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2aed2667 | 1 | /* Copyright (C) 1995,1996,1997,1998,1999,2000,2001,2002,2003,2004,2005,2006,2007,2008,2009,2010,2011,2012 |
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 AW |
58 | SCM_MAKE_EXPANDED_CONST(src, exp) |
59 | #define PRIMITIVE_REF_TYPE(src, name) \ | |
60 | SCM_MAKE_EXPANDED_PRIMITIVE_REF_TYPE(src, name) | |
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) | |
7081d4f9 AW |
77 | #define CALL(src, proc, exps) \ |
78 | SCM_MAKE_EXPANDED_CALL(src, proc, exps) | |
6fc3eae4 AW |
79 | #define SEQ(src, head, tail) \ |
80 | SCM_MAKE_EXPANDED_SEQ(src, head, tail) | |
dc3e203e AW |
81 | #define LAMBDA(src, meta, body) \ |
82 | SCM_MAKE_EXPANDED_LAMBDA(src, meta, body) | |
83 | #define LAMBDA_CASE(src, req, opt, rest, kw, inits, gensyms, body, alternate) \ | |
84 | SCM_MAKE_EXPANDED_LAMBDA_CASE(src, req, opt, rest, kw, inits, gensyms, body, alternate) | |
85 | #define LET(src, names, gensyms, vals, body) \ | |
86 | SCM_MAKE_EXPANDED_LET(src, names, gensyms, vals, body) | |
fb6e61ca AW |
87 | #define LETREC(src, in_order_p, names, gensyms, vals, body) \ |
88 | SCM_MAKE_EXPANDED_LETREC(src, in_order_p, names, gensyms, vals, body) | |
dc3e203e AW |
89 | #define DYNLET(src, fluids, vals, body) \ |
90 | SCM_MAKE_EXPANDED_DYNLET(src, fluids, vals, body) | |
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); | |
156 | SCM_SYNTAX ("with-fluids", expand_with_fluids); | |
157 | SCM_SYNTAX ("eval-when", expand_eval_when); | |
158 | SCM_SYNTAX ("if", expand_if); | |
159 | SCM_SYNTAX ("lambda", expand_lambda); | |
160 | SCM_SYNTAX ("let", expand_let); | |
161 | SCM_SYNTAX ("quote", expand_quote); | |
162 | SCM_SYNTAX ("set!", expand_set_x); | |
163 | ||
164 | /* Convenient syntax during boot, expands to primitive syntax. Replaced after | |
165 | psyntax boots. */ | |
166 | SCM_SYNTAX ("and", expand_and); | |
167 | SCM_SYNTAX ("cond", expand_cond); | |
168 | SCM_SYNTAX ("letrec", expand_letrec); | |
826373a2 | 169 | SCM_SYNTAX ("letrec*", expand_letrec_star); |
dc3e203e AW |
170 | SCM_SYNTAX ("let*", expand_letstar); |
171 | SCM_SYNTAX ("or", expand_or); | |
172 | SCM_SYNTAX ("lambda*", expand_lambda_star); | |
173 | SCM_SYNTAX ("case-lambda", expand_case_lambda); | |
174 | SCM_SYNTAX ("case-lambda*", expand_case_lambda_star); | |
175 | ||
176 | ||
177 | SCM_GLOBAL_SYMBOL (scm_sym_apply, "apply"); | |
178 | SCM_GLOBAL_SYMBOL (scm_sym_arrow, "=>"); | |
179 | SCM_GLOBAL_SYMBOL (scm_sym_at, "@"); | |
180 | SCM_GLOBAL_SYMBOL (scm_sym_atat, "@@"); | |
181 | SCM_GLOBAL_SYMBOL (scm_sym_at_call_with_values, "@call-with-values"); | |
182 | SCM_GLOBAL_SYMBOL (scm_sym_atapply, "@apply"); | |
183 | SCM_GLOBAL_SYMBOL (scm_sym_atcall_cc, "@call-with-current-continuation"); | |
184 | SCM_GLOBAL_SYMBOL (scm_sym_begin, "begin"); | |
185 | SCM_GLOBAL_SYMBOL (scm_sym_case, "case"); | |
186 | SCM_GLOBAL_SYMBOL (scm_sym_cond, "cond"); | |
187 | SCM_GLOBAL_SYMBOL (scm_sym_define, "define"); | |
188 | SCM_GLOBAL_SYMBOL (scm_sym_at_dynamic_wind, "@dynamic-wind"); | |
189 | SCM_GLOBAL_SYMBOL (scm_sym_with_fluids, "with-fluids"); | |
190 | SCM_GLOBAL_SYMBOL (scm_sym_else, "else"); | |
191 | SCM_GLOBAL_SYMBOL (scm_sym_eval_when, "eval-when"); | |
192 | SCM_GLOBAL_SYMBOL (scm_sym_if, "if"); | |
193 | SCM_GLOBAL_SYMBOL (scm_sym_lambda, "lambda"); | |
194 | SCM_GLOBAL_SYMBOL (scm_sym_let, "let"); | |
195 | SCM_GLOBAL_SYMBOL (scm_sym_letrec, "letrec"); | |
196 | SCM_GLOBAL_SYMBOL (scm_sym_letstar, "let*"); | |
197 | SCM_GLOBAL_SYMBOL (scm_sym_or, "or"); | |
198 | SCM_GLOBAL_SYMBOL (scm_sym_at_prompt, "@prompt"); | |
199 | SCM_GLOBAL_SYMBOL (scm_sym_quote, "quote"); | |
200 | SCM_GLOBAL_SYMBOL (scm_sym_set_x, "set!"); | |
201 | SCM_SYMBOL (sym_lambda_star, "lambda*"); | |
202 | SCM_SYMBOL (sym_eval, "eval"); | |
203 | SCM_SYMBOL (sym_load, "load"); | |
204 | ||
205 | SCM_GLOBAL_SYMBOL (scm_sym_unquote, "unquote"); | |
206 | SCM_GLOBAL_SYMBOL (scm_sym_quasiquote, "quasiquote"); | |
207 | SCM_GLOBAL_SYMBOL (scm_sym_uq_splicing, "unquote-splicing"); | |
208 | ||
209 | SCM_KEYWORD (kw_allow_other_keys, "allow-other-keys"); | |
210 | SCM_KEYWORD (kw_optional, "optional"); | |
211 | SCM_KEYWORD (kw_key, "key"); | |
212 | SCM_KEYWORD (kw_rest, "rest"); | |
213 | ||
214 | ||
215 | \f | |
216 | ||
217 | ||
218 | /* Signal a syntax error. We distinguish between the form that caused the | |
219 | * error and the enclosing expression. The error message will print out as | |
220 | * shown in the following pattern. The file name and line number are only | |
221 | * given when they can be determined from the erroneous form or from the | |
222 | * enclosing expression. | |
223 | * | |
224 | * <filename>: In procedure memoization: | |
225 | * <filename>: In file <name>, line <nr>: <error-message> in <expression>. */ | |
226 | ||
227 | static void | |
228 | syntax_error (const char* const msg, const SCM form, const SCM expr) | |
229 | { | |
230 | SCM msg_string = scm_from_locale_string (msg); | |
231 | SCM filename = SCM_BOOL_F; | |
232 | SCM linenr = SCM_BOOL_F; | |
233 | const char *format; | |
234 | SCM args; | |
235 | ||
236 | if (scm_is_pair (form)) | |
237 | { | |
238 | filename = scm_source_property (form, scm_sym_filename); | |
239 | linenr = scm_source_property (form, scm_sym_line); | |
240 | } | |
241 | ||
242 | if (scm_is_false (filename) && scm_is_false (linenr) && scm_is_pair (expr)) | |
243 | { | |
244 | filename = scm_source_property (expr, scm_sym_filename); | |
245 | linenr = scm_source_property (expr, scm_sym_line); | |
246 | } | |
247 | ||
248 | if (!SCM_UNBNDP (expr)) | |
249 | { | |
250 | if (scm_is_true (filename)) | |
251 | { | |
252 | format = "In file ~S, line ~S: ~A ~S in expression ~S."; | |
253 | args = scm_list_5 (filename, linenr, msg_string, form, expr); | |
254 | } | |
255 | else if (scm_is_true (linenr)) | |
256 | { | |
257 | format = "In line ~S: ~A ~S in expression ~S."; | |
258 | args = scm_list_4 (linenr, msg_string, form, expr); | |
259 | } | |
260 | else | |
261 | { | |
262 | format = "~A ~S in expression ~S."; | |
263 | args = scm_list_3 (msg_string, form, expr); | |
264 | } | |
265 | } | |
266 | else | |
267 | { | |
268 | if (scm_is_true (filename)) | |
269 | { | |
270 | format = "In file ~S, line ~S: ~A ~S."; | |
271 | args = scm_list_4 (filename, linenr, msg_string, form); | |
272 | } | |
273 | else if (scm_is_true (linenr)) | |
274 | { | |
275 | format = "In line ~S: ~A ~S."; | |
276 | args = scm_list_3 (linenr, msg_string, form); | |
277 | } | |
278 | else | |
279 | { | |
280 | format = "~A ~S."; | |
281 | args = scm_list_2 (msg_string, form); | |
282 | } | |
283 | } | |
284 | ||
285 | scm_error (syntax_error_key, "memoization", format, args, SCM_BOOL_F); | |
286 | } | |
287 | ||
288 | ||
289 | \f | |
290 | ||
291 | ||
292 | static int | |
293 | expand_env_var_is_free (SCM env, SCM x) | |
294 | { | |
295 | for (; scm_is_pair (env); env = CDR (env)) | |
296 | if (scm_is_eq (x, CAAR (env))) | |
297 | return 0; /* bound */ | |
298 | return 1; /* free */ | |
299 | } | |
300 | ||
301 | static SCM | |
302 | expand_env_ref_macro (SCM env, SCM x) | |
303 | { | |
304 | SCM var; | |
305 | if (!expand_env_var_is_free (env, x)) | |
306 | return SCM_BOOL_F; /* lexical */ | |
307 | ||
308 | var = scm_module_variable (scm_current_module (), x); | |
309 | if (scm_is_true (var) && scm_is_true (scm_variable_bound_p (var)) | |
310 | && scm_is_true (scm_macro_p (scm_variable_ref (var)))) | |
311 | return scm_variable_ref (var); | |
312 | else | |
313 | return SCM_BOOL_F; /* anything else */ | |
314 | } | |
315 | ||
316 | static SCM | |
317 | expand_env_lexical_gensym (SCM env, SCM name) | |
318 | { | |
319 | for (; scm_is_pair (env); env = CDR (env)) | |
320 | if (scm_is_eq (name, CAAR (env))) | |
321 | return CDAR (env); /* bound */ | |
322 | return SCM_BOOL_F; /* free */ | |
323 | } | |
324 | ||
325 | static SCM | |
326 | expand_env_extend (SCM env, SCM names, SCM vars) | |
327 | { | |
328 | while (scm_is_pair (names)) | |
329 | { | |
330 | env = scm_acons (CAR (names), CAR (vars), env); | |
331 | names = CDR (names); | |
332 | vars = CDR (vars); | |
333 | } | |
334 | return env; | |
335 | } | |
336 | ||
337 | static SCM | |
338 | expand (SCM exp, SCM env) | |
339 | { | |
340 | if (scm_is_pair (exp)) | |
341 | { | |
342 | SCM car; | |
343 | scm_t_macro_primitive trans = NULL; | |
344 | SCM macro = SCM_BOOL_F; | |
345 | ||
346 | car = CAR (exp); | |
347 | if (scm_is_symbol (car)) | |
348 | macro = expand_env_ref_macro (env, car); | |
349 | ||
350 | if (scm_is_true (macro)) | |
351 | trans = scm_i_macro_primitive (macro); | |
352 | ||
353 | if (trans) | |
354 | return trans (exp, env); | |
355 | else | |
356 | { | |
357 | SCM arg_exps = SCM_EOL; | |
358 | SCM args = SCM_EOL; | |
359 | SCM proc = CAR (exp); | |
360 | ||
361 | for (arg_exps = CDR (exp); scm_is_pair (arg_exps); | |
362 | arg_exps = CDR (arg_exps)) | |
363 | args = scm_cons (expand (CAR (arg_exps), env), args); | |
364 | if (scm_is_null (arg_exps)) | |
7081d4f9 AW |
365 | return CALL (scm_source_properties (exp), |
366 | expand (proc, env), | |
367 | scm_reverse_x (args, SCM_UNDEFINED)); | |
dc3e203e AW |
368 | else |
369 | syntax_error ("expected a proper list", exp, SCM_UNDEFINED); | |
370 | } | |
371 | } | |
372 | else if (scm_is_symbol (exp)) | |
373 | { | |
374 | SCM gensym = expand_env_lexical_gensym (env, exp); | |
375 | if (scm_is_true (gensym)) | |
376 | return LEXICAL_REF (SCM_BOOL_F, exp, gensym); | |
377 | else | |
378 | return TOPLEVEL_REF (SCM_BOOL_F, exp); | |
379 | } | |
380 | else | |
baeb727b | 381 | return CONST_ (SCM_BOOL_F, exp); |
dc3e203e AW |
382 | } |
383 | ||
384 | static SCM | |
385 | expand_exprs (SCM forms, const SCM env) | |
386 | { | |
387 | SCM ret = SCM_EOL; | |
388 | ||
389 | for (; !scm_is_null (forms); forms = CDR (forms)) | |
390 | ret = scm_cons (expand (CAR (forms), env), ret); | |
391 | return scm_reverse_x (ret, SCM_UNDEFINED); | |
392 | } | |
393 | ||
394 | static SCM | |
395 | expand_sequence (const SCM forms, const SCM env) | |
396 | { | |
397 | ASSERT_SYNTAX (scm_ilength (forms) >= 1, s_bad_expression, | |
398 | scm_cons (scm_sym_begin, forms)); | |
399 | if (scm_is_null (CDR (forms))) | |
400 | return expand (CAR (forms), env); | |
401 | else | |
6fc3eae4 AW |
402 | return SEQ (scm_source_properties (forms), |
403 | expand (CAR (forms), env), | |
404 | expand_sequence (CDR (forms), env)); | |
dc3e203e AW |
405 | } |
406 | ||
407 | ||
408 | \f | |
409 | ||
410 | ||
411 | static SCM | |
412 | expand_at (SCM expr, SCM env SCM_UNUSED) | |
413 | { | |
414 | ASSERT_SYNTAX (scm_ilength (expr) == 3, s_bad_expression, expr); | |
415 | ASSERT_SYNTAX (scm_ilength (CADR (expr)) > 0, s_bad_expression, expr); | |
