Commit | Line | Data |
---|---|---|
58996e37 MW |
1 | /* Copyright (C) 1995, 1996, 1997, 1999, 2000, 2001, 2003, 2004, 2006, |
2 | * 2007, 2008, 2009, 2010, 2011, 2012 Free Software 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 | |
cfd15439 | 145 | static SCM |
d458073b AR |
146 | scm_i_read_hash_procedures_ref (void) |
147 | { | |
148 | return scm_fluid_ref (*scm_i_read_hash_procedures); | |
149 | } | |
150 | ||
cfd15439 | 151 | static void |
d458073b AR |
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 | |
ff4d3672 LC |
164 | /* Number of 32-bit codepoints in the buffer used to read strings. */ |
165 | #define READER_STRING_BUFFER_SIZE 128 | |
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. */ |
cfd15439 | 200 | static SCM scm_read_scsh_block_comment (scm_t_wchar, SCM); |
620c8965 LC |
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. */ | |
cfd15439 | 210 | static int |
b662b7e9 LC |
211 | read_token (SCM port, char *buf, size_t buf_size, size_t *read) |
212 | { | |
69f90b0b | 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 | |
b662b7e9 LC |
238 | /* Like `read_token', but return either BUFFER, or a GC-allocated buffer |
239 | if the token doesn't fit in BUFFER_SIZE bytes. */ | |
240 | static char * | |
241 | read_complete_token (SCM port, char *buffer, size_t buffer_size, | |
242 | size_t *read) | |
69f90b0b MG |
243 | { |
244 | int overflow = 0; | |
b662b7e9 LC |
245 | size_t bytes_read, overflow_size = 0; |
246 | char *overflow_buffer = NULL; | |
1cc91f1b | 247 | |
69f90b0b MG |
248 | do |
249 | { | |
250 | overflow = read_token (port, buffer, buffer_size, &bytes_read); | |
251 | if (bytes_read == 0) | |
252 | break; | |
253 | if (overflow || overflow_size != 0) | |
254 | { | |
255 | if (overflow_size == 0) | |
256 | { | |
b662b7e9 LC |
257 | overflow_buffer = scm_gc_malloc_pointerless (bytes_read, "read"); |
258 | memcpy (overflow_buffer, buffer, bytes_read); | |
69f90b0b MG |
259 | overflow_size = bytes_read; |
260 | } | |
261 | else | |
262 | { | |
7be3c2fc | 263 | char *new_buf = |
b662b7e9 LC |
264 | scm_gc_malloc_pointerless (overflow_size + bytes_read, "read"); |
265 | ||
266 | memcpy (new_buf, overflow_buffer, overflow_size); | |
267 | memcpy (new_buf + overflow_size, buffer, bytes_read); | |
268 | ||
269 | overflow_buffer = new_buf; | |
69f90b0b MG |
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 | ||
b662b7e9 | 281 | return (overflow_size > 0 ? overflow_buffer : buffer); |
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 | { |
cfd15439 | 289 | 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 | 358 | static SCM scm_read_expression (SCM port); |
b131b233 | 359 | static SCM scm_read_sharp (int chr, SCM port, long line, int column); |
0f2d19dd JB |
360 | |
361 | ||
d6cb0203 MW |
362 | static SCM |
363 | maybe_annotate_source (SCM x, SCM port, long line, int column) | |
364 | { | |
365 | if (SCM_RECORD_POSITIONS_P) | |
366 | scm_i_set_source_properties_x (x, line, column, SCM_FILENAME (port)); | |
367 | return x; | |
368 | } | |
369 | ||
09a4f039 | 370 | static SCM |
889975e5 | 371 | scm_read_sexp (scm_t_wchar chr, SCM port) |
7337d56d | 372 | #define FUNC_NAME "scm_i_lreadparen" |
09a4f039 | 373 | { |
26c8cc14 AW |
374 | int c; |
375 | SCM tmp, tl, ans = SCM_EOL; | |
5afa815c | 376 | const int terminating_char = ((chr == '[') ? ']' : ')'); |
7337d56d LC |
377 | |
378 | /* Need to capture line and column numbers here. */ | |
379 | long line = SCM_LINUM (port); | |
380 | int column = SCM_COL (port) - 1; | |
f9c68a47 | 381 | |
7337d56d LC |
382 | c = flush_ws (port, FUNC_NAME); |
383 | if (terminating_char == c) | |
384 | return SCM_EOL; | |
f9c68a47 | 385 | |
7337d56d | 386 | scm_ungetc (c, port); |
1f7945a7 AW |
387 | tmp = scm_read_expression (port); |
388 | ||
389 | /* Note that it is possible for scm_read_expression to return | |
390 | scm_sym_dot, but not as part of a dotted pair: as in #{.}#. So | |
391 | check that it's a real dot by checking `c'. */ | |
392 | if (c == '.' && scm_is_eq (scm_sym_dot, tmp)) | |
7337d56d LC |
393 | { |
394 | ans = scm_read_expression (port); | |
395 | if (terminating_char != (c = flush_ws (port, FUNC_NAME))) | |
396 | scm_i_input_error (FUNC_NAME, port, "missing close paren", | |
397 | SCM_EOL); | |
398 | return ans; | |
399 | } | |
1cc91f1b | 400 | |
7337d56d LC |
401 | /* Build the head of the list structure. */ |
402 | ans = tl = scm_cons (tmp, SCM_EOL); | |
403 | ||
7337d56d | 404 | while (terminating_char != (c = flush_ws (port, FUNC_NAME))) |
0f2d19dd | 405 | { |
7337d56d | 406 | SCM new_tail; |
0f2d19dd | 407 | |
5b69315e AW |
408 | if (c == ')' || (SCM_SQUARE_BRACKETS_P && c == ']')) |
409 | scm_i_input_error (FUNC_NAME, port, | |
410 | "in pair: mismatched close paren: ~A", | |
411 | scm_list_1 (SCM_MAKE_CHAR (c))); | |
412 | ||
7337d56d | 413 | scm_ungetc (c, port); |
5b69315e AW |
414 | tmp = scm_read_expression (port); |
415 | ||
1f7945a7 AW |
416 | /* See above note about scm_sym_dot. */ |
417 | if (c == '.' && scm_is_eq (scm_sym_dot, tmp)) | |
0f2d19dd | 418 | { |
89f88612 | 419 | SCM_SETCDR (tl, scm_read_expression (port)); |
7337d56d | 420 | |
7337d56d LC |
421 | c = flush_ws (port, FUNC_NAME); |
422 | if (terminating_char != c) | |
423 | scm_i_input_error (FUNC_NAME, port, | |
424 | "in pair: missing close paren", SCM_EOL); | |
425 | goto exit; | |
0f2d19dd | 426 | } |
b858464a | 427 | |
7337d56d LC |
428 | new_tail = scm_cons (tmp, SCM_EOL); |
429 | SCM_SETCDR (tl, new_tail); | |
430 | tl = new_tail; | |
7337d56d | 431 | } |
0f2d19dd | 432 | |
7337d56d | 433 | exit: |
d6cb0203 | 434 | return maybe_annotate_source (ans, port, line, column); |
7337d56d LC |
435 | } |
436 | #undef FUNC_NAME | |
a4022e69 | 437 | |
c5661d28 MG |
438 | |
439 | /* Read a hexadecimal number NDIGITS in length. Put its value into the variable | |
dea901d6 MG |
440 | C. If TERMINATOR is non-null, terminate early if the TERMINATOR character is |
441 | found. */ | |
442 | #define SCM_READ_HEX_ESCAPE(ndigits, terminator) \ | |
443 | do \ | |
444 | { \ | |
445 | scm_t_wchar a; \ | |
446 | size_t i = 0; \ | |
447 | c = 0; \ | |
448 | while (i < ndigits) \ | |
449 | { \ | |
450 | a = scm_getc (port); \ | |
451 | if (a == EOF) \ | |
452 | goto str_eof; \ | |
453 | if (terminator \ | |
454 | && (a == (scm_t_wchar) terminator) \ | |
455 | && (i > 0)) \ | |
456 | break; \ | |
457 | if ('0' <= a && a <= '9') \ | |
