Commit | Line | Data |
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0ba0b384 | 1 | /* Copyright (C) 1995,1996,1997,1999,2000,2001,2003, 2004, 2006, 2007, 2008, 2009 Free Software |
dd72382c | 2 | * Foundation, Inc. |
0f2d19dd | 3 | * |
73be1d9e | 4 | * This library is free software; you can redistribute it and/or |
53befeb7 NJ |
5 | * modify it under the terms of the GNU Lesser General Public License |
6 | * as published by the Free Software Foundation; either version 3 of | |
7 | * the License, or (at your option) any later version. | |
0f2d19dd | 8 | * |
53befeb7 NJ |
9 | * This library is distributed in the hope that it will be useful, but |
10 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
73be1d9e MV |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
12 | * Lesser General Public License for more details. | |
0f2d19dd | 13 | * |
73be1d9e MV |
14 | * You should have received a copy of the GNU Lesser General Public |
15 | * License along with this library; if not, write to the Free Software | |
53befeb7 NJ |
16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
17 | * 02110-1301 USA | |
73be1d9e | 18 | */ |
1bbd0b84 | 19 | |
1bbd0b84 | 20 | |
0f2d19dd JB |
21 | \f |
22 | ||
7337d56d LC |
23 | #ifdef HAVE_CONFIG_H |
24 | # include <config.h> | |
25 | #endif | |
26 | ||
0f2d19dd | 27 | #include <stdio.h> |
7337d56d LC |
28 | #include <ctype.h> |
29 | #include <string.h> | |
889975e5 MG |
30 | #include <unistd.h> |
31 | #include <unicase.h> | |
7337d56d | 32 | |
a0599745 | 33 | #include "libguile/_scm.h" |
0ba0b384 | 34 | #include "libguile/bytevectors.h" |
a0599745 MD |
35 | #include "libguile/chars.h" |
36 | #include "libguile/eval.h" | |
37 | #include "libguile/unif.h" | |
38 | #include "libguile/keywords.h" | |
39 | #include "libguile/alist.h" | |
40 | #include "libguile/srcprop.h" | |
41 | #include "libguile/hashtab.h" | |
42 | #include "libguile/hash.h" | |
43 | #include "libguile/ports.h" | |
44 | #include "libguile/root.h" | |
45 | #include "libguile/strings.h" | |
ba1b2226 | 46 | #include "libguile/strports.h" |
a0599745 | 47 | #include "libguile/vectors.h" |
a0599745 | 48 | #include "libguile/validate.h" |
a4022e69 | 49 | #include "libguile/srfi-4.h" |
7337d56d | 50 | #include "libguile/srfi-13.h" |
ba1b2226 | 51 | |
a0599745 | 52 | #include "libguile/read.h" |
22fc179a HWN |
53 | #include "libguile/private-options.h" |
54 | ||
0f2d19dd JB |
55 | |
56 | \f | |
57 | ||
5bf6a6f0 | 58 | SCM_GLOBAL_SYMBOL (scm_sym_dot, "."); |
c7733771 | 59 | SCM_SYMBOL (scm_keyword_prefix, "prefix"); |
ef4cbc08 | 60 | SCM_SYMBOL (scm_keyword_postfix, "postfix"); |
c7733771 | 61 | |
92c2555f | 62 | scm_t_option scm_read_opts[] = { |
b7ff98dd MD |
63 | { SCM_OPTION_BOOLEAN, "copy", 0, |
64 | "Copy source code expressions." }, | |
ac74fc22 | 65 | { SCM_OPTION_BOOLEAN, "positions", 0, |
deca31e1 GH |
66 | "Record positions of source code expressions." }, |
67 | { SCM_OPTION_BOOLEAN, "case-insensitive", 0, | |
c7733771 | 68 | "Convert symbols to lower case."}, |
f1267706 | 69 | { SCM_OPTION_SCM, "keywords", SCM_UNPACK (SCM_BOOL_F), |
904fabb6 | 70 | "Style of keyword recognition: #f, 'prefix or 'postfix."}, |
16353acc | 71 | #if SCM_ENABLE_ELISP |
16353acc NJ |
72 | { SCM_OPTION_BOOLEAN, "elisp-vectors", 0, |
73 | "Support Elisp vector syntax, namely `[...]'."}, | |
cd21f5eb | 74 | { SCM_OPTION_BOOLEAN, "elisp-strings", 0, |
62560650 | 75 | "Support `\\(' and `\\)' in strings."}, |
16353acc | 76 | #endif |
62560650 | 77 | { 0, }, |
a16f6fe7 MD |
78 | }; |
79 | ||
39e8f371 HWN |
80 | /* |
81 | Give meaningful error messages for errors | |
82 | ||
83 | We use the format | |
84 | ||
ba1b2226 | 85 | FILE:LINE:COL: MESSAGE |
39e8f371 HWN |
86 | This happened in .... |
87 | ||
88 | This is not standard GNU format, but the test-suite likes the real | |
89 | message to be in front. | |
90 | ||
39e8f371 HWN |
91 | */ |
92 | ||
93 | ||
a4022e69 MV |
94 | void |
95 | scm_i_input_error (char const *function, | |
96 | SCM port, const char *message, SCM arg) | |
ba1b2226 | 97 | { |
29a837fd MV |
98 | SCM fn = (scm_is_string (SCM_FILENAME(port)) |
99 | ? SCM_FILENAME(port) | |
100 | : scm_from_locale_string ("#<unknown port>")); | |
ba1b2226 | 101 | |
29a837fd | 102 | SCM string_port = scm_open_output_string (); |
ba1b2226 HWN |
103 | SCM string = SCM_EOL; |
104 | scm_simple_format (string_port, | |
272632a6 | 105 | scm_from_locale_string ("~A:~S:~S: ~A"), |
29a837fd | 106 | scm_list_4 (fn, |
b3aa4626 | 107 | scm_from_long (SCM_LINUM (port) + 1), |
b9bd8526 | 108 | scm_from_int (SCM_COL (port) + 1), |
272632a6 | 109 | scm_from_locale_string (message))); |
ba1b2226 HWN |
110 | |
111 | string = scm_get_output_string (string_port); | |
112 | scm_close_output_port (string_port); | |
272632a6 | 113 | scm_error_scm (scm_from_locale_symbol ("read-error"), |
a4022e69 | 114 | function? scm_from_locale_string (function) : SCM_BOOL_F, |
ba1b2226 | 115 | string, |
dd72382c | 116 | arg, |
ba1b2226 HWN |
117 | SCM_BOOL_F); |
118 | } | |
39e8f371 HWN |
119 | |
120 | ||
a1ec6916 | 121 | SCM_DEFINE (scm_read_options, "read-options-interface", 0, 1, 0, |
1bbd0b84 | 122 | (SCM setting), |
dc7fa443 MG |
123 | "Option interface for the read options. Instead of using\n" |
124 | "this procedure directly, use the procedures @code{read-enable},\n" | |
3939e9df | 125 | "@code{read-disable}, @code{read-set!} and @code{read-options}.") |
1bbd0b84 | 126 | #define FUNC_NAME s_scm_read_options |
a16f6fe7 | 127 | { |
b7ff98dd MD |
128 | SCM ans = scm_options (setting, |
129 | scm_read_opts, | |
1bbd0b84 | 130 | FUNC_NAME); |
b7ff98dd MD |
131 | if (SCM_COPY_SOURCE_P) |
132 | SCM_RECORD_POSITIONS_P = 1; | |
a16f6fe7 MD |
133 | return ans; |
134 | } | |
1bbd0b84 | 135 | #undef FUNC_NAME |
a16f6fe7 | 136 | |
14de3b42 GH |
137 | /* An association list mapping extra hash characters to procedures. */ |
138 | static SCM *scm_read_hash_procedures; | |
deca31e1 | 139 | |
0f2d19dd | 140 | |
7337d56d LC |
141 | \f |
142 | /* Token readers. */ | |
0f2d19dd | 143 | |
0f2d19dd | 144 | |
7337d56d LC |
145 | /* Size of the C buffer used to read symbols and numbers. */ |
146 | #define READER_BUFFER_SIZE 128 | |
0f2d19dd | 147 | |
7337d56d LC |
148 | /* Size of the C buffer used to read strings. */ |
149 | #define READER_STRING_BUFFER_SIZE 512 | |
