Commit | Line | Data |
---|---|---|
b3aa4626 | 1 | /* Copyright (C) 1995,1996,1997,1999,2000,2001,2003, 2004, 2006, 2007 Free Software |
dd72382c | 2 | * Foundation, Inc. |
0f2d19dd | 3 | * |
73be1d9e MV |
4 | * This library is free software; you can redistribute it and/or |
5 | * modify it under the terms of the GNU Lesser General Public | |
6 | * License as published by the Free Software Foundation; either | |
7 | * version 2.1 of the License, or (at your option) any later version. | |
0f2d19dd | 8 | * |
73be1d9e MV |
9 | * This library is distributed in the hope that it will be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
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 | |
92205699 | 16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
73be1d9e | 17 | */ |
1bbd0b84 | 18 | |
1bbd0b84 | 19 | |
0f2d19dd JB |
20 | \f |
21 | ||
7337d56d LC |
22 | #ifdef HAVE_CONFIG_H |
23 | # include <config.h> | |
24 | #endif | |
25 | ||
0f2d19dd | 26 | #include <stdio.h> |
7337d56d LC |
27 | #include <ctype.h> |
28 | #include <string.h> | |
7337d56d | 29 | |
a0599745 MD |
30 | #include "libguile/_scm.h" |
31 | #include "libguile/chars.h" | |
32 | #include "libguile/eval.h" | |
33 | #include "libguile/unif.h" | |
34 | #include "libguile/keywords.h" | |
35 | #include "libguile/alist.h" | |
36 | #include "libguile/srcprop.h" | |
37 | #include "libguile/hashtab.h" | |
38 | #include "libguile/hash.h" | |
39 | #include "libguile/ports.h" | |
40 | #include "libguile/root.h" | |
41 | #include "libguile/strings.h" | |
ba1b2226 | 42 | #include "libguile/strports.h" |
a0599745 | 43 | #include "libguile/vectors.h" |
a0599745 | 44 | #include "libguile/validate.h" |
a4022e69 | 45 | #include "libguile/srfi-4.h" |
7337d56d | 46 | #include "libguile/srfi-13.h" |
ba1b2226 | 47 | |
a0599745 | 48 | #include "libguile/read.h" |
22fc179a HWN |
49 | #include "libguile/private-options.h" |
50 | ||
0f2d19dd JB |
51 | |
52 | \f | |
53 | ||
5bf6a6f0 | 54 | SCM_GLOBAL_SYMBOL (scm_sym_dot, "."); |
c7733771 GH |
55 | SCM_SYMBOL (scm_keyword_prefix, "prefix"); |
56 | ||
92c2555f | 57 | scm_t_option scm_read_opts[] = { |
b7ff98dd MD |
58 | { SCM_OPTION_BOOLEAN, "copy", 0, |
59 | "Copy source code expressions." }, | |
ac74fc22 | 60 | { SCM_OPTION_BOOLEAN, "positions", 0, |
deca31e1 GH |
61 | "Record positions of source code expressions." }, |
62 | { SCM_OPTION_BOOLEAN, "case-insensitive", 0, | |
c7733771 | 63 | "Convert symbols to lower case."}, |
f1267706 | 64 | { SCM_OPTION_SCM, "keywords", SCM_UNPACK (SCM_BOOL_F), |
62560650 | 65 | "Style of keyword recognition: #f or 'prefix."}, |
16353acc | 66 | #if SCM_ENABLE_ELISP |
16353acc NJ |
67 | { SCM_OPTION_BOOLEAN, "elisp-vectors", 0, |
68 | "Support Elisp vector syntax, namely `[...]'."}, | |
cd21f5eb | 69 | { SCM_OPTION_BOOLEAN, "elisp-strings", 0, |
62560650 | 70 | "Support `\\(' and `\\)' in strings."}, |
16353acc | 71 | #endif |
62560650 | 72 | { 0, }, |
a16f6fe7 MD |
73 | }; |
74 | ||
39e8f371 HWN |
75 | /* |
76 | Give meaningful error messages for errors | |
77 | ||
78 | We use the format | |
79 | ||
ba1b2226 | 80 | FILE:LINE:COL: MESSAGE |
39e8f371 HWN |
81 | This happened in .... |
82 | ||
83 | This is not standard GNU format, but the test-suite likes the real | |
84 | message to be in front. | |
85 | ||
39e8f371 HWN |
86 | */ |
87 | ||
88 | ||
a4022e69 MV |
89 | void |
90 | scm_i_input_error (char const *function, | |
91 | SCM port, const char *message, SCM arg) | |
ba1b2226 | 92 | { |
29a837fd MV |
93 | SCM fn = (scm_is_string (SCM_FILENAME(port)) |
94 | ? SCM_FILENAME(port) | |
95 | : scm_from_locale_string ("#<unknown port>")); | |
ba1b2226 | 96 | |
29a837fd | 97 | SCM string_port = scm_open_output_string (); |
ba1b2226 HWN |
98 | SCM string = SCM_EOL; |
99 | scm_simple_format (string_port, | |
272632a6 | 100 | scm_from_locale_string ("~A:~S:~S: ~A"), |
29a837fd | 101 | scm_list_4 (fn, |
b3aa4626 | 102 | scm_from_long (SCM_LINUM (port) + 1), |
b9bd8526 | 103 | scm_from_int (SCM_COL (port) + 1), |
272632a6 | 104 | scm_from_locale_string (message))); |
ba1b2226 HWN |
105 | |
106 | string = scm_get_output_string (string_port); | |
107 | scm_close_output_port (string_port); | |
272632a6 | 108 | scm_error_scm (scm_from_locale_symbol ("read-error"), |
a4022e69 | 109 | function? scm_from_locale_string (function) : SCM_BOOL_F, |
ba1b2226 | 110 | string, |
dd72382c | 111 | arg, |
ba1b2226 HWN |
112 | SCM_BOOL_F); |
113 | } | |
39e8f371 HWN |
114 | |
115 | ||
a1ec6916 | 116 | SCM_DEFINE (scm_read_options, "read-options-interface", 0, 1, 0, |
1bbd0b84 | 117 | (SCM setting), |
dc7fa443 MG |
118 | "Option interface for the read options. Instead of using\n" |
119 | "this procedure directly, use the procedures @code{read-enable},\n" | |
3939e9df | 120 | "@code{read-disable}, @code{read-set!} and @code{read-options}.") |
1bbd0b84 | 121 | #define FUNC_NAME s_scm_read_options |
a16f6fe7 | 122 | { |
b7ff98dd MD |
123 | SCM ans = scm_options (setting, |
124 | scm_read_opts, | |
1bbd0b84 | 125 | FUNC_NAME); |
b7ff98dd MD |
126 | if (SCM_COPY_SOURCE_P) |
