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1 | ;;;; -*-scheme-*- |
2 | ;;;; | |
cd5fea8d | 3 | ;;;; Copyright (C) 2001, 2003, 2006 Free Software Foundation, Inc. |
86b96c16 | 4 | ;;;; |
73be1d9e MV |
5 | ;;;; This library is free software; you can redistribute it and/or |
6 | ;;;; modify it under the terms of the GNU Lesser General Public | |
7 | ;;;; License as published by the Free Software Foundation; either | |
8 | ;;;; version 2.1 of the License, or (at your option) any later version. | |
86b96c16 | 9 | ;;;; |
73be1d9e | 10 | ;;;; This library is distributed in the hope that it will be useful, |
86b96c16 | 11 | ;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of |
73be1d9e MV |
12 | ;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | ;;;; Lesser General Public License for more details. | |
86b96c16 | 14 | ;;;; |
73be1d9e MV |
15 | ;;;; You should have received a copy of the GNU Lesser General Public |
16 | ;;;; License along with this library; if not, write to the Free Software | |
92205699 | 17 | ;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
86b96c16 MD |
18 | ;;;; |
19 | \f | |
20 | ||
a63812a2 JB |
21 | ;;; Portable implementation of syntax-case |
22 | ;;; Extracted from Chez Scheme Version 5.9f | |
23 | ;;; Authors: R. Kent Dybvig, Oscar Waddell, Bob Hieb, Carl Bruggeman | |
24 | ||
41af2381 AW |
25 | ;;; Modified by Andy Wingo <wingo@pobox.com> according to the Git |
26 | ;;; revision control logs corresponding to this file: 2009. | |
27 | ||
86b96c16 MD |
28 | ;;; Modified by Mikael Djurfeldt <djurfeldt@nada.kth.se> according |
29 | ;;; to the ChangeLog distributed in the same directory as this file: | |
30 | ;;; 1997-08-19, 1997-09-03, 1997-09-10, 2000-08-13, 2000-08-24, | |
31 | ;;; 2000-09-12, 2001-03-08 | |
32 | ||
a63812a2 JB |
33 | ;;; Copyright (c) 1992-1997 Cadence Research Systems |
34 | ;;; Permission to copy this software, in whole or in part, to use this | |
35 | ;;; software for any lawful purpose, and to redistribute this software | |
36 | ;;; is granted subject to the restriction that all copies made of this | |
37 | ;;; software must include this copyright notice in full. This software | |
38 | ;;; is provided AS IS, with NO WARRANTY, EITHER EXPRESS OR IMPLIED, | |
39 | ;;; INCLUDING BUT NOT LIMITED TO IMPLIED WARRANTIES OF MERCHANTABILITY | |
40 | ;;; OR FITNESS FOR ANY PARTICULAR PURPOSE. IN NO EVENT SHALL THE | |
41 | ;;; AUTHORS BE LIABLE FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES OF ANY | |
42 | ;;; NATURE WHATSOEVER. | |
43 | ||
a63812a2 JB |
44 | ;;; Before attempting to port this code to a new implementation of |
45 | ;;; Scheme, please read the notes below carefully. | |
46 | ||
47 | ||
48 | ;;; This file defines the syntax-case expander, sc-expand, and a set | |
49 | ;;; of associated syntactic forms and procedures. Of these, the | |
50 | ;;; following are documented in The Scheme Programming Language, | |
51 | ;;; Second Edition (R. Kent Dybvig, Prentice Hall, 1996). Most are | |
52 | ;;; also documented in the R4RS and draft R5RS. | |
53 | ;;; | |
54 | ;;; bound-identifier=? | |
22225fc1 | 55 | ;;; datum->syntax |
a63812a2 JB |
56 | ;;; define-syntax |
57 | ;;; fluid-let-syntax | |
58 | ;;; free-identifier=? | |
59 | ;;; generate-temporaries | |
60 | ;;; identifier? | |
61 | ;;; identifier-syntax | |
62 | ;;; let-syntax | |
63 | ;;; letrec-syntax | |
64 | ;;; syntax | |
65 | ;;; syntax-case | |
22225fc1 | 66 | ;;; syntax->datum |
a63812a2 JB |
67 | ;;; syntax-rules |
68 | ;;; with-syntax | |
69 | ;;; | |
70 | ;;; All standard Scheme syntactic forms are supported by the expander | |
71 | ;;; or syntactic abstractions defined in this file. Only the R4RS | |
72 | ;;; delay is omitted, since its expansion is implementation-dependent. | |
73 | ||
74 | ;;; The remaining exports are listed below: | |
75 | ;;; | |
76 | ;;; (sc-expand datum) | |
77 | ;;; if datum represents a valid expression, sc-expand returns an | |
78 | ;;; expanded version of datum in a core language that includes no | |
79 | ;;; syntactic abstractions. The core language includes begin, | |
80 | ;;; define, if, lambda, letrec, quote, and set!. | |
81 | ;;; (eval-when situations expr ...) | |
82 | ;;; conditionally evaluates expr ... at compile-time or run-time | |
83 | ;;; depending upon situations (see the Chez Scheme System Manual, | |
84 | ;;; Revision 3, for a complete description) | |
e4721dde | 85 | ;;; (syntax-violation who message form [subform]) |
a63812a2 | 86 | ;;; used to report errors found during expansion |
5f1a2fb1 | 87 | ;;; ($sc-dispatch e p) |
a63812a2 JB |
88 | ;;; used by expanded code to handle syntax-case matching |
89 | ||
90 | ;;; The following nonstandard procedures must be provided by the | |
a63812a2 | 91 | ;;; implementation for this code to run using the standard portable |
41af2381 | 92 | ;;; hooks and output constructors. They are not used by expanded code, |
a63812a2 JB |
93 | ;;; and so need be present only at expansion time. |
94 | ;;; | |
95 | ;;; (eval x) | |
96 | ;;; where x is always in the form ("noexpand" expr). | |
97 | ;;; returns the value of expr. the "noexpand" flag is used to tell the | |
98 | ;;; evaluator/expander that no expansion is necessary, since expr has | |
99 | ;;; already been fully expanded to core forms. | |
100 | ;;; | |
101 | ;;; eval will not be invoked during the loading of psyntax.pp. After | |
102 | ;;; psyntax.pp has been loaded, the expansion of any macro definition, | |
103 | ;;; whether local or global, will result in a call to eval. If, however, | |
104 | ;;; sc-expand has already been registered as the expander to be used | |
105 | ;;; by eval, and eval accepts one argument, nothing special must be done | |
106 | ;;; to support the "noexpand" flag, since it is handled by sc-expand. | |
107 | ;;; | |
a63812a2 JB |
108 | ;;; (gensym) |
109 | ;;; returns a unique symbol each time it's called | |
a63812a2 JB |
110 | |
111 | ;;; When porting to a new Scheme implementation, you should define the | |
112 | ;;; procedures listed above, load the expanded version of psyntax.ss | |
113 | ;;; (psyntax.pp, which should be available whereever you found | |
114 | ;;; psyntax.ss), and register sc-expand as the current expander (how | |
115 | ;;; you do this depends upon your implementation of Scheme). You may | |
116 | ;;; change the hooks and constructors defined toward the beginning of | |
117 | ;;; the code below, but to avoid bootstrapping problems, do so only | |
118 | ;;; after you have a working version of the expander. | |
119 | ||
120 | ;;; Chez Scheme allows the syntactic form (syntax <template>) to be | |
121 | ;;; abbreviated to #'<template>, just as (quote <datum>) may be | |
122 | ;;; abbreviated to '<datum>. The #' syntax makes programs written | |
123 | ;;; using syntax-case shorter and more readable and draws out the | |
124 | ;;; intuitive connection between syntax and quote. | |
125 | ||
126 | ;;; If you find that this code loads or runs slowly, consider | |
127 | ;;; switching to faster hardware or a faster implementation of | |
128 | ;;; Scheme. In Chez Scheme on a 200Mhz Pentium Pro, expanding, | |
129 | ;;; compiling (with full optimization), and loading this file takes | |
130 | ;;; between one and two seconds. | |
131 | ||
132 | ;;; In the expander implementation, we sometimes use syntactic abstractions | |
133 | ;;; when procedural abstractions would suffice. For example, we define | |
134 | ;;; top-wrap and top-marked? as | |
135 | ;;; (define-syntax top-wrap (identifier-syntax '((top)))) | |
136 | ;;; (define-syntax top-marked? | |
137 | ;;; (syntax-rules () | |
138 | ;;; ((_ w) (memq 'top (wrap-marks w))))) | |
139 | ;;; rather than | |
140 | ;;; (define top-wrap '((top))) | |
141 | ;;; (define top-marked? | |
142 | ;;; (lambda (w) (memq 'top (wrap-marks w)))) | |
143 | ;;; On ther other hand, we don't do this consistently; we define make-wrap, | |
144 | ;;; wrap-marks, and wrap-subst simply as | |
145 | ;;; (define make-wrap cons) | |
146 | ;;; (define wrap-marks car) | |
147 | ;;; (define wrap-subst cdr) | |
148 | ;;; In Chez Scheme, the syntactic and procedural forms of these | |
149 | ;;; abstractions are equivalent, since the optimizer consistently | |
150 | ;;; integrates constants and small procedures. Some Scheme | |
