Commit | Line | Data |
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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 LC |
28 | #include <ctype.h> |
29 | #include <string.h> | |
889975e5 MG |
30 | #include <unistd.h> |
31 | #include <unicase.h> | |
684d664e | 32 | #include <unictype.h> |
96965a6e | 33 | #include <c-strcase.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" | |
49bb5bd3 | 47 | #include "libguile/fports.h" |
a0599745 MD |
48 | #include "libguile/root.h" |
49 | #include "libguile/strings.h" | |
ba1b2226 | 50 | #include "libguile/strports.h" |
a0599745 | 51 | #include "libguile/vectors.h" |
a0599745 | 52 | #include "libguile/validate.h" |
a4022e69 | 53 | #include "libguile/srfi-4.h" |
7337d56d | 54 | #include "libguile/srfi-13.h" |
ba1b2226 | 55 | |
a0599745 | 56 | #include "libguile/read.h" |
22fc179a HWN |
57 | #include "libguile/private-options.h" |
58 | ||
0f2d19dd JB |
59 | |
60 | \f | |
61 | ||
5bf6a6f0 | 62 | SCM_GLOBAL_SYMBOL (scm_sym_dot, "."); |
c7733771 | 63 | SCM_SYMBOL (scm_keyword_prefix, "prefix"); |
ef4cbc08 | 64 | SCM_SYMBOL (scm_keyword_postfix, "postfix"); |
7c4aad9c | 65 | SCM_SYMBOL (sym_nil, "nil"); |
c7733771 | 66 | |
bf9eb54a MW |
67 | /* SRFI-105 curly infix expression support */ |
68 | SCM_SYMBOL (sym_nfx, "$nfx$"); | |
69 | SCM_SYMBOL (sym_bracket_list, "$bracket-list$"); | |
70 | SCM_SYMBOL (sym_bracket_apply, "$bracket-apply$"); | |
71 | ||
72 | scm_t_option scm_read_opts[] = | |
73 | { | |
74 | { SCM_OPTION_BOOLEAN, "copy", 0, | |
75 | "Copy source code expressions." }, | |
76 | { SCM_OPTION_BOOLEAN, "positions", 1, | |
77 | "Record positions of source code expressions." }, | |
78 | { SCM_OPTION_BOOLEAN, "case-insensitive", 0, | |
79 | "Convert symbols to lower case."}, | |
80 | { SCM_OPTION_SCM, "keywords", (scm_t_bits) SCM_BOOL_F_BITS, | |
81 | "Style of keyword recognition: #f, 'prefix or 'postfix."}, | |
82 | { SCM_OPTION_BOOLEAN, "r6rs-hex-escapes", 0, | |
83 | "Use R6RS variable-length character and string hex escapes."}, | |
84 | { SCM_OPTION_BOOLEAN, "square-brackets", 1, | |
85 | "Treat `[' and `]' as parentheses, for R6RS compatibility."}, | |
86 | { SCM_OPTION_BOOLEAN, "hungry-eol-escapes", 0, | |
87 | "In strings, consume leading whitespace after an escaped end-of-line."}, | |
88 | { SCM_OPTION_BOOLEAN, "curly-infix", 0, | |
89 | "Support SRFI-105 curly infix expressions."}, | |
90 | { 0, }, | |
91 | }; | |
b1b5433d MW |
92 | |
93 | /* Internal read options structure. This is initialized by 'scm_read' | |
ea8c9761 MW |
94 | from the global and per-port read options, and a pointer is passed |
95 | down to all helper functions. */ | |
96 | ||
97 | enum t_keyword_style | |
98 | { | |
99 | KEYWORD_STYLE_HASH_PREFIX, | |
100 | KEYWORD_STYLE_PREFIX, | |
101 | KEYWORD_STYLE_POSTFIX | |
102 | }; | |
b1b5433d | 103 | |
ea8c9761 MW |
104 | struct t_read_opts |
105 | { | |
b1b5433d MW |
106 | enum t_keyword_style keyword_style; |
107 | unsigned int copy_source_p : 1; | |
108 | unsigned int record_positions_p : 1; | |
109 | unsigned int case_insensitive_p : 1; | |
110 | unsigned int r6rs_escapes_p : 1; | |
111 | unsigned int square_brackets_p : 1; | |
112 | unsigned int hungry_eol_escapes_p : 1; | |
bf9eb54a MW |
113 | unsigned int curly_infix_p : 1; |
114 | unsigned int neoteric_p : 1; | |
b1b5433d MW |
115 | }; |
116 | ||
117 | typedef struct t_read_opts scm_t_read_opts; | |
118 | ||
a16f6fe7 | 119 | |
39e8f371 HWN |
120 | /* |
121 | Give meaningful error messages for errors | |
122 | ||
123 | We use the format | |
124 | ||
ba1b2226 | 125 | FILE:LINE:COL: MESSAGE |
39e8f371 HWN |
126 | This happened in .... |
127 | ||
128 | This is not standard GNU format, but the test-suite likes the real | |
129 | message to be in front. | |
130 | ||
39e8f371 HWN |
131 | */ |
132 | ||
133 | ||
a4022e69 MV |
134 | void |
135 | scm_i_input_error (char const *function, | |
136 | SCM port, const char *message, SCM arg) | |
ba1b2226 | 137 | { |
29a837fd MV |
138 | SCM fn = (scm_is_string (SCM_FILENAME(port)) |
139 | ? SCM_FILENAME(port) | |
140 | : scm_from_locale_string ("#<unknown port>")); | |
ba1b2226 | 141 | |
29a837fd | 142 | SCM string_port = scm_open_output_string (); |
ba1b2226 HWN |
143 | SCM string = SCM_EOL; |
144 | scm_simple_format (string_port, | |
272632a6 | 145 | scm_from_locale_string ("~A:~S:~S: ~A"), |
29a837fd | 146 | scm_list_4 (fn, |
b3aa4626 | 147 | scm_from_long (SCM_LINUM (port) + 1), |
b9bd8526 | 148 | scm_from_int (SCM_COL (port) + 1), |
272632a6 | 149 | scm_from_locale_string (message))); |
ba1b2226 HWN |
150 | |
151 | string = scm_get_output_string (string_port); | |
152 | scm_close_output_port (string_port); | |
4a655e50 | 153 | scm_error_scm (scm_from_latin1_symbol ("read-error"), |
a4022e69 | 154 | function? scm_from_locale_string (function) : SCM_BOOL_F, |
ba1b2226 | 155 | string, |
dd72382c | 156 | arg, |
ba1b2226 HWN |
157 | SCM_BOOL_F); |
158 | } | |
39e8f371 HWN |
159 | |
160 | ||
a1ec6916 | 161 | SCM_DEFINE (scm_read_options, "read-options-interface", 0, 1, 0, |
1bbd0b84 | 162 | (SCM setting), |
dc7fa443 MG |
163 | "Option interface for the read options. Instead of using\n" |
164 | "this procedure directly, use the procedures @code{read-enable},\n" | |
3939e9df | 165 | "@code{read-disable}, @code{read-set!} and @code{read-options}.") |
1bbd0b84 | 166 | #define FUNC_NAME s_scm_read_options |
a16f6fe7 | 167 | { |
b7ff98dd MD |
168 | SCM ans = scm_options (setting, |
169 | scm_read_opts, | |
1bbd0b84 | 170 | FUNC_NAME); |
b7ff98dd MD |
171 | if (SCM_COPY_SOURCE_P) |
172 | SCM_RECORD_POSITIONS_P = 1; | |
a16f6fe7 MD |
173 | return ans; |
174 | } | |
1bbd0b84 | 175 | #undef FUNC_NAME |
a16f6fe7 | 176 | |
d458073b AR |
177 | /* A fluid referring to an association list mapping extra hash |
178 | characters to procedures. */ | |
179 | static SCM *scm_i_read_hash_procedures; | |
deca31e1 | 180 | |
cfd15439 | 181 | static SCM |
d458073b AR |
182 | scm_i_read_hash_procedures_ref (void) |
183 | { | |
184 | return scm_fluid_ref (*scm_i_read_hash_procedures); | |
185 | } | |
186 | ||
cfd15439 | 187 | static void |
d458073b AR |
188 | scm_i_read_hash_procedures_set_x (SCM value) |
189 | { | |
190 | scm_fluid_set_x (*scm_i_read_hash_procedures, value); | |
191 | } | |
0f2d19dd | 192 | |
7337d56d LC |
193 | \f |
194 | /* Token readers. */ | |
0f2d19dd | 195 | |
0f2d19dd | 196 | |
7337d56d LC |
197 | /* Size of the C buffer used to read symbols and numbers. */ |
198 | #define READER_BUFFER_SIZE 128 | |
0f2d19dd | 199 | |
ff4d3672 LC |
200 | /* Number of 32-bit codepoints in the buffer used to read strings. */ |
201 | #define READER_STRING_BUFFER_SIZE 128 | |
0f2d19dd | 202 | |
7337d56d LC |
203 | /* The maximum size of Scheme character names. */ |
204 | #define READER_CHAR_NAME_MAX_SIZE 50 | |
1cc91f1b | 205 | |
02327c0c MW |
206 | /* The maximum size of reader directive names. */ |
207 | #define READER_DIRECTIVE_NAME_MAX_SIZE 50 | |
208 | ||
94115ae3 | 209 | |
7337d56d LC |
210 | /* `isblank' is only in C99. */ |
211 | #define CHAR_IS_BLANK_(_chr) \ | |
212 | (((_chr) == ' ') || ((_chr) == '\t') || ((_chr) == '\n') \ | |
d41668fa | 213 | || ((_chr) == '\f') || ((_chr) == '\r')) |
7337d56d LC |
214 | |
215 | #ifdef MSDOS | |
216 | # define CHAR_IS_BLANK(_chr) \ | |
217 | ((CHAR_IS_BLANK_ (chr)) || ((_chr) == 26)) | |
218 | #else | |
219 | # define CHAR_IS_BLANK CHAR_IS_BLANK_ | |
220 | #endif | |
221 | ||
222 | ||
223 | /* R5RS one-character delimiters (see section 7.1.1, ``Lexical | |
224 | structure''). */ | |
225 | #define CHAR_IS_R5RS_DELIMITER(c) \ | |
226 | (CHAR_IS_BLANK (c) \ | |
603234c6 | 227 | || (c) == ')' || (c) == '(' || (c) == ';' || (c) == '"') |
7337d56d | 228 | |
603234c6 MW |
229 | #define CHAR_IS_DELIMITER(c) \ |
230 | (CHAR_IS_R5RS_DELIMITER (c) \ | |
bf9eb54a MW |
231 | || (((c) == ']' || (c) == '[') && (opts->square_brackets_p \ |
232 | || opts->curly_infix_p)) \ | |
233 | || (((c) == '}' || (c) == '{') && opts->curly_infix_p)) | |
7337d56d LC |
234 | |
235 | /* Exponent markers, as defined in section 7.1.1 of R5RS, ``Lexical | |
236 | Structure''. */ | |
237 | #define CHAR_IS_EXPONENT_MARKER(_chr) \ | |
238 | (((_chr) == 'e') || ((_chr) == 's') || ((_chr) == 'f') \ | |
239 | || ((_chr) == 'd') || ((_chr) == 'l')) | |
240 | ||
454866e0 | 241 | /* Read an SCSH block comment. */ |
cfd15439 | 242 | static SCM scm_read_scsh_block_comment (scm_t_wchar, SCM); |
620c8965 | 243 | static SCM scm_read_r6rs_block_comment (scm_t_wchar, SCM); |
b1b5433d MW |
244 | static SCM scm_read_commented_expression (scm_t_wchar, SCM, scm_t_read_opts *); |
245 | static SCM scm_read_shebang (scm_t_wchar, SCM, scm_t_read_opts *); | |
620c8965 | 246 | static SCM scm_get_hash_procedure (int); |
454866e0 | 247 | |
69f90b0b MG |
248 | /* Read from PORT until a delimiter (e.g., a whitespace) is read. Put the |
249 | result in the pre-allocated buffer BUF. Return zero if the whole token has | |
250 | fewer than BUF_SIZE bytes, non-zero otherwise. READ will be set the number of | |
251 | bytes actually read. */ | |
cfd15439 | 252 | static int |
b1b5433d MW |
253 | read_token (SCM port, scm_t_read_opts *opts, |
254 | char *buf, size_t buf_size, size_t *read) | |
b662b7e9 | 255 | { |
69f90b0b | 256 | *read = 0; |
0520c320 | 257 | |
69f90b0b MG |
258 | while (*read < buf_size) |
259 | { | |
260 | int chr; | |
7337d56d | 261 | |
69f90b0b | 262 | chr = scm_get_byte_or_eof (port); |
889975e5 | 263 | |
69f90b0b MG |
264 | if (chr == EOF) |
265 | return 0; | |
266 | else if (CHAR_IS_DELIMITER (chr)) | |
267 | { | |
268 | scm_unget_byte (chr, port); | |
269 | return 0; | |
270 | } | |
271 | else | |
272 | { | |
273 | *buf = (char) chr; | |
274 | buf++, (*read)++; | |
275 | } | |
276 | } | |
889975e5 | 277 | |
69f90b0b MG |
278 | return 1; |
279 | } | |
889975e5 | 280 | |
b662b7e9 LC |
281 | /* Like `read_token', but return either BUFFER, or a GC-allocated buffer |
282 | if the token doesn't fit in BUFFER_SIZE bytes. */ | |
283 | static char * | |
b1b5433d MW |
284 | read_complete_token (SCM port, scm_t_read_opts *opts, |
285 | char *buffer, size_t buffer_size, size_t *read) | |
69f90b0b MG |
286 | { |
287 | int overflow = 0; | |
b662b7e9 LC |
288 | size_t bytes_read, overflow_size = 0; |
289 | char *overflow_buffer = NULL; | |
1cc91f1b | 290 | |
69f90b0b MG |
291 | do |
292 | { | |
b1b5433d | 293 | overflow = read_token (port, opts, buffer, buffer_size, &bytes_read); |
69f90b0b MG |
294 | if (bytes_read == 0) |
295 | break; | |
296 | if (overflow || overflow_size != 0) | |