0f2d19dd | 150 | |
7337d56d LC |
151 | /* The maximum size of Scheme character names. */ |
152 | #define READER_CHAR_NAME_MAX_SIZE 50 | |
1cc91f1b | 153 | |
94115ae3 | 154 | |
7337d56d LC |
155 | /* `isblank' is only in C99. */ |
156 | #define CHAR_IS_BLANK_(_chr) \ | |
157 | (((_chr) == ' ') || ((_chr) == '\t') || ((_chr) == '\n') \ | |
d41668fa | 158 | || ((_chr) == '\f') || ((_chr) == '\r')) |
7337d56d LC |
159 | |
160 | #ifdef MSDOS | |
161 | # define CHAR_IS_BLANK(_chr) \ | |
162 | ((CHAR_IS_BLANK_ (chr)) || ((_chr) == 26)) | |
163 | #else | |
164 | # define CHAR_IS_BLANK CHAR_IS_BLANK_ | |
165 | #endif | |
166 | ||
167 | ||
168 | /* R5RS one-character delimiters (see section 7.1.1, ``Lexical | |
169 | structure''). */ | |
170 | #define CHAR_IS_R5RS_DELIMITER(c) \ | |
171 | (CHAR_IS_BLANK (c) \ | |
172 | || (c == ')') || (c == '(') || (c == ';') || (c == '"')) | |
173 | ||
174 | #define CHAR_IS_DELIMITER CHAR_IS_R5RS_DELIMITER | |
175 | ||
176 | /* Exponent markers, as defined in section 7.1.1 of R5RS, ``Lexical | |
177 | Structure''. */ | |
178 | #define CHAR_IS_EXPONENT_MARKER(_chr) \ | |
179 | (((_chr) == 'e') || ((_chr) == 's') || ((_chr) == 'f') \ | |
180 | || ((_chr) == 'd') || ((_chr) == 'l')) | |
181 | ||
454866e0 LC |
182 | /* Read an SCSH block comment. */ |
183 | static inline SCM scm_read_scsh_block_comment (int chr, SCM port); | |
34f3d47d | 184 | static SCM scm_read_commented_expression (int chr, SCM port); |
454866e0 | 185 | |
d41668fa LC |
186 | /* Read from PORT until a delimiter (e.g., a whitespace) is read. Return |
187 | zero if the whole token fits in BUF, non-zero otherwise. */ | |
7337d56d | 188 | static inline int |
889975e5 | 189 | read_token (SCM port, SCM buf, size_t *read) |
0520c320 | 190 | { |
889975e5 | 191 | scm_t_wchar chr; |
7337d56d | 192 | *read = 0; |
0520c320 | 193 | |
889975e5 MG |
194 | buf = scm_i_string_start_writing (buf); |
195 | while (*read < scm_i_string_length (buf)) | |
0520c320 | 196 | { |
7337d56d | 197 | chr = scm_getc (port); |
7337d56d LC |
198 | |
199 | if (chr == EOF) | |
7337d56d | 200 | { |
889975e5 | 201 | scm_i_string_stop_writing (); |
7337d56d LC |
202 | return 0; |
203 | } | |
889975e5 MG |
204 | |
205 | chr = (SCM_CASE_INSENSITIVE_P ? uc_tolower (chr) : chr); | |
206 | ||
207 | if (CHAR_IS_DELIMITER (chr)) | |
7337d56d | 208 | { |
889975e5 MG |
209 | scm_i_string_stop_writing (); |
210 | scm_ungetc (chr, port); | |
211 | return 0; | |
7337d56d | 212 | } |
889975e5 MG |
213 | |
214 | scm_i_string_set_x (buf, *read, chr); | |
215 | (*read)++; | |
0520c320 | 216 | } |
889975e5 | 217 | scm_i_string_stop_writing (); |
7337d56d LC |
218 | |
219 | return 1; | |
0520c320 | 220 | } |
1cc91f1b | 221 | |
889975e5 MG |
222 | static SCM |
223 | read_complete_token (SCM port, size_t *read) | |
224 | { | |
225 | SCM buffer, str = SCM_EOL; | |
226 | size_t len; | |
227 | int overflow; | |
228 | ||
229 | buffer = scm_i_make_string (READER_BUFFER_SIZE, NULL); | |
230 | overflow = read_token (port, buffer, read); | |
231 | if (!overflow) | |
232 | return scm_i_substring (buffer, 0, *read); | |
233 | ||
234 | str = scm_string_copy (buffer); | |
235 | do | |
236 | { | |
237 | overflow = read_token (port, buffer, &len); | |
238 | str = scm_string_append (scm_list_2 (str, buffer)); | |
239 | *read += len; | |
240 | } | |
241 | while (overflow); | |
242 | ||
243 | return scm_i_substring (str, 0, *read); | |
244 | } | |
7337d56d LC |
245 | |
246 | /* Skip whitespace from PORT and return the first non-whitespace character | |
247 | read. Raise an error on end-of-file. */ | |
248 | static int | |
249 | flush_ws (SCM port, const char *eoferr) | |
0f2d19dd | 250 | { |
889975e5 | 251 | register scm_t_wchar c; |
0f2d19dd | 252 | while (1) |
b7f3516f | 253 | switch (c = scm_getc (port)) |
0f2d19dd JB |
254 | { |
255 | case EOF: | |
256 | goteof: | |
257 | if (eoferr) | |
d156d3b7 | 258 | { |
a4022e69 MV |
259 | scm_i_input_error (eoferr, |
260 | port, | |
261 | "end of file", | |
262 | SCM_EOL); | |
d156d3b7 | 263 | } |
0f2d19dd | 264 | return c; |
7337d56d | 265 | |
0f2d19dd JB |
266 | case ';': |
267 | lp: | |
b7f3516f | 268 | switch (c = scm_getc (port)) |
0f2d19dd JB |
269 | { |
270 | case EOF: | |
271 | goto goteof; | |
272 | default: | |
273 | goto lp; | |
274 | case SCM_LINE_INCREMENTORS: | |
275 | break; | |
276 | } | |
277 | break; | |
7337d56d | 278 | |
454866e0 LC |
279 | case '#': |
280 | switch (c = scm_getc (port)) | |
281 | { | |
282 | case EOF: | |
283 | eoferr = "read_sharp"; | |
284 | goto goteof; | |
285 | case '!': | |
286 | scm_read_scsh_block_comment (c, port); | |
287 | break; | |
34f3d47d AW |
288 | case ';': |
289 | scm_read_commented_expression (c, port); | |
290 | break; | |
454866e0 LC |
291 | default: |
292 | scm_ungetc (c, port); | |
293 | return '#'; | |
294 | } | |
295 | break; | |
296 | ||
0f2d19dd | 297 | case SCM_LINE_INCREMENTORS: |
0f2d19dd | 298 | case SCM_SINGLE_SPACES: |
0f2d19dd | 299 | case '\t': |
0f2d19dd | 300 | break; |
7337d56d | 301 | |
0f2d19dd JB |
302 | default: |
303 | return c; | |
304 | } | |
7337d56d LC |
305 | |
306 | return 0; | |
0f2d19dd JB |
307 | } |
308 | ||
309 | ||
7337d56d LC |
310 | \f |
311 | /* Token readers. */ | |
1cc91f1b | 312 | |
7337d56d LC |
313 | static SCM scm_read_expression (SCM port); |
314 | static SCM scm_read_sharp (int chr, SCM port); | |
315 | static SCM scm_get_hash_procedure (int c); | |
316 | static SCM recsexpr (SCM obj, long line, int column, SCM filename); | |
0f2d19dd JB |
317 | |
318 | ||
09a4f039 | 319 | static SCM |
889975e5 | 320 | scm_read_sexp (scm_t_wchar chr, SCM port) |
7337d56d | 321 | #define FUNC_NAME "scm_i_lreadparen" |
09a4f039 | 322 | { |
7337d56d LC |
323 | register int c; |
324 | register SCM tmp; | |
325 | register SCM tl, ans = SCM_EOL; | |
bd22f1c7 | 326 | SCM tl2 = SCM_EOL, ans2 = SCM_EOL, copy = SCM_BOOL_F; |
7337d56d LC |
327 | static const int terminating_char = ')'; |
328 | ||
329 | /* Need to capture line and column numbers here. */ | |
330 | long line = SCM_LINUM (port); | |
331 | int column = SCM_COL (port) - 1; | |
f9c68a47 | 332 | |
f9c68a47 | 333 | |
7337d56d LC |
334 | c = flush_ws (port, FUNC_NAME); |
335 | if (terminating_char == c) | |
336 | return SCM_EOL; | |
f9c68a47 | 337 | |
7337d56d LC |
338 | scm_ungetc (c, port); |