151 | ;;; implementations, however, may benefit from more consistent use | |
152 | ;;; of one form or the other. | |
153 | ||
154 | ||
155 | ;;; implementation information: | |
156 | ||
157 | ;;; "begin" is treated as a splicing construct at top level and at | |
158 | ;;; the beginning of bodies. Any sequence of expressions that would | |
159 | ;;; be allowed where the "begin" occurs is allowed. | |
160 | ||
161 | ;;; "let-syntax" and "letrec-syntax" are also treated as splicing | |
162 | ;;; constructs, in violation of the R4RS appendix and probably the R5RS | |
163 | ;;; when it comes out. A consequence, let-syntax and letrec-syntax do | |
164 | ;;; not create local contours, as do let and letrec. Although the | |
165 | ;;; functionality is greater as it is presently implemented, we will | |
166 | ;;; probably change it to conform to the R4RS/expected R5RS. | |
167 | ||
168 | ;;; Objects with no standard print syntax, including objects containing | |
169 | ;;; cycles and syntax object, are allowed in quoted data as long as they | |
22225fc1 | 170 | ;;; are contained within a syntax form or produced by datum->syntax. |
a63812a2 JB |
171 | ;;; Such objects are never copied. |
172 | ||
173 | ;;; All identifiers that don't have macro definitions and are not bound | |
174 | ;;; lexically are assumed to be global variables | |
175 | ||
176 | ;;; Top-level definitions of macro-introduced identifiers are allowed. | |
177 | ;;; This may not be appropriate for implementations in which the | |
178 | ;;; model is that bindings are created by definitions, as opposed to | |
179 | ;;; one in which initial values are assigned by definitions. | |
180 | ||
181 | ;;; Top-level variable definitions of syntax keywords is not permitted. | |
182 | ;;; Any solution allowing this would be kludgey and would yield | |
183 | ;;; surprising results in some cases. We can provide an undefine-syntax | |
184 | ;;; form. The questions is, should define be an implicit undefine-syntax? | |
185 | ;;; We've decided no for now. | |
186 | ||
187 | ;;; Identifiers and syntax objects are implemented as vectors for | |
188 | ;;; portability. As a result, it is possible to "forge" syntax | |
189 | ;;; objects. | |
190 | ||
191 | ;;; The implementation of generate-temporaries assumes that it is possible | |
192 | ;;; to generate globally unique symbols (gensyms). | |
193 | ||
a63812a2 JB |
194 | |
195 | ;;; Bootstrapping: | |
196 | ||
197 | ;;; When changing syntax-object representations, it is necessary to support | |
198 | ;;; both old and new syntax-object representations in id-var-name. It | |
199 | ;;; should be sufficient to recognize old representations and treat | |
200 | ;;; them as not lexically bound. | |
201 | ||
202 | ||
203 | ||
9c35c579 AW |
204 | (eval-when (compile) |
205 | (set-current-module (resolve-module '(guile)))) | |
206 | ||
a63812a2 | 207 | (let () |
4d248541 AW |
208 | ;;; Private version of and-map that handles multiple lists. |
209 | (define and-map* | |
210 | (lambda (f first . rest) | |
211 | (or (null? first) | |
212 | (if (null? rest) | |
213 | (let andmap ((first first)) | |
214 | (let ((x (car first)) (first (cdr first))) | |
215 | (if (null? first) | |
216 | (f x) | |
217 | (and (f x) (andmap first))))) | |
218 | (let andmap ((first first) (rest rest)) | |
219 | (let ((x (car first)) | |
220 | (xr (map car rest)) | |
221 | (first (cdr first)) | |
222 | (rest (map cdr rest))) | |
223 | (if (null? first) | |
224 | (apply f (cons x xr)) | |
225 | (and (apply f (cons x xr)) (andmap first rest))))))))) | |
226 | ||
a63812a2 JB |
227 | (define-syntax define-structure |
228 | (lambda (x) | |
229 | (define construct-name | |
230 | (lambda (template-identifier . args) | |
22225fc1 | 231 | (datum->syntax |
a63812a2 JB |
232 | template-identifier |
233 | (string->symbol | |
234 | (apply string-append | |
235 | (map (lambda (x) | |
236 | (if (string? x) | |
237 | x | |
22225fc1 | 238 | (symbol->string (syntax->datum x)))) |
a63812a2 JB |
239 | args)))))) |
240 | (syntax-case x () | |
241 | ((_ (name id1 ...)) | |
4d248541 | 242 | (and-map identifier? (syntax (name id1 ...))) |
a63812a2 JB |
243 | (with-syntax |
244 | ((constructor (construct-name (syntax name) "make-" (syntax name))) | |
245 | (predicate (construct-name (syntax name) (syntax name) "?")) | |
246 | ((access ...) | |
247 | (map (lambda (x) (construct-name x (syntax name) "-" x)) | |
248 | (syntax (id1 ...)))) | |
249 | ((assign ...) | |
250 | (map (lambda (x) | |
251 | (construct-name x "set-" (syntax name) "-" x "!")) | |
252 | (syntax (id1 ...)))) | |
253 | (structure-length | |
254 | (+ (length (syntax (id1 ...))) 1)) | |
255 | ((index ...) | |
256 | (let f ((i 1) (ids (syntax (id1 ...)))) | |
257 | (if (null? ids) | |
258 | '() | |
259 | (cons i (f (+ i 1) (cdr ids))))))) | |
260 | (syntax (begin | |
261 | (define constructor | |
262 | (lambda (id1 ...) | |
263 | (vector 'name id1 ... ))) | |
264 | (define predicate | |
265 | (lambda (x) | |
266 | (and (vector? x) | |
267 | (= (vector-length x) structure-length) | |
268 | (eq? (vector-ref x 0) 'name)))) | |
269 | (define access | |
270 | (lambda (x) | |
271 | (vector-ref x index))) | |
272 | ... | |
273 | (define assign | |
274 | (lambda (x update) | |
275 | (vector-set! x index update))) | |
276 | ...))))))) | |
277 | ||
278 | (let () | |
279 | (define noexpand "noexpand") | |
71f46dbd | 280 | (define *mode* (make-fluid)) |
a63812a2 JB |
281 | |
282 | ;;; hooks to nonportable run-time helpers | |
283 | (begin | |
284 | (define fx+ +) | |
285 | (define fx- -) | |
286 | (define fx= =) | |
287 | (define fx< <) | |
288 | ||
a63812a2 | 289 | (define top-level-eval-hook |
4e237f14 | 290 | (lambda (x mod) |
71f46dbd AW |
291 | (primitive-eval |
292 | `(,noexpand | |
293 | ,(case (fluid-ref *mode*) | |
811d10f5 | 294 | ((c) ((@ (language tree-il) tree-il->scheme) x)) |
71f46dbd | 295 | (else x)))))) |
a63812a2 JB |
296 | |
297 | (define local-eval-hook | |
4e237f14 | 298 | (lambda (x mod) |
71f46dbd AW |
299 | (primitive-eval |
300 | `(,noexpand | |
301 | ,(case (fluid-ref *mode*) | |
811d10f5 | 302 | ((c) ((@ (language tree-il) tree-il->scheme) x)) |
71f46dbd | 303 | (else x)))))) |
a63812a2 | 304 | |
a63812a2 JB |
305 | (define-syntax gensym-hook |
306 | (syntax-rules () | |
307 | ((_) (gensym)))) | |
308 | ||
309 | (define put-global-definition-hook | |
97ce9dbf | 310 | (lambda (symbol type val) |
3d5f3091 AW |
311 | (let ((existing (let ((v (module-variable (current-module) symbol))) |
312 | (and v (variable-bound? v) | |
313 | (let ((val (variable-ref v))) | |
314 | (and (macro? val) | |
315 | (not (syncase-macro-type val)) | |
316 | val)))))) | |
317 | (module-define! (current-module) | |
318 | symbol | |
319 | (if existing | |
320 | (make-extended-syncase-macro existing type val) | |
321 | (make-syncase-macro type val)))))) | |
c5ad45c7 | 322 | |
a63812a2 | 323 | (define get-global-definition-hook |
8e1d0d50 | 324 | (lambda (symbol module) |
165a7596 AW |
325 | (if (and (not module) (current-module)) |
326 | (warn "module system is booted, we should have a module" symbol)) | |
3d5f3091 AW |
327 | (let ((v (module-variable (if module |
328 | (resolve-module (cdr module)) | |
329 | (current-module)) | |
330 | symbol))) | |
331 | (and v (variable-bound? v) | |
332 | (let ((val (variable-ref v))) | |
333 | (and (macro? val) (syncase-macro-type val) | |
334 | (cons (syncase-macro-type val) | |
335 | (syncase-macro-binding val)))))))) | |
d6ebfd72 | 336 | |
a63812a2 JB |
337 | ) |
338 | ||
339 | ||
340 | ;;; output constructors | |
a1a482e0 AW |
341 | (define build-void |
342 | (lambda (source) | |
343 | (case (fluid-ref *mode*) | |
344 | ((c) ((@ (language tree-il) make-void) source)) | |
345 | (else '(if #f #f))))) | |
346 | ||
811d10f5 AW |
347 | (define build-application |
348 | (lambda (source fun-exp arg-exps) | |
349 | (case (fluid-ref *mode*) | |
350 | ((c) ((@ (language tree-il) make-application) source fun-exp arg-exps)) | |
351 | (else `(,fun-exp . ,arg-exps))))) | |
352 | ||
353 | (define build-conditional | |
354 | (lambda (source test-exp then-exp else-exp) | |
355 | (case (fluid-ref *mode*) | |
356 | ((c) ((@ (language tree-il) make-conditional) | |
357 | source test-exp then-exp else-exp)) | |