297 | { | |
298 | if (overflow_size == 0) | |
299 | { | |
b662b7e9 LC |
300 | overflow_buffer = scm_gc_malloc_pointerless (bytes_read, "read"); |
301 | memcpy (overflow_buffer, buffer, bytes_read); | |
69f90b0b MG |
302 | overflow_size = bytes_read; |
303 | } | |
304 | else | |
305 | { | |
7be3c2fc | 306 | char *new_buf = |
b662b7e9 LC |
307 | scm_gc_malloc_pointerless (overflow_size + bytes_read, "read"); |
308 | ||
309 | memcpy (new_buf, overflow_buffer, overflow_size); | |
310 | memcpy (new_buf + overflow_size, buffer, bytes_read); | |
311 | ||
312 | overflow_buffer = new_buf; | |
69f90b0b MG |
313 | overflow_size += bytes_read; |
314 | } | |
315 | } | |
889975e5 | 316 | } |
69f90b0b | 317 | while (overflow); |
889975e5 | 318 | |
69f90b0b MG |
319 | if (overflow_size) |
320 | *read = overflow_size; | |
b521d265 | 321 | else |
69f90b0b MG |
322 | *read = bytes_read; |
323 | ||
b662b7e9 | 324 | return (overflow_size > 0 ? overflow_buffer : buffer); |
889975e5 | 325 | } |
7337d56d LC |
326 | |
327 | /* Skip whitespace from PORT and return the first non-whitespace character | |
328 | read. Raise an error on end-of-file. */ | |
329 | static int | |
b1b5433d | 330 | flush_ws (SCM port, scm_t_read_opts *opts, const char *eoferr) |
0f2d19dd | 331 | { |
cfd15439 | 332 | scm_t_wchar c; |
0f2d19dd | 333 | while (1) |
b7f3516f | 334 | switch (c = scm_getc (port)) |
0f2d19dd JB |
335 | { |
336 | case EOF: | |
337 | goteof: | |
338 | if (eoferr) | |
d156d3b7 | 339 | { |
a4022e69 MV |
340 | scm_i_input_error (eoferr, |
341 | port, | |
342 | "end of file", | |
343 | SCM_EOL); | |
d156d3b7 | 344 | } |
0f2d19dd | 345 | return c; |
7337d56d | 346 | |
0f2d19dd JB |
347 | case ';': |
348 | lp: | |
b7f3516f | 349 | switch (c = scm_getc (port)) |
0f2d19dd JB |
350 | { |
351 | case EOF: | |
352 | goto goteof; | |
353 | default: | |
354 | goto lp; | |
355 | case SCM_LINE_INCREMENTORS: | |
356 | break; | |
357 | } | |
358 | break; | |
7337d56d | 359 | |
454866e0 LC |
360 | case '#': |
361 | switch (c = scm_getc (port)) | |
362 | { | |
363 | case EOF: | |
364 | eoferr = "read_sharp"; | |
365 | goto goteof; | |
366 | case '!': | |
b1b5433d | 367 | scm_read_shebang (c, port, opts); |
454866e0 | 368 | break; |
34f3d47d | 369 | case ';': |
b1b5433d | 370 | scm_read_commented_expression (c, port, opts); |
34f3d47d | 371 | break; |
620c8965 LC |
372 | case '|': |
373 | if (scm_is_false (scm_get_hash_procedure (c))) | |
374 | { | |
375 | scm_read_r6rs_block_comment (c, port); | |
376 | break; | |
377 | } | |
378 | /* fall through */ | |
454866e0 LC |
379 | default: |
380 | scm_ungetc (c, port); | |
381 | return '#'; | |
382 | } | |
383 | break; | |
384 | ||
0f2d19dd | 385 | case SCM_LINE_INCREMENTORS: |
0f2d19dd | 386 | case SCM_SINGLE_SPACES: |
0f2d19dd | 387 | case '\t': |
0f2d19dd | 388 | break; |
7337d56d | 389 | |
0f2d19dd JB |
390 | default: |
391 | return c; | |
392 | } | |
7337d56d LC |
393 | |
394 | return 0; | |
0f2d19dd JB |
395 | } |
396 | ||
397 | ||
7337d56d LC |
398 | \f |
399 | /* Token readers. */ | |
1cc91f1b | 400 | |
b1b5433d MW |
401 | static SCM scm_read_expression (SCM port, scm_t_read_opts *opts); |
402 | static SCM scm_read_sharp (int chr, SCM port, scm_t_read_opts *opts, | |
403 | long line, int column); | |
0f2d19dd JB |
404 | |
405 | ||
d6cb0203 | 406 | static SCM |
b1b5433d MW |
407 | maybe_annotate_source (SCM x, SCM port, scm_t_read_opts *opts, |
408 | long line, int column) | |
d6cb0203 | 409 | { |
b1b5433d | 410 | if (opts->record_positions_p) |
d6cb0203 MW |
411 | scm_i_set_source_properties_x (x, line, column, SCM_FILENAME (port)); |
412 | return x; | |
413 | } | |
414 | ||
09a4f039 | 415 | static SCM |
b1b5433d | 416 | scm_read_sexp (scm_t_wchar chr, SCM port, scm_t_read_opts *opts) |
7337d56d | 417 | #define FUNC_NAME "scm_i_lreadparen" |
09a4f039 | 418 | { |
26c8cc14 AW |
419 | int c; |
420 | SCM tmp, tl, ans = SCM_EOL; | |
bf9eb54a MW |
421 | const int curly_list_p = (chr == '{') && opts->curly_infix_p; |
422 | const int terminating_char = ((chr == '{') ? '}' | |
423 | : ((chr == '[') ? ']' | |
424 | : ')')); | |
7337d56d LC |
425 | |
426 | /* Need to capture line and column numbers here. */ | |
427 | long line = SCM_LINUM (port); | |
428 | int column = SCM_COL (port) - 1; | |
f9c68a47 | 429 | |
b1b5433d | 430 | c = flush_ws (port, opts, FUNC_NAME); |
7337d56d LC |
431 | if (terminating_char == c) |
432 | return SCM_EOL; | |
f9c68a47 | 433 | |
7337d56d | 434 | scm_ungetc (c, port); |
b1b5433d | 435 | tmp = scm_read_expression (port, opts); |
1f7945a7 AW |
436 | |
437 | /* Note that it is possible for scm_read_expression to return | |
438 | scm_sym_dot, but not as part of a dotted pair: as in #{.}#. So | |
439 | check that it's a real dot by checking `c'. */ | |
440 | if (c == '.' && scm_is_eq (scm_sym_dot, tmp)) | |
7337d56d | 441 | { |
b1b5433d MW |
442 | ans = scm_read_expression (port, opts); |
443 | if (terminating_char != (c = flush_ws (port, opts, FUNC_NAME))) | |
7337d56d LC |
444 | scm_i_input_error (FUNC_NAME, port, "missing close paren", |
445 | SCM_EOL); | |
446 | return ans; | |
447 | } | |
1cc91f1b | 448 | |
7337d56d LC |
449 | /* Build the head of the list structure. */ |
450 | ans = tl = scm_cons (tmp, SCM_EOL); | |
451 | ||
b1b5433d | 452 | while (terminating_char != (c = flush_ws (port, opts, FUNC_NAME))) |
0f2d19dd | 453 | { |
7337d56d | 454 | SCM new_tail; |
0f2d19dd | 455 | |
bf9eb54a MW |
456 | if (c == ')' || (c == ']' && opts->square_brackets_p) |
457 | || ((c == '}' || c == ']') && opts->curly_infix_p)) | |
5b69315e AW |
458 | scm_i_input_error (FUNC_NAME, port, |
459 | "in pair: mismatched close paren: ~A", | |
460 | scm_list_1 (SCM_MAKE_CHAR (c))); | |
461 | ||
7337d56d | 462 | scm_ungetc (c, port); |
b1b5433d | 463 | tmp = scm_read_expression (port, opts); |
5b69315e | 464 | |
1f7945a7 AW |
465 | /* See above note about scm_sym_dot. */ |
466 | if (c == '.' && scm_is_eq (scm_sym_dot, tmp)) | |
0f2d19dd | 467 | { |
b1b5433d | 468 | SCM_SETCDR (tl, scm_read_expression (port, opts)); |
7337d56d | 469 | |
b1b5433d | 470 | c = flush_ws (port, opts, FUNC_NAME); |
7337d56d LC |
471 | if (terminating_char != c) |
472 | scm_i_input_error (FUNC_NAME, port, | |
473 | "in pair: missing close paren", SCM_EOL); | |
bf9eb54a | 474 | break; |
0f2d19dd | 475 | } |
b858464a | 476 | |
7337d56d LC |
477 | new_tail = scm_cons (tmp, SCM_EOL); |
478 | SCM_SETCDR (tl, new_tail); | |
479 | tl = new_tail; | |
7337d56d | 480 | } |
0f2d19dd | 481 | |
bf9eb54a MW |
482 | if (curly_list_p) |
483 | { | |
484 | /* In addition to finding the length, 'scm_ilength' checks for | |
485 | improper or circular lists, in which case it returns -1. */ | |
486 | int len = scm_ilength (ans); | |
487 | ||
488 | /* The (len == 0) case is handled above */ | |
489 | if (len == 1) | |
490 | /* Return directly to avoid re-annotating the element's source | |
491 | location with the position of the outer brace. Also, it | |
492 | might not be possible to annotate the element. */ | |
493 | return scm_car (ans); /* {e} => e */ | |
494 | else if (len == 2) | |
495 | ; /* Leave the list unchanged: {e1 e2} => (e1 e2) */ | |
496 | else if (len >= 3 && (len & 1)) | |
497 | { | |
498 | /* It's a proper list whose length is odd and at least 3. If | |
499 | the elements at odd indices (the infix operator positions) | |
500 | are all 'equal?', then it's a simple curly-infix list. | |
501 | Otherwise it's a mixed curly-infix list. */ | |
502 | SCM op = scm_cadr (ans); | |
503 | ||
504 | /* Check to see if the elements at odd indices are 'equal?' */ | |
505 | for (tl = scm_cdddr (ans); ; tl = scm_cddr (tl)) | |
506 | { | |
507 | if (scm_is_null (tl)) | |
508 | { | |
509 | /* Convert simple curly-infix list to prefix: | |
510 | {a <op> b <op> ...} => (<op> a b ...) */ | |
511 | tl = ans; | |
512 | while (scm_is_pair (scm_cdr (tl))) | |
513 | { | |
514 | tmp = scm_cddr (tl); | |
515 | SCM_SETCDR (tl, tmp); | |
516 | tl = tmp; | |
517 | } | |
518 | ans = scm_cons (op, ans); | |
519 | break; | |
520 | } | |
521 | else if (scm_is_false (scm_equal_p (op, scm_car (tl)))) | |
522 | { | |
523 | /* Mixed curly-infix list: {e ...} => ($nfx$ e ...) */ | |
524 | ans = scm_cons (sym_nfx, ans); | |
525 | break; | |
526 | } | |
527 | } | |
528 | } | |
529 | else | |
530 | /* Mixed curly-infix (possibly improper) list: | |
531 | {e . tail} => ($nfx$ e . tail) */ | |
532 | ans = scm_cons (sym_nfx, ans); | |
533 | } | |
534 | ||
b1b5433d | 535 | return maybe_annotate_source (ans, port, opts, line, column); |
7337d56d LC |
536 | } |
537 | #undef FUNC_NAME | |
a4022e69 | 538 | |
c5661d28 MG |
539 | |
540 | /* Read a hexadecimal number NDIGITS in length. Put its value into the variable | |
dea901d6 MG |
541 | C. If TERMINATOR is non-null, terminate early if the TERMINATOR character is |
542 | found. */ | |
543 | #define SCM_READ_HEX_ESCAPE(ndigits, terminator) \ | |
544 | do \ | |
545 | { \ | |
546 | scm_t_wchar a; \ | |
547 | size_t i = 0; \ | |
548 | c = 0; \ | |
549 | while (i < ndigits) \ | |
550 | { \ | |
551 | a = scm_getc (port); \ | |
552 | if (a == EOF) \ | |
553 | goto str_eof; \ | |
554 | if (terminator \ | |
555 | && (a == (scm_t_wchar) terminator) \ | |
556 | && (i > 0)) \ | |
557 | break; \ | |
558 | if ('0' <= a && a <= '9') \ | |
559 | a -= '0'; \ | |
560 | else if ('A' <= a && a <= 'F') \ | |
561 | a = a - 'A' + 10; \ | |
562 | else if ('a' <= a && a <= 'f') \ | |
563 | a = a - 'a' + 10; \ | |
564 | else \ | |
565 | { \ | |
566 | c = a; \ | |
567 | goto bad_escaped; \ | |
568 | } \ | |
569 | c = c * 16 + a; \ | |
570 | i ++; \ | |
571 | } \ | |
c5661d28 MG |
572 | } while (0) |
573 | ||
684d664e AW |
574 | static void |
575 | skip_intraline_whitespace (SCM port) | |
576 | { | |
577 | scm_t_wchar c; | |
578 | ||
579 | do | |
580 | { | |
581 | c = scm_getc (port); | |
582 | if (c == EOF) | |
583 | return; | |
584 | } | |
585 | while (c == '\t' || uc_is_general_category (c, UC_SPACE_SEPARATOR)); | |
586 | ||
587 | scm_ungetc (c, port); | |
588 | } | |
589 | ||
7337d56d | 590 | static SCM |
b1b5433d | 591 | scm_read_string (int chr, SCM port, scm_t_read_opts *opts) |
7337d56d LC |
592 | #define FUNC_NAME "scm_lreadr" |
593 | { | |
594 | /* For strings smaller than C_STR, this function creates only one Scheme | |
595 | object (the string returned). */ | |
0f2d19dd | 596 | |
ff4d3672 LC |
597 | SCM str = SCM_EOL; |
598 | size_t c_str_len = 0; | |
599 | scm_t_wchar c, c_str[READER_STRING_BUFFER_SIZE]; | |
eb42ff25 | 600 | |
