Commit | Line | Data |
---|---|---|
58996e37 | 1 | /* Copyright (C) 1995, 1996, 1997, 1999, 2000, 2001, 2003, 2004, 2006, |
7a329029 | 2 | * 2007, 2008, 2009, 2010, 2011, 2012, 2014 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 | 28 | #include <string.h> |
889975e5 MG |
29 | #include <unistd.h> |
30 | #include <unicase.h> | |
684d664e | 31 | #include <unictype.h> |
96965a6e | 32 | #include <c-strcase.h> |
0fc54828 | 33 | #include <c-ctype.h> |
7337d56d | 34 | |
a0599745 | 35 | #include "libguile/_scm.h" |
0ba0b384 | 36 | #include "libguile/bytevectors.h" |
a0599745 MD |
37 | #include "libguile/chars.h" |
38 | #include "libguile/eval.h" | |
2fa901a5 | 39 | #include "libguile/arrays.h" |
cf396142 | 40 | #include "libguile/bitvectors.h" |
a0599745 MD |
41 | #include "libguile/keywords.h" |
42 | #include "libguile/alist.h" | |
43 | #include "libguile/srcprop.h" | |
44 | #include "libguile/hashtab.h" | |
45 | #include "libguile/hash.h" | |
46 | #include "libguile/ports.h" | |
f6f4feb0 | 47 | #include "libguile/ports-internal.h" |
49bb5bd3 | 48 | #include "libguile/fports.h" |
a0599745 MD |
49 | #include "libguile/root.h" |
50 | #include "libguile/strings.h" | |
ba1b2226 | 51 | #include "libguile/strports.h" |
a0599745 | 52 | #include "libguile/vectors.h" |
a0599745 | 53 | #include "libguile/validate.h" |
a4022e69 | 54 | #include "libguile/srfi-4.h" |
7337d56d | 55 | #include "libguile/srfi-13.h" |
ba1b2226 | 56 | |
a0599745 | 57 | #include "libguile/read.h" |
22fc179a HWN |
58 | #include "libguile/private-options.h" |
59 | ||
0f2d19dd JB |
60 | |
61 | \f | |
62 | ||
5bf6a6f0 | 63 | SCM_GLOBAL_SYMBOL (scm_sym_dot, "."); |
c7733771 | 64 | SCM_SYMBOL (scm_keyword_prefix, "prefix"); |
ef4cbc08 | 65 | SCM_SYMBOL (scm_keyword_postfix, "postfix"); |
7c4aad9c | 66 | SCM_SYMBOL (sym_nil, "nil"); |
c7733771 | 67 | |
bf9eb54a MW |
68 | /* SRFI-105 curly infix expression support */ |
69 | SCM_SYMBOL (sym_nfx, "$nfx$"); | |
70 | SCM_SYMBOL (sym_bracket_list, "$bracket-list$"); | |
71 | SCM_SYMBOL (sym_bracket_apply, "$bracket-apply$"); | |
72 | ||
73 | scm_t_option scm_read_opts[] = | |
74 | { | |
75 | { SCM_OPTION_BOOLEAN, "copy", 0, | |
76 | "Copy source code expressions." }, | |
77 | { SCM_OPTION_BOOLEAN, "positions", 1, | |
78 | "Record positions of source code expressions." }, | |
79 | { SCM_OPTION_BOOLEAN, "case-insensitive", 0, | |
80 | "Convert symbols to lower case."}, | |
81 | { SCM_OPTION_SCM, "keywords", (scm_t_bits) SCM_BOOL_F_BITS, | |
82 | "Style of keyword recognition: #f, 'prefix or 'postfix."}, | |
83 | { SCM_OPTION_BOOLEAN, "r6rs-hex-escapes", 0, | |
84 | "Use R6RS variable-length character and string hex escapes."}, | |
85 | { SCM_OPTION_BOOLEAN, "square-brackets", 1, | |
86 | "Treat `[' and `]' as parentheses, for R6RS compatibility."}, | |
87 | { SCM_OPTION_BOOLEAN, "hungry-eol-escapes", 0, | |
88 | "In strings, consume leading whitespace after an escaped end-of-line."}, | |
89 | { SCM_OPTION_BOOLEAN, "curly-infix", 0, | |
90 | "Support SRFI-105 curly infix expressions."}, | |
dc59631d MW |
91 | { SCM_OPTION_BOOLEAN, "r7rs-symbols", 0, |
92 | "Support R7RS |...| symbol notation."}, | |
bf9eb54a MW |
93 | { 0, }, |
94 | }; | |
b1b5433d MW |
95 | |
96 | /* Internal read options structure. This is initialized by 'scm_read' | |
ea8c9761 MW |
97 | from the global and per-port read options, and a pointer is passed |
98 | down to all helper functions. */ | |
99 | ||
100 | enum t_keyword_style | |
101 | { | |
102 | KEYWORD_STYLE_HASH_PREFIX, | |
103 | KEYWORD_STYLE_PREFIX, | |
104 | KEYWORD_STYLE_POSTFIX | |
105 | }; | |
b1b5433d | 106 | |
ea8c9761 MW |
107 | struct t_read_opts |
108 | { | |
b1b5433d MW |
109 | enum t_keyword_style keyword_style; |
110 | unsigned int copy_source_p : 1; | |
111 | unsigned int record_positions_p : 1; | |
112 | unsigned int case_insensitive_p : 1; | |
113 | unsigned int r6rs_escapes_p : 1; | |
114 | unsigned int square_brackets_p : 1; | |
115 | unsigned int hungry_eol_escapes_p : 1; | |
bf9eb54a MW |
116 | unsigned int curly_infix_p : 1; |
117 | unsigned int neoteric_p : 1; | |
dc59631d | 118 | unsigned int r7rs_symbols_p : 1; |
a16f6fe7 MD |
119 | }; |
120 | ||
b1b5433d MW |
121 | typedef struct t_read_opts scm_t_read_opts; |
122 | ||
a16f6fe7 | 123 | |
39e8f371 HWN |
124 | /* |
125 | Give meaningful error messages for errors | |
126 | ||
127 | We use the format | |
128 | ||
ba1b2226 | 129 | FILE:LINE:COL: MESSAGE |
39e8f371 HWN |
130 | This happened in .... |
131 | ||
132 | This is not standard GNU format, but the test-suite likes the real | |
133 | message to be in front. | |
134 | ||
39e8f371 HWN |
135 | */ |
136 | ||
137 | ||
a4022e69 MV |
138 | void |
139 | scm_i_input_error (char const *function, | |
140 | SCM port, const char *message, SCM arg) | |
ba1b2226 | 141 | { |
29a837fd MV |
142 | SCM fn = (scm_is_string (SCM_FILENAME(port)) |
143 | ? SCM_FILENAME(port) | |
144 | : scm_from_locale_string ("#<unknown port>")); | |
ba1b2226 | 145 | |
29a837fd | 146 | SCM string_port = scm_open_output_string (); |
ba1b2226 HWN |
147 | SCM string = SCM_EOL; |
148 | scm_simple_format (string_port, | |
272632a6 | 149 | scm_from_locale_string ("~A:~S:~S: ~A"), |
29a837fd | 150 | scm_list_4 (fn, |
b3aa4626 | 151 | scm_from_long (SCM_LINUM (port) + 1), |
b9bd8526 | 152 | scm_from_int (SCM_COL (port) + 1), |
272632a6 | 153 | scm_from_locale_string (message))); |
ba1b2226 HWN |
154 | |
155 | string = scm_get_output_string (string_port); | |
156 | scm_close_output_port (string_port); | |
4a655e50 | 157 | scm_error_scm (scm_from_latin1_symbol ("read-error"), |
a4022e69 | 158 | function? scm_from_locale_string (function) : SCM_BOOL_F, |
ba1b2226 | 159 | string, |
dd72382c | 160 | arg, |
ba1b2226 HWN |
161 | SCM_BOOL_F); |
162 | } | |
39e8f371 HWN |
163 | |
164 | ||
a1ec6916 | 165 | SCM_DEFINE (scm_read_options, "read-options-interface", 0, 1, 0, |
1bbd0b84 | 166 | (SCM setting), |
dc7fa443 MG |
167 | "Option interface for the read options. Instead of using\n" |
168 | "this procedure directly, use the procedures @code{read-enable},\n" | |
3939e9df | 169 | "@code{read-disable}, @code{read-set!} and @code{read-options}.") |
1bbd0b84 | 170 | #define FUNC_NAME s_scm_read_options |
a16f6fe7 | 171 | { |
b7ff98dd MD |
172 | SCM ans = scm_options (setting, |
173 | scm_read_opts, | |
1bbd0b84 | 174 | FUNC_NAME); |
b7ff98dd MD |
175 | if (SCM_COPY_SOURCE_P) |
176 | SCM_RECORD_POSITIONS_P = 1; | |
a16f6fe7 MD |
177 | return ans; |
178 | } | |
1bbd0b84 | 179 | #undef FUNC_NAME |
a16f6fe7 | 180 | |
d458073b AR |
181 | /* A fluid referring to an association list mapping extra hash |
182 | characters to procedures. */ | |
183 | static SCM *scm_i_read_hash_procedures; | |
deca31e1 | 184 | |
cfd15439 | 185 | static SCM |
d458073b AR |
186 | scm_i_read_hash_procedures_ref (void) |
187 | { | |
188 | return scm_fluid_ref (*scm_i_read_hash_procedures); | |
189 | } | |
190 | ||
cfd15439 | 191 | static void |
d458073b AR |
192 | scm_i_read_hash_procedures_set_x (SCM value) |
193 | { | |
194 | scm_fluid_set_x (*scm_i_read_hash_procedures, value); | |
195 | } | |
0f2d19dd | 196 | |
7337d56d LC |
197 | \f |
198 | /* Token readers. */ | |
0f2d19dd | 199 | |
0f2d19dd | 200 | |
7337d56d LC |
201 | /* Size of the C buffer used to read symbols and numbers. */ |
202 | #define READER_BUFFER_SIZE 128 | |
0f2d19dd | 203 | |
ff4d3672 LC |
204 | /* Number of 32-bit codepoints in the buffer used to read strings. */ |
205 | #define READER_STRING_BUFFER_SIZE 128 | |
0f2d19dd | 206 | |
7337d56d LC |
207 | /* The maximum size of Scheme character names. */ |
208 | #define READER_CHAR_NAME_MAX_SIZE 50 | |
1cc91f1b | 209 | |
02327c0c MW |
210 | /* The maximum size of reader directive names. */ |
211 | #define READER_DIRECTIVE_NAME_MAX_SIZE 50 | |
212 | ||
94115ae3 | 213 | |
7337d56d LC |
214 | /* `isblank' is only in C99. */ |
215 | #define CHAR_IS_BLANK_(_chr) \ | |
216 | (((_chr) == ' ') || ((_chr) == '\t') || ((_chr) == '\n') \ | |
d41668fa | 217 | || ((_chr) == '\f') || ((_chr) == '\r')) |
7337d56d LC |
218 | |
219 | #ifdef MSDOS | |
220 | # define CHAR_IS_BLANK(_chr) \ | |
221 | ((CHAR_IS_BLANK_ (chr)) || ((_chr) == 26)) | |
222 | #else | |
223 | # define CHAR_IS_BLANK CHAR_IS_BLANK_ | |
224 | #endif | |
225 | ||
226 | ||
227 | /* R5RS one-character delimiters (see section 7.1.1, ``Lexical | |
228 | structure''). */ | |
229 | #define CHAR_IS_R5RS_DELIMITER(c) \ | |
230 | (CHAR_IS_BLANK (c) \ | |
603234c6 | 231 | || (c) == ')' || (c) == '(' || (c) == ';' || (c) == '"') |
7337d56d | 232 | |
603234c6 MW |
233 | #define CHAR_IS_DELIMITER(c) \ |
234 | (CHAR_IS_R5RS_DELIMITER (c) \ | |
bf9eb54a MW |
235 | || (((c) == ']' || (c) == '[') && (opts->square_brackets_p \ |
236 | || opts->curly_infix_p)) \ | |
237 | || (((c) == '}' || (c) == '{') && opts->curly_infix_p)) | |
7337d56d LC |
238 | |
239 | /* Exponent markers, as defined in section 7.1.1 of R5RS, ``Lexical | |
240 | Structure''. */ | |
241 | #define CHAR_IS_EXPONENT_MARKER(_chr) \ | |
242 | (((_chr) == 'e') || ((_chr) == 's') || ((_chr) == 'f') \ | |
243 | || ((_chr) == 'd') || ((_chr) == 'l')) | |
244 | ||
454866e0 | 245 | /* Read an SCSH block comment. */ |
cfd15439 | 246 | static SCM scm_read_scsh_block_comment (scm_t_wchar, SCM); |
620c8965 | 247 | static SCM scm_read_r6rs_block_comment (scm_t_wchar, SCM); |
b1b5433d MW |
248 | static SCM scm_read_commented_expression (scm_t_wchar, SCM, scm_t_read_opts *); |
249 | static SCM scm_read_shebang (scm_t_wchar, SCM, scm_t_read_opts *); | |
620c8965 | 250 | static SCM scm_get_hash_procedure (int); |
454866e0 | 251 | |
69f90b0b MG |
252 | /* Read from PORT until a delimiter (e.g., a whitespace) is read. Put the |
253 | result in the pre-allocated buffer BUF. Return zero if the whole token has | |
254 | fewer than BUF_SIZE bytes, non-zero otherwise. READ will be set the number of | |
255 | bytes actually read. */ | |
cfd15439 | 256 | static int |
b1b5433d MW |
257 | read_token (SCM port, scm_t_read_opts *opts, |
258 | char *buf, size_t buf_size, size_t *read) | |
b662b7e9 | 259 | { |
69f90b0b | 260 | *read = 0; |
0520c320 | 261 | |
69f90b0b MG |
262 | while (*read < buf_size) |
263 | { | |
264 | int chr; | |
7337d56d | 265 | |
0d959103 | 266 | chr = scm_get_byte_or_eof_unlocked (port); |
889975e5 | 267 | |
69f90b0b MG |
268 | if (chr == EOF) |
269 | return 0; | |
270 | else if (CHAR_IS_DELIMITER (chr)) | |
271 | { | |
c932ce0b | 272 | scm_unget_byte_unlocked (chr, port); |
69f90b0b MG |
273 | return 0; |
274 | } | |
275 | else | |
276 | { | |
277 | *buf = (char) chr; | |
278 | buf++, (*read)++; | |
279 | } | |
280 | } | |
889975e5 | 281 | |
69f90b0b MG |
282 | return 1; |
283 | } | |
889975e5 | 284 | |
b662b7e9 LC |
285 | /* Like `read_token', but return either BUFFER, or a GC-allocated buffer |
286 | if the token doesn't fit in BUFFER_SIZE bytes. */ | |
287 | static char * | |
b1b5433d MW |
288 | read_complete_token (SCM port, scm_t_read_opts *opts, |
289 | char *buffer, size_t buffer_size, size_t *read) | |