02604212 AW |
358 | (else (if (equal? else-exp '(if #f #f)) |
359 | `(if ,test-exp ,then-exp) | |
360 | `(if ,test-exp ,then-exp ,else-exp)))))) | |
a63812a2 | 361 | |
f4a644ee AW |
362 | (define build-lexical-reference |
363 | (lambda (type source name var) | |
811d10f5 AW |
364 | (case (fluid-ref *mode*) |
365 | ((c) ((@ (language tree-il) make-lexical-ref) source name var)) | |
366 | (else var)))) | |
a63812a2 | 367 | |
f4a644ee AW |
368 | (define build-lexical-assignment |
369 | (lambda (source name var exp) | |
811d10f5 AW |
370 | (case (fluid-ref *mode*) |
371 | ((c) ((@ (language tree-il) make-lexical-set) source name var exp)) | |
372 | (else `(set! ,var ,exp))))) | |
a63812a2 | 373 | |
71f46dbd | 374 | ;; Before modules are booted, we can't expand into data structures from |
811d10f5 | 375 | ;; (language tree-il) -- we need to give the evaluator the |
71f46dbd | 376 | ;; s-expressions that it understands natively. Actually the real truth |
982a1c20 | 377 | ;; of the matter is that the evaluator doesn't understand tree-il |
71f46dbd | 378 | ;; structures at all. So until we fix the evaluator, if ever, the |
811d10f5 | 379 | ;; conflation that we should use tree-il iff we are compiling |
71f46dbd AW |
380 | ;; holds true. |
381 | ;; | |
811d10f5 AW |
382 | (define (analyze-variable mod var modref-cont bare-cont) |
383 | (if (not mod) | |
384 | (bare-cont var) | |
385 | (let ((kind (car mod)) | |
386 | (mod (cdr mod))) | |
387 | (case kind | |
388 | ((public) (modref-cont mod var #t)) | |
389 | ((private) (if (not (equal? mod (module-name (current-module)))) | |
390 | (modref-cont mod var #f) | |
391 | (bare-cont var))) | |
392 | ((bare) (bare-cont var)) | |
393 | ((hygiene) (if (and (not (equal? mod (module-name (current-module)))) | |
394 | (module-variable (resolve-module mod) var)) | |
395 | (modref-cont mod var #f) | |
396 | (bare-cont var))) | |
397 | (else (syntax-violation #f "bad module kind" var mod)))))) | |
398 | ||
71f46dbd AW |
399 | (define build-global-reference |
400 | (lambda (source var mod) | |
811d10f5 AW |
401 | (analyze-variable |
402 | mod var | |
403 | (lambda (mod var public?) | |
404 | (case (fluid-ref *mode*) | |
405 | ((c) ((@ (language tree-il) make-module-ref) source mod var public?)) | |
406 | (else (list (if public? '@ '@@) mod var)))) | |
407 | (lambda (var) | |
408 | (case (fluid-ref *mode*) | |
409 | ((c) ((@ (language tree-il) make-toplevel-ref) source var)) | |
410 | (else var)))))) | |
71f46dbd AW |
411 | |
412 | (define build-global-assignment | |
413 | (lambda (source var exp mod) | |
811d10f5 AW |
414 | (analyze-variable |
415 | mod var | |
416 | (lambda (mod var public?) | |
417 | (case (fluid-ref *mode*) | |
418 | ((c) ((@ (language tree-il) make-module-set) source mod var public? exp)) | |
419 | (else `(set! ,(list (if public? '@ '@@) mod var) ,exp)))) | |
420 | (lambda (var) | |
421 | (case (fluid-ref *mode*) | |
422 | ((c) ((@ (language tree-il) make-toplevel-set) source var exp)) | |
423 | (else `(set! ,var ,exp))))))) | |
424 | ||
dc1eed52 AW |
425 | ;; FIXME: there is a bug that prevents (set! ((@ (foo) bar) baz) quz) |
426 | ;; from working. Hack around it. | |
427 | (define (maybe-name-value! name val) | |
428 | (cond | |
429 | (((@ (language tree-il) lambda?) val) | |
430 | (let ((meta ((@ (language tree-il) lambda-meta) val))) | |
431 | (if (not (assq 'name meta)) | |
432 | ((setter (@ (language tree-il) lambda-meta)) | |
433 | val | |
434 | (acons 'name name meta))))))) | |
435 | ||
811d10f5 AW |
436 | (define build-global-definition |
437 | (lambda (source var exp) | |
438 | (case (fluid-ref *mode*) | |
dc1eed52 AW |
439 | ((c) |
440 | (maybe-name-value! var exp) | |
441 | ((@ (language tree-il) make-toplevel-define) source var exp)) | |
811d10f5 AW |
442 | (else `(define ,var ,exp))))) |
443 | ||
444 | (define build-lambda | |
547a602d | 445 | (lambda (src ids vars docstring exp) |
811d10f5 | 446 | (case (fluid-ref *mode*) |
696495f4 | 447 | ((c) ((@ (language tree-il) make-lambda) src ids vars |
811d10f5 AW |
448 | (if docstring `((documentation . ,docstring)) '()) |
449 | exp)) | |
450 | (else `(lambda ,vars ,@(if docstring (list docstring) '()) | |
451 | ,exp))))) | |
452 | ||
453 | (define build-primref | |
454 | (lambda (src name) | |
a1a482e0 AW |
455 | (if (equal? (module-name (current-module)) '(guile)) |
456 | (case (fluid-ref *mode*) | |
457 | ((c) ((@ (language tree-il) make-toplevel-ref) src name)) | |
458 | (else name)) | |
459 | (case (fluid-ref *mode*) | |
460 | ((c) ((@ (language tree-il) make-module-ref) src '(guile) name #f)) | |
461 | (else `(@@ (guile) ,name)))))) | |
a63812a2 | 462 | |
80f225df | 463 | (define (build-data src exp) |
811d10f5 AW |
464 | (case (fluid-ref *mode*) |
465 | ((c) ((@ (language tree-il) make-const) src exp)) | |
466 | (else (if (and (self-evaluating? exp) (not (vector? exp))) | |
467 | exp | |
468 | (list 'quote exp))))) | |
a63812a2 JB |
469 | |
470 | (define build-sequence | |
471 | (lambda (src exps) | |
472 | (if (null? (cdr exps)) | |
811d10f5 AW |
473 | (car exps) |
474 | (case (fluid-ref *mode*) | |
475 | ((c) ((@ (language tree-il) make-sequence) src exps)) | |
476 | (else `(begin ,@exps)))))) | |
a63812a2 JB |
477 | |
478 | (define build-let | |
547a602d | 479 | (lambda (src ids vars val-exps body-exp) |
a63812a2 | 480 | (if (null? vars) |
811d10f5 AW |
481 | body-exp |
482 | (case (fluid-ref *mode*) | |
dc1eed52 AW |
483 | ((c) |
484 | (for-each maybe-name-value! ids val-exps) | |
485 | ((@ (language tree-il) make-let) src ids vars val-exps body-exp)) | |
811d10f5 | 486 | (else `(let ,(map list vars val-exps) ,body-exp)))))) |
a63812a2 JB |
487 | |
488 | (define build-named-let | |
547a602d | 489 | (lambda (src ids vars val-exps body-exp) |
811d10f5 | 490 | (let ((f (car vars)) |
547a602d AW |
491 | (f-name (car ids)) |
492 | (vars (cdr vars)) | |
493 | (ids (cdr ids))) | |
811d10f5 | 494 | (case (fluid-ref *mode*) |
dc1eed52 AW |
495 | ((c) |
496 | (let ((proc (build-lambda src ids vars #f body-exp))) | |
497 | (maybe-name-value! f-name proc) | |
498 | (for-each maybe-name-value! ids val-exps) | |
499 | ((@ (language tree-il) make-letrec) src | |
500 | (list f-name) (list f) (list proc) | |
501 | (build-application src (build-lexical-reference 'fun src f-name f) | |
502 | val-exps)))) | |
811d10f5 | 503 | (else `(let ,f ,(map list vars val-exps) ,body-exp)))))) |
a63812a2 JB |
504 | |
505 | (define build-letrec | |
547a602d | 506 | (lambda (src ids vars val-exps body-exp) |
a63812a2 | 507 | (if (null? vars) |
811d10f5 AW |
508 | body-exp |
509 | (case (fluid-ref *mode*) | |
dc1eed52 AW |
510 | ((c) |
511 | (for-each maybe-name-value! ids val-exps) | |
512 | ((@ (language tree-il) make-letrec) src ids vars val-exps body-exp)) | |
811d10f5 | 513 | (else `(letrec ,(map list vars val-exps) ,body-exp)))))) |
a63812a2 | 514 | |
811d10f5 | 515 | ;; FIXME: wingo: use make-lexical ? |
a63812a2 JB |
516 | (define-syntax build-lexical-var |
517 | (syntax-rules () | |
811d10f5 | 518 | ((_ src id) (gensym (symbol->string id))))) |
a63812a2 | 519 | |
e02e84de | 520 | (define-structure (syntax-object expression wrap module)) |
a63812a2 | 521 | |
a63812a2 JB |
522 | (define-syntax no-source (identifier-syntax #f)) |
523 | ||
524 | (define source-annotation | |
525 | (lambda (x) | |
526 | (cond | |
b40d0230 AW |
527 | ((syntax-object? x) |
528 | (source-annotation (syntax-object-expression x))) | |
0e7b72a8 AW |
529 | ((pair? x) (let ((props (source-properties x))) |
530 | (if (pair? props) | |
531 | props | |
532 | #f))) | |
b40d0230 | 533 | (else #f)))) |
a63812a2 JB |
534 | |
535 | (define-syntax arg-check | |
536 | (syntax-rules () | |
537 | ((_ pred? e who) | |
538 | (let ((x e)) | |
6a952e0e | 539 | (if (not (pred? x)) (syntax-violation who "invalid argument" x)))))) |
a63812a2 JB |
540 | |
541 | ;;; compile-time environments | |
542 | ||
543 | ;;; wrap and environment comprise two level mapping. | |
544 | ;;; wrap : id --> label | |
545 | ;;; env : label --> <element> | |
546 | ||
547 | ;;; environments are represented in two parts: a lexical part and a global | |
548 | ;;; part. The lexical part is a simple list of associations from labels | |
549 | ;;; to bindings. The global part is implemented by | |