339 | if (scm_is_eq (scm_sym_dot, | |
340 | (tmp = scm_read_expression (port)))) | |
341 | { | |
342 | ans = scm_read_expression (port); | |
343 | if (terminating_char != (c = flush_ws (port, FUNC_NAME))) | |
344 | scm_i_input_error (FUNC_NAME, port, "missing close paren", | |
345 | SCM_EOL); | |
346 | return ans; | |
347 | } | |
1cc91f1b | 348 | |
7337d56d LC |
349 | /* Build the head of the list structure. */ |
350 | ans = tl = scm_cons (tmp, SCM_EOL); | |
351 | ||
352 | if (SCM_COPY_SOURCE_P) | |
353 | ans2 = tl2 = scm_cons (scm_is_pair (tmp) | |
354 | ? copy | |
355 | : tmp, | |
356 | SCM_EOL); | |
357 | ||
358 | while (terminating_char != (c = flush_ws (port, FUNC_NAME))) | |
0f2d19dd | 359 | { |
7337d56d | 360 | SCM new_tail; |
0f2d19dd | 361 | |
7337d56d LC |
362 | scm_ungetc (c, port); |
363 | if (scm_is_eq (scm_sym_dot, | |
364 | (tmp = scm_read_expression (port)))) | |
0f2d19dd | 365 | { |
7337d56d LC |
366 | SCM_SETCDR (tl, tmp = scm_read_expression (port)); |
367 | ||
368 | if (SCM_COPY_SOURCE_P) | |
369 | SCM_SETCDR (tl2, scm_cons (scm_is_pair (tmp) ? copy : tmp, | |
370 | SCM_EOL)); | |
371 | ||
372 | c = flush_ws (port, FUNC_NAME); | |
373 | if (terminating_char != c) | |
374 | scm_i_input_error (FUNC_NAME, port, | |
375 | "in pair: missing close paren", SCM_EOL); | |
376 | goto exit; | |
0f2d19dd | 377 | } |
b858464a | 378 | |
7337d56d LC |
379 | new_tail = scm_cons (tmp, SCM_EOL); |
380 | SCM_SETCDR (tl, new_tail); | |
381 | tl = new_tail; | |
382 | ||
383 | if (SCM_COPY_SOURCE_P) | |
0f2d19dd | 384 | { |
7337d56d LC |
385 | SCM new_tail2 = scm_cons (scm_is_pair (tmp) |
386 | ? copy | |
387 | : tmp, SCM_EOL); | |
388 | SCM_SETCDR (tl2, new_tail2); | |
389 | tl2 = new_tail2; | |
390 | } | |
391 | } | |
0f2d19dd | 392 | |
7337d56d LC |
393 | exit: |
394 | if (SCM_RECORD_POSITIONS_P) | |
395 | scm_whash_insert (scm_source_whash, | |
396 | ans, | |
397 | scm_make_srcprops (line, column, | |
398 | SCM_FILENAME (port), | |
399 | SCM_COPY_SOURCE_P | |
400 | ? ans2 | |
401 | : SCM_UNDEFINED, | |
402 | SCM_EOL)); | |
403 | return ans; | |
404 | } | |
405 | #undef FUNC_NAME | |
a4022e69 | 406 | |
7337d56d LC |
407 | static SCM |
408 | scm_read_string (int chr, SCM port) | |
409 | #define FUNC_NAME "scm_lreadr" | |
410 | { | |
411 | /* For strings smaller than C_STR, this function creates only one Scheme | |
412 | object (the string returned). */ | |
0f2d19dd | 413 | |
7337d56d | 414 | SCM str = SCM_BOOL_F; |
7337d56d | 415 | unsigned c_str_len = 0; |
9c44cd45 | 416 | scm_t_wchar c; |
eb42ff25 | 417 | |
9c44cd45 | 418 | str = scm_i_make_string (READER_STRING_BUFFER_SIZE, NULL); |
7337d56d LC |
419 | while ('"' != (c = scm_getc (port))) |
420 | { | |
421 | if (c == EOF) | |
9c44cd45 MG |
422 | { |
423 | str_eof: | |
424 | scm_i_input_error (FUNC_NAME, port, | |
425 | "end of file in string constant", SCM_EOL); | |
426 | } | |
0f2d19dd | 427 | |
9c44cd45 MG |
428 | if (c_str_len + 1 >= scm_i_string_length (str)) |
429 | { | |
430 | SCM addy = scm_i_make_string (READER_STRING_BUFFER_SIZE, NULL); | |
0f2d19dd | 431 | |
9c44cd45 MG |
432 | str = scm_string_append (scm_list_2 (str, addy)); |
433 | } | |
0f2d19dd | 434 | |
7337d56d | 435 | if (c == '\\') |
9c44cd45 MG |
436 | { |
437 | switch (c = scm_getc (port)) | |
438 | { | |
439 | case EOF: | |
440 | goto str_eof; | |
441 | case '"': | |
442 | case '\\': | |
443 | break; | |
16353acc | 444 | #if SCM_ENABLE_ELISP |
9c44cd45 MG |
445 | case '(': |
446 | case ')': | |
447 | if (SCM_ESCAPED_PARENS_P) | |
448 | break; | |
449 | goto bad_escaped; | |
16353acc | 450 | #endif |
9c44cd45 MG |
451 | case '\n': |
452 | continue; | |
453 | case '0': | |
454 | c = '\0'; | |
455 | break; | |
456 | case 'f': | |
457 | c = '\f'; | |
458 | break; | |
459 | case 'n': | |
460 | c = '\n'; | |
461 | break; | |
462 | case 'r': | |
463 | c = '\r'; | |
464 | break; | |
465 | case 't': | |
466 | c = '\t'; | |
467 | break; | |
468 | case 'a': | |
469 | c = '\007'; | |
470 | break; | |
471 | case 'v': | |
472 | c = '\v'; | |
473 | break; | |
474 | case 'x': | |
475 | { | |
476 | scm_t_wchar a, b; | |
477 | a = scm_getc (port); | |
478 | if (a == EOF) | |
479 | goto str_eof; | |
480 | b = scm_getc (port); | |
481 | if (b == EOF) | |
482 | goto str_eof; | |
483 | if ('0' <= a && a <= '9') | |
484 | a -= '0'; | |
485 | else if ('A' <= a && a <= 'F') | |
486 | a = a - 'A' + 10; | |
487 | else if ('a' <= a && a <= 'f') | |
488 | a = a - 'a' + 10; | |
489 | else | |
490 | { | |
491 | c = a; | |
492 | goto bad_escaped; | |
493 | } | |
494 | if ('0' <= b && b <= '9') | |
495 | b -= '0'; | |
496 | else if ('A' <= b && b <= 'F') | |
497 | b = b - 'A' + 10; | |
498 | else if ('a' <= b && b <= 'f') | |
499 | b = b - 'a' + 10; | |
500 | else | |
501 | { | |
502 | c = b; | |
503 | goto bad_escaped; | |
504 | } | |
505 | c = a * 16 + b; | |
506 | break; | |
507 | } | |
508 | case 'u': | |
509 | { | |
510 | scm_t_wchar a; | |
511 | int i; | |
512 | c = 0; | |
513 | for (i = 0; i < 4; i++) | |
514 | { | |
515 | a = scm_getc (port); | |
516 | if (a == EOF) | |
517 | goto str_eof; | |
518 | if ('0' <= a && a <= '9') | |
519 | a -= '0'; | |
520 | else if ('A' <= a && a <= 'F') | |
521 | a = a - 'A' + 10; | |
522 | else if ('a' <= a && a <= 'f') | |
523 | a = a - 'a' + 10; | |
524 | else | |
525 | { | |
526 | c = a; | |
527 | goto bad_escaped; | |
528 | } | |
529 | c = c * 16 + a; | |
530 | } | |
531 | break; | |
532 | } | |
533 | case 'U': | |
534 | { | |
535 | scm_t_wchar a; | |
536 | int i; | |
537 | c = 0; | |
538 | for (i = 0; i < 6; i++) | |
539 | { | |
540 | a = scm_getc (port); | |
541 | if (a == EOF) | |
542 | goto str_eof; | |
543 | if ('0' <= a && a <= '9') | |
544 | a -= '0'; | |
545 | else if ('A' <= a && a <= 'F') | |
546 | a = a - 'A' + 10; | |
547 | else if ('a' <= a && a <= 'f') | |
548 | a = a - 'a' + 10; | |
549 | else | |
550 | { | |
551 | c = a; | |
552 | goto bad_escaped; | |
553 | } | |
554 | c = c * 16 + a; | |
555 | } | |
556 | break; | |
557 | } | |
558 | default: | |
559 | bad_escaped: | |
560 | scm_i_input_error (FUNC_NAME, port, | |
561 | "illegal character in escape sequence: ~S", | |
562 | scm_list_1 (SCM_MAKE_CHAR (c))); | |
563 | } | |
564 | } | |
565 | str = scm_i_string_start_writing (str); | |
566 | scm_i_string_set_x (str, c_str_len++, c); | |
567 | scm_i_string_stop_writing (); | |