127 | SCM_RECORD_POSITIONS_P = 1; | |
a16f6fe7 MD |
128 | return ans; |
129 | } | |
1bbd0b84 | 130 | #undef FUNC_NAME |
a16f6fe7 | 131 | |
14de3b42 GH |
132 | /* An association list mapping extra hash characters to procedures. */ |
133 | static SCM *scm_read_hash_procedures; | |
deca31e1 | 134 | |
0f2d19dd | 135 | |
7337d56d LC |
136 | \f |
137 | /* Token readers. */ | |
0f2d19dd | 138 | |
0f2d19dd | 139 | |
7337d56d LC |
140 | /* Size of the C buffer used to read symbols and numbers. */ |
141 | #define READER_BUFFER_SIZE 128 | |
0f2d19dd | 142 | |
7337d56d LC |
143 | /* Size of the C buffer used to read strings. */ |
144 | #define READER_STRING_BUFFER_SIZE 512 | |
0f2d19dd | 145 | |
7337d56d LC |
146 | /* The maximum size of Scheme character names. */ |
147 | #define READER_CHAR_NAME_MAX_SIZE 50 | |
1cc91f1b | 148 | |
94115ae3 | 149 | |
7337d56d LC |
150 | /* `isblank' is only in C99. */ |
151 | #define CHAR_IS_BLANK_(_chr) \ | |
152 | (((_chr) == ' ') || ((_chr) == '\t') || ((_chr) == '\n') \ | |
d41668fa | 153 | || ((_chr) == '\f') || ((_chr) == '\r')) |
7337d56d LC |
154 | |
155 | #ifdef MSDOS | |
156 | # define CHAR_IS_BLANK(_chr) \ | |
157 | ((CHAR_IS_BLANK_ (chr)) || ((_chr) == 26)) | |
158 | #else | |
159 | # define CHAR_IS_BLANK CHAR_IS_BLANK_ | |
160 | #endif | |
161 | ||
162 | ||
163 | /* R5RS one-character delimiters (see section 7.1.1, ``Lexical | |
164 | structure''). */ | |
165 | #define CHAR_IS_R5RS_DELIMITER(c) \ | |
166 | (CHAR_IS_BLANK (c) \ | |
167 | || (c == ')') || (c == '(') || (c == ';') || (c == '"')) | |
168 | ||
169 | #define CHAR_IS_DELIMITER CHAR_IS_R5RS_DELIMITER | |
170 | ||
171 | /* Exponent markers, as defined in section 7.1.1 of R5RS, ``Lexical | |
172 | Structure''. */ | |
173 | #define CHAR_IS_EXPONENT_MARKER(_chr) \ | |
174 | (((_chr) == 'e') || ((_chr) == 's') || ((_chr) == 'f') \ | |
175 | || ((_chr) == 'd') || ((_chr) == 'l')) | |
176 | ||
177 | /* An inlinable version of `scm_c_downcase ()'. */ | |
178 | #define CHAR_DOWNCASE(_chr) \ | |
179 | (((_chr) <= UCHAR_MAX) ? tolower (_chr) : (_chr)) | |
180 | ||
181 | ||
454866e0 LC |
182 | /* Read an SCSH block comment. */ |
183 | static inline SCM scm_read_scsh_block_comment (int chr, SCM port); | |
184 | ||
d41668fa LC |
185 | /* Read from PORT until a delimiter (e.g., a whitespace) is read. Return |
186 | zero if the whole token fits in BUF, non-zero otherwise. */ | |
7337d56d LC |
187 | static inline int |
188 | read_token (SCM port, char *buf, size_t buf_size, size_t *read) | |
0520c320 | 189 | { |
7337d56d | 190 | *read = 0; |
0520c320 | 191 | |
7337d56d | 192 | while (*read < buf_size) |
0520c320 | 193 | { |
7337d56d | 194 | int chr; |
0520c320 | 195 | |
7337d56d LC |
196 | chr = scm_getc (port); |
197 | chr = (SCM_CASE_INSENSITIVE_P ? CHAR_DOWNCASE (chr) : chr); | |
198 | ||
199 | if (chr == EOF) | |
200 | return 0; | |
201 | else if (CHAR_IS_DELIMITER (chr)) | |
202 | { | |
203 | scm_ungetc (chr, port); | |
204 | return 0; | |
205 | } | |
0520c320 | 206 | else |
7337d56d LC |
207 | { |
208 | *buf = (char) chr; | |
209 | buf++, (*read)++; | |
210 | } | |
0520c320 | 211 | } |
7337d56d LC |
212 | |
213 | return 1; | |
0520c320 | 214 | } |
1cc91f1b | 215 | |
7337d56d LC |
216 | |
217 | /* Skip whitespace from PORT and return the first non-whitespace character | |
218 | read. Raise an error on end-of-file. */ | |
219 | static int | |
220 | flush_ws (SCM port, const char *eoferr) | |
0f2d19dd JB |
221 | { |
222 | register int c; | |
223 | while (1) | |
b7f3516f | 224 | switch (c = scm_getc (port)) |
0f2d19dd JB |
225 | { |
226 | case EOF: | |
227 | goteof: | |
228 | if (eoferr) | |
d156d3b7 | 229 | { |
a4022e69 MV |
230 | scm_i_input_error (eoferr, |
231 | port, | |
232 | "end of file", | |
233 | SCM_EOL); | |
d156d3b7 | 234 | } |
0f2d19dd | 235 | return c; |
7337d56d | 236 | |
0f2d19dd JB |
237 | case ';': |
238 | lp: | |
b7f3516f | 239 | switch (c = scm_getc (port)) |
0f2d19dd JB |
240 | { |
241 | case EOF: | |
242 | goto goteof; | |
243 | default: | |
244 | goto lp; | |
245 | case SCM_LINE_INCREMENTORS: | |
246 | break; | |
247 | } | |
248 | break; | |
7337d56d | 249 | |
454866e0 LC |
250 | case '#': |
251 | switch (c = scm_getc (port)) | |
252 | { | |
253 | case EOF: | |
254 | eoferr = "read_sharp"; | |
255 | goto goteof; | |
256 | case '!': | |
257 | scm_read_scsh_block_comment (c, port); | |
258 | break; | |
259 | default: | |
260 | scm_ungetc (c, port); | |
261 | return '#'; | |
262 | } | |
263 | break; | |
264 | ||
0f2d19dd | 265 | case SCM_LINE_INCREMENTORS: |
0f2d19dd | 266 | case SCM_SINGLE_SPACES: |
0f2d19dd | 267 | case '\t': |
0f2d19dd | 268 | break; |
7337d56d | 269 | |
0f2d19dd JB |
270 | default: |
271 | return c; | |
272 | } | |
7337d56d LC |
273 | |
274 | return 0; | |
0f2d19dd JB |
275 | } |
276 | ||
277 | ||
7337d56d LC |
278 | \f |
279 | /* Token readers. */ | |
1cc91f1b | 280 | |
7337d56d LC |
281 | static SCM scm_read_expression (SCM port); |
282 | static SCM scm_read_sharp (int chr, SCM port); | |
283 | static SCM scm_get_hash_procedure (int c); | |