69f90b0b MG |
290 | { |
291 | int overflow = 0; | |
b662b7e9 LC |
292 | size_t bytes_read, overflow_size = 0; |
293 | char *overflow_buffer = NULL; | |
1cc91f1b | 294 | |
69f90b0b MG |
295 | do |
296 | { | |
b1b5433d | 297 | overflow = read_token (port, opts, buffer, buffer_size, &bytes_read); |
69f90b0b MG |
298 | if (bytes_read == 0) |
299 | break; | |
300 | if (overflow || overflow_size != 0) | |
301 | { | |
302 | if (overflow_size == 0) | |
303 | { | |
b662b7e9 LC |
304 | overflow_buffer = scm_gc_malloc_pointerless (bytes_read, "read"); |
305 | memcpy (overflow_buffer, buffer, bytes_read); | |
69f90b0b MG |
306 | overflow_size = bytes_read; |
307 | } | |
308 | else | |
309 | { | |
7be3c2fc | 310 | char *new_buf = |
b662b7e9 LC |
311 | scm_gc_malloc_pointerless (overflow_size + bytes_read, "read"); |
312 | ||
313 | memcpy (new_buf, overflow_buffer, overflow_size); | |
314 | memcpy (new_buf + overflow_size, buffer, bytes_read); | |
315 | ||
316 | overflow_buffer = new_buf; | |
69f90b0b MG |
317 | overflow_size += bytes_read; |
318 | } | |
319 | } | |
889975e5 | 320 | } |
69f90b0b | 321 | while (overflow); |
889975e5 | 322 | |
69f90b0b MG |
323 | if (overflow_size) |
324 | *read = overflow_size; | |
b521d265 | 325 | else |
69f90b0b MG |
326 | *read = bytes_read; |
327 | ||
b662b7e9 | 328 | return (overflow_size > 0 ? overflow_buffer : buffer); |
889975e5 | 329 | } |
7337d56d LC |
330 | |
331 | /* Skip whitespace from PORT and return the first non-whitespace character | |
332 | read. Raise an error on end-of-file. */ | |
333 | static int | |
b1b5433d | 334 | flush_ws (SCM port, scm_t_read_opts *opts, const char *eoferr) |
0f2d19dd | 335 | { |
cfd15439 | 336 | scm_t_wchar c; |
0f2d19dd | 337 | while (1) |
be632904 | 338 | switch (c = scm_getc_unlocked (port)) |
0f2d19dd JB |
339 | { |
340 | case EOF: | |
341 | goteof: | |
342 | if (eoferr) | |
d156d3b7 | 343 | { |
a4022e69 MV |
344 | scm_i_input_error (eoferr, |
345 | port, | |
346 | "end of file", | |
347 | SCM_EOL); | |
d156d3b7 | 348 | } |
0f2d19dd | 349 | return c; |
7337d56d | 350 | |
0f2d19dd JB |
351 | case ';': |
352 | lp: | |
be632904 | 353 | switch (c = scm_getc_unlocked (port)) |
0f2d19dd JB |
354 | { |
355 | case EOF: | |
356 | goto goteof; | |
357 | default: | |
358 | goto lp; | |
359 | case SCM_LINE_INCREMENTORS: | |
360 | break; | |
361 | } | |
362 | break; | |
7337d56d | 363 | |
454866e0 | 364 | case '#': |
be632904 | 365 | switch (c = scm_getc_unlocked (port)) |
454866e0 LC |
366 | { |
367 | case EOF: | |
368 | eoferr = "read_sharp"; | |
369 | goto goteof; | |
370 | case '!': | |
b1b5433d | 371 | scm_read_shebang (c, port, opts); |
454866e0 | 372 | break; |
34f3d47d | 373 | case ';': |
b1b5433d | 374 | scm_read_commented_expression (c, port, opts); |
34f3d47d | 375 | break; |
620c8965 LC |
376 | case '|': |
377 | if (scm_is_false (scm_get_hash_procedure (c))) | |
378 | { | |
379 | scm_read_r6rs_block_comment (c, port); | |
380 | break; | |
381 | } | |
382 | /* fall through */ | |
454866e0 | 383 | default: |
c932ce0b | 384 | scm_ungetc_unlocked (c, port); |
454866e0 LC |
385 | return '#'; |
386 | } | |
387 | break; | |
388 | ||
0f2d19dd | 389 | case SCM_LINE_INCREMENTORS: |
0f2d19dd | 390 | case SCM_SINGLE_SPACES: |
0f2d19dd | 391 | case '\t': |
0f2d19dd | 392 | break; |
7337d56d | 393 | |
0f2d19dd JB |
394 | default: |
395 | return c; | |
396 | } | |
7337d56d LC |
397 | |
398 | return 0; | |
0f2d19dd JB |
399 | } |
400 | ||
401 | ||
7337d56d LC |
402 | \f |
403 | /* Token readers. */ | |
1cc91f1b | 404 | |
b1b5433d MW |
405 | static SCM scm_read_expression (SCM port, scm_t_read_opts *opts); |
406 | static SCM scm_read_sharp (int chr, SCM port, scm_t_read_opts *opts, | |
407 | long line, int column); | |
0f2d19dd | 408 | |
0f2d19dd | 409 | |
d6cb0203 | 410 | static SCM |
b1b5433d MW |
411 | maybe_annotate_source (SCM x, SCM port, scm_t_read_opts *opts, |
412 | long line, int column) | |
d6cb0203 | 413 | { |
b1b5433d | 414 | if (opts->record_positions_p) |
d6cb0203 MW |
415 | scm_i_set_source_properties_x (x, line, column, SCM_FILENAME (port)); |
416 | return x; | |
417 | } | |
0f2d19dd | 418 | |
09a4f039 | 419 | static SCM |
b1b5433d | 420 | scm_read_sexp (scm_t_wchar chr, SCM port, scm_t_read_opts *opts) |
7337d56d | 421 | #define FUNC_NAME "scm_i_lreadparen" |
09a4f039 | 422 | { |
26c8cc14 AW |
423 | int c; |
424 | SCM tmp, tl, ans = SCM_EOL; | |
bf9eb54a MW |
425 | const int curly_list_p = (chr == '{') && opts->curly_infix_p; |
426 | const int terminating_char = ((chr == '{') ? '}' | |
427 | : ((chr == '[') ? ']' | |
428 | : ')')); | |
7337d56d LC |
429 | |
430 | /* Need to capture line and column numbers here. */ | |
431 | long line = SCM_LINUM (port); | |
432 | int column = SCM_COL (port) - 1; | |
f9c68a47 | 433 | |
b1b5433d | 434 | c = flush_ws (port, opts, FUNC_NAME); |
7337d56d LC |
435 | if (terminating_char == c) |
436 | return SCM_EOL; | |
f9c68a47 | 437 | |
c932ce0b | 438 | scm_ungetc_unlocked (c, port); |
b1b5433d | 439 | tmp = scm_read_expression (port, opts); |
1f7945a7 AW |
440 | |
441 | /* Note that it is possible for scm_read_expression to return | |
442 | scm_sym_dot, but not as part of a dotted pair: as in #{.}#. So | |
443 | check that it's a real dot by checking `c'. */ | |
444 | if (c == '.' && scm_is_eq (scm_sym_dot, tmp)) | |
7337d56d | 445 | { |
b1b5433d MW |
446 | ans = scm_read_expression (port, opts); |
447 | if (terminating_char != (c = flush_ws (port, opts, FUNC_NAME))) | |
7337d56d LC |
448 | scm_i_input_error (FUNC_NAME, port, "missing close paren", |
449 | SCM_EOL); | |
450 | return ans; | |
451 | } | |
1cc91f1b | 452 | |
7337d56d LC |
453 | /* Build the head of the list structure. */ |
454 | ans = tl = scm_cons (tmp, SCM_EOL); | |
455 | ||
b1b5433d | 456 | while (terminating_char != (c = flush_ws (port, opts, FUNC_NAME))) |
0f2d19dd | 457 | { |
7337d56d | 458 | SCM new_tail; |
0f2d19dd | 459 | |
bf9eb54a MW |
460 | if (c == ')' || (c == ']' && opts->square_brackets_p) |
461 | || ((c == '}' || c == ']') && opts->curly_infix_p)) | |
5b69315e AW |
462 | scm_i_input_error (FUNC_NAME, port, |
463 | "in pair: mismatched close paren: ~A", | |
464 | scm_list_1 (SCM_MAKE_CHAR (c))); | |
465 | ||
c932ce0b | 466 | scm_ungetc_unlocked (c, port); |
b1b5433d | 467 | tmp = scm_read_expression (port, opts); |
5b69315e | 468 | |
1f7945a7 AW |
469 | /* See above note about scm_sym_dot. */ |
470 | if (c == '.' && scm_is_eq (scm_sym_dot, tmp)) | |
0f2d19dd | 471 | { |
b1b5433d | 472 | SCM_SETCDR (tl, scm_read_expression (port, opts)); |
7337d56d | 473 | |
b1b5433d | 474 | c = flush_ws (port, opts, FUNC_NAME); |
7337d56d LC |
475 | if (terminating_char != c) |
476 | scm_i_input_error (FUNC_NAME, port, | |
477 | "in pair: missing close paren", SCM_EOL); | |
bf9eb54a | 478 | break; |
0f2d19dd | 479 | } |
b858464a | 480 | |
7337d56d LC |
481 | new_tail = scm_cons (tmp, SCM_EOL); |
482 | SCM_SETCDR (tl, new_tail); | |
483 | tl = new_tail; | |
7337d56d | 484 | } |
0f2d19dd | 485 | |
bf9eb54a MW |
486 | if (curly_list_p) |
487 | { | |
488 | /* In addition to finding the length, 'scm_ilength' checks for | |
489 | improper or circular lists, in which case it returns -1. */ | |
490 | int len = scm_ilength (ans); | |
491 | ||
492 | /* The (len == 0) case is handled above */ | |
493 | if (len == 1) | |
494 | /* Return directly to avoid re-annotating the element's source | |
495 | location with the position of the outer brace. Also, it | |
496 | might not be possible to annotate the element. */ | |
497 | return scm_car (ans); /* {e} => e */ | |
498 | else if (len == 2) | |
499 | ; /* Leave the list unchanged: {e1 e2} => (e1 e2) */ | |
500 | else if (len >= 3 && (len & 1)) | |
501 | { | |
502 | /* It's a proper list whose length is odd and at least 3. If | |
503 | the elements at odd indices (the infix operator positions) | |
504 | are all 'equal?', then it's a simple curly-infix list. | |
505 | Otherwise it's a mixed curly-infix list. */ | |
506 | SCM op = scm_cadr (ans); | |
507 | ||
508 | /* Check to see if the elements at odd indices are 'equal?' */ | |
509 | for (tl = scm_cdddr (ans); ; tl = scm_cddr (tl)) | |
510 | { | |
511 | if (scm_is_null (tl)) | |
512 | { | |
513 | /* Convert simple curly-infix list to prefix: | |
514 | {a <op> b <op> ...} => (<op> a b ...) */ | |
515 | tl = ans; | |
516 | while (scm_is_pair (scm_cdr (tl))) | |
517 | { | |
518 | tmp = scm_cddr (tl); | |
519 | SCM_SETCDR (tl, tmp); | |
520 | tl = tmp; | |
521 | } | |
522 | ans = scm_cons (op, ans); | |
523 | break; | |
524 | } | |
525 | else if (scm_is_false (scm_equal_p (op, scm_car (tl)))) | |
526 | { | |
527 | /* Mixed curly-infix list: {e ...} => ($nfx$ e ...) */ | |
528 | ans = scm_cons (sym_nfx, ans); | |
529 | break; | |
530 | } | |
531 | } | |
532 | } | |
533 | else | |
534 | /* Mixed curly-infix (possibly improper) list: | |
535 | {e . tail} => ($nfx$ e . tail) */ | |
536 | ans = scm_cons (sym_nfx, ans); | |
537 | } | |
538 | ||
b1b5433d | 539 | return maybe_annotate_source (ans, port, opts, line, column); |
7337d56d LC |
540 | } |
541 | #undef FUNC_NAME | |
a4022e69 | 542 | |
c5661d28 MG |
543 | |
544 | /* Read a hexadecimal number NDIGITS in length. Put its value into the variable | |
dea901d6 MG |
545 | C. If TERMINATOR is non-null, terminate early if the TERMINATOR character is |
546 | found. */ | |
547 | #define SCM_READ_HEX_ESCAPE(ndigits, terminator) \ | |
548 | do \ | |
549 | { \ | |
550 | scm_t_wchar a; \ | |
551 | size_t i = 0; \ | |
552 | c = 0; \ | |
553 | while (i < ndigits) \ | |
554 | { \ | |
be632904 | 555 | a = scm_getc_unlocked (port); \ |
dea901d6 MG |
556 | if (a == EOF) \ |
557 | goto str_eof; \ | |
558 | if (terminator \ | |
559 | && (a == (scm_t_wchar) terminator) \ | |
560 | && (i > 0)) \ | |
561 | break; \ | |
562 | if ('0' <= a && a <= '9') \ | |
563 | a -= '0'; \ | |
564 | else if ('A' <= a && a <= 'F') \ | |
565 | a = a - 'A' + 10; \ | |
566 | else if ('a' <= a && a <= 'f') \ | |
567 | a = a - 'a' + 10; \ | |
568 | else \ | |
569 | { \ | |
570 | c = a; \ | |
571 | goto bad_escaped; \ | |
572 | } \ | |
573 | c = c * 16 + a; \ | |
574 | i ++; \ | |
575 | } \ | |
c5661d28 MG |
576 | } while (0) |
577 | ||
684d664e AW |
578 | static void |
579 | skip_intraline_whitespace (SCM port) | |
580 | { | |
581 | scm_t_wchar c; | |
582 | ||
583 | do | |
584 | { | |
be632904 | 585 | c = scm_getc_unlocked (port); |
684d664e AW |
586 | if (c == EOF) |
587 | return; | |
588 | } | |
589 | while (c == '\t' || uc_is_general_category (c, UC_SPACE_SEPARATOR)); | |
590 | ||
c932ce0b | 591 | scm_ungetc_unlocked (c, port); |
684d664e AW |
592 | } |
593 | ||
dc59631d MW |
594 | /* Read either a double-quoted string or an R7RS-style symbol delimited |
595 | by vertical lines, depending on the value of 'chr' ('"' or '|'). | |
596 | Regardless, the result is always returned as a string. */ | |
7337d56d | 597 | static SCM |
dc59631d | 598 | scm_read_string_like_syntax (int chr, SCM port, scm_t_read_opts *opts) |