550 | ;;; {put,get}-global-definition-hook and associates symbols with | |
551 | ;;; bindings. | |
552 | ||
553 | ;;; global (assumed global variable) and displaced-lexical (see below) | |
554 | ;;; do not show up in any environment; instead, they are fabricated by | |
555 | ;;; lookup when it finds no other bindings. | |
556 | ||
557 | ;;; <environment> ::= ((<label> . <binding>)*) | |
558 | ||
559 | ;;; identifier bindings include a type and a value | |
560 | ||
561 | ;;; <binding> ::= (macro . <procedure>) macros | |
562 | ;;; (core . <procedure>) core forms | |
80f225df | 563 | ;;; (external-macro . <procedure>) external-macro |
265e6127 | 564 | ;;; (module-ref . <procedure>) @ or @@ |
a63812a2 JB |
565 | ;;; (begin) begin |
566 | ;;; (define) define | |
567 | ;;; (define-syntax) define-syntax | |
568 | ;;; (local-syntax . rec?) let-syntax/letrec-syntax | |
569 | ;;; (eval-when) eval-when | |
570 | ;;; (syntax . (<var> . <level>)) pattern variables | |
571 | ;;; (global) assumed global variable | |
572 | ;;; (lexical . <var>) lexical variables | |
573 | ;;; (displaced-lexical) displaced lexicals | |
574 | ;;; <level> ::= <nonnegative integer> | |
575 | ;;; <var> ::= variable returned by build-lexical-var | |
576 | ||
577 | ;;; a macro is a user-defined syntactic-form. a core is a system-defined | |
578 | ;;; syntactic form. begin, define, define-syntax, and eval-when are | |
579 | ;;; treated specially since they are sensitive to whether the form is | |
580 | ;;; at top-level and (except for eval-when) can denote valid internal | |
581 | ;;; definitions. | |
582 | ||
583 | ;;; a pattern variable is a variable introduced by syntax-case and can | |
584 | ;;; be referenced only within a syntax form. | |
585 | ||
586 | ;;; any identifier for which no top-level syntax definition or local | |
587 | ;;; binding of any kind has been seen is assumed to be a global | |
588 | ;;; variable. | |
589 | ||
590 | ;;; a lexical variable is a lambda- or letrec-bound variable. | |
591 | ||
592 | ;;; a displaced-lexical identifier is a lexical identifier removed from | |
593 | ;;; it's scope by the return of a syntax object containing the identifier. | |
594 | ;;; a displaced lexical can also appear when a letrec-syntax-bound | |
595 | ;;; keyword is referenced on the rhs of one of the letrec-syntax clauses. | |
596 | ;;; a displaced lexical should never occur with properly written macros. | |
597 | ||
598 | (define-syntax make-binding | |
599 | (syntax-rules (quote) | |
600 | ((_ type value) (cons type value)) | |
601 | ((_ 'type) '(type)) | |
602 | ((_ type) (cons type '())))) | |
603 | (define binding-type car) | |
604 | (define binding-value cdr) | |
605 | ||
606 | (define-syntax null-env (identifier-syntax '())) | |
607 | ||
608 | (define extend-env | |
609 | (lambda (labels bindings r) | |
610 | (if (null? labels) | |
611 | r | |
612 | (extend-env (cdr labels) (cdr bindings) | |
613 | (cons (cons (car labels) (car bindings)) r))))) | |
614 | ||
615 | (define extend-var-env | |
616 | ; variant of extend-env that forms "lexical" binding | |
617 | (lambda (labels vars r) | |
618 | (if (null? labels) | |
619 | r | |
620 | (extend-var-env (cdr labels) (cdr vars) | |
621 | (cons (cons (car labels) (make-binding 'lexical (car vars))) r))))) | |
622 | ||
623 | ;;; we use a "macros only" environment in expansion of local macro | |
624 | ;;; definitions so that their definitions can use local macros without | |
625 | ;;; attempting to use other lexical identifiers. | |
626 | (define macros-only-env | |
627 | (lambda (r) | |
628 | (if (null? r) | |
629 | '() | |
630 | (let ((a (car r))) | |
631 | (if (eq? (cadr a) 'macro) | |
632 | (cons a (macros-only-env (cdr r))) | |
633 | (macros-only-env (cdr r))))))) | |
634 | ||
635 | (define lookup | |
636 | ; x may be a label or a symbol | |
637 | ; although symbols are usually global, we check the environment first | |
638 | ; anyway because a temporary binding may have been established by | |
639 | ; fluid-let-syntax | |
8e1d0d50 | 640 | (lambda (x r mod) |
a63812a2 JB |
641 | (cond |
642 | ((assq x r) => cdr) | |
643 | ((symbol? x) | |
8e1d0d50 | 644 | (or (get-global-definition-hook x mod) (make-binding 'global))) |
a63812a2 JB |
645 | (else (make-binding 'displaced-lexical))))) |
646 | ||
647 | (define global-extend | |
648 | (lambda (type sym val) | |
97ce9dbf | 649 | (put-global-definition-hook sym type val))) |
a63812a2 JB |
650 | |
651 | ||
652 | ;;; Conceptually, identifiers are always syntax objects. Internally, | |
653 | ;;; however, the wrap is sometimes maintained separately (a source of | |
654 | ;;; efficiency and confusion), so that symbols are also considered | |
655 | ;;; identifiers by id?. Externally, they are always wrapped. | |
656 | ||
657 | (define nonsymbol-id? | |
658 | (lambda (x) | |
659 | (and (syntax-object? x) | |
b40d0230 | 660 | (symbol? (syntax-object-expression x))))) |
a63812a2 JB |
661 | |
662 | (define id? | |
663 | (lambda (x) | |
664 | (cond | |
665 | ((symbol? x) #t) | |
b40d0230 | 666 | ((syntax-object? x) (symbol? (syntax-object-expression x))) |
a63812a2 JB |
667 | (else #f)))) |
668 | ||
669 | (define-syntax id-sym-name | |
670 | (syntax-rules () | |
671 | ((_ e) | |
672 | (let ((x e)) | |
b40d0230 AW |
673 | (if (syntax-object? x) |
674 | (syntax-object-expression x) | |
675 | x))))) | |
a63812a2 JB |
676 | |
677 | (define id-sym-name&marks | |
678 | (lambda (x w) | |
679 | (if (syntax-object? x) | |
680 | (values | |
b40d0230 AW |
681 | (syntax-object-expression x) |
682 | (join-marks (wrap-marks w) (wrap-marks (syntax-object-wrap x)))) | |
683 | (values x (wrap-marks w))))) | |
a63812a2 JB |
684 | |
685 | ;;; syntax object wraps | |
686 | ||
687 | ;;; <wrap> ::= ((<mark> ...) . (<subst> ...)) | |
688 | ;;; <subst> ::= <shift> | <subs> | |
689 | ;;; <subs> ::= #(<old name> <label> (<mark> ...)) | |
690 | ;;; <shift> ::= positive fixnum | |
691 | ||
692 | (define make-wrap cons) | |
693 | (define wrap-marks car) | |
694 | (define wrap-subst cdr) | |
695 | ||
696 | (define-syntax subst-rename? (identifier-syntax vector?)) | |
697 | (define-syntax rename-old (syntax-rules () ((_ x) (vector-ref x 0)))) | |
698 | (define-syntax rename-new (syntax-rules () ((_ x) (vector-ref x 1)))) | |
699 | (define-syntax rename-marks (syntax-rules () ((_ x) (vector-ref x 2)))) | |
700 | (define-syntax make-rename | |
701 | (syntax-rules () | |
702 | ((_ old new marks) (vector old new marks)))) | |
703 | ||
704 | ;;; labels must be comparable with "eq?" and distinct from symbols. | |
705 | (define gen-label | |
706 | (lambda () (string #\i))) | |
707 | ||
708 | (define gen-labels | |
709 | (lambda (ls) | |
710 | (if (null? ls) | |
711 | '() | |
712 | (cons (gen-label) (gen-labels (cdr ls)))))) | |
713 | ||
714 | (define-structure (ribcage symnames marks labels)) | |
715 | ||
716 | (define-syntax empty-wrap (identifier-syntax '(()))) | |
717 | ||
718 | (define-syntax top-wrap (identifier-syntax '((top)))) | |
719 | ||
720 | (define-syntax top-marked? | |
721 | (syntax-rules () | |
722 | ((_ w) (memq 'top (wrap-marks w))))) | |
723 | ||
724 | ;;; Marks must be comparable with "eq?" and distinct from pairs and | |
725 | ;;; the symbol top. We do not use integers so that marks will remain | |
726 | ;;; unique even across file compiles. | |
727 | ||
728 | (define-syntax the-anti-mark (identifier-syntax #f)) | |
729 | ||
730 | (define anti-mark | |
731 | (lambda (w) | |
732 | (make-wrap (cons the-anti-mark (wrap-marks w)) | |
733 | (cons 'shift (wrap-subst w))))) | |
734 | ||
735 | (define-syntax new-mark | |
736 | (syntax-rules () | |
737 | ((_) (string #\m)))) | |
738 | ||
739 | ;;; make-empty-ribcage and extend-ribcage maintain list-based ribcages for | |
740 | ;;; internal definitions, in which the ribcages are built incrementally | |
741 | (define-syntax make-empty-ribcage | |
742 | (syntax-rules () | |
743 | ((_) (make-ribcage '() '() '())))) | |
744 | ||
745 | (define extend-ribcage! | |
746 | ; must receive ids with complete wraps | |
747 | (lambda (ribcage id label) | |
748 | (set-ribcage-symnames! ribcage | |
b40d0230 | 749 | (cons (syntax-object-expression id) |
a63812a2 JB |
750 | (ribcage-symnames ribcage))) |
751 | (set-ribcage-marks! ribcage | |