458 | a -= '0'; \ | |
459 | else if ('A' <= a && a <= 'F') \ | |
460 | a = a - 'A' + 10; \ | |
461 | else if ('a' <= a && a <= 'f') \ | |
462 | a = a - 'a' + 10; \ | |
463 | else \ | |
464 | { \ | |
465 | c = a; \ | |
466 | goto bad_escaped; \ | |
467 | } \ | |
468 | c = c * 16 + a; \ | |
469 | i ++; \ | |
470 | } \ | |
c5661d28 MG |
471 | } while (0) |
472 | ||
684d664e AW |
473 | static void |
474 | skip_intraline_whitespace (SCM port) | |
475 | { | |
476 | scm_t_wchar c; | |
477 | ||
478 | do | |
479 | { | |
480 | c = scm_getc (port); | |
481 | if (c == EOF) | |
482 | return; | |
483 | } | |
484 | while (c == '\t' || uc_is_general_category (c, UC_SPACE_SEPARATOR)); | |
485 | ||
486 | scm_ungetc (c, port); | |
487 | } | |
488 | ||
7337d56d LC |
489 | static SCM |
490 | scm_read_string (int chr, SCM port) | |
491 | #define FUNC_NAME "scm_lreadr" | |
492 | { | |
493 | /* For strings smaller than C_STR, this function creates only one Scheme | |
494 | object (the string returned). */ | |
0f2d19dd | 495 | |
ff4d3672 LC |
496 | SCM str = SCM_EOL; |
497 | size_t c_str_len = 0; | |
498 | scm_t_wchar c, c_str[READER_STRING_BUFFER_SIZE]; | |
eb42ff25 | 499 | |
b131b233 MW |
500 | /* Need to capture line and column numbers here. */ |
501 | long line = SCM_LINUM (port); | |
502 | int column = SCM_COL (port) - 1; | |
503 | ||
7337d56d LC |
504 | while ('"' != (c = scm_getc (port))) |
505 | { | |
506 | if (c == EOF) | |
9c44cd45 MG |
507 | { |
508 | str_eof: | |
509 | scm_i_input_error (FUNC_NAME, port, | |
510 | "end of file in string constant", SCM_EOL); | |
511 | } | |
0f2d19dd | 512 | |
ff4d3672 LC |
513 | if (c_str_len + 1 >= READER_STRING_BUFFER_SIZE) |
514 | { | |
515 | str = scm_cons (scm_from_utf32_stringn (c_str, c_str_len), str); | |
516 | c_str_len = 0; | |
517 | } | |
0f2d19dd | 518 | |
7337d56d | 519 | if (c == '\\') |
9c44cd45 MG |
520 | { |
521 | switch (c = scm_getc (port)) | |
522 | { | |
523 | case EOF: | |
524 | goto str_eof; | |
525 | case '"': | |
526 | case '\\': | |
527 | break; | |
9c44cd45 | 528 | case '\n': |
684d664e AW |
529 | if (SCM_HUNGRY_EOL_ESCAPES_P) |
530 | skip_intraline_whitespace (port); | |
9c44cd45 MG |
531 | continue; |
532 | case '0': | |
533 | c = '\0'; | |
534 | break; | |
535 | case 'f': | |
536 | c = '\f'; | |
537 | break; | |
538 | case 'n': | |
539 | c = '\n'; | |
540 | break; | |
541 | case 'r': | |
542 | c = '\r'; | |
543 | break; | |
544 | case 't': | |
545 | c = '\t'; | |
546 | break; | |
547 | case 'a': | |
548 | c = '\007'; | |
549 | break; | |
550 | case 'v': | |
551 | c = '\v'; | |
552 | break; | |
67a4a16d MG |
553 | case 'b': |
554 | c = '\010'; | |
555 | break; | |
9c44cd45 | 556 | case 'x': |
dea901d6 MG |
557 | if (SCM_R6RS_ESCAPES_P) |
558 | SCM_READ_HEX_ESCAPE (10, ';'); | |
559 | else | |
560 | SCM_READ_HEX_ESCAPE (2, '\0'); | |
c5661d28 | 561 | break; |
9c44cd45 | 562 | case 'u': |
898a0b5a MG |
563 | if (!SCM_R6RS_ESCAPES_P) |
564 | { | |
565 | SCM_READ_HEX_ESCAPE (4, '\0'); | |
566 | break; | |
567 | } | |
9c44cd45 | 568 | case 'U': |
898a0b5a MG |
569 | if (!SCM_R6RS_ESCAPES_P) |
570 | { | |
571 | SCM_READ_HEX_ESCAPE (6, '\0'); | |
572 | break; | |
573 | } | |
9c44cd45 MG |
574 | default: |
575 | bad_escaped: | |
576 | scm_i_input_error (FUNC_NAME, port, | |
577 | "illegal character in escape sequence: ~S", | |
578 | scm_list_1 (SCM_MAKE_CHAR (c))); | |
579 | } | |
580 | } | |
ff4d3672 LC |
581 | |
582 | c_str[c_str_len++] = c; | |
7337d56d | 583 | } |
ff4d3672 LC |
584 | |
585 | if (scm_is_null (str)) | |
586 | /* Fast path: we got a string that fits in C_STR. */ | |
587 | str = scm_from_utf32_stringn (c_str, c_str_len); | |
588 | else | |
589 | { | |
590 | if (c_str_len > 0) | |
591 | str = scm_cons (scm_from_utf32_stringn (c_str, c_str_len), str); | |
592 | ||
593 | str = scm_string_concatenate_reverse (str, SCM_UNDEFINED, SCM_UNDEFINED); | |
594 | } | |
595 | ||
596 | return maybe_annotate_source (str, port, line, column); | |
0f2d19dd | 597 | } |
db4b4ca6 DH |
598 | #undef FUNC_NAME |
599 | ||
0f2d19dd | 600 | |
7337d56d | 601 | static SCM |
889975e5 | 602 | scm_read_number (scm_t_wchar chr, SCM port) |
0f2d19dd | 603 | { |
69f90b0b | 604 | SCM result, str = SCM_EOL; |
b662b7e9 | 605 | char local_buffer[READER_BUFFER_SIZE], *buffer; |
69f90b0b | 606 | size_t bytes_read; |
69f90b0b | 607 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
0f2d19dd | 608 | |
38f19074 MW |
609 | /* Need to capture line and column numbers here. */ |
610 | long line = SCM_LINUM (port); | |
611 | int column = SCM_COL (port) - 1; | |
612 | ||
7337d56d | 613 | scm_ungetc (chr, port); |
b662b7e9 LC |
614 | buffer = read_complete_token (port, local_buffer, sizeof local_buffer, |
615 | &bytes_read); | |
69f90b0b | 616 | |
b662b7e9 | 617 | str = scm_from_stringn (buffer, bytes_read, pt->encoding, pt->ilseq_handler); |
69f90b0b MG |
618 | |
619 | result = scm_string_to_number (str, SCM_UNDEFINED); | |
38f19074 | 620 | if (scm_is_false (result)) |
69f90b0b MG |
621 | { |
622 | /* Return a symbol instead of a number */ | |
623 | if (SCM_CASE_INSENSITIVE_P) | |
624 | str = scm_string_downcase_x (str); | |
625 | result = scm_string_to_symbol (str); | |
626 | } | |
38f19074 MW |
627 | else if (SCM_NIMP (result)) |
628 | result = maybe_annotate_source (result, port, line, column); | |
0f2d19dd | 629 | |
69f90b0b | 630 | SCM_COL (port) += scm_i_string_length (str); |
7337d56d LC |
631 | return result; |
632 | } | |
0f2d19dd | 633 | |
7337d56d | 634 | static SCM |
889975e5 | 635 | scm_read_mixed_case_symbol (scm_t_wchar chr, SCM port) |
7337d56d | 636 | { |
889975e5 MG |
637 | SCM result; |
638 | int ends_with_colon = 0; | |
69f90b0b | 639 | size_t bytes_read; |
ef4cbc08 | 640 | int postfix = scm_is_eq (SCM_PACK (SCM_KEYWORD_STYLE), scm_keyword_postfix); |
b662b7e9 | 641 | char local_buffer[READER_BUFFER_SIZE], *buffer; |
69f90b0b MG |
642 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
643 | SCM str; | |
7337d56d LC |
644 | |
645 | scm_ungetc (chr, port); | |
b662b7e9 LC |
646 | buffer = read_complete_token (port, local_buffer, sizeof local_buffer, |
647 | &bytes_read); | |
69f90b0b | 648 | if (bytes_read > 0) |
b662b7e9 | 649 | ends_with_colon = buffer[bytes_read - 1] == ':'; |
ef4cbc08 | 650 | |
69f90b0b MG |
651 | if (postfix && ends_with_colon && (bytes_read > 1)) |
652 | { | |
b662b7e9 LC |
653 | str = scm_from_stringn (buffer, bytes_read - 1, |