284 | static SCM recsexpr (SCM obj, long line, int column, SCM filename); | |
0f2d19dd JB |
285 | |
286 | ||
09a4f039 | 287 | static SCM |
7337d56d LC |
288 | scm_read_sexp (int chr, SCM port) |
289 | #define FUNC_NAME "scm_i_lreadparen" | |
09a4f039 | 290 | { |
7337d56d LC |
291 | register int c; |
292 | register SCM tmp; | |
293 | register SCM tl, ans = SCM_EOL; | |
294 | SCM tl2 = SCM_EOL, ans2 = SCM_EOL, copy = SCM_BOOL_F;; | |
295 | static const int terminating_char = ')'; | |
296 | ||
297 | /* Need to capture line and column numbers here. */ | |
298 | long line = SCM_LINUM (port); | |
299 | int column = SCM_COL (port) - 1; | |
f9c68a47 | 300 | |
f9c68a47 | 301 | |
7337d56d LC |
302 | c = flush_ws (port, FUNC_NAME); |
303 | if (terminating_char == c) | |
304 | return SCM_EOL; | |
f9c68a47 | 305 | |
7337d56d LC |
306 | scm_ungetc (c, port); |
307 | if (scm_is_eq (scm_sym_dot, | |
308 | (tmp = scm_read_expression (port)))) | |
309 | { | |
310 | ans = scm_read_expression (port); | |
311 | if (terminating_char != (c = flush_ws (port, FUNC_NAME))) | |
312 | scm_i_input_error (FUNC_NAME, port, "missing close paren", | |
313 | SCM_EOL); | |
314 | return ans; | |
315 | } | |
1cc91f1b | 316 | |
7337d56d LC |
317 | /* Build the head of the list structure. */ |
318 | ans = tl = scm_cons (tmp, SCM_EOL); | |
319 | ||
320 | if (SCM_COPY_SOURCE_P) | |
321 | ans2 = tl2 = scm_cons (scm_is_pair (tmp) | |
322 | ? copy | |
323 | : tmp, | |
324 | SCM_EOL); | |
325 | ||
326 | while (terminating_char != (c = flush_ws (port, FUNC_NAME))) | |
0f2d19dd | 327 | { |
7337d56d | 328 | SCM new_tail; |
0f2d19dd | 329 | |
7337d56d LC |
330 | scm_ungetc (c, port); |
331 | if (scm_is_eq (scm_sym_dot, | |
332 | (tmp = scm_read_expression (port)))) | |
0f2d19dd | 333 | { |
7337d56d LC |
334 | SCM_SETCDR (tl, tmp = scm_read_expression (port)); |
335 | ||
336 | if (SCM_COPY_SOURCE_P) | |
337 | SCM_SETCDR (tl2, scm_cons (scm_is_pair (tmp) ? copy : tmp, | |
338 | SCM_EOL)); | |
339 | ||
340 | c = flush_ws (port, FUNC_NAME); | |
341 | if (terminating_char != c) | |
342 | scm_i_input_error (FUNC_NAME, port, | |
343 | "in pair: missing close paren", SCM_EOL); | |
344 | goto exit; | |
0f2d19dd | 345 | } |
b858464a | 346 | |
7337d56d LC |
347 | new_tail = scm_cons (tmp, SCM_EOL); |
348 | SCM_SETCDR (tl, new_tail); | |
349 | tl = new_tail; | |
350 | ||
351 | if (SCM_COPY_SOURCE_P) | |
0f2d19dd | 352 | { |
7337d56d LC |
353 | SCM new_tail2 = scm_cons (scm_is_pair (tmp) |
354 | ? copy | |
355 | : tmp, SCM_EOL); | |
356 | SCM_SETCDR (tl2, new_tail2); | |
357 | tl2 = new_tail2; | |
358 | } | |
359 | } | |
0f2d19dd | 360 | |
7337d56d LC |
361 | exit: |
362 | if (SCM_RECORD_POSITIONS_P) | |
363 | scm_whash_insert (scm_source_whash, | |
364 | ans, | |
365 | scm_make_srcprops (line, column, | |
366 | SCM_FILENAME (port), | |
367 | SCM_COPY_SOURCE_P | |
368 | ? ans2 | |
369 | : SCM_UNDEFINED, | |
370 | SCM_EOL)); | |
371 | return ans; | |
372 | } | |
373 | #undef FUNC_NAME | |
a4022e69 | 374 | |
7337d56d LC |
375 | static SCM |
376 | scm_read_string (int chr, SCM port) | |
377 | #define FUNC_NAME "scm_lreadr" | |
378 | { | |
379 | /* For strings smaller than C_STR, this function creates only one Scheme | |
380 | object (the string returned). */ | |
0f2d19dd | 381 | |
7337d56d LC |
382 | SCM str = SCM_BOOL_F; |
383 | char c_str[READER_STRING_BUFFER_SIZE]; | |
384 | unsigned c_str_len = 0; | |
385 | int c; | |
eb42ff25 | 386 | |
7337d56d LC |
387 | while ('"' != (c = scm_getc (port))) |
388 | { | |
389 | if (c == EOF) | |
390 | str_eof: scm_i_input_error (FUNC_NAME, port, | |
391 | "end of file in string constant", | |
392 | SCM_EOL); | |
0f2d19dd | 393 | |
7337d56d LC |
394 | if (c_str_len + 1 >= sizeof (c_str)) |
395 | { | |
396 | /* Flush the C buffer onto a Scheme string. */ | |
397 | SCM addy; | |
deca31e1 | 398 | |
7337d56d LC |
399 | if (str == SCM_BOOL_F) |
400 | str = scm_c_make_string (0, SCM_MAKE_CHAR ('X')); | |
0f2d19dd | 401 | |
7337d56d LC |
402 | addy = scm_from_locale_stringn (c_str, c_str_len); |
403 | str = scm_string_append_shared (scm_list_2 (str, addy)); | |
0f2d19dd | 404 | |
7337d56d LC |
405 | c_str_len = 0; |
406 | } | |
0f2d19dd | 407 | |
7337d56d LC |
408 | if (c == '\\') |
409 | switch (c = scm_getc (port)) | |
410 | { | |
411 | case EOF: | |
412 | goto str_eof; | |
413 | case '"': | |
414 | case '\\': | |
415 | break; | |
16353acc | 416 | #if SCM_ENABLE_ELISP |
7337d56d LC |
417 | case '(': |
418 | case ')': | |
419 | if (SCM_ESCAPED_PARENS_P) | |
420 | break; | |
421 | goto bad_escaped; | |
16353acc | 422 | #endif |
7337d56d LC |
423 | case '\n': |
424 | continue; | |
425 | case '0': | |
426 | c = '\0'; | |
427 | break; | |
428 | case 'f': | |
429 | c = '\f'; | |
430 | break; | |
431 | case 'n': | |
432 | c = '\n'; | |
433 | break; | |
434 | case 'r': | |
435 | c = '\r'; | |
436 | break; | |
437 | case 't': | |
438 | c = '\t'; | |
439 | break; | |
440 | case 'a': | |
441 | c = '\007'; | |
442 | break; | |
443 | case 'v': | |
444 | c = '\v'; | |
445 | break; | |
446 | case 'x': | |
3c9a524f | 447 | { |