752 | (cons (wrap-marks (syntax-object-wrap id)) | |
753 | (ribcage-marks ribcage))) | |
754 | (set-ribcage-labels! ribcage | |
755 | (cons label (ribcage-labels ribcage))))) | |
756 | ||
757 | ;;; make-binding-wrap creates vector-based ribcages | |
758 | (define make-binding-wrap | |
759 | (lambda (ids labels w) | |
760 | (if (null? ids) | |
761 | w | |
762 | (make-wrap | |
763 | (wrap-marks w) | |
764 | (cons | |
765 | (let ((labelvec (list->vector labels))) | |
766 | (let ((n (vector-length labelvec))) | |
767 | (let ((symnamevec (make-vector n)) (marksvec (make-vector n))) | |
768 | (let f ((ids ids) (i 0)) | |
769 | (if (not (null? ids)) | |
770 | (call-with-values | |
771 | (lambda () (id-sym-name&marks (car ids) w)) | |
772 | (lambda (symname marks) | |
773 | (vector-set! symnamevec i symname) | |
774 | (vector-set! marksvec i marks) | |
775 | (f (cdr ids) (fx+ i 1)))))) | |
776 | (make-ribcage symnamevec marksvec labelvec)))) | |
777 | (wrap-subst w)))))) | |
778 | ||
779 | (define smart-append | |
780 | (lambda (m1 m2) | |
781 | (if (null? m2) | |
782 | m1 | |
783 | (append m1 m2)))) | |
784 | ||
785 | (define join-wraps | |
786 | (lambda (w1 w2) | |
787 | (let ((m1 (wrap-marks w1)) (s1 (wrap-subst w1))) | |
788 | (if (null? m1) | |
789 | (if (null? s1) | |
790 | w2 | |
791 | (make-wrap | |
792 | (wrap-marks w2) | |
793 | (smart-append s1 (wrap-subst w2)))) | |
794 | (make-wrap | |
795 | (smart-append m1 (wrap-marks w2)) | |
796 | (smart-append s1 (wrap-subst w2))))))) | |
797 | ||
798 | (define join-marks | |
799 | (lambda (m1 m2) | |
800 | (smart-append m1 m2))) | |
801 | ||
802 | (define same-marks? | |
803 | (lambda (x y) | |
804 | (or (eq? x y) | |
805 | (and (not (null? x)) | |
806 | (not (null? y)) | |
807 | (eq? (car x) (car y)) | |
808 | (same-marks? (cdr x) (cdr y)))))) | |
809 | ||
810 | (define id-var-name | |
811 | (lambda (id w) | |
812 | (define-syntax first | |
813 | (syntax-rules () | |
814 | ((_ e) (call-with-values (lambda () e) (lambda (x . ignore) x))))) | |
815 | (define search | |
816 | (lambda (sym subst marks) | |
817 | (if (null? subst) | |
818 | (values #f marks) | |
819 | (let ((fst (car subst))) | |
820 | (if (eq? fst 'shift) | |
821 | (search sym (cdr subst) (cdr marks)) | |
822 | (let ((symnames (ribcage-symnames fst))) | |
823 | (if (vector? symnames) | |
824 | (search-vector-rib sym subst marks symnames fst) | |
825 | (search-list-rib sym subst marks symnames fst)))))))) | |
826 | (define search-list-rib | |
827 | (lambda (sym subst marks symnames ribcage) | |
828 | (let f ((symnames symnames) (i 0)) | |
829 | (cond | |
830 | ((null? symnames) (search sym (cdr subst) marks)) | |
831 | ((and (eq? (car symnames) sym) | |
832 | (same-marks? marks (list-ref (ribcage-marks ribcage) i))) | |
833 | (values (list-ref (ribcage-labels ribcage) i) marks)) | |
834 | (else (f (cdr symnames) (fx+ i 1))))))) | |
835 | (define search-vector-rib | |
836 | (lambda (sym subst marks symnames ribcage) | |
837 | (let ((n (vector-length symnames))) | |
838 | (let f ((i 0)) | |
839 | (cond | |
840 | ((fx= i n) (search sym (cdr subst) marks)) | |
841 | ((and (eq? (vector-ref symnames i) sym) | |
842 | (same-marks? marks (vector-ref (ribcage-marks ribcage) i))) | |
843 | (values (vector-ref (ribcage-labels ribcage) i) marks)) | |
844 | (else (f (fx+ i 1)))))))) | |
845 | (cond | |
846 | ((symbol? id) | |
847 | (or (first (search id (wrap-subst w) (wrap-marks w))) id)) | |
848 | ((syntax-object? id) | |
b40d0230 | 849 | (let ((id (syntax-object-expression id)) |
a63812a2 JB |
850 | (w1 (syntax-object-wrap id))) |
851 | (let ((marks (join-marks (wrap-marks w) (wrap-marks w1)))) | |
852 | (call-with-values (lambda () (search id (wrap-subst w) marks)) | |
853 | (lambda (new-id marks) | |
854 | (or new-id | |
855 | (first (search id (wrap-subst w1) marks)) | |
856 | id)))))) | |
6a952e0e | 857 | (else (syntax-violation 'id-var-name "invalid id" id))))) |
a63812a2 JB |
858 | |
859 | ;;; free-id=? must be passed fully wrapped ids since (free-id=? x y) | |
860 | ;;; may be true even if (free-id=? (wrap x w) (wrap y w)) is not. | |
861 | ||
862 | (define free-id=? | |
863 | (lambda (i j) | |
864 | (and (eq? (id-sym-name i) (id-sym-name j)) ; accelerator | |
865 | (eq? (id-var-name i empty-wrap) (id-var-name j empty-wrap))))) | |
866 | ||
867 | ;;; bound-id=? may be passed unwrapped (or partially wrapped) ids as | |
868 | ;;; long as the missing portion of the wrap is common to both of the ids | |
869 | ;;; since (bound-id=? x y) iff (bound-id=? (wrap x w) (wrap y w)) | |
870 | ||
871 | (define bound-id=? | |
872 | (lambda (i j) | |
873 | (if (and (syntax-object? i) (syntax-object? j)) | |
b40d0230 AW |
874 | (and (eq? (syntax-object-expression i) |
875 | (syntax-object-expression j)) | |
a63812a2 JB |
876 | (same-marks? (wrap-marks (syntax-object-wrap i)) |
877 | (wrap-marks (syntax-object-wrap j)))) | |
b40d0230 | 878 | (eq? i j)))) |
a63812a2 JB |
879 | |
880 | ;;; "valid-bound-ids?" returns #t if it receives a list of distinct ids. | |
881 | ;;; valid-bound-ids? may be passed unwrapped (or partially wrapped) ids | |
882 | ;;; as long as the missing portion of the wrap is common to all of the | |
883 | ;;; ids. | |
884 | ||
885 | (define valid-bound-ids? | |
886 | (lambda (ids) | |
887 | (and (let all-ids? ((ids ids)) | |
888 | (or (null? ids) | |
889 | (and (id? (car ids)) | |
890 | (all-ids? (cdr ids))))) | |
891 | (distinct-bound-ids? ids)))) | |
892 | ||
893 | ;;; distinct-bound-ids? expects a list of ids and returns #t if there are | |
894 | ;;; no duplicates. It is quadratic on the length of the id list; long | |
895 | ;;; lists could be sorted to make it more efficient. distinct-bound-ids? | |
896 | ;;; may be passed unwrapped (or partially wrapped) ids as long as the | |
897 | ;;; missing portion of the wrap is common to all of the ids. | |
898 | ||
899 | (define distinct-bound-ids? | |
900 | (lambda (ids) | |
901 | (let distinct? ((ids ids)) | |
902 | (or (null? ids) | |
903 | (and (not (bound-id-member? (car ids) (cdr ids))) | |
904 | (distinct? (cdr ids))))))) | |
905 | ||
906 | (define bound-id-member? | |
907 | (lambda (x list) | |
908 | (and (not (null? list)) | |
909 | (or (bound-id=? x (car list)) | |
910 | (bound-id-member? x (cdr list)))))) | |
911 | ||
912 | ;;; wrapping expressions and identifiers | |
913 | ||
914 | (define wrap | |
4e237f14 | 915 | (lambda (x w defmod) |
a63812a2 JB |
916 | (cond |
917 | ((and (null? (wrap-marks w)) (null? (wrap-subst w))) x) | |
918 | ((syntax-object? x) | |
919 | (make-syntax-object | |
920 | (syntax-object-expression x) | |
e02e84de AW |
921 | (join-wraps w (syntax-object-wrap x)) |
922 | (syntax-object-module x))) | |
a63812a2 | 923 | ((null? x) x) |
4e237f14 | 924 | (else (make-syntax-object x w defmod))))) |
a63812a2 JB |
925 | |
926 | (define source-wrap | |
4e237f14 | 927 | (lambda (x w s defmod) |
0e7b72a8 AW |
928 | (if (and s (pair? x)) |
929 | (set-source-properties! x s)) | |
930 | (wrap x w defmod))) | |
a63812a2 JB |
931 | |
932 | ;;; expanding | |
933 | ||
934 | (define chi-sequence | |
4e237f14 | 935 | (lambda (body r w s mod) |
a63812a2 | 936 | (build-sequence s |
4e237f14 | 937 | (let dobody ((body body) (r r) (w w) (mod mod)) |
a63812a2 JB |
938 | (if (null? body) |
939 | '() | |
4e237f14 AW |
940 | (let ((first (chi (car body) r w mod))) |
941 | (cons first (dobody (cdr body) r w mod)))))))) | |
a63812a2 JB |
942 | |
943 | (define chi-top-sequence | |
4e237f14 | 944 | (lambda (body r w s m esew mod) |
a63812a2 | 945 | (build-sequence s |
4e237f14 | 946 | (let dobody ((body body) (r r) (w w) (m m) (esew esew) (mod mod)) |
a63812a2 JB |
947 | (if (null? body) |
948 | '() | |
4e237f14 AW |
949 | (let ((first (chi-top (car body) r w m esew mod))) |
950 | (cons first (dobody (cdr body) r w m esew mod)))))))) | |
a63812a2 JB |
951 | |
952 | (define chi-install-global | |
953 | (lambda (name e) | |
f27e9e11 AW |
954 | (build-global-definition |
955 | no-source | |
956 | name | |
957 | ;; FIXME: seems nasty to call current-module here | |
958 | (if (let ((v (module-variable (current-module) name))) | |
959 | ;; FIXME use primitive-macro? | |
960 | (and v (variable-bound? v) (macro? (variable-ref v)) | |
961 | (not (eq? (macro-type (variable-ref v)) 'syncase-macro)))) | |