b131b233 MW |
601 | /* Need to capture line and column numbers here. */ |
602 | long line = SCM_LINUM (port); | |
603 | int column = SCM_COL (port) - 1; | |
604 | ||
7337d56d LC |
605 | while ('"' != (c = scm_getc (port))) |
606 | { | |
607 | if (c == EOF) | |
9c44cd45 MG |
608 | { |
609 | str_eof: | |
610 | scm_i_input_error (FUNC_NAME, port, | |
611 | "end of file in string constant", SCM_EOL); | |
612 | } | |
0f2d19dd | 613 | |
ff4d3672 LC |
614 | if (c_str_len + 1 >= READER_STRING_BUFFER_SIZE) |
615 | { | |
616 | str = scm_cons (scm_from_utf32_stringn (c_str, c_str_len), str); | |
617 | c_str_len = 0; | |
618 | } | |
0f2d19dd | 619 | |
7337d56d | 620 | if (c == '\\') |
9c44cd45 MG |
621 | { |
622 | switch (c = scm_getc (port)) | |
623 | { | |
624 | case EOF: | |
625 | goto str_eof; | |
626 | case '"': | |
6579c330 | 627 | case '|': |
9c44cd45 MG |
628 | case '\\': |
629 | break; | |
9c44cd45 | 630 | case '\n': |
b1b5433d | 631 | if (opts->hungry_eol_escapes_p) |
684d664e | 632 | skip_intraline_whitespace (port); |
9c44cd45 MG |
633 | continue; |
634 | case '0': | |
635 | c = '\0'; | |
636 | break; | |
637 | case 'f': | |
638 | c = '\f'; | |
639 | break; | |
640 | case 'n': | |
641 | c = '\n'; | |
642 | break; | |
643 | case 'r': | |
644 | c = '\r'; | |
645 | break; | |
646 | case 't': | |
647 | c = '\t'; | |
648 | break; | |
649 | case 'a': | |
650 | c = '\007'; | |
651 | break; | |
652 | case 'v': | |
653 | c = '\v'; | |
654 | break; | |
67a4a16d MG |
655 | case 'b': |
656 | c = '\010'; | |
657 | break; | |
9c44cd45 | 658 | case 'x': |
b1b5433d | 659 | if (opts->r6rs_escapes_p) |
dea901d6 MG |
660 | SCM_READ_HEX_ESCAPE (10, ';'); |
661 | else | |
662 | SCM_READ_HEX_ESCAPE (2, '\0'); | |
c5661d28 | 663 | break; |
9c44cd45 | 664 | case 'u': |
b1b5433d | 665 | if (!opts->r6rs_escapes_p) |
898a0b5a MG |
666 | { |
667 | SCM_READ_HEX_ESCAPE (4, '\0'); | |
668 | break; | |
669 | } | |
9c44cd45 | 670 | case 'U': |
b1b5433d | 671 | if (!opts->r6rs_escapes_p) |
898a0b5a MG |
672 | { |
673 | SCM_READ_HEX_ESCAPE (6, '\0'); | |
674 | break; | |
675 | } | |
9c44cd45 MG |
676 | default: |
677 | bad_escaped: | |
678 | scm_i_input_error (FUNC_NAME, port, | |
679 | "illegal character in escape sequence: ~S", | |
680 | scm_list_1 (SCM_MAKE_CHAR (c))); | |
681 | } | |
682 | } | |
ff4d3672 LC |
683 | |
684 | c_str[c_str_len++] = c; | |
7337d56d | 685 | } |
ff4d3672 LC |
686 | |
687 | if (scm_is_null (str)) | |
688 | /* Fast path: we got a string that fits in C_STR. */ | |
689 | str = scm_from_utf32_stringn (c_str, c_str_len); | |
690 | else | |
691 | { | |
692 | if (c_str_len > 0) | |
693 | str = scm_cons (scm_from_utf32_stringn (c_str, c_str_len), str); | |
694 | ||
695 | str = scm_string_concatenate_reverse (str, SCM_UNDEFINED, SCM_UNDEFINED); | |
696 | } | |
697 | ||
b1b5433d | 698 | return maybe_annotate_source (str, port, opts, line, column); |
0f2d19dd | 699 | } |
db4b4ca6 DH |
700 | #undef FUNC_NAME |
701 | ||
0f2d19dd | 702 | |
7337d56d | 703 | static SCM |
b1b5433d | 704 | scm_read_number (scm_t_wchar chr, SCM port, scm_t_read_opts *opts) |
0f2d19dd | 705 | { |
69f90b0b | 706 | SCM result, str = SCM_EOL; |
b662b7e9 | 707 | char local_buffer[READER_BUFFER_SIZE], *buffer; |
69f90b0b | 708 | size_t bytes_read; |
69f90b0b | 709 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
0f2d19dd | 710 | |
38f19074 MW |
711 | /* Need to capture line and column numbers here. */ |
712 | long line = SCM_LINUM (port); | |
713 | int column = SCM_COL (port) - 1; | |
714 | ||
7337d56d | 715 | scm_ungetc (chr, port); |
b1b5433d | 716 | buffer = read_complete_token (port, opts, local_buffer, sizeof local_buffer, |
b662b7e9 | 717 | &bytes_read); |
69f90b0b | 718 | |
b662b7e9 | 719 | str = scm_from_stringn (buffer, bytes_read, pt->encoding, pt->ilseq_handler); |
69f90b0b MG |
720 | |
721 | result = scm_string_to_number (str, SCM_UNDEFINED); | |
38f19074 | 722 | if (scm_is_false (result)) |
69f90b0b MG |
723 | { |
724 | /* Return a symbol instead of a number */ | |
b1b5433d | 725 | if (opts->case_insensitive_p) |
69f90b0b MG |
726 | str = scm_string_downcase_x (str); |
727 | result = scm_string_to_symbol (str); | |
728 | } | |
38f19074 | 729 | else if (SCM_NIMP (result)) |
b1b5433d | 730 | result = maybe_annotate_source (result, port, opts, line, column); |
0f2d19dd | 731 | |
69f90b0b | 732 | SCM_COL (port) += scm_i_string_length (str); |
7337d56d LC |
733 | return result; |
734 | } | |
0f2d19dd | 735 | |
7337d56d | 736 | static SCM |
b1b5433d | 737 | scm_read_mixed_case_symbol (scm_t_wchar chr, SCM port, scm_t_read_opts *opts) |
7337d56d | 738 | { |
889975e5 MG |
739 | SCM result; |
740 | int ends_with_colon = 0; | |
69f90b0b | 741 | size_t bytes_read; |
b1b5433d | 742 | int postfix = (opts->keyword_style == KEYWORD_STYLE_POSTFIX); |
b662b7e9 | 743 | char local_buffer[READER_BUFFER_SIZE], *buffer; |
69f90b0b MG |
744 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
745 | SCM str; | |
7337d56d LC |
746 | |
747 | scm_ungetc (chr, port); | |
b1b5433d | 748 | buffer = read_complete_token (port, opts, local_buffer, sizeof local_buffer, |
b662b7e9 | 749 | &bytes_read); |
69f90b0b | 750 | if (bytes_read > 0) |
b662b7e9 | 751 | ends_with_colon = buffer[bytes_read - 1] == ':'; |
ef4cbc08 | 752 | |
69f90b0b MG |
753 | if (postfix && ends_with_colon && (bytes_read > 1)) |
754 | { | |
b662b7e9 LC |
755 | str = scm_from_stringn (buffer, bytes_read - 1, |
756 | pt->encoding, pt->ilseq_handler); | |
69f90b0b | 757 | |
b1b5433d | 758 | if (opts->case_insensitive_p) |
69f90b0b MG |
759 | str = scm_string_downcase_x (str); |
760 | result = scm_symbol_to_keyword (scm_string_to_symbol (str)); | |
761 | } | |
7337d56d | 762 | else |
69f90b0b | 763 | { |
b662b7e9 LC |
764 | str = scm_from_stringn (buffer, bytes_read, |
765 | pt->encoding, pt->ilseq_handler); | |
69f90b0b | 766 | |
b1b5433d | 767 | if (opts->case_insensitive_p) |
69f90b0b MG |
768 | str = scm_string_downcase_x (str); |
769 | result = scm_string_to_symbol (str); | |
770 | } | |
7337d56d | 771 | |
69f90b0b | 772 | SCM_COL (port) += scm_i_string_length (str); |
7337d56d LC |
773 | return result; |
774 | } | |
775 | ||
776 | static SCM | |
b1b5433d | 777 | scm_read_number_and_radix (scm_t_wchar chr, SCM port, scm_t_read_opts *opts) |
7337d56d LC |
778 | #define FUNC_NAME "scm_lreadr" |
779 | { | |
889975e5 | 780 | SCM result; |
7337d56d | 781 | size_t read; |
b662b7e9 | 782 | char local_buffer[READER_BUFFER_SIZE], *buffer; |
7337d56d | 783 | unsigned int radix; |
69f90b0b MG |
784 | SCM str; |
785 | scm_t_port *pt; | |
7337d56d LC |
786 | |
787 | switch (chr) | |
788 | { | |
789 | case 'B': | |
790 | case 'b': | |
791 | radix = 2; | |
792 | break; | |
793 | ||
794 | case 'o': | |
795 | case 'O': | |
796 | radix = 8; | |
797 | break; | |
798 | ||
799 | case 'd': | |
800 | case 'D': | |
801 | radix = 10; | |
802 | break; | |
803 | ||
804 | case 'x': | |
805 | case 'X': | |
806 | radix = 16; | |
807 | break; | |
808 | ||
809 | default: | |
810 | scm_ungetc (chr, port); | |
811 | scm_ungetc ('#', port); | |
812 | radix = 10; | |
813 | } | |
814 | ||
b1b5433d | 815 | buffer = read_complete_token (port, opts, local_buffer, sizeof local_buffer, |
b662b7e9 | 816 | &read); |
69f90b0b MG |
817 | |
818 | pt = SCM_PTAB_ENTRY (port); | |
b662b7e9 | 819 | str = scm_from_stringn (buffer, read, pt->encoding, pt->ilseq_handler); |
69f90b0b MG |
820 | |
821 | result = scm_string_to_number (str, scm_from_uint (radix)); | |
822 | ||
69f90b0b | 823 | SCM_COL (port) += scm_i_string_length (str); |
7337d56d LC |
824 | |
825 | if (scm_is_true (result)) | |
826 | return result; | |
827 | ||
828 | scm_i_input_error (FUNC_NAME, port, "unknown # object", SCM_EOL); | |
829 | ||
830 | return SCM_BOOL_F; | |
831 | } | |
832 | #undef FUNC_NAME | |
833 | ||
834 | static SCM | |
b1b5433d | 835 | scm_read_quote (int chr, SCM port, scm_t_read_opts *opts) |
7337d56d LC |
836 | { |
837 | SCM p; | |
492faee1 LC |
838 | long line = SCM_LINUM (port); |
839 | int column = SCM_COL (port) - 1; | |
7337d56d LC |
840 | |
841 | switch (chr) | |
842 | { | |
843 | case '`': | |
844 | p = scm_sym_quasiquote; | |
845 | break; | |
846 | ||
847 | case '\'': | |
848 | p = scm_sym_quote; | |
849 | break; | |
850 | ||
851 | case ',': | |
852 | { | |
889975e5 | 853 | scm_t_wchar c; |
7337d56d LC |
854 | |
855 | c = scm_getc (port); | |
856 | if ('@' == c) | |
857 | p = scm_sym_uq_splicing; | |
858 | else | |
0f2d19dd | 859 | { |
7337d56d LC |
860 | scm_ungetc (c, port); |
861 | p = scm_sym_unquote; | |
0f2d19dd | 862 | } |
7337d56d LC |
863 | break; |
864 | } | |
0f2d19dd | 865 | |
7337d56d LC |
866 | default: |
867 | fprintf (stderr, "%s: unhandled quote character (%i)\n", | |
7f74cf9a | 868 | "scm_read_quote", chr); |
7337d56d | 869 | abort (); |
0f2d19dd | 870 | } |
1cc91f1b | 871 | |
b1b5433d MW |
872 | p = scm_cons2 (p, scm_read_expression (port, opts), SCM_EOL); |
873 | return maybe_annotate_source (p, port, opts, line, column); | |
7337d56d LC |
874 | } |
875 | ||
34f3d47d AW |
876 | SCM_SYMBOL (sym_syntax, "syntax"); |
877 | SCM_SYMBOL (sym_quasisyntax, "quasisyntax"); | |
878 | SCM_SYMBOL (sym_unsyntax, "unsyntax"); | |
879 | SCM_SYMBOL (sym_unsyntax_splicing, "unsyntax-splicing"); | |
880 | ||
881 | static SCM | |
b1b5433d | 882 | scm_read_syntax (int chr, SCM port, scm_t_read_opts *opts) |
34f3d47d AW |
883 | { |
884 | SCM p; | |
885 | long line = SCM_LINUM (port); | |
886 | int column = SCM_COL (port) - 1; | |
887 | ||
888 | switch (chr) | |
889 | { | |
890 | case '`': | |
891 | p = sym_quasisyntax; | |
892 | break; | |
893 | ||
894 | case '\'': | |
895 | p = sym_syntax; | |
896 | break; | |
897 | ||
898 | case ',': | |
899 | { | |
900 | int c; | |
901 | ||
902 | c = scm_getc (port); | |
903 | if ('@' == c) | |
904 | p = sym_unsyntax_splicing; | |
905 | else | |
906 | { | |
907 | scm_ungetc (c, port); | |
908 | p = sym_unsyntax; | |
909 | } | |
910 | break; | |
911 | } | |
912 | ||
913 | default: | |
914 | fprintf (stderr, "%s: unhandled syntax character (%i)\n", | |
915 | "scm_read_syntax", chr); | |
916 | abort (); | |
917 | } | |
918 | ||
b1b5433d MW |
919 | p = scm_cons2 (p, scm_read_expression (port, opts), SCM_EOL); |
920 | return maybe_annotate_source (p, port, opts, line, column); | |
34f3d47d AW |
921 | } |
922 | ||
cfd15439 | 923 | static SCM |
b1b5433d | 924 | scm_read_nil (int chr, SCM port, scm_t_read_opts *opts) |
7c4aad9c | 925 | { |
b1b5433d | 926 | SCM id = scm_read_mixed_case_symbol (chr, port, opts); |
