef FUNC_NAME | |
1411 | ||
1412 | static SCM | |
1413 | scm_read_expression (SCM port) | |
1414 | #define FUNC_NAME "scm_read_expression" | |
1415 | { | |
1416 | while (1) | |
1417 | { | |
889975e5 | 1418 | register scm_t_wchar chr; |
7337d56d LC |
1419 | |
1420 | chr = scm_getc (port); | |
1421 | ||
1422 | switch (chr) | |
1423 | { | |
1424 | case SCM_WHITE_SPACES: | |
1425 | case SCM_LINE_INCREMENTORS: | |
1426 | break; | |
1427 | case ';': | |
1428 | (void) scm_read_semicolon_comment (chr, port); | |
1429 | break; | |
5afa815c AW |
1430 | case '[': |
1431 | if (!SCM_SQUARE_BRACKETS_P) | |
1432 | return (scm_read_mixed_case_symbol (chr, port)); | |
1433 | /* otherwise fall through */ | |
7337d56d LC |
1434 | case '(': |
1435 | return (scm_read_sexp (chr, port)); | |
1436 | case '"': | |
1437 | return (scm_read_string (chr, port)); | |
1438 | case '\'': | |
1439 | case '`': | |
1440 | case ',': | |
1441 | return (scm_read_quote (chr, port)); | |
1442 | case '#': | |
1443 | { | |
1444 | SCM result; | |
1445 | result = scm_read_sharp (chr, port); | |
1446 | if (scm_is_eq (result, SCM_UNSPECIFIED)) | |
1447 | /* We read a comment or some such. */ | |
1448 | break; | |
1449 | else | |
1450 | return result; | |
1451 | } | |
1452 | case ')': | |
1453 | scm_i_input_error (FUNC_NAME, port, "unexpected \")\"", SCM_EOL); | |
1454 | break; | |
a4e47229 MG |
1455 | case ']': |
1456 | if (SCM_SQUARE_BRACKETS_P) | |
1457 | scm_i_input_error (FUNC_NAME, port, "unexpected \"]\"", SCM_EOL); | |
1458 | /* otherwise fall through */ | |
7337d56d LC |
1459 | case EOF: |
1460 | return SCM_EOF_VAL; | |
1461 | case ':': | |
1462 | if (scm_is_eq (SCM_PACK (SCM_KEYWORD_STYLE), scm_keyword_prefix)) | |
1463 | return scm_symbol_to_keyword (scm_read_expression (port)); | |
1464 | /* Fall through. */ | |
1465 | ||
1466 | default: | |
1467 | { | |
1468 | if (((chr >= '0') && (chr <= '9')) | |
1469 | || (strchr ("+-.", chr))) | |
1470 | return (scm_read_number (chr, port)); | |
1471 | else | |
1472 | return (scm_read_mixed_case_symbol (chr, port)); | |
1473 | } | |
1474 | } | |
1475 | } | |
1476 | } | |
1477 | #undef FUNC_NAME | |
1478 | ||
1479 | \f | |
1480 | /* Actual reader. */ | |
1481 | ||
1482 | SCM_DEFINE (scm_read, "read", 0, 1, 0, | |
1483 | (SCM port), | |
1484 | "Read an s-expression from the input port @var{port}, or from\n" | |
1485 | "the current input port if @var{port} is not specified.\n" | |
1486 | "Any whitespace before the next token is discarded.") | |
1487 | #define FUNC_NAME s_scm_read | |
1488 | { | |
1489 | int c; | |
1490 | ||
1491 | if (SCM_UNBNDP (port)) | |
1492 | port = scm_current_input_port (); | |
1493 | SCM_VALIDATE_OPINPORT (1, port); | |
1494 | ||
1495 | c = flush_ws (port, (char *) NULL); | |
1496 | if (EOF == c) | |
1497 | return SCM_EOF_VAL; | |
1498 | scm_ungetc (c, port); | |
1499 | ||
1500 | return (scm_read_expression (port)); | |
09a4f039 | 1501 | } |
db4b4ca6 | 1502 | #undef FUNC_NAME |
09a4f039 | 1503 | |
0f2d19dd JB |
1504 | |
1505 | \f | |
1506 | ||
14de3b42 GH |
1507 | /* Manipulate the read-hash-procedures alist. This could be written in |
1508 | Scheme, but maybe it will also be used by C code during initialisation. */ | |
a1ec6916 | 1509 | SCM_DEFINE (scm_read_hash_extend, "read-hash-extend", 2, 0, 0, |
1bbd0b84 | 1510 | (SCM chr, SCM proc), |