962 | (build-application | |
963 | no-source | |
964 | (build-primref no-source 'make-extended-syncase-macro) | |
965 | (list (build-application | |
966 | no-source | |
967 | (build-primref no-source 'module-ref) | |
e32a1792 AW |
968 | (list (build-application |
969 | no-source | |
970 | (build-primref no-source 'current-module) | |
971 | '()) | |
f27e9e11 AW |
972 | (build-data no-source name))) |
973 | (build-data no-source 'macro) | |
974 | e)) | |
975 | (build-application | |
976 | no-source | |
977 | (build-primref no-source 'make-syncase-macro) | |
978 | (list (build-data no-source 'macro) e)))))) | |
a63812a2 JB |
979 | |
980 | (define chi-when-list | |
981 | (lambda (e when-list w) | |
982 | ; when-list is syntax'd version of list of situations | |
983 | (let f ((when-list when-list) (situations '())) | |
984 | (if (null? when-list) | |
985 | situations | |
986 | (f (cdr when-list) | |
987 | (cons (let ((x (car when-list))) | |
988 | (cond | |
989 | ((free-id=? x (syntax compile)) 'compile) | |
990 | ((free-id=? x (syntax load)) 'load) | |
991 | ((free-id=? x (syntax eval)) 'eval) | |
e4721dde AW |
992 | (else (syntax-violation 'eval-when |
993 | "invalid situation" | |
994 | e (wrap x w #f))))) | |
a63812a2 JB |
995 | situations)))))) |
996 | ||
4e237f14 AW |
997 | ;;; syntax-type returns six values: type, value, e, w, s, and mod. The |
998 | ;;; first two are described in the table below. | |
a63812a2 JB |
999 | ;;; |
1000 | ;;; type value explanation | |
1001 | ;;; ------------------------------------------------------------------- | |
1002 | ;;; core procedure core form (including singleton) | |
80f225df | 1003 | ;;; external-macro procedure external macro |
265e6127 | 1004 | ;;; module-ref procedure @ or @@ form |
a63812a2 JB |
1005 | ;;; lexical name lexical variable reference |
1006 | ;;; global name global variable reference | |
1007 | ;;; begin none begin keyword | |
1008 | ;;; define none define keyword | |
1009 | ;;; define-syntax none define-syntax keyword | |
1010 | ;;; local-syntax rec? letrec-syntax/let-syntax keyword | |
1011 | ;;; eval-when none eval-when keyword | |
1012 | ;;; syntax level pattern variable | |
1013 | ;;; displaced-lexical none displaced lexical identifier | |
1014 | ;;; lexical-call name call to lexical variable | |
1015 | ;;; global-call name call to global variable | |
1016 | ;;; call none any other call | |
1017 | ;;; begin-form none begin expression | |
1018 | ;;; define-form id variable definition | |
1019 | ;;; define-syntax-form id syntax definition | |
1020 | ;;; local-syntax-form rec? syntax definition | |
1021 | ;;; eval-when-form none eval-when form | |
1022 | ;;; constant none self-evaluating datum | |
1023 | ;;; other none anything else | |
1024 | ;;; | |
1025 | ;;; For define-form and define-syntax-form, e is the rhs expression. | |
1026 | ;;; For all others, e is the entire form. w is the wrap for e. | |
4e237f14 | 1027 | ;;; s is the source for the entire form. mod is the module for e. |
a63812a2 JB |
1028 | ;;; |
1029 | ;;; syntax-type expands macros and unwraps as necessary to get to | |
1030 | ;;; one of the forms above. It also parses define and define-syntax | |
1031 | ;;; forms, although perhaps this should be done by the consumer. | |
1032 | ||
1033 | (define syntax-type | |
4e237f14 | 1034 | (lambda (e r w s rib mod) |
a63812a2 JB |
1035 | (cond |
1036 | ((symbol? e) | |
1037 | (let* ((n (id-var-name e w)) | |
8e1d0d50 | 1038 | (b (lookup n r mod)) |
a63812a2 JB |
1039 | (type (binding-type b))) |
1040 | (case type | |
8e1d0d50 | 1041 | ((lexical) (values type (binding-value b) e w s mod)) |
4e237f14 | 1042 | ((global) (values type n e w s mod)) |
a63812a2 | 1043 | ((macro) |
4e237f14 AW |
1044 | (syntax-type (chi-macro (binding-value b) e r w rib mod) |
1045 | r empty-wrap s rib mod)) | |
1046 | (else (values type (binding-value b) e w s mod))))) | |
a63812a2 JB |
1047 | ((pair? e) |
1048 | (let ((first (car e))) | |
1049 | (if (id? first) | |
1050 | (let* ((n (id-var-name first w)) | |
c5cc65ac AW |
1051 | (b (lookup n r (or (and (syntax-object? first) |
1052 | (syntax-object-module first)) | |
1053 | mod))) | |
a63812a2 JB |
1054 | (type (binding-type b))) |
1055 | (case type | |
4e237f14 AW |
1056 | ((lexical) |
1057 | (values 'lexical-call (binding-value b) e w s mod)) | |
1058 | ((global) | |
1059 | (values 'global-call n e w s mod)) | |
a63812a2 | 1060 | ((macro) |
4e237f14 AW |
1061 | (syntax-type (chi-macro (binding-value b) e r w rib mod) |
1062 | r empty-wrap s rib mod)) | |
265e6127 | 1063 | ((core external-macro module-ref) |
4e237f14 | 1064 | (values type (binding-value b) e w s mod)) |
a63812a2 | 1065 | ((local-syntax) |
4e237f14 AW |
1066 | (values 'local-syntax-form (binding-value b) e w s mod)) |
1067 | ((begin) | |
1068 | (values 'begin-form #f e w s mod)) | |
1069 | ((eval-when) | |
1070 | (values 'eval-when-form #f e w s mod)) | |
a63812a2 JB |
1071 | ((define) |
1072 | (syntax-case e () | |
1073 | ((_ name val) | |
1074 | (id? (syntax name)) | |
4e237f14 | 1075 | (values 'define-form (syntax name) (syntax val) w s mod)) |
a63812a2 JB |
1076 | ((_ (name . args) e1 e2 ...) |
1077 | (and (id? (syntax name)) | |
1078 | (valid-bound-ids? (lambda-var-list (syntax args)))) | |
1079 | ; need lambda here... | |
8e1d0d50 | 1080 | (values 'define-form (wrap (syntax name) w mod) |
4e237f14 AW |
1081 | (cons (syntax lambda) (wrap (syntax (args e1 e2 ...)) w mod)) |
1082 | empty-wrap s mod)) | |
a63812a2 JB |
1083 | ((_ name) |
1084 | (id? (syntax name)) | |
8e1d0d50 | 1085 | (values 'define-form (wrap (syntax name) w mod) |
41af2381 | 1086 | (syntax (if #f #f)) |
4e237f14 | 1087 | empty-wrap s mod)))) |
a63812a2 JB |
1088 | ((define-syntax) |
1089 | (syntax-case e () | |
1090 | ((_ name val) | |
1091 | (id? (syntax name)) | |
1092 | (values 'define-syntax-form (syntax name) | |
4e237f14 AW |
1093 | (syntax val) w s mod)))) |
1094 | (else | |
1095 | (values 'call #f e w s mod)))) | |
1096 | (values 'call #f e w s mod)))) | |
a63812a2 | 1097 | ((syntax-object? e) |
a63812a2 JB |
1098 | (syntax-type (syntax-object-expression e) |
1099 | r | |
1100 | (join-wraps w (syntax-object-wrap e)) | |
0e7b72a8 | 1101 | s rib (or (syntax-object-module e) mod))) |
4e237f14 AW |
1102 | ((self-evaluating? e) (values 'constant #f e w s mod)) |
1103 | (else (values 'other #f e w s mod))))) | |
a63812a2 JB |
1104 | |
1105 | (define chi-top | |
4e237f14 | 1106 | (lambda (e r w m esew mod) |
a63812a2 JB |
1107 | (define-syntax eval-if-c&e |
1108 | (syntax-rules () | |
4e237f14 | 1109 | ((_ m e mod) |
a63812a2 | 1110 | (let ((x e)) |
4e237f14 | 1111 | (if (eq? m 'c&e) (top-level-eval-hook x mod)) |
a63812a2 JB |
1112 | x)))) |
1113 | (call-with-values | |
b40d0230 | 1114 | (lambda () (syntax-type e r w (source-annotation e) #f mod)) |
4e237f14 | 1115 | (lambda (type value e w s mod) |
a63812a2 JB |
1116 | (case type |
1117 | ((begin-form) | |
1118 | (syntax-case e () | |
1119 | ((_) (chi-void)) | |
1120 | ((_ e1 e2 ...) | |
4e237f14 | 1121 | (chi-top-sequence (syntax (e1 e2 ...)) r w s m esew mod)))) |
a63812a2 | 1122 | ((local-syntax-form) |
4e237f14 AW |
1123 | (chi-local-syntax value e r w s mod |
1124 | (lambda (body r w s mod) | |
1125 | (chi-top-sequence body r w s m esew mod)))) | |
a63812a2 JB |
1126 | ((eval-when-form) |
1127 | (syntax-case e () | |
1128 | ((_ (x ...) e1 e2 ...) | |
1129 | (let ((when-list (chi-when-list e (syntax (x ...)) w)) | |
1130 | (body (syntax (e1 e2 ...)))) | |
1131 | (cond | |
1132 | ((eq? m 'e) | |
1133 | (if (memq 'eval when-list) | |
4e237f14 | 1134 | (chi-top-sequence body r w s 'e '(eval) mod) |
a63812a2 JB |
1135 | (chi-void))) |
1136 | ((memq 'load when-list) | |
1137 | (if (or (memq 'compile when-list) | |
1138 | (and (eq? m 'c&e) (memq 'eval when-list))) | |
4e237f14 | 1139 | (chi-top-sequence body r w s 'c&e '(compile load) mod) |
a63812a2 | 1140 | (if (memq m '(c c&e)) |
4e237f14 | 1141 | (chi-top-sequence body r w s 'c '(load) mod) |
a63812a2 JB |
1142 | (chi-void)))) |
1143 | ((or (memq 'compile when-list) | |
1144 | (and (eq? m 'c&e) (memq 'eval when-list))) | |
1145 | (top-level-eval-hook | |
4e237f14 AW |
1146 | (chi-top-sequence body r w s 'e '(eval) mod) |
1147 | mod) | |