654 | pt->encoding, pt->ilseq_handler); | |
69f90b0b MG |
655 | |
656 | if (SCM_CASE_INSENSITIVE_P) | |
657 | str = scm_string_downcase_x (str); | |
658 | result = scm_symbol_to_keyword (scm_string_to_symbol (str)); | |
659 | } | |
7337d56d | 660 | else |
69f90b0b | 661 | { |
b662b7e9 LC |
662 | str = scm_from_stringn (buffer, bytes_read, |
663 | pt->encoding, pt->ilseq_handler); | |
69f90b0b MG |
664 | |
665 | if (SCM_CASE_INSENSITIVE_P) | |
666 | str = scm_string_downcase_x (str); | |
667 | result = scm_string_to_symbol (str); | |
668 | } | |
7337d56d | 669 | |
69f90b0b | 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; |
b662b7e9 | 680 | char local_buffer[READER_BUFFER_SIZE], *buffer; |
7337d56d | 681 | unsigned int radix; |
69f90b0b MG |
682 | SCM str; |
683 | scm_t_port *pt; | |
7337d56d LC |
684 | |
685 | switch (chr) | |
686 | { | |
687 | case 'B': | |
688 | case 'b': | |
689 | radix = 2; | |
690 | break; | |
691 | ||
692 | case 'o': | |
693 | case 'O': | |
694 | radix = 8; | |
695 | break; | |
696 | ||
697 | case 'd': | |
698 | case 'D': | |
699 | radix = 10; | |
700 | break; | |
701 | ||
702 | case 'x': | |
703 | case 'X': | |
704 | radix = 16; | |
705 | break; | |
706 | ||
707 | default: | |
708 | scm_ungetc (chr, port); | |
709 | scm_ungetc ('#', port); | |
710 | radix = 10; | |
711 | } | |
712 | ||
b662b7e9 LC |
713 | buffer = read_complete_token (port, local_buffer, sizeof local_buffer, |
714 | &read); | |
69f90b0b MG |
715 | |
716 | pt = SCM_PTAB_ENTRY (port); | |
b662b7e9 | 717 | str = scm_from_stringn (buffer, read, pt->encoding, pt->ilseq_handler); |
69f90b0b MG |
718 | |
719 | result = scm_string_to_number (str, scm_from_uint (radix)); | |
720 | ||
69f90b0b | 721 | SCM_COL (port) += scm_i_string_length (str); |
7337d56d LC |
722 | |
723 | if (scm_is_true (result)) | |
724 | return result; | |
725 | ||
726 | scm_i_input_error (FUNC_NAME, port, "unknown # object", SCM_EOL); | |
727 | ||
728 | return SCM_BOOL_F; | |
729 | } | |
730 | #undef FUNC_NAME | |
731 | ||
732 | static SCM | |
733 | scm_read_quote (int chr, SCM port) | |
734 | { | |
735 | SCM p; | |
492faee1 LC |
736 | long line = SCM_LINUM (port); |
737 | int column = SCM_COL (port) - 1; | |
7337d56d LC |
738 | |
739 | switch (chr) | |
740 | { | |
741 | case '`': | |
742 | p = scm_sym_quasiquote; | |
743 | break; | |
744 | ||
745 | case '\'': | |
746 | p = scm_sym_quote; | |
747 | break; | |
748 | ||
749 | case ',': | |
750 | { | |
889975e5 | 751 | scm_t_wchar c; |
7337d56d LC |
752 | |
753 | c = scm_getc (port); | |
754 | if ('@' == c) | |
755 | p = scm_sym_uq_splicing; | |
756 | else | |
0f2d19dd | 757 | { |
7337d56d LC |
758 | scm_ungetc (c, port); |
759 | p = scm_sym_unquote; | |
0f2d19dd | 760 | } |
7337d56d LC |
761 | break; |
762 | } | |
0f2d19dd | 763 | |
7337d56d LC |
764 | default: |
765 | fprintf (stderr, "%s: unhandled quote character (%i)\n", | |
7f74cf9a | 766 | "scm_read_quote", chr); |
7337d56d | 767 | abort (); |
0f2d19dd | 768 | } |
1cc91f1b | 769 | |
7337d56d | 770 | p = scm_cons2 (p, scm_read_expression (port), SCM_EOL); |
d6cb0203 | 771 | return maybe_annotate_source (p, port, line, column); |
7337d56d LC |
772 | } |
773 | ||
34f3d47d AW |
774 | SCM_SYMBOL (sym_syntax, "syntax"); |
775 | SCM_SYMBOL (sym_quasisyntax, "quasisyntax"); | |
776 | SCM_SYMBOL (sym_unsyntax, "unsyntax"); | |
777 | SCM_SYMBOL (sym_unsyntax_splicing, "unsyntax-splicing"); | |
778 | ||
779 | static SCM | |
780 | scm_read_syntax (int chr, SCM port) | |
781 | { | |
782 | SCM p; | |
783 | long line = SCM_LINUM (port); | |
784 | int column = SCM_COL (port) - 1; | |
785 | ||
786 | switch (chr) | |
787 | { | |
788 | case '`': | |
789 | p = sym_quasisyntax; | |
790 | break; | |
791 | ||
792 | case '\'': | |
793 | p = sym_syntax; | |
794 | break; | |
795 | ||
796 | case ',': | |
797 | { | |
798 | int c; | |
799 | ||
800 | c = scm_getc (port); | |
801 | if ('@' == c) | |
802 | p = sym_unsyntax_splicing; | |
803 | else | |
804 | { | |
805 | scm_ungetc (c, port); | |
806 | p = sym_unsyntax; | |
807 | } | |
808 | break; | |
809 | } | |
810 | ||
811 | default: | |
812 | fprintf (stderr, "%s: unhandled syntax character (%i)\n", | |
813 | "scm_read_syntax", chr); | |
814 | abort (); | |
815 | } | |
816 | ||
817 | p = scm_cons2 (p, scm_read_expression (port), SCM_EOL); | |
d6cb0203 | 818 | return maybe_annotate_source (p, port, line, column); |
34f3d47d AW |
819 | } |
820 | ||
cfd15439 | 821 | static SCM |
7c4aad9c AW |
822 | scm_read_nil (int chr, SCM port) |
823 | { | |
824 | SCM id = scm_read_mixed_case_symbol (chr, port); | |
825 | ||
826 | if (!scm_is_eq (id, sym_nil)) | |
827 | scm_i_input_error ("scm_read_nil", port, | |
828 | "unexpected input while reading #nil: ~a", | |
829 | scm_list_1 (id)); | |
830 | ||
831 | return SCM_ELISP_NIL; | |
832 | } | |
833 | ||
cfd15439 | 834 | static SCM |
7337d56d | 835 | scm_read_semicolon_comment (int chr, SCM port) |
0f2d19dd | 836 | { |
0f2d19dd JB |
837 | int c; |
838 | ||
889975e5 MG |
839 | /* We use the get_byte here because there is no need to get the |
840 | locale correct with comment input. This presumes that newline | |
841 | always represents itself no matter what the encoding is. */ | |
842 | for (c = scm_get_byte_or_eof (port); | |
7337d56d | 843 | (c != EOF) && (c != '\n'); |
8a8da78d | 844 | c = scm_get_byte_or_eof (port)); |
7337d56d LC |
845 | |
846 | return SCM_UNSPECIFIED; | |
847 | } | |
848 | ||
849 | \f | |
850 | /* Sharp readers, i.e. readers called after a `#' sign has been read. */ | |
851 | ||
852 | static SCM | |
853 | scm_read_boolean (int chr, SCM port) | |
854 | { | |
855 | switch (chr) | |
0f2d19dd | 856 | { |
7337d56d LC |
857 | case 't': |
858 | case 'T': | |
859 | return SCM_BOOL_T; | |
860 | ||
861 | case 'f': | |
862 | case 'F': | |
863 | return SCM_BOOL_F; | |
0f2d19dd | 864 | } |
7337d56d LC |
865 | |
866 | return SCM_UNSPECIFIED; | |
867 | } | |
868 | ||
869 | static SCM | |
889975e5 | 870 | scm_read_character (scm_t_wchar chr, SCM port) |
7337d56d LC |
871 | #define FUNC_NAME "scm_lreadr" |
872 | { | |
69f90b0b MG |
873 | char buffer[READER_CHAR_NAME_MAX_SIZE]; |
874 | SCM charname; | |
875 | size_t charname_len, bytes_read; | |
889975e5 MG |
876 | scm_t_wchar cp; |
877 | int overflow; | |
69f90b0b | 878 | scm_t_port *pt; |
889975e5 | 879 | |
69f90b0b | 880 | overflow = read_token (port, buffer, READER_CHAR_NAME_MAX_SIZE, &bytes_read); |
889975e5 | 881 | if (overflow) |