7337d56d LC |
448 | int a, b; |
449 | a = scm_getc (port); | |
450 | if (a == EOF) goto str_eof; | |
451 | b = scm_getc (port); | |
452 | if (b == EOF) goto str_eof; | |
453 | if ('0' <= a && a <= '9') a -= '0'; | |
454 | else if ('A' <= a && a <= 'F') a = a - 'A' + 10; | |
455 | else if ('a' <= a && a <= 'f') a = a - 'a' + 10; | |
456 | else goto bad_escaped; | |
457 | if ('0' <= b && b <= '9') b -= '0'; | |
458 | else if ('A' <= b && b <= 'F') b = b - 'A' + 10; | |
459 | else if ('a' <= b && b <= 'f') b = b - 'a' + 10; | |
460 | else goto bad_escaped; | |
461 | c = a * 16 + b; | |
462 | break; | |
3c9a524f | 463 | } |
7337d56d LC |
464 | default: |
465 | bad_escaped: | |
466 | scm_i_input_error (FUNC_NAME, port, | |
467 | "illegal character in escape sequence: ~S", | |
468 | scm_list_1 (SCM_MAKE_CHAR (c))); | |
469 | } | |
470 | c_str[c_str_len++] = c; | |
471 | } | |
f13b4400 | 472 | |
7337d56d LC |
473 | if (c_str_len > 0) |
474 | { | |
475 | SCM addy; | |
0f2d19dd | 476 | |
7337d56d LC |
477 | addy = scm_from_locale_stringn (c_str, c_str_len); |
478 | if (str == SCM_BOOL_F) | |
479 | str = addy; | |
480 | else | |
481 | str = scm_string_append_shared (scm_list_2 (str, addy)); | |
0f2d19dd | 482 | } |
7337d56d LC |
483 | else |
484 | str = (str == SCM_BOOL_F) ? scm_nullstr : str; | |
485 | ||
486 | return str; | |
0f2d19dd | 487 | } |
db4b4ca6 DH |
488 | #undef FUNC_NAME |
489 | ||
0f2d19dd | 490 | |
7337d56d LC |
491 | static SCM |
492 | scm_read_number (int chr, SCM port) | |
0f2d19dd | 493 | { |
7337d56d LC |
494 | SCM result, str = SCM_EOL; |
495 | char buffer[READER_BUFFER_SIZE]; | |
496 | size_t read; | |
497 | int overflow = 0; | |
0f2d19dd | 498 | |
7337d56d LC |
499 | scm_ungetc (chr, port); |
500 | do | |
0f2d19dd | 501 | { |
7337d56d LC |
502 | overflow = read_token (port, buffer, sizeof (buffer), &read); |
503 | ||
504 | if ((overflow) || (scm_is_pair (str))) | |
505 | str = scm_cons (scm_from_locale_stringn (buffer, read), str); | |
0f2d19dd | 506 | } |
7337d56d | 507 | while (overflow); |
0f2d19dd | 508 | |
7337d56d | 509 | if (scm_is_pair (str)) |
0f2d19dd | 510 | { |
7337d56d | 511 | /* The slow path. */ |
0f2d19dd | 512 | |
7337d56d LC |
513 | str = scm_string_concatenate (scm_reverse_x (str, SCM_EOL)); |
514 | result = scm_string_to_number (str, SCM_UNDEFINED); | |
515 | if (!scm_is_true (result)) | |
516 | /* Return a symbol instead of a number. */ | |
517 | result = scm_string_to_symbol (str); | |
518 | } | |
519 | else | |
520 | { | |
521 | result = scm_c_locale_stringn_to_number (buffer, read, 10); | |
522 | if (!scm_is_true (result)) | |
523 | /* Return a symbol instead of a number. */ | |
524 | result = scm_from_locale_symboln (buffer, read); | |
525 | } | |
0f2d19dd | 526 | |
7337d56d LC |
527 | return result; |
528 | } | |
0f2d19dd | 529 | |
7337d56d LC |
530 | static SCM |
531 | scm_read_mixed_case_symbol (int chr, SCM port) | |
532 | { | |
533 | SCM result, str = SCM_EOL; | |
534 | int overflow = 0; | |
535 | char buffer[READER_BUFFER_SIZE]; | |
536 | size_t read = 0; | |
537 | ||
538 | scm_ungetc (chr, port); | |
539 | do | |
540 | { | |
541 | overflow = read_token (port, buffer, sizeof (buffer), &read); | |
542 | ||
543 | if ((overflow) || (scm_is_pair (str))) | |
544 | str = scm_cons (scm_from_locale_stringn (buffer, read), str); | |
545 | } | |
546 | while (overflow); | |
547 | ||
548 | if (scm_is_pair (str)) | |
549 | { | |
550 | str = scm_string_concatenate (scm_reverse_x (str, SCM_EOL)); | |
551 | result = scm_string_to_symbol (str); | |
552 | } | |
553 | else | |
554 | /* For symbols smaller than `sizeof (buffer)', we don't need to recur to | |
555 | Scheme strings. Therefore, we only create one Scheme object (a | |
556 | symbol) per symbol read. */ | |
557 | result = scm_from_locale_symboln (buffer, read); | |
558 | ||
559 | return result; | |
560 | } | |
561 | ||
562 | static SCM | |
563 | scm_read_number_and_radix (int chr, SCM port) | |
564 | #define FUNC_NAME "scm_lreadr" | |
565 | { | |
566 | SCM result, str = SCM_EOL; | |
567 | size_t read; | |
568 | char buffer[READER_BUFFER_SIZE]; | |
569 | unsigned int radix; | |
570 | int overflow = 0; | |
571 | ||
572 | switch (chr) | |
573 | { | |
574 | case 'B': | |
575 | case 'b': | |
576 | radix = 2; | |
577 | break; | |
578 | ||
579 | case 'o': | |
580 | case 'O': | |
581 | radix = 8; | |
582 | break; | |
583 | ||
584 | case 'd': | |
585 | case 'D': | |
586 | radix = 10; | |
587 | break; | |
588 | ||
589 | case 'x': | |
590 | case 'X': | |
591 | radix = 16; | |
592 | break; | |
593 | ||
594 | default: | |
595 | scm_ungetc (chr, port); | |
596 | scm_ungetc ('#', port); | |
597 | radix = 10; | |
598 | } | |
599 | ||
600 | do | |
601 | { | |
602 | overflow = read_token (port, buffer, sizeof (buffer), &read); | |
603 | ||
604 | if ((overflow) || (scm_is_pair (str))) | |
605 | str = scm_cons (scm_from_locale_stringn (buffer, read), str); | |
606 | } | |
607 | while (overflow); | |
608 | ||
609 | if (scm_is_pair (str)) | |
610 | { | |
611 | str = scm_string_concatenate (scm_reverse_x (str, SCM_EOL)); | |