a63812a2 JB |
1148 | (chi-void)) |
1149 | (else (chi-void))))))) | |
1150 | ((define-syntax-form) | |
1151 | (let ((n (id-var-name value w)) (r (macros-only-env r))) | |
1152 | (case m | |
1153 | ((c) | |
1154 | (if (memq 'compile esew) | |
4e237f14 AW |
1155 | (let ((e (chi-install-global n (chi e r w mod)))) |
1156 | (top-level-eval-hook e mod) | |
a63812a2 JB |
1157 | (if (memq 'load esew) e (chi-void))) |
1158 | (if (memq 'load esew) | |
4e237f14 | 1159 | (chi-install-global n (chi e r w mod)) |
a63812a2 JB |
1160 | (chi-void)))) |
1161 | ((c&e) | |
4e237f14 AW |
1162 | (let ((e (chi-install-global n (chi e r w mod)))) |
1163 | (top-level-eval-hook e mod) | |
a63812a2 JB |
1164 | e)) |
1165 | (else | |
1166 | (if (memq 'eval esew) | |
1167 | (top-level-eval-hook | |
4e237f14 AW |
1168 | (chi-install-global n (chi e r w mod)) |
1169 | mod)) | |
a63812a2 JB |
1170 | (chi-void))))) |
1171 | ((define-form) | |
80f225df | 1172 | (let* ((n (id-var-name value w)) |
8e1d0d50 | 1173 | (type (binding-type (lookup n r mod)))) |
80f225df | 1174 | (case type |
3d5f3091 | 1175 | ((global core macro module-ref) |
a63812a2 | 1176 | (eval-if-c&e m |
f27e9e11 | 1177 | (build-global-definition s n (chi e r w mod)) |
4e237f14 | 1178 | mod)) |
a63812a2 | 1179 | ((displaced-lexical) |
e4721dde AW |
1180 | (syntax-violation #f "identifier out of context" |
1181 | e (wrap value w mod))) | |
80f225df | 1182 | (else |
e4721dde AW |
1183 | (syntax-violation #f "cannot define keyword at top level" |
1184 | e (wrap value w mod)))))) | |
4e237f14 | 1185 | (else (eval-if-c&e m (chi-expr type value e r w s mod) mod))))))) |
a63812a2 JB |
1186 | |
1187 | (define chi | |
4e237f14 | 1188 | (lambda (e r w mod) |
a63812a2 | 1189 | (call-with-values |
b40d0230 | 1190 | (lambda () (syntax-type e r w (source-annotation e) #f mod)) |
4e237f14 AW |
1191 | (lambda (type value e w s mod) |
1192 | (chi-expr type value e r w s mod))))) | |
a63812a2 JB |
1193 | |
1194 | (define chi-expr | |
4e237f14 | 1195 | (lambda (type value e r w s mod) |
a63812a2 JB |
1196 | (case type |
1197 | ((lexical) | |
f4a644ee | 1198 | (build-lexical-reference 'value s e value)) |
4e237f14 AW |
1199 | ((core external-macro) |
1200 | ;; apply transformer | |
1201 | (value e r w s mod)) | |
265e6127 | 1202 | ((module-ref) |
dec62b5e | 1203 | (call-with-values (lambda () (value e)) |
265e6127 AW |
1204 | ;; we could add a public? arg here |
1205 | (lambda (id mod) (build-global-reference s id mod)))) | |
a63812a2 JB |
1206 | ((lexical-call) |
1207 | (chi-application | |
f4a644ee AW |
1208 | (build-lexical-reference 'fun (source-annotation (car e)) |
1209 | (car e) value) | |
4e237f14 | 1210 | e r w s mod)) |
a63812a2 JB |
1211 | ((global-call) |
1212 | (chi-application | |
d2b61fe0 AW |
1213 | (build-global-reference (source-annotation (car e)) value |
1214 | (if (syntax-object? (car e)) | |
1215 | (syntax-object-module (car e)) | |
1216 | mod)) | |
4e237f14 AW |
1217 | e r w s mod)) |
1218 | ((constant) (build-data s (strip (source-wrap e w s mod) empty-wrap))) | |
1219 | ((global) (build-global-reference s value mod)) | |
1220 | ((call) (chi-application (chi (car e) r w mod) e r w s mod)) | |
a63812a2 JB |
1221 | ((begin-form) |
1222 | (syntax-case e () | |
4e237f14 | 1223 | ((_ e1 e2 ...) (chi-sequence (syntax (e1 e2 ...)) r w s mod)))) |
a63812a2 | 1224 | ((local-syntax-form) |
4e237f14 | 1225 | (chi-local-syntax value e r w s mod chi-sequence)) |
a63812a2 JB |
1226 | ((eval-when-form) |
1227 | (syntax-case e () | |
1228 | ((_ (x ...) e1 e2 ...) | |
1229 | (let ((when-list (chi-when-list e (syntax (x ...)) w))) | |
1230 | (if (memq 'eval when-list) | |
4e237f14 | 1231 | (chi-sequence (syntax (e1 e2 ...)) r w s mod) |
a63812a2 JB |
1232 | (chi-void)))))) |
1233 | ((define-form define-syntax-form) | |
e4721dde AW |
1234 | (syntax-violation #f "definition in expression context" |
1235 | e (wrap value w mod))) | |
a63812a2 | 1236 | ((syntax) |
e4721dde AW |
1237 | (syntax-violation #f "reference to pattern variable outside syntax form" |
1238 | (source-wrap e w s mod))) | |
a63812a2 | 1239 | ((displaced-lexical) |
5a0132b3 AW |
1240 | (syntax-violation #f "reference to identifier outside its scope" |
1241 | (source-wrap e w s mod))) | |
e4721dde AW |
1242 | (else (syntax-violation #f "unexpected syntax" |
1243 | (source-wrap e w s mod)))))) | |
a63812a2 JB |
1244 | |
1245 | (define chi-application | |
4e237f14 | 1246 | (lambda (x e r w s mod) |
a63812a2 JB |
1247 | (syntax-case e () |
1248 | ((e0 e1 ...) | |
1249 | (build-application s x | |
4e237f14 | 1250 | (map (lambda (e) (chi e r w mod)) (syntax (e1 ...)))))))) |
a63812a2 JB |
1251 | |
1252 | (define chi-macro | |
4e237f14 | 1253 | (lambda (p e r w rib mod) |
a63812a2 JB |
1254 | (define rebuild-macro-output |
1255 | (lambda (x m) | |
1256 | (cond ((pair? x) | |
1257 | (cons (rebuild-macro-output (car x) m) | |
1258 | (rebuild-macro-output (cdr x) m))) | |
1259 | ((syntax-object? x) | |
1260 | (let ((w (syntax-object-wrap x))) | |
1261 | (let ((ms (wrap-marks w)) (s (wrap-subst w))) | |
4e237f14 AW |
1262 | (if (and (pair? ms) (eq? (car ms) the-anti-mark)) |
1263 | ;; output is from original text | |
1264 | (make-syntax-object | |
1265 | (syntax-object-expression x) | |
1266 | (make-wrap (cdr ms) (if rib (cons rib (cdr s)) (cdr s))) | |
1267 | (syntax-object-module x)) | |
1268 | ;; output introduced by macro | |
1269 | (make-syntax-object | |
1270 | (syntax-object-expression x) | |
1271 | (make-wrap (cons m ms) | |
1272 | (if rib | |
1273 | (cons rib (cons 'shift s)) | |
1274 | (cons 'shift s))) | |
34ad4f83 AW |
1275 | (let ((pmod (procedure-module p))) |
1276 | (if pmod | |
1277 | ;; hither the hygiene | |
1278 | (cons 'hygiene (module-name pmod)) | |
1279 | ;; but it's possible for the proc to have | |
1280 | ;; no mod, if it was made before modules | |
1281 | ;; were booted | |
1282 | '(hygiene guile)))))))) | |
a63812a2 JB |
1283 | ((vector? x) |
1284 | (let* ((n (vector-length x)) (v (make-vector n))) | |
1285 | (do ((i 0 (fx+ i 1))) | |
1286 | ((fx= i n) v) | |
1287 | (vector-set! v i | |
1288 | (rebuild-macro-output (vector-ref x i) m))))) | |
1289 | ((symbol? x) | |
e4721dde AW |
1290 | (syntax-violation #f "encountered raw symbol in macro output" |
1291 | (source-wrap e w s mod) x)) | |
a63812a2 | 1292 | (else x)))) |
4e237f14 | 1293 | (rebuild-macro-output (p (wrap e (anti-mark w) mod)) (new-mark)))) |
a63812a2 JB |
1294 | |
1295 | (define chi-body | |
1296 | ;; In processing the forms of the body, we create a new, empty wrap. | |
1297 | ;; This wrap is augmented (destructively) each time we discover that | |
1298 | ;; the next form is a definition. This is done: | |
1299 | ;; | |
1300 | ;; (1) to allow the first nondefinition form to be a call to | |
1301 | ;; one of the defined ids even if the id previously denoted a | |
1302 | ;; definition keyword or keyword for a macro expanding into a | |
1303 | ;; definition; | |
1304 | ;; (2) to prevent subsequent definition forms (but unfortunately | |
1305 | ;; not earlier ones) and the first nondefinition form from | |
1306 | ;; confusing one of the bound identifiers for an auxiliary | |
1307 | ;; keyword; and | |
1308 | ;; (3) so that we do not need to restart the expansion of the | |
1309 | ;; first nondefinition form, which is problematic anyway | |
1310 | ;; since it might be the first element of a begin that we | |
1311 | ;; have just spliced into the body (meaning if we restarted, | |
1312 | ;; we'd really need to restart with the begin or the macro | |
1313 | ;; call that expanded into the begin, and we'd have to give | |
1314 | ;; up allowing (begin <defn>+ <expr>+), which is itself | |
1315 | ;; problematic since we don't know if a begin contains only | |
1316 | ;; definitions until we've expanded it). | |
1317 | ;; | |
1318 | ;; Before processing the body, we also create a new environment | |
1319 | ;; containing a placeholder for the bindings we will add later and | |
1320 | ;; associate this environment with each form. In processing a | |
1321 | ;; let-syntax or letrec-syntax, the associated environment may be | |
1322 | ;; augmented with local keyword bindings, so the environment may | |
1323 | ;; be different for different forms in the body. Once we have | |