dc7fa443 MG |
1511 | "Install the procedure @var{proc} for reading expressions\n" |
1512 | "starting with the character sequence @code{#} and @var{chr}.\n" | |
1513 | "@var{proc} will be called with two arguments: the character\n" | |
1514 | "@var{chr} and the port to read further data from. The object\n" | |
391f57e6 HWN |
1515 | "returned will be the return value of @code{read}. \n" |
1516 | "Passing @code{#f} for @var{proc} will remove a previous setting. \n" | |
1517 | ) | |
1bbd0b84 | 1518 | #define FUNC_NAME s_scm_read_hash_extend |
deca31e1 | 1519 | { |
fed9c9a2 GH |
1520 | SCM this; |
1521 | SCM prev; | |
1522 | ||
36284627 | 1523 | SCM_VALIDATE_CHAR (1, chr); |
7888309b | 1524 | SCM_ASSERT (scm_is_false (proc) |
bc36d050 | 1525 | || scm_is_eq (scm_procedure_p (proc), SCM_BOOL_T), |
36284627 | 1526 | proc, SCM_ARG2, FUNC_NAME); |
fed9c9a2 | 1527 | |
14de3b42 | 1528 | /* Check if chr is already in the alist. */ |
d458073b | 1529 | this = scm_i_read_hash_procedures_ref (); |
14de3b42 | 1530 | prev = SCM_BOOL_F; |
fed9c9a2 GH |
1531 | while (1) |
1532 | { | |
d2e53ed6 | 1533 | if (scm_is_null (this)) |
fed9c9a2 GH |
1534 | { |
1535 | /* not found, so add it to the beginning. */ | |
7888309b | 1536 | if (scm_is_true (proc)) |
fed9c9a2 | 1537 | { |
d458073b AR |
1538 | SCM new = scm_cons (scm_cons (chr, proc), |
1539 | scm_i_read_hash_procedures_ref ()); | |
1540 | scm_i_read_hash_procedures_set_x (new); | |
fed9c9a2 GH |
1541 | } |
1542 | break; | |
1543 | } | |
bc36d050 | 1544 | if (scm_is_eq (chr, SCM_CAAR (this))) |
fed9c9a2 GH |
1545 | { |
1546 | /* already in the alist. */ | |
7888309b | 1547 | if (scm_is_false (proc)) |
14de3b42 GH |
1548 | { |
1549 | /* remove it. */ | |
7888309b | 1550 | if (scm_is_false (prev)) |
14de3b42 | 1551 | { |
d458073b AR |
1552 | SCM rest = SCM_CDR (scm_i_read_hash_procedures_ref ()); |
1553 | scm_i_read_hash_procedures_set_x (rest); | |
14de3b42 GH |
1554 | } |
1555 | else | |
1556 | scm_set_cdr_x (prev, SCM_CDR (this)); | |
1557 | } | |
fed9c9a2 | 1558 | else |
14de3b42 GH |
1559 | { |
1560 | /* replace it. */ | |
1561 | scm_set_cdr_x (SCM_CAR (this), proc); | |
1562 | } | |
fed9c9a2 GH |
1563 | break; |
1564 | } | |
1565 | prev = this; | |
1566 | this = SCM_CDR (this); | |
1567 | } | |
deca31e1 | 1568 | |
deca31e1 GH |
1569 | return SCM_UNSPECIFIED; |
1570 | } | |
1bbd0b84 | 1571 | #undef FUNC_NAME |
0f2d19dd | 1572 | |
deca31e1 GH |
1573 | /* Recover the read-hash procedure corresponding to char c. */ |
1574 | static SCM | |
6e8d25a6 | 1575 | scm_get_hash_procedure (int c) |
deca31e1 | 1576 | { |
d458073b | 1577 | SCM rest = scm_i_read_hash_procedures_ref (); |
fed9c9a2 | 1578 | |
deca31e1 GH |
1579 | while (1) |
1580 | { | |
d2e53ed6 | 1581 | if (scm_is_null (rest)) |
deca31e1 GH |
1582 | return SCM_BOOL_F; |
1583 | ||
7866a09b | 1584 | if (SCM_CHAR (SCM_CAAR (rest)) == c) |
deca31e1 GH |
1585 | return SCM_CDAR (rest); |
1586 | ||
1587 | rest = SCM_CDR (rest); | |
1588 | } | |
1589 | } | |
1cc91f1b | 1590 | |
889975e5 MG |
1591 | #define SCM_ENCODING_SEARCH_SIZE (500) |
1592 | ||
f8a1c9a8 LC |
1593 | /* Search the first few hundred characters of a file for an Emacs-like coding |
1594 | declaration. Returns either NULL or a string whose storage has been | |
1595 | allocated with `scm_gc_malloc ()'. */ | |