612 | result = scm_string_to_number (str, scm_from_uint (radix)); | |
613 | } | |
614 | else | |
615 | result = scm_c_locale_stringn_to_number (buffer, read, radix); | |
616 | ||
617 | if (scm_is_true (result)) | |
618 | return result; | |
619 | ||
620 | scm_i_input_error (FUNC_NAME, port, "unknown # object", SCM_EOL); | |
621 | ||
622 | return SCM_BOOL_F; | |
623 | } | |
624 | #undef FUNC_NAME | |
625 | ||
626 | static SCM | |
627 | scm_read_quote (int chr, SCM port) | |
628 | { | |
629 | SCM p; | |
492faee1 LC |
630 | long line = SCM_LINUM (port); |
631 | int column = SCM_COL (port) - 1; | |
7337d56d LC |
632 | |
633 | switch (chr) | |
634 | { | |
635 | case '`': | |
636 | p = scm_sym_quasiquote; | |
637 | break; | |
638 | ||
639 | case '\'': | |
640 | p = scm_sym_quote; | |
641 | break; | |
642 | ||
643 | case ',': | |
644 | { | |
645 | int c; | |
646 | ||
647 | c = scm_getc (port); | |
648 | if ('@' == c) | |
649 | p = scm_sym_uq_splicing; | |
650 | else | |
0f2d19dd | 651 | { |
7337d56d LC |
652 | scm_ungetc (c, port); |
653 | p = scm_sym_unquote; | |
0f2d19dd | 654 | } |
7337d56d LC |
655 | break; |
656 | } | |
0f2d19dd | 657 | |
7337d56d LC |
658 | default: |
659 | fprintf (stderr, "%s: unhandled quote character (%i)\n", | |
660 | __FUNCTION__, chr); | |
661 | abort (); | |
0f2d19dd | 662 | } |
1cc91f1b | 663 | |
7337d56d | 664 | p = scm_cons2 (p, scm_read_expression (port), SCM_EOL); |
492faee1 LC |
665 | if (SCM_RECORD_POSITIONS_P) |
666 | scm_whash_insert (scm_source_whash, p, | |
667 | scm_make_srcprops (line, column, | |
668 | SCM_FILENAME (port), | |
669 | SCM_COPY_SOURCE_P | |
670 | ? (scm_cons2 (SCM_CAR (p), | |
671 | SCM_CAR (SCM_CDR (p)), | |
672 | SCM_EOL)) | |
673 | : SCM_UNDEFINED, | |
674 | SCM_EOL)); | |
675 | ||
0f2d19dd | 676 | |
7337d56d LC |
677 | return p; |
678 | } | |
679 | ||
680 | static inline SCM | |
681 | scm_read_semicolon_comment (int chr, SCM port) | |
0f2d19dd | 682 | { |
0f2d19dd JB |
683 | int c; |
684 | ||
7337d56d LC |
685 | for (c = scm_getc (port); |
686 | (c != EOF) && (c != '\n'); | |
687 | c = scm_getc (port)); | |
688 | ||
689 | return SCM_UNSPECIFIED; | |
690 | } | |
691 | ||
692 | \f | |
693 | /* Sharp readers, i.e. readers called after a `#' sign has been read. */ | |
694 | ||
695 | static SCM | |
696 | scm_read_boolean (int chr, SCM port) | |
697 | { | |
698 | switch (chr) | |
0f2d19dd | 699 | { |
7337d56d LC |
700 | case 't': |
701 | case 'T': | |
702 | return SCM_BOOL_T; | |
703 | ||
704 | case 'f': | |
705 | case 'F': | |
706 | return SCM_BOOL_F; | |
0f2d19dd | 707 | } |
7337d56d LC |
708 | |
709 | return SCM_UNSPECIFIED; | |
710 | } | |
711 | ||
712 | static SCM | |
713 | scm_read_character (int chr, SCM port) | |
714 | #define FUNC_NAME "scm_lreadr" | |
715 | { | |
716 | unsigned c; | |
717 | char charname[READER_CHAR_NAME_MAX_SIZE]; | |
718 | size_t charname_len; | |
719 | ||
720 | if (read_token (port, charname, sizeof (charname), &charname_len)) | |
721 | goto char_error; | |
722 | ||
723 | if (charname_len == 0) | |
0f2d19dd | 724 | { |
7337d56d LC |
725 | chr = scm_getc (port); |
726 | if (chr == EOF) | |
727 | scm_i_input_error (FUNC_NAME, port, "unexpected end of file " | |
728 | "while reading character", SCM_EOL); | |
729 | ||
730 | /* CHR must be a token delimiter, like a whitespace. */ | |
731 | return (SCM_MAKE_CHAR (chr)); | |
0f2d19dd | 732 | } |
7337d56d LC |
733 | |
734 | if (charname_len == 1) | |
735 | return SCM_MAKE_CHAR (charname[0]); | |
736 | ||
737 | if (*charname >= '0' && *charname < '8') | |
738 | { | |
739 | /* Dirk:FIXME:: This type of character syntax is not R5RS | |
740 | * compliant. Further, it should be verified that the constant | |
741 | * does only consist of octal digits. Finally, it should be | |
742 | * checked whether the resulting fixnum is in the range of | |
743 | * characters. */ | |
744 | SCM p = scm_c_locale_stringn_to_number (charname, charname_len, 8); | |
745 | if (SCM_I_INUMP (p)) | |
746 | return SCM_MAKE_CHAR (SCM_I_INUM (p)); | |
747 | } | |
748 | ||
749 | for (c = 0; c < scm_n_charnames; c++) | |
750 | if (scm_charnames[c] | |
751 | && (!strncasecmp (scm_charnames[c], charname, charname_len))) | |
752 | return SCM_MAKE_CHAR (scm_charnums[c]); | |
753 | ||
754 | char_error: | |
755 | scm_i_input_error (FUNC_NAME, port, "unknown character name ~a", | |
756 | scm_list_1 (scm_from_locale_stringn (charname, | |
757 | charname_len))); | |
758 | ||
759 | return SCM_UNSPECIFIED; | |
0f2d19dd | 760 | } |
db4b4ca6 | 761 | #undef FUNC_NAME |
0f2d19dd | 762 | |
7337d56d LC |
763 | static inline SCM |
764 | scm_read_keyword (int chr, SCM port) | |
765 | { | |
766 | SCM symbol; | |
767 | ||
768 | /* Read the symbol that comprises the keyword. Doing this instead of | |
769 | invoking a specific symbol reader function allows `scm_read_keyword ()' | |
770 | to adapt to the delimiters currently valid of symbols. | |
1cc91f1b | 771 | |
7337d56d LC |
772 | XXX: This implementation allows sloppy syntaxes like `#: key'. */ |