1324 | ;; gathered up all of the definitions, we evaluate the transformer | |
1325 | ;; expressions and splice into r at the placeholder the new variable | |
1326 | ;; and keyword bindings. This allows let-syntax or letrec-syntax | |
1327 | ;; forms local to a portion or all of the body to shadow the | |
1328 | ;; definition bindings. | |
1329 | ;; | |
1330 | ;; Subforms of a begin, let-syntax, or letrec-syntax are spliced | |
1331 | ;; into the body. | |
1332 | ;; | |
1333 | ;; outer-form is fully wrapped w/source | |
4e237f14 | 1334 | (lambda (body outer-form r w mod) |
a63812a2 JB |
1335 | (let* ((r (cons '("placeholder" . (placeholder)) r)) |
1336 | (ribcage (make-empty-ribcage)) | |
1337 | (w (make-wrap (wrap-marks w) (cons ribcage (wrap-subst w))))) | |
4e237f14 | 1338 | (let parse ((body (map (lambda (x) (cons r (wrap x w mod))) body)) |
39a2eca2 AW |
1339 | (ids '()) (labels '()) |
1340 | (var-ids '()) (vars '()) (vals '()) (bindings '())) | |
a63812a2 | 1341 | (if (null? body) |
e4721dde | 1342 | (syntax-violation #f "no expressions in body" outer-form) |
a63812a2 JB |
1343 | (let ((e (cdar body)) (er (caar body))) |
1344 | (call-with-values | |
0e7b72a8 | 1345 | (lambda () (syntax-type e er empty-wrap (source-annotation er) ribcage mod)) |
4e237f14 | 1346 | (lambda (type value e w s mod) |
a63812a2 JB |
1347 | (case type |
1348 | ((define-form) | |
4e237f14 | 1349 | (let ((id (wrap value w mod)) (label (gen-label))) |
a63812a2 JB |
1350 | (let ((var (gen-var id))) |
1351 | (extend-ribcage! ribcage id label) | |
1352 | (parse (cdr body) | |
1353 | (cons id ids) (cons label labels) | |
39a2eca2 | 1354 | (cons id var-ids) |
4e237f14 | 1355 | (cons var vars) (cons (cons er (wrap e w mod)) vals) |
a63812a2 JB |
1356 | (cons (make-binding 'lexical var) bindings))))) |
1357 | ((define-syntax-form) | |
4e237f14 | 1358 | (let ((id (wrap value w mod)) (label (gen-label))) |
a63812a2 JB |
1359 | (extend-ribcage! ribcage id label) |
1360 | (parse (cdr body) | |
1361 | (cons id ids) (cons label labels) | |
39a2eca2 | 1362 | var-ids vars vals |
4e237f14 | 1363 | (cons (make-binding 'macro (cons er (wrap e w mod))) |
a63812a2 JB |
1364 | bindings)))) |
1365 | ((begin-form) | |
1366 | (syntax-case e () | |
1367 | ((_ e1 ...) | |
1368 | (parse (let f ((forms (syntax (e1 ...)))) | |
1369 | (if (null? forms) | |
1370 | (cdr body) | |
4e237f14 | 1371 | (cons (cons er (wrap (car forms) w mod)) |
a63812a2 | 1372 | (f (cdr forms))))) |
39a2eca2 | 1373 | ids labels var-ids vars vals bindings)))) |
a63812a2 | 1374 | ((local-syntax-form) |
4e237f14 AW |
1375 | (chi-local-syntax value e er w s mod |
1376 | (lambda (forms er w s mod) | |
a63812a2 JB |
1377 | (parse (let f ((forms forms)) |
1378 | (if (null? forms) | |
1379 | (cdr body) | |
4e237f14 | 1380 | (cons (cons er (wrap (car forms) w mod)) |
a63812a2 | 1381 | (f (cdr forms))))) |
39a2eca2 | 1382 | ids labels var-ids vars vals bindings)))) |
a63812a2 JB |
1383 | (else ; found a non-definition |
1384 | (if (null? ids) | |
1385 | (build-sequence no-source | |
1386 | (map (lambda (x) | |
4e237f14 AW |
1387 | (chi (cdr x) (car x) empty-wrap mod)) |
1388 | (cons (cons er (source-wrap e w s mod)) | |
a63812a2 JB |
1389 | (cdr body)))) |
1390 | (begin | |
1391 | (if (not (valid-bound-ids? ids)) | |
e4721dde AW |
1392 | (syntax-violation |
1393 | #f "invalid or duplicate identifier in definition" | |
1394 | outer-form)) | |
a63812a2 JB |
1395 | (let loop ((bs bindings) (er-cache #f) (r-cache #f)) |
1396 | (if (not (null? bs)) | |
1397 | (let* ((b (car bs))) | |
1398 | (if (eq? (car b) 'macro) | |
1399 | (let* ((er (cadr b)) | |
1400 | (r-cache | |
1401 | (if (eq? er er-cache) | |
1402 | r-cache | |
1403 | (macros-only-env er)))) | |
1404 | (set-cdr! b | |
1405 | (eval-local-transformer | |
4e237f14 AW |
1406 | (chi (cddr b) r-cache empty-wrap mod) |
1407 | mod)) | |
a63812a2 JB |
1408 | (loop (cdr bs) er r-cache)) |
1409 | (loop (cdr bs) er-cache r-cache))))) | |
1410 | (set-cdr! r (extend-env labels bindings (cdr r))) | |
1411 | (build-letrec no-source | |
39a2eca2 | 1412 | (map syntax->datum var-ids) |
a63812a2 JB |
1413 | vars |
1414 | (map (lambda (x) | |
4e237f14 | 1415 | (chi (cdr x) (car x) empty-wrap mod)) |
a63812a2 JB |
1416 | vals) |
1417 | (build-sequence no-source | |
1418 | (map (lambda (x) | |
4e237f14 AW |
1419 | (chi (cdr x) (car x) empty-wrap mod)) |
1420 | (cons (cons er (source-wrap e w s mod)) | |
a63812a2 JB |
1421 | (cdr body))))))))))))))))) |
1422 | ||
1423 | (define chi-lambda-clause | |
0ee32d01 | 1424 | (lambda (e docstring c r w mod k) |
a63812a2 | 1425 | (syntax-case c () |
0ee32d01 | 1426 | ((args doc e1 e2 ...) |
22225fc1 | 1427 | (and (string? (syntax->datum (syntax doc))) (not docstring)) |
0ee32d01 | 1428 | (chi-lambda-clause e (syntax doc) (syntax (args e1 e2 ...)) r w mod k)) |
a63812a2 JB |
1429 | (((id ...) e1 e2 ...) |
1430 | (let ((ids (syntax (id ...)))) | |
1431 | (if (not (valid-bound-ids? ids)) | |
e4721dde | 1432 | (syntax-violation 'lambda "invalid parameter list" e) |
a63812a2 JB |
1433 | (let ((labels (gen-labels ids)) |
1434 | (new-vars (map gen-var ids))) | |
547a602d AW |
1435 | (k (map syntax->datum ids) |
1436 | new-vars | |
8bb0b3cc | 1437 | (and docstring (syntax->datum docstring)) |
a63812a2 JB |
1438 | (chi-body (syntax (e1 e2 ...)) |
1439 | e | |
1440 | (extend-var-env labels new-vars r) | |
4e237f14 AW |
1441 | (make-binding-wrap ids labels w) |
1442 | mod)))))) | |
a63812a2 JB |
1443 | ((ids e1 e2 ...) |
1444 | (let ((old-ids (lambda-var-list (syntax ids)))) | |
1445 | (if (not (valid-bound-ids? old-ids)) | |
e4721dde | 1446 | (syntax-violation 'lambda "invalid parameter list" e) |
a63812a2 JB |
1447 | (let ((labels (gen-labels old-ids)) |
1448 | (new-vars (map gen-var old-ids))) | |
547a602d AW |
1449 | (k (let f ((ls1 (cdr old-ids)) (ls2 (car old-ids))) |
1450 | (if (null? ls1) | |
1451 | (syntax->datum ls2) | |
1452 | (f (cdr ls1) (cons (syntax->datum (car ls1)) ls2)))) | |
1453 | (let f ((ls1 (cdr new-vars)) (ls2 (car new-vars))) | |
a63812a2 JB |
1454 | (if (null? ls1) |
1455 | ls2 | |
1456 | (f (cdr ls1) (cons (car ls1) ls2)))) | |
8bb0b3cc | 1457 | (and docstring (syntax->datum docstring)) |
a63812a2 JB |
1458 | (chi-body (syntax (e1 e2 ...)) |
1459 | e | |
1460 | (extend-var-env labels new-vars r) | |
4e237f14 AW |
1461 | (make-binding-wrap old-ids labels w) |
1462 | mod)))))) | |
e4721dde | 1463 | (_ (syntax-violation 'lambda "bad lambda" e))))) |
a63812a2 JB |
1464 | |
1465 | (define chi-local-syntax | |
4e237f14 | 1466 | (lambda (rec? e r w s mod k) |
a63812a2 JB |
1467 | (syntax-case e () |
1468 | ((_ ((id val) ...) e1 e2 ...) | |
1469 | (let ((ids (syntax (id ...)))) | |
1470 | (if (not (valid-bound-ids? ids)) | |
e4721dde | 1471 | (syntax-violation #f "duplicate bound keyword" e) |
a63812a2 JB |
1472 | (let ((labels (gen-labels ids))) |
1473 | (let ((new-w (make-binding-wrap ids labels w))) | |
1474 | (k (syntax (e1 e2 ...)) | |
1475 | (extend-env | |
1476 | labels | |
1477 | (let ((w (if rec? new-w w)) | |
1478 | (trans-r (macros-only-env r))) | |
1479 | (map (lambda (x) | |
1480 | (make-binding 'macro | |
4e237f14 AW |
1481 | (eval-local-transformer |
1482 | (chi x trans-r w mod) | |
1483 | mod))) | |
a63812a2 JB |
1484 | (syntax (val ...)))) |
1485 | r) | |
1486 | new-w | |
4e237f14 AW |
1487 | s |
1488 | mod)))))) | |
e4721dde AW |
1489 | (_ (syntax-violation #f "bad local syntax definition" |
1490 | (source-wrap e w s mod)))))) | |
a63812a2 JB |
1491 | |
1492 | (define eval-local-transformer | |
4e237f14 AW |
1493 | (lambda (expanded mod) |
1494 | (let ((p (local-eval-hook expanded mod))) | |
a63812a2 JB |
1495 | (if (procedure? p) |
1496 | p | |
e4721dde | 1497 | (syntax-violation #f "nonprocedure transformer" p))))) |
a63812a2 JB |
1498 | |
1499 | (define chi-void | |
1500 | (lambda () | |
a1a482e0 | 1501 | (build-void no-source))) |
a63812a2 JB |
1502 | |
1503 | (define ellipsis? | |
1504 | (lambda (x) | |
1505 | (and (nonsymbol-id? x) | |
1506 | (free-id=? x (syntax (... ...)))))) | |
1507 | ||
1508 | ;;; data | |
1509 | ||
b40d0230 AW |
1510 | ;;; strips syntax-objects down to top-wrap |
1511 | ;;; | |
a63812a2 JB |
1512 | ;;; since only the head of a list is annotated by the reader, not each pair |
1513 | ