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1773bc7d | 1 | /* Copyright (C) 1995,1996,1997,1998,1999,2000,2001,2002,2003,2004,2005,2006,2007,2008,2009,2010,2011,2012,2013 |
dc3e203e AW |
2 | * Free Software Foundation, Inc. |
3 | * | |
4 | * This library is free software; you can redistribute it and/or | |
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. | |
8 | * | |
9 | * This library is distributed in the hope that it will be useful, but | |
10 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | * Lesser General Public License for more details. | |
13 | * | |
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 | |
16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
17 | * 02110-1301 USA | |
18 | */ | |
19 | ||
20 | \f | |
21 | ||
22 | #ifdef HAVE_CONFIG_H | |
23 | # include <config.h> | |
24 | #endif | |
25 | ||
26 | #include "libguile/__scm.h" | |
27 | #include "libguile/_scm.h" | |
28 | #include "libguile/continuations.h" | |
29 | #include "libguile/eq.h" | |
30 | #include "libguile/list.h" | |
31 | #include "libguile/macros.h" | |
32 | #include "libguile/expand.h" | |
33 | #include "libguile/modules.h" | |
34 | #include "libguile/srcprop.h" | |
35 | #include "libguile/ports.h" | |
36 | #include "libguile/print.h" | |
37 | #include "libguile/strings.h" | |
38 | #include "libguile/throw.h" | |
39 | #include "libguile/validate.h" | |
40 | ||
41 | ||
42 | \f | |
43 | ||
44 | ||
45 | SCM scm_exp_vtable_vtable; | |
46 | static SCM exp_vtables[SCM_NUM_EXPANDED_TYPES]; | |
47 | static size_t exp_nfields[SCM_NUM_EXPANDED_TYPES]; | |
48 | static const char* exp_names[SCM_NUM_EXPANDED_TYPES]; | |
49 | static const char** exp_field_names[SCM_NUM_EXPANDED_TYPES]; | |
50 | ||
51 | ||
baeb727b AW |
52 | /* The trailing underscores on these first to are to avoid spurious |
53 | conflicts with macros defined on MinGW. */ | |
54 | ||
55 | #define VOID_(src) \ | |
dc3e203e | 56 | SCM_MAKE_EXPANDED_VOID(src) |
baeb727b | 57 | #define CONST_(src, exp) \ |
dc3e203e | 58 | SCM_MAKE_EXPANDED_CONST(src, exp) |
1773bc7d AW |
59 | #define PRIMITIVE_REF(src, name) \ |
60 | SCM_MAKE_EXPANDED_PRIMITIVE_REF(src, name) | |
dc3e203e AW |
61 | #define LEXICAL_REF(src, name, gensym) \ |
62 | SCM_MAKE_EXPANDED_LEXICAL_REF(src, name, gensym) | |
63 | #define LEXICAL_SET(src, name, gensym, exp) \ | |
64 | SCM_MAKE_EXPANDED_LEXICAL_SET(src, name, gensym, exp) | |
65 | #define MODULE_REF(src, mod, name, public) \ | |
66 | SCM_MAKE_EXPANDED_MODULE_REF(src, mod, name, public) | |
67 | #define MODULE_SET(src, mod, name, public, exp) \ | |
68 | SCM_MAKE_EXPANDED_MODULE_SET(src, mod, name, public, exp) | |
69 | #define TOPLEVEL_REF(src, name) \ | |
70 | SCM_MAKE_EXPANDED_TOPLEVEL_REF(src, name) | |
71 | #define TOPLEVEL_SET(src, name, exp) \ | |
72 | SCM_MAKE_EXPANDED_TOPLEVEL_SET(src, name, exp) | |
73 | #define TOPLEVEL_DEFINE(src, name, exp) \ | |
74 | SCM_MAKE_EXPANDED_TOPLEVEL_DEFINE(src, name, exp) | |
75 | #define CONDITIONAL(src, test, consequent, alternate) \ | |
76 | SCM_MAKE_EXPANDED_CONDITIONAL(src, test, consequent, alternate) | |
1773bc7d AW |
77 | #define PRIMCALL(src, name, exps) \ |
78 | SCM_MAKE_EXPANDED_PRIMCALL(src, name, exps) | |
7081d4f9 AW |
79 | #define CALL(src, proc, exps) \ |
80 | SCM_MAKE_EXPANDED_CALL(src, proc, exps) | |
6fc3eae4 AW |
81 | #define SEQ(src, head, tail) \ |
82 | SCM_MAKE_EXPANDED_SEQ(src, head, tail) | |
dc3e203e AW |
83 | #define LAMBDA(src, meta, body) \ |
84 | SCM_MAKE_EXPANDED_LAMBDA(src, meta, body) | |
85 | #define LAMBDA_CASE(src, req, opt, rest, kw, inits, gensyms, body, alternate) \ | |
86 | SCM_MAKE_EXPANDED_LAMBDA_CASE(src, req, opt, rest, kw, inits, gensyms, body, alternate) | |
87 | #define LET(src, names, gensyms, vals, body) \ | |
88 | SCM_MAKE_EXPANDED_LET(src, names, gensyms, vals, body) | |
fb6e61ca AW |
89 | #define LETREC(src, in_order_p, names, gensyms, vals, body) \ |
90 | SCM_MAKE_EXPANDED_LETREC(src, in_order_p, names, gensyms, vals, body) | |
dc3e203e AW |
91 | |
92 | #define CAR(x) SCM_CAR(x) | |
93 | #define CDR(x) SCM_CDR(x) | |
94 | #define CAAR(x) SCM_CAAR(x) | |
95 | #define CADR(x) SCM_CADR(x) | |
96 | #define CDAR(x) SCM_CDAR(x) | |
97 | #define CDDR(x) SCM_CDDR(x) | |
98 | #define CADDR(x) SCM_CADDR(x) | |
99 | #define CDDDR(x) SCM_CDDDR(x) | |
100 | #define CADDDR(x) SCM_CADDDR(x) | |
101 | ||
102 | ||
103 | static const char s_bad_expression[] = "Bad expression"; | |
104 | static const char s_expression[] = "Missing or extra expression in"; | |
105 | static const char s_missing_expression[] = "Missing expression in"; | |
106 | static const char s_extra_expression[] = "Extra expression in"; | |
107 | static const char s_empty_combination[] = "Illegal empty combination"; | |
108 | static const char s_missing_body_expression[] = "Missing body expression in"; | |
109 | static const char s_mixed_body_forms[] = "Mixed definitions and expressions in"; | |
110 | static const char s_bad_define[] = "Bad define placement"; | |
111 | static const char s_missing_clauses[] = "Missing clauses"; | |
112 | static const char s_misplaced_else_clause[] = "Misplaced else clause"; | |
113 | static const char s_bad_case_clause[] = "Bad case clause"; | |
114 | static const char s_bad_case_labels[] = "Bad case labels"; | |
115 | static const char s_duplicate_case_label[] = "Duplicate case label"; | |
116 | static const char s_bad_cond_clause[] = "Bad cond clause"; | |
117 | static const char s_missing_recipient[] = "Missing recipient in"; | |
118 | static const char s_bad_variable[] = "Bad variable"; | |
119 | static const char s_bad_bindings[] = "Bad bindings"; | |
120 | static const char s_bad_binding[] = "Bad binding"; | |
121 | static const char s_duplicate_binding[] = "Duplicate binding"; | |
122 | static const char s_bad_exit_clause[] = "Bad exit clause"; | |
123 | static const char s_bad_formals[] = "Bad formals"; | |
124 | static const char s_bad_formal[] = "Bad formal"; | |
125 | static const char s_duplicate_formal[] = "Duplicate formal"; | |
126 | static const char s_splicing[] = "Non-list result for unquote-splicing"; | |
127 | static const char s_bad_slot_number[] = "Bad slot number"; | |
128 | ||
129 | static void syntax_error (const char* const, const SCM, const SCM) SCM_NORETURN; | |
130 | ||
131 | SCM_SYMBOL (syntax_error_key, "syntax-error"); | |
132 | ||
133 | /* Shortcut macros to simplify syntax error handling. */ | |
134 | #define ASSERT_SYNTAX(cond, message, form) \ | |
135 | { if (SCM_UNLIKELY (!(cond))) \ | |
136 | syntax_error (message, form, SCM_UNDEFINED); } | |
137 | #define ASSERT_SYNTAX_2(cond, message, form, expr) \ | |
138 | { if (SCM_UNLIKELY (!(cond))) \ | |
139 | syntax_error (message, form, expr); } | |
140 | ||
141 | ||
142 | \f | |
143 | ||
144 | /* Primitive syntax. */ | |
145 | ||
146 | #define SCM_SYNTAX(STR, CFN) \ | |
147 | SCM_SNARF_HERE(static SCM CFN (SCM xorig, SCM env)) \ | |
148 | SCM_SNARF_INIT(scm_c_define (STR, scm_i_make_primitive_macro (STR, CFN))) | |
149 | ||
150 | ||
151 | /* True primitive syntax */ | |
152 | SCM_SYNTAX ("@", expand_at); | |
153 | SCM_SYNTAX ("@@", expand_atat); | |
154 | SCM_SYNTAX ("begin", expand_begin); | |
155 | SCM_SYNTAX ("define", expand_define); | |
dc3e203e AW |
156 | SCM_SYNTAX ("eval-when", expand_eval_when); |
157 | SCM_SYNTAX ("if", expand_if); | |
158 | SCM_SYNTAX ("lambda", expand_lambda); | |
159 | SCM_SYNTAX ("let", expand_let); | |
160 | SCM_SYNTAX ("quote", expand_quote); | |
161 | SCM_SYNTAX ("set!", expand_set_x); | |
162 | ||
163 | /* Convenient syntax during boot, expands to primitive syntax. Replaced after | |
164 | psyntax boots. */ | |
165 | SCM_SYNTAX ("and", expand_and); | |
166 | SCM_SYNTAX ("cond", expand_cond); | |
167 | SCM_SYNTAX ("letrec", expand_letrec); | |
826373a2 | 168 | SCM_SYNTAX ("letrec*", expand_letrec_star); |
dc3e203e AW |
169 | SCM_SYNTAX ("let*", expand_letstar); |
170 | SCM_SYNTAX ("or", expand_or); | |
171 | SCM_SYNTAX ("lambda*", expand_lambda_star); | |
172 | SCM_SYNTAX ("case-lambda", expand_case_lambda); | |
173 | SCM_SYNTAX ("case-lambda*", expand_case_lambda_star); | |
174 | ||
175 | ||
dc3e203e AW |
176 | SCM_GLOBAL_SYMBOL (scm_sym_arrow, "=>"); |
177 | SCM_GLOBAL_SYMBOL (scm_sym_at, "@"); | |
178 | SCM_GLOBAL_SYMBOL (scm_sym_atat, "@@"); | |
dc3e203e AW |
179 | SCM_GLOBAL_SYMBOL (scm_sym_begin, "begin"); |
180 | SCM_GLOBAL_SYMBOL (scm_sym_case, "case"); | |
181 | SCM_GLOBAL_SYMBOL (scm_sym_cond, "cond"); | |
182 | SCM_GLOBAL_SYMBOL (scm_sym_define, "define"); | |
dc3e203e AW |
183 | SCM_GLOBAL_SYMBOL (scm_sym_else, "else"); |
184 | SCM_GLOBAL_SYMBOL (scm_sym_eval_when, "eval-when"); | |
185 | SCM_GLOBAL_SYMBOL (scm_sym_if, "if"); | |
186 | SCM_GLOBAL_SYMBOL (scm_sym_lambda, "lambda"); | |
187 | SCM_GLOBAL_SYMBOL (scm_sym_let, "let"); | |
188 | SCM_GLOBAL_SYMBOL (scm_sym_letrec, "letrec"); | |
189 | SCM_GLOBAL_SYMBOL (scm_sym_letstar, "let*"); | |
190 | SCM_GLOBAL_SYMBOL (scm_sym_or, "or"); | |
1773bc7d | 191 | SCM_SYMBOL (sym_call_with_prompt, "call-with-prompt"); |
dc3e203e AW |
192 | SCM_GLOBAL_SYMBOL (scm_sym_quote, "quote"); |
193 | SCM_GLOBAL_SYMBOL (scm_sym_set_x, "set!"); | |
194 | SCM_SYMBOL (sym_lambda_star, "lambda*"); | |
195 | SCM_SYMBOL (sym_eval, "eval"); | |
196 | SCM_SYMBOL (sym_load, "load"); | |
1773bc7d | 197 | SCM_SYMBOL (sym_primitive, "primitive"); |
dc3e203e AW |
198 | |
199 | SCM_GLOBAL_SYMBOL (scm_sym_unquote, "unquote"); | |
200 | SCM_GLOBAL_SYMBOL (scm_sym_quasiquote, "quasiquote"); | |
201 | SCM_GLOBAL_SYMBOL (scm_sym_uq_splicing, "unquote-splicing"); | |
202 | ||
203 | SCM_KEYWORD (kw_allow_other_keys, "allow-other-keys"); | |
204 | SCM_KEYWORD (kw_optional, "optional"); | |
205 | SCM_KEYWORD (kw_key, "key"); | |
206 | SCM_KEYWORD (kw_rest, "rest"); | |
207 | ||
208 | ||
209 | \f | |
210 | ||
211 | ||
212 | /* Signal a syntax error. We distinguish between the form that caused the | |
213 | * error and the enclosing expression. The error message will print out as | |
214 | * shown in the following pattern. The file name and line number are only | |
215 | * given when they can be determined from the erroneous form or from the | |
216 | * enclosing expression. | |
217 | * | |
218 | * <filename>: In procedure memoization: | |
219 | * <filename>: In file <name>, line <nr>: <error-message> in <expression>. */ | |
220 | ||
221 | static void | |
222 | syntax_error (const char* const msg, const SCM form, const SCM expr) | |
223 | { | |
224 | SCM msg_string = scm_from_locale_string (msg); | |
225 | SCM filename = SCM_BOOL_F; | |
226 | SCM linenr = SCM_BOOL_F; | |
227 | const char *format; | |
228 | SCM args; | |
229 | ||
230 | if (scm_is_pair (form)) | |
231 | { | |
232 | filename = scm_source_property (form, scm_sym_filename); | |
233 | linenr = scm_source_property (form, scm_sym_line); | |
234 | } | |
235 | ||
236 | if (scm_is_false (filename) && scm_is_false (linenr) && scm_is_pair (expr)) | |
237 | { | |
238 | filename = scm_source_property (expr, scm_sym_filename); | |
239 | linenr = scm_source_property (expr, scm_sym_line); | |
240 | } | |
241 | ||
242 | if (!SCM_UNBNDP (expr)) | |
243 | { | |
244 | if (scm_is_true (filename)) | |
245 | { | |
246 | format = "In file ~S, line ~S: ~A ~S in expression ~S."; | |
247 | args = scm_list_5 (filename, linenr, msg_string, form, expr); | |
248 | } | |
249 | else if (scm_is_true (linenr)) | |
250 | { | |
251 | format = "In line ~S: ~A ~S in expression ~S."; | |
252 | args = scm_list_4 (linenr, msg_string, form, expr); | |
253 | } | |
254 | else | |
255 | { | |
256 | format = "~A ~S in expression ~S."; | |
257 | args = scm_list_3 (msg_string, form, expr); | |
258 | } | |
259 | } | |
260 | else | |
261 | { | |
262 | if (scm_is_true (filename)) | |
263 | { | |
264 | format = "In file ~S, line ~S: ~A ~S."; | |
265 | args = scm_list_4 (filename, linenr, msg_string, form); | |
266 | } | |
267 | else if (scm_is_true (linenr)) | |
268 | { | |
269 | format = "In line ~S: ~A ~S."; | |
270 | args = scm_list_3 (linenr, msg_string, form); | |
271 | } | |