773 | symbol = scm_read_expression (port); | |
774 | if (!scm_is_symbol (symbol)) | |
775 | scm_i_input_error (__FUNCTION__, port, | |
776 | "keyword prefix `~a' not followed by a symbol: ~s", | |
777 | scm_list_2 (SCM_MAKE_CHAR (chr), symbol)); | |
778 | ||
779 | return (scm_symbol_to_keyword (symbol)); | |
780 | } | |
781 | ||
782 | static inline SCM | |
783 | scm_read_vector (int chr, SCM port) | |
09a4f039 | 784 | { |
7337d56d LC |
785 | /* Note: We call `scm_read_sexp ()' rather than READER here in order to |
786 | guarantee that it's going to do what we want. After all, this is an | |
787 | implementation detail of `scm_read_vector ()', not a desirable | |
788 | property. */ | |
789 | return (scm_vector (scm_read_sexp (chr, port))); | |
790 | } | |
09a4f039 | 791 | |
7337d56d LC |
792 | static inline SCM |
793 | scm_read_srfi4_vector (int chr, SCM port) | |
794 | { | |
795 | return scm_i_read_array (port, chr); | |
796 | } | |
797 | ||
798 | static SCM | |
799 | scm_read_guile_bit_vector (int chr, SCM port) | |
800 | { | |
801 | /* Read the `#*10101'-style read syntax for bit vectors in Guile. This is | |
802 | terribly inefficient but who cares? */ | |
803 | SCM s_bits = SCM_EOL; | |
804 | ||
805 | for (chr = scm_getc (port); | |
806 | (chr != EOF) && ((chr == '0') || (chr == '1')); | |
807 | chr = scm_getc (port)) | |
09a4f039 | 808 | { |
7337d56d | 809 | s_bits = scm_cons ((chr == '0') ? SCM_BOOL_F : SCM_BOOL_T, s_bits); |
09a4f039 | 810 | } |
7337d56d LC |
811 | |
812 | if (chr != EOF) | |
813 | scm_ungetc (chr, port); | |
814 | ||
815 | return scm_bitvector (scm_reverse_x (s_bits, SCM_EOL)); | |
816 | } | |
817 | ||
818 | static inline SCM | |
819 | scm_read_scsh_block_comment (int chr, SCM port) | |
820 | { | |
821 | int bang_seen = 0; | |
822 | ||
823 | for (;;) | |
09a4f039 | 824 | { |
7337d56d | 825 | int c = scm_getc (port); |
62850ef3 | 826 | |
7337d56d LC |
827 | if (c == EOF) |
828 | scm_i_input_error ("skip_block_comment", port, | |
829 | "unterminated `#! ... !#' comment", SCM_EOL); | |
830 | ||
831 | if (c == '!') | |
832 | bang_seen = 1; | |
833 | else if (c == '#' && bang_seen) | |
834 | break; | |
835 | else | |
836 | bang_seen = 0; | |
837 | } | |
838 | ||
839 | return SCM_UNSPECIFIED; | |
840 | } | |
841 | ||
842 | static SCM | |
843 | scm_read_extended_symbol (int chr, SCM port) | |
844 | { | |
845 | /* Guile's extended symbol read syntax looks like this: | |
846 | ||
847 | #{This is all a symbol name}# | |
848 | ||
849 | So here, CHR is expected to be `{'. */ | |
850 | SCM result; | |
851 | int saw_brace = 0, finished = 0; | |
852 | size_t len = 0; | |
853 | char buf[1024]; | |
854 | ||
855 | result = scm_c_make_string (0, SCM_MAKE_CHAR ('X')); | |
856 | ||
857 | while ((chr = scm_getc (port)) != EOF) | |
858 | { | |
859 | if (saw_brace) | |
09a4f039 | 860 | { |
7337d56d LC |
861 | if (chr == '#') |
862 | { | |
863 | finished = 1; | |
864 | break; | |
865 | } | |
866 | else | |
867 | { | |
868 | saw_brace = 0; | |
869 | buf[len++] = '}'; | |
870 | buf[len++] = chr; | |
871 | } | |
09a4f039 | 872 | } |
7337d56d LC |
873 | else if (chr == '}') |
874 | saw_brace = 1; | |
875 | else | |
876 | buf[len++] = chr; | |
62850ef3 | 877 | |
7337d56d LC |
878 | if (len >= sizeof (buf) - 2) |
879 | { | |
880 | scm_string_append (scm_list_2 (result, | |
881 | scm_from_locale_stringn (buf, len))); | |
882 | len = 0; | |
883 | } | |
62850ef3 | 884 | |
7337d56d LC |
885 | if (finished) |
886 | break; | |
887 | } | |
888 | ||
889 | if (len) | |
890 | result = scm_string_append (scm_list_2 | |
891 | (result, | |
892 | scm_from_locale_stringn (buf, len))); | |
893 | ||
894 | return (scm_string_to_symbol (result)); | |
895 | } | |
896 | ||
897 | ||
898 | \f | |
899 | /* Top-level token readers, i.e., dispatchers. */ | |
900 | ||
901 | static SCM | |
902 | scm_read_sharp_extension (int chr, SCM port) | |
903 | { | |
904 | SCM proc; | |
905 | ||
906 | proc = scm_get_hash_procedure (chr); | |
907 | if (scm_is_true (scm_procedure_p (proc))) | |
908 | { | |
909 | long line = SCM_LINUM (port); | |
910 | int column = SCM_COL (port) - 2; | |
911 | SCM got; | |
912 | ||
913 | got = scm_call_2 (proc, SCM_MAKE_CHAR (chr), port); | |
914 | if (!scm_is_eq (got, SCM_UNSPECIFIED)) | |
62850ef3 | 915 | { |
7337d56d LC |
916 | if (SCM_RECORD_POSITIONS_P) |
917 | return (recsexpr (got, line, column, | |
918 | SCM_FILENAME (port))); | |
919 | else | |
920 | return got; | |
62850ef3 | 921 | } |
09a4f039 | 922 | } |
7337d56d LC |
923 | |
924 | return SCM_UNSPECIFIED; | |
925 | } | |
926 | ||
927 | /* The reader for the sharp `#' character. It basically dispatches reads | |
928 | among the above token readers. */ | |
929 | static SCM | |
930 | scm_read_sharp (int chr, SCM port) | |
931 | #define FUNC_NAME "scm_lreadr" | |
932 | { | |
933 | SCM result; | |
934 | ||
935 | chr = scm_getc (port); | |
936 | ||
937 | result = scm_read_sharp_extension (chr, port); | |
938 | if (!scm_is_eq (result, SCM_UNSPECIFIED)) | |
939 | return result; | |
940 | ||
941 | switch (chr) | |
942 | { | |
943 | case '\\': | |