7c4aad9c AW |
927 | |
928 | if (!scm_is_eq (id, sym_nil)) | |
929 | scm_i_input_error ("scm_read_nil", port, | |
930 | "unexpected input while reading #nil: ~a", | |
931 | scm_list_1 (id)); | |
932 | ||
933 | return SCM_ELISP_NIL; | |
934 | } | |
935 | ||
cfd15439 | 936 | static SCM |
7337d56d | 937 | scm_read_semicolon_comment (int chr, SCM port) |
0f2d19dd | 938 | { |
0f2d19dd JB |
939 | int c; |
940 | ||
889975e5 MG |
941 | /* We use the get_byte here because there is no need to get the |
942 | locale correct with comment input. This presumes that newline | |
943 | always represents itself no matter what the encoding is. */ | |
944 | for (c = scm_get_byte_or_eof (port); | |
7337d56d | 945 | (c != EOF) && (c != '\n'); |
8a8da78d | 946 | c = scm_get_byte_or_eof (port)); |
7337d56d LC |
947 | |
948 | return SCM_UNSPECIFIED; | |
949 | } | |
950 | ||
7a329029 MW |
951 | /* If the EXPECTED_CHARS are the next ones available from PORT, then |
952 | consume them and return 1. Otherwise leave the port position where | |
953 | it was and return 0. EXPECTED_CHARS should be all lowercase, and | |
954 | will be matched case-insensitively against the characters read from | |
955 | PORT. */ | |
956 | static int | |
957 | try_read_ci_chars (SCM port, const char *expected_chars) | |
958 | { | |
959 | int num_chars_wanted = strlen (expected_chars); | |
960 | int num_chars_read = 0; | |
961 | char *chars_read = alloca (num_chars_wanted); | |
962 | int c; | |
963 | ||
964 | while (num_chars_read < num_chars_wanted) | |
965 | { | |
966 | c = scm_getc (port); | |
967 | if (c == EOF) | |
968 | break; | |
969 | else if (tolower (c) != expected_chars[num_chars_read]) | |
970 | { | |
971 | scm_ungetc (c, port); | |
972 | break; | |
973 | } | |
974 | else | |
975 | chars_read[num_chars_read++] = c; | |
976 | } | |
977 | ||
978 | if (num_chars_read == num_chars_wanted) | |
979 | return 1; | |
980 | else | |
981 | { | |
982 | while (num_chars_read > 0) | |
983 | scm_ungetc (chars_read[--num_chars_read], port); | |
984 | return 0; | |
985 | } | |
986 | } | |
987 | ||
7337d56d LC |
988 | \f |
989 | /* Sharp readers, i.e. readers called after a `#' sign has been read. */ | |
990 | ||
991 | static SCM | |
992 | scm_read_boolean (int chr, SCM port) | |
993 | { | |
994 | switch (chr) | |
0f2d19dd | 995 | { |
7337d56d LC |
996 | case 't': |
997 | case 'T': | |
7a329029 | 998 | try_read_ci_chars (port, "rue"); |
7337d56d LC |
999 | return SCM_BOOL_T; |
1000 | ||
1001 | case 'f': | |
1002 | case 'F': | |
7a329029 | 1003 | try_read_ci_chars (port, "alse"); |
7337d56d | 1004 | return SCM_BOOL_F; |
0f2d19dd | 1005 | } |
7337d56d LC |
1006 | |
1007 | return SCM_UNSPECIFIED; | |
1008 | } | |
1009 | ||
1010 | static SCM | |
b1b5433d | 1011 | scm_read_character (scm_t_wchar chr, SCM port, scm_t_read_opts *opts) |
7337d56d LC |
1012 | #define FUNC_NAME "scm_lreadr" |
1013 | { | |
69f90b0b MG |
1014 | char buffer[READER_CHAR_NAME_MAX_SIZE]; |
1015 | SCM charname; | |
1016 | size_t charname_len, bytes_read; | |
889975e5 MG |
1017 | scm_t_wchar cp; |
1018 | int overflow; | |
69f90b0b | 1019 | scm_t_port *pt; |
889975e5 | 1020 | |
b1b5433d MW |
1021 | overflow = read_token (port, opts, buffer, READER_CHAR_NAME_MAX_SIZE, |
1022 | &bytes_read); | |
889975e5 | 1023 | if (overflow) |
c1a0ba1c | 1024 | scm_i_input_error (FUNC_NAME, port, "character name too long", SCM_EOL); |
7337d56d | 1025 | |
69f90b0b | 1026 | if (bytes_read == 0) |
0f2d19dd | 1027 | { |
7337d56d LC |
1028 | chr = scm_getc (port); |
1029 | if (chr == EOF) | |
1030 | scm_i_input_error (FUNC_NAME, port, "unexpected end of file " | |
1031 | "while reading character", SCM_EOL); | |
1032 | ||
1033 | /* CHR must be a token delimiter, like a whitespace. */ | |
1034 | return (SCM_MAKE_CHAR (chr)); | |
0f2d19dd | 1035 | } |
7337d56d | 1036 | |
69f90b0b | 1037 | pt = SCM_PTAB_ENTRY (port); |
7337d56d | 1038 | |
69f90b0b MG |
1039 | /* Simple ASCII characters can be processed immediately. Also, simple |
1040 | ISO-8859-1 characters can be processed immediately if the encoding for this | |
1041 | port is ISO-8859-1. */ | |
1042 | if (bytes_read == 1 && ((unsigned char) buffer[0] <= 127 || pt->encoding == NULL)) | |
1043 | { | |
1044 | SCM_COL (port) += 1; | |
1045 | return SCM_MAKE_CHAR (buffer[0]); | |
1046 | } | |
1047 | ||
1048 | /* Otherwise, convert the buffer into a proper scheme string for | |
1049 | processing. */ | |
1050 | charname = scm_from_stringn (buffer, bytes_read, pt->encoding, | |
1051 | pt->ilseq_handler); | |
1052 | charname_len = scm_i_string_length (charname); | |
1053 | SCM_COL (port) += charname_len; | |
889975e5 | 1054 | cp = scm_i_string_ref (charname, 0); |
69f90b0b MG |
1055 | if (charname_len == 1) |
1056 | return SCM_MAKE_CHAR (cp); | |
1057 | ||
1058 | /* Ignore dotted circles, which may be used to keep combining characters from | |
1059 | combining with the backslash in #\charname. */ | |
0dcd7e61 MG |
1060 | if (cp == SCM_CODEPOINT_DOTTED_CIRCLE && charname_len == 2) |
1061 | return SCM_MAKE_CHAR (scm_i_string_ref (charname, 1)); | |
1062 | ||
889975e5 | 1063 | if (cp >= '0' && cp < '8') |
7337d56d LC |
1064 | { |
1065 | /* Dirk:FIXME:: This type of character syntax is not R5RS | |
1066 | * compliant. Further, it should be verified that the constant | |
0ffc78e3 | 1067 | * does only consist of octal digits. */ |
889975e5 | 1068 | SCM p = scm_string_to_number (charname, scm_from_uint (8)); |
7337d56d | 1069 | if (SCM_I_INUMP (p)) |
0ffc78e3 | 1070 | { |
e25f3727 | 1071 | scm_t_wchar c = scm_to_uint32 (p); |
0ffc78e3 MG |
1072 | if (SCM_IS_UNICODE_CHAR (c)) |
1073 | return SCM_MAKE_CHAR (c); | |
1074 | else | |
0f3a70cf | 1075 | scm_i_input_error (FUNC_NAME, port, |
0ffc78e3 MG |
1076 | "out-of-range octal character escape: ~a", |
1077 | scm_list_1 (charname)); | |
1078 | } | |
7337d56d LC |
1079 | } |
1080 | ||
0f3a70cf | 1081 | if (cp == 'x' && (charname_len > 1)) |
dea901d6 MG |
1082 | { |
1083 | SCM p; | |
0f3a70cf | 1084 | |
dea901d6 MG |
1085 | /* Convert from hex, skipping the initial 'x' character in CHARNAME */ |
1086 | p = scm_string_to_number (scm_c_substring (charname, 1, charname_len), | |
1087 | scm_from_uint (16)); | |
1088 | if (SCM_I_INUMP (p)) | |
1089 | { | |
e25f3727 | 1090 | scm_t_wchar c = scm_to_uint32 (p); |
dea901d6 MG |
1091 | if (SCM_IS_UNICODE_CHAR (c)) |
1092 | return SCM_MAKE_CHAR (c); | |
1093 | else | |
1094 | scm_i_input_error (FUNC_NAME, port, | |
1095 | "out-of-range hex character escape: ~a", | |
1096 | scm_list_1 (charname)); | |
1097 | } | |
1098 | } | |
1099 | ||
889975e5 MG |
1100 | /* The names of characters should never have non-Latin1 |
1101 | characters. */ | |
1102 | if (scm_i_is_narrow_string (charname) | |
1103 | || scm_i_try_narrow_string (charname)) | |
4769c9db AW |
1104 | { SCM ch = scm_i_charname_to_char (scm_i_string_chars (charname), |
1105 | charname_len); | |
1106 | if (scm_is_true (ch)) | |
1107 | return ch; | |
1108 | } | |
7337d56d | 1109 | |
7337d56d | 1110 | scm_i_input_error (FUNC_NAME, port, "unknown character name ~a", |
889975e5 | 1111 | scm_list_1 (charname)); |
7337d56d LC |
1112 | |
1113 | return SCM_UNSPECIFIED; | |
0f2d19dd | 1114 | } |
db4b4ca6 | 1115 | #undef FUNC_NAME |
0f2d19dd | 1116 | |
cfd15439 | 1117 | static SCM |
b1b5433d | 1118 | scm_read_keyword (int chr, SCM port, scm_t_read_opts *opts) |
7337d56d LC |
1119 | { |
1120 | SCM symbol; | |
1121 | ||
1122 | /* Read the symbol that comprises the keyword. Doing this instead of | |
1123 | invoking a specific symbol reader function allows `scm_read_keyword ()' | |
1124 | to adapt to the delimiters currently valid of symbols. | |
1cc91f1b | 1125 | |
7337d56d | 1126 | XXX: This implementation allows sloppy syntaxes like `#: key'. */ |
b1b5433d | 1127 | symbol = scm_read_expression (port, opts); |
7337d56d | 1128 | if (!scm_is_symbol (symbol)) |
7f74cf9a | 1129 | scm_i_input_error ("scm_read_keyword", port, |
7337d56d LC |
1130 | "keyword prefix `~a' not followed by a symbol: ~s", |
1131 | scm_list_2 (SCM_MAKE_CHAR (chr), symbol)); | |
1132 | ||
1133 | return (scm_symbol_to_keyword (symbol)); | |
1134 | } | |
1135 | ||
cfd15439 | 1136 | static SCM |
b1b5433d MW |
1137 | scm_read_vector (int chr, SCM port, scm_t_read_opts *opts, |
1138 | long line, int column) | |
09a4f039 | 1139 | { |
7337d56d LC |
1140 | /* Note: We call `scm_read_sexp ()' rather than READER here in order to |
1141 | guarantee that it's going to do what we want. After all, this is an | |
1142 | implementation detail of `scm_read_vector ()', not a desirable | |
1143 | property. */ | |
b1b5433d MW |
1144 | return maybe_annotate_source (scm_vector (scm_read_sexp (chr, port, opts)), |
1145 | port, opts, line, column); | |
b131b233 MW |
1146 | } |
1147 | ||
493ceb99 MW |
1148 | /* Helper used by scm_read_array */ |
1149 | static int | |
1150 | read_decimal_integer (SCM port, int c, ssize_t *resp) | |
1151 | { | |
1152 | ssize_t sign = 1; | |
1153 | ssize_t res = 0; | |
1154 | int got_it = 0; | |
1155 | ||
1156 | if (c == '-') | |
1157 | { | |
1158 | sign = -1; | |
1159 | c = scm_getc (port); | |
1160 | } | |
1161 | ||
1162 | while ('0' <= c && c <= '9') | |
1163 | { | |
a662686a MW |
1164 | if (((SSIZE_MAX - (c-'0')) / 10) <= res) |
1165 | scm_i_input_error ("read_decimal_integer", port, | |
1166 | "number too large", SCM_EOL); | |
493ceb99 MW |
1167 | res = 10*res + c-'0'; |
1168 | got_it = 1; | |
1169 | c = scm_getc (port); | |
1170 | } | |
1171 | ||
1172 | if (got_it) | |
1173 | *resp = sign * res; | |
1174 | return c; | |
1175 | } | |
1176 | ||
1177 | /* Read an array. This function can also read vectors and uniform | |
1178 | vectors. Also, the conflict between '#f' and '#f32' and '#f64' is | |
1179 | handled here. | |
1180 | ||
10744b7c | 1181 | C is the first character read after the '#'. */ |
b131b233 | 1182 | static SCM |
b1b5433d | 1183 | scm_read_array (int c, SCM port, scm_t_read_opts *opts, long line, int column) |
b131b233 | 1184 | { |
493ceb99 MW |
1185 | ssize_t rank; |
1186 | scm_t_wchar tag_buf[8]; | |
1187 | int tag_len; | |
1188 | ||
1189 | SCM tag, shape = SCM_BOOL_F, elements, array; | |
1190 | ||
1191 | /* XXX - shortcut for ordinary vectors. Shouldn't be necessary but | |
1192 | the array code can not deal with zero-length dimensions yet, and | |
10744b7c | 1193 | we want to allow zero-length vectors, of course. */ |
493ceb99 | 1194 | if (c == '(') |
b1b5433d | 1195 | return scm_read_vector (c, port, opts, line, column); |
493ceb99 | 1196 | |