416 | ASSERT_SYNTAX (scm_is_symbol (CADDR (expr)), s_bad_expression, expr); | |
417 | ||
418 | return MODULE_REF (scm_source_properties (expr), | |
419 | CADR (expr), CADDR (expr), SCM_BOOL_T); | |
420 | } | |
421 | ||
422 | static SCM | |
423 | expand_atat (SCM expr, SCM env SCM_UNUSED) | |
424 | { | |
425 | ASSERT_SYNTAX (scm_ilength (expr) == 3, s_bad_expression, expr); | |
426 | ASSERT_SYNTAX (scm_ilength (CADR (expr)) > 0, s_bad_expression, expr); | |
427 | ASSERT_SYNTAX (scm_is_symbol (CADDR (expr)), s_bad_expression, expr); | |
428 | ||
429 | return MODULE_REF (scm_source_properties (expr), | |
430 | CADR (expr), CADDR (expr), SCM_BOOL_F); | |
431 | } | |
432 | ||
433 | static SCM | |
434 | expand_and (SCM expr, SCM env) | |
435 | { | |
436 | const SCM cdr_expr = CDR (expr); | |
437 | ||
438 | if (scm_is_null (cdr_expr)) | |
baeb727b | 439 | return CONST_ (SCM_BOOL_F, SCM_BOOL_T); |
dc3e203e AW |
440 | |
441 | ASSERT_SYNTAX (scm_is_pair (cdr_expr), s_bad_expression, expr); | |
442 | ||
443 | if (scm_is_null (CDR (cdr_expr))) | |
444 | return expand (CAR (cdr_expr), env); | |
445 | else | |
446 | return CONDITIONAL (scm_source_properties (expr), | |
447 | expand (CAR (cdr_expr), env), | |
448 | expand_and (cdr_expr, env), | |
baeb727b | 449 | CONST_ (SCM_BOOL_F, SCM_BOOL_F)); |
dc3e203e AW |
450 | } |
451 | ||
452 | static SCM | |
453 | expand_begin (SCM expr, SCM env) | |
454 | { | |
455 | const SCM cdr_expr = CDR (expr); | |
456 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 1, s_bad_expression, expr); | |
457 | return expand_sequence (cdr_expr, env); | |
458 | } | |
459 | ||
460 | static SCM | |
461 | expand_cond_clauses (SCM clause, SCM rest, int elp, int alp, SCM env) | |
462 | { | |
463 | SCM test; | |
464 | const long length = scm_ilength (clause); | |
465 | ASSERT_SYNTAX (length >= 1, s_bad_cond_clause, clause); | |
466 | ||
467 | test = CAR (clause); | |
468 | if (scm_is_eq (test, scm_sym_else) && elp) | |
469 | { | |
470 | const int last_clause_p = scm_is_null (rest); | |
471 | ASSERT_SYNTAX (length >= 2, s_bad_cond_clause, clause); | |
472 | ASSERT_SYNTAX (last_clause_p, s_misplaced_else_clause, clause); | |
473 | return expand_sequence (CDR (clause), env); | |
474 | } | |
475 | ||
476 | if (scm_is_null (rest)) | |
baeb727b | 477 | rest = VOID_ (SCM_BOOL_F); |
dc3e203e AW |
478 | else |
479 | rest = expand_cond_clauses (CAR (rest), CDR (rest), elp, alp, env); | |
480 | ||
481 | if (length >= 2 | |
482 | && scm_is_eq (CADR (clause), scm_sym_arrow) | |
483 | && alp) | |
484 | { | |
485 | SCM tmp = scm_gensym (scm_from_locale_string ("cond ")); | |
486 | SCM new_env = scm_acons (tmp, tmp, env); | |
487 | ASSERT_SYNTAX (length > 2, s_missing_recipient, clause); | |
488 | ASSERT_SYNTAX (length == 3, s_extra_expression, clause); | |
489 | return LET (SCM_BOOL_F, | |
490 | scm_list_1 (tmp), | |
491 | scm_list_1 (tmp), | |
492 | scm_list_1 (expand (test, env)), | |
493 | CONDITIONAL (SCM_BOOL_F, | |
494 | LEXICAL_REF (SCM_BOOL_F, tmp, tmp), | |
7081d4f9 AW |
495 | CALL (SCM_BOOL_F, |
496 | expand (CADDR (clause), new_env), | |
497 | scm_list_1 (LEXICAL_REF (SCM_BOOL_F, | |
498 | tmp, tmp))), | |
dc3e203e AW |
499 | rest)); |
500 | } | |
501 | /* FIXME length == 1 case */ | |
502 | else | |
503 | return CONDITIONAL (SCM_BOOL_F, | |
504 | expand (test, env), | |
505 | expand_sequence (CDR (clause), env), | |
506 | rest); | |
507 | } | |
508 | ||
509 | static SCM | |
510 | expand_cond (SCM expr, SCM env) | |
511 | { | |
512 | const int else_literal_p = expand_env_var_is_free (env, scm_sym_else); | |
513 | const int arrow_literal_p = expand_env_var_is_free (env, scm_sym_arrow); | |
514 | const SCM clauses = CDR (expr); | |
515 | ||
516 | ASSERT_SYNTAX (scm_ilength (clauses) >= 0, s_bad_expression, expr); | |
517 | ASSERT_SYNTAX (scm_ilength (clauses) >= 1, s_missing_clauses, expr); | |
518 | ||
519 | return expand_cond_clauses (CAR (clauses), CDR (clauses), | |
520 | else_literal_p, arrow_literal_p, env); | |
521 | } | |
522 | ||
523 | /* lone forward decl */ | |
524 | static SCM expand_lambda (SCM expr, SCM env); | |
525 | ||
526 | /* According to Section 5.2.1 of R5RS we first have to make sure that the | |
527 | variable is bound, and then perform the `(set! variable expression)' | |
528 | operation. However, EXPRESSION _can_ be evaluated before VARIABLE is | |
529 | bound. This means that EXPRESSION won't necessarily be able to assign | |
530 | values to VARIABLE as in `(define foo (begin (set! foo 1) (+ foo 1)))'. */ | |
531 | static SCM | |
532 | expand_define (SCM expr, SCM env) | |
533 | { | |
534 | const SCM cdr_expr = CDR (expr); | |
535 | SCM body; | |
536 | SCM variable; | |
537 | ||
538 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
539 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr); | |
540 | ASSERT_SYNTAX (!scm_is_pair (env), s_bad_define, expr); | |
541 | ||
542 | body = CDR (cdr_expr); | |
543 | variable = CAR (cdr_expr); | |
544 | ||
545 | if (scm_is_pair (variable)) | |
546 | { | |
547 | ASSERT_SYNTAX_2 (scm_is_symbol (CAR (variable)), s_bad_variable, variable, expr); | |
548 | return TOPLEVEL_DEFINE | |
549 | (scm_source_properties (expr), | |
550 | CAR (variable), | |
551 | expand_lambda (scm_cons (scm_sym_lambda, scm_cons (CDR (variable), body)), | |
552 | env)); | |
553 | } | |
554 | ASSERT_SYNTAX_2 (scm_is_symbol (variable), s_bad_variable, variable, expr); | |