272 | else | |
273 | { | |
274 | format = "~A ~S."; | |
275 | args = scm_list_2 (msg_string, form); | |
276 | } | |
277 | } | |
278 | ||
279 | scm_error (syntax_error_key, "memoization", format, args, SCM_BOOL_F); | |
280 | } | |
281 | ||
282 | ||
283 | \f | |
284 | ||
285 | ||
286 | static int | |
287 | expand_env_var_is_free (SCM env, SCM x) | |
288 | { | |
289 | for (; scm_is_pair (env); env = CDR (env)) | |
290 | if (scm_is_eq (x, CAAR (env))) | |
291 | return 0; /* bound */ | |
292 | return 1; /* free */ | |
293 | } | |
294 | ||
295 | static SCM | |
296 | expand_env_ref_macro (SCM env, SCM x) | |
297 | { | |
298 | SCM var; | |
299 | if (!expand_env_var_is_free (env, x)) | |
300 | return SCM_BOOL_F; /* lexical */ | |
301 | ||
302 | var = scm_module_variable (scm_current_module (), x); | |
303 | if (scm_is_true (var) && scm_is_true (scm_variable_bound_p (var)) | |
304 | && scm_is_true (scm_macro_p (scm_variable_ref (var)))) | |
305 | return scm_variable_ref (var); | |
306 | else | |
307 | return SCM_BOOL_F; /* anything else */ | |
308 | } | |
309 | ||
310 | static SCM | |
311 | expand_env_lexical_gensym (SCM env, SCM name) | |
312 | { | |
313 | for (; scm_is_pair (env); env = CDR (env)) | |
314 | if (scm_is_eq (name, CAAR (env))) | |
315 | return CDAR (env); /* bound */ | |
316 | return SCM_BOOL_F; /* free */ | |
317 | } | |
318 | ||
319 | static SCM | |
320 | expand_env_extend (SCM env, SCM names, SCM vars) | |
321 | { | |
322 | while (scm_is_pair (names)) | |
323 | { | |
324 | env = scm_acons (CAR (names), CAR (vars), env); | |
325 | names = CDR (names); | |
326 | vars = CDR (vars); | |
327 | } | |
328 | return env; | |
329 | } | |
330 | ||
331 | static SCM | |
332 | expand (SCM exp, SCM env) | |
333 | { | |
334 | if (scm_is_pair (exp)) | |
335 | { | |
336 | SCM car; | |
337 | scm_t_macro_primitive trans = NULL; | |
338 | SCM macro = SCM_BOOL_F; | |
339 | ||
340 | car = CAR (exp); | |
341 | if (scm_is_symbol (car)) | |
342 | macro = expand_env_ref_macro (env, car); | |
343 | ||
344 | if (scm_is_true (macro)) | |
345 | trans = scm_i_macro_primitive (macro); | |
346 | ||
347 | if (trans) | |
348 | return trans (exp, env); | |
349 | else | |
350 | { | |
351 | SCM arg_exps = SCM_EOL; | |
352 | SCM args = SCM_EOL; | |
1773bc7d | 353 | SCM proc = expand (CAR (exp), env); |
dc3e203e AW |
354 | |
355 | for (arg_exps = CDR (exp); scm_is_pair (arg_exps); | |
356 | arg_exps = CDR (arg_exps)) | |
357 | args = scm_cons (expand (CAR (arg_exps), env), args); | |
1773bc7d AW |
358 | args = scm_reverse_x (args, SCM_UNDEFINED); |
359 | ||
360 | if (!scm_is_null (arg_exps)) | |
dc3e203e | 361 | syntax_error ("expected a proper list", exp, SCM_UNDEFINED); |
1773bc7d AW |
362 | |
363 | if (SCM_EXPANDED_TYPE (proc) == SCM_EXPANDED_PRIMITIVE_REF) | |
364 | return PRIMCALL (scm_source_properties (exp), | |
365 | SCM_EXPANDED_REF (proc, PRIMITIVE_REF, NAME), | |
366 | args); | |
367 | else | |
368 | return CALL (scm_source_properties (exp), proc, args); | |
dc3e203e AW |
369 | } |
370 | } | |
371 | else if (scm_is_symbol (exp)) | |
372 | { | |
373 | SCM gensym = expand_env_lexical_gensym (env, exp); | |
374 | if (scm_is_true (gensym)) | |
375 | return LEXICAL_REF (SCM_BOOL_F, exp, gensym); | |
376 | else | |
377 | return TOPLEVEL_REF (SCM_BOOL_F, exp); | |
378 | } | |
379 | else | |
baeb727b | 380 | return CONST_ (SCM_BOOL_F, exp); |
dc3e203e AW |
381 | } |
382 | ||
383 | static SCM | |
384 | expand_exprs (SCM forms, const SCM env) | |
385 | { | |
386 | SCM ret = SCM_EOL; | |
387 | ||
388 | for (; !scm_is_null (forms); forms = CDR (forms)) | |
389 | ret = scm_cons (expand (CAR (forms), env), ret); | |
390 | return scm_reverse_x (ret, SCM_UNDEFINED); | |
391 | } | |
392 | ||
393 | static SCM | |
394 | expand_sequence (const SCM forms, const SCM env) | |
395 | { | |
396 | ASSERT_SYNTAX (scm_ilength (forms) >= 1, s_bad_expression, | |
397 | scm_cons (scm_sym_begin, forms)); | |
398 | if (scm_is_null (CDR (forms))) | |
399 | return expand (CAR (forms), env); | |
400 | else | |
6fc3eae4 AW |
401 | return SEQ (scm_source_properties (forms), |
402 | expand (CAR (forms), env), | |
403 | expand_sequence (CDR (forms), env)); | |
dc3e203e AW |
404 | } |
405 | ||
406 | ||
407 | \f | |
408 | ||
409 | ||
410 | static SCM | |
411 | expand_at (SCM expr, SCM env SCM_UNUSED) | |
412 | { | |
413 | ASSERT_SYNTAX (scm_ilength (expr) == 3, s_bad_expression, expr); | |
414 | ASSERT_SYNTAX (scm_ilength (CADR (expr)) > 0, s_bad_expression, expr); | |
415 | ASSERT_SYNTAX (scm_is_symbol (CADDR (expr)), s_bad_expression, expr); | |
416 | ||
417 | return MODULE_REF (scm_source_properties (expr), | |
418 | CADR (expr), CADDR (expr), SCM_BOOL_T); | |
419 | } | |
420 | ||
421 | static SCM | |
422 | expand_atat (SCM expr, SCM env SCM_UNUSED) | |
423 | { | |
424 | ASSERT_SYNTAX (scm_ilength (expr) == 3, s_bad_expression, expr); | |
dc3e203e AW |
425 | ASSERT_SYNTAX (scm_is_symbol (CADDR (expr)), s_bad_expression, expr); |
426 | ||
1773bc7d AW |
427 | if (scm_is_eq (CADR (expr), sym_primitive)) |
428 | return PRIMITIVE_REF (scm_source_properties (expr), CADDR (expr)); | |
429 | ||
430 | ASSERT_SYNTAX (scm_ilength (CADR (expr)) > 0, s_bad_expression, expr); | |
dc3e203e AW |
431 | return MODULE_REF (scm_source_properties (expr), |
432 | CADR (expr), CADDR (expr), SCM_BOOL_F); | |
433 | } | |
434 | ||
435 | static SCM | |
436 | expand_and (SCM expr, SCM env) | |
437 | { | |
438 | const SCM cdr_expr = CDR (expr); | |
439 | ||
440 | if (scm_is_null (cdr_expr)) | |
baeb727b | 441 | return CONST_ (SCM_BOOL_F, SCM_BOOL_T); |
dc3e203e AW |
442 | |
443 | ASSERT_SYNTAX (scm_is_pair (cdr_expr), s_bad_expression, expr); | |
444 | ||
445 | if (scm_is_null (CDR (cdr_expr))) | |
446 | return expand (CAR (cdr_expr), env); | |
447 | else | |
448 | return CONDITIONAL (scm_source_properties (expr), | |
449 | expand (CAR (cdr_expr), env), | |
450 | expand_and (cdr_expr, env), | |
baeb727b | 451 | CONST_ (SCM_BOOL_F, SCM_BOOL_F)); |
dc3e203e AW |
452 | } |
453 | ||