10744b7c | 1197 | /* Disambiguate between '#f' and uniform floating point vectors. */ |
493ceb99 MW |
1198 | if (c == 'f') |
1199 | { | |
1200 | c = scm_getc (port); | |
1201 | if (c != '3' && c != '6') | |
1202 | { | |
7a329029 MW |
1203 | if (c == 'a' && try_read_ci_chars (port, "lse")) |
1204 | return SCM_BOOL_F; | |
1205 | else if (c != EOF) | |
1206 | scm_ungetc (c, port); | |
493ceb99 MW |
1207 | return SCM_BOOL_F; |
1208 | } | |
1209 | rank = 1; | |
1210 | tag_buf[0] = 'f'; | |
1211 | tag_len = 1; | |
1212 | goto continue_reading_tag; | |
1213 | } | |
1214 | ||
1215 | /* Read rank. */ | |
1216 | rank = 1; | |
1217 | c = read_decimal_integer (port, c, &rank); | |
1218 | if (rank < 0) | |
1219 | scm_i_input_error (NULL, port, "array rank must be non-negative", | |
1220 | SCM_EOL); | |
1221 | ||
1222 | /* Read tag. */ | |
1223 | tag_len = 0; | |
1224 | continue_reading_tag: | |
1225 | while (c != EOF && c != '(' && c != '@' && c != ':' | |
1226 | && tag_len < sizeof tag_buf / sizeof tag_buf[0]) | |
1227 | { | |
1228 | tag_buf[tag_len++] = c; | |
1229 | c = scm_getc (port); | |
1230 | } | |
1231 | if (tag_len == 0) | |
1232 | tag = SCM_BOOL_T; | |
b131b233 | 1233 | else |
493ceb99 MW |
1234 | { |
1235 | tag = scm_string_to_symbol (scm_from_utf32_stringn (tag_buf, tag_len)); | |
1236 | if (tag_len == sizeof tag_buf / sizeof tag_buf[0]) | |
1237 | scm_i_input_error (NULL, port, "invalid array tag, starting with: ~a", | |
1238 | scm_list_1 (tag)); | |
1239 | } | |
1240 | ||
1241 | /* Read shape. */ | |
1242 | if (c == '@' || c == ':') | |
1243 | { | |
1244 | shape = SCM_EOL; | |
1245 | ||
1246 | do | |
1247 | { | |
1248 | ssize_t lbnd = 0, len = 0; | |
1249 | SCM s; | |
1250 | ||
1251 | if (c == '@') | |
1252 | { | |
1253 | c = scm_getc (port); | |
1254 | c = read_decimal_integer (port, c, &lbnd); | |
1255 | } | |
1256 | ||
1257 | s = scm_from_ssize_t (lbnd); | |
1258 | ||
1259 | if (c == ':') | |
1260 | { | |
1261 | c = scm_getc (port); | |
1262 | c = read_decimal_integer (port, c, &len); | |
1263 | if (len < 0) | |
1264 | scm_i_input_error (NULL, port, | |
1265 | "array length must be non-negative", | |
1266 | SCM_EOL); | |
1267 | ||
1268 | s = scm_list_2 (s, scm_from_ssize_t (lbnd+len-1)); | |
1269 | } | |
1270 | ||
1271 | shape = scm_cons (s, shape); | |
1272 | } while (c == '@' || c == ':'); | |
1273 | ||
1274 | shape = scm_reverse_x (shape, SCM_EOL); | |
1275 | } | |
1276 | ||
1277 | /* Read nested lists of elements. */ | |
1278 | if (c != '(') | |
1279 | scm_i_input_error (NULL, port, | |
1280 | "missing '(' in vector or array literal", | |
1281 | SCM_EOL); | |
b1b5433d | 1282 | elements = scm_read_sexp (c, port, opts); |
493ceb99 MW |
1283 | |
1284 | if (scm_is_false (shape)) | |
1285 | shape = scm_from_ssize_t (rank); | |
1286 | else if (scm_ilength (shape) != rank) | |
1287 | scm_i_input_error | |
1288 | (NULL, port, | |
1289 | "the number of shape specifications must match the array rank", | |
1290 | SCM_EOL); | |
1291 | ||
1292 | /* Handle special print syntax of rank zero arrays; see | |
1293 | scm_i_print_array for a rationale. */ | |
1294 | if (rank == 0) | |
1295 | { | |
1296 | if (!scm_is_pair (elements)) | |
1297 | scm_i_input_error (NULL, port, | |
1298 | "too few elements in array literal, need 1", | |
1299 | SCM_EOL); | |
1300 | if (!scm_is_null (SCM_CDR (elements))) | |
1301 | scm_i_input_error (NULL, port, | |
1302 | "too many elements in array literal, want 1", | |
1303 | SCM_EOL); | |
1304 | elements = SCM_CAR (elements); | |
1305 | } | |
1306 | ||
1307 | /* Construct array, annotate with source location, and return. */ | |
1308 | array = scm_list_to_typed_array (tag, shape, elements); | |
b1b5433d | 1309 | return maybe_annotate_source (array, port, opts, line, column); |
7337d56d | 1310 | } |
09a4f039 | 1311 | |
cfd15439 | 1312 | static SCM |
b1b5433d MW |
1313 | scm_read_srfi4_vector (int chr, SCM port, scm_t_read_opts *opts, |
1314 | long line, int column) | |
7337d56d | 1315 | { |
b1b5433d | 1316 | return scm_read_array (chr, port, opts, line, column); |
7337d56d LC |
1317 | } |
1318 | ||
0ba0b384 | 1319 | static SCM |
b1b5433d MW |
1320 | scm_read_bytevector (scm_t_wchar chr, SCM port, scm_t_read_opts *opts, |
1321 | long line, int column) | |
0ba0b384 LC |
1322 | { |
1323 | chr = scm_getc (port); | |
1324 | if (chr != 'u') | |
1325 | goto syntax; | |
1326 | ||
1327 | chr = scm_getc (port); | |
1328 | if (chr != '8') | |
1329 | goto syntax; | |
1330 | ||
1331 | chr = scm_getc (port); | |
1332 | if (chr != '(') | |
1333 | goto syntax; | |
1334 | ||
b131b233 | 1335 | return maybe_annotate_source |
b1b5433d MW |
1336 | (scm_u8_list_to_bytevector (scm_read_sexp (chr, port, opts)), |
1337 | port, opts, line, column); | |
0ba0b384 LC |
1338 | |
1339 | syntax: | |
1340 | scm_i_input_error ("read_bytevector", port, | |
1341 | "invalid bytevector prefix", | |
1342 | SCM_MAKE_CHAR (chr)); | |
1343 | return SCM_UNSPECIFIED; | |
1344 | } | |
1345 | ||
7337d56d | 1346 | static SCM |
b1b5433d MW |
1347 | scm_read_guile_bit_vector (scm_t_wchar chr, SCM port, scm_t_read_opts *opts, |
1348 | long line, int column) | |
7337d56d LC |
1349 | { |
1350 | /* Read the `#*10101'-style read syntax for bit vectors in Guile. This is | |
1351 | terribly inefficient but who cares? */ | |
1352 | SCM s_bits = SCM_EOL; | |
1353 | ||
1354 | for (chr = scm_getc (port); | |
1355 | (chr != EOF) && ((chr == '0') || (chr == '1')); | |
1356 | chr = scm_getc (port)) | |
09a4f039 | 1357 | { |
7337d56d | 1358 | s_bits = scm_cons ((chr == '0') ? SCM_BOOL_F : SCM_BOOL_T, s_bits); |
09a4f039 | 1359 | } |
7337d56d LC |
1360 | |
1361 | if (chr != EOF) | |
1362 | scm_ungetc (chr, port); | |
1363 | ||
b131b233 MW |
1364 | return maybe_annotate_source |
1365 | (scm_bitvector (scm_reverse_x (s_bits, SCM_EOL)), | |
b1b5433d | 1366 | port, opts, line, column); |
7337d56d LC |
1367 | } |
1368 | ||
cfd15439 | 1369 | static SCM |
889975e5 | 1370 | scm_read_scsh_block_comment (scm_t_wchar chr, SCM port) |
7337d56d LC |
1371 | { |
1372 | int bang_seen = 0; | |
1373 | ||
1374 | for (;;) | |
09a4f039 | 1375 | { |
58b1db5f | 1376 | int c = scm_getc (port); |
62850ef3 | 1377 | |
7337d56d LC |
1378 | if (c == EOF) |
1379 | scm_i_input_error ("skip_block_comment", port, | |
1380 | "unterminated `#! ... !#' comment", SCM_EOL); | |
1381 | ||
1382 | if (c == '!') | |
1383 | bang_seen = 1; | |
1384 | else if (c == '#' && bang_seen) | |
1385 | break; | |
1386 | else | |
1387 | bang_seen = 0; | |
1388 | } | |
1389 | ||
1390 | return SCM_UNSPECIFIED; | |
1391 | } | |
1392 | ||
9331ffd8 MW |
1393 | static void set_port_case_insensitive_p (SCM port, scm_t_read_opts *opts, |
1394 | int value); | |
bf9eb54a MW |
1395 | static void set_port_square_brackets_p (SCM port, scm_t_read_opts *opts, |
1396 | int value); | |
1397 | static void set_port_curly_infix_p (SCM port, scm_t_read_opts *opts, | |
1398 | int value); | |
9331ffd8 | 1399 | |
d7fcaec3 | 1400 | static SCM |
b1b5433d | 1401 | scm_read_shebang (scm_t_wchar chr, SCM port, scm_t_read_opts *opts) |
911b03b2 | 1402 | { |
02327c0c MW |
1403 | char name[READER_DIRECTIVE_NAME_MAX_SIZE + 1]; |
1404 | int c; | |
1405 | int i = 0; | |
1406 | ||
1407 | while (i <= READER_DIRECTIVE_NAME_MAX_SIZE) | |
911b03b2 | 1408 | { |
02327c0c MW |
1409 | c = scm_getc (port); |
1410 | if (c == EOF) | |
1411 | scm_i_input_error ("skip_block_comment", port, | |
1412 | "unterminated `#! ... !#' comment", SCM_EOL); | |
1413 | else if (('a' <= c && c <= 'z') || ('0' <= c && c <= '9') || c == '-') | |
1414 | name[i++] = c; | |
1415 | else if (CHAR_IS_DELIMITER (c)) | |
1416 | { | |
1417 | scm_ungetc (c, port); | |
1418 | name[i] = '\0'; | |
1419 | if (0 == strcmp ("r6rs", name)) | |
1420 | ; /* Silently ignore */ | |
9331ffd8 MW |
1421 | else if (0 == strcmp ("fold-case", name)) |
1422 | set_port_case_insensitive_p (port, opts, 1); | |
1423 | else if (0 == strcmp ("no-fold-case", name)) | |
1424 | set_port_case_insensitive_p (port, opts, 0); | |
bf9eb54a MW |
1425 | else if (0 == strcmp ("curly-infix", name)) |
1426 | set_port_curly_infix_p (port, opts, 1); | |
1427 | else if (0 == strcmp ("curly-infix-and-bracket-lists", name)) | |
1428 | { | |
1429 | set_port_curly_infix_p (port, opts, 1); | |
1430 | set_port_square_brackets_p (port, opts, 0); | |
1431 | } | |
02327c0c MW |
1432 | else |
1433 | break; | |
1434 | ||
1435 | return SCM_UNSPECIFIED; | |
1436 | } | |
fa746547 MW |
1437 | else |
1438 | { | |
1439 | scm_ungetc (c, port); | |
1440 | break; | |
1441 | } | |
911b03b2 | 1442 | } |
02327c0c MW |
1443 | while (i > 0) |
1444 | scm_ungetc (name[--i], port); | |
1445 | return scm_read_scsh_block_comment (chr, port); | |
911b03b2 JG |
1446 | } |
1447 | ||
620c8965 LC |
1448 | static SCM |
1449 | scm_read_r6rs_block_comment (scm_t_wchar chr, SCM port) | |
1450 | { | |
1451 | /* Unlike SCSH-style block comments, SRFI-30/R6RS block comments may be | |
1452 | nested. So care must be taken. */ | |
1453 | int nesting_level = 1; | |
6d5f8c32 AW |
1454 | |
1455 | int a = scm_getc (port); | |
1456 | ||
1457 | if (a == EOF) | |
1458 | scm_i_input_error ("scm_read_r6rs_block_comment", port, | |
1459 | "unterminated `#| ... |#' comment", SCM_EOL); | |
620c8965 LC |
1460 | |
1461 | while (nesting_level > 0) | |
1462 | { | |
6d5f8c32 | 1463 | int b = scm_getc (port); |
620c8965 | 1464 | |
6d5f8c32 | 1465 | if (b == EOF) |
cd169c5a | 1466 | scm_i_input_error ("scm_read_r6rs_block_comment", port, |
620c8965 LC |
1467 | "unterminated `#| ... |#' comment", SCM_EOL); |
1468 | ||
6d5f8c32 AW |
1469 | if (a == '|' && b == '#') |
1470 | { | |
1471 | nesting_level--; | |
1472 | b = EOF; | |
1473 | } | |
1474 | else if (a == '#' && b == '|') | |
1475 | { | |
1476 | nesting_level++; | |
1477 | b = EOF; | |
1478 | } | |
1479 | ||
1480 | a = b; | |
620c8965 LC |
1481 | } |
1482 | ||
1483 | return SCM_UNSPECIFIED; | |
1484 | } | |
1485 | ||
34f3d47d | 1486 | static SCM |
b1b5433d MW |
1487 | scm_read_commented_expression (scm_t_wchar chr, SCM port, |
1488 | scm_t_read_opts *opts) | |
34f3d47d | 1489 | { |
889975e5 | 1490 | scm_t_wchar c; |
34f3d47d | 1491 | |
b1b5433d | 1492 | c = flush_ws (port, opts, (char *) NULL); |
34f3d47d AW |
1493 | if (EOF == c) |
1494 | scm_i_input_error ("read_commented_expression", port, | |
1495 | "no expression after #; comment", SCM_EOL); | |
1496 | scm_ungetc (c, port); | |
b1b5433d | 1497 | scm_read_expression (port, opts); |
34f3d47d AW |
1498 | return SCM_UNSPECIFIED; |
1499 | } | |
1500 | ||
7337d56d | 1501 | static SCM |