555 | ASSERT_SYNTAX (scm_ilength (body) == 1, s_expression, expr); | |
556 | return TOPLEVEL_DEFINE (scm_source_properties (expr), variable, | |
557 | expand (CAR (body), env)); | |
558 | } | |
559 | ||
560 | static SCM | |
561 | expand_with_fluids (SCM expr, SCM env) | |
562 | { | |
563 | SCM binds, fluids, vals; | |
564 | ASSERT_SYNTAX (scm_ilength (expr) >= 3, s_bad_expression, expr); | |
565 | binds = CADR (expr); | |
566 | ASSERT_SYNTAX_2 (scm_ilength (binds) >= 0, s_bad_bindings, binds, expr); | |
567 | for (fluids = SCM_EOL, vals = SCM_EOL; | |
568 | scm_is_pair (binds); | |
569 | binds = CDR (binds)) | |
570 | { | |
571 | SCM binding = CAR (binds); | |
572 | ASSERT_SYNTAX_2 (scm_ilength (CAR (binds)) == 2, s_bad_binding, | |
573 | binding, expr); | |
574 | fluids = scm_cons (expand (CAR (binding), env), fluids); | |
575 | vals = scm_cons (expand (CADR (binding), env), vals); | |
576 | } | |
577 | ||
578 | return DYNLET (scm_source_properties (expr), | |
579 | scm_reverse_x (fluids, SCM_UNDEFINED), | |
580 | scm_reverse_x (vals, SCM_UNDEFINED), | |
581 | expand_sequence (CDDR (expr), env)); | |
582 | } | |
583 | ||
584 | static SCM | |
585 | expand_eval_when (SCM expr, SCM env) | |
586 | { | |
587 | ASSERT_SYNTAX (scm_ilength (expr) >= 3, s_bad_expression, expr); | |
588 | ASSERT_SYNTAX (scm_ilength (CADR (expr)) > 0, s_bad_expression, expr); | |
589 | ||
590 | if (scm_is_true (scm_memq (sym_eval, CADR (expr))) | |
591 | || scm_is_true (scm_memq (sym_load, CADR (expr)))) | |
592 | return expand_sequence (CDDR (expr), env); | |
593 | else | |
baeb727b | 594 | return VOID_ (scm_source_properties (expr)); |
dc3e203e AW |
595 | } |
596 | ||
597 | static SCM | |
598 | expand_if (SCM expr, SCM env SCM_UNUSED) | |
599 | { | |
600 | const SCM cdr_expr = CDR (expr); | |
601 | const long length = scm_ilength (cdr_expr); | |
602 | ASSERT_SYNTAX (length == 2 || length == 3, s_expression, expr); | |
603 | return CONDITIONAL (scm_source_properties (expr), | |
604 | expand (CADR (expr), env), | |
605 | expand (CADDR (expr), env), | |
606 | ((length == 3) | |
607 | ? expand (CADDDR (expr), env) | |
baeb727b | 608 | : VOID_ (SCM_BOOL_F))); |
dc3e203e AW |
609 | } |
610 | ||
611 | /* A helper function for expand_lambda to support checking for duplicate | |
612 | * formal arguments: Return true if OBJ is `eq?' to one of the elements of | |
613 | * LIST or to the CDR of the last cons. Therefore, LIST may have any of the | |
614 | * forms that a formal argument can have: | |
615 | * <rest>, (<arg1> ...), (<arg1> ... . <rest>) */ | |
616 | static int | |
617 | c_improper_memq (SCM obj, SCM list) | |
618 | { | |
619 | for (; scm_is_pair (list); list = CDR (list)) | |
620 | { | |
621 | if (scm_is_eq (CAR (list), obj)) | |
622 | return 1; | |
623 | } | |
624 | return scm_is_eq (list, obj); | |
625 | } | |
626 | ||
627 | static SCM | |
628 | expand_lambda_case (SCM clause, SCM alternate, SCM env) | |
629 | { | |
630 | SCM formals; | |
631 | SCM rest; | |
632 | SCM req = SCM_EOL; | |
633 | SCM vars = SCM_EOL; | |
634 | SCM body; | |
635 | int nreq = 0; | |
636 | ||
637 | ASSERT_SYNTAX (scm_is_pair (clause) && scm_is_pair (CDR (clause)), | |
638 | s_bad_expression, scm_cons (scm_sym_lambda, clause)); | |
639 | ||
640 | /* Before iterating the list of formal arguments, make sure the formals | |
641 | * actually are given as either a symbol or a non-cyclic list. */ | |
642 | formals = CAR (clause); | |
643 | if (scm_is_pair (formals)) | |
644 | { | |
645 | /* Dirk:FIXME:: We should check for a cyclic list of formals, and if | |
646 | * detected, report a 'Bad formals' error. */ | |
647 | } | |
648 | else | |
649 | ASSERT_SYNTAX_2 (scm_is_symbol (formals) || scm_is_null (formals), | |
650 | s_bad_formals, formals, scm_cons (scm_sym_lambda, clause)); | |
651 | ||
652 | /* Now iterate the list of formal arguments to check if all formals are | |
653 | * symbols, and that there are no duplicates. */ | |
654 | while (scm_is_pair (formals)) | |
655 | { | |
656 | const SCM formal = CAR (formals); | |
657 | formals = CDR (formals); | |
658 | ASSERT_SYNTAX_2 (scm_is_symbol (formal), s_bad_formal, formal, | |
659 | scm_cons (scm_sym_lambda, clause)); | |
660 | ASSERT_SYNTAX_2 (!c_improper_memq (formal, formals), s_duplicate_formal, | |
661 | formal, scm_cons (scm_sym_lambda, clause)); | |
662 | nreq++; | |
663 | req = scm_cons (formal, req); | |
664 | vars = scm_cons (scm_gensym (SCM_UNDEFINED), vars); | |
665 | env = scm_acons (formal, CAR (vars), env); | |
666 | } | |
667 | ||
668 | ASSERT_SYNTAX_2 (scm_is_null (formals) || scm_is_symbol (formals), | |
669 | s_bad_formal, formals, scm_cons (scm_sym_lambda, clause)); | |
670 | if (scm_is_symbol (formals)) | |
671 | { | |
672 | rest = formals; | |
673 | vars = scm_cons (scm_gensym (SCM_UNDEFINED), vars); | |
674 | env = scm_acons (rest, CAR (vars), env); | |
675 | } | |
676 | else | |
677 | rest = SCM_BOOL_F; | |
678 | ||
679 | body = expand_sequence (CDR (clause), env); | |
680 | req = scm_reverse_x (req, SCM_UNDEFINED); | |
681 | vars = scm_reverse_x (vars, SCM_UNDEFINED); | |
682 | ||
683 | if (scm_is_true (alternate) && !(SCM_EXPANDED_P (alternate) && SCM_EXPANDED_TYPE (alternate) == SCM_EXPANDED_LAMBDA_CASE)) | |
684 | abort (); | |
685 | ||
686 | return LAMBDA_CASE (SCM_BOOL_F, req, SCM_BOOL_F, rest, SCM_BOOL_F, | |
687 | SCM_EOL, vars, body, alternate); | |