7337d56d | 568 | } |
f13b4400 | 569 | |
7337d56d LC |
570 | if (c_str_len > 0) |
571 | { | |
9c44cd45 | 572 | return scm_i_substring_copy (str, 0, c_str_len); |
0f2d19dd | 573 | } |
9c44cd45 MG |
574 | |
575 | return scm_nullstr; | |
0f2d19dd | 576 | } |
db4b4ca6 DH |
577 | #undef FUNC_NAME |
578 | ||
0f2d19dd | 579 | |
7337d56d | 580 | static SCM |
889975e5 | 581 | scm_read_number (scm_t_wchar chr, SCM port) |
0f2d19dd | 582 | { |
889975e5 MG |
583 | SCM result; |
584 | SCM buffer; | |
7337d56d | 585 | size_t read; |
0f2d19dd | 586 | |
7337d56d | 587 | scm_ungetc (chr, port); |
889975e5 MG |
588 | buffer = read_complete_token (port, &read); |
589 | result = scm_string_to_number (buffer, SCM_UNDEFINED); | |
590 | if (!scm_is_true (result)) | |
591 | /* Return a symbol instead of a number. */ | |
592 | result = scm_string_to_symbol (buffer); | |
0f2d19dd | 593 | |
7337d56d LC |
594 | return result; |
595 | } | |
0f2d19dd | 596 | |
7337d56d | 597 | static SCM |
889975e5 | 598 | scm_read_mixed_case_symbol (scm_t_wchar chr, SCM port) |
7337d56d | 599 | { |
889975e5 MG |
600 | SCM result; |
601 | int ends_with_colon = 0; | |
602 | SCM buffer; | |
7337d56d | 603 | size_t read = 0; |
ef4cbc08 | 604 | int postfix = scm_is_eq (SCM_PACK (SCM_KEYWORD_STYLE), scm_keyword_postfix); |
7337d56d LC |
605 | |
606 | scm_ungetc (chr, port); | |
889975e5 MG |
607 | buffer = read_complete_token (port, &read); |
608 | if (read > 0) | |
609 | ends_with_colon = scm_i_string_ref (buffer, read - 1) == ':'; | |
ef4cbc08 | 610 | |
889975e5 MG |
611 | if (postfix && ends_with_colon && (read > 1)) |
612 | result = scm_symbol_to_keyword (scm_string_to_symbol (scm_i_substring (buffer, 0, read - 1))); | |
7337d56d | 613 | else |
889975e5 | 614 | result = scm_string_to_symbol (buffer); |
7337d56d LC |
615 | |
616 | return result; | |
617 | } | |
618 | ||
619 | static SCM | |
889975e5 | 620 | scm_read_number_and_radix (scm_t_wchar chr, SCM port) |
7337d56d LC |
621 | #define FUNC_NAME "scm_lreadr" |
622 | { | |
889975e5 | 623 | SCM result; |
7337d56d | 624 | size_t read; |
889975e5 | 625 | SCM buffer = scm_i_make_string (READER_BUFFER_SIZE, NULL); |
7337d56d | 626 | unsigned int radix; |
7337d56d LC |
627 | |
628 | switch (chr) | |
629 | { | |
630 | case 'B': | |
631 | case 'b': | |
632 | radix = 2; | |
633 | break; | |
634 | ||
635 | case 'o': | |
636 | case 'O': | |
637 | radix = 8; | |
638 | break; | |
639 | ||
640 | case 'd': | |
641 | case 'D': | |
642 | radix = 10; | |
643 | break; | |
644 | ||
645 | case 'x': | |
646 | case 'X': | |
647 | radix = 16; | |
648 | break; | |
649 | ||
650 | default: | |
651 | scm_ungetc (chr, port); | |
652 | scm_ungetc ('#', port); | |
653 | radix = 10; | |
654 | } | |
655 | ||
889975e5 MG |
656 | buffer = read_complete_token (port, &read); |
657 | result = scm_string_to_number (buffer, scm_from_uint (radix)); | |
7337d56d LC |
658 | |
659 | if (scm_is_true (result)) | |
660 | return result; | |
661 | ||
662 | scm_i_input_error (FUNC_NAME, port, "unknown # object", SCM_EOL); | |
663 | ||
664 | return SCM_BOOL_F; | |
665 | } | |
666 | #undef FUNC_NAME | |
667 | ||
668 | static SCM | |
669 | scm_read_quote (int chr, SCM port) | |
670 | { | |
671 | SCM p; | |
492faee1 LC |
672 | long line = SCM_LINUM (port); |
673 | int column = SCM_COL (port) - 1; | |
7337d56d LC |
674 | |
675 | switch (chr) | |
676 | { | |
677 | case '`': | |
678 | p = scm_sym_quasiquote; | |
679 | break; | |
680 | ||
681 | case '\'': | |
682 | p = scm_sym_quote; | |
683 | break; | |
684 | ||
685 | case ',': | |
686 | { | |
889975e5 | 687 | scm_t_wchar c; |
7337d56d LC |
688 | |
689 | c = scm_getc (port); | |
690 | if ('@' == c) | |
691 | p = scm_sym_uq_splicing; | |
692 | else | |
0f2d19dd | 693 | { |
7337d56d LC |
694 | scm_ungetc (c, port); |
695 | p = scm_sym_unquote; | |
0f2d19dd | 696 | } |
7337d56d LC |
697 | break; |
698 | } | |
0f2d19dd | 699 | |
7337d56d LC |
700 | default: |
701 | fprintf (stderr, "%s: unhandled quote character (%i)\n", | |
7f74cf9a | 702 | "scm_read_quote", chr); |
7337d56d | 703 | abort (); |
0f2d19dd | 704 | } |
1cc91f1b | 705 | |
7337d56d | 706 | p = scm_cons2 (p, scm_read_expression (port), SCM_EOL); |
492faee1 LC |
707 | if (SCM_RECORD_POSITIONS_P) |
708 | scm_whash_insert (scm_source_whash, p, | |
709 | scm_make_srcprops (line, column, | |
710 | SCM_FILENAME (port), | |
711 | SCM_COPY_SOURCE_P | |
712 | ? (scm_cons2 (SCM_CAR (p), | |
713 | SCM_CAR (SCM_CDR (p)), | |
714 | SCM_EOL)) | |
715 | : SCM_UNDEFINED, | |
716 | SCM_EOL)); | |
717 | ||
0f2d19dd | 718 | |
7337d56d LC |
719 | return p; |
720 | } | |
721 | ||
34f3d47d AW |
722 | SCM_SYMBOL (sym_syntax, "syntax"); |
723 | SCM_SYMBOL (sym_quasisyntax, "quasisyntax"); | |
724 | SCM_SYMBOL (sym_unsyntax, "unsyntax"); | |
725 | SCM_SYMBOL (sym_unsyntax_splicing, "unsyntax-splicing"); | |
726 | ||
727 | static SCM | |
728 | scm_read_syntax (int chr, SCM port) | |
729 | { | |
730 | SCM p; | |
731 | long line = SCM_LINUM (port); | |
732 | int column = SCM_COL (port) - 1; | |
733 | ||
734 | switch (chr) | |
735 | { | |
736 | case '`': | |
737 | p = sym_quasisyntax; | |
738 | break; | |
739 | ||
740 | case '\'': | |
741 | p = sym_syntax; | |
742 | break; | |
743 | ||
744 | case ',': | |
745 | { | |
746 | int c; | |
747 | ||
748 | c = scm_getc (port); | |
749 | if ('@' == c) | |
750 | p = sym_unsyntax_splicing; | |
751 | else | |
752 | { | |
753 | scm_ungetc (c, port); | |
754 | p = sym_unsyntax; | |
755 | } | |
756 | break; | |
757 | } | |
758 | ||
759 | default: | |
760 | fprintf (stderr, "%s: unhandled syntax character (%i)\n", | |
761 | "scm_read_syntax", chr); | |
762 | abort (); | |
763 | } | |
764 | ||
765 | p = scm_cons2 (p, scm_read_expression (port), SCM_EOL); | |
766 | if (SCM_RECORD_POSITIONS_P) | |
767 | scm_whash_insert (scm_source_whash, p, | |
768 | scm_make_srcprops (line, column, | |
769 | SCM_FILENAME (port), | |
770 | SCM_COPY_SOURCE_P | |
771 | ? (scm_cons2 (SCM_CAR (p), | |
772 | SCM_CAR (SCM_CDR (p)), | |
773 | SCM_EOL)) | |
774 | : SCM_UNDEFINED, | |
775 | SCM_EOL)); | |
776 | ||
777 | ||
778 | return p; | |
779 | } | |
780 | ||
7337d56d LC |
781 | static inline SCM |
782 | scm_read_semicolon_comment (int chr, SCM port) | |
0f2d19dd | 783 | { |
0f2d19dd JB |
784 | int c; |
785 | ||
889975e5 MG |