7337d56d LC |
599 | #define FUNC_NAME "scm_lreadr" |
600 | { | |
601 | /* For strings smaller than C_STR, this function creates only one Scheme | |
602 | object (the string returned). */ | |
0f2d19dd | 603 | |
ff4d3672 LC |
604 | SCM str = SCM_EOL; |
605 | size_t c_str_len = 0; | |
606 | scm_t_wchar c, c_str[READER_STRING_BUFFER_SIZE]; | |
eb42ff25 | 607 | |
b131b233 MW |
608 | /* Need to capture line and column numbers here. */ |
609 | long line = SCM_LINUM (port); | |
610 | int column = SCM_COL (port) - 1; | |
611 | ||
c92ee2b3 | 612 | while (chr != (c = scm_getc_unlocked (port))) |
7337d56d LC |
613 | { |
614 | if (c == EOF) | |
9c44cd45 MG |
615 | { |
616 | str_eof: | |
617 | scm_i_input_error (FUNC_NAME, port, | |
dc59631d MW |
618 | (chr == '|' |
619 | ? "end of file in symbol" | |
620 | : "end of file in string constant"), | |
621 | SCM_EOL); | |
9c44cd45 | 622 | } |
0f2d19dd | 623 | |
ff4d3672 LC |
624 | if (c_str_len + 1 >= READER_STRING_BUFFER_SIZE) |
625 | { | |
626 | str = scm_cons (scm_from_utf32_stringn (c_str, c_str_len), str); | |
627 | c_str_len = 0; | |
628 | } | |
0f2d19dd | 629 | |
7337d56d | 630 | if (c == '\\') |
9c44cd45 | 631 | { |
be632904 | 632 | switch (c = scm_getc_unlocked (port)) |
9c44cd45 MG |
633 | { |
634 | case EOF: | |
635 | goto str_eof; | |
6579c330 | 636 | case '|': |
9c44cd45 MG |
637 | case '\\': |
638 | break; | |
9c44cd45 | 639 | case '\n': |
b1b5433d | 640 | if (opts->hungry_eol_escapes_p) |
684d664e | 641 | skip_intraline_whitespace (port); |
9c44cd45 MG |
642 | continue; |
643 | case '0': | |
644 | c = '\0'; | |
645 | break; | |
646 | case 'f': | |
647 | c = '\f'; | |
648 | break; | |
649 | case 'n': | |
650 | c = '\n'; | |
651 | break; | |
652 | case 'r': | |
653 | c = '\r'; | |
654 | break; | |
655 | case 't': | |
656 | c = '\t'; | |
657 | break; | |
658 | case 'a': | |
659 | c = '\007'; | |
660 | break; | |
661 | case 'v': | |
662 | c = '\v'; | |
663 | break; | |
67a4a16d MG |
664 | case 'b': |
665 | c = '\010'; | |
666 | break; | |
9c44cd45 | 667 | case 'x': |
dc59631d | 668 | if (opts->r6rs_escapes_p || chr == '|') |
dea901d6 MG |
669 | SCM_READ_HEX_ESCAPE (10, ';'); |
670 | else | |
671 | SCM_READ_HEX_ESCAPE (2, '\0'); | |
c5661d28 | 672 | break; |
9c44cd45 | 673 | case 'u': |
b1b5433d | 674 | if (!opts->r6rs_escapes_p) |
898a0b5a MG |
675 | { |
676 | SCM_READ_HEX_ESCAPE (4, '\0'); | |
677 | break; | |
678 | } | |
9c44cd45 | 679 | case 'U': |
b1b5433d | 680 | if (!opts->r6rs_escapes_p) |
898a0b5a MG |
681 | { |
682 | SCM_READ_HEX_ESCAPE (6, '\0'); | |
683 | break; | |
684 | } | |
9c44cd45 | 685 | default: |
dc59631d MW |
686 | if (c == chr) |
687 | break; | |
9c44cd45 MG |
688 | bad_escaped: |
689 | scm_i_input_error (FUNC_NAME, port, | |
690 | "illegal character in escape sequence: ~S", | |
691 | scm_list_1 (SCM_MAKE_CHAR (c))); | |
692 | } | |
693 | } | |
ff4d3672 LC |
694 | |
695 | c_str[c_str_len++] = c; | |
7337d56d | 696 | } |
ff4d3672 LC |
697 | |
698 | if (scm_is_null (str)) | |
699 | /* Fast path: we got a string that fits in C_STR. */ | |
700 | str = scm_from_utf32_stringn (c_str, c_str_len); | |
701 | else | |
702 | { | |
703 | if (c_str_len > 0) | |
704 | str = scm_cons (scm_from_utf32_stringn (c_str, c_str_len), str); | |
705 | ||
706 | str = scm_string_concatenate_reverse (str, SCM_UNDEFINED, SCM_UNDEFINED); | |
707 | } | |
708 | ||
b1b5433d | 709 | return maybe_annotate_source (str, port, opts, line, column); |
0f2d19dd | 710 | } |
db4b4ca6 DH |
711 | #undef FUNC_NAME |
712 | ||
dc59631d MW |
713 | static SCM |
714 | scm_read_string (int chr, SCM port, scm_t_read_opts *opts) | |
715 | { | |
716 | return scm_read_string_like_syntax (chr, port, opts); | |
717 | } | |
718 | ||
719 | static SCM | |
720 | scm_read_r7rs_symbol (int chr, SCM port, scm_t_read_opts *opts) | |
721 | { | |
722 | return scm_string_to_symbol (scm_read_string_like_syntax (chr, port, opts)); | |
723 | } | |
0f2d19dd | 724 | |
7337d56d | 725 | static SCM |
b1b5433d | 726 | scm_read_number (scm_t_wchar chr, SCM port, scm_t_read_opts *opts) |
0f2d19dd | 727 | { |
69f90b0b | 728 | SCM result, str = SCM_EOL; |
b662b7e9 | 729 | char local_buffer[READER_BUFFER_SIZE], *buffer; |
69f90b0b | 730 | size_t bytes_read; |
0f2d19dd | 731 | |
38f19074 MW |
732 | /* Need to capture line and column numbers here. */ |
733 | long line = SCM_LINUM (port); | |
734 | int column = SCM_COL (port) - 1; | |
735 | ||
c932ce0b | 736 | scm_ungetc_unlocked (chr, port); |
b1b5433d | 737 | buffer = read_complete_token (port, opts, local_buffer, sizeof local_buffer, |
b662b7e9 | 738 | &bytes_read); |
69f90b0b | 739 | |
08467a7e | 740 | str = scm_from_port_stringn (buffer, bytes_read, port); |
69f90b0b MG |
741 | |
742 | result = scm_string_to_number (str, SCM_UNDEFINED); | |
38f19074 | 743 | if (scm_is_false (result)) |
69f90b0b MG |
744 | { |
745 | /* Return a symbol instead of a number */ | |
b1b5433d | 746 | if (opts->case_insensitive_p) |
69f90b0b MG |
747 | str = scm_string_downcase_x (str); |
748 | result = scm_string_to_symbol (str); | |
749 | } | |
38f19074 | 750 | else if (SCM_NIMP (result)) |
b1b5433d | 751 | result = maybe_annotate_source (result, port, opts, line, column); |
0f2d19dd | 752 | |
69f90b0b | 753 | SCM_COL (port) += scm_i_string_length (str); |
7337d56d LC |
754 | return result; |
755 | } | |
0f2d19dd | 756 | |
7337d56d | 757 | static SCM |
b1b5433d | 758 | scm_read_mixed_case_symbol (scm_t_wchar chr, SCM port, scm_t_read_opts *opts) |
7337d56d | 759 | { |
889975e5 MG |
760 | SCM result; |
761 | int ends_with_colon = 0; | |
69f90b0b | 762 | size_t bytes_read; |
b1b5433d | 763 | int postfix = (opts->keyword_style == KEYWORD_STYLE_POSTFIX); |
b662b7e9 | 764 | char local_buffer[READER_BUFFER_SIZE], *buffer; |
69f90b0b | 765 | SCM str; |
7337d56d | 766 | |
c932ce0b | 767 | scm_ungetc_unlocked (chr, port); |
b1b5433d | 768 | buffer = read_complete_token (port, opts, local_buffer, sizeof local_buffer, |
b662b7e9 | 769 | &bytes_read); |
69f90b0b | 770 | if (bytes_read > 0) |
b662b7e9 | 771 | ends_with_colon = buffer[bytes_read - 1] == ':'; |
ef4cbc08 | 772 | |
69f90b0b MG |
773 | if (postfix && ends_with_colon && (bytes_read > 1)) |
774 | { | |
08467a7e | 775 | str = scm_from_port_stringn (buffer, bytes_read - 1, port); |
69f90b0b | 776 | |
b1b5433d | 777 | if (opts->case_insensitive_p) |
69f90b0b MG |
778 | str = scm_string_downcase_x (str); |
779 | result = scm_symbol_to_keyword (scm_string_to_symbol (str)); | |
780 | } | |
7337d56d | 781 | else |
69f90b0b | 782 | { |
08467a7e | 783 | str = scm_from_port_stringn (buffer, bytes_read, port); |
69f90b0b | 784 | |
b1b5433d | 785 | if (opts->case_insensitive_p) |
69f90b0b MG |
786 | str = scm_string_downcase_x (str); |
787 | result = scm_string_to_symbol (str); | |
788 | } | |
7337d56d | 789 | |
69f90b0b | 790 | SCM_COL (port) += scm_i_string_length (str); |
7337d56d LC |
791 | return result; |
792 | } | |
793 | ||
794 | static SCM | |
b1b5433d | 795 | scm_read_number_and_radix (scm_t_wchar chr, SCM port, scm_t_read_opts *opts) |
7337d56d LC |
796 | #define FUNC_NAME "scm_lreadr" |
797 | { | |
889975e5 | 798 | SCM result; |
7337d56d | 799 | size_t read; |
b662b7e9 | 800 | char local_buffer[READER_BUFFER_SIZE], *buffer; |
7337d56d | 801 | unsigned int radix; |
69f90b0b | 802 | SCM str; |
7337d56d LC |
803 | |
804 | switch (chr) | |
805 | { | |
806 | case 'B': | |
807 | case 'b': | |
808 | radix = 2; | |
809 | break; | |
810 | ||
811 | case 'o': | |
812 | case 'O': | |
813 | radix = 8; | |
814 | break; | |
815 | ||
816 | case 'd': | |
817 | case 'D': | |
818 | radix = 10; | |
819 | break; | |
820 | ||
821 | case 'x': | |
822 | case 'X': | |
823 | radix = 16; | |
824 | break; | |
825 | ||
826 | default: | |
c932ce0b AW |
827 | scm_ungetc_unlocked (chr, port); |
828 | scm_ungetc_unlocked ('#', port); | |
7337d56d LC |
829 | radix = 10; |
830 | } | |
831 | ||
b1b5433d | 832 | buffer = read_complete_token (port, opts, local_buffer, sizeof local_buffer, |
b662b7e9 | 833 | &read); |
69f90b0b | 834 | |
08467a7e | 835 | str = scm_from_port_stringn (buffer, read, port); |
69f90b0b MG |
836 | |
837 | result = scm_string_to_number (str, scm_from_uint (radix)); | |
838 | ||
69f90b0b | 839 | SCM_COL (port) += scm_i_string_length (str); |
7337d56d LC |
840 | |
841 | if (scm_is_true (result)) | |
842 | return result; | |
843 | ||
844 | scm_i_input_error (FUNC_NAME, port, "unknown # object", SCM_EOL); | |
845 | ||
846 | return SCM_BOOL_F; | |
847 | } | |
848 | #undef FUNC_NAME | |
849 | ||
850 | static SCM | |
b1b5433d | 851 | scm_read_quote (int chr, SCM port, scm_t_read_opts *opts) |
7337d56d LC |
852 | { |
853 | SCM p; | |
492faee1 LC |
854 | long line = SCM_LINUM (port); |
855 | int column = SCM_COL (port) - 1; | |
7337d56d LC |
856 | |
857 | switch (chr) | |
858 | { | |
859 | case '`': | |
860 | p = scm_sym_quasiquote; | |
861 | break; | |
862 | ||
863 | case '\'': | |
864 | p = scm_sym_quote; | |
865 | break; | |
866 | ||
867 | case ',': | |
868 | { | |
889975e5 | 869 | scm_t_wchar c; |
7337d56d | 870 | |
be632904 | 871 | c = scm_getc_unlocked (port); |
7337d56d LC |
872 | if ('@' == c) |
873 | p = scm_sym_uq_splicing; | |
874 | else | |
0f2d19dd | 875 | { |
c932ce0b | 876 | scm_ungetc_unlocked (c, port); |
7337d56d | 877 | p = scm_sym_unquote; |
0f2d19dd | 878 | } |
7337d56d LC |
879 | break; |
880 | } | |
0f2d19dd | 881 | |
7337d56d LC |
882 | default: |
883 | fprintf (stderr, "%s: unhandled quote character (%i)\n", | |
7f74cf9a | 884 | "scm_read_quote", chr); |
7337d56d | 885 | abort (); |
0f2d19dd | 886 | } |
1cc91f1b | 887 | |
b1b5433d MW |
888 | p = scm_cons2 (p, scm_read_expression (port, opts), SCM_EOL); |
889 | return maybe_annotate_source (p, port, opts, line, column); | |
7337d56d LC |
890 | } |
891 | ||
34f3d47d AW |
892 | SCM_SYMBOL (sym_syntax, "syntax"); |
893 | SCM_SYMBOL (sym_quasisyntax, "quasisyntax"); | |
894 | SCM_SYMBOL (sym_unsyntax, "unsyntax"); | |
895 | SCM_SYMBOL (sym_unsyntax_splicing, "unsyntax-splicing"); | |
896 | ||
897 | static SCM | |
b1b5433d | 898 | scm_read_syntax (int chr, SCM port, scm_t_read_opts *opts) |
34f3d47d AW |
899 | { |
900 | SCM p; | |
901 | long line = SCM_LINUM (port); | |
902 | int column = SCM_COL (port) - 1; | |
903 | ||
904 | switch (chr) | |
905 | { | |
906 | case '`': | |
907 | p = sym_quasisyntax; | |
908 | break; | |
909 | ||
910 | case '\'': | |
911 | p = sym_syntax; | |
912 | break; | |
913 | ||
914 | case ',': | |
915 | { | |
916 | int c; | |
917 | ||
be632904 | 918 | c = scm_getc_unlocked (port); |
34f3d47d AW |
919 | if ('@' == c) |
920 | p = sym_unsyntax_splicing; | |
921 | else | |
922 | { | |
c932ce0b | 923 | scm_ungetc_unlocked (c, port); |
34f3d47d AW |
924 | p = sym_unsyntax; |
925 | } | |
926 | break; | |
927 | } | |
928 | ||
929 | default: | |
930 | fprintf (stderr, "%s: unhandled syntax character (%i)\n", | |
931 | "scm_read_syntax", chr); | |
932 | abort (); | |
933 | } | |
934 | ||
b1b5433d MW |