688 | } | |
689 | ||
690 | static SCM | |
691 | expand_lambda (SCM expr, SCM env) | |
692 | { | |
693 | return LAMBDA (scm_source_properties (expr), | |
694 | SCM_EOL, | |
695 | expand_lambda_case (CDR (expr), SCM_BOOL_F, env)); | |
696 | } | |
697 | ||
698 | static SCM | |
699 | expand_lambda_star_case (SCM clause, SCM alternate, SCM env) | |
700 | { | |
701 | SCM req, opt, kw, allow_other_keys, rest, formals, vars, body, tmp; | |
632ddbf0 | 702 | SCM inits; |
dc3e203e AW |
703 | int nreq, nopt; |
704 | ||
705 | const long length = scm_ilength (clause); | |
706 | ASSERT_SYNTAX (length >= 1, s_bad_expression, | |
707 | scm_cons (sym_lambda_star, clause)); | |
708 | ASSERT_SYNTAX (length >= 2, s_missing_expression, | |
709 | scm_cons (sym_lambda_star, clause)); | |
710 | ||
711 | formals = CAR (clause); | |
712 | body = CDR (clause); | |
713 | ||
714 | nreq = nopt = 0; | |
715 | req = opt = kw = SCM_EOL; | |
716 | rest = allow_other_keys = SCM_BOOL_F; | |
717 | ||
718 | while (scm_is_pair (formals) && scm_is_symbol (CAR (formals))) | |
719 | { | |
720 | nreq++; | |
721 | req = scm_cons (CAR (formals), req); | |
722 | formals = scm_cdr (formals); | |
723 | } | |
724 | ||
725 | if (scm_is_pair (formals) && scm_is_eq (CAR (formals), kw_optional)) | |
726 | { | |
727 | formals = CDR (formals); | |
728 | while (scm_is_pair (formals) | |
729 | && (scm_is_symbol (CAR (formals)) || scm_is_pair (CAR (formals)))) | |
730 | { | |
731 | nopt++; | |
732 | opt = scm_cons (CAR (formals), opt); | |
733 | formals = scm_cdr (formals); | |
734 | } | |
735 | } | |
736 | ||
737 | if (scm_is_pair (formals) && scm_is_eq (CAR (formals), kw_key)) | |
738 | { | |
739 | formals = CDR (formals); | |
740 | while (scm_is_pair (formals) | |
741 | && (scm_is_symbol (CAR (formals)) || scm_is_pair (CAR (formals)))) | |
742 | { | |
743 | kw = scm_cons (CAR (formals), kw); | |
744 | formals = scm_cdr (formals); | |
745 | } | |
746 | } | |
747 | ||
748 | if (scm_is_pair (formals) && scm_is_eq (CAR (formals), kw_allow_other_keys)) | |
749 | { | |
750 | formals = CDR (formals); | |
751 | allow_other_keys = SCM_BOOL_T; | |
752 | } | |
753 | ||
754 | if (scm_is_pair (formals) && scm_is_eq (CAR (formals), kw_rest)) | |
755 | { | |
756 | ASSERT_SYNTAX (scm_ilength (formals) == 2, s_bad_formals, | |
757 | CAR (clause)); | |
758 | rest = CADR (formals); | |
759 | } | |
760 | else if (scm_is_symbol (formals)) | |
761 | rest = formals; | |
762 | else | |
763 | { | |
764 | ASSERT_SYNTAX (scm_is_null (formals), s_bad_formals, CAR (clause)); | |
765 | rest = SCM_BOOL_F; | |
766 | } | |
767 | ||
768 | /* Now, iterate through them a second time, building up an expansion-time | |
769 | environment, checking, expanding and canonicalizing the opt/kw init forms, | |
770 | and eventually memoizing the body as well. Note that the rest argument, if | |
771 | any, is expanded before keyword args, thus necessitating the second | |
772 | pass. | |
773 | ||
774 | Also note that the specific environment during expansion of init | |
775 | expressions here needs to coincide with the environment when psyntax | |
776 | expands. A lot of effort for something that is only used in the bootstrap | |
777 | expandr, you say? Yes. Yes it is. | |
778 | */ | |
779 | ||
780 | vars = SCM_EOL; | |
781 | req = scm_reverse_x (req, SCM_EOL); | |
782 | for (tmp = req; scm_is_pair (tmp); tmp = scm_cdr (tmp)) | |
783 | { | |
784 | vars = scm_cons (scm_gensym (SCM_UNDEFINED), vars); | |
785 | env = scm_acons (CAR (tmp), CAR (vars), env); | |
786 | } | |
787 | ||
788 | /* Build up opt inits and env */ | |
789 | inits = SCM_EOL; | |
790 | opt = scm_reverse_x (opt, SCM_EOL); | |
791 | for (tmp = opt; scm_is_pair (tmp); tmp = scm_cdr (tmp)) | |
792 | { | |
793 | SCM x = CAR (tmp); | |
794 | vars = scm_cons (scm_gensym (SCM_UNDEFINED), vars); | |
795 | env = scm_acons (x, CAR (vars), env); | |
796 | if (scm_is_symbol (x)) | |
baeb727b | 797 | inits = scm_cons (CONST_ (SCM_BOOL_F, SCM_BOOL_F), inits); |
dc3e203e AW |
798 | else |
799 | { | |
800 | ASSERT_SYNTAX (scm_ilength (x) == 2 && scm_is_symbol (CAR (x)), | |
801 | s_bad_formals, CAR (clause)); | |
802 | inits = scm_cons (expand (CADR (x), env), inits); | |
803 | } | |
804 | env = scm_acons (scm_is_symbol (x) ? x : CAR (x), CAR (vars), env); | |
805 | } | |
806 | if (scm_is_null (opt)) | |
807 | opt = SCM_BOOL_F; | |
808 | ||
809 | /* Process rest before keyword args */ | |
810 | if (scm_is_true (rest)) | |
811 | { | |
812 | vars = scm_cons (scm_gensym (SCM_UNDEFINED), vars); | |
813 | env = scm_acons (rest, CAR (vars), env); | |
814 | } | |
815 | ||
632ddbf0 | 816 | /* Build up kw inits, env, and kw-canon list */ |
dc3e203e AW |
817 | if (scm_is_null (kw)) |
818 | kw = SCM_BOOL_F; | |
819 | else | |
820 | { | |
632ddbf0 | 821 | SCM kw_canon = SCM_EOL; |
dc3e203e AW |
822 | kw = scm_reverse_x (kw, SCM_UNDEFINED); |
823 | for (tmp = kw; scm_is_pair (tmp); tmp = scm_cdr (tmp)) | |
824 | { | |
825 | SCM x, sym, k, init; | |
826 | x = CAR (tmp); | |
827 | if (scm_is_symbol (x)) | |
828 | { | |
829 | sym = x; | |
830 | init = SCM_BOOL_F; | |
831 | k = scm_symbol_to_keyword (sym); | |
832 | } | |
833 | else if (scm_ilength (x) == 2 && scm_is_symbol (CAR (x))) | |
834 | { | |
835 | sym = CAR (x); | |
836 | init = CADR (x); | |
837 | k = scm_symbol_to_keyword (sym); | |
838 | } | |
839 | else if (scm_ilength (x) == 3 && scm_is_symbol (CAR (x)) | |