786 | /* We use the get_byte here because there is no need to get the |
787 | locale correct with comment input. This presumes that newline | |
788 | always represents itself no matter what the encoding is. */ | |
789 | for (c = scm_get_byte_or_eof (port); | |
7337d56d LC |
790 | (c != EOF) && (c != '\n'); |
791 | c = scm_getc (port)); | |
792 | ||
793 | return SCM_UNSPECIFIED; | |
794 | } | |
795 | ||
796 | \f | |
797 | /* Sharp readers, i.e. readers called after a `#' sign has been read. */ | |
798 | ||
799 | static SCM | |
800 | scm_read_boolean (int chr, SCM port) | |
801 | { | |
802 | switch (chr) | |
0f2d19dd | 803 | { |
7337d56d LC |
804 | case 't': |
805 | case 'T': | |
806 | return SCM_BOOL_T; | |
807 | ||
808 | case 'f': | |
809 | case 'F': | |
810 | return SCM_BOOL_F; | |
0f2d19dd | 811 | } |
7337d56d LC |
812 | |
813 | return SCM_UNSPECIFIED; | |
814 | } | |
815 | ||
816 | static SCM | |
889975e5 | 817 | scm_read_character (scm_t_wchar chr, SCM port) |
7337d56d LC |
818 | #define FUNC_NAME "scm_lreadr" |
819 | { | |
77332b21 | 820 | SCM ch; |
889975e5 | 821 | SCM charname = scm_i_make_string (READER_CHAR_NAME_MAX_SIZE, NULL); |
7337d56d | 822 | size_t charname_len; |
889975e5 MG |
823 | scm_t_wchar cp; |
824 | int overflow; | |
825 | ||
826 | overflow = read_token (port, charname, &charname_len); | |
827 | charname = scm_c_substring (charname, 0, charname_len); | |
7337d56d | 828 | |
889975e5 | 829 | if (overflow) |
7337d56d LC |
830 | goto char_error; |
831 | ||
832 | if (charname_len == 0) | |
0f2d19dd | 833 | { |
7337d56d LC |
834 | chr = scm_getc (port); |
835 | if (chr == EOF) | |
836 | scm_i_input_error (FUNC_NAME, port, "unexpected end of file " | |
837 | "while reading character", SCM_EOL); | |
838 | ||
839 | /* CHR must be a token delimiter, like a whitespace. */ | |
840 | return (SCM_MAKE_CHAR (chr)); | |
0f2d19dd | 841 | } |
7337d56d LC |
842 | |
843 | if (charname_len == 1) | |
889975e5 | 844 | return SCM_MAKE_CHAR (scm_i_string_ref (charname, 0)); |
7337d56d | 845 | |
889975e5 MG |
846 | cp = scm_i_string_ref (charname, 0); |
847 | if (cp >= '0' && cp < '8') | |
7337d56d LC |
848 | { |
849 | /* Dirk:FIXME:: This type of character syntax is not R5RS | |
850 | * compliant. Further, it should be verified that the constant | |
851 | * does only consist of octal digits. Finally, it should be | |
852 | * checked whether the resulting fixnum is in the range of | |
853 | * characters. */ | |
889975e5 | 854 | SCM p = scm_string_to_number (charname, scm_from_uint (8)); |
7337d56d LC |
855 | if (SCM_I_INUMP (p)) |
856 | return SCM_MAKE_CHAR (SCM_I_INUM (p)); | |
857 | } | |
858 | ||
889975e5 MG |
859 | /* The names of characters should never have non-Latin1 |
860 | characters. */ | |
861 | if (scm_i_is_narrow_string (charname) | |
862 | || scm_i_try_narrow_string (charname)) | |
863 | ch = scm_i_charname_to_char (scm_i_string_chars (charname), | |
864 | charname_len); | |
77332b21 MG |
865 | if (scm_is_true (ch)) |
866 | return ch; | |
7337d56d LC |
867 | |
868 | char_error: | |
869 | scm_i_input_error (FUNC_NAME, port, "unknown character name ~a", | |
889975e5 | 870 | scm_list_1 (charname)); |
7337d56d LC |
871 | |
872 | return SCM_UNSPECIFIED; | |
0f2d19dd | 873 | } |
db4b4ca6 | 874 | #undef FUNC_NAME |
0f2d19dd | 875 | |
7337d56d LC |
876 | static inline SCM |
877 | scm_read_keyword (int chr, SCM port) | |
878 | { | |
879 | SCM symbol; | |
880 | ||
881 | /* Read the symbol that comprises the keyword. Doing this instead of | |
882 | invoking a specific symbol reader function allows `scm_read_keyword ()' | |
883 | to adapt to the delimiters currently valid of symbols. | |
1cc91f1b | 884 | |
7337d56d LC |
885 | XXX: This implementation allows sloppy syntaxes like `#: key'. */ |
886 | symbol = scm_read_expression (port); | |
887 | if (!scm_is_symbol (symbol)) | |
7f74cf9a | 888 | scm_i_input_error ("scm_read_keyword", port, |
7337d56d LC |
889 | "keyword prefix `~a' not followed by a symbol: ~s", |
890 | scm_list_2 (SCM_MAKE_CHAR (chr), symbol)); | |
891 | ||
892 | return (scm_symbol_to_keyword (symbol)); | |
893 | } | |
894 | ||
895 | static inline SCM | |
896 | scm_read_vector (int chr, SCM port) | |
09a4f039 | 897 | { |
7337d56d LC |
898 | /* Note: We call `scm_read_sexp ()' rather than READER here in order to |
899 | guarantee that it's going to do what we want. After all, this is an | |
900 | implementation detail of `scm_read_vector ()', not a desirable | |
901 | property. */ | |
902 | return (scm_vector (scm_read_sexp (chr, port))); | |
903 | } | |
09a4f039 | 904 | |
7337d56d LC |
905 | static inline SCM |
906 | scm_read_srfi4_vector (int chr, SCM port) | |
907 | { | |
908 | return scm_i_read_array (port, chr); | |
909 | } | |
910 | ||
0ba0b384 | 911 | static SCM |
889975e5 | 912 | scm_read_bytevector (scm_t_wchar chr, SCM port) |
0ba0b384 LC |
913 | { |
914 | chr = scm_getc (port); | |
915 | if (chr != 'u') | |
916 | goto syntax; | |
917 | ||
918 | chr = scm_getc (port); | |
919 | if (chr != '8') | |
920 | goto syntax; | |
921 | ||
922 | chr = scm_getc (port); | |
923 | if (chr != '(') | |
924 | goto syntax; | |
925 | ||
926 | return scm_u8_list_to_bytevector (scm_read_sexp (chr, port)); | |
927 | ||
928 | syntax: | |
929 | scm_i_input_error ("read_bytevector", port, | |
930 | "invalid bytevector prefix", | |
931 | SCM_MAKE_CHAR (chr)); | |
932 | return SCM_UNSPECIFIED; | |
933 | } | |
934 | ||
7337d56d | 935 | static SCM |
889975e5 | 936 | scm_read_guile_bit_vector (scm_t_wchar chr, SCM port) |
7337d56d LC |
937 | { |
938 | /* Read the `#*10101'-style read syntax for bit vectors in Guile. This is | |
939 | terribly inefficient but who cares? */ | |
940 | SCM s_bits = SCM_EOL; | |
941 | ||
942 | for (chr = scm_getc (port); | |
943 | (chr != EOF) && ((chr == '0') || (chr == '1')); | |
944 | chr = scm_getc (port)) | |
09a4f039 | 945 | { |
7337d56d | 946 | s_bits = scm_cons ((chr == '0') ? SCM_BOOL_F : SCM_BOOL_T, s_bits); |
09a4f039 | 947 | } |
7337d56d LC |
948 | |
949 | if (chr != EOF) | |
950 | scm_ungetc (chr, port); | |
951 | ||
952 | return scm_bitvector (scm_reverse_x (s_bits, SCM_EOL)); | |
953 | } | |
954 | ||
955 | static inline SCM | |
889975e5 | 956 | scm_read_scsh_block_comment (scm_t_wchar chr, SCM port) |
7337d56d LC |
957 | { |
958 | int bang_seen = 0; | |
959 | ||
889975e5 MG |