935 | p = scm_cons2 (p, scm_read_expression (port, opts), SCM_EOL); |
936 | return maybe_annotate_source (p, port, opts, line, column); | |
34f3d47d AW |
937 | } |
938 | ||
cfd15439 | 939 | static SCM |
b1b5433d | 940 | scm_read_nil (int chr, SCM port, scm_t_read_opts *opts) |
7c4aad9c | 941 | { |
b1b5433d | 942 | SCM id = scm_read_mixed_case_symbol (chr, port, opts); |
7c4aad9c AW |
943 | |
944 | if (!scm_is_eq (id, sym_nil)) | |
945 | scm_i_input_error ("scm_read_nil", port, | |
946 | "unexpected input while reading #nil: ~a", | |
947 | scm_list_1 (id)); | |
948 | ||
949 | return SCM_ELISP_NIL; | |
950 | } | |
951 | ||
cfd15439 | 952 | static SCM |
7337d56d | 953 | scm_read_semicolon_comment (int chr, SCM port) |
0f2d19dd | 954 | { |
0f2d19dd JB |
955 | int c; |
956 | ||
889975e5 MG |
957 | /* We use the get_byte here because there is no need to get the |
958 | locale correct with comment input. This presumes that newline | |
959 | always represents itself no matter what the encoding is. */ | |
0d959103 | 960 | for (c = scm_get_byte_or_eof_unlocked (port); |
7337d56d | 961 | (c != EOF) && (c != '\n'); |
0d959103 | 962 | c = scm_get_byte_or_eof_unlocked (port)); |
7337d56d LC |
963 | |
964 | return SCM_UNSPECIFIED; | |
965 | } | |
966 | ||
7a329029 MW |
967 | /* If the EXPECTED_CHARS are the next ones available from PORT, then |
968 | consume them and return 1. Otherwise leave the port position where | |
969 | it was and return 0. EXPECTED_CHARS should be all lowercase, and | |
970 | will be matched case-insensitively against the characters read from | |
971 | PORT. */ | |
972 | static int | |
973 | try_read_ci_chars (SCM port, const char *expected_chars) | |
974 | { | |
975 | int num_chars_wanted = strlen (expected_chars); | |
976 | int num_chars_read = 0; | |
977 | char *chars_read = alloca (num_chars_wanted); | |
978 | int c; | |
979 | ||
980 | while (num_chars_read < num_chars_wanted) | |
981 | { | |
cb8aaef4 | 982 | c = scm_getc_unlocked (port); |
7a329029 MW |
983 | if (c == EOF) |
984 | break; | |
0fc54828 | 985 | else if (c_tolower (c) != expected_chars[num_chars_read]) |
7a329029 | 986 | { |
cb8aaef4 | 987 | scm_ungetc_unlocked (c, port); |
7a329029 MW |
988 | break; |
989 | } | |
990 | else | |
991 | chars_read[num_chars_read++] = c; | |
992 | } | |
993 | ||
994 | if (num_chars_read == num_chars_wanted) | |
995 | return 1; | |
996 | else | |
997 | { | |
998 | while (num_chars_read > 0) | |
cb8aaef4 | 999 | scm_ungetc_unlocked (chars_read[--num_chars_read], port); |
7a329029 MW |
1000 | return 0; |
1001 | } | |
1002 | } | |
1003 | ||
7337d56d LC |
1004 | \f |
1005 | /* Sharp readers, i.e. readers called after a `#' sign has been read. */ | |
1006 | ||
1007 | static SCM | |
1008 | scm_read_boolean (int chr, SCM port) | |
1009 | { | |
1010 | switch (chr) | |
0f2d19dd | 1011 | { |
7337d56d LC |
1012 | case 't': |
1013 | case 'T': | |
7a329029 | 1014 | try_read_ci_chars (port, "rue"); |
7337d56d LC |
1015 | return SCM_BOOL_T; |
1016 | ||
1017 | case 'f': | |
1018 | case 'F': | |
7a329029 | 1019 | try_read_ci_chars (port, "alse"); |
7337d56d | 1020 | return SCM_BOOL_F; |
0f2d19dd | 1021 | } |
7337d56d LC |
1022 | |
1023 | return SCM_UNSPECIFIED; | |
1024 | } | |
1025 | ||
1026 | static SCM | |
b1b5433d | 1027 | scm_read_character (scm_t_wchar chr, SCM port, scm_t_read_opts *opts) |
7337d56d LC |
1028 | #define FUNC_NAME "scm_lreadr" |
1029 | { | |
69f90b0b MG |
1030 | char buffer[READER_CHAR_NAME_MAX_SIZE]; |
1031 | SCM charname; | |
1032 | size_t charname_len, bytes_read; | |
889975e5 MG |
1033 | scm_t_wchar cp; |
1034 | int overflow; | |
f6f4feb0 | 1035 | scm_t_port_internal *pti; |
889975e5 | 1036 | |
b1b5433d MW |
1037 | overflow = read_token (port, opts, buffer, READER_CHAR_NAME_MAX_SIZE, |
1038 | &bytes_read); | |
889975e5 | 1039 | if (overflow) |
c1a0ba1c | 1040 | scm_i_input_error (FUNC_NAME, port, "character name too long", SCM_EOL); |
7337d56d | 1041 | |
69f90b0b | 1042 | if (bytes_read == 0) |
0f2d19dd | 1043 | { |
be632904 | 1044 | chr = scm_getc_unlocked (port); |
7337d56d LC |
1045 | if (chr == EOF) |
1046 | scm_i_input_error (FUNC_NAME, port, "unexpected end of file " | |
1047 | "while reading character", SCM_EOL); | |
1048 | ||
1049 | /* CHR must be a token delimiter, like a whitespace. */ | |
1050 | return (SCM_MAKE_CHAR (chr)); | |
0f2d19dd | 1051 | } |
7337d56d | 1052 | |
f6f4feb0 | 1053 | pti = SCM_PORT_GET_INTERNAL (port); |
7337d56d | 1054 | |
69f90b0b MG |
1055 | /* Simple ASCII characters can be processed immediately. Also, simple |
1056 | ISO-8859-1 characters can be processed immediately if the encoding for this | |
1057 | port is ISO-8859-1. */ | |
d1b9f8ac AW |
1058 | if (bytes_read == 1 && |
1059 | ((unsigned char) buffer[0] <= 127 | |
f6f4feb0 | 1060 | || pti->encoding_mode == SCM_PORT_ENCODING_MODE_LATIN1)) |
69f90b0b MG |
1061 | { |
1062 | SCM_COL (port) += 1; | |
1063 | return SCM_MAKE_CHAR (buffer[0]); | |
1064 | } | |
1065 | ||
1066 | /* Otherwise, convert the buffer into a proper scheme string for | |
1067 | processing. */ | |
08467a7e | 1068 | charname = scm_from_port_stringn (buffer, bytes_read, port); |
69f90b0b MG |
1069 | charname_len = scm_i_string_length (charname); |
1070 | SCM_COL (port) += charname_len; | |
889975e5 | 1071 | cp = scm_i_string_ref (charname, 0); |
69f90b0b MG |
1072 | if (charname_len == 1) |
1073 | return SCM_MAKE_CHAR (cp); | |
1074 | ||
1075 | /* Ignore dotted circles, which may be used to keep combining characters from | |
1076 | combining with the backslash in #\charname. */ | |
0dcd7e61 MG |
1077 | if (cp == SCM_CODEPOINT_DOTTED_CIRCLE && charname_len == 2) |
1078 | return SCM_MAKE_CHAR (scm_i_string_ref (charname, 1)); | |
1079 | ||
889975e5 | 1080 | if (cp >= '0' && cp < '8') |
7337d56d LC |
1081 | { |
1082 | /* Dirk:FIXME:: This type of character syntax is not R5RS | |
1083 | * compliant. Further, it should be verified that the constant | |
0ffc78e3 | 1084 | * does only consist of octal digits. */ |
889975e5 | 1085 | SCM p = scm_string_to_number (charname, scm_from_uint (8)); |
7337d56d | 1086 | if (SCM_I_INUMP (p)) |
0ffc78e3 | 1087 | { |
e25f3727 | 1088 | scm_t_wchar c = scm_to_uint32 (p); |
0ffc78e3 MG |
1089 | if (SCM_IS_UNICODE_CHAR (c)) |
1090 | return SCM_MAKE_CHAR (c); | |
1091 | else | |
0f3a70cf | 1092 | scm_i_input_error (FUNC_NAME, port, |
0ffc78e3 MG |
1093 | "out-of-range octal character escape: ~a", |
1094 | scm_list_1 (charname)); | |
1095 | } | |
7337d56d LC |
1096 | } |
1097 | ||
0f3a70cf | 1098 | if (cp == 'x' && (charname_len > 1)) |
dea901d6 MG |
1099 | { |
1100 | SCM p; | |
0f3a70cf | 1101 | |
dea901d6 MG |
1102 | /* Convert from hex, skipping the initial 'x' character in CHARNAME */ |
1103 | p = scm_string_to_number (scm_c_substring (charname, 1, charname_len), | |
1104 | scm_from_uint (16)); | |
1105 | if (SCM_I_INUMP (p)) | |
1106 | { | |
e25f3727 | 1107 | scm_t_wchar c = scm_to_uint32 (p); |
dea901d6 MG |
1108 | if (SCM_IS_UNICODE_CHAR (c)) |
1109 | return SCM_MAKE_CHAR (c); | |
1110 | else | |
1111 | scm_i_input_error (FUNC_NAME, port, | |
1112 | "out-of-range hex character escape: ~a", | |
1113 | scm_list_1 (charname)); | |
1114 | } | |
1115 | } | |
1116 | ||
889975e5 MG |
1117 | /* The names of characters should never have non-Latin1 |
1118 | characters. */ | |
1119 | if (scm_i_is_narrow_string (charname) | |
1120 | || scm_i_try_narrow_string (charname)) | |
4769c9db AW |
1121 | { SCM ch = scm_i_charname_to_char (scm_i_string_chars (charname), |
1122 | charname_len); | |
1123 | if (scm_is_true (ch)) | |
1124 | return ch; | |
1125 | } | |
7337d56d | 1126 | |
7337d56d | 1127 | scm_i_input_error (FUNC_NAME, port, "unknown character name ~a", |
889975e5 | 1128 | scm_list_1 (charname)); |
7337d56d LC |
1129 | |
1130 | return SCM_UNSPECIFIED; | |
0f2d19dd | 1131 | } |
db4b4ca6 | 1132 | #undef FUNC_NAME |
0f2d19dd | 1133 | |
cfd15439 | 1134 | static SCM |
b1b5433d | 1135 | scm_read_keyword (int chr, SCM port, scm_t_read_opts *opts) |
7337d56d LC |
1136 | { |
1137 | SCM symbol; | |
1138 | ||
1139 | /* Read the symbol that comprises the keyword. Doing this instead of | |
1140 | invoking a specific symbol reader function allows `scm_read_keyword ()' | |
1141 | to adapt to the delimiters currently valid of symbols. | |
1cc91f1b | 1142 | |
7337d56d | 1143 | XXX: This implementation allows sloppy syntaxes like `#: key'. */ |
b1b5433d | 1144 | symbol = scm_read_expression (port, opts); |
7337d56d | 1145 | if (!scm_is_symbol (symbol)) |
7f74cf9a | 1146 | scm_i_input_error ("scm_read_keyword", port, |
7337d56d LC |
1147 | "keyword prefix `~a' not followed by a symbol: ~s", |
1148 | scm_list_2 (SCM_MAKE_CHAR (chr), symbol)); | |
1149 | ||
1150 | return (scm_symbol_to_keyword (symbol)); | |
1151 | } | |
1152 | ||
cfd15439 | 1153 | static SCM |
b1b5433d MW |
1154 | scm_read_vector (int chr, SCM port, scm_t_read_opts *opts, |
1155 | long line, int column) | |
09a4f039 | 1156 | { |
7337d56d LC |
1157 | /* Note: We call `scm_read_sexp ()' rather than READER here in order to |
1158 | guarantee that it's going to do what we want. After all, this is an | |
1159 | implementation detail of `scm_read_vector ()', not a desirable | |
1160 | property. */ | |
b1b5433d MW |
1161 | return maybe_annotate_source (scm_vector (scm_read_sexp (chr, port, opts)), |
1162 | port, opts, line, column); | |
b131b233 MW |
1163 | } |
1164 | ||
493ceb99 MW |
1165 | /* Helper used by scm_read_array */ |
1166 | static int | |
1167 | read_decimal_integer (SCM port, int c, ssize_t *resp) | |
1168 | { | |
1169 | ssize_t sign = 1; | |
1170 | ssize_t res = 0; | |
1171 | int got_it = 0; | |
1172 | ||
1173 | if (c == '-') | |
1174 | { | |
1175 | sign = -1; | |
fa980bcc | 1176 | c = scm_getc_unlocked (port); |
493ceb99 MW |
1177 | } |
1178 | ||
1179 | while ('0' <= c && c <= '9') | |
1180 | { | |
a662686a MW |
1181 | if (((SSIZE_MAX - (c-'0')) / 10) <= res) |
1182 | scm_i_input_error ("read_decimal_integer", port, | |
1183 | "number too large", SCM_EOL); | |
493ceb99 MW |
1184 | res = 10*res + c-'0'; |
1185 | got_it = 1; | |
fa980bcc | 1186 | c = scm_getc_unlocked (port); |
493ceb99 MW |
1187 | } |
1188 | ||
1189 | if (got_it) | |
1190 | *resp = sign * res; | |
1191 | return c; | |
7337d56d | 1192 | } |
09a4f039 | 1193 | |
493ceb99 MW |
1194 | /* Read an array. This function can also read vectors and uniform |
1195 | vectors. Also, the conflict between '#f' and '#f32' and '#f64' is | |
1196 | handled here. | |
1197 | ||
10744b7c | 1198 | C is the first character read after the '#'. */ |
b131b233 | 1199 | static SCM |
b1b5433d | 1200 | scm_read_array (int c, SCM port, scm_t_read_opts *opts, long line, int column) |
7337d56d | 1201 | { |
493ceb99 MW |
1202 | ssize_t rank; |
1203 | scm_t_wchar tag_buf[8]; | |
1204 | int tag_len; | |
1205 | ||
1206 | SCM tag, shape = SCM_BOOL_F, elements, array; | |
1207 | ||
1208 | /* XXX - shortcut for ordinary vectors. Shouldn't be necessary but | |
1209 | the array code can not deal with zero-length dimensions yet, and | |