889975e5 | 1502 | scm_read_extended_symbol (scm_t_wchar chr, SCM port) |
7337d56d LC |
1503 | { |
1504 | /* Guile's extended symbol read syntax looks like this: | |
1505 | ||
1506 | #{This is all a symbol name}# | |
1507 | ||
1508 | So here, CHR is expected to be `{'. */ | |
d9527cfa | 1509 | int saw_brace = 0; |
7337d56d | 1510 | size_t len = 0; |
190d4b0d | 1511 | SCM buf = scm_i_make_string (1024, NULL, 0); |
7337d56d | 1512 | |
889975e5 | 1513 | buf = scm_i_string_start_writing (buf); |
7337d56d LC |
1514 | |
1515 | while ((chr = scm_getc (port)) != EOF) | |
1516 | { | |
1517 | if (saw_brace) | |
09a4f039 | 1518 | { |
7337d56d LC |
1519 | if (chr == '#') |
1520 | { | |
7337d56d LC |
1521 | break; |
1522 | } | |
1523 | else | |
1524 | { | |
1525 | saw_brace = 0; | |
889975e5 | 1526 | scm_i_string_set_x (buf, len++, '}'); |
7337d56d | 1527 | } |
09a4f039 | 1528 | } |
d9527cfa AW |
1529 | |
1530 | if (chr == '}') | |
7337d56d | 1531 | saw_brace = 1; |
d9527cfa AW |
1532 | else if (chr == '\\') |
1533 | { | |
1534 | /* It used to be that print.c would print extended-read-syntax | |
1535 | symbols with backslashes before "non-standard" chars, but | |
1536 | this routine wouldn't do anything with those escapes. | |
1537 | Bummer. What we've done is to change print.c to output | |
1538 | R6RS hex escapes for those characters, relying on the fact | |
1539 | that the extended read syntax would never put a `\' before | |
1540 | an `x'. For now, we just ignore other instances of | |
1541 | backslash in the string. */ | |
1542 | switch ((chr = scm_getc (port))) | |
1543 | { | |
1544 | case EOF: | |
1545 | goto done; | |
1546 | case 'x': | |
1547 | { | |
1548 | scm_t_wchar c; | |
1549 | ||
1550 | SCM_READ_HEX_ESCAPE (10, ';'); | |
1551 | scm_i_string_set_x (buf, len++, c); | |
1552 | break; | |
1553 | ||
1554 | str_eof: | |
1555 | chr = EOF; | |
1556 | goto done; | |
1557 | ||
1558 | bad_escaped: | |
1559 | scm_i_string_stop_writing (); | |
1560 | scm_i_input_error ("scm_read_extended_symbol", port, | |
1561 | "illegal character in escape sequence: ~S", | |
1562 | scm_list_1 (SCM_MAKE_CHAR (c))); | |
1563 | break; | |
1564 | } | |
1565 | default: | |
1566 | scm_i_string_set_x (buf, len++, chr); | |
1567 | break; | |
1568 | } | |
1569 | } | |
7337d56d | 1570 | else |
d9527cfa | 1571 | scm_i_string_set_x (buf, len++, chr); |
62850ef3 | 1572 | |
889975e5 | 1573 | if (len >= scm_i_string_length (buf) - 2) |
7337d56d | 1574 | { |
7f991c7d LC |
1575 | SCM addy; |
1576 | ||
889975e5 | 1577 | scm_i_string_stop_writing (); |
190d4b0d | 1578 | addy = scm_i_make_string (1024, NULL, 0); |
889975e5 | 1579 | buf = scm_string_append (scm_list_2 (buf, addy)); |
7337d56d | 1580 | len = 0; |
889975e5 | 1581 | buf = scm_i_string_start_writing (buf); |
7337d56d | 1582 | } |
7337d56d | 1583 | } |
d9527cfa AW |
1584 | |
1585 | done: | |
889975e5 | 1586 | scm_i_string_stop_writing (); |
d9527cfa AW |
1587 | if (chr == EOF) |
1588 | scm_i_input_error ("scm_read_extended_symbol", port, | |
1589 | "end of file while reading symbol", SCM_EOL); | |
7337d56d | 1590 | |
889975e5 | 1591 | return (scm_string_to_symbol (scm_c_substring (buf, 0, len))); |
7337d56d LC |
1592 | } |
1593 | ||
1594 | ||
1595 | \f | |
1596 | /* Top-level token readers, i.e., dispatchers. */ | |
1597 | ||
1598 | static SCM | |
b1b5433d | 1599 | scm_read_sharp_extension (int chr, SCM port, scm_t_read_opts *opts) |
7337d56d LC |
1600 | { |
1601 | SCM proc; | |
1602 | ||
1603 | proc = scm_get_hash_procedure (chr); | |
1604 | if (scm_is_true (scm_procedure_p (proc))) | |
1605 | { | |
1606 | long line = SCM_LINUM (port); | |
1607 | int column = SCM_COL (port) - 2; | |
1608 | SCM got; | |
1609 | ||
1610 | got = scm_call_2 (proc, SCM_MAKE_CHAR (chr), port); | |
26c8cc14 | 1611 | |
3655ed89 MW |
1612 | if (opts->record_positions_p && SCM_NIMP (got) |
1613 | && !scm_i_has_source_properties (got)) | |
26c8cc14 AW |
1614 | scm_i_set_source_properties_x (got, line, column, SCM_FILENAME (port)); |
1615 | ||
1616 | return got; | |
09a4f039 | 1617 | } |
7337d56d LC |
1618 | |
1619 | return SCM_UNSPECIFIED; | |
1620 | } | |
1621 | ||
1622 | /* The reader for the sharp `#' character. It basically dispatches reads | |
1623 | among the above token readers. */ | |
1624 | static SCM | |
b1b5433d MW |
1625 | scm_read_sharp (scm_t_wchar chr, SCM port, scm_t_read_opts *opts, |
1626 | long line, int column) | |
7337d56d LC |
1627 | #define FUNC_NAME "scm_lreadr" |
1628 | { | |
1629 | SCM result; | |
1630 | ||
1631 | chr = scm_getc (port); | |
1632 | ||
b1b5433d | 1633 | result = scm_read_sharp_extension (chr, port, opts); |
7337d56d LC |
1634 | if (!scm_is_eq (result, SCM_UNSPECIFIED)) |
1635 | return result; | |
1636 | ||
1637 | switch (chr) | |
1638 | { | |
1639 | case '\\': | |
b1b5433d | 1640 | return (scm_read_character (chr, port, opts)); |
7337d56d | 1641 | case '(': |
b1b5433d | 1642 | return (scm_read_vector (chr, port, opts, line, column)); |
7337d56d LC |
1643 | case 's': |
1644 | case 'u': | |
1645 | case 'f': | |
df941b5b | 1646 | case 'c': |
7337d56d | 1647 | /* This one may return either a boolean or an SRFI-4 vector. */ |
b1b5433d | 1648 | return (scm_read_srfi4_vector (chr, port, opts, line, column)); |
0ba0b384 | 1649 | case 'v': |
b1b5433d | 1650 | return (scm_read_bytevector (chr, port, opts, line, column)); |
7337d56d | 1651 | case '*': |
b1b5433d | 1652 | return (scm_read_guile_bit_vector (chr, port, opts, line, column)); |
7337d56d LC |
1653 | case 't': |
1654 | case 'T': | |
1655 | case 'F': | |
7337d56d LC |
1656 | return (scm_read_boolean (chr, port)); |
1657 | case ':': | |
b1b5433d | 1658 | return (scm_read_keyword (chr, port, opts)); |
7337d56d LC |
1659 | case '0': case '1': case '2': case '3': case '4': |
1660 | case '5': case '6': case '7': case '8': case '9': | |
1661 | case '@': | |
1662 | #if SCM_ENABLE_DEPRECATED | |
1663 | /* See below for 'i' and 'e'. */ | |
1664 | case 'a': | |
7337d56d LC |
1665 | case 'y': |
1666 | case 'h': | |
1667 | case 'l': | |
1668 | #endif | |
b1b5433d | 1669 | return (scm_read_array (chr, port, opts, line, column)); |
7337d56d LC |
1670 | |
1671 | case 'i': | |
1672 | case 'e': | |
1673 | #if SCM_ENABLE_DEPRECATED | |
1674 | { | |
1675 | /* When next char is '(', it really is an old-style | |
1676 | uniform array. */ | |
889975e5 | 1677 | scm_t_wchar next_c = scm_getc (port); |
7337d56d LC |
1678 | if (next_c != EOF) |
1679 | scm_ungetc (next_c, port); | |
1680 | if (next_c == '(') | |
b1b5433d | 1681 | return scm_read_array (chr, port, opts, line, column); |
7337d56d LC |
1682 | /* Fall through. */ |
1683 | } | |
1684 | #endif | |
1685 | case 'b': | |
1686 | case 'B': | |
1687 | case 'o': | |
1688 | case 'O': | |
1689 | case 'd': | |
1690 | case 'D': | |
1691 | case 'x': | |
1692 | case 'X': | |
1693 | case 'I': | |
1694 | case 'E': | |
b1b5433d | 1695 | return (scm_read_number_and_radix (chr, port, opts)); |
7337d56d LC |
1696 | case '{': |
1697 | return (scm_read_extended_symbol (chr, port)); | |
1698 | case '!': | |
b1b5433d | 1699 | return (scm_read_shebang (chr, port, opts)); |
34f3d47d | 1700 | case ';': |
b1b5433d | 1701 | return (scm_read_commented_expression (chr, port, opts)); |
34f3d47d AW |
1702 | case '`': |
1703 | case '\'': | |
1704 | case ',': | |
b1b5433d | 1705 | return (scm_read_syntax (chr, port, opts)); |
7c4aad9c | 1706 | case 'n': |
b1b5433d | 1707 | return (scm_read_nil (chr, port, opts)); |
7337d56d | 1708 | default: |
b1b5433d | 1709 | result = scm_read_sharp_extension (chr, port, opts); |
7337d56d | 1710 | if (scm_is_eq (result, SCM_UNSPECIFIED)) |
620c8965 LC |
1711 | { |
1712 | /* To remain compatible with 1.8 and earlier, the following | |
1713 | characters have lower precedence than `read-hash-extend' | |
1714 | characters. */ | |
1715 | switch (chr) | |
1716 | { | |
1717 | case '|': | |
1718 | return scm_read_r6rs_block_comment (chr, port); | |
1719 | default: | |
1720 | scm_i_input_error (FUNC_NAME, port, "Unknown # object: ~S", | |
1721 | scm_list_1 (SCM_MAKE_CHAR (chr))); | |
1722 | } | |
1723 | } | |
7337d56d LC |
1724 | else |
1725 | return result; | |
1726 | } | |
1727 | ||
1728 | return SCM_UNSPECIFIED; | |
1729 | } | |
1730 | #undef FUNC_NAME | |
1731 | ||
1732 | static SCM | |
bf9eb54a MW |
1733 | read_inner_expression (SCM port, scm_t_read_opts *opts) |
1734 | #define FUNC_NAME "read_inner_expression" | |
7337d56d LC |
1735 | { |
1736 | while (1) | |
1737 | { | |
cfd15439 | 1738 | scm_t_wchar chr; |
7337d56d LC |
1739 | |
1740 | chr = scm_getc (port); | |
1741 | ||
1742 | switch (chr) | |
1743 | { | |
1744 | case SCM_WHITE_SPACES: | |
1745 | case SCM_LINE_INCREMENTORS: | |
1746 | break; | |
1747 | case ';': | |
1748 | (void) scm_read_semicolon_comment (chr, port); | |
1749 | break; | |
bf9eb54a MW |
1750 | case '{': |
1751 | if (opts->curly_infix_p) | |
1752 | { | |
1753 | if (opts->neoteric_p) | |
1754 | return scm_read_sexp (chr, port, opts); | |
1755 | else | |
1756 | { | |
1757 | SCM expr; | |
1758 | ||
1759 | /* Enable neoteric expressions within curly braces */ | |
1760 | opts->neoteric_p = 1; | |
1761 | expr = scm_read_sexp (chr, port, opts); | |
1762 | opts->neoteric_p = 0; | |
1763 | return expr; | |
1764 | } | |
1765 | } | |
1766 | else | |
1767 | return scm_read_mixed_case_symbol (chr, port, opts); | |
5afa815c | 1768 | case '[': |
bf9eb54a MW |
1769 | if (opts->square_brackets_p) |
1770 | return scm_read_sexp (chr, port, opts); | |
1771 | else if (opts->curly_infix_p) | |
1772 | { | |
1773 | /* The syntax of neoteric expressions requires that '[' be | |
1774 | a delimiter when curly-infix is enabled, so it cannot | |
1775 | be part of an unescaped symbol. We might as well do | |
1776 | something useful with it, so we adopt Kawa's convention: | |
1777 | [...] => ($bracket-list$ ...) */ | |
1778 | long line = SCM_LINUM (port); | |
1779 | int column = SCM_COL (port) - 1; | |
1780 | return maybe_annotate_source | |
1781 | (scm_cons (sym_bracket_list, scm_read_sexp (chr, port, opts)), | |
1782 | port, opts, line, column); | |
1783 | } | |
1784 | else | |
1785 | return scm_read_mixed_case_symbol (chr, port, opts); | |
7337d56d | 1786 | case '(': |
b1b5433d | 1787 | return (scm_read_sexp (chr, port, opts)); |
7337d56d | 1788 | case '"': |
b1b5433d | 1789 | return (scm_read_string (chr, port, opts)); |
7337d56d LC |
1790 | case '\'': |
1791 | case '`': | |
1792 | case ',': | |
b1b5433d | 1793 | return (scm_read_quote (chr, port, opts)); |
7337d56d LC |
1794 | case '#': |