840 | && scm_is_keyword (CADDR (x))) | |
841 | { | |
842 | sym = CAR (x); | |
843 | init = CADR (x); | |
844 | k = CADDR (x); | |
845 | } | |
846 | else | |
847 | syntax_error (s_bad_formals, CAR (clause), SCM_UNDEFINED); | |
848 | ||
dc3e203e AW |
849 | inits = scm_cons (expand (init, env), inits); |
850 | vars = scm_cons (scm_gensym (SCM_UNDEFINED), vars); | |
632ddbf0 | 851 | kw_canon = scm_cons (scm_list_3 (k, sym, CAR (vars)), kw_canon); |
dc3e203e AW |
852 | env = scm_acons (sym, CAR (vars), env); |
853 | } | |
632ddbf0 AW |
854 | kw_canon = scm_reverse_x (kw_canon, SCM_UNDEFINED); |
855 | kw = scm_cons (allow_other_keys, kw_canon); | |
dc3e203e AW |
856 | } |
857 | ||
858 | /* We should check for no duplicates, but given that psyntax does this | |
859 | already, we can punt on it here... */ | |
860 | ||
861 | vars = scm_reverse_x (vars, SCM_UNDEFINED); | |
862 | inits = scm_reverse_x (inits, SCM_UNDEFINED); | |
863 | body = expand_sequence (body, env); | |
864 | ||
865 | return LAMBDA_CASE (SCM_BOOL_F, req, opt, rest, kw, inits, vars, body, | |
866 | alternate); | |
867 | } | |
868 | ||
869 | static SCM | |
870 | expand_lambda_star (SCM expr, SCM env) | |
871 | { | |
872 | return LAMBDA (scm_source_properties (expr), | |
873 | SCM_EOL, | |
874 | expand_lambda_star_case (CDR (expr), SCM_BOOL_F, env)); | |
875 | } | |
876 | ||
877 | static SCM | |
878 | expand_case_lambda_clauses (SCM expr, SCM rest, SCM env) | |
879 | { | |
880 | SCM alt; | |
881 | ||
882 | if (scm_is_pair (rest)) | |
883 | alt = expand_case_lambda_clauses (CAR (rest), CDR (rest), env); | |
884 | else | |
885 | alt = SCM_BOOL_F; | |
886 | ||
887 | return expand_lambda_case (expr, alt, env); | |
888 | } | |
889 | ||
890 | static SCM | |
891 | expand_case_lambda (SCM expr, SCM env) | |
892 | { | |
893 | ASSERT_SYNTAX (scm_is_pair (CDR (expr)), s_missing_expression, expr); | |
894 | ||
895 | return LAMBDA (scm_source_properties (expr), | |
896 | SCM_EOL, | |
897 | expand_case_lambda_clauses (CADR (expr), CDDR (expr), env)); | |
898 | } | |
899 | ||
900 | static SCM | |
901 | expand_case_lambda_star_clauses (SCM expr, SCM rest, SCM env) | |
902 | { | |
903 | SCM alt; | |
904 | ||
905 | if (scm_is_pair (rest)) | |
906 | alt = expand_case_lambda_star_clauses (CAR (rest), CDR (rest), env); | |
907 | else | |
908 | alt = SCM_BOOL_F; | |
909 | ||
910 | return expand_lambda_star_case (expr, alt, env); | |
911 | } | |
912 | ||
913 | static SCM | |
914 | expand_case_lambda_star (SCM expr, SCM env) | |
915 | { | |
916 | ASSERT_SYNTAX (scm_is_pair (CDR (expr)), s_missing_expression, expr); | |
917 | ||
918 | return LAMBDA (scm_source_properties (expr), | |
919 | SCM_EOL, | |
920 | expand_case_lambda_star_clauses (CADR (expr), CDDR (expr), env)); | |
921 | } | |
922 | ||
923 | /* Check if the format of the bindings is ((<symbol> <init-form>) ...). */ | |
924 | static void | |
925 | check_bindings (const SCM bindings, const SCM expr) | |
926 | { | |
927 | SCM binding_idx; | |
928 | ||
929 | ASSERT_SYNTAX_2 (scm_ilength (bindings) >= 0, | |
930 | s_bad_bindings, bindings, expr); | |
931 | ||
932 | binding_idx = bindings; | |
933 | for (; !scm_is_null (binding_idx); binding_idx = CDR (binding_idx)) | |
934 | { | |
935 | SCM name; /* const */ | |
936 | ||
937 | const SCM binding = CAR (binding_idx); | |
938 | ASSERT_SYNTAX_2 (scm_ilength (binding) == 2, | |
939 | s_bad_binding, binding, expr); | |
940 | ||
941 | name = CAR (binding); | |
942 | ASSERT_SYNTAX_2 (scm_is_symbol (name), s_bad_variable, name, expr); | |
943 | } | |
944 | } | |
945 | ||
946 | /* The bindings, which must have the format ((v1 i1) (v2 i2) ... (vn in)), are | |
947 | * transformed to the lists (vn .. v2 v1) and (i1 i2 ... in). If a duplicate | |
948 | * variable name is detected, an error is signalled. */ | |
949 | static void | |
950 | transform_bindings (const SCM bindings, const SCM expr, | |
951 | SCM *const names, SCM *const vars, SCM *const initptr) | |
952 | { | |
953 | SCM rnames = SCM_EOL; | |
954 | SCM rvars = SCM_EOL; | |
955 | SCM rinits = SCM_EOL; | |
956 | SCM binding_idx = bindings; | |
957 | for (; !scm_is_null (binding_idx); binding_idx = CDR (binding_idx)) | |
958 | { | |
959 | const SCM binding = CAR (binding_idx); | |
960 | const SCM CDR_binding = CDR (binding); | |
961 | const SCM name = CAR (binding); | |
962 | ASSERT_SYNTAX_2 (scm_is_false (scm_c_memq (name, rnames)), | |
963 | s_duplicate_binding, name, expr); | |
964 | rnames = scm_cons (name, rnames); | |
965 | rvars = scm_cons (scm_gensym (SCM_UNDEFINED), rvars); | |
966 | rinits = scm_cons (CAR (CDR_binding), rinits); | |
967 | } | |
968 | *names = scm_reverse_x (rnames, SCM_UNDEFINED); | |
969 | *vars = scm_reverse_x (rvars, SCM_UNDEFINED); | |
970 | *initptr = scm_reverse_x (rinits, SCM_UNDEFINED); | |
971 | } | |
972 | ||
973 | /* FIXME: Remove named let in this boot expander. */ | |
974 | static SCM | |
975 | expand_named_let (const SCM expr, SCM env) | |
976 | { | |
977 | SCM var_names, var_syms, inits; | |
978 | SCM inner_env; | |
979 | SCM name_sym; | |
980 | ||
981 | const SCM cdr_expr = CDR (expr); | |
982 | const SCM name = CAR (cdr_expr); | |
983 | const SCM cddr_expr = CDR (cdr_expr); | |
984 | const SCM bindings = CAR (cddr_expr); | |
985 | check_bindings (bindings, expr); | |
986 | ||
987 | transform_bindings (bindings, expr, &var_names, &var_syms, &inits); | |