c1a0ba1c | 882 | scm_i_input_error (FUNC_NAME, port, "character name too long", SCM_EOL); |
7337d56d | 883 | |
69f90b0b | 884 | if (bytes_read == 0) |
0f2d19dd | 885 | { |
7337d56d LC |
886 | chr = scm_getc (port); |
887 | if (chr == EOF) | |
888 | scm_i_input_error (FUNC_NAME, port, "unexpected end of file " | |
889 | "while reading character", SCM_EOL); | |
890 | ||
891 | /* CHR must be a token delimiter, like a whitespace. */ | |
892 | return (SCM_MAKE_CHAR (chr)); | |
0f2d19dd | 893 | } |
7337d56d | 894 | |
69f90b0b | 895 | pt = SCM_PTAB_ENTRY (port); |
7337d56d | 896 | |
69f90b0b MG |
897 | /* Simple ASCII characters can be processed immediately. Also, simple |
898 | ISO-8859-1 characters can be processed immediately if the encoding for this | |
899 | port is ISO-8859-1. */ | |
900 | if (bytes_read == 1 && ((unsigned char) buffer[0] <= 127 || pt->encoding == NULL)) | |
901 | { | |
902 | SCM_COL (port) += 1; | |
903 | return SCM_MAKE_CHAR (buffer[0]); | |
904 | } | |
905 | ||
906 | /* Otherwise, convert the buffer into a proper scheme string for | |
907 | processing. */ | |
908 | charname = scm_from_stringn (buffer, bytes_read, pt->encoding, | |
909 | pt->ilseq_handler); | |
910 | charname_len = scm_i_string_length (charname); | |
911 | SCM_COL (port) += charname_len; | |
889975e5 | 912 | cp = scm_i_string_ref (charname, 0); |
69f90b0b MG |
913 | if (charname_len == 1) |
914 | return SCM_MAKE_CHAR (cp); | |
915 | ||
916 | /* Ignore dotted circles, which may be used to keep combining characters from | |
917 | combining with the backslash in #\charname. */ | |
0dcd7e61 MG |
918 | if (cp == SCM_CODEPOINT_DOTTED_CIRCLE && charname_len == 2) |
919 | return SCM_MAKE_CHAR (scm_i_string_ref (charname, 1)); | |
920 | ||
889975e5 | 921 | if (cp >= '0' && cp < '8') |
7337d56d LC |
922 | { |
923 | /* Dirk:FIXME:: This type of character syntax is not R5RS | |
924 | * compliant. Further, it should be verified that the constant | |
0ffc78e3 | 925 | * does only consist of octal digits. */ |
889975e5 | 926 | SCM p = scm_string_to_number (charname, scm_from_uint (8)); |
7337d56d | 927 | if (SCM_I_INUMP (p)) |
0ffc78e3 | 928 | { |
e25f3727 | 929 | scm_t_wchar c = scm_to_uint32 (p); |
0ffc78e3 MG |
930 | if (SCM_IS_UNICODE_CHAR (c)) |
931 | return SCM_MAKE_CHAR (c); | |
932 | else | |
0f3a70cf | 933 | scm_i_input_error (FUNC_NAME, port, |
0ffc78e3 MG |
934 | "out-of-range octal character escape: ~a", |
935 | scm_list_1 (charname)); | |
936 | } | |
7337d56d LC |
937 | } |
938 | ||
0f3a70cf | 939 | if (cp == 'x' && (charname_len > 1)) |
dea901d6 MG |
940 | { |
941 | SCM p; | |
0f3a70cf | 942 | |
dea901d6 MG |
943 | /* Convert from hex, skipping the initial 'x' character in CHARNAME */ |
944 | p = scm_string_to_number (scm_c_substring (charname, 1, charname_len), | |
945 | scm_from_uint (16)); | |
946 | if (SCM_I_INUMP (p)) | |
947 | { | |
e25f3727 | 948 | scm_t_wchar c = scm_to_uint32 (p); |
dea901d6 MG |
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 hex character escape: ~a", | |
954 | scm_list_1 (charname)); | |
955 | } | |
956 | } | |
957 | ||
889975e5 MG |
958 | /* The names of characters should never have non-Latin1 |
959 | characters. */ | |
960 | if (scm_i_is_narrow_string (charname) | |
961 | || scm_i_try_narrow_string (charname)) | |
4769c9db AW |
962 | { SCM ch = scm_i_charname_to_char (scm_i_string_chars (charname), |
963 | charname_len); | |
964 | if (scm_is_true (ch)) | |
965 | return ch; | |
966 | } | |
7337d56d | 967 | |
7337d56d | 968 | scm_i_input_error (FUNC_NAME, port, "unknown character name ~a", |
889975e5 | 969 | scm_list_1 (charname)); |
7337d56d LC |
970 | |
971 | return SCM_UNSPECIFIED; | |
0f2d19dd | 972 | } |
db4b4ca6 | 973 | #undef FUNC_NAME |
0f2d19dd | 974 | |
cfd15439 | 975 | static SCM |
7337d56d LC |
976 | scm_read_keyword (int chr, SCM port) |
977 | { | |
978 | SCM symbol; | |
979 | ||
980 | /* Read the symbol that comprises the keyword. Doing this instead of | |
981 | invoking a specific symbol reader function allows `scm_read_keyword ()' | |
982 | to adapt to the delimiters currently valid of symbols. | |
1cc91f1b | 983 | |
7337d56d LC |
984 | XXX: This implementation allows sloppy syntaxes like `#: key'. */ |
985 | symbol = scm_read_expression (port); | |
986 | if (!scm_is_symbol (symbol)) | |
7f74cf9a | 987 | scm_i_input_error ("scm_read_keyword", port, |
7337d56d LC |
988 | "keyword prefix `~a' not followed by a symbol: ~s", |
989 | scm_list_2 (SCM_MAKE_CHAR (chr), symbol)); | |
990 | ||
991 | return (scm_symbol_to_keyword (symbol)); | |
992 | } | |
993 | ||
cfd15439 | 994 | static SCM |
b131b233 | 995 | scm_read_vector (int chr, SCM port, long line, int column) |
09a4f039 | 996 | { |
7337d56d LC |
997 | /* Note: We call `scm_read_sexp ()' rather than READER here in order to |
998 | guarantee that it's going to do what we want. After all, this is an | |
999 | implementation detail of `scm_read_vector ()', not a desirable | |
1000 | property. */ | |
b131b233 MW |
1001 | return maybe_annotate_source (scm_vector (scm_read_sexp (chr, port)), |
1002 | port, line, column); | |
1003 | } | |
1004 | ||
1005 | static SCM | |
1006 | scm_read_array (int chr, SCM port, long line, int column) | |
1007 | { | |
1008 | SCM result = scm_i_read_array (port, chr); | |
1009 | if (scm_is_false (result)) | |
1010 | return result; | |
1011 | else | |
1012 | return maybe_annotate_source (result, port, line, column); | |
7337d56d | 1013 | } |
09a4f039 | 1014 | |
cfd15439 | 1015 | static SCM |
b131b233 | 1016 | scm_read_srfi4_vector (int chr, SCM port, long line, int column) |
7337d56d | 1017 | { |
b131b233 | 1018 | return scm_read_array (chr, port, line, column); |
7337d56d LC |
1019 | } |
1020 | ||
0ba0b384 | 1021 | static SCM |
b131b233 | 1022 | scm_read_bytevector (scm_t_wchar chr, SCM port, long line, int column) |
0ba0b384 LC |
1023 | { |
1024 | chr = scm_getc (port); | |
1025 | if (chr != 'u') | |
1026 | goto syntax; | |
1027 | ||
1028 | chr = scm_getc (port); | |
1029 | if (chr != '8') | |
1030 | goto syntax; | |
1031 | ||
1032 | chr = scm_getc (port); | |
1033 | if (chr != '(') | |
1034 | goto syntax; | |
1035 | ||
b131b233 MW |
1036 | return maybe_annotate_source |
1037 | (scm_u8_list_to_bytevector (scm_read_sexp (chr, port)), | |
1038 | port, line, column); | |
0ba0b384 LC |
1039 | |
1040 | syntax: | |
1041 | scm_i_input_error ("read_bytevector", port, | |
1042 | "invalid bytevector prefix", | |