454 | static SCM | |
455 | expand_begin (SCM expr, SCM env) | |
456 | { | |
457 | const SCM cdr_expr = CDR (expr); | |
458 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 1, s_bad_expression, expr); | |
459 | return expand_sequence (cdr_expr, env); | |
460 | } | |
461 | ||
462 | static SCM | |
463 | expand_cond_clauses (SCM clause, SCM rest, int elp, int alp, SCM env) | |
464 | { | |
465 | SCM test; | |
466 | const long length = scm_ilength (clause); | |
467 | ASSERT_SYNTAX (length >= 1, s_bad_cond_clause, clause); | |
468 | ||
469 | test = CAR (clause); | |
470 | if (scm_is_eq (test, scm_sym_else) && elp) | |
471 | { | |
472 | const int last_clause_p = scm_is_null (rest); | |
473 | ASSERT_SYNTAX (length >= 2, s_bad_cond_clause, clause); | |
474 | ASSERT_SYNTAX (last_clause_p, s_misplaced_else_clause, clause); | |
475 | return expand_sequence (CDR (clause), env); | |
476 | } | |
477 | ||
478 | if (scm_is_null (rest)) | |
baeb727b | 479 | rest = VOID_ (SCM_BOOL_F); |
dc3e203e AW |
480 | else |
481 | rest = expand_cond_clauses (CAR (rest), CDR (rest), elp, alp, env); | |
482 | ||
483 | if (length >= 2 | |
484 | && scm_is_eq (CADR (clause), scm_sym_arrow) | |
485 | && alp) | |
486 | { | |
487 | SCM tmp = scm_gensym (scm_from_locale_string ("cond ")); | |
488 | SCM new_env = scm_acons (tmp, tmp, env); | |
489 | ASSERT_SYNTAX (length > 2, s_missing_recipient, clause); | |
490 | ASSERT_SYNTAX (length == 3, s_extra_expression, clause); | |
491 | return LET (SCM_BOOL_F, | |
492 | scm_list_1 (tmp), | |
493 | scm_list_1 (tmp), | |
494 | scm_list_1 (expand (test, env)), | |
495 | CONDITIONAL (SCM_BOOL_F, | |
496 | LEXICAL_REF (SCM_BOOL_F, tmp, tmp), | |
7081d4f9 AW |
497 | CALL (SCM_BOOL_F, |
498 | expand (CADDR (clause), new_env), | |
499 | scm_list_1 (LEXICAL_REF (SCM_BOOL_F, | |
500 | tmp, tmp))), | |
dc3e203e AW |
501 | rest)); |
502 | } | |
503 | /* FIXME length == 1 case */ | |
504 | else | |
505 | return CONDITIONAL (SCM_BOOL_F, | |
506 | expand (test, env), | |
507 | expand_sequence (CDR (clause), env), | |
508 | rest); | |
509 | } | |
510 | ||
511 | static SCM | |
512 | expand_cond (SCM expr, SCM env) | |
513 | { | |
514 | const int else_literal_p = expand_env_var_is_free (env, scm_sym_else); | |
515 | const int arrow_literal_p = expand_env_var_is_free (env, scm_sym_arrow); | |
516 | const SCM clauses = CDR (expr); | |
517 | ||
518 | ASSERT_SYNTAX (scm_ilength (clauses) >= 0, s_bad_expression, expr); | |
519 | ASSERT_SYNTAX (scm_ilength (clauses) >= 1, s_missing_clauses, expr); | |
520 | ||
521 | return expand_cond_clauses (CAR (clauses), CDR (clauses), | |
522 | else_literal_p, arrow_literal_p, env); | |
523 | } | |
524 | ||
525 | /* lone forward decl */ | |
526 | static SCM expand_lambda (SCM expr, SCM env); | |
527 | ||
528 | /* According to Section 5.2.1 of R5RS we first have to make sure that the | |
529 | variable is bound, and then perform the `(set! variable expression)' | |
530 | operation. However, EXPRESSION _can_ be evaluated before VARIABLE is | |
531 | bound. This means that EXPRESSION won't necessarily be able to assign | |
532 | values to VARIABLE as in `(define foo (begin (set! foo 1) (+ foo 1)))'. */ | |
533 | static SCM | |
534 | expand_define (SCM expr, SCM env) | |
535 | { | |
536 | const SCM cdr_expr = CDR (expr); | |
537 | SCM body; | |
538 | SCM variable; | |
539 | ||
540 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
541 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr); | |
542 | ASSERT_SYNTAX (!scm_is_pair (env), s_bad_define, expr); | |
543 | ||
544 | body = CDR (cdr_expr); | |
545 | variable = CAR (cdr_expr); | |
546 | ||
547 | if (scm_is_pair (variable)) | |
548 | { | |
549 | ASSERT_SYNTAX_2 (scm_is_symbol (CAR (variable)), s_bad_variable, variable, expr); | |
550 | return TOPLEVEL_DEFINE | |
551 | (scm_source_properties (expr), | |
552 | CAR (variable), | |
553 | expand_lambda (scm_cons (scm_sym_lambda, scm_cons (CDR (variable), body)), | |
554 | env)); | |
555 | } | |
556 | ASSERT_SYNTAX_2 (scm_is_symbol (variable), s_bad_variable, variable, expr); | |
557 | ASSERT_SYNTAX (scm_ilength (body) == 1, s_expression, expr); | |
558 | return TOPLEVEL_DEFINE (scm_source_properties (expr), variable, | |
559 | expand (CAR (body), env)); | |
560 | } | |
561 | ||
dc3e203e AW |
562 | static SCM |
563 | expand_eval_when (SCM expr, SCM env) | |
564 | { | |
565 | ASSERT_SYNTAX (scm_ilength (expr) >= 3, s_bad_expression, expr); | |
566 | ASSERT_SYNTAX (scm_ilength (CADR (expr)) > 0, s_bad_expression, expr); | |
567 | ||
568 | if (scm_is_true (scm_memq (sym_eval, CADR (expr))) | |
569 | || scm_is_true (scm_memq (sym_load, CADR (expr)))) | |
570 | return expand_sequence (CDDR (expr), env); | |
571 | else | |
baeb727b | 572 | return VOID_ (scm_source_properties (expr)); |
dc3e203e AW |
573 | } |
574 | ||
575 | static SCM | |
576 | expand_if (SCM expr, SCM env SCM_UNUSED) | |
577 | { | |
578 | const SCM cdr_expr = CDR (expr); | |
579 | const long length = scm_ilength (cdr_expr); | |
580 | ASSERT_SYNTAX (length == 2 || length == 3, s_expression, expr); | |
581 | return CONDITIONAL (scm_source_properties (expr), | |
582 | expand (CADR (expr), env), | |
583 | expand (CADDR (expr), env), | |
584 | ((length == 3) | |
585 | ? expand (CADDDR (expr), env) | |
baeb727b | 586 | : VOID_ (SCM_BOOL_F))); |
dc3e203e AW |
587 | } |
588 | ||
589 | /* A helper function for expand_lambda to support checking for duplicate | |
590 | * formal arguments: Return true if OBJ is `eq?' to one of the elements of | |
591 | * LIST or to the CDR of the last cons. Therefore, LIST may have any of the | |
592 | * forms that a formal argument can have: | |
593 | * <rest>, (<arg1> ...), (<arg1> ... . <rest>) */ | |
594 | static int | |
595 | c_improper_memq (SCM obj, SCM list) | |
596 | { | |
597 | for (; scm_is_pair (list); list = CDR (list)) | |
598 | { | |
599 | if (scm_is_eq (CAR (list), obj)) | |
600 | return 1; | |
601 | } | |
602 | return scm_is_eq (list, obj); | |
603 | } | |
604 | ||
605 | static SCM | |
606 | expand_lambda_case (SCM clause, SCM alternate, SCM env) | |
607 | { | |
608 | SCM formals; | |
609 | SCM rest; | |
610 | SCM req = SCM_EOL; | |
611 | SCM vars = SCM_EOL; | |
612 | SCM body; | |
613 | int nreq = 0; | |
614 | ||
615 | ASSERT_SYNTAX (scm_is_pair (clause) && scm_is_pair (CDR (clause)), | |
616 | s_bad_expression, scm_cons (scm_sym_lambda, clause)); | |
617 | ||
618 | /* Before iterating the list of formal arguments, make sure the formals | |
619 | * actually are given as either a symbol or a non-cyclic list. */ | |
620 | formals = CAR (clause); | |
621 | if (scm_is_pair (formals)) | |
622 | { | |
623 | /* Dirk:FIXME:: We should check for a cyclic list of formals, and if | |
624 | * detected, report a 'Bad formals' error. */ | |
625 | } | |
626 | else | |
627 | ASSERT_SYNTAX_2 (scm_is_symbol (formals) || scm_is_null (formals), | |
628 | s_bad_formals, formals, scm_cons (scm_sym_lambda, clause)); | |
629 | ||
630 | /* Now iterate the list of formal arguments to check if all formals are | |
631 | * symbols, and that there are no duplicates. */ | |
632 | while (scm_is_pair (formals)) | |
633 | { | |
634 | const SCM formal = CAR (formals); | |
635 | formals = CDR (formals); | |
636 | ASSERT_SYNTAX_2 (scm_is_symbol (formal), s_bad_formal, formal, | |
637 | scm_cons (scm_sym_lambda, clause)); | |
638 | ASSERT_SYNTAX_2 (!c_improper_memq (formal, formals), s_duplicate_formal, | |
639 | formal, scm_cons (scm_sym_lambda, clause)); | |
640 | nreq++; | |
641 | req = scm_cons (formal, req); | |
642 | vars = scm_cons (scm_gensym (SCM_UNDEFINED), vars); | |
643 | env = scm_acons (formal, CAR (vars), env); | |
644 | } | |
645 | ||
646 | ASSERT_SYNTAX_2 (scm_is_null (formals) || scm_is_symbol (formals), | |
647 | s_bad_formal, formals, scm_cons (scm_sym_lambda, clause)); | |
648 | if (scm_is_symbol (formals)) | |
649 | { | |
650 | rest = formals; | |
651 | vars = scm_cons (scm_gensym (SCM_UNDEFINED), vars); | |
652 | env = scm_acons (rest, CAR (vars), env); | |
653 | } | |
654 | else | |
655 | rest = SCM_BOOL_F; | |
656 | ||
657 | body = expand_sequence (CDR (clause), env); | |
658 | req = scm_reverse_x (req, SCM_UNDEFINED); | |
659 | vars = scm_reverse_x (vars, SCM_UNDEFINED); | |
660 | ||
661 | if (scm_is_true (alternate) && !(SCM_EXPANDED_P (alternate) && SCM_EXPANDED_TYPE (alternate) == SCM_EXPANDED_LAMBDA_CASE)) | |
662 | abort (); | |
663 | ||
664 | return LAMBDA_CASE (SCM_BOOL_F, req, SCM_BOOL_F, rest, SCM_BOOL_F, | |
665 | SCM_EOL, vars, body, alternate); | |
666 | } | |
667 | ||
668 | static SCM | |
669 | expand_lambda (SCM expr, SCM env) | |
670 | { | |
671 | return LAMBDA (scm_source_properties (expr), | |
672 | SCM_EOL, | |
673 | expand_lambda_case (CDR (expr), SCM_BOOL_F, env)); | |
674 | } | |
675 | ||
676 | static SCM | |
677 | expand_lambda_star_case (SCM clause, SCM alternate, SCM env) | |
678 | { | |
679 | SCM req, opt, kw, allow_other_keys, rest, formals, vars, body, tmp; | |
632ddbf0 | 680 | SCM inits; |
dc3e203e AW |
681 | int nreq, nopt; |
682 | ||
683 | const long length = scm_ilength (clause); | |
684 | ASSERT_SYNTAX (length >= 1, s_bad_expression, | |
685 | scm_cons (sym_lambda_star, clause)); | |
686 | ASSERT_SYNTAX (length >= 2, s_missing_expression, | |
687 | scm_cons (sym_lambda_star, clause)); | |
688 | ||
689 | formals = CAR (clause); | |
690 | body = CDR (clause); | |
691 | ||
692 | nreq = nopt = 0; | |
693 | req = opt = kw = SCM_EOL; | |
694 | rest = allow_other_keys = SCM_BOOL_F; | |
695 | ||
696 | while (scm_is_pair (formals) && scm_is_symbol (CAR (formals))) | |
697 | { | |
698 | nreq++; | |
699 | req = scm_cons (CAR (formals), req); | |
700 | formals = scm_cdr (formals); | |
701 | } | |
702 | ||
703 | if (scm_is_pair (formals) && scm_is_eq (CAR (formals), kw_optional)) | |
704 | { | |
705 | formals = CDR (formals); | |
706 | while (scm_is_pair (formals) | |
707 | && (scm_is_symbol (CAR (formals)) || scm_is_pair (CAR (formals)))) | |
708 | { | |
709 | nopt++; | |
710 | opt = scm_cons (CAR (formals), opt); | |
711 | formals = scm_cdr (formals); | |
712 | } | |
713 | } | |
714 | ||
715 | if (scm_is_pair (formals) && scm_is_eq (CAR (formals), kw_key)) | |
716 | { | |
717 | formals = CDR (formals); | |
718 | while (scm_is_pair (formals) | |
719 | && (scm_is_symbol (CAR (formals)) || scm_is_pair (CAR (formals)))) | |
720 | { | |
721 | kw = scm_cons (CAR (formals), kw); | |
722 | formals = scm_cdr (formals); | |
723 | } | |
724 | } | |
725 | ||
726 | if (scm_is_pair (formals) && scm_is_eq (CAR (formals), kw_allow_other_keys)) | |
727 | { | |
728 | formals = CDR (formals); | |
729 | allow_other_keys = SCM_BOOL_T; | |
730 | } | |
731 | ||
732 | if (scm_is_pair (formals) && scm_is_eq (CAR (formals), kw_rest)) | |
733 | { | |
734 | ASSERT_SYNTAX (scm_ilength (formals) == 2, s_bad_formals, | |
735 | CAR (clause)); | |
736 | rest = CADR (formals); | |
737 | } | |
738 | else if (scm_is_symbol (formals)) | |
739 | rest = formals; | |
740 | else | |
741 | { | |
742 | ASSERT_SYNTAX (scm_is_null (formals), s_bad_formals, CAR (clause)); | |
743 | rest = SCM_BOOL_F; | |
744 | } | |
745 | ||
746 | /* Now, iterate through them a second time, building up an expansion-time | |
747 | environment, checking, expanding and canonicalizing the opt/kw init forms, | |
748 | and eventually memoizing the body as well. Note that the rest argument, if | |
749 | any, is expanded before keyword args, thus necessitating the second | |
750 | pass. | |
751 | ||
752 | Also note that the specific environment during expansion of init | |
753 | expressions here needs to coincide with the environment when psyntax | |
754 | expands. A lot of effort for something that is only used in the bootstrap | |
755 | expandr, you say? Yes. Yes it is. | |
756 | */ | |
757 | ||
758 | vars = SCM_EOL; | |
759 | req = scm_reverse_x (req, SCM_EOL); | |
760 | for (tmp = req; scm_is_pair (tmp); tmp = scm_cdr (tmp)) | |
761 | { | |
762 | vars = scm_cons (scm_gensym (SCM_UNDEFINED), vars); | |
763 | env = scm_acons (CAR (tmp), CAR (vars), env); | |
764 | } | |
765 | ||
766 | /* Build up opt inits and env */ | |
767 | inits = SCM_EOL; | |
768 | opt = scm_reverse_x (opt, SCM_EOL); | |
769 | for (tmp = opt; scm_is_pair (tmp); tmp = scm_cdr (tmp)) | |
770 | { | |
771 | SCM x = CAR (tmp); | |
772 | vars = scm_cons (scm_gensym (SCM_UNDEFINED), vars); | |
773 | env = scm_acons (x, CAR (vars), env); | |
774 | if (scm_is_symbol (x)) | |
baeb727b | 775 | inits = scm_cons (CONST_ (SCM_BOOL_F, SCM_BOOL_F), inits); |
dc3e203e AW |
776 | else |
777 | { | |
778 | ASSERT_SYNTAX (scm_ilength (x) == 2 && scm_is_symbol (CAR (x)), | |
779 | s_bad_formals, CAR (clause)); | |
780 | inits = scm_cons (expand (CADR (x), env), inits); | |
781 | } | |
782 | env = scm_acons (scm_is_symbol (x) ? x : CAR (x), CAR (vars), env); | |
783 | } | |
784 | if (scm_is_null (opt)) | |
785 | opt = SCM_BOOL_F; | |
786 | ||
787 | /* Process rest before keyword args */ | |
788 | if (scm_is_true (rest)) | |
789 | { | |
790 | vars = scm_cons (scm_gensym (SCM_UNDEFINED), vars); | |
791 | env = scm_acons (rest, CAR (vars), env); | |
792 | } | |
793 | ||
632ddbf0 | 794 | /* Build up kw inits, env, and kw-canon list */ |
dc3e203e AW |
795 | if (scm_is_null (kw)) |
796 | kw = SCM_BOOL_F; | |
797 | else | |
798 | { | |
632ddbf0 | 799 | SCM kw_canon = SCM_EOL; |
dc3e203e AW |
800 | kw = scm_reverse_x (kw, SCM_UNDEFINED); |
801 | for (tmp = kw; scm_is_pair (tmp); tmp = scm_cdr (tmp)) | |
802 | { | |
803 | SCM x, sym, k, init; | |
804 | x = CAR (tmp); | |
805 | if (scm_is_symbol (x)) | |
806 | { | |
807 | sym = x; | |
808 | init = SCM_BOOL_F; | |
809 | k = scm_symbol_to_keyword (sym); | |
810 | } | |
811 | else if (scm_ilength (x) == 2 && scm_is_symbol (CAR (x))) | |
812 | { | |
813 | sym = CAR (x); | |
814 | init = CADR (x); | |
815 | k = scm_symbol_to_keyword (sym); | |
816 | } | |
817 | else if (scm_ilength (x) == 3 && scm_is_symbol (CAR (x)) | |
818 | && scm_is_keyword (CADDR (x))) | |
819 | { | |
820 | sym = CAR (x); | |
821 | init = CADR (x); | |
822 | k = CADDR (x); | |
823 | } | |
824 | else | |
825 | syntax_error (s_bad_formals, CAR (clause), SCM_UNDEFINED); | |
826 | ||
dc3e203e AW |
827 | inits = scm_cons (expand (init, env), inits); |
828 | vars = scm_cons (scm_gensym (SCM_UNDEFINED), vars); | |
632ddbf0 | 829 | kw_canon = scm_cons (scm_list_3 (k, sym, CAR (vars)), kw_canon); |
dc3e203e AW |
830 | env = scm_acons (sym, CAR (vars), env); |
831 | } | |
632ddbf0 AW |
832 | kw_canon = scm_reverse_x (kw_canon, SCM_UNDEFINED); |
833 | kw = scm_cons (allow_other_keys, kw_canon); | |
dc3e203e AW |
834 | } |
835 | ||
836 | /* We should check for no duplicates, but given that psyntax does this | |
837 | already, we can punt on it here... */ | |
838 | ||
839 | vars = scm_reverse_x (vars, SCM_UNDEFINED); | |
840 | inits = scm_reverse_x (inits, SCM_UNDEFINED); | |
841 | body = expand_sequence (body, env); | |
842 | ||
843 | return LAMBDA_CASE (SCM_BOOL_F, req, opt, rest, kw, inits, vars, body, | |
844 | alternate); | |
845 | } | |
846 | ||
847 | static SCM | |
848 | expand_lambda_star (SCM expr, SCM env) | |
849 | { | |
850 | return LAMBDA (scm_source_properties (expr), | |
851 | SCM_EOL, | |
852 | expand_lambda_star_case (CDR (expr), SCM_BOOL_F, env)); | |
853 | } | |
854 | ||
855 | static SCM | |
856 | expand_case_lambda_clauses (SCM expr, SCM rest, SCM env) | |
857 | { | |
858 | SCM alt; | |
859 | ||
860 | if (scm_is_pair (rest)) | |
861 | alt = expand_case_lambda_clauses (CAR (rest), CDR (rest), env); | |
862 | else | |
863 | alt = SCM_BOOL_F; | |
864 | ||
865 | return expand_lambda_case (expr, alt, env); | |
866 | } | |
867 | ||
868 | static SCM | |
869 | expand_case_lambda (SCM expr, SCM env) | |
870 | { | |
871 | ASSERT_SYNTAX (scm_is_pair (CDR (expr)), s_missing_expression, expr); | |
872 | ||
873 | return LAMBDA (scm_source_properties (expr), | |
874 | SCM_EOL, | |
875 | expand_case_lambda_clauses (CADR (expr), CDDR (expr), env)); | |
876 | } | |
877 | ||
878 | static SCM | |
879 | expand_case_lambda_star_clauses (SCM expr, SCM rest, SCM env) | |
880 | { | |
881 | SCM alt; | |
882 | ||
883 | if (scm_is_pair (rest)) | |
884 | alt = expand_case_lambda_star_clauses (CAR (rest), CDR (rest), env); | |
885 | else | |
886 | alt = SCM_BOOL_F; | |
887 | ||
888 | return expand_lambda_star_case (expr, alt, env); | |
889 | } | |
890 | ||
891 | static SCM | |
892 | expand_case_lambda_star (SCM expr, SCM env) | |
893 | { | |
894 | ASSERT_SYNTAX (scm_is_pair (CDR (expr)), s_missing_expression, expr); | |
895 | ||
896 | return LAMBDA (scm_source_properties (expr), | |
897 | SCM_EOL, | |
898 | expand_case_lambda_star_clauses (CADR (expr), CDDR (expr), env)); | |
899 | } | |
900 | ||
901 | /* Check if the format of the bindings is ((<symbol> <init-form>) ...). */ | |
902 | static void | |
903 | check_bindings (const SCM bindings, const SCM expr) | |
904 | { | |
905 | SCM binding_idx; | |
906 | ||
907 | ASSERT_SYNTAX_2 (scm_ilength (bindings) >= 0, | |
908 | s_bad_bindings, bindings, expr); | |
909 | ||
910 | binding_idx = bindings; | |
911 | for (; !scm_is_null (binding_idx); binding_idx = CDR (binding_idx)) | |
912 | { | |
913 | SCM name; /* const */ | |
914 | ||
915 | const SCM binding = CAR (binding_idx); | |
916 | ASSERT_SYNTAX_2 (scm_ilength (binding) == 2, | |
917 | s_bad_binding, binding, expr); | |
918 | ||
919 | name = CAR (binding); | |
920 | ASSERT_SYNTAX_2 (scm_is_symbol (name), s_bad_variable, name, expr); | |
921 | } | |
922 | } | |
923 | ||
924 | /* The bindings, which must have the format ((v1 i1) (v2 i2) ... (vn in)), are | |
925 | * transformed to the lists (vn .. v2 v1) and (i1 i2 ... in). If a duplicate | |
926 | * variable name is detected, an error is signalled. */ | |
927 | static void | |
928 | transform_bindings (const SCM bindings, const SCM expr, | |
929 | SCM *const names, SCM *const vars, SCM *const initptr) | |
930 | { | |
931 | SCM rnames = SCM_EOL; | |
932 | SCM rvars = SCM_EOL; | |
933 | SCM rinits = SCM_EOL; | |