960 | /* We can use the get_byte here because there is no need to get the |
961 | locale correct when reading comments. This presumes that | |
962 | hash and exclamation points always represent themselves no | |
963 | matter what the source encoding is.*/ | |
7337d56d | 964 | for (;;) |
09a4f039 | 965 | { |
889975e5 | 966 | int c = scm_get_byte_or_eof (port); |
62850ef3 | 967 | |
7337d56d LC |
968 | if (c == EOF) |
969 | scm_i_input_error ("skip_block_comment", port, | |
970 | "unterminated `#! ... !#' comment", SCM_EOL); | |
971 | ||
972 | if (c == '!') | |
973 | bang_seen = 1; | |
974 | else if (c == '#' && bang_seen) | |
975 | break; | |
976 | else | |
977 | bang_seen = 0; | |
978 | } | |
979 | ||
980 | return SCM_UNSPECIFIED; | |
981 | } | |
982 | ||
34f3d47d | 983 | static SCM |
889975e5 | 984 | scm_read_commented_expression (scm_t_wchar chr, SCM port) |
34f3d47d | 985 | { |
889975e5 | 986 | scm_t_wchar c; |
34f3d47d AW |
987 | |
988 | c = flush_ws (port, (char *) NULL); | |
989 | if (EOF == c) | |
990 | scm_i_input_error ("read_commented_expression", port, | |
991 | "no expression after #; comment", SCM_EOL); | |
992 | scm_ungetc (c, port); | |
993 | scm_read_expression (port); | |
994 | return SCM_UNSPECIFIED; | |
995 | } | |
996 | ||
7337d56d | 997 | static SCM |
889975e5 | 998 | scm_read_extended_symbol (scm_t_wchar chr, SCM port) |
7337d56d LC |
999 | { |
1000 | /* Guile's extended symbol read syntax looks like this: | |
1001 | ||
1002 | #{This is all a symbol name}# | |
1003 | ||
1004 | So here, CHR is expected to be `{'. */ | |
7337d56d LC |
1005 | int saw_brace = 0, finished = 0; |
1006 | size_t len = 0; | |
889975e5 | 1007 | SCM buf = scm_i_make_string (1024, NULL); |
7337d56d | 1008 | |
889975e5 | 1009 | buf = scm_i_string_start_writing (buf); |
7337d56d LC |
1010 | |
1011 | while ((chr = scm_getc (port)) != EOF) | |
1012 | { | |
1013 | if (saw_brace) | |
09a4f039 | 1014 | { |
7337d56d LC |
1015 | if (chr == '#') |
1016 | { | |
1017 | finished = 1; | |
1018 | break; | |
1019 | } | |
1020 | else | |
1021 | { | |
1022 | saw_brace = 0; | |
889975e5 MG |
1023 | scm_i_string_set_x (buf, len++, '}'); |
1024 | scm_i_string_set_x (buf, len++, chr); | |
7337d56d | 1025 | } |
09a4f039 | 1026 | } |
7337d56d LC |
1027 | else if (chr == '}') |
1028 | saw_brace = 1; | |
1029 | else | |
889975e5 | 1030 | scm_i_string_set_x (buf, len++, chr); |
62850ef3 | 1031 | |
889975e5 | 1032 | if (len >= scm_i_string_length (buf) - 2) |
7337d56d | 1033 | { |
889975e5 MG |
1034 | scm_i_string_stop_writing (); |
1035 | SCM addy = scm_i_make_string (1024, NULL); | |
1036 | buf = scm_string_append (scm_list_2 (buf, addy)); | |
7337d56d | 1037 | len = 0; |
889975e5 | 1038 | buf = scm_i_string_start_writing (buf); |
7337d56d | 1039 | } |
62850ef3 | 1040 | |
7337d56d LC |
1041 | if (finished) |
1042 | break; | |
1043 | } | |
889975e5 | 1044 | scm_i_string_stop_writing (); |
7337d56d | 1045 | |
889975e5 | 1046 | return (scm_string_to_symbol (scm_c_substring (buf, 0, len))); |
7337d56d LC |
1047 | } |
1048 | ||
1049 | ||
1050 | \f | |
1051 | /* Top-level token readers, i.e., dispatchers. */ | |
1052 | ||
1053 | static SCM | |
1054 | scm_read_sharp_extension (int chr, SCM port) | |
1055 | { | |
1056 | SCM proc; | |
1057 | ||
1058 | proc = scm_get_hash_procedure (chr); | |
1059 | if (scm_is_true (scm_procedure_p (proc))) | |
1060 | { | |
1061 | long line = SCM_LINUM (port); | |
1062 | int column = SCM_COL (port) - 2; | |
1063 | SCM got; | |
1064 | ||
1065 | got = scm_call_2 (proc, SCM_MAKE_CHAR (chr), port); | |
1066 | if (!scm_is_eq (got, SCM_UNSPECIFIED)) | |
62850ef3 | 1067 | { |
7337d56d LC |
1068 | if (SCM_RECORD_POSITIONS_P) |
1069 | return (recsexpr (got, line, column, | |
1070 | SCM_FILENAME (port))); | |
1071 | else | |
1072 | return got; | |
62850ef3 | 1073 | } |
09a4f039 | 1074 | } |
7337d56d LC |
1075 | |
1076 | return SCM_UNSPECIFIED; | |
1077 | } | |
1078 | ||
1079 | /* The reader for the sharp `#' character. It basically dispatches reads | |
1080 | among the above token readers. */ | |
1081 | static SCM | |
889975e5 | 1082 | scm_read_sharp (scm_t_wchar chr, SCM port) |
7337d56d LC |
1083 | #define FUNC_NAME "scm_lreadr" |
1084 | { | |
1085 | SCM result; | |
1086 | ||
1087 | chr = scm_getc (port); | |
1088 | ||
1089 | result = scm_read_sharp_extension (chr, port); | |
1090 | if (!scm_is_eq (result, SCM_UNSPECIFIED)) | |
1091 | return result; | |
1092 | ||
1093 | switch (chr) | |
1094 | { | |
1095 | case '\\': | |
1096 | return (scm_read_character (chr, port)); | |
1097 | case '(': | |
1098 | return (scm_read_vector (chr, port)); | |
1099 | case 's': | |
1100 | case 'u': | |
1101 | case 'f': | |
1102 | /* This one may return either a boolean or an SRFI-4 vector. */ | |
1103 | return (scm_read_srfi4_vector (chr, port)); | |
0ba0b384 LC |
1104 | case 'v': |
1105 | return (scm_read_bytevector (chr, port)); | |
7337d56d LC |
1106 | case '*': |
1107 | return (scm_read_guile_bit_vector (chr, port)); | |
1108 | case 't': | |
1109 | case 'T': | |
1110 | case 'F': | |
1111 | /* This one may return either a boolean or an SRFI-4 vector. */ | |
1112 | return (scm_read_boolean (chr, port)); | |
1113 | case ':': | |
1114 | return (scm_read_keyword (chr, port)); | |
1115 | case '0': case '1': case '2': case '3': case '4': | |
1116 | case '5': case '6': case '7': case '8': case '9': | |
1117 | case '@': | |
1118 | #if SCM_ENABLE_DEPRECATED | |
1119 | /* See below for 'i' and 'e'. */ | |
1120 | case 'a': | |
1121 | case 'c': | |
1122 | case 'y': | |
1123 | case 'h': | |
1124 | case 'l': | |
1125 | #endif | |
1126 | return (scm_i_read_array (port, chr)); | |
1127 | ||
1128 | case 'i': | |
1129 | case 'e': | |
1130 | #if SCM_ENABLE_DEPRECATED | |
1131 | { | |
1132 | /* When next char is '(', it really is an old-style | |
1133 | uniform array. */ | |
889975e5 | 1134 | scm_t_wchar next_c = scm_getc (port); |
7337d56d LC |
1135 | if (next_c != EOF) |
1136 | scm_ungetc (next_c, port); | |
1137 | if (next_c == '(') | |
1138 | return scm_i_read_array (port, chr); | |
1139 | /* Fall through. */ | |
1140 | } | |
1141 | #endif | |
1142 | case 'b': | |
1143 | case 'B': | |
1144 | case 'o': | |
1145 | case 'O': | |
1146 | case 'd': | |
1147 | case 'D': | |
1148 | case 'x': | |
1149 | case 'X': | |
1150 | case 'I': | |
1151 | case 'E': | |