988 | name_sym = scm_gensym (SCM_UNDEFINED); | |
989 | inner_env = scm_acons (name, name_sym, env); | |
990 | inner_env = expand_env_extend (inner_env, var_names, var_syms); | |
991 | ||
992 | return LETREC | |
fb6e61ca | 993 | (scm_source_properties (expr), SCM_BOOL_F, |
dc3e203e AW |
994 | scm_list_1 (name), scm_list_1 (name_sym), |
995 | scm_list_1 (LAMBDA (SCM_BOOL_F, | |
996 | SCM_EOL, | |
997 | LAMBDA_CASE (SCM_BOOL_F, var_names, SCM_BOOL_F, SCM_BOOL_F, | |
998 | SCM_BOOL_F, SCM_BOOL_F, var_syms, | |
999 | expand_sequence (CDDDR (expr), inner_env), | |
1000 | SCM_BOOL_F))), | |
7081d4f9 AW |
1001 | CALL (SCM_BOOL_F, |
1002 | LEXICAL_REF (SCM_BOOL_F, name, name_sym), | |
1003 | expand_exprs (inits, env))); | |
dc3e203e AW |
1004 | } |
1005 | ||
1006 | static SCM | |
1007 | expand_let (SCM expr, SCM env) | |
1008 | { | |
1009 | SCM bindings; | |
1010 | ||
1011 | const SCM cdr_expr = CDR (expr); | |
1012 | const long length = scm_ilength (cdr_expr); | |
1013 | ASSERT_SYNTAX (length >= 0, s_bad_expression, expr); | |
1014 | ASSERT_SYNTAX (length >= 2, s_missing_expression, expr); | |
1015 | ||
1016 | bindings = CAR (cdr_expr); | |
1017 | if (scm_is_symbol (bindings)) | |
1018 | { | |
1019 | ASSERT_SYNTAX (length >= 3, s_missing_expression, expr); | |
1020 | return expand_named_let (expr, env); | |
1021 | } | |
1022 | ||
1023 | check_bindings (bindings, expr); | |
1024 | if (scm_is_null (bindings)) | |
1025 | return expand_sequence (CDDR (expr), env); | |
1026 | else | |
1027 | { | |
1028 | SCM var_names, var_syms, inits; | |
1029 | transform_bindings (bindings, expr, &var_names, &var_syms, &inits); | |
1030 | return LET (SCM_BOOL_F, | |
1031 | var_names, var_syms, expand_exprs (inits, env), | |
1032 | expand_sequence (CDDR (expr), | |
1033 | expand_env_extend (env, var_names, | |
1034 | var_syms))); | |
1035 | } | |
1036 | } | |
1037 | ||
1038 | static SCM | |
826373a2 | 1039 | expand_letrec_helper (SCM expr, SCM env, SCM in_order_p) |
dc3e203e AW |
1040 | { |
1041 | SCM bindings; | |
1042 | ||
1043 | const SCM cdr_expr = CDR (expr); | |
1044 | const long length = scm_ilength (cdr_expr); | |
1045 | ASSERT_SYNTAX (length >= 0, s_bad_expression, expr); | |
1046 | ASSERT_SYNTAX (length >= 2, s_missing_expression, expr); | |
1047 | ||
1048 | bindings = CAR (cdr_expr); | |
1049 | check_bindings (bindings, expr); | |
1050 | if (scm_is_null (bindings)) | |
1051 | return expand_sequence (CDDR (expr), env); | |
1052 | else | |
1053 | { | |
1054 | SCM var_names, var_syms, inits; | |
1055 | transform_bindings (bindings, expr, &var_names, &var_syms, &inits); | |
1056 | env = expand_env_extend (env, var_names, var_syms); | |
826373a2 | 1057 | return LETREC (SCM_BOOL_F, in_order_p, |
dc3e203e AW |
1058 | var_names, var_syms, expand_exprs (inits, env), |
1059 | expand_sequence (CDDR (expr), env)); | |
1060 | } | |
1061 | } | |
1062 | ||
826373a2 AW |
1063 | static SCM |
1064 | expand_letrec (SCM expr, SCM env) | |
1065 | { | |
1066 | return expand_letrec_helper (expr, env, SCM_BOOL_F); | |
1067 | } | |
1068 | ||
1069 | static SCM | |
1070 | expand_letrec_star (SCM expr, SCM env) | |
1071 | { | |
1072 | return expand_letrec_helper (expr, env, SCM_BOOL_T); | |
1073 | } | |
1074 | ||
dc3e203e AW |
1075 | static SCM |
1076 | expand_letstar_clause (SCM bindings, SCM body, SCM env SCM_UNUSED) | |
1077 | { | |
1078 | if (scm_is_null (bindings)) | |
1079 | return expand_sequence (body, env); | |
1080 | else | |
1081 | { | |
1082 | SCM bind, name, sym, init; | |
1083 | ||
1084 | ASSERT_SYNTAX (scm_is_pair (bindings), s_bad_expression, bindings); | |
1085 | bind = CAR (bindings); | |
1086 | ASSERT_SYNTAX (scm_ilength (bind) == 2, s_bad_binding, bind); | |
1087 | name = CAR (bind); | |
1088 | sym = scm_gensym (SCM_UNDEFINED); | |
1089 | init = CADR (bind); | |
1090 | ||
1091 | return LET (SCM_BOOL_F, scm_list_1 (name), scm_list_1 (sym), | |
1092 | scm_list_1 (expand (init, env)), | |
1093 | expand_letstar_clause (CDR (bindings), body, | |
1094 | scm_acons (name, sym, env))); | |
1095 | } | |
1096 | } | |
1097 | ||
1098 | static SCM | |
1099 | expand_letstar (SCM expr, SCM env SCM_UNUSED) | |
1100 | { | |
1101 | const SCM cdr_expr = CDR (expr); | |
1102 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1103 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr); | |
1104 | ||
1105 | return expand_letstar_clause (CADR (expr), CDDR (expr), env); | |
1106 | } | |
1107 | ||
1108 | static SCM | |
1109 | expand_or (SCM expr, SCM env SCM_UNUSED) | |
1110 | { | |
1111 | SCM tail = CDR (expr); | |
1112 | const long length = scm_ilength (tail); | |
1113 | ||
1114 | ASSERT_SYNTAX (length >= 0, s_bad_expression, expr); | |
1115 | ||
1116 | if (scm_is_null (CDR (expr))) | |
baeb727b | 1117 | return CONST_ (SCM_BOOL_F, SCM_BOOL_F); |
dc3e203e AW |
1118 | else |
1119 | { | |
1120 | SCM tmp = scm_gensym (SCM_UNDEFINED); | |
1121 | return LET (SCM_BOOL_F, | |
1122 | scm_list_1 (tmp), scm_list_1 (tmp), | |
1123 | scm_list_1 (expand (CADR (expr), env)), | |
1124 | CONDITIONAL (SCM_BOOL_F, | |
1125 | LEXICAL_REF (SCM_BOOL_F, tmp, tmp), | |
1126 | LEXICAL_REF (SCM_BOOL_F, tmp, tmp), | |
1127 | expand_or (CDR (expr), | |
1128 | scm_acons (tmp, tmp, env)))); | |
1129 | } | |
1130 | } | |
1131 | ||
1132 | static SCM | |
1133 | expand_quote (SCM expr, SCM env SCM_UNUSED) | |
1134 | { | |
1135 | SCM quotee; | |
1136 | ||
1137 | const SCM cdr_expr = CDR (expr); | |
1138 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1139 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 1, s_expression, expr); | |
1140 | quotee = CAR (cdr_expr); | |
baeb727b | 1141 | return CONST_ (scm_source_properties (expr), quotee); |
dc3e203e AW |
1142 | } |
1143 | ||
1144 | static SCM | |
1145 | expand_set_x (SCM expr, SCM env) | |
1146 | { | |
1147 | SCM variable; | |
1148 | SCM vmem; | |
1149 | ||
1150 | const SCM cdr_expr = CDR (expr); | |
1151 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1152 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_expression, expr); | |
1153 | variable = CAR (cdr_expr); | |
1154 | vmem = expand (variable, env); | |
1155 | ||
1156 | switch (SCM_EXPANDED_TYPE (vmem)) | |
1157 | { | |
1158 | case SCM_EXPANDED_LEXICAL_REF: | |
1159 | return LEXICAL_SET (scm_source_properties (expr), | |
1160 | SCM_EXPANDED_REF (vmem, LEXICAL_REF, NAME), | |
1161 | SCM_EXPANDED_REF (vmem, LEXICAL_REF, GENSYM), | |
1162 | expand (CADDR (expr), env)); | |
1163 | case SCM_EXPANDED_TOPLEVEL_REF: | |
1164 | return TOPLEVEL_SET (scm_source_properties (expr), | |
1165 | SCM_EXPANDED_REF (vmem, TOPLEVEL_REF, NAME), | |
1166 | expand (CADDR (expr), env)); | |
1167 | case SCM_EXPANDED_MODULE_REF: | |
1168 | return MODULE_SET (scm_source_properties (expr), | |
1169 | SCM_EXPANDED_REF (vmem, MODULE_REF, MOD), | |
1170 | SCM_EXPANDED_REF (vmem, MODULE_REF, NAME), | |
1171 | SCM_EXPANDED_REF (vmem, MODULE_REF, PUBLIC), | |
1172 | expand (CADDR (expr), env)); | |
1173 | default: | |
1174 | syntax_error (s_bad_variable, variable, expr); | |
1175 | } | |
1176 | } | |
1177 | ||
1178 | ||
1179 | \f | |
1180 | ||
a310a1d1 AW |
1181 | /* This is the boot expander. It is later replaced with psyntax's sc-expand. */ |
1182 | SCM_DEFINE (scm_macroexpand, "macroexpand", 1, 0, 0, | |
dc3e203e AW |
1183 | (SCM exp), |
1184 | "Expand the expression @var{exp}.") | |
1185 | #define FUNC_NAME s_scm_macroexpand | |
1186 | { | |
1187 | return expand (exp, scm_current_module ()); | |
1188 | } | |
1189 | #undef FUNC_NAME | |
1190 | ||
a310a1d1 AW |
1191 | SCM_DEFINE (scm_macroexpanded_p, "macroexpanded?", 1, 0, 0, |
1192 | (SCM exp), | |
1193 | "Return @code{#t} if @var{exp} is an expanded expression.") | |
1194 | #define FUNC_NAME s_scm_macroexpanded_p | |
1195 | { | |
1196 | return scm_from_bool (SCM_EXPANDED_P (exp)); | |
1197 | } | |
1198 | #undef FUNC_NAME | |
1199 | ||
dc3e203e AW |
1200 | |
1201 | \f | |
1202 | ||
1203 | #define DEFINE_NAMES(type) \ | |
1204 | { \ | |
1205 | static const char *fields[] = SCM_EXPANDED_##type##_FIELD_NAMES; \ | |
1206 | exp_field_names[SCM_EXPANDED_##type] = fields; \ | |
1207 | exp_names[SCM_EXPANDED_##type] = SCM_EXPANDED_##type##_TYPE_NAME; \ | |
1208 | exp_nfields[SCM_EXPANDED_##type] = SCM_NUM_EXPANDED_##type##_FIELDS; \ | |
1209 | } | |
1210 | ||
1211 | static SCM | |
1212 | make_exp_vtable (size_t n) | |
1213 | { | |
1214 | SCM layout, printer, name, code, fields; | |
1215 | ||
1216 | layout = scm_string_to_symbol | |
1217 | (scm_string_append (scm_make_list (scm_from_size_t (exp_nfields[n]), | |
1218 | scm_from_locale_string ("pw")))); | |
1219 | printer = SCM_BOOL_F; | |
25d50a05 | 1220 | name = scm_from_utf8_symbol (exp_names[n]); |
dc3e203e AW |
1221 | code = scm_from_size_t (n); |
1222 | fields = SCM_EOL; | |
1223 | { | |
1224 | size_t m = exp_nfields[n]; | |
1225 | while (m--) | |
25d50a05 | 1226 | fields = scm_cons (scm_from_utf8_symbol (exp_field_names[n][m]), fields); |
dc3e203e AW |
1227 | } |
1228 | ||
1229 | return scm_c_make_struct (scm_exp_vtable_vtable, 0, 5, | |
1230 | SCM_UNPACK (layout), SCM_UNPACK (printer), SCM_UNPACK (name), | |
1231 | SCM_UNPACK (code), SCM_UNPACK (fields)); | |
1232 | } | |
1233 | ||
1234 | void | |
1235 | scm_init_expand () | |
1236 | { | |
1237 | size_t n; | |
1238 | SCM exp_vtable_list = SCM_EOL; | |
1239 | ||
1240 | DEFINE_NAMES (VOID); | |
1241 | DEFINE_NAMES (CONST); | |
1242 | DEFINE_NAMES (PRIMITIVE_REF); | |
1243 | DEFINE_NAMES (LEXICAL_REF); | |
1244 | DEFINE_NAMES (LEXICAL_SET); | |
1245 | DEFINE_NAMES (MODULE_REF); | |
1246 | DEFINE_NAMES (MODULE_SET); | |
1247 | DEFINE_NAMES (TOPLEVEL_REF); | |
1248 | DEFINE_NAMES (TOPLEVEL_SET); | |
1249 | DEFINE_NAMES (TOPLEVEL_DEFINE); | |
1250 | DEFINE_NAMES (CONDITIONAL); | |
7081d4f9 | 1251 | DEFINE_NAMES (CALL); |
a881a4ae | 1252 | DEFINE_NAMES (PRIMCALL); |
6fc3eae4 | 1253 | DEFINE_NAMES (SEQ); |
dc3e203e AW |
1254 | DEFINE_NAMES (LAMBDA); |
1255 | DEFINE_NAMES (LAMBDA_CASE); | |
1256 | DEFINE_NAMES (LET); | |
1257 | DEFINE_NAMES (LETREC); | |
1258 | DEFINE_NAMES (DYNLET); | |
1259 | ||
1260 | scm_exp_vtable_vtable = | |
1261 | scm_make_vtable (scm_from_locale_string (SCM_VTABLE_BASE_LAYOUT "pwuwpw"), | |
1262 | SCM_BOOL_F); | |
1263 | ||
1264 | for (n = 0; n < SCM_NUM_EXPANDED_TYPES; n++) | |
1265 | exp_vtables[n] = make_exp_vtable (n); | |
1266 | ||
1267 | /* Now walk back down, consing in reverse. */ | |
1268 | while (n--) | |
1269 | exp_vtable_list = scm_cons (exp_vtables[n], exp_vtable_list); | |
1270 | ||
ccbc25f3 | 1271 | scm_c_define ("%expanded-vtables", scm_vector (exp_vtable_list)); |
dc3e203e AW |
1272 | |
1273 | #include "libguile/expand.x" | |
1274 | } | |
1275 | ||
1276 | /* | |
1277 | Local Variables: | |
1278 | c-file-style: "gnu" | |
1279 | End: | |
1280 | */ |