889975e5 | 1596 | char * |
f8a1c9a8 | 1597 | scm_i_scan_for_encoding (SCM port) |
889975e5 | 1598 | { |
d900843c | 1599 | scm_t_port *pt; |
889975e5 | 1600 | char header[SCM_ENCODING_SEARCH_SIZE+1]; |
daedbca7 | 1601 | size_t bytes_read, encoding_length, i; |
889975e5 MG |
1602 | char *encoding = NULL; |
1603 | int utf8_bom = 0; | |
daedbca7 | 1604 | char *pos, *encoding_start; |
889975e5 MG |
1605 | int in_comment; |
1606 | ||
d900843c | 1607 | pt = SCM_PTAB_ENTRY (port); |
49bb5bd3 | 1608 | |
d900843c AW |
1609 | if (pt->rw_active == SCM_PORT_WRITE) |
1610 | scm_flush (port); | |
49bb5bd3 | 1611 | |
d900843c AW |
1612 | if (pt->rw_random) |
1613 | pt->rw_active = SCM_PORT_READ; | |
1614 | ||
1615 | if (pt->read_pos == pt->read_end) | |
1616 | { | |
1617 | /* We can use the read buffer, and thus avoid a seek. */ | |
1618 | if (scm_fill_input (port) == EOF) | |
1619 | return NULL; | |
1620 | ||
1621 | bytes_read = pt->read_end - pt->read_pos; | |
1622 | if (bytes_read > SCM_ENCODING_SEARCH_SIZE) | |
1623 | bytes_read = SCM_ENCODING_SEARCH_SIZE; | |
1624 | ||
1625 | if (bytes_read <= 1) | |
1626 | /* An unbuffered port -- don't scan. */ | |
1627 | return NULL; | |
1628 | ||
1629 | memcpy (header, pt->read_pos, bytes_read); | |
1630 | header[bytes_read] = '\0'; | |
1631 | } | |
1632 | else | |
1633 | { | |
1634 | /* Try to read some bytes and then seek back. Not all ports | |
1635 | support seeking back; and indeed some file ports (like | |
1636 | /dev/urandom) will succeed on an lseek (fd, 0, SEEK_CUR)---the | |
1637 | check performed by SCM_FPORT_FDES---but fail to seek | |
1638 | backwards. Hence this block comes second. We prefer to use | |
1639 | the read buffer in-place. */ | |
1640 | if (SCM_FPORTP (port) && !SCM_FDES_RANDOM_P (SCM_FPORT_FDES (port))) | |
1641 | return NULL; | |
1642 | ||
1643 | bytes_read = scm_c_read (port, header, SCM_ENCODING_SEARCH_SIZE); | |
1644 | header[bytes_read] = '\0'; | |
1645 | scm_seek (port, scm_from_int (0), scm_from_int (SEEK_SET)); | |
1646 | } | |
889975e5 MG |
1647 | |
1648 | if (bytes_read > 3 | |
1649 | && header[0] == '\xef' && header[1] == '\xbb' && header[2] == '\xbf') | |
1650 | utf8_bom = 1; | |
1651 | ||
1652 | /* search past "coding[:=]" */ | |
1653 | pos = header; | |
1654 | while (1) | |
1655 | { | |
1656 | if ((pos = strstr(pos, "coding")) == NULL) | |
1657 | return NULL; | |
1658 | ||
1659 | pos += strlen("coding"); | |
1660 | if (pos - header >= SCM_ENCODING_SEARCH_SIZE || | |
1661 | (*pos == ':' || *pos == '=')) | |
1662 | { | |
1663 | pos ++; | |
1664 | break; | |
1665 | } | |
1666 | } | |
1667 | ||
1668 | /* skip spaces */ | |
1669 | while (pos - header <= SCM_ENCODING_SEARCH_SIZE && | |
1670 | (*pos == ' ' || *pos == '\t')) | |
1671 | pos ++; | |
1672 | ||
1673 | /* grab the next token */ | |
daedbca7 | 1674 | encoding_start = pos; |
889975e5 | 1675 | i = 0; |
daedbca7 MG |
1676 | while (encoding_start + i - header <= SCM_ENCODING_SEARCH_SIZE |
1677 | && encoding_start + i - header < bytes_read | |
1678 | && (isalnum ((int) encoding_start[i]) | |
1679 | || strchr ("_-.:/,+=()", encoding_start[i]) != NULL)) | |
889975e5 MG |
1680 | i++; |
1681 | ||
daedbca7 MG |
1682 | encoding_length = i; |
1683 | if (encoding_length == 0) | |
889975e5 MG |
1684 | return NULL; |
1685 | ||
daedbca7 MG |
1686 | encoding = scm_gc_strndup (encoding_start, encoding_length, "encoding"); |
1687 | for (i = 0; i < encoding_length; i++) | |
026ed239 | 1688 | encoding[i] = toupper ((int) encoding[i]); |
889975e5 MG |
1689 | |
1690 | /* push backwards to make sure we were in a comment */ | |
1691 | in_comment = 0; | |
daedbca7 MG |
1692 | pos = encoding_start; |
1693 | while (pos >= header) | |
889975e5 | 1694 | { |
8a12aeb9 AW |
1695 | if (*pos == ';') |
1696 | { | |
1697 | in_comment = 1; | |
1698 | break; | |
1699 | } | |
1700 | else if (*pos == '\n' || pos == header) | |
889975e5 MG |
1701 | { |
1702 | /* This wasn't in a semicolon comment. Check for a | |
1703 | hash-bang comment. */ | |
1704 | char *beg = strstr (header, "#!"); | |
1705 | char *end = strstr (header, "!#"); | |
8a12aeb9 | 1706 | if (beg < encoding_start && encoding_start + encoding_length <= end) |
889975e5 MG |
1707 | in_comment = 1; |
1708 | break; | |
1709 | } | |
8a12aeb9 AW |
1710 | else |
1711 | { | |
1712 | pos --; | |
1713 | continue; | |
1714 | } | |
889975e5 MG |
1715 | } |
1716 | if (!in_comment) | |
f8a1c9a8 LC |
1717 | /* This wasn't in a comment */ |
1718 | return NULL; | |
1719 | ||
889975e5 | 1720 | if (utf8_bom && strcmp(encoding, "UTF-8")) |
daedbca7 | 1721 | scm_misc_error (NULL, |
889975e5 MG |
1722 | "the port input declares the encoding ~s but is encoded as UTF-8", |
1723 | scm_list_1 (scm_from_locale_string (encoding))); | |
f8a1c9a8 | 1724 | |
889975e5 MG |
1725 | return encoding; |
1726 | } | |
1727 | ||
1728 | SCM_DEFINE (scm_file_encoding, "file-encoding", 1, 0, 0, | |
1729 | (SCM port), | |
a270e133 | 1730 | "Scans the port for an Emacs-like character coding declaration\n" |
ffb62a43 | 1731 | "near the top of the contents of a port with random-accessible contents.\n" |
889975e5 MG |
1732 | "The coding declaration is of the form\n" |
1733 | "@code{coding: XXXXX} and must appear in a scheme comment.\n" | |
1734 | "\n" | |
1735 | "Returns a string containing the character encoding of the file\n" | |
1736 | "if a declaration was found, or @code{#f} otherwise.\n") | |
1737 | #define FUNC_NAME s_scm_file_encoding | |
1738 | { | |
1739 | char *enc; | |
1740 | SCM s_enc; | |
f8a1c9a8 | 1741 | |
d900843c AW |
1742 | SCM_VALIDATE_OPINPORT (SCM_ARG1, port); |
1743 | ||
f8a1c9a8 | 1744 | enc = scm_i_scan_for_encoding (port); |
889975e5 MG |
1745 | if (enc == NULL) |
1746 | return SCM_BOOL_F; | |
1747 | else | |
1748 | { | |
1749 | s_enc = scm_from_locale_string (enc); | |
889975e5 MG |
1750 | return s_enc; |
1751 | } | |
f8a1c9a8 | 1752 | |
889975e5 MG |
1753 | return SCM_BOOL_F; |
1754 | } | |
1755 | #undef FUNC_NAME | |
1756 | ||
0f2d19dd JB |
1757 | void |
1758 | scm_init_read () | |
0f2d19dd | 1759 | { |
d458073b AR |
1760 | SCM read_hash_procs; |
1761 | ||
c81c2ad3 | 1762 | read_hash_procs = scm_make_fluid_with_default (SCM_EOL); |
d458073b AR |
1763 | |
1764 | scm_i_read_hash_procedures = | |
1765 | SCM_VARIABLE_LOC (scm_c_define ("%read-hash-procedures", read_hash_procs)); | |
fed9c9a2 | 1766 | |
62560650 | 1767 | scm_init_opts (scm_read_options, scm_read_opts); |
a0599745 | 1768 | #include "libguile/read.x" |
0f2d19dd | 1769 | } |
89e00824 ML |
1770 | |
1771 | /* | |
1772 | Local Variables: | |
1773 | c-file-style: "gnu" | |
1774 | End: | |
1775 | */ |