934 | SCM binding_idx = bindings; | |
935 | for (; !scm_is_null (binding_idx); binding_idx = CDR (binding_idx)) | |
936 | { | |
937 | const SCM binding = CAR (binding_idx); | |
938 | const SCM CDR_binding = CDR (binding); | |
939 | const SCM name = CAR (binding); | |
940 | ASSERT_SYNTAX_2 (scm_is_false (scm_c_memq (name, rnames)), | |
941 | s_duplicate_binding, name, expr); | |
942 | rnames = scm_cons (name, rnames); | |
943 | rvars = scm_cons (scm_gensym (SCM_UNDEFINED), rvars); | |
944 | rinits = scm_cons (CAR (CDR_binding), rinits); | |
945 | } | |
946 | *names = scm_reverse_x (rnames, SCM_UNDEFINED); | |
947 | *vars = scm_reverse_x (rvars, SCM_UNDEFINED); | |
948 | *initptr = scm_reverse_x (rinits, SCM_UNDEFINED); | |
949 | } | |
950 | ||
951 | /* FIXME: Remove named let in this boot expander. */ | |
952 | static SCM | |
953 | expand_named_let (const SCM expr, SCM env) | |
954 | { | |
955 | SCM var_names, var_syms, inits; | |
956 | SCM inner_env; | |
957 | SCM name_sym; | |
958 | ||
959 | const SCM cdr_expr = CDR (expr); | |
960 | const SCM name = CAR (cdr_expr); | |
961 | const SCM cddr_expr = CDR (cdr_expr); | |
962 | const SCM bindings = CAR (cddr_expr); | |
963 | check_bindings (bindings, expr); | |
964 | ||
965 | transform_bindings (bindings, expr, &var_names, &var_syms, &inits); | |
966 | name_sym = scm_gensym (SCM_UNDEFINED); | |
967 | inner_env = scm_acons (name, name_sym, env); | |
968 | inner_env = expand_env_extend (inner_env, var_names, var_syms); | |
969 | ||
970 | return LETREC | |
fb6e61ca | 971 | (scm_source_properties (expr), SCM_BOOL_F, |
dc3e203e AW |
972 | scm_list_1 (name), scm_list_1 (name_sym), |
973 | scm_list_1 (LAMBDA (SCM_BOOL_F, | |
974 | SCM_EOL, | |
975 | LAMBDA_CASE (SCM_BOOL_F, var_names, SCM_BOOL_F, SCM_BOOL_F, | |
976 | SCM_BOOL_F, SCM_BOOL_F, var_syms, | |
977 | expand_sequence (CDDDR (expr), inner_env), | |
978 | SCM_BOOL_F))), | |
7081d4f9 AW |
979 | CALL (SCM_BOOL_F, |
980 | LEXICAL_REF (SCM_BOOL_F, name, name_sym), | |
981 | expand_exprs (inits, env))); | |
dc3e203e AW |
982 | } |
983 | ||
984 | static SCM | |
985 | expand_let (SCM expr, SCM env) | |
986 | { | |
987 | SCM bindings; | |
988 | ||
989 | const SCM cdr_expr = CDR (expr); | |
990 | const long length = scm_ilength (cdr_expr); | |
991 | ASSERT_SYNTAX (length >= 0, s_bad_expression, expr); | |
992 | ASSERT_SYNTAX (length >= 2, s_missing_expression, expr); | |
993 | ||
994 | bindings = CAR (cdr_expr); | |
995 | if (scm_is_symbol (bindings)) | |
996 | { | |
997 | ASSERT_SYNTAX (length >= 3, s_missing_expression, expr); | |
998 | return expand_named_let (expr, env); | |
999 | } | |
1000 | ||
1001 | check_bindings (bindings, expr); | |
1002 | if (scm_is_null (bindings)) | |
1003 | return expand_sequence (CDDR (expr), env); | |
1004 | else | |
1005 | { | |
1006 | SCM var_names, var_syms, inits; | |
1007 | transform_bindings (bindings, expr, &var_names, &var_syms, &inits); | |
1008 | return LET (SCM_BOOL_F, | |
1009 | var_names, var_syms, expand_exprs (inits, env), | |
1010 | expand_sequence (CDDR (expr), | |
1011 | expand_env_extend (env, var_names, | |
1012 | var_syms))); | |
1013 | } | |
1014 | } | |
1015 | ||
1016 | static SCM | |
826373a2 | 1017 | expand_letrec_helper (SCM expr, SCM env, SCM in_order_p) |
dc3e203e AW |
1018 | { |
1019 | SCM bindings; | |
1020 | ||
1021 | const SCM cdr_expr = CDR (expr); | |
1022 | const long length = scm_ilength (cdr_expr); | |
1023 | ASSERT_SYNTAX (length >= 0, s_bad_expression, expr); | |
1024 | ASSERT_SYNTAX (length >= 2, s_missing_expression, expr); | |
1025 | ||
1026 | bindings = CAR (cdr_expr); | |
1027 | check_bindings (bindings, expr); | |
1028 | if (scm_is_null (bindings)) | |
1029 | return expand_sequence (CDDR (expr), env); | |
1030 | else | |
1031 | { | |
1032 | SCM var_names, var_syms, inits; | |
1033 | transform_bindings (bindings, expr, &var_names, &var_syms, &inits); | |
1034 | env = expand_env_extend (env, var_names, var_syms); | |
826373a2 | 1035 | return LETREC (SCM_BOOL_F, in_order_p, |
dc3e203e AW |
1036 | var_names, var_syms, expand_exprs (inits, env), |
1037 | expand_sequence (CDDR (expr), env)); | |
1038 | } | |
1039 | } | |
1040 | ||
826373a2 AW |
1041 | static SCM |
1042 | expand_letrec (SCM expr, SCM env) | |
1043 | { | |
1044 | return expand_letrec_helper (expr, env, SCM_BOOL_F); | |
1045 | } | |
1046 | ||
1047 | static SCM | |
1048 | expand_letrec_star (SCM expr, SCM env) | |
1049 | { | |
1050 | return expand_letrec_helper (expr, env, SCM_BOOL_T); | |
1051 | } | |
1052 | ||
dc3e203e AW |
1053 | static SCM |
1054 | expand_letstar_clause (SCM bindings, SCM body, SCM env SCM_UNUSED) | |
1055 | { | |
1056 | if (scm_is_null (bindings)) | |
1057 | return expand_sequence (body, env); | |
1058 | else | |
1059 | { | |
1060 | SCM bind, name, sym, init; | |
1061 | ||
1062 | ASSERT_SYNTAX (scm_is_pair (bindings), s_bad_expression, bindings); | |
1063 | bind = CAR (bindings); | |
1064 | ASSERT_SYNTAX (scm_ilength (bind) == 2, s_bad_binding, bind); | |
1065 | name = CAR (bind); | |
1066 | sym = scm_gensym (SCM_UNDEFINED); | |
1067 | init = CADR (bind); | |
1068 | ||
1069 | return LET (SCM_BOOL_F, scm_list_1 (name), scm_list_1 (sym), | |
1070 | scm_list_1 (expand (init, env)), | |
1071 | expand_letstar_clause (CDR (bindings), body, | |
1072 | scm_acons (name, sym, env))); | |
1073 | } | |
1074 | } | |
1075 | ||
1076 | static SCM | |
1077 | expand_letstar (SCM expr, SCM env SCM_UNUSED) | |
1078 | { | |
1079 | const SCM cdr_expr = CDR (expr); | |
1080 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1081 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr); | |
1082 | ||
1083 | return expand_letstar_clause (CADR (expr), CDDR (expr), env); | |
1084 | } | |
1085 | ||
1086 | static SCM | |
1087 | expand_or (SCM expr, SCM env SCM_UNUSED) | |
1088 | { | |
1089 | SCM tail = CDR (expr); | |
1090 | const long length = scm_ilength (tail); | |
1091 | ||
1092 | ASSERT_SYNTAX (length >= 0, s_bad_expression, expr); | |
1093 | ||
1094 | if (scm_is_null (CDR (expr))) | |