944 | return (scm_read_character (chr, port)); | |
945 | case '(': | |
946 | return (scm_read_vector (chr, port)); | |
947 | case 's': | |
948 | case 'u': | |
949 | case 'f': | |
950 | /* This one may return either a boolean or an SRFI-4 vector. */ | |
951 | return (scm_read_srfi4_vector (chr, port)); | |
952 | case '*': | |
953 | return (scm_read_guile_bit_vector (chr, port)); | |
954 | case 't': | |
955 | case 'T': | |
956 | case 'F': | |
957 | /* This one may return either a boolean or an SRFI-4 vector. */ | |
958 | return (scm_read_boolean (chr, port)); | |
959 | case ':': | |
960 | return (scm_read_keyword (chr, port)); | |
961 | case '0': case '1': case '2': case '3': case '4': | |
962 | case '5': case '6': case '7': case '8': case '9': | |
963 | case '@': | |
964 | #if SCM_ENABLE_DEPRECATED | |
965 | /* See below for 'i' and 'e'. */ | |
966 | case 'a': | |
967 | case 'c': | |
968 | case 'y': | |
969 | case 'h': | |
970 | case 'l': | |
971 | #endif | |
972 | return (scm_i_read_array (port, chr)); | |
973 | ||
974 | case 'i': | |
975 | case 'e': | |
976 | #if SCM_ENABLE_DEPRECATED | |
977 | { | |
978 | /* When next char is '(', it really is an old-style | |
979 | uniform array. */ | |
980 | int next_c = scm_getc (port); | |
981 | if (next_c != EOF) | |
982 | scm_ungetc (next_c, port); | |
983 | if (next_c == '(') | |
984 | return scm_i_read_array (port, chr); | |
985 | /* Fall through. */ | |
986 | } | |
987 | #endif | |
988 | case 'b': | |
989 | case 'B': | |
990 | case 'o': | |
991 | case 'O': | |
992 | case 'd': | |
993 | case 'D': | |
994 | case 'x': | |
995 | case 'X': | |
996 | case 'I': | |
997 | case 'E': | |
998 | return (scm_read_number_and_radix (chr, port)); | |
999 | case '{': | |
1000 | return (scm_read_extended_symbol (chr, port)); | |
1001 | case '!': | |
1002 | return (scm_read_scsh_block_comment (chr, port)); | |
1003 | default: | |
1004 | result = scm_read_sharp_extension (chr, port); | |
1005 | if (scm_is_eq (result, SCM_UNSPECIFIED)) | |
1006 | scm_i_input_error (FUNC_NAME, port, "Unknown # object: ~S", | |
1007 | scm_list_1 (SCM_MAKE_CHAR (chr))); | |
1008 | else | |
1009 | return result; | |
1010 | } | |
1011 | ||
1012 | return SCM_UNSPECIFIED; | |
1013 | } | |
1014 | #undef FUNC_NAME | |
1015 | ||
1016 | static SCM | |
1017 | scm_read_expression (SCM port) | |
1018 | #define FUNC_NAME "scm_read_expression" | |
1019 | { | |
1020 | while (1) | |
1021 | { | |
1022 | register int chr; | |
1023 | ||
1024 | chr = scm_getc (port); | |
1025 | ||
1026 | switch (chr) | |
1027 | { | |
1028 | case SCM_WHITE_SPACES: | |
1029 | case SCM_LINE_INCREMENTORS: | |
1030 | break; | |
1031 | case ';': | |
1032 | (void) scm_read_semicolon_comment (chr, port); | |
1033 | break; | |
1034 | case '(': | |
1035 | return (scm_read_sexp (chr, port)); | |
1036 | case '"': | |
1037 | return (scm_read_string (chr, port)); | |
1038 | case '\'': | |
1039 | case '`': | |
1040 | case ',': | |
1041 | return (scm_read_quote (chr, port)); | |
1042 | case '#': | |
1043 | { | |
1044 | SCM result; | |
1045 | result = scm_read_sharp (chr, port); | |
1046 | if (scm_is_eq (result, SCM_UNSPECIFIED)) | |
1047 | /* We read a comment or some such. */ | |
1048 | break; | |
1049 | else | |
1050 | return result; | |
1051 | } | |
1052 | case ')': | |
1053 | scm_i_input_error (FUNC_NAME, port, "unexpected \")\"", SCM_EOL); | |
1054 | break; | |
1055 | case EOF: | |
1056 | return SCM_EOF_VAL; | |
1057 | case ':': | |
1058 | if (scm_is_eq (SCM_PACK (SCM_KEYWORD_STYLE), scm_keyword_prefix)) | |
1059 | return scm_symbol_to_keyword (scm_read_expression (port)); | |
1060 | /* Fall through. */ | |
1061 | ||
1062 | default: | |
1063 | { | |
1064 | if (((chr >= '0') && (chr <= '9')) | |
1065 | || (strchr ("+-.", chr))) | |
1066 | return (scm_read_number (chr, port)); | |
1067 | else | |
1068 | return (scm_read_mixed_case_symbol (chr, port)); | |
1069 | } | |
1070 | } | |
1071 | } | |
1072 | } | |
1073 | #undef FUNC_NAME | |
1074 | ||
1075 | \f | |
1076 | /* Actual reader. */ | |
1077 | ||
1078 | SCM_DEFINE (scm_read, "read", 0, 1, 0, | |
1079 | (SCM port), | |
1080 | "Read an s-expression from the input port @var{port}, or from\n" | |
1081 | "the current input port if @var{port} is not specified.\n" | |
1082 | "Any whitespace before the next token is discarded.") | |
1083 | #define FUNC_NAME s_scm_read | |
1084 | { | |
1085 | int c; | |
1086 | ||
1087 | if (SCM_UNBNDP (port)) | |
1088 | port = scm_current_input_port (); | |
1089 | SCM_VALIDATE_OPINPORT (1, port); | |
1090 | ||
1091 | c = flush_ws (port, (char *) NULL); | |
1092 | if (EOF == c) | |
1093 | return SCM_EOF_VAL; | |
1094 | scm_ungetc (c, port); | |
1095 | ||
1096 | return (scm_read_expression (port)); | |
09a4f039 | 1097 | } |
db4b4ca6 | 1098 | #undef FUNC_NAME |
09a4f039 | 1099 | |
0f2d19dd JB |
1100 | |
1101 | \f | |
1102 | ||
7337d56d LC |
1103 | /* Used when recording expressions constructed by `scm_read_sharp ()'. */ |
1104 | static SCM | |
1105 | recsexpr (SCM obj, long line, int column, SCM filename) | |
1106 | { | |
1107 | if (!scm_is_pair(obj)) { | |
1108 | return obj; | |
1109 | } else { | |
1110 | SCM tmp = obj, copy; | |
1111 | /* If this sexpr is visible in the read:sharp source, we want to | |
1112 | keep that information, so only record non-constant cons cells | |
1113 | which haven't previously been read by the reader. */ | |
1114 | if (scm_is_false (scm_whash_lookup (scm_source_whash, obj))) | |
1115 | { | |
1116 | if (SCM_COPY_SOURCE_P) | |
1117 | { | |
1118 | copy = scm_cons (recsexpr (SCM_CAR (obj), line, column, filename), | |
1119 | SCM_UNDEFINED); | |
1120 | while ((tmp = SCM_CDR (tmp)) && scm_is_pair (tmp)) | |
1121 | { | |
1122 | SCM_SETCDR (copy, scm_cons (recsexpr (SCM_CAR (tmp), | |
1123 | line, | |
1124 | column, | |
1125 | filename), | |
1126 | SCM_UNDEFINED)); | |
1127 | copy = SCM_CDR (copy); | |
1128 | } | |
1129 | SCM_SETCDR (copy, tmp); | |
1130 | } | |
1131 | else | |
1132 | { | |
1133 | recsexpr (SCM_CAR (obj), line, column, filename); | |
1134 | while ((tmp = SCM_CDR (tmp)) && scm_is_pair (tmp)) | |
1135 | recsexpr (SCM_CAR (tmp), line, column, filename); | |
1136 | copy = SCM_UNDEFINED; | |
1137 | } | |
1138 | scm_whash_insert (scm_source_whash, | |
1139 | obj, | |
1140 | scm_make_srcprops (line, | |
1141 | column, | |
1142 | filename, | |
1143 | copy, | |
1144 | SCM_EOL)); | |
1145 | } | |
1146 | return obj; | |
1147 | } | |
1148 | } | |
1149 | ||
14de3b42 GH |
1150 | /* Manipulate the read-hash-procedures alist. This could be written in |
1151 | Scheme, but maybe it will also be used by C code during initialisation. */ | |
a1ec6916 | 1152 | SCM_DEFINE (scm_read_hash_extend, "read-hash-extend", 2, 0, 0, |
1bbd0b84 | 1153 | (SCM chr, SCM proc), |
dc7fa443 MG |
1154 | "Install the procedure @var{proc} for reading expressions\n" |
1155 | "starting with the character sequence @code{#} and @var{chr}.\n" | |
1156 | "@var{proc} will be called with two arguments: the character\n" | |
1157 | "@var{chr} and the port to read further data from. The object\n" | |
391f57e6 HWN |
1158 | "returned will be the return value of @code{read}. \n" |
1159 | "Passing @code{#f} for @var{proc} will remove a previous setting. \n" | |
1160 | ) | |
1bbd0b84 | 1161 | #define FUNC_NAME s_scm_read_hash_extend |
deca31e1 | 1162 | { |
fed9c9a2 GH |
1163 | SCM this; |
1164 | SCM prev; | |
1165 | ||
36284627 | 1166 | SCM_VALIDATE_CHAR (1, chr); |
7888309b | 1167 | SCM_ASSERT (scm_is_false (proc) |
bc36d050 | 1168 | || scm_is_eq (scm_procedure_p (proc), SCM_BOOL_T), |
36284627 | 1169 | proc, SCM_ARG2, FUNC_NAME); |
fed9c9a2 | 1170 | |
14de3b42 GH |
1171 | /* Check if chr is already in the alist. */ |
1172 | this = *scm_read_hash_procedures; | |
1173 | prev = SCM_BOOL_F; | |
fed9c9a2 GH |
1174 | while (1) |
1175 | { | |
d2e53ed6 | 1176 | if (scm_is_null (this)) |
fed9c9a2 GH |
1177 | { |
1178 | /* not found, so add it to the beginning. */ | |
7888309b | 1179 | if (scm_is_true (proc)) |
fed9c9a2 | 1180 | { |
14de3b42 GH |
1181 | *scm_read_hash_procedures = |
1182 | scm_cons (scm_cons (chr, proc), *scm_read_hash_procedures); | |
fed9c9a2 GH |
1183 | } |
1184 | break; | |
1185 | } | |
bc36d050 | 1186 | if (scm_is_eq (chr, SCM_CAAR (this))) |
fed9c9a2 GH |
1187 | { |
1188 | /* already in the alist. */ | |
7888309b | 1189 | if (scm_is_false (proc)) |
14de3b42 GH |
1190 | { |
1191 | /* remove it. */ | |
7888309b | 1192 | if (scm_is_false (prev)) |
14de3b42 GH |
1193 | { |
1194 | *scm_read_hash_procedures = | |
1195 | SCM_CDR (*scm_read_hash_procedures); | |
1196 | } | |
1197 | else | |
1198 | scm_set_cdr_x (prev, SCM_CDR (this)); | |
1199 | } | |
fed9c9a2 | 1200 | else |
14de3b42 GH |
1201 | { |
1202 | /* replace it. */ | |
1203 | scm_set_cdr_x (SCM_CAR (this), proc); | |
1204 | } | |
fed9c9a2 GH |
1205 | break; |
1206 | } | |
1207 | prev = this; | |
1208 | this = SCM_CDR (this); | |
1209 | } | |
deca31e1 | 1210 | |
deca31e1 GH |
1211 | return SCM_UNSPECIFIED; |
1212 | } | |
1bbd0b84 | 1213 | #undef FUNC_NAME |
0f2d19dd | 1214 | |
deca31e1 GH |
1215 | /* Recover the read-hash procedure corresponding to char c. */ |
1216 | static SCM | |
6e8d25a6 | 1217 | scm_get_hash_procedure (int c) |
deca31e1 | 1218 | { |
14de3b42 | 1219 | SCM rest = *scm_read_hash_procedures; |
fed9c9a2 | 1220 | |
deca31e1 GH |
1221 | while (1) |
1222 | { | |
d2e53ed6 | 1223 | if (scm_is_null (rest)) |
deca31e1 GH |
1224 | return SCM_BOOL_F; |
1225 | ||
7866a09b | 1226 | if (SCM_CHAR (SCM_CAAR (rest)) == c) |
deca31e1 GH |
1227 | return SCM_CDAR (rest); |
1228 | ||
1229 | rest = SCM_CDR (rest); | |
1230 | } | |
1231 | } | |
1cc91f1b | 1232 | |
0f2d19dd JB |
1233 | void |
1234 | scm_init_read () | |
0f2d19dd | 1235 | { |
14de3b42 | 1236 | scm_read_hash_procedures = |
86d31dfe | 1237 | SCM_VARIABLE_LOC (scm_c_define ("read-hash-procedures", SCM_EOL)); |
fed9c9a2 | 1238 | |
62560650 | 1239 | scm_init_opts (scm_read_options, scm_read_opts); |
a0599745 | 1240 | #include "libguile/read.x" |
0f2d19dd | 1241 | } |
89e00824 ML |
1242 | |
1243 | /* | |
1244 | Local Variables: | |
1245 | c-file-style: "gnu" | |
1246 | End: | |
1247 | */ |