1795 | { | |
b131b233 MW |
1796 | long line = SCM_LINUM (port); |
1797 | int column = SCM_COL (port) - 1; | |
b1b5433d | 1798 | SCM result = scm_read_sharp (chr, port, opts, line, column); |
7337d56d LC |
1799 | if (scm_is_eq (result, SCM_UNSPECIFIED)) |
1800 | /* We read a comment or some such. */ | |
1801 | break; | |
1802 | else | |
1803 | return result; | |
1804 | } | |
1805 | case ')': | |
1806 | scm_i_input_error (FUNC_NAME, port, "unexpected \")\"", SCM_EOL); | |
1807 | break; | |
bf9eb54a MW |
1808 | case '}': |
1809 | if (opts->curly_infix_p) | |
1810 | scm_i_input_error (FUNC_NAME, port, "unexpected \"}\"", SCM_EOL); | |
1811 | else | |
1812 | return scm_read_mixed_case_symbol (chr, port, opts); | |
a4e47229 | 1813 | case ']': |
b1b5433d | 1814 | if (opts->square_brackets_p) |
a4e47229 MG |
1815 | scm_i_input_error (FUNC_NAME, port, "unexpected \"]\"", SCM_EOL); |
1816 | /* otherwise fall through */ | |
7337d56d LC |
1817 | case EOF: |
1818 | return SCM_EOF_VAL; | |
1819 | case ':': | |
b1b5433d MW |
1820 | if (opts->keyword_style == KEYWORD_STYLE_PREFIX) |
1821 | return scm_symbol_to_keyword (scm_read_expression (port, opts)); | |
7337d56d LC |
1822 | /* Fall through. */ |
1823 | ||
1824 | default: | |
1825 | { | |
1826 | if (((chr >= '0') && (chr <= '9')) | |
1827 | || (strchr ("+-.", chr))) | |
b1b5433d | 1828 | return (scm_read_number (chr, port, opts)); |
7337d56d | 1829 | else |
b1b5433d | 1830 | return (scm_read_mixed_case_symbol (chr, port, opts)); |
7337d56d LC |
1831 | } |
1832 | } | |
1833 | } | |
1834 | } | |
1835 | #undef FUNC_NAME | |
1836 | ||
bf9eb54a MW |
1837 | static SCM |
1838 | scm_read_expression (SCM port, scm_t_read_opts *opts) | |
1839 | #define FUNC_NAME "scm_read_expression" | |
1840 | { | |
1841 | if (!opts->neoteric_p) | |
1842 | return read_inner_expression (port, opts); | |
1843 | else | |
1844 | { | |
1845 | long line = 0; | |
1846 | int column = 0; | |
1847 | SCM expr; | |
1848 | ||
1849 | if (opts->record_positions_p) | |
1850 | { | |
1851 | /* We need to get the position of the first non-whitespace | |
1852 | character in order to correctly annotate neoteric | |
1853 | expressions. For example, for the expression 'f(x)', the | |
1854 | first call to 'read_inner_expression' reads the 'f' (which | |
1855 | cannot be annotated), and then we later read the '(x)' and | |
1856 | use it to construct the new list (f x). */ | |
1857 | int c = flush_ws (port, opts, (char *) NULL); | |
1858 | if (c == EOF) | |
1859 | return SCM_EOF_VAL; | |
1860 | scm_ungetc (c, port); | |
1861 | line = SCM_LINUM (port); | |
1862 | column = SCM_COL (port); | |
1863 | } | |
1864 | ||
1865 | expr = read_inner_expression (port, opts); | |
1866 | ||
1867 | /* 'expr' is the first component of the neoteric expression. Now | |
1868 | we loop, and as long as the next character is '(', '[', or '{', | |
1869 | (without any intervening whitespace), we use it to construct a | |
1870 | new expression. For example, f{n - 1}(x) => ((f (- n 1)) x). */ | |
1871 | for (;;) | |
1872 | { | |
1873 | int chr = scm_getc (port); | |
1874 | ||
1875 | if (chr == '(') | |
1876 | /* e(...) => (e ...) */ | |
1877 | expr = scm_cons (expr, scm_read_sexp (chr, port, opts)); | |
1878 | else if (chr == '[') | |
1879 | /* e[...] => ($bracket-apply$ e ...) */ | |
1880 | expr = scm_cons (sym_bracket_apply, | |
1881 | scm_cons (expr, | |
1882 | scm_read_sexp (chr, port, opts))); | |
1883 | else if (chr == '{') | |
1884 | { | |
1885 | SCM arg = scm_read_sexp (chr, port, opts); | |
1886 | ||
1887 | if (scm_is_null (arg)) | |
1888 | expr = scm_list_1 (expr); /* e{} => (e) */ | |
1889 | else | |
1890 | expr = scm_list_2 (expr, arg); /* e{...} => (e {...}) */ | |
1891 | } | |
1892 | else | |
1893 | { | |
1894 | if (chr != EOF) | |
1895 | scm_ungetc (chr, port); | |
1896 | break; | |
1897 | } | |
1898 | maybe_annotate_source (expr, port, opts, line, column); | |
1899 | } | |
1900 | return expr; | |
1901 | } | |
1902 | } | |
1903 | #undef FUNC_NAME | |
1904 | ||
7337d56d LC |
1905 | \f |
1906 | /* Actual reader. */ | |
1907 | ||
ea8c9761 MW |
1908 | static void init_read_options (SCM port, scm_t_read_opts *opts); |
1909 | ||
7337d56d LC |
1910 | SCM_DEFINE (scm_read, "read", 0, 1, 0, |
1911 | (SCM port), | |
1912 | "Read an s-expression from the input port @var{port}, or from\n" | |
1913 | "the current input port if @var{port} is not specified.\n" | |
1914 | "Any whitespace before the next token is discarded.") | |
1915 | #define FUNC_NAME s_scm_read | |
1916 | { | |
b1b5433d | 1917 | scm_t_read_opts opts; |
7337d56d LC |
1918 | int c; |
1919 | ||
1920 | if (SCM_UNBNDP (port)) | |
1921 | port = scm_current_input_port (); | |
1922 | SCM_VALIDATE_OPINPORT (1, port); | |
1923 | ||
ea8c9761 | 1924 | init_read_options (port, &opts); |
b1b5433d MW |
1925 | |
1926 | c = flush_ws (port, &opts, (char *) NULL); | |
7337d56d LC |
1927 | if (EOF == c) |
1928 | return SCM_EOF_VAL; | |
1929 | scm_ungetc (c, port); | |
1930 | ||
b1b5433d | 1931 | return (scm_read_expression (port, &opts)); |
09a4f039 | 1932 | } |
db4b4ca6 | 1933 | #undef FUNC_NAME |
09a4f039 | 1934 | |
0f2d19dd JB |
1935 | |
1936 | \f | |
1937 | ||
14de3b42 GH |
1938 | /* Manipulate the read-hash-procedures alist. This could be written in |
1939 | Scheme, but maybe it will also be used by C code during initialisation. */ | |
a1ec6916 | 1940 | SCM_DEFINE (scm_read_hash_extend, "read-hash-extend", 2, 0, 0, |
1bbd0b84 | 1941 | (SCM chr, SCM proc), |
dc7fa443 MG |
1942 | "Install the procedure @var{proc} for reading expressions\n" |
1943 | "starting with the character sequence @code{#} and @var{chr}.\n" | |
1944 | "@var{proc} will be called with two arguments: the character\n" | |
1945 | "@var{chr} and the port to read further data from. The object\n" | |
391f57e6 HWN |
1946 | "returned will be the return value of @code{read}. \n" |
1947 | "Passing @code{#f} for @var{proc} will remove a previous setting. \n" | |
1948 | ) | |
1bbd0b84 | 1949 | #define FUNC_NAME s_scm_read_hash_extend |
deca31e1 | 1950 | { |
fed9c9a2 GH |
1951 | SCM this; |
1952 | SCM prev; | |
1953 | ||
36284627 | 1954 | SCM_VALIDATE_CHAR (1, chr); |
7888309b | 1955 | SCM_ASSERT (scm_is_false (proc) |
bc36d050 | 1956 | || scm_is_eq (scm_procedure_p (proc), SCM_BOOL_T), |
36284627 | 1957 | proc, SCM_ARG2, FUNC_NAME); |
fed9c9a2 | 1958 | |
14de3b42 | 1959 | /* Check if chr is already in the alist. */ |
d458073b | 1960 | this = scm_i_read_hash_procedures_ref (); |
14de3b42 | 1961 | prev = SCM_BOOL_F; |
fed9c9a2 GH |
1962 | while (1) |
1963 | { | |
d2e53ed6 | 1964 | if (scm_is_null (this)) |
fed9c9a2 GH |
1965 | { |
1966 | /* not found, so add it to the beginning. */ | |
7888309b | 1967 | if (scm_is_true (proc)) |
fed9c9a2 | 1968 | { |
d458073b AR |
1969 | SCM new = scm_cons (scm_cons (chr, proc), |
1970 | scm_i_read_hash_procedures_ref ()); | |
1971 | scm_i_read_hash_procedures_set_x (new); | |
fed9c9a2 GH |
1972 | } |
1973 | break; | |
1974 | } | |
bc36d050 | 1975 | if (scm_is_eq (chr, SCM_CAAR (this))) |
fed9c9a2 GH |
1976 | { |
1977 | /* already in the alist. */ | |
7888309b | 1978 | if (scm_is_false (proc)) |
14de3b42 GH |
1979 | { |
1980 | /* remove it. */ | |
7888309b | 1981 | if (scm_is_false (prev)) |
14de3b42 | 1982 | { |
d458073b AR |
1983 | SCM rest = SCM_CDR (scm_i_read_hash_procedures_ref ()); |
1984 | scm_i_read_hash_procedures_set_x (rest); | |
14de3b42 GH |
1985 | } |
1986 | else | |
1987 | scm_set_cdr_x (prev, SCM_CDR (this)); | |
1988 | } | |
fed9c9a2 | 1989 | else |
14de3b42 GH |
1990 | { |
1991 | /* replace it. */ | |
1992 | scm_set_cdr_x (SCM_CAR (this), proc); | |
1993 | } | |
fed9c9a2 GH |
1994 | break; |
1995 | } | |
1996 | prev = this; | |
1997 | this = SCM_CDR (this); | |
1998 | } | |
deca31e1 | 1999 | |
deca31e1 GH |
2000 | return SCM_UNSPECIFIED; |
2001 | } | |
1bbd0b84 | 2002 | #undef FUNC_NAME |
0f2d19dd | 2003 | |
deca31e1 GH |
2004 | /* Recover the read-hash procedure corresponding to char c. */ |
2005 | static SCM | |
6e8d25a6 | 2006 | scm_get_hash_procedure (int c) |
deca31e1 | 2007 | { |
d458073b | 2008 | SCM rest = scm_i_read_hash_procedures_ref (); |
fed9c9a2 | 2009 | |
deca31e1 GH |
2010 | while (1) |
2011 | { | |
d2e53ed6 | 2012 | if (scm_is_null (rest)) |
deca31e1 GH |
2013 | return SCM_BOOL_F; |
2014 | ||
7866a09b | 2015 | if (SCM_CHAR (SCM_CAAR (rest)) == c) |
deca31e1 GH |
2016 | return SCM_CDAR (rest); |
2017 | ||
2018 | rest = SCM_CDR (rest); | |
2019 | } | |
2020 | } | |
1cc91f1b | 2021 | |
889975e5 MG |
2022 | #define SCM_ENCODING_SEARCH_SIZE (500) |
2023 | ||
f8a1c9a8 LC |
2024 | /* Search the first few hundred characters of a file for an Emacs-like coding |
2025 | declaration. Returns either NULL or a string whose storage has been | |
2026 | allocated with `scm_gc_malloc ()'. */ | |
889975e5 | 2027 | char * |
f8a1c9a8 | 2028 | scm_i_scan_for_encoding (SCM port) |
889975e5 | 2029 | { |
d900843c | 2030 | scm_t_port *pt; |
889975e5 | 2031 | char header[SCM_ENCODING_SEARCH_SIZE+1]; |
daedbca7 | 2032 | size_t bytes_read, encoding_length, i; |
889975e5 | 2033 | char *encoding = NULL; |
daedbca7 | 2034 | char *pos, *encoding_start; |
889975e5 MG |
2035 | int in_comment; |
2036 | ||
d900843c | 2037 | pt = SCM_PTAB_ENTRY (port); |
49bb5bd3 | 2038 | |
d900843c AW |
2039 | if (pt->rw_active == SCM_PORT_WRITE) |
2040 | scm_flush (port); | |
49bb5bd3 | 2041 | |
d900843c AW |
2042 | if (pt->rw_random) |
2043 | pt->rw_active = SCM_PORT_READ; | |
2044 | ||
2045 | if (pt->read_pos == pt->read_end) | |
2046 | { | |
2047 | /* We can use the read buffer, and thus avoid a seek. */ | |
2048 | if (scm_fill_input (port) == EOF) | |
2049 | return NULL; | |
2050 | ||
2051 | bytes_read = pt->read_end - pt->read_pos; | |
2052 | if (bytes_read > SCM_ENCODING_SEARCH_SIZE) | |
2053 | bytes_read = SCM_ENCODING_SEARCH_SIZE; | |
2054 | ||
2055 | if (bytes_read <= 1) | |
2056 | /* An unbuffered port -- don't scan. */ | |
2057 | return NULL; | |
2058 | ||
2059 | memcpy (header, pt->read_pos, bytes_read); | |
2060 | header[bytes_read] = '\0'; | |
2061 | } | |
2062 | else | |
2063 | { | |
2064 | /* Try to read some bytes and then seek back. Not all ports | |
2065 | support seeking back; and indeed some file ports (like | |
2066 | /dev/urandom) will succeed on an lseek (fd, 0, SEEK_CUR)---the | |
2067 | check performed by SCM_FPORT_FDES---but fail to seek | |
2068 | backwards. Hence this block comes second. We prefer to use | |
2069 | the read buffer in-place. */ | |