baeb727b | 1095 | return CONST_ (SCM_BOOL_F, SCM_BOOL_F); |
dc3e203e AW |
1096 | else |
1097 | { | |
1098 | SCM tmp = scm_gensym (SCM_UNDEFINED); | |
1099 | return LET (SCM_BOOL_F, | |
1100 | scm_list_1 (tmp), scm_list_1 (tmp), | |
1101 | scm_list_1 (expand (CADR (expr), env)), | |
1102 | CONDITIONAL (SCM_BOOL_F, | |
1103 | LEXICAL_REF (SCM_BOOL_F, tmp, tmp), | |
1104 | LEXICAL_REF (SCM_BOOL_F, tmp, tmp), | |
1105 | expand_or (CDR (expr), | |
1106 | scm_acons (tmp, tmp, env)))); | |
1107 | } | |
1108 | } | |
1109 | ||
1110 | static SCM | |
1111 | expand_quote (SCM expr, SCM env SCM_UNUSED) | |
1112 | { | |
1113 | SCM quotee; | |
1114 | ||
1115 | const SCM cdr_expr = CDR (expr); | |
1116 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1117 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 1, s_expression, expr); | |
1118 | quotee = CAR (cdr_expr); | |
baeb727b | 1119 | return CONST_ (scm_source_properties (expr), quotee); |
dc3e203e AW |
1120 | } |
1121 | ||
1122 | static SCM | |
1123 | expand_set_x (SCM expr, SCM env) | |
1124 | { | |
1125 | SCM variable; | |
1126 | SCM vmem; | |
1127 | ||
1128 | const SCM cdr_expr = CDR (expr); | |
1129 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1130 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_expression, expr); | |
1131 | variable = CAR (cdr_expr); | |
1132 | vmem = expand (variable, env); | |
1133 | ||
1134 | switch (SCM_EXPANDED_TYPE (vmem)) | |
1135 | { | |
1136 | case SCM_EXPANDED_LEXICAL_REF: | |
1137 | return LEXICAL_SET (scm_source_properties (expr), | |
1138 | SCM_EXPANDED_REF (vmem, LEXICAL_REF, NAME), | |
1139 | SCM_EXPANDED_REF (vmem, LEXICAL_REF, GENSYM), | |
1140 | expand (CADDR (expr), env)); | |
1141 | case SCM_EXPANDED_TOPLEVEL_REF: | |
1142 | return TOPLEVEL_SET (scm_source_properties (expr), | |
1143 | SCM_EXPANDED_REF (vmem, TOPLEVEL_REF, NAME), | |
1144 | expand (CADDR (expr), env)); | |
1145 | case SCM_EXPANDED_MODULE_REF: | |
1146 | return MODULE_SET (scm_source_properties (expr), | |
1147 | SCM_EXPANDED_REF (vmem, MODULE_REF, MOD), | |
1148 | SCM_EXPANDED_REF (vmem, MODULE_REF, NAME), | |
1149 | SCM_EXPANDED_REF (vmem, MODULE_REF, PUBLIC), | |
1150 | expand (CADDR (expr), env)); | |
1151 | default: | |
1152 | syntax_error (s_bad_variable, variable, expr); | |
1153 | } | |
1154 | } | |
1155 | ||
1156 | ||
1157 | \f | |
1158 | ||
a310a1d1 AW |
1159 | /* This is the boot expander. It is later replaced with psyntax's sc-expand. */ |
1160 | SCM_DEFINE (scm_macroexpand, "macroexpand", 1, 0, 0, | |
dc3e203e AW |
1161 | (SCM exp), |
1162 | "Expand the expression @var{exp}.") | |
1163 | #define FUNC_NAME s_scm_macroexpand | |
1164 | { | |
1165 | return expand (exp, scm_current_module ()); | |
1166 | } | |
1167 | #undef FUNC_NAME | |
1168 | ||
a310a1d1 AW |
1169 | SCM_DEFINE (scm_macroexpanded_p, "macroexpanded?", 1, 0, 0, |
1170 | (SCM exp), | |
1171 | "Return @code{#t} if @var{exp} is an expanded expression.") | |
1172 | #define FUNC_NAME s_scm_macroexpanded_p | |
1173 | { | |
1174 | return scm_from_bool (SCM_EXPANDED_P (exp)); | |
1175 | } | |
1176 | #undef FUNC_NAME | |
1177 | ||
dc3e203e AW |
1178 | |
1179 | \f | |
1180 | ||
1181 | #define DEFINE_NAMES(type) \ | |
1182 | { \ | |
1183 | static const char *fields[] = SCM_EXPANDED_##type##_FIELD_NAMES; \ | |
1184 | exp_field_names[SCM_EXPANDED_##type] = fields; \ | |
1185 | exp_names[SCM_EXPANDED_##type] = SCM_EXPANDED_##type##_TYPE_NAME; \ | |
1186 | exp_nfields[SCM_EXPANDED_##type] = SCM_NUM_EXPANDED_##type##_FIELDS; \ | |
1187 | } | |
1188 | ||
1189 | static SCM | |
1190 | make_exp_vtable (size_t n) | |
1191 | { | |
1192 | SCM layout, printer, name, code, fields; | |
1193 | ||
1194 | layout = scm_string_to_symbol | |
1195 | (scm_string_append (scm_make_list (scm_from_size_t (exp_nfields[n]), | |
1196 | scm_from_locale_string ("pw")))); | |
1197 | printer = SCM_BOOL_F; | |
25d50a05 | 1198 | name = scm_from_utf8_symbol (exp_names[n]); |
dc3e203e AW |
1199 | code = scm_from_size_t (n); |
1200 | fields = SCM_EOL; | |
1201 | { | |
1202 | size_t m = exp_nfields[n]; | |
1203 | while (m--) | |
25d50a05 | 1204 | fields = scm_cons (scm_from_utf8_symbol (exp_field_names[n][m]), fields); |
dc3e203e AW |
1205 | } |
1206 | ||
1207 | return scm_c_make_struct (scm_exp_vtable_vtable, 0, 5, | |
1208 | SCM_UNPACK (layout), SCM_UNPACK (printer), SCM_UNPACK (name), | |
1209 | SCM_UNPACK (code), SCM_UNPACK (fields)); | |
1210 | } | |
1211 | ||
1212 | void | |
1213 | scm_init_expand () | |
1214 | { | |
1215 | size_t n; | |
1216 | SCM exp_vtable_list = SCM_EOL; | |
1217 | ||
1218 | DEFINE_NAMES (VOID); | |
1219 | DEFINE_NAMES (CONST); | |
1220 | DEFINE_NAMES (PRIMITIVE_REF); | |
1221 | DEFINE_NAMES (LEXICAL_REF); | |
1222 | DEFINE_NAMES (LEXICAL_SET); | |
1223 | DEFINE_NAMES (MODULE_REF); | |
1224 | DEFINE_NAMES (MODULE_SET); | |
1225 | DEFINE_NAMES (TOPLEVEL_REF); | |
1226 | DEFINE_NAMES (TOPLEVEL_SET); | |
1227 | DEFINE_NAMES (TOPLEVEL_DEFINE); | |
1228 | DEFINE_NAMES (CONDITIONAL); | |
7081d4f9 | 1229 | DEFINE_NAMES (CALL); |
a881a4ae | 1230 | DEFINE_NAMES (PRIMCALL); |
6fc3eae4 | 1231 | DEFINE_NAMES (SEQ); |
dc3e203e AW |
1232 | DEFINE_NAMES (LAMBDA); |
1233 | DEFINE_NAMES (LAMBDA_CASE); | |
1234 | DEFINE_NAMES (LET); | |
1235 | DEFINE_NAMES (LETREC); | |
dc3e203e AW |
1236 | |
1237 | scm_exp_vtable_vtable = | |
1238 | scm_make_vtable (scm_from_locale_string (SCM_VTABLE_BASE_LAYOUT "pwuwpw"), | |
1239 | SCM_BOOL_F); | |
1240 | ||
1241 | for (n = 0; n < SCM_NUM_EXPANDED_TYPES; n++) | |
1242 | exp_vtables[n] = make_exp_vtable (n); | |
1243 | ||
1244 | /* Now walk back down, consing in reverse. */ | |
1245 | while (n--) | |
1246 | exp_vtable_list = scm_cons (exp_vtables[n], exp_vtable_list); | |
1247 | ||
ccbc25f3 | 1248 | scm_c_define ("%expanded-vtables", scm_vector (exp_vtable_list)); |
dc3e203e AW |
1249 | |
1250 | #include "libguile/expand.x" | |
1251 | } | |
1252 | ||
1253 | /* | |
1254 | Local Variables: | |
1255 | c-file-style: "gnu" | |
1256 | End: | |
1257 | */ |