10744b7c | 1210 | we want to allow zero-length vectors, of course. */ |
493ceb99 | 1211 | if (c == '(') |
b1b5433d | 1212 | return scm_read_vector (c, port, opts, line, column); |
493ceb99 | 1213 | |
10744b7c | 1214 | /* Disambiguate between '#f' and uniform floating point vectors. */ |
493ceb99 MW |
1215 | if (c == 'f') |
1216 | { | |
fa980bcc | 1217 | c = scm_getc_unlocked (port); |
493ceb99 MW |
1218 | if (c != '3' && c != '6') |
1219 | { | |
7a329029 MW |
1220 | if (c == 'a' && try_read_ci_chars (port, "lse")) |
1221 | return SCM_BOOL_F; | |
1222 | else if (c != EOF) | |
cb8aaef4 | 1223 | scm_ungetc_unlocked (c, port); |
493ceb99 MW |
1224 | return SCM_BOOL_F; |
1225 | } | |
1226 | rank = 1; | |
1227 | tag_buf[0] = 'f'; | |
1228 | tag_len = 1; | |
1229 | goto continue_reading_tag; | |
1230 | } | |
1231 | ||
1232 | /* Read rank. */ | |
1233 | rank = 1; | |
1234 | c = read_decimal_integer (port, c, &rank); | |
1235 | if (rank < 0) | |
1236 | scm_i_input_error (NULL, port, "array rank must be non-negative", | |
1237 | SCM_EOL); | |
1238 | ||
1239 | /* Read tag. */ | |
1240 | tag_len = 0; | |
1241 | continue_reading_tag: | |
1242 | while (c != EOF && c != '(' && c != '@' && c != ':' | |
1243 | && tag_len < sizeof tag_buf / sizeof tag_buf[0]) | |
1244 | { | |
1245 | tag_buf[tag_len++] = c; | |
fa980bcc | 1246 | c = scm_getc_unlocked (port); |
493ceb99 MW |
1247 | } |
1248 | if (tag_len == 0) | |
1249 | tag = SCM_BOOL_T; | |
b131b233 | 1250 | else |
493ceb99 MW |
1251 | { |
1252 | tag = scm_string_to_symbol (scm_from_utf32_stringn (tag_buf, tag_len)); | |
1253 | if (tag_len == sizeof tag_buf / sizeof tag_buf[0]) | |
1254 | scm_i_input_error (NULL, port, "invalid array tag, starting with: ~a", | |
1255 | scm_list_1 (tag)); | |
1256 | } | |
1257 | ||
1258 | /* Read shape. */ | |
1259 | if (c == '@' || c == ':') | |
1260 | { | |
1261 | shape = SCM_EOL; | |
1262 | ||
1263 | do | |
1264 | { | |
1265 | ssize_t lbnd = 0, len = 0; | |
1266 | SCM s; | |
1267 | ||
1268 | if (c == '@') | |
1269 | { | |
fa980bcc | 1270 | c = scm_getc_unlocked (port); |
493ceb99 MW |
1271 | c = read_decimal_integer (port, c, &lbnd); |
1272 | } | |
1273 | ||
1274 | s = scm_from_ssize_t (lbnd); | |
1275 | ||
1276 | if (c == ':') | |
1277 | { | |
fa980bcc | 1278 | c = scm_getc_unlocked (port); |
493ceb99 MW |
1279 | c = read_decimal_integer (port, c, &len); |
1280 | if (len < 0) | |
1281 | scm_i_input_error (NULL, port, | |
1282 | "array length must be non-negative", | |
1283 | SCM_EOL); | |
1284 | ||
1285 | s = scm_list_2 (s, scm_from_ssize_t (lbnd+len-1)); | |
1286 | } | |
1287 | ||
1288 | shape = scm_cons (s, shape); | |
1289 | } while (c == '@' || c == ':'); | |
1290 | ||
1291 | shape = scm_reverse_x (shape, SCM_EOL); | |
1292 | } | |
1293 | ||
1294 | /* Read nested lists of elements. */ | |
1295 | if (c != '(') | |
1296 | scm_i_input_error (NULL, port, | |
1297 | "missing '(' in vector or array literal", | |
1298 | SCM_EOL); | |
b1b5433d | 1299 | elements = scm_read_sexp (c, port, opts); |
493ceb99 MW |
1300 | |
1301 | if (scm_is_false (shape)) | |
1302 | shape = scm_from_ssize_t (rank); | |
1303 | else if (scm_ilength (shape) != rank) | |
1304 | scm_i_input_error | |
1305 | (NULL, port, | |
1306 | "the number of shape specifications must match the array rank", | |
1307 | SCM_EOL); | |
1308 | ||
1309 | /* Handle special print syntax of rank zero arrays; see | |
1310 | scm_i_print_array for a rationale. */ | |
1311 | if (rank == 0) | |
1312 | { | |
1313 | if (!scm_is_pair (elements)) | |
1314 | scm_i_input_error (NULL, port, | |
1315 | "too few elements in array literal, need 1", | |
1316 | SCM_EOL); | |
1317 | if (!scm_is_null (SCM_CDR (elements))) | |
1318 | scm_i_input_error (NULL, port, | |
1319 | "too many elements in array literal, want 1", | |
1320 | SCM_EOL); | |
1321 | elements = SCM_CAR (elements); | |
1322 | } | |
1323 | ||
1324 | /* Construct array, annotate with source location, and return. */ | |
1325 | array = scm_list_to_typed_array (tag, shape, elements); | |
b1b5433d | 1326 | return maybe_annotate_source (array, port, opts, line, column); |
7337d56d LC |
1327 | } |
1328 | ||
0ba0b384 | 1329 | static SCM |
b1b5433d MW |
1330 | scm_read_srfi4_vector (int chr, SCM port, scm_t_read_opts *opts, |
1331 | long line, int column) | |
7337d56d | 1332 | { |
b1b5433d | 1333 | return scm_read_array (chr, port, opts, line, column); |
7337d56d LC |
1334 | } |
1335 | ||
0ba0b384 | 1336 | static SCM |
b1b5433d MW |
1337 | scm_read_bytevector (scm_t_wchar chr, SCM port, scm_t_read_opts *opts, |
1338 | long line, int column) | |
0ba0b384 | 1339 | { |
be632904 | 1340 | chr = scm_getc_unlocked (port); |
0ba0b384 LC |
1341 | if (chr != 'u') |
1342 | goto syntax; | |
1343 | ||
be632904 | 1344 | chr = scm_getc_unlocked (port); |
0ba0b384 LC |
1345 | if (chr != '8') |
1346 | goto syntax; | |
1347 | ||
be632904 | 1348 | chr = scm_getc_unlocked (port); |
0ba0b384 LC |
1349 | if (chr != '(') |
1350 | goto syntax; | |
1351 | ||
b131b233 | 1352 | return maybe_annotate_source |
b1b5433d MW |
1353 | (scm_u8_list_to_bytevector (scm_read_sexp (chr, port, opts)), |
1354 | port, opts, line, column); | |
0ba0b384 LC |
1355 | |
1356 | syntax: | |
1357 | scm_i_input_error ("read_bytevector", port, | |
1358 | "invalid bytevector prefix", | |
1359 | SCM_MAKE_CHAR (chr)); | |
1360 | return SCM_UNSPECIFIED; | |
1361 | } | |
1362 | ||
7337d56d | 1363 | static SCM |
b1b5433d MW |
1364 | scm_read_guile_bit_vector (scm_t_wchar chr, SCM port, scm_t_read_opts *opts, |
1365 | long line, int column) | |
7337d56d LC |
1366 | { |
1367 | /* Read the `#*10101'-style read syntax for bit vectors in Guile. This is | |
1368 | terribly inefficient but who cares? */ | |
1369 | SCM s_bits = SCM_EOL; | |
1370 | ||
be632904 | 1371 | for (chr = scm_getc_unlocked (port); |
7337d56d | 1372 | (chr != EOF) && ((chr == '0') || (chr == '1')); |
be632904 | 1373 | chr = scm_getc_unlocked (port)) |
09a4f039 | 1374 | { |
7337d56d | 1375 | s_bits = scm_cons ((chr == '0') ? SCM_BOOL_F : SCM_BOOL_T, s_bits); |
09a4f039 | 1376 | } |
7337d56d LC |
1377 | |
1378 | if (chr != EOF) | |
c932ce0b | 1379 | scm_ungetc_unlocked (chr, port); |
7337d56d | 1380 | |
b131b233 MW |
1381 | return maybe_annotate_source |
1382 | (scm_bitvector (scm_reverse_x (s_bits, SCM_EOL)), | |
b1b5433d | 1383 | port, opts, line, column); |
7337d56d LC |
1384 | } |
1385 | ||
cfd15439 | 1386 | static SCM |
889975e5 | 1387 | scm_read_scsh_block_comment (scm_t_wchar chr, SCM port) |
7337d56d LC |
1388 | { |
1389 | int bang_seen = 0; | |
1390 | ||
1391 | for (;;) | |
09a4f039 | 1392 | { |
be632904 | 1393 | int c = scm_getc_unlocked (port); |
62850ef3 | 1394 | |
7337d56d LC |
1395 | if (c == EOF) |
1396 | scm_i_input_error ("skip_block_comment", port, | |
1397 | "unterminated `#! ... !#' comment", SCM_EOL); | |
1398 | ||
1399 | if (c == '!') | |
1400 | bang_seen = 1; | |
1401 | else if (c == '#' && bang_seen) | |
1402 | break; | |
1403 | else | |
1404 | bang_seen = 0; | |
1405 | } | |
1406 | ||
1407 | return SCM_UNSPECIFIED; | |
1408 | } | |
1409 | ||
9331ffd8 MW |
1410 | static void set_port_case_insensitive_p (SCM port, scm_t_read_opts *opts, |
1411 | int value); | |
bf9eb54a MW |
1412 | static void set_port_square_brackets_p (SCM port, scm_t_read_opts *opts, |
1413 | int value); | |
1414 | static void set_port_curly_infix_p (SCM port, scm_t_read_opts *opts, | |
1415 | int value); | |
9331ffd8 | 1416 | |
d7fcaec3 | 1417 | static SCM |
b1b5433d | 1418 | scm_read_shebang (scm_t_wchar chr, SCM port, scm_t_read_opts *opts) |
911b03b2 | 1419 | { |
02327c0c MW |
1420 | char name[READER_DIRECTIVE_NAME_MAX_SIZE + 1]; |
1421 | int c; | |
1422 | int i = 0; | |
1423 | ||
1424 | while (i <= READER_DIRECTIVE_NAME_MAX_SIZE) | |
911b03b2 | 1425 | { |
fa980bcc | 1426 | c = scm_getc_unlocked (port); |
02327c0c MW |
1427 | if (c == EOF) |
1428 | scm_i_input_error ("skip_block_comment", port, | |
1429 | "unterminated `#! ... !#' comment", SCM_EOL); | |
1430 | else if (('a' <= c && c <= 'z') || ('0' <= c && c <= '9') || c == '-') | |
1431 | name[i++] = c; | |
1432 | else if (CHAR_IS_DELIMITER (c)) | |
1433 | { | |
fa980bcc | 1434 | scm_ungetc_unlocked (c, port); |
02327c0c MW |
1435 | name[i] = '\0'; |
1436 | if (0 == strcmp ("r6rs", name)) | |
1437 | ; /* Silently ignore */ | |
9331ffd8 MW |
1438 | else if (0 == strcmp ("fold-case", name)) |
1439 | set_port_case_insensitive_p (port, opts, 1); | |
1440 | else if (0 == strcmp ("no-fold-case", name)) | |
1441 | set_port_case_insensitive_p (port, opts, 0); | |
bf9eb54a MW |
1442 | else if (0 == strcmp ("curly-infix", name)) |
1443 | set_port_curly_infix_p (port, opts, 1); | |
1444 | else if (0 == strcmp ("curly-infix-and-bracket-lists", name)) | |
1445 | { | |
1446 | set_port_curly_infix_p (port, opts, 1); | |
1447 | set_port_square_brackets_p (port, opts, 0); | |
1448 | } | |
02327c0c MW |
1449 | else |
1450 | break; | |
1451 | ||
1452 | return SCM_UNSPECIFIED; | |
1453 | } | |
fa746547 MW |
1454 | else |
1455 | { | |
fa980bcc | 1456 | scm_ungetc_unlocked (c, port); |
fa746547 MW |
1457 | break; |
1458 | } | |
911b03b2 | 1459 | } |
02327c0c | 1460 | while (i > 0) |
fa980bcc | 1461 | scm_ungetc_unlocked (name[--i], port); |
02327c0c | 1462 | return scm_read_scsh_block_comment (chr, port); |
911b03b2 JG |
1463 | } |
1464 | ||
620c8965 LC |
1465 | static SCM |
1466 | scm_read_r6rs_block_comment (scm_t_wchar chr, SCM port) | |
1467 | { | |
1468 | /* Unlike SCSH-style block comments, SRFI-30/R6RS block comments may be | |
1469 | nested. So care must be taken. */ | |
1470 | int nesting_level = 1; | |
6d5f8c32 | 1471 | |
be632904 | 1472 | int a = scm_getc_unlocked (port); |
6d5f8c32 AW |
1473 | |
1474 | if (a == EOF) | |
1475 | scm_i_input_error ("scm_read_r6rs_block_comment", port, | |
1476 | "unterminated `#| ... |#' comment", SCM_EOL); | |
620c8965 LC |
1477 | |
1478 | while (nesting_level > 0) | |
1479 | { | |
be632904 | 1480 | int b = scm_getc_unlocked (port); |
620c8965 | 1481 | |
6d5f8c32 | 1482 | if (b == EOF) |
cd169c5a | 1483 | scm_i_input_error ("scm_read_r6rs_block_comment", port, |
620c8965 LC |
1484 | "unterminated `#| ... |#' comment", SCM_EOL); |
1485 | ||
6d5f8c32 AW |
1486 | if (a == '|' && b == '#') |
1487 | { | |
1488 | nesting_level--; | |
1489 | b = EOF; | |
1490 | } | |
1491 | else if (a == '#' && b == '|') | |
1492 | { | |
1493 | nesting_level++; | |
1494 | b = EOF; | |
1495 | } | |
1496 | ||
1497 | a = b; | |
620c8965 LC |
1498 | } |
1499 | ||
1500 | return SCM_UNSPECIFIED; | |
1501 | } | |
1502 | ||
34f3d47d | 1503 | static SCM |
b1b5433d MW |
1504 | scm_read_commented_expression (scm_t_wchar chr, SCM port, |
1505 | scm_t_read_opts *opts) | |
34f3d47d | 1506 | { |
889975e5 | 1507 | scm_t_wchar c; |
34f3d47d | 1508 | |
b1b5433d | 1509 | c = flush_ws (port, opts, (char *) NULL); |
34f3d47d AW |
1510 | if (EOF == c) |
1511 | scm_i_input_error ("read_commented_expression", port, | |
1512 | "no expression after #; comment", SCM_EOL); | |
c932ce0b | 1513 | scm_ungetc_unlocked (c, port); |
b1b5433d | 1514 | scm_read_expression (port, opts); |
34f3d47d AW |
1515 | return SCM_UNSPECIFIED; |
1516 | } | |
1517 | ||
7337d56d | 1518 | static SCM |
889975e5 | 1519 | scm_read_extended_symbol (scm_t_wchar chr, SCM port) |
7337d56d LC |
1520 | { |
1521 | /* Guile's extended symbol read syntax looks like this: | |
1522 | ||
1523 | #{This is all a symbol name}# | |
1524 | ||
1525 | So here, CHR is expected to be `{'. */ | |
d9527cfa | 1526 | int saw_brace = 0; |
7337d56d | 1527 | size_t len = 0; |
190d4b0d | 1528 | SCM buf = scm_i_make_string (1024, NULL, 0); |
7337d56d | 1529 | |
889975e5 | 1530 | buf = scm_i_string_start_writing (buf); |
7337d56d | 1531 | |
be632904 | 1532 | while ((chr = scm_getc_unlocked (port)) != EOF) |
7337d56d LC |
1533 | { |
1534 | if (saw_brace) | |
09a4f039 | 1535 | { |
7337d56d LC |
1536 | if (chr == '#') |
1537 | { | |
7337d56d LC |
1538 | break; |
1539 | } | |
1540 | else | |
1541 | { | |
1542 | saw_brace = 0; | |
889975e5 | 1543 | scm_i_string_set_x (buf, len++, '}'); |
7337d56d | 1544 | } |
09a4f039 | 1545 | } |
d9527cfa AW |
1546 | |
1547 | if (chr == '}') | |
7337d56d | 1548 | saw_brace = 1; |
d9527cfa AW |
1549 | else if (chr == '\\') |
1550 | { | |
1551 | /* It used to be that print.c would print extended-read-syntax | |
1552 | symbols with backslashes before "non-standard" chars, but | |
1553 | this routine wouldn't do anything with those escapes. | |
1554 | Bummer. What we've done is to change print.c to output | |
1555 | R6RS hex escapes for those characters, relying on the fact | |
1556 | that the extended read syntax would never put a `\' before | |
1557 | an `x'. For now, we just ignore other instances of | |
1558 | backslash in the string. */ | |
be632904 | 1559 | switch ((chr = scm_getc_unlocked (port))) |
d9527cfa AW |
1560 | { |
1561 | case EOF: | |
1562 | goto done; | |
1563 | case 'x': | |
1564 | { | |
1565 | scm_t_wchar c; | |
1566 | ||
1567 | SCM_READ_HEX_ESCAPE (10, ';'); | |
1568 | scm_i_string_set_x (buf, len++, c); | |
1569 | break; | |
1570 | ||
1571 | str_eof: | |
1572 | chr = EOF; | |
1573 | goto done; | |
1574 | ||
1575 | bad_escaped: | |
1576 | scm_i_string_stop_writing (); | |
1577 | scm_i_input_error ("scm_read_extended_symbol", port, | |
1578 | "illegal character in escape sequence: ~S", | |
1579 | scm_list_1 (SCM_MAKE_CHAR (c))); | |
1580 | break; | |
1581 | } | |
1582 | default: | |
1583 | scm_i_string_set_x (buf, len++, chr); | |
1584 | break; | |
1585 | } | |
1586 | } | |
7337d56d | 1587 | else |
d9527cfa | 1588 | scm_i_string_set_x (buf, len++, chr); |
62850ef3 | 1589 | |
889975e5 | 1590 | if (len >= scm_i_string_length (buf) - 2) |
7337d56d | 1591 | { |
7f991c7d LC |
1592 | SCM addy; |
1593 | ||
889975e5 | 1594 | scm_i_string_stop_writing (); |
190d4b0d | 1595 | addy = scm_i_make_string (1024, NULL, 0); |
889975e5 | 1596 | buf = scm_string_append (scm_list_2 (buf, addy)); |
7337d56d | 1597 | len = 0; |
889975e5 | 1598 | buf = scm_i_string_start_writing (buf); |
7337d56d | 1599 | } |
7337d56d | 1600 | } |
d9527cfa AW |
1601 | |
1602 | done: | |
889975e5 | 1603 | scm_i_string_stop_writing (); |
d9527cfa AW |
1604 | if (chr == EOF) |
1605 | scm_i_input_error ("scm_read_extended_symbol", port, | |
1606 | "end of file while reading symbol", SCM_EOL); | |
7337d56d | 1607 | |
889975e5 | 1608 | return (scm_string_to_symbol (scm_c_substring (buf, 0, len))); |
7337d56d LC |
1609 | } |
1610 | ||
1611 | ||
1612 | \f | |
1613 | /* Top-level token readers, i.e., dispatchers. */ | |
1614 | ||
1615 | static SCM | |
b1b5433d | 1616 | scm_read_sharp_extension (int chr, SCM port, scm_t_read_opts *opts) |
7337d56d LC |
1617 | { |
1618 | SCM proc; | |
1619 | ||
1620 | proc = scm_get_hash_procedure (chr); | |
1621 | if (scm_is_true (scm_procedure_p (proc))) | |
1622 | { | |
1623 | long line = SCM_LINUM (port); | |
1624 | int column = SCM_COL (port) - 2; | |
1625 | SCM got; | |
1626 | ||
1627 | got = scm_call_2 (proc, SCM_MAKE_CHAR (chr), port); | |
26c8cc14 | 1628 | |
3655ed89 MW |
1629 | if (opts->record_positions_p && SCM_NIMP (got) |
1630 | && !scm_i_has_source_properties (got)) | |
26c8cc14 AW |
1631 | scm_i_set_source_properties_x (got, line, column, SCM_FILENAME (port)); |
1632 | ||
1633 | return got; | |
09a4f039 | 1634 | } |
7337d56d LC |
1635 | |
1636 | return SCM_UNSPECIFIED; | |
1637 | } | |
1638 | ||
1639 | /* The reader for the sharp `#' character. It basically dispatches reads | |
1640 | among the above token readers. */ | |
1641 | static SCM | |
b1b5433d MW |
1642 | scm_read_sharp (scm_t_wchar chr, SCM port, scm_t_read_opts *opts, |
1643 | long line, int column) | |
7337d56d LC |
1644 | #define FUNC_NAME "scm_lreadr" |
1645 | { | |
1646 | SCM result; | |
1647 | ||
be632904 | 1648 | chr = scm_getc_unlocked (port); |
7337d56d | 1649 | |
b1b5433d | 1650 | result = scm_read_sharp_extension (chr, port, opts); |
7337d56d LC |
1651 | if (!scm_is_eq (result, SCM_UNSPECIFIED)) |
1652 | return result; | |
1653 | ||
1654 | switch (chr) | |
1655 | { | |
1656 | case '\\': | |
b1b5433d | 1657 | return (scm_read_character (chr, port, opts)); |
7337d56d | 1658 | case '(': |
b1b5433d | 1659 | return (scm_read_vector (chr, port, opts, line, column)); |
7337d56d LC |
1660 | case 's': |
1661 | case 'u': | |
1662 | case 'f': | |
df941b5b | 1663 | case 'c': |
7337d56d | 1664 | /* This one may return either a boolean or an SRFI-4 vector. */ |
b1b5433d | 1665 | return (scm_read_srfi4_vector (chr, port, opts, line, column)); |
0ba0b384 | 1666 | case 'v': |
b1b5433d | 1667 | return (scm_read_bytevector (chr, port, opts, line, column)); |
7337d56d | 1668 | case '*': |
b1b5433d | 1669 | return (scm_read_guile_bit_vector (chr, port, opts, line, column)); |
7337d56d LC |
1670 | case 't': |
1671 | case 'T': | |
1672 | case 'F': | |
7337d56d LC |
1673 | return (scm_read_boolean (chr, port)); |
1674 | case ':': | |
b1b5433d | 1675 | return (scm_read_keyword (chr, port, opts)); |
7337d56d LC |
1676 | case '0': case '1': case '2': case '3': case '4': |
1677 | case '5': case '6': case '7': case '8': case '9': | |
1678 | case '@': | |
b1b5433d | 1679 | return (scm_read_array (chr, port, opts, line, column)); |
7337d56d LC |
1680 | |
1681 | case 'i': | |
1682 | case 'e': | |
7337d56d LC |
1683 | case 'b': |
1684 | case 'B': | |
1685 | case 'o': | |
1686 | case 'O': | |
1687 | case 'd': | |
1688 | case 'D': | |
1689 | case 'x': | |
1690 | case 'X': | |
1691 | case 'I': | |
1692 | case 'E': | |
b1b5433d | 1693 | return (scm_read_number_and_radix (chr, port, opts)); |
7337d56d LC |
1694 | case '{': |
1695 | return (scm_read_extended_symbol (chr, port)); | |
1696 | case '!': | |
b1b5433d | 1697 | return (scm_read_shebang (chr, port, opts)); |
34f3d47d | 1698 | case ';': |
b1b5433d | 1699 | return (scm_read_commented_expression (chr, port, opts)); |
34f3d47d AW |
1700 | case '`': |
1701 | case '\'': | |
1702 | case ',': | |
b1b5433d | 1703 | return (scm_read_syntax (chr, port, opts)); |
7c4aad9c | 1704 | case 'n': |
b1b5433d | 1705 | return (scm_read_nil (chr, port, opts)); |
7337d56d | 1706 | default: |
b1b5433d | 1707 | result = scm_read_sharp_extension (chr, port, opts); |
7337d56d | 1708 | if (scm_is_eq (result, SCM_UNSPECIFIED)) |
620c8965 LC |
1709 | { |
1710 | /* To remain compatible with 1.8 and earlier, the following | |
1711 | characters have lower precedence than `read-hash-extend' | |
1712 | characters. */ | |
1713 | switch (chr) | |
1714 | { | |
1715 | case '|': | |
1716 | return scm_read_r6rs_block_comment (chr, port); | |
1717 | default: | |
1718 | scm_i_input_error (FUNC_NAME, port, "Unknown # object: ~S", | |
1719 | scm_list_1 (SCM_MAKE_CHAR (chr))); | |
1720 | } | |
1721 | } | |
7337d56d LC |
1722 | else |
1723 | return result; | |
1724 | } | |
1725 | ||
1726 | return SCM_UNSPECIFIED; | |
1727 | } | |
1728 | #undef FUNC_NAME | |
1729 | ||
1730 | static SCM | |
bf9eb54a MW |
1731 | read_inner_expression (SCM port, scm_t_read_opts *opts) |
1732 | #define FUNC_NAME "read_inner_expression" | |
7337d56d LC |
1733 | { |
1734 | while (1) | |
1735 | { | |
cfd15439 | 1736 | scm_t_wchar chr; |
7337d56d | 1737 | |
be632904 | 1738 | chr = scm_getc_unlocked (port); |
7337d56d LC |
1739 | |
1740 | switch (chr) | |
1741 | { | |
1742 | case SCM_WHITE_SPACES: | |
1743 | case SCM_LINE_INCREMENTORS: | |
1744 | break; | |
1745 | case ';': | |
1746 | (void) scm_read_semicolon_comment (chr, port); | |
1747 | break; | |
bf9eb54a MW |
1748 | case '{': |
1749 | if (opts->curly_infix_p) | |
1750 | { | |
1751 | if (opts->neoteric_p) | |
1752 | return scm_read_sexp (chr, port, opts); | |
1753 | else | |
1754 | { | |
1755 | SCM expr; | |
1756 | ||
1757 | /* Enable neoteric expressions within curly braces */ | |
1758 | opts->neoteric_p = 1; | |
1759 | expr = scm_read_sexp (chr, port, opts); | |
1760 | opts->neoteric_p = 0; | |
1761 | return expr; | |
1762 | } | |
1763 | } | |
1764 | else | |
1765 | return scm_read_mixed_case_symbol (chr, port, opts); | |
5afa815c | 1766 | case '[': |
bf9eb54a MW |
1767 | if (opts->square_brackets_p) |
1768 | return scm_read_sexp (chr, port, opts); | |
1769 | else if (opts->curly_infix_p) | |
1770 | { | |
1771 | /* The syntax of neoteric expressions requires that '[' be | |
1772 | a delimiter when curly-infix is enabled, so it cannot | |
1773 | be part of an unescaped symbol. We might as well do | |
1774 | something useful with it, so we adopt Kawa's convention: | |
1775 | [...] => ($bracket-list$ ...) */ | |
1776 | long line = SCM_LINUM (port); | |
1777 | int column = SCM_COL (port) - 1; | |
1778 | return maybe_annotate_source | |
1779 | (scm_cons (sym_bracket_list, scm_read_sexp (chr, port, opts)), | |
1780 | port, opts, line, column); | |
1781 | } | |
1782 | else | |
1783 | return scm_read_mixed_case_symbol (chr, port, opts); | |
7337d56d | 1784 | case '(': |
b1b5433d | 1785 | return (scm_read_sexp (chr, port, opts)); |
7337d56d | 1786 | case '"': |
b1b5433d | 1787 | return (scm_read_string (chr, port, opts)); |
dc59631d MW |
1788 | case '|': |
1789 | if (opts->r7rs_symbols_p) | |
1790 | return scm_read_r7rs_symbol (chr, port, opts); | |
1791 | else | |
1792 | return scm_read_mixed_case_symbol (chr, port, opts); | |
7337d56d LC |
1793 | case '\'': |
1794 | case '`': | |
1795 | case ',': | |
b1b5433d | 1796 | return (scm_read_quote (chr, port, opts)); |
7337d56d LC |
1797 | case '#': |
1798 | { | |
b131b233 MW |
1799 | long line = SCM_LINUM (port); |
1800 | int column = SCM_COL (port) - 1; | |
b1b5433d | 1801 | SCM result = scm_read_sharp (chr, port, opts, line, column); |
7337d56d LC |
1802 | if (scm_is_eq (result, SCM_UNSPECIFIED)) |
1803 | /* We read a comment or some such. */ | |
1804 | break; | |
1805 | else | |
1806 | return result; | |
1807 | } | |
1808 | case ')': | |
1809 | scm_i_input_error (FUNC_NAME, port, "unexpected \")\"", SCM_EOL); | |
1810 | break; | |
bf9eb54a MW |
1811 | case '}': |
1812 | if (opts->curly_infix_p) | |
1813 | scm_i_input_error (FUNC_NAME, port, "unexpected \"}\"", SCM_EOL); | |
1814 | else | |
1815 | return scm_read_mixed_case_symbol (chr, port, opts); | |
a4e47229 | 1816 | case ']': |
b1b5433d | 1817 | if (opts->square_brackets_p) |
a4e47229 MG |
1818 | scm_i_input_error (FUNC_NAME, port, "unexpected \"]\"", SCM_EOL); |
1819 | /* otherwise fall through */ | |
7337d56d LC |
1820 | case EOF: |
1821 | return SCM_EOF_VAL; | |
1822 | case ':': | |
b1b5433d MW |
1823 | if (opts->keyword_style == KEYWORD_STYLE_PREFIX) |
1824 | return scm_symbol_to_keyword (scm_read_expression (port, opts)); | |
7337d56d LC |
1825 | /* Fall through. */ |
1826 | ||
1827 | default: | |
1828 | { | |
1829 | if (((chr >= '0') && (chr <= '9')) | |
1830 | || (strchr ("+-.", chr))) | |
b1b5433d | 1831 | return (scm_read_number (chr, port, opts)); |
7337d56d | 1832 | else |
b1b5433d | 1833 | return (scm_read_mixed_case_symbol (chr, port, opts)); |
7337d56d LC |
1834 | } |
1835 | } | |
1836 | } | |
1837 | } | |
1838 | #undef FUNC_NAME | |
1839 | ||
bf9eb54a MW |
1840 | static SCM |
1841 | scm_read_expression (SCM port, scm_t_read_opts *opts) | |
1842 | #define FUNC_NAME "scm_read_expression" | |
1843 | { | |
1844 | if (!opts->neoteric_p) | |
1845 | return read_inner_expression (port, opts); | |
1846 | else | |
1847 | { | |
1848 | long line = 0; | |
1849 | int column = 0; | |
1850 | SCM expr; | |
1851 | ||
1852 | if (opts->record_positions_p) | |
1853 | { | |
1854 | /* We need to get the position of the first non-whitespace | |
1855 | character in order to correctly annotate neoteric | |
1856 | expressions. For example, for the expression 'f(x)', the | |
1857 | first call to 'read_inner_expression' reads the 'f' (which | |
1858 | cannot be annotated), and then we later read the '(x)' and | |
1859 | use it to construct the new list (f x). */ | |
1860 | int c = flush_ws (port, opts, (char *) NULL); | |
1861 | if (c == EOF) | |
1862 | return SCM_EOF_VAL; | |
fa980bcc | 1863 | scm_ungetc_unlocked (c, port); |
bf9eb54a MW |
1864 | line = SCM_LINUM (port); |
1865 | column = SCM_COL (port); | |
1866 | } | |
1867 | ||
1868 | expr = read_inner_expression (port, opts); | |
1869 | ||
1870 | /* 'expr' is the first component of the neoteric expression. Now | |
1871 | we loop, and as long as the next character is '(', '[', or '{', | |
1872 | (without any intervening whitespace), we use it to construct a | |
1873 | new expression. For example, f{n - 1}(x) => ((f (- n 1)) x). */ | |
1874 | for (;;) | |
1875 | { | |
fa980bcc | 1876 | int chr = scm_getc_unlocked (port); |
bf9eb54a MW |
1877 | |
1878 | if (chr == '(') | |
1879 | /* e(...) => (e ...) */ | |
1880 | expr = scm_cons (expr, scm_read_sexp (chr, port, opts)); | |
1881 | else if (chr == '[') | |
1882 | /* e[...] => ($bracket-apply$ e ...) */ | |
1883 | expr = scm_cons (sym_bracket_apply, | |
1884 | scm_cons (expr, | |
1885 | scm_read_sexp (chr, port, opts))); | |
1886 | else if (chr == '{') | |
1887 | { | |
1888 | SCM arg = scm_read_sexp (chr, port, opts); | |
1889 | ||
1890 | if (scm_is_null (arg)) | |
1891 | expr = scm_list_1 (expr); /* e{} => (e) */ | |
1892 | else | |
1893 | expr = scm_list_2 (expr, arg); /* e{...} => (e {...}) */ | |
1894 | } | |
1895 | else | |
1896 | { | |
1897 | if (chr != EOF) | |
fa980bcc | 1898 | scm_ungetc_unlocked (chr, port); |
bf9eb54a MW |
1899 | break; |
1900 | } | |
1901 | maybe_annotate_source (expr, port, opts, line, column); | |
1902 | } | |
1903 | return expr; | |
1904 | } | |
1905 | } | |
1906 | #undef FUNC_NAME | |
1907 | ||
7337d56d LC |
1908 | \f |
1909 | /* Actual reader. */ | |
1910 | ||
ea8c9761 MW |
1911 | static void init_read_options (SCM port, scm_t_read_opts *opts); |
1912 | ||
7337d56d LC |
1913 | SCM_DEFINE (scm_read, "read", 0, 1, 0, |
1914 | (SCM port), | |
1915 | "Read an s-expression from the input port @var{port}, or from\n" | |
1916 | "the current input port if @var{port} is not specified.\n" | |
1917 | "Any whitespace before the next token is discarded.") | |
1918 | #define FUNC_NAME s_scm_read | |
1919 | { | |
b1b5433d | 1920 | scm_t_read_opts opts; |
7337d56d LC |
1921 | int c; |
1922 | ||
1923 | if (SCM_UNBNDP (port)) | |
1924 | port = scm_current_input_port (); | |
1925 | SCM_VALIDATE_OPINPORT (1, port); | |
1926 | ||
ea8c9761 | 1927 | init_read_options (port, &opts); |
b1b5433d MW |
1928 | |
1929 | c = flush_ws (port, &opts, (char *) NULL); | |
7337d56d LC |
1930 | if (EOF == c) |
1931 | return SCM_EOF_VAL; | |
c932ce0b | 1932 | scm_ungetc_unlocked (c, port); |
7337d56d | 1933 | |
b1b5433d | 1934 | return (scm_read_expression (port, &opts)); |
09a4f039 | 1935 | } |
db4b4ca6 | 1936 | #undef FUNC_NAME |
09a4f039 | 1937 | |
0f2d19dd JB |
1938 | |
1939 | \f | |
1940 | ||
14de3b42 GH |
1941 | /* Manipulate the read-hash-procedures alist. This could be written in |
1942 | Scheme, but maybe it will also be used by C code during initialisation. */ | |
a1ec6916 | 1943 | SCM_DEFINE (scm_read_hash_extend, "read-hash-extend", 2, 0, 0, |
1bbd0b84 | 1944 | (SCM chr, SCM proc), |
dc7fa443 MG |
1945 | "Install the procedure @var{proc} for reading expressions\n" |
1946 | "starting with the character sequence @code{#} and @var{chr}.\n" | |
1947 | "@var{proc} will be called with two arguments: the character\n" | |
1948 | "@var{chr} and the port to read further data from. The object\n" | |
391f57e6 HWN |
1949 | "returned will be the return value of @code{read}. \n" |
1950 | "Passing @code{#f} for @var{proc} will remove a previous setting. \n" | |
1951 | ) | |
1bbd0b84 | 1952 | #define FUNC_NAME s_scm_read_hash_extend |
deca31e1 | 1953 | { |
fed9c9a2 GH |
1954 | SCM this; |
1955 | SCM prev; | |
1956 | ||
36284627 | 1957 | SCM_VALIDATE_CHAR (1, chr); |
7888309b | 1958 | SCM_ASSERT (scm_is_false (proc) |
bc36d050 | 1959 | || scm_is_eq (scm_procedure_p (proc), SCM_BOOL_T), |
36284627 | 1960 | proc, SCM_ARG2, FUNC_NAME); |
fed9c9a2 | 1961 | |
14de3b42 | 1962 | /* Check if chr is already in the alist. */ |
d458073b | 1963 | this = scm_i_read_hash_procedures_ref (); |
14de3b42 | 1964 | prev = SCM_BOOL_F; |
fed9c9a2 GH |
1965 | while (1) |
1966 | { | |
d2e53ed6 | 1967 | if (scm_is_null (this)) |
fed9c9a2 GH |
1968 | { |
1969 | /* not found, so add it to the beginning. */ | |
7888309b | 1970 | if (scm_is_true (proc)) |
fed9c9a2 | 1971 | { |
d458073b AR |
1972 | SCM new = scm_cons (scm_cons (chr, proc), |
1973 | scm_i_read_hash_procedures_ref ()); | |
1974 | scm_i_read_hash_procedures_set_x (new); | |
fed9c9a2 GH |
1975 | } |
1976 | break; | |
1977 | } | |
bc36d050 | 1978 | if (scm_is_eq (chr, SCM_CAAR (this))) |
fed9c9a2 GH |
1979 | { |
1980 | /* already in the alist. */ | |
7888309b | 1981 | if (scm_is_false (proc)) |
14de3b42 GH |
1982 | { |
1983 | /* remove it. */ | |
7888309b | 1984 | if (scm_is_false (prev)) |
14de3b42 | 1985 | { |
d458073b AR |
1986 | SCM rest = SCM_CDR (scm_i_read_hash_procedures_ref ()); |
1987 | scm_i_read_hash_procedures_set_x (rest); | |
14de3b42 GH |
1988 | } |
1989 | else | |
1990 | scm_set_cdr_x (prev, SCM_CDR (this)); | |
1991 | } | |
fed9c9a2 | 1992 | else |
14de3b42 GH |
1993 | { |
1994 | /* replace it. */ | |
1995 | scm_set_cdr_x (SCM_CAR (this), proc); | |
1996 | } | |
fed9c9a2 GH |
1997 | break; |
1998 | } | |
1999 | prev = this; | |
2000 | this = SCM_CDR (this); | |
2001 | } | |
deca31e1 | 2002 | |
deca31e1 GH |
2003 | return SCM_UNSPECIFIED; |
2004 | } | |
1bbd0b84 | 2005 | #undef FUNC_NAME |
0f2d19dd | 2006 | |
deca31e1 GH |
2007 | /* Recover the read-hash procedure corresponding to char c. */ |
2008 | static SCM | |
6e8d25a6 | 2009 | scm_get_hash_procedure (int c) |
deca31e1 | 2010 | { |
d458073b | 2011 | SCM rest = scm_i_read_hash_procedures_ref (); |
fed9c9a2 | 2012 | |
deca31e1 GH |
2013 | while (1) |
2014 | { | |
d2e53ed6 | 2015 | if (scm_is_null (rest)) |
deca31e1 GH |
2016 | return SCM_BOOL_F; |
2017 | ||
7866a09b | 2018 | if (SCM_CHAR (SCM_CAAR (rest)) == c) |
deca31e1 GH |
2019 | return SCM_CDAR (rest); |
2020 | ||
2021 | rest = SCM_CDR (rest); | |
2022 | } | |
2023 | } | |
1cc91f1b | 2024 | |
93c4fa21 AW |
2025 | static int |
2026 | is_encoding_char (char c) | |
2027 | { | |
2028 | if (c >= 'a' && c <= 'z') return 1; | |
2029 | if (c >= 'A' && c <= 'Z') return 1; | |
2030 | if (c >= '0' && c <= '9') return 1; | |
2031 | return strchr ("_-.:/,+=()", c) != NULL; | |
2032 | } | |
2033 | ||
3ff8a9d6 LC |
2034 | /* Maximum size of an encoding name. This is a bit more than the |
2035 | longest name listed at | |
2036 | <http://www.iana.org/assignments/character-sets> ("ISO-2022-JP-2", 13 | |
2037 | characters.) */ | |
2038 | #define ENCODING_NAME_MAX_SIZE 20 | |
889975e5 | 2039 | |
3ff8a9d6 LC |
2040 | /* Number of bytes at the beginning or end of a file that are scanned |
2041 | for a "coding:" declaration. */ | |
2042 | #define SCM_ENCODING_SEARCH_SIZE (500 + ENCODING_NAME_MAX_SIZE) | |
2043 | ||
2044 | ||
2045 | /* Search the SCM_ENCODING_SEARCH_SIZE bytes of a file for an Emacs-like | |
2046 | coding declaration. Returns either NULL or a string whose storage | |
2047 | has been allocated with `scm_gc_malloc'. */ | |
889975e5 | 2048 | char * |
f8a1c9a8 | 2049 | scm_i_scan_for_encoding (SCM port) |
889975e5 | 2050 | { |
d900843c | 2051 | scm_t_port *pt; |
889975e5 | 2052 | char header[SCM_ENCODING_SEARCH_SIZE+1]; |
daedbca7 | 2053 | size_t bytes_read, encoding_length, i; |
889975e5 | 2054 | char *encoding = NULL; |
daedbca7 | 2055 | char *pos, *encoding_start; |
889975e5 MG |
2056 | int in_comment; |
2057 | ||
d900843c | 2058 | pt = SCM_PTAB_ENTRY (port); |
49bb5bd3 | 2059 | |
d900843c | 2060 | if (pt->rw_active == SCM_PORT_WRITE) |
4251ae2e | 2061 | scm_flush_unlocked (port); |
49bb5bd3 | 2062 | |
d900843c AW |
2063 | if (pt->rw_random) |
2064 | pt->rw_active = SCM_PORT_READ; | |
2065 | ||
2066 | if (pt->read_pos == pt->read_end) | |
2067 | { | |
2068 | /* We can use the read buffer, and thus avoid a seek. */ | |
4251ae2e | 2069 | if (scm_fill_input_unlocked (port) == EOF) |
d900843c AW |
2070 | return NULL; |
2071 | ||
2072 | bytes_read = pt->read_end - pt->read_pos; | |
2073 | if (bytes_read > SCM_ENCODING_SEARCH_SIZE) | |
2074 | bytes_read = SCM_ENCODING_SEARCH_SIZE; | |
2075 | ||
2076 | if (bytes_read <= 1) | |
2077 | /* An unbuffered port -- don't scan. */ | |
2078 | return NULL; | |
2079 | ||
2080 | memcpy (header, pt->read_pos, bytes_read); | |
2081 | header[bytes_read] = '\0'; | |
2082 | } | |
2083 | else | |
2084 | { | |
2085 | /* Try to read some bytes and then seek back. Not all ports | |
2086 | support seeking back; and indeed some file ports (like | |
2087 | /dev/urandom) will succeed on an lseek (fd, 0, SEEK_CUR)---the | |
2088 | check performed by SCM_FPORT_FDES---but fail to seek | |
2089 | backwards. Hence this block comes second. We prefer to use | |
2090 | the read buffer in-place. */ | |
2091 | if (SCM_FPORTP (port) && !SCM_FDES_RANDOM_P (SCM_FPORT_FDES (port))) | |
2092 | return NULL; | |
2093 | ||
be632904 | 2094 | bytes_read = scm_c_read_unlocked (port, header, SCM_ENCODING_SEARCH_SIZE); |
d900843c AW |
2095 | header[bytes_read] = '\0'; |
2096 | scm_seek (port, scm_from_int (0), scm_from_int (SEEK_SET)); | |
2097 | } | |
889975e5 | 2098 | |
889975e5 MG |
2099 | /* search past "coding[:=]" */ |
2100 | pos = header; | |
2101 | while (1) | |
2102 | { | |
2103 | if ((pos = strstr(pos, "coding")) == NULL) | |
2104 | return NULL; | |
2105 | ||
3ff8a9d6 LC |
2106 | pos += strlen ("coding"); |
2107 | if (pos - header >= SCM_ENCODING_SEARCH_SIZE || | |
889975e5 MG |
2108 | (*pos == ':' || *pos == '=')) |
2109 | { | |
2110 | pos ++; | |
2111 | break; | |
2112 | } | |
2113 | } | |
2114 | ||
2115 | /* skip spaces */ | |
3ff8a9d6 | 2116 | while (pos - header <= SCM_ENCODING_SEARCH_SIZE && |
889975e5 MG |
2117 | (*pos == ' ' || *pos == '\t')) |
2118 | pos ++; | |
2119 | ||
3ff8a9d6 LC |
2120 | if (pos - header >= SCM_ENCODING_SEARCH_SIZE - ENCODING_NAME_MAX_SIZE) |
2121 | /* We found the "coding:" string, but there is probably not enough | |
2122 | room to store an encoding name in its entirety, so ignore it. | |
2123 | This makes sure we do not end up returning a truncated encoding | |
2124 | name. */ | |
2125 | return NULL; | |
2126 | ||
889975e5 | 2127 | /* grab the next token */ |
daedbca7 | 2128 | encoding_start = pos; |
889975e5 | 2129 | i = 0; |
daedbca7 MG |
2130 | while (encoding_start + i - header <= SCM_ENCODING_SEARCH_SIZE |
2131 | && encoding_start + i - header < bytes_read | |
93c4fa21 | 2132 | && is_encoding_char (encoding_start[i])) |
889975e5 MG |
2133 | i++; |
2134 | ||
daedbca7 MG |
2135 | encoding_length = i; |
2136 | if (encoding_length == 0) | |
889975e5 MG |
2137 | return NULL; |
2138 | ||
daedbca7 | 2139 | encoding = scm_gc_strndup (encoding_start, encoding_length, "encoding"); |
889975e5 MG |
2140 | |
2141 | /* push backwards to make sure we were in a comment */ | |
2142 | in_comment = 0; | |
daedbca7 MG |
2143 | pos = encoding_start; |
2144 | while (pos >= header) | |
889975e5 | 2145 | { |
8a12aeb9 AW |
2146 | if (*pos == ';') |
2147 | { | |
2148 | in_comment = 1; | |
2149 | break; | |
2150 | } | |
2151 | else if (*pos == '\n' || pos == header) | |
889975e5 MG |
2152 | { |
2153 | /* This wasn't in a semicolon comment. Check for a | |
2154 | hash-bang comment. */ | |
2155 | char *beg = strstr (header, "#!"); | |
2156 | char *end = strstr (header, "!#"); | |
8a12aeb9 | 2157 | if (beg < encoding_start && encoding_start + encoding_length <= end) |
889975e5 MG |
2158 | in_comment = 1; |
2159 | break; | |
2160 | } | |
8a12aeb9 AW |
2161 | else |
2162 | { | |
2163 | pos --; | |
2164 | continue; | |
2165 | } | |
889975e5 MG |
2166 | } |
2167 | if (!in_comment) | |
f8a1c9a8 LC |
2168 | /* This wasn't in a comment */ |
2169 | return NULL; | |
2170 | ||
889975e5 MG |
2171 | return encoding; |
2172 | } | |
2173 | ||
2174 | SCM_DEFINE (scm_file_encoding, "file-encoding", 1, 0, 0, | |
2175 | (SCM port), | |
a270e133 | 2176 | "Scans the port for an Emacs-like character coding declaration\n" |
ffb62a43 | 2177 | "near the top of the contents of a port with random-accessible contents.\n" |
889975e5 MG |
2178 | "The coding declaration is of the form\n" |
2179 | "@code{coding: XXXXX} and must appear in a scheme comment.\n" | |
2180 | "\n" | |
2181 | "Returns a string containing the character encoding of the file\n" | |
2182 | "if a declaration was found, or @code{#f} otherwise.\n") | |
2183 | #define FUNC_NAME s_scm_file_encoding | |
2184 | { | |
2185 | char *enc; | |
2186 | SCM s_enc; | |
f8a1c9a8 | 2187 | |
d900843c AW |
2188 | SCM_VALIDATE_OPINPORT (SCM_ARG1, port); |
2189 | ||
f8a1c9a8 | 2190 | enc = scm_i_scan_for_encoding (port); |
889975e5 MG |
2191 | if (enc == NULL) |
2192 | return SCM_BOOL_F; | |
2193 | else | |
2194 | { | |
f6f4feb0 | 2195 | s_enc = scm_string_upcase (scm_from_locale_string (enc)); |
889975e5 MG |
2196 | return s_enc; |
2197 | } | |
f8a1c9a8 | 2198 | |
889975e5 MG |
2199 | return SCM_BOOL_F; |
2200 | } | |
2201 | #undef FUNC_NAME | |
2202 | ||
ea8c9761 MW |
2203 | \f |
2204 | /* Per-port read options. | |
2205 | ||
a38024ba MW |
2206 | We store per-port read options in the 'port-read-options' port |
2207 | property, which is stored in the internal port structure. The value | |
2208 | stored is a single integer that contains a two-bit field for each | |
2209 | read option. | |
ea8c9761 MW |
2210 | |
2211 | If a bit field contains READ_OPTION_INHERIT (3), that indicates that | |
2212 | the applicable value should be inherited from the corresponding | |
2213 | global read option. Otherwise, the bit field contains the value of | |
2214 | the read option. For boolean read options that have been set | |
2215 | per-port, the possible values are 0 or 1. If the 'keyword_style' | |
2216 | read option has been set per-port, its possible values are those in | |
2217 | 'enum t_keyword_style'. */ | |
2218 | ||
a38024ba | 2219 | /* Key to read options in port properties. */ |
ea8c9761 MW |
2220 | SCM_SYMBOL (sym_port_read_options, "port-read-options"); |
2221 | ||
2222 | /* Offsets of bit fields for each per-port override */ | |
2223 | #define READ_OPTION_COPY_SOURCE_P 0 | |
2224 | #define READ_OPTION_RECORD_POSITIONS_P 2 | |
2225 | #define READ_OPTION_CASE_INSENSITIVE_P 4 | |
2226 | #define READ_OPTION_KEYWORD_STYLE 6 | |
2227 | #define READ_OPTION_R6RS_ESCAPES_P 8 | |
2228 | #define READ_OPTION_SQUARE_BRACKETS_P 10 | |
2229 | #define READ_OPTION_HUNGRY_EOL_ESCAPES_P 12 | |
bf9eb54a | 2230 | #define READ_OPTION_CURLY_INFIX_P 14 |
dc59631d | 2231 | #define READ_OPTION_R7RS_SYMBOLS_P 16 |
ea8c9761 | 2232 | |
bf9eb54a | 2233 | /* The total width in bits of the per-port overrides */ |
dc59631d | 2234 | #define READ_OPTIONS_NUM_BITS 18 |
ea8c9761 MW |
2235 | |
2236 | #define READ_OPTIONS_INHERIT_ALL ((1UL << READ_OPTIONS_NUM_BITS) - 1) | |
2237 | #define READ_OPTIONS_MAX_VALUE READ_OPTIONS_INHERIT_ALL | |
2238 | ||
2239 | #define READ_OPTION_MASK 3 | |
2240 | #define READ_OPTION_INHERIT 3 | |
2241 | ||
2242 | static void | |
2243 | set_port_read_option (SCM port, int option, int new_value) | |
2244 | { | |
a38024ba | 2245 | SCM scm_read_options; |
ea8c9761 MW |
2246 | unsigned int read_options; |
2247 | ||
2248 | new_value &= READ_OPTION_MASK; | |
79657fd3 MW |
2249 | |
2250 | scm_dynwind_begin (0); | |
2251 | scm_dynwind_lock_port (port); | |
2252 | ||
a38024ba | 2253 | scm_read_options = scm_i_port_property (port, sym_port_read_options); |
ea8c9761 MW |
2254 | if (scm_is_unsigned_integer (scm_read_options, 0, READ_OPTIONS_MAX_VALUE)) |
2255 | read_options = scm_to_uint (scm_read_options); | |
2256 | else | |
2257 | read_options = READ_OPTIONS_INHERIT_ALL; | |
2258 | read_options &= ~(READ_OPTION_MASK << option); | |
2259 | read_options |= new_value << option; | |
2260 | scm_read_options = scm_from_uint (read_options); | |
a38024ba | 2261 | scm_i_set_port_property_x (port, sym_port_read_options, scm_read_options); |
79657fd3 MW |
2262 | |
2263 | scm_dynwind_end (); | |
ea8c9761 MW |
2264 | } |
2265 | ||
9331ffd8 MW |
2266 | /* Set OPTS and PORT's case-insensitivity according to VALUE. */ |
2267 | static void | |
2268 | set_port_case_insensitive_p (SCM port, scm_t_read_opts *opts, int value) | |
2269 | { | |
2270 | value = !!value; | |
2271 | opts->case_insensitive_p = value; | |
2272 | set_port_read_option (port, READ_OPTION_CASE_INSENSITIVE_P, value); | |
2273 | } | |
2274 | ||
bf9eb54a MW |
2275 | /* Set OPTS and PORT's square_brackets_p option according to VALUE. */ |
2276 | static void | |
2277 | set_port_square_brackets_p (SCM port, scm_t_read_opts *opts, int value) | |
2278 | { | |
2279 | value = !!value; | |
2280 | opts->square_brackets_p = value; | |
2281 | set_port_read_option (port, READ_OPTION_SQUARE_BRACKETS_P, value); | |
2282 | } | |
2283 | ||
2284 | /* Set OPTS and PORT's curly_infix_p option according to VALUE. */ | |
2285 | static void | |
2286 | set_port_curly_infix_p (SCM port, scm_t_read_opts *opts, int value) | |
2287 | { | |
2288 | value = !!value; | |
2289 | opts->curly_infix_p = value; | |
2290 | set_port_read_option (port, READ_OPTION_CURLY_INFIX_P, value); | |
2291 | } | |
2292 | ||
ea8c9761 MW |
2293 | /* Initialize OPTS based on PORT's read options and the global read |
2294 | options. */ | |
2295 | static void | |
2296 | init_read_options (SCM port, scm_t_read_opts *opts) | |
2297 | { | |
a38024ba | 2298 | SCM val, scm_read_options; |
ea8c9761 MW |
2299 | unsigned int read_options, x; |
2300 | ||
a38024ba | 2301 | scm_read_options = scm_i_port_property (port, sym_port_read_options); |
ea8c9761 MW |
2302 | |
2303 | if (scm_is_unsigned_integer (scm_read_options, 0, READ_OPTIONS_MAX_VALUE)) | |
2304 | read_options = scm_to_uint (scm_read_options); | |
2305 | else | |
2306 | read_options = READ_OPTIONS_INHERIT_ALL; | |
2307 | ||
2308 | x = READ_OPTION_MASK & (read_options >> READ_OPTION_KEYWORD_STYLE); | |
2309 | if (x == READ_OPTION_INHERIT) | |
2310 | { | |
2311 | val = SCM_PACK (SCM_KEYWORD_STYLE); | |
2312 | if (scm_is_eq (val, scm_keyword_prefix)) | |
2313 | x = KEYWORD_STYLE_PREFIX; | |
2314 | else if (scm_is_eq (val, scm_keyword_postfix)) | |
2315 | x = KEYWORD_STYLE_POSTFIX; | |
2316 | else | |
2317 | x = KEYWORD_STYLE_HASH_PREFIX; | |
2318 | } | |
2319 | opts->keyword_style = x; | |
2320 | ||
2321 | #define RESOLVE_BOOLEAN_OPTION(NAME, name) \ | |
2322 | do \ | |
2323 | { \ | |
2324 | x = READ_OPTION_MASK & (read_options >> READ_OPTION_ ## NAME); \ | |
2325 | if (x == READ_OPTION_INHERIT) \ | |
2326 | x = !!SCM_ ## NAME; \ | |
2327 | opts->name = x; \ | |
2328 | } \ | |
2329 | while (0) | |
2330 | ||
2331 | RESOLVE_BOOLEAN_OPTION (COPY_SOURCE_P, copy_source_p); | |
2332 | RESOLVE_BOOLEAN_OPTION (RECORD_POSITIONS_P, record_positions_p); | |
2333 | RESOLVE_BOOLEAN_OPTION (CASE_INSENSITIVE_P, case_insensitive_p); | |
2334 | RESOLVE_BOOLEAN_OPTION (R6RS_ESCAPES_P, r6rs_escapes_p); | |
2335 | RESOLVE_BOOLEAN_OPTION (SQUARE_BRACKETS_P, square_brackets_p); | |
2336 | RESOLVE_BOOLEAN_OPTION (HUNGRY_EOL_ESCAPES_P, hungry_eol_escapes_p); | |
bf9eb54a | 2337 | RESOLVE_BOOLEAN_OPTION (CURLY_INFIX_P, curly_infix_p); |
dc59631d | 2338 | RESOLVE_BOOLEAN_OPTION (R7RS_SYMBOLS_P, r7rs_symbols_p); |
ea8c9761 MW |
2339 | |
2340 | #undef RESOLVE_BOOLEAN_OPTION | |
bf9eb54a MW |
2341 | |
2342 | opts->neoteric_p = 0; | |
ea8c9761 MW |
2343 | } |
2344 | ||
0f2d19dd JB |
2345 | void |
2346 | scm_init_read () | |
0f2d19dd | 2347 | { |
d458073b AR |
2348 | SCM read_hash_procs; |
2349 | ||
c81c2ad3 | 2350 | read_hash_procs = scm_make_fluid_with_default (SCM_EOL); |
d458073b AR |
2351 | |
2352 | scm_i_read_hash_procedures = | |
2353 | SCM_VARIABLE_LOC (scm_c_define ("%read-hash-procedures", read_hash_procs)); | |
fed9c9a2 | 2354 | |
62560650 | 2355 | scm_init_opts (scm_read_options, scm_read_opts); |
a0599745 | 2356 | #include "libguile/read.x" |
0f2d19dd | 2357 | } |
89e00824 ML |
2358 | |
2359 | /* | |
2360 | Local Variables: | |
2361 | c-file-style: "gnu" | |
2362 | End: | |
2363 | */ |