2070 | if (SCM_FPORTP (port) && !SCM_FDES_RANDOM_P (SCM_FPORT_FDES (port))) | |
2071 | return NULL; | |
2072 | ||
2073 | bytes_read = scm_c_read (port, header, SCM_ENCODING_SEARCH_SIZE); | |
2074 | header[bytes_read] = '\0'; | |
419c8736 | 2075 | scm_seek (port, scm_from_int (0), scm_from_int (SEEK_SET)); |
d900843c | 2076 | } |
889975e5 | 2077 | |
889975e5 MG |
2078 | /* search past "coding[:=]" */ |
2079 | pos = header; | |
2080 | while (1) | |
2081 | { | |
2082 | if ((pos = strstr(pos, "coding")) == NULL) | |
2083 | return NULL; | |
2084 | ||
2085 | pos += strlen("coding"); | |
2086 | if (pos - header >= SCM_ENCODING_SEARCH_SIZE || | |
2087 | (*pos == ':' || *pos == '=')) | |
2088 | { | |
2089 | pos ++; | |
2090 | break; | |
2091 | } | |
2092 | } | |
2093 | ||
2094 | /* skip spaces */ | |
2095 | while (pos - header <= SCM_ENCODING_SEARCH_SIZE && | |
2096 | (*pos == ' ' || *pos == '\t')) | |
2097 | pos ++; | |
2098 | ||
2099 | /* grab the next token */ | |
daedbca7 | 2100 | encoding_start = pos; |
889975e5 | 2101 | i = 0; |
daedbca7 MG |
2102 | while (encoding_start + i - header <= SCM_ENCODING_SEARCH_SIZE |
2103 | && encoding_start + i - header < bytes_read | |
2104 | && (isalnum ((int) encoding_start[i]) | |
2105 | || strchr ("_-.:/,+=()", encoding_start[i]) != NULL)) | |
889975e5 MG |
2106 | i++; |
2107 | ||
daedbca7 MG |
2108 | encoding_length = i; |
2109 | if (encoding_length == 0) | |
889975e5 MG |
2110 | return NULL; |
2111 | ||
daedbca7 MG |
2112 | encoding = scm_gc_strndup (encoding_start, encoding_length, "encoding"); |
2113 | for (i = 0; i < encoding_length; i++) | |
026ed239 | 2114 | encoding[i] = toupper ((int) encoding[i]); |
889975e5 MG |
2115 | |
2116 | /* push backwards to make sure we were in a comment */ | |
2117 | in_comment = 0; | |
daedbca7 MG |
2118 | pos = encoding_start; |
2119 | while (pos >= header) | |
889975e5 | 2120 | { |
8a12aeb9 AW |
2121 | if (*pos == ';') |
2122 | { | |
2123 | in_comment = 1; | |
2124 | break; | |
2125 | } | |
2126 | else if (*pos == '\n' || pos == header) | |
889975e5 MG |
2127 | { |
2128 | /* This wasn't in a semicolon comment. Check for a | |
2129 | hash-bang comment. */ | |
2130 | char *beg = strstr (header, "#!"); | |
2131 | char *end = strstr (header, "!#"); | |
8a12aeb9 | 2132 | if (beg < encoding_start && encoding_start + encoding_length <= end) |
889975e5 MG |
2133 | in_comment = 1; |
2134 | break; | |
2135 | } | |
8a12aeb9 AW |
2136 | else |
2137 | { | |
2138 | pos --; | |
2139 | continue; | |
2140 | } | |
889975e5 MG |
2141 | } |
2142 | if (!in_comment) | |
f8a1c9a8 LC |
2143 | /* This wasn't in a comment */ |
2144 | return NULL; | |
2145 | ||
889975e5 MG |
2146 | return encoding; |
2147 | } | |
2148 | ||
2149 | SCM_DEFINE (scm_file_encoding, "file-encoding", 1, 0, 0, | |
2150 | (SCM port), | |
a270e133 | 2151 | "Scans the port for an Emacs-like character coding declaration\n" |
ffb62a43 | 2152 | "near the top of the contents of a port with random-accessible contents.\n" |
889975e5 MG |
2153 | "The coding declaration is of the form\n" |
2154 | "@code{coding: XXXXX} and must appear in a scheme comment.\n" | |
2155 | "\n" | |
2156 | "Returns a string containing the character encoding of the file\n" | |
2157 | "if a declaration was found, or @code{#f} otherwise.\n") | |
2158 | #define FUNC_NAME s_scm_file_encoding | |
2159 | { | |
2160 | char *enc; | |
2161 | SCM s_enc; | |
f8a1c9a8 | 2162 | |
d900843c AW |
2163 | SCM_VALIDATE_OPINPORT (SCM_ARG1, port); |
2164 | ||
f8a1c9a8 | 2165 | enc = scm_i_scan_for_encoding (port); |
889975e5 MG |
2166 | if (enc == NULL) |
2167 | return SCM_BOOL_F; | |
2168 | else | |
2169 | { | |
2170 | s_enc = scm_from_locale_string (enc); | |
889975e5 MG |
2171 | return s_enc; |
2172 | } | |
f8a1c9a8 | 2173 | |
889975e5 MG |
2174 | return SCM_BOOL_F; |
2175 | } | |
2176 | #undef FUNC_NAME | |
2177 | ||
ea8c9761 MW |
2178 | \f |
2179 | /* Per-port read options. | |
2180 | ||
a38024ba MW |
2181 | We store per-port read options in the 'port-read-options' port |
2182 | property, which is stored in the internal port structure. The value | |
2183 | stored is a single integer that contains a two-bit field for each | |
2184 | read option. | |
ea8c9761 MW |
2185 | |
2186 | If a bit field contains READ_OPTION_INHERIT (3), that indicates that | |
2187 | the applicable value should be inherited from the corresponding | |
2188 | global read option. Otherwise, the bit field contains the value of | |
2189 | the read option. For boolean read options that have been set | |
2190 | per-port, the possible values are 0 or 1. If the 'keyword_style' | |
2191 | read option has been set per-port, its possible values are those in | |
2192 | 'enum t_keyword_style'. */ | |
2193 | ||
a38024ba | 2194 | /* Key to read options in port properties. */ |
ea8c9761 MW |
2195 | SCM_SYMBOL (sym_port_read_options, "port-read-options"); |
2196 | ||
2197 | /* Offsets of bit fields for each per-port override */ | |
2198 | #define READ_OPTION_COPY_SOURCE_P 0 | |
2199 | #define READ_OPTION_RECORD_POSITIONS_P 2 | |
2200 | #define READ_OPTION_CASE_INSENSITIVE_P 4 | |
2201 | #define READ_OPTION_KEYWORD_STYLE 6 | |
2202 | #define READ_OPTION_R6RS_ESCAPES_P 8 | |
2203 | #define READ_OPTION_SQUARE_BRACKETS_P 10 | |
2204 | #define READ_OPTION_HUNGRY_EOL_ESCAPES_P 12 | |
bf9eb54a | 2205 | #define READ_OPTION_CURLY_INFIX_P 14 |
ea8c9761 | 2206 | |
bf9eb54a MW |
2207 | /* The total width in bits of the per-port overrides */ |
2208 | #define READ_OPTIONS_NUM_BITS 16 | |
ea8c9761 MW |
2209 | |
2210 | #define READ_OPTIONS_INHERIT_ALL ((1UL << READ_OPTIONS_NUM_BITS) - 1) | |
2211 | #define READ_OPTIONS_MAX_VALUE READ_OPTIONS_INHERIT_ALL | |
2212 | ||
2213 | #define READ_OPTION_MASK 3 | |
2214 | #define READ_OPTION_INHERIT 3 | |
2215 | ||
2216 | static void | |
2217 | set_port_read_option (SCM port, int option, int new_value) | |
2218 | { | |
a38024ba | 2219 | SCM scm_read_options; |
ea8c9761 MW |
2220 | unsigned int read_options; |
2221 | ||
2222 | new_value &= READ_OPTION_MASK; | |
a38024ba | 2223 | scm_read_options = scm_i_port_property (port, sym_port_read_options); |
ea8c9761 MW |
2224 | if (scm_is_unsigned_integer (scm_read_options, 0, READ_OPTIONS_MAX_VALUE)) |
2225 | read_options = scm_to_uint (scm_read_options); | |
2226 | else | |
2227 | read_options = READ_OPTIONS_INHERIT_ALL; | |
2228 | read_options &= ~(READ_OPTION_MASK << option); | |
2229 | read_options |= new_value << option; | |
2230 | scm_read_options = scm_from_uint (read_options); | |
a38024ba | 2231 | scm_i_set_port_property_x (port, sym_port_read_options, scm_read_options); |
ea8c9761 MW |
2232 | } |
2233 | ||
9331ffd8 MW |
2234 | /* Set OPTS and PORT's case-insensitivity according to VALUE. */ |
2235 | static void | |
2236 | set_port_case_insensitive_p (SCM port, scm_t_read_opts *opts, int value) | |
2237 | { | |
2238 | value = !!value; | |
2239 | opts->case_insensitive_p = value; | |
2240 | set_port_read_option (port, READ_OPTION_CASE_INSENSITIVE_P, value); | |
2241 | } | |
2242 | ||
bf9eb54a MW |
2243 | /* Set OPTS and PORT's square_brackets_p option according to VALUE. */ |
2244 | static void | |
2245 | set_port_square_brackets_p (SCM port, scm_t_read_opts *opts, int value) | |
2246 | { | |
2247 | value = !!value; | |
2248 | opts->square_brackets_p = value; | |
2249 | set_port_read_option (port, READ_OPTION_SQUARE_BRACKETS_P, value); | |
2250 | } | |
2251 | ||
2252 | /* Set OPTS and PORT's curly_infix_p option according to VALUE. */ | |
2253 | static void | |
2254 | set_port_curly_infix_p (SCM port, scm_t_read_opts *opts, int value) | |
2255 | { | |
2256 | value = !!value; | |
2257 | opts->curly_infix_p = value; | |
2258 | set_port_read_option (port, READ_OPTION_CURLY_INFIX_P, value); | |
2259 | } | |
2260 | ||
ea8c9761 MW |
2261 | /* Initialize OPTS based on PORT's read options and the global read |
2262 | options. */ | |
2263 | static void | |
2264 | init_read_options (SCM port, scm_t_read_opts *opts) | |
2265 | { | |
a38024ba | 2266 | SCM val, scm_read_options; |
ea8c9761 MW |
2267 | unsigned int read_options, x; |
2268 | ||
a38024ba | 2269 | scm_read_options = scm_i_port_property (port, sym_port_read_options); |
ea8c9761 MW |
2270 | |
2271 | if (scm_is_unsigned_integer (scm_read_options, 0, READ_OPTIONS_MAX_VALUE)) | |
2272 | read_options = scm_to_uint (scm_read_options); | |
2273 | else | |
2274 | read_options = READ_OPTIONS_INHERIT_ALL; | |
2275 | ||
2276 | x = READ_OPTION_MASK & (read_options >> READ_OPTION_KEYWORD_STYLE); | |
2277 | if (x == READ_OPTION_INHERIT) | |
2278 | { | |
2279 | val = SCM_PACK (SCM_KEYWORD_STYLE); | |
2280 | if (scm_is_eq (val, scm_keyword_prefix)) | |
2281 | x = KEYWORD_STYLE_PREFIX; | |
2282 | else if (scm_is_eq (val, scm_keyword_postfix)) | |
2283 | x = KEYWORD_STYLE_POSTFIX; | |
2284 | else | |
2285 | x = KEYWORD_STYLE_HASH_PREFIX; | |
2286 | } | |
2287 | opts->keyword_style = x; | |
2288 | ||
2289 | #define RESOLVE_BOOLEAN_OPTION(NAME, name) \ | |
2290 | do \ | |
2291 | { \ | |
2292 | x = READ_OPTION_MASK & (read_options >> READ_OPTION_ ## NAME); \ | |
2293 | if (x == READ_OPTION_INHERIT) \ | |
2294 | x = !!SCM_ ## NAME; \ | |
2295 | opts->name = x; \ | |
2296 | } \ | |
2297 | while (0) | |
2298 | ||
2299 | RESOLVE_BOOLEAN_OPTION (COPY_SOURCE_P, copy_source_p); | |
2300 | RESOLVE_BOOLEAN_OPTION (RECORD_POSITIONS_P, record_positions_p); | |
2301 | RESOLVE_BOOLEAN_OPTION (CASE_INSENSITIVE_P, case_insensitive_p); | |
2302 | RESOLVE_BOOLEAN_OPTION (R6RS_ESCAPES_P, r6rs_escapes_p); | |
2303 | RESOLVE_BOOLEAN_OPTION (SQUARE_BRACKETS_P, square_brackets_p); | |
2304 | RESOLVE_BOOLEAN_OPTION (HUNGRY_EOL_ESCAPES_P, hungry_eol_escapes_p); | |
bf9eb54a | 2305 | RESOLVE_BOOLEAN_OPTION (CURLY_INFIX_P, curly_infix_p); |
ea8c9761 MW |
2306 | |
2307 | #undef RESOLVE_BOOLEAN_OPTION | |
bf9eb54a MW |
2308 | |
2309 | opts->neoteric_p = 0; | |
ea8c9761 MW |
2310 | } |
2311 | ||
0f2d19dd JB |
2312 | void |
2313 | scm_init_read () | |
0f2d19dd | 2314 | { |
d458073b AR |
2315 | SCM read_hash_procs; |
2316 | ||
c81c2ad3 | 2317 | read_hash_procs = scm_make_fluid_with_default (SCM_EOL); |
d458073b AR |
2318 | |
2319 | scm_i_read_hash_procedures = | |
2320 | SCM_VARIABLE_LOC (scm_c_define ("%read-hash-procedures", read_hash_procs)); | |
fed9c9a2 | 2321 | |
62560650 | 2322 | scm_init_opts (scm_read_options, scm_read_opts); |
a0599745 | 2323 | #include "libguile/read.x" |
0f2d19dd | 2324 | } |
89e00824 ML |
2325 | |
2326 | /* | |
2327 | Local Variables: | |
2328 | c-file-style: "gnu" | |
2329 | End: | |
2330 | */ |