1152 | return (scm_read_number_and_radix (chr, port)); | |
1153 | case '{': | |
1154 | return (scm_read_extended_symbol (chr, port)); | |
1155 | case '!': | |
1156 | return (scm_read_scsh_block_comment (chr, port)); | |
34f3d47d AW |
1157 | case ';': |
1158 | return (scm_read_commented_expression (chr, port)); | |
1159 | case '`': | |
1160 | case '\'': | |
1161 | case ',': | |
1162 | return (scm_read_syntax (chr, port)); | |
7337d56d LC |
1163 | default: |
1164 | result = scm_read_sharp_extension (chr, port); | |
1165 | if (scm_is_eq (result, SCM_UNSPECIFIED)) | |
1166 | scm_i_input_error (FUNC_NAME, port, "Unknown # object: ~S", | |
1167 | scm_list_1 (SCM_MAKE_CHAR (chr))); | |
1168 | else | |
1169 | return result; | |
1170 | } | |
1171 | ||
1172 | return SCM_UNSPECIFIED; | |
1173 | } | |
1174 | #undef FUNC_NAME | |
1175 | ||
1176 | static SCM | |
1177 | scm_read_expression (SCM port) | |
1178 | #define FUNC_NAME "scm_read_expression" | |
1179 | { | |
1180 | while (1) | |
1181 | { | |
889975e5 | 1182 | register scm_t_wchar chr; |
7337d56d LC |
1183 | |
1184 | chr = scm_getc (port); | |
1185 | ||
1186 | switch (chr) | |
1187 | { | |
1188 | case SCM_WHITE_SPACES: | |
1189 | case SCM_LINE_INCREMENTORS: | |
1190 | break; | |
1191 | case ';': | |
1192 | (void) scm_read_semicolon_comment (chr, port); | |
1193 | break; | |
1194 | case '(': | |
1195 | return (scm_read_sexp (chr, port)); | |
1196 | case '"': | |
1197 | return (scm_read_string (chr, port)); | |
1198 | case '\'': | |
1199 | case '`': | |
1200 | case ',': | |
1201 | return (scm_read_quote (chr, port)); | |
1202 | case '#': | |
1203 | { | |
1204 | SCM result; | |
1205 | result = scm_read_sharp (chr, port); | |
1206 | if (scm_is_eq (result, SCM_UNSPECIFIED)) | |
1207 | /* We read a comment or some such. */ | |
1208 | break; | |
1209 | else | |
1210 | return result; | |
1211 | } | |
1212 | case ')': | |
1213 | scm_i_input_error (FUNC_NAME, port, "unexpected \")\"", SCM_EOL); | |
1214 | break; | |
1215 | case EOF: | |
1216 | return SCM_EOF_VAL; | |
1217 | case ':': | |
1218 | if (scm_is_eq (SCM_PACK (SCM_KEYWORD_STYLE), scm_keyword_prefix)) | |
1219 | return scm_symbol_to_keyword (scm_read_expression (port)); | |
1220 | /* Fall through. */ | |
1221 | ||
1222 | default: | |
1223 | { | |
1224 | if (((chr >= '0') && (chr <= '9')) | |
1225 | || (strchr ("+-.", chr))) | |
1226 | return (scm_read_number (chr, port)); | |
1227 | else | |
1228 | return (scm_read_mixed_case_symbol (chr, port)); | |
1229 | } | |
1230 | } | |
1231 | } | |
1232 | } | |
1233 | #undef FUNC_NAME | |
1234 | ||
1235 | \f | |
1236 | /* Actual reader. */ | |
1237 | ||
1238 | SCM_DEFINE (scm_read, "read", 0, 1, 0, | |
1239 | (SCM port), | |
1240 | "Read an s-expression from the input port @var{port}, or from\n" | |
1241 | "the current input port if @var{port} is not specified.\n" | |
1242 | "Any whitespace before the next token is discarded.") | |
1243 | #define FUNC_NAME s_scm_read | |
1244 | { | |
1245 | int c; | |
1246 | ||
1247 | if (SCM_UNBNDP (port)) | |
1248 | port = scm_current_input_port (); | |
1249 | SCM_VALIDATE_OPINPORT (1, port); | |
1250 | ||
1251 | c = flush_ws (port, (char *) NULL); | |
1252 | if (EOF == c) | |
1253 | return SCM_EOF_VAL; | |
1254 | scm_ungetc (c, port); | |
1255 | ||
1256 | return (scm_read_expression (port)); | |
09a4f039 | 1257 | } |
db4b4ca6 | 1258 | #undef FUNC_NAME |
09a4f039 | 1259 | |
0f2d19dd JB |
1260 | |
1261 | \f | |
1262 | ||
7337d56d LC |
1263 | /* Used when recording expressions constructed by `scm_read_sharp ()'. */ |
1264 | static SCM | |
1265 | recsexpr (SCM obj, long line, int column, SCM filename) | |
1266 | { | |
1267 | if (!scm_is_pair(obj)) { | |
1268 | return obj; | |
1269 | } else { | |
1270 | SCM tmp = obj, copy; | |
1271 | /* If this sexpr is visible in the read:sharp source, we want to | |
1272 | keep that information, so only record non-constant cons cells | |
1273 | which haven't previously been read by the reader. */ | |
1274 | if (scm_is_false (scm_whash_lookup (scm_source_whash, obj))) | |
1275 | { | |
1276 | if (SCM_COPY_SOURCE_P) | |
1277 | { | |
1278 | copy = scm_cons (recsexpr (SCM_CAR (obj), line, column, filename), | |
1279 | SCM_UNDEFINED); | |
1280 | while ((tmp = SCM_CDR (tmp)) && scm_is_pair (tmp)) | |
1281 | { | |
1282 | SCM_SETCDR (copy, scm_cons (recsexpr (SCM_CAR (tmp), | |
1283 | line, | |
1284 | column, | |
1285 | filename), | |
1286 | SCM_UNDEFINED)); | |
1287 | copy = SCM_CDR (copy); | |
1288 | } | |
1289 | SCM_SETCDR (copy, tmp); | |
1290 | } | |
1291 | else | |
1292 | { | |
1293 | recsexpr (SCM_CAR (obj), line, column, filename); | |
1294 | while ((tmp = SCM_CDR (tmp)) && scm_is_pair (tmp)) | |
1295 | recsexpr (SCM_CAR (tmp), line, column, filename); | |
1296 | copy = SCM_UNDEFINED; | |
1297 | } | |
1298 | scm_whash_insert (scm_source_whash, | |
1299 | obj, | |
1300 | scm_make_srcprops (line, | |
1301 | column, | |
1302 | filename, | |
1303 | copy, | |
1304 | SCM_EOL)); | |
1305 | } | |
1306 | return obj; | |
1307 | } | |
1308 | } | |
1309 | ||
14de3b42 GH |
1310 | /* Manipulate the read-hash-procedures alist. This could be written in |
1311 | Scheme, but maybe it will also be used by C code during initialisation. */ | |
a1ec6916 | 1312 | SCM_DEFINE (scm_read_hash_extend, "read-hash-extend", 2, 0, 0, |
1bbd0b84 | 1313 | (SCM chr, SCM proc), |
dc7fa443 MG |
1314 | "Install the procedure @var{proc} for reading expressions\n" |
1315 | "starting with the character sequence @code{#} and @var{chr}.\n" | |
1316 | "@var{proc} will be called with two arguments: the character\n" | |
1317 | "@var{chr} and the port to read further data from. The object\n" | |
391f57e6 HWN |
1318 | "returned will be the return value of @code{read}. \n" |
1319 | "Passing @code{#f} for @var{proc} will remove a previous setting. \n" | |
1320 | ) | |
1bbd0b84 | 1321 | #define FUNC_NAME s_scm_read_hash_extend |
deca31e1 | 1322 | { |
fed9c9a2 GH |
1323 | SCM this; |
1324 | SCM prev; | |
1325 | ||
36284627 | 1326 | SCM_VALIDATE_CHAR (1, chr); |
7888309b | 1327 | SCM_ASSERT (scm_is_false (proc) |
bc36d050 | 1328 | || scm_is_eq (scm_procedure_p (proc), SCM_BOOL_T), |
36284627 | 1329 | proc, SCM_ARG2, FUNC_NAME); |
fed9c9a2 | 1330 | |
14de3b42 GH |
1331 | /* Check if chr is already in the alist. */ |
1332 | this = *scm_read_hash_procedures; | |
1333 | prev = SCM_BOOL_F; | |
fed9c9a2 GH |
1334 | while (1) |
1335 | { | |
d2e53ed6 | 1336 | if (scm_is_null (this)) |
fed9c9a2 GH |
1337 | { |
1338 | /* not found, so add it to the beginning. */ | |
7888309b | 1339 | if (scm_is_true (proc)) |
fed9c9a2 | 1340 | { |
14de3b42 GH |
1341 | *scm_read_hash_procedures = |
1342 | scm_cons (scm_cons (chr, proc), *scm_read_hash_procedures); | |
fed9c9a2 GH |
1343 | } |
1344 | break; | |
1345 | } | |
bc36d050 | 1346 | if (scm_is_eq (chr, SCM_CAAR (this))) |
fed9c9a2 GH |
1347 | { |
1348 | /* already in the alist. */ | |
7888309b | 1349 | if (scm_is_false (proc)) |
14de3b42 GH |
1350 | { |
1351 | /* remove it. */ | |
7888309b | 1352 | if (scm_is_false (prev)) |
14de3b42 GH |
1353 | { |
1354 | *scm_read_hash_procedures = | |
1355 | SCM_CDR (*scm_read_hash_procedures); | |
1356 | } | |
1357 | else | |
1358 | scm_set_cdr_x (prev, SCM_CDR (this)); | |
1359 | } | |
fed9c9a2 | 1360 | else |
14de3b42 GH |
1361 | { |
1362 | /* replace it. */ | |
1363 | scm_set_cdr_x (SCM_CAR (this), proc); | |
1364 | } | |
fed9c9a2 GH |
1365 | break; |
1366 | } | |
1367 | prev = this; | |
1368 | this = SCM_CDR (this); | |
1369 | } | |
deca31e1 | 1370 | |
deca31e1 GH |
1371 | return SCM_UNSPECIFIED; |
1372 | } | |
1bbd0b84 | 1373 | #undef FUNC_NAME |
0f2d19dd | 1374 | |
deca31e1 GH |
1375 | /* Recover the read-hash procedure corresponding to char c. */ |
1376 | static SCM | |
6e8d25a6 | 1377 | scm_get_hash_procedure (int c) |
deca31e1 | 1378 | { |
14de3b42 | 1379 | SCM rest = *scm_read_hash_procedures; |
fed9c9a2 | 1380 | |
deca31e1 GH |
1381 | while (1) |
1382 | { | |
d2e53ed6 | 1383 | if (scm_is_null (rest)) |
deca31e1 GH |
1384 | return SCM_BOOL_F; |
1385 | ||
7866a09b | 1386 | if (SCM_CHAR (SCM_CAAR (rest)) == c) |
deca31e1 GH |
1387 | return SCM_CDAR (rest); |
1388 | ||
1389 | rest = SCM_CDR (rest); | |
1390 | } | |
1391 | } | |
1cc91f1b | 1392 | |
889975e5 MG |
1393 | #define SCM_ENCODING_SEARCH_SIZE (500) |
1394 | ||
1395 | /* Search the first few hundred characters of a file for | |
1396 | an emacs-like coding declaration. */ | |
1397 | char * | |
1398 | scm_scan_for_encoding (SCM port) | |
1399 | { | |
1400 | char header[SCM_ENCODING_SEARCH_SIZE+1]; | |
1401 | size_t bytes_read; | |
1402 | char *encoding = NULL; | |
1403 | int utf8_bom = 0; | |
1404 | char *pos; | |
1405 | int i; | |
1406 | int in_comment; | |
1407 | ||
1408 | bytes_read = scm_c_read (port, header, SCM_ENCODING_SEARCH_SIZE); | |
1409 | scm_seek (port, scm_from_int (0), scm_from_int (SEEK_SET)); | |
1410 | ||
1411 | if (bytes_read > 3 | |
1412 | && header[0] == '\xef' && header[1] == '\xbb' && header[2] == '\xbf') | |
1413 | utf8_bom = 1; | |
1414 | ||
1415 | /* search past "coding[:=]" */ | |
1416 | pos = header; | |
1417 | while (1) | |
1418 | { | |
1419 | if ((pos = strstr(pos, "coding")) == NULL) | |
1420 | return NULL; | |
1421 | ||
1422 | pos += strlen("coding"); | |
1423 | if (pos - header >= SCM_ENCODING_SEARCH_SIZE || | |
1424 | (*pos == ':' || *pos == '=')) | |
1425 | { | |
1426 | pos ++; | |
1427 | break; | |
1428 | } | |
1429 | } | |
1430 | ||
1431 | /* skip spaces */ | |
1432 | while (pos - header <= SCM_ENCODING_SEARCH_SIZE && | |
1433 | (*pos == ' ' || *pos == '\t')) | |
1434 | pos ++; | |
1435 | ||
1436 | /* grab the next token */ | |
1437 | i = 0; | |
1438 | while (pos + i - header <= SCM_ENCODING_SEARCH_SIZE | |
1439 | && (isalnum(pos[i]) || pos[i] == '_' || pos[i] == '-' || pos[i] == '.')) | |
1440 | i++; | |
1441 | ||
1442 | if (i == 0) | |
1443 | return NULL; | |
1444 | ||
1445 | encoding = scm_malloc (i+1); | |
1446 | memcpy (encoding, pos, i); | |
1447 | encoding[i] ='\0'; | |
1448 | for (i = 0; i < strlen(encoding); i++) | |
1449 | encoding[i] = toupper(encoding[i]); | |
1450 | ||
1451 | /* push backwards to make sure we were in a comment */ | |
1452 | in_comment = 0; | |
1453 | while (pos - i - header > 0) | |
1454 | { | |
1455 | if (*(pos - i) == '\n') | |
1456 | { | |
1457 | /* This wasn't in a semicolon comment. Check for a | |
1458 | hash-bang comment. */ | |
1459 | char *beg = strstr (header, "#!"); | |
1460 | char *end = strstr (header, "!#"); | |
1461 | if (beg < pos && pos < end) | |
1462 | in_comment = 1; | |
1463 | break; | |
1464 | } | |
1465 | if (*(pos - i) == ';') | |
1466 | { | |
1467 | in_comment = 1; | |
1468 | break; | |
1469 | } | |
1470 | i ++; | |
1471 | } | |
1472 | if (!in_comment) | |
1473 | { | |
1474 | /* This wasn't in a comment */ | |
1475 | free (encoding); | |
1476 | return NULL; | |
1477 | } | |
1478 | if (utf8_bom && strcmp(encoding, "UTF-8")) | |
1479 | scm_misc_error (NULL, | |
1480 | "the port input declares the encoding ~s but is encoded as UTF-8", | |
1481 | scm_list_1 (scm_from_locale_string (encoding))); | |
1482 | ||
1483 | return encoding; | |
1484 | } | |
1485 | ||
1486 | SCM_DEFINE (scm_file_encoding, "file-encoding", 1, 0, 0, | |
1487 | (SCM port), | |
1488 | "Scans the port for an EMACS-like character coding declaration\n" | |
1489 | "near the top of the contents of a port with random-acessible contents.\n" | |
1490 | "The coding declaration is of the form\n" | |
1491 | "@code{coding: XXXXX} and must appear in a scheme comment.\n" | |
1492 | "\n" | |
1493 | "Returns a string containing the character encoding of the file\n" | |
1494 | "if a declaration was found, or @code{#f} otherwise.\n") | |
1495 | #define FUNC_NAME s_scm_file_encoding | |
1496 | { | |
1497 | char *enc; | |
1498 | SCM s_enc; | |
1499 | ||
1500 | enc = scm_scan_for_encoding (port); | |
1501 | if (enc == NULL) | |
1502 | return SCM_BOOL_F; | |
1503 | else | |
1504 | { | |
1505 | s_enc = scm_from_locale_string (enc); | |
1506 | free (enc); | |
1507 | return s_enc; | |
1508 | } | |
1509 | ||
1510 | return SCM_BOOL_F; | |
1511 | } | |
1512 | #undef FUNC_NAME | |
1513 | ||
0f2d19dd JB |
1514 | void |
1515 | scm_init_read () | |
0f2d19dd | 1516 | { |
14de3b42 | 1517 | scm_read_hash_procedures = |
86d31dfe | 1518 | SCM_VARIABLE_LOC (scm_c_define ("read-hash-procedures", SCM_EOL)); |
fed9c9a2 | 1519 | |
62560650 | 1520 | scm_init_opts (scm_read_options, scm_read_opts); |
a0599745 | 1521 | #include "libguile/read.x" |
0f2d19dd | 1522 | } |
89e00824 ML |
1523 | |
1524 | /* | |
1525 | Local Variables: | |
1526 | c-file-style: "gnu" | |
1527 | End: | |
1528 | */ |