1043 | SCM_MAKE_CHAR (chr)); | |
1044 | return SCM_UNSPECIFIED; | |
1045 | } | |
1046 | ||
7337d56d | 1047 | static SCM |
b131b233 | 1048 | scm_read_guile_bit_vector (scm_t_wchar chr, SCM port, long line, int column) |
7337d56d LC |
1049 | { |
1050 | /* Read the `#*10101'-style read syntax for bit vectors in Guile. This is | |
1051 | terribly inefficient but who cares? */ | |
1052 | SCM s_bits = SCM_EOL; | |
1053 | ||
1054 | for (chr = scm_getc (port); | |
1055 | (chr != EOF) && ((chr == '0') || (chr == '1')); | |
1056 | chr = scm_getc (port)) | |
09a4f039 | 1057 | { |
7337d56d | 1058 | s_bits = scm_cons ((chr == '0') ? SCM_BOOL_F : SCM_BOOL_T, s_bits); |
09a4f039 | 1059 | } |
7337d56d LC |
1060 | |
1061 | if (chr != EOF) | |
1062 | scm_ungetc (chr, port); | |
1063 | ||
b131b233 MW |
1064 | return maybe_annotate_source |
1065 | (scm_bitvector (scm_reverse_x (s_bits, SCM_EOL)), | |
1066 | port, line, column); | |
7337d56d LC |
1067 | } |
1068 | ||
cfd15439 | 1069 | static SCM |
889975e5 | 1070 | scm_read_scsh_block_comment (scm_t_wchar chr, SCM port) |
7337d56d LC |
1071 | { |
1072 | int bang_seen = 0; | |
1073 | ||
1074 | for (;;) | |
09a4f039 | 1075 | { |
58b1db5f | 1076 | int c = scm_getc (port); |
62850ef3 | 1077 | |
7337d56d LC |
1078 | if (c == EOF) |
1079 | scm_i_input_error ("skip_block_comment", port, | |
1080 | "unterminated `#! ... !#' comment", SCM_EOL); | |
1081 | ||
1082 | if (c == '!') | |
1083 | bang_seen = 1; | |
1084 | else if (c == '#' && bang_seen) | |
1085 | break; | |
1086 | else | |
1087 | bang_seen = 0; | |
1088 | } | |
1089 | ||
1090 | return SCM_UNSPECIFIED; | |
1091 | } | |
1092 | ||
d7fcaec3 | 1093 | static SCM |
911b03b2 JG |
1094 | scm_read_shebang (scm_t_wchar chr, SCM port) |
1095 | { | |
1096 | int c = 0; | |
1097 | if ((c = scm_get_byte_or_eof (port)) != 'r') | |
1098 | { | |
1099 | scm_ungetc (c, port); | |
1100 | return scm_read_scsh_block_comment (chr, port); | |
1101 | } | |
1102 | if ((c = scm_get_byte_or_eof (port)) != '6') | |
1103 | { | |
1104 | scm_ungetc (c, port); | |
1105 | scm_ungetc ('r', port); | |
1106 | return scm_read_scsh_block_comment (chr, port); | |
1107 | } | |
1108 | if ((c = scm_get_byte_or_eof (port)) != 'r') | |
1109 | { | |
1110 | scm_ungetc (c, port); | |
1111 | scm_ungetc ('6', port); | |
1112 | scm_ungetc ('r', port); | |
1113 | return scm_read_scsh_block_comment (chr, port); | |
1114 | } | |
1115 | if ((c = scm_get_byte_or_eof (port)) != 's') | |
1116 | { | |
1117 | scm_ungetc (c, port); | |
1118 | scm_ungetc ('r', port); | |
1119 | scm_ungetc ('6', port); | |
1120 | scm_ungetc ('r', port); | |
1121 | return scm_read_scsh_block_comment (chr, port); | |
1122 | } | |
1123 | ||
1124 | return SCM_UNSPECIFIED; | |
1125 | } | |
1126 | ||
620c8965 LC |
1127 | static SCM |
1128 | scm_read_r6rs_block_comment (scm_t_wchar chr, SCM port) | |
1129 | { | |
1130 | /* Unlike SCSH-style block comments, SRFI-30/R6RS block comments may be | |
1131 | nested. So care must be taken. */ | |
1132 | int nesting_level = 1; | |
6d5f8c32 AW |
1133 | |
1134 | int a = scm_getc (port); | |
1135 | ||
1136 | if (a == EOF) | |
1137 | scm_i_input_error ("scm_read_r6rs_block_comment", port, | |
1138 | "unterminated `#| ... |#' comment", SCM_EOL); | |
620c8965 LC |
1139 | |
1140 | while (nesting_level > 0) | |
1141 | { | |
6d5f8c32 | 1142 | int b = scm_getc (port); |
620c8965 | 1143 | |
6d5f8c32 | 1144 | if (b == EOF) |
cd169c5a | 1145 | scm_i_input_error ("scm_read_r6rs_block_comment", port, |
620c8965 LC |
1146 | "unterminated `#| ... |#' comment", SCM_EOL); |
1147 | ||
6d5f8c32 AW |
1148 | if (a == '|' && b == '#') |
1149 | { | |
1150 | nesting_level--; | |
1151 | b = EOF; | |
1152 | } | |
1153 | else if (a == '#' && b == '|') | |
1154 | { | |
1155 | nesting_level++; | |
1156 | b = EOF; | |
1157 | } | |
1158 | ||
1159 | a = b; | |
620c8965 LC |
1160 | } |
1161 | ||
1162 | return SCM_UNSPECIFIED; | |
1163 | } | |
1164 | ||
34f3d47d | 1165 | static SCM |
889975e5 | 1166 | scm_read_commented_expression (scm_t_wchar chr, SCM port) |
34f3d47d | 1167 | { |
889975e5 | 1168 | scm_t_wchar c; |
34f3d47d AW |
1169 | |
1170 | c = flush_ws (port, (char *) NULL); | |
1171 | if (EOF == c) | |
1172 | scm_i_input_error ("read_commented_expression", port, | |
1173 | "no expression after #; comment", SCM_EOL); | |
1174 | scm_ungetc (c, port); | |
1175 | scm_read_expression (port); | |
1176 | return SCM_UNSPECIFIED; | |
1177 | } | |
1178 | ||
7337d56d | 1179 | static SCM |
889975e5 | 1180 | scm_read_extended_symbol (scm_t_wchar chr, SCM port) |
7337d56d LC |
1181 | { |
1182 | /* Guile's extended symbol read syntax looks like this: | |
1183 | ||
1184 | #{This is all a symbol name}# | |
1185 | ||
1186 | So here, CHR is expected to be `{'. */ | |
d9527cfa | 1187 | int saw_brace = 0; |
7337d56d | 1188 | size_t len = 0; |
190d4b0d | 1189 | SCM buf = scm_i_make_string (1024, NULL, 0); |
7337d56d | 1190 | |
889975e5 | 1191 | buf = scm_i_string_start_writing (buf); |
7337d56d LC |
1192 | |
1193 | while ((chr = scm_getc (port)) != EOF) | |
1194 | { | |
1195 | if (saw_brace) | |
09a4f039 | 1196 | { |
7337d56d LC |
1197 | if (chr == '#') |
1198 | { | |
7337d56d LC |
1199 | break; |
1200 | } | |
1201 | else | |
1202 | { | |
1203 | saw_brace = 0; | |
889975e5 | 1204 | scm_i_string_set_x (buf, len++, '}'); |
7337d56d | 1205 | } |
09a4f039 | 1206 | } |
d9527cfa AW |
1207 | |
1208 | if (chr == '}') | |
7337d56d | 1209 | saw_brace = 1; |
d9527cfa AW |
1210 | else if (chr == '\\') |
1211 | { | |
1212 | /* It used to be that print.c would print extended-read-syntax | |
1213 | symbols with backslashes before "non-standard" chars, but | |
1214 | this routine wouldn't do anything with those escapes. | |
1215 | Bummer. What we've done is to change print.c to output | |
1216 | R6RS hex escapes for those characters, relying on the fact | |
1217 | that the extended read syntax would never put a `\' before | |
1218 | an `x'. For now, we just ignore other instances of | |
1219 | backslash in the string. */ | |
1220 | switch ((chr = scm_getc (port))) | |
1221 | { | |
1222 | case EOF: | |
1223 | goto done; | |
1224 | case 'x': | |
1225 | { | |
1226 | scm_t_wchar c; | |
1227 | ||
1228 | SCM_READ_HEX_ESCAPE (10, ';'); | |
1229 | scm_i_string_set_x (buf, len++, c); | |
1230 | break; | |
1231 | ||
1232 | str_eof: | |
1233 | chr = EOF; | |
1234 | goto done; | |
1235 | ||
1236 | bad_escaped: | |
1237 | scm_i_string_stop_writing (); | |
1238 | scm_i_input_error ("scm_read_extended_symbol", port, | |
1239 | "illegal character in escape sequence: ~S", | |
1240 | scm_list_1 (SCM_MAKE_CHAR (c))); | |
1241 | break; | |
1242 | } | |
1243 | default: | |
1244 | scm_i_string_set_x (buf, len++, chr); | |
1245 | break; | |
1246 | } | |
1247 | } | |
7337d56d | 1248 | else |
d9527cfa | 1249 | scm_i_string_set_x (buf, len++, chr); |
62850ef3 | 1250 | |
889975e5 | 1251 | if (len >= scm_i_string_length (buf) - 2) |
7337d56d | 1252 | { |
7f991c7d LC |
1253 | SCM addy; |
1254 | ||
889975e5 | 1255 | scm_i_string_stop_writing (); |
190d4b0d | 1256 | addy = scm_i_make_string (1024, NULL, 0); |
889975e5 | 1257 | buf = scm_string_append (scm_list_2 (buf, addy)); |
7337d56d | 1258 | len = 0; |
889975e5 | 1259 | buf = scm_i_string_start_writing (buf); |
7337d56d | 1260 | } |
7337d56d | 1261 | } |
d9527cfa AW |
1262 | |
1263 | done: | |
889975e5 | 1264 | scm_i_string_stop_writing (); |
d9527cfa AW |
1265 | if (chr == EOF) |
1266 | scm_i_input_error ("scm_read_extended_symbol", port, | |
1267 | "end of file while reading symbol", SCM_EOL); | |
7337d56d | 1268 | |
889975e5 | 1269 | return (scm_string_to_symbol (scm_c_substring (buf, 0, len))); |
7337d56d LC |
1270 | } |
1271 | ||
1272 | ||
1273 | \f | |
1274 | /* Top-level token readers, i.e., dispatchers. */ | |
1275 | ||
1276 | static SCM | |
1277 | scm_read_sharp_extension (int chr, SCM port) | |
1278 | { | |
1279 | SCM proc; | |
1280 | ||
1281 | proc = scm_get_hash_procedure (chr); | |
1282 | if (scm_is_true (scm_procedure_p (proc))) | |
1283 | { | |
1284 | long line = SCM_LINUM (port); | |
1285 | int column = SCM_COL (port) - 2; | |
1286 | SCM got; | |
1287 | ||
1288 | got = scm_call_2 (proc, SCM_MAKE_CHAR (chr), port); | |
26c8cc14 AW |
1289 | |
1290 | if (scm_is_pair (got) && !scm_i_has_source_properties (got)) | |
1291 | scm_i_set_source_properties_x (got, line, column, SCM_FILENAME (port)); | |
1292 | ||
1293 | return got; | |
09a4f039 | 1294 | } |
7337d56d LC |
1295 | |
1296 | return SCM_UNSPECIFIED; | |
1297 | } | |
1298 | ||
1299 | /* The reader for the sharp `#' character. It basically dispatches reads | |
1300 | among the above token readers. */ | |
1301 | static SCM | |
b131b233 | 1302 | scm_read_sharp (scm_t_wchar chr, SCM port, long line, int column) |
7337d56d LC |
1303 | #define FUNC_NAME "scm_lreadr" |
1304 | { | |
1305 | SCM result; | |
1306 | ||
1307 | chr = scm_getc (port); | |
1308 | ||
1309 | result = scm_read_sharp_extension (chr, port); | |
1310 | if (!scm_is_eq (result, SCM_UNSPECIFIED)) | |
1311 | return result; | |
1312 | ||
1313 | switch (chr) | |
1314 | { | |
1315 | case '\\': | |
1316 | return (scm_read_character (chr, port)); | |
1317 | case '(': | |
b131b233 | 1318 | return (scm_read_vector (chr, port, line, column)); |
7337d56d LC |
1319 | case 's': |
1320 | case 'u': | |
1321 | case 'f': | |
df941b5b | 1322 | case 'c': |
7337d56d | 1323 | /* This one may return either a boolean or an SRFI-4 vector. */ |
b131b233 | 1324 | return (scm_read_srfi4_vector (chr, port, line, column)); |
0ba0b384 | 1325 | case 'v': |
b131b233 | 1326 | return (scm_read_bytevector (chr, port, line, column)); |
7337d56d | 1327 | case '*': |
b131b233 | 1328 | return (scm_read_guile_bit_vector (chr, port, line, column)); |
7337d56d LC |
1329 | case 't': |
1330 | case 'T': | |
1331 | case 'F': | |
7337d56d LC |
1332 | return (scm_read_boolean (chr, port)); |
1333 | case ':': | |
1334 | return (scm_read_keyword (chr, port)); | |
1335 | case '0': case '1': case '2': case '3': case '4': | |
1336 | case '5': case '6': case '7': case '8': case '9': | |
1337 | case '@': | |
1338 | #if SCM_ENABLE_DEPRECATED | |
1339 | /* See below for 'i' and 'e'. */ | |
1340 | case 'a': | |
7337d56d LC |
1341 | case 'y': |
1342 | case 'h': | |
1343 | case 'l': | |
1344 | #endif | |
b131b233 | 1345 | return (scm_read_array (chr, port, line, column)); |
7337d56d LC |
1346 | |
1347 | case 'i': | |
1348 | case 'e': | |
1349 | #if SCM_ENABLE_DEPRECATED | |
1350 | { | |
1351 | /* When next char is '(', it really is an old-style | |
1352 | uniform array. */ | |
889975e5 | 1353 | scm_t_wchar next_c = scm_getc (port); |
7337d56d LC |
1354 | if (next_c != EOF) |
1355 | scm_ungetc (next_c, port); | |
1356 | if (next_c == '(') | |
b131b233 | 1357 | return scm_read_array (chr, port, line, column); |
7337d56d LC |
1358 | /* Fall through. */ |
1359 | } | |
1360 | #endif | |
1361 | case 'b': | |
1362 | case 'B': | |
1363 | case 'o': | |
1364 | case 'O': | |
1365 | case 'd': | |
1366 | case 'D': | |
1367 | case 'x': | |
1368 | case 'X': | |
1369 | case 'I': | |
1370 | case 'E': | |
1371 | return (scm_read_number_and_radix (chr, port)); | |
1372 | case '{': | |
1373 | return (scm_read_extended_symbol (chr, port)); | |
1374 | case '!': | |
911b03b2 | 1375 | return (scm_read_shebang (chr, port)); |
34f3d47d AW |
1376 | case ';': |
1377 | return (scm_read_commented_expression (chr, port)); | |
1378 | case '`': | |
1379 | case '\'': | |
1380 | case ',': | |
1381 | return (scm_read_syntax (chr, port)); | |
7c4aad9c AW |
1382 | case 'n': |
1383 | return (scm_read_nil (chr, port)); | |
7337d56d LC |
1384 | default: |
1385 | result = scm_read_sharp_extension (chr, port); | |
1386 | if (scm_is_eq (result, SCM_UNSPECIFIED)) | |
620c8965 LC |
1387 | { |
1388 | /* To remain compatible with 1.8 and earlier, the following | |
1389 | characters have lower precedence than `read-hash-extend' | |
1390 | characters. */ | |
1391 | switch (chr) | |
1392 | { | |
1393 | case '|': | |
1394 | return scm_read_r6rs_block_comment (chr, port); | |
1395 | default: | |
1396 | scm_i_input_error (FUNC_NAME, port, "Unknown # object: ~S", | |
1397 | scm_list_1 (SCM_MAKE_CHAR (chr))); | |
1398 | } | |
1399 | } | |
7337d56d LC |
1400 | else |
1401 | return result; | |
1402 | } | |
1403 | ||
1404 | return SCM_UNSPECIFIED; | |
1405 | } | |
1406 | #undef FUNC_NAME | |
1407 | ||
1408 | static SCM | |
1409 | scm_read_expression (SCM port) | |
1410 | #define FUNC_NAME "scm_read_expression" | |
1411 | { | |
1412 | while (1) | |
1413 | { | |
cfd15439 | 1414 | scm_t_wchar chr; |
7337d56d LC |
1415 | |
1416 | chr = scm_getc (port); | |
1417 | ||
1418 | switch (chr) | |
1419 | { | |
1420 | case SCM_WHITE_SPACES: | |
1421 | case SCM_LINE_INCREMENTORS: | |
1422 | break; | |
1423 | case ';': | |
1424 | (void) scm_read_semicolon_comment (chr, port); | |
1425 | break; | |
5afa815c AW |
1426 | case '[': |
1427 | if (!SCM_SQUARE_BRACKETS_P) | |
1428 | return (scm_read_mixed_case_symbol (chr, port)); | |
1429 | /* otherwise fall through */ | |
7337d56d LC |
1430 | case '(': |
1431 | return (scm_read_sexp (chr, port)); | |
1432 | case '"': | |
1433 | return (scm_read_string (chr, port)); | |
1434 | case '\'': | |
1435 | case '`': | |
1436 | case ',': | |
1437 | return (scm_read_quote (chr, port)); | |
1438 | case '#': | |
1439 | { | |
b131b233 MW |
1440 | long line = SCM_LINUM (port); |
1441 | int column = SCM_COL (port) - 1; | |
1442 | SCM result = scm_read_sharp (chr, port, line, column); | |
7337d56d LC |
1443 | if (scm_is_eq (result, SCM_UNSPECIFIED)) |
1444 | /* We read a comment or some such. */ | |
1445 | break; | |
1446 | else | |
1447 | return result; | |
1448 | } | |
1449 | case ')': | |
1450 | scm_i_input_error (FUNC_NAME, port, "unexpected \")\"", SCM_EOL); | |
1451 | break; | |
a4e47229 MG |
1452 | case ']': |
1453 | if (SCM_SQUARE_BRACKETS_P) | |
1454 | scm_i_input_error (FUNC_NAME, port, "unexpected \"]\"", SCM_EOL); | |
1455 | /* otherwise fall through */ | |
7337d56d LC |
1456 | case EOF: |
1457 | return SCM_EOF_VAL; | |
1458 | case ':': | |
1459 | if (scm_is_eq (SCM_PACK (SCM_KEYWORD_STYLE), scm_keyword_prefix)) | |
1460 | return scm_symbol_to_keyword (scm_read_expression (port)); | |
1461 | /* Fall through. */ | |
1462 | ||
1463 | default: | |
1464 | { | |
1465 | if (((chr >= '0') && (chr <= '9')) | |
1466 | || (strchr ("+-.", chr))) | |
1467 | return (scm_read_number (chr, port)); | |
1468 | else | |
1469 | return (scm_read_mixed_case_symbol (chr, port)); | |
1470 | } | |
1471 | } | |
1472 | } | |
1473 | } | |
1474 | #undef FUNC_NAME | |
1475 | ||
1476 | \f | |
1477 | /* Actual reader. */ | |
1478 | ||
1479 | SCM_DEFINE (scm_read, "read", 0, 1, 0, | |
1480 | (SCM port), | |
1481 | "Read an s-expression from the input port @var{port}, or from\n" | |
1482 | "the current input port if @var{port} is not specified.\n" | |
1483 | "Any whitespace before the next token is discarded.") | |
1484 | #define FUNC_NAME s_scm_read | |
1485 | { | |
1486 | int c; | |
1487 | ||
1488 | if (SCM_UNBNDP (port)) | |
1489 | port = scm_current_input_port (); | |
1490 | SCM_VALIDATE_OPINPORT (1, port); | |
1491 | ||
1492 | c = flush_ws (port, (char *) NULL); | |
1493 | if (EOF == c) | |
1494 | return SCM_EOF_VAL; | |
1495 | scm_ungetc (c, port); | |
1496 | ||
1497 | return (scm_read_expression (port)); | |
09a4f039 | 1498 | } |
db4b4ca6 | 1499 | #undef FUNC_NAME |
09a4f039 | 1500 | |
0f2d19dd JB |
1501 | |
1502 | \f | |
1503 | ||
14de3b42 GH |
1504 | /* Manipulate the read-hash-procedures alist. This could be written in |
1505 | Scheme, but maybe it will also be used by C code during initialisation. */ | |
a1ec6916 | 1506 | SCM_DEFINE (scm_read_hash_extend, "read-hash-extend", 2, 0, 0, |
1bbd0b84 | 1507 | (SCM chr, SCM proc), |
dc7fa443 MG |
1508 | "Install the procedure @var{proc} for reading expressions\n" |
1509 | "starting with the character sequence @code{#} and @var{chr}.\n" | |
1510 | "@var{proc} will be called with two arguments: the character\n" | |
1511 | "@var{chr} and the port to read further data from. The object\n" | |
391f57e6 HWN |
1512 | "returned will be the return value of @code{read}. \n" |
1513 | "Passing @code{#f} for @var{proc} will remove a previous setting. \n" | |
1514 | ) | |
1bbd0b84 | 1515 | #define FUNC_NAME s_scm_read_hash_extend |
deca31e1 | 1516 | { |
fed9c9a2 GH |
1517 | SCM this; |
1518 | SCM prev; | |
1519 | ||
36284627 | 1520 | SCM_VALIDATE_CHAR (1, chr); |
7888309b | 1521 | SCM_ASSERT (scm_is_false (proc) |
bc36d050 | 1522 | || scm_is_eq (scm_procedure_p (proc), SCM_BOOL_T), |
36284627 | 1523 | proc, SCM_ARG2, FUNC_NAME); |
fed9c9a2 | 1524 | |
14de3b42 | 1525 | /* Check if chr is already in the alist. */ |
d458073b | 1526 | this = scm_i_read_hash_procedures_ref (); |
14de3b42 | 1527 | prev = SCM_BOOL_F; |
fed9c9a2 GH |
1528 | while (1) |
1529 | { | |
d2e53ed6 | 1530 | if (scm_is_null (this)) |
fed9c9a2 GH |
1531 | { |
1532 | /* not found, so add it to the beginning. */ | |
7888309b | 1533 | if (scm_is_true (proc)) |
fed9c9a2 | 1534 | { |
d458073b AR |
1535 | SCM new = scm_cons (scm_cons (chr, proc), |
1536 | scm_i_read_hash_procedures_ref ()); | |
1537 | scm_i_read_hash_procedures_set_x (new); | |
fed9c9a2 GH |
1538 | } |
1539 | break; | |
1540 | } | |
bc36d050 | 1541 | if (scm_is_eq (chr, SCM_CAAR (this))) |
fed9c9a2 GH |
1542 | { |
1543 | /* already in the alist. */ | |
7888309b | 1544 | if (scm_is_false (proc)) |
14de3b42 GH |
1545 | { |
1546 | /* remove it. */ | |
7888309b | 1547 | if (scm_is_false (prev)) |
14de3b42 | 1548 | { |
d458073b AR |
1549 | SCM rest = SCM_CDR (scm_i_read_hash_procedures_ref ()); |
1550 | scm_i_read_hash_procedures_set_x (rest); | |
14de3b42 GH |
1551 | } |
1552 | else | |
1553 | scm_set_cdr_x (prev, SCM_CDR (this)); | |
1554 | } | |
fed9c9a2 | 1555 | else |
14de3b42 GH |
1556 | { |
1557 | /* replace it. */ | |
1558 | scm_set_cdr_x (SCM_CAR (this), proc); | |
1559 | } | |
fed9c9a2 GH |
1560 | break; |
1561 | } | |
1562 | prev = this; | |
1563 | this = SCM_CDR (this); | |
1564 | } | |
deca31e1 | 1565 | |
deca31e1 GH |
1566 | return SCM_UNSPECIFIED; |
1567 | } | |
1bbd0b84 | 1568 | #undef FUNC_NAME |
0f2d19dd | 1569 | |
deca31e1 GH |
1570 | /* Recover the read-hash procedure corresponding to char c. */ |
1571 | static SCM | |
6e8d25a6 | 1572 | scm_get_hash_procedure (int c) |
deca31e1 | 1573 | { |
d458073b | 1574 | SCM rest = scm_i_read_hash_procedures_ref (); |
fed9c9a2 | 1575 | |
deca31e1 GH |
1576 | while (1) |
1577 | { | |
d2e53ed6 | 1578 | if (scm_is_null (rest)) |
deca31e1 GH |
1579 | return SCM_BOOL_F; |
1580 | ||
7866a09b | 1581 | if (SCM_CHAR (SCM_CAAR (rest)) == c) |
deca31e1 GH |
1582 | return SCM_CDAR (rest); |
1583 | ||
1584 | rest = SCM_CDR (rest); | |
1585 | } | |
1586 | } | |
1cc91f1b | 1587 | |
889975e5 MG |
1588 | #define SCM_ENCODING_SEARCH_SIZE (500) |
1589 | ||
f8a1c9a8 LC |
1590 | /* Search the first few hundred characters of a file for an Emacs-like coding |
1591 | declaration. Returns either NULL or a string whose storage has been | |
1592 | allocated with `scm_gc_malloc ()'. */ | |
889975e5 | 1593 | char * |
f8a1c9a8 | 1594 | scm_i_scan_for_encoding (SCM port) |
889975e5 | 1595 | { |
d900843c | 1596 | scm_t_port *pt; |
889975e5 | 1597 | char header[SCM_ENCODING_SEARCH_SIZE+1]; |
daedbca7 | 1598 | size_t bytes_read, encoding_length, i; |
889975e5 MG |
1599 | char *encoding = NULL; |
1600 | int utf8_bom = 0; | |
daedbca7 | 1601 | char *pos, *encoding_start; |
889975e5 MG |
1602 | int in_comment; |
1603 | ||
d900843c | 1604 | pt = SCM_PTAB_ENTRY (port); |
49bb5bd3 | 1605 | |
d900843c AW |
1606 | if (pt->rw_active == SCM_PORT_WRITE) |
1607 | scm_flush (port); | |
49bb5bd3 | 1608 | |
d900843c AW |
1609 | if (pt->rw_random) |
1610 | pt->rw_active = SCM_PORT_READ; | |
1611 | ||
1612 | if (pt->read_pos == pt->read_end) | |
1613 | { | |
1614 | /* We can use the read buffer, and thus avoid a seek. */ | |
1615 | if (scm_fill_input (port) == EOF) | |
1616 | return NULL; | |
1617 | ||
1618 | bytes_read = pt->read_end - pt->read_pos; | |
1619 | if (bytes_read > SCM_ENCODING_SEARCH_SIZE) | |
1620 | bytes_read = SCM_ENCODING_SEARCH_SIZE; | |
1621 | ||
1622 | if (bytes_read <= 1) | |
1623 | /* An unbuffered port -- don't scan. */ | |
1624 | return NULL; | |
1625 | ||
1626 | memcpy (header, pt->read_pos, bytes_read); | |
1627 | header[bytes_read] = '\0'; | |
1628 | } | |
1629 | else | |
1630 | { | |
1631 | /* Try to read some bytes and then seek back. Not all ports | |
1632 | support seeking back; and indeed some file ports (like | |
1633 | /dev/urandom) will succeed on an lseek (fd, 0, SEEK_CUR)---the | |
1634 | check performed by SCM_FPORT_FDES---but fail to seek | |
1635 | backwards. Hence this block comes second. We prefer to use | |
1636 | the read buffer in-place. */ | |
1637 | if (SCM_FPORTP (port) && !SCM_FDES_RANDOM_P (SCM_FPORT_FDES (port))) | |
1638 | return NULL; | |
1639 | ||
1640 | bytes_read = scm_c_read (port, header, SCM_ENCODING_SEARCH_SIZE); | |
1641 | header[bytes_read] = '\0'; | |
1642 | scm_seek (port, scm_from_int (0), scm_from_int (SEEK_SET)); | |
1643 | } | |
889975e5 MG |
1644 | |
1645 | if (bytes_read > 3 | |
1646 | && header[0] == '\xef' && header[1] == '\xbb' && header[2] == '\xbf') | |
1647 | utf8_bom = 1; | |
1648 | ||
1649 | /* search past "coding[:=]" */ | |
1650 | pos = header; | |
1651 | while (1) | |
1652 | { | |
1653 | if ((pos = strstr(pos, "coding")) == NULL) | |
1654 | return NULL; | |
1655 | ||
1656 | pos += strlen("coding"); | |
1657 | if (pos - header >= SCM_ENCODING_SEARCH_SIZE || | |
1658 | (*pos == ':' || *pos == '=')) | |
1659 | { | |
1660 | pos ++; | |
1661 | break; | |
1662 | } | |
1663 | } | |
1664 | ||
1665 | /* skip spaces */ | |
1666 | while (pos - header <= SCM_ENCODING_SEARCH_SIZE && | |
1667 | (*pos == ' ' || *pos == '\t')) | |
1668 | pos ++; | |
1669 | ||
1670 | /* grab the next token */ | |
daedbca7 | 1671 | encoding_start = pos; |
889975e5 | 1672 | i = 0; |
daedbca7 MG |
1673 | while (encoding_start + i - header <= SCM_ENCODING_SEARCH_SIZE |
1674 | && encoding_start + i - header < bytes_read | |
1675 | && (isalnum ((int) encoding_start[i]) | |
1676 | || strchr ("_-.:/,+=()", encoding_start[i]) != NULL)) | |
889975e5 MG |
1677 | i++; |
1678 | ||
daedbca7 MG |
1679 | encoding_length = i; |
1680 | if (encoding_length == 0) | |
889975e5 MG |
1681 | return NULL; |
1682 | ||
daedbca7 MG |
1683 | encoding = scm_gc_strndup (encoding_start, encoding_length, "encoding"); |
1684 | for (i = 0; i < encoding_length; i++) | |
026ed239 | 1685 | encoding[i] = toupper ((int) encoding[i]); |
889975e5 MG |
1686 | |
1687 | /* push backwards to make sure we were in a comment */ | |
1688 | in_comment = 0; | |
daedbca7 MG |
1689 | pos = encoding_start; |
1690 | while (pos >= header) | |
889975e5 | 1691 | { |
8a12aeb9 AW |
1692 | if (*pos == ';') |
1693 | { | |
1694 | in_comment = 1; | |
1695 | break; | |
1696 | } | |
1697 | else if (*pos == '\n' || pos == header) | |
889975e5 MG |
1698 | { |
1699 | /* This wasn't in a semicolon comment. Check for a | |
1700 | hash-bang comment. */ | |
1701 | char *beg = strstr (header, "#!"); | |
1702 | char *end = strstr (header, "!#"); | |
8a12aeb9 | 1703 | if (beg < encoding_start && encoding_start + encoding_length <= end) |
889975e5 MG |
1704 | in_comment = 1; |
1705 | break; | |
1706 | } | |
8a12aeb9 AW |
1707 | else |
1708 | { | |
1709 | pos --; | |
1710 | continue; | |
1711 | } | |
889975e5 MG |
1712 | } |
1713 | if (!in_comment) | |
f8a1c9a8 LC |
1714 | /* This wasn't in a comment */ |
1715 | return NULL; | |
1716 | ||
889975e5 | 1717 | if (utf8_bom && strcmp(encoding, "UTF-8")) |
daedbca7 | 1718 | scm_misc_error (NULL, |
889975e5 MG |
1719 | "the port input declares the encoding ~s but is encoded as UTF-8", |
1720 | scm_list_1 (scm_from_locale_string (encoding))); | |
f8a1c9a8 | 1721 | |
889975e5 MG |
1722 | return encoding; |
1723 | } | |
1724 | ||
1725 | SCM_DEFINE (scm_file_encoding, "file-encoding", 1, 0, 0, | |
1726 | (SCM port), | |
a270e133 | 1727 | "Scans the port for an Emacs-like character coding declaration\n" |
ffb62a43 | 1728 | "near the top of the contents of a port with random-accessible contents.\n" |
889975e5 MG |
1729 | "The coding declaration is of the form\n" |
1730 | "@code{coding: XXXXX} and must appear in a scheme comment.\n" | |
1731 | "\n" | |
1732 | "Returns a string containing the character encoding of the file\n" | |
1733 | "if a declaration was found, or @code{#f} otherwise.\n") | |
1734 | #define FUNC_NAME s_scm_file_encoding | |
1735 | { | |
1736 | char *enc; | |
1737 | SCM s_enc; | |
f8a1c9a8 | 1738 | |
d900843c AW |
1739 | SCM_VALIDATE_OPINPORT (SCM_ARG1, port); |
1740 | ||
f8a1c9a8 | 1741 | enc = scm_i_scan_for_encoding (port); |
889975e5 MG |
1742 | if (enc == NULL) |
1743 | return SCM_BOOL_F; | |
1744 | else | |
1745 | { | |
1746 | s_enc = scm_from_locale_string (enc); | |
889975e5 MG |
1747 | return s_enc; |
1748 | } | |
f8a1c9a8 | 1749 | |
889975e5 MG |
1750 | return SCM_BOOL_F; |
1751 | } | |
1752 | #undef FUNC_NAME | |
1753 | ||
0f2d19dd JB |
1754 | void |
1755 | scm_init_read () | |
0f2d19dd | 1756 | { |
d458073b AR |
1757 | SCM read_hash_procs; |
1758 | ||
c81c2ad3 | 1759 | read_hash_procs = scm_make_fluid_with_default (SCM_EOL); |
d458073b AR |
1760 | |
1761 | scm_i_read_hash_procedures = | |
1762 | SCM_VARIABLE_LOC (scm_c_define ("%read-hash-procedures", read_hash_procs)); | |
fed9c9a2 | 1763 | |
62560650 | 1764 | scm_init_opts (scm_read_options, scm_read_opts); |
a0599745 | 1765 | #include "libguile/read.x" |
0f2d19dd | 1766 | } |
89e00824 ML |
1767 | |
1768 | /* | |
1769 | Local Variables: | |
1770 | c-file-style: "gnu" | |
1771 | End: | |
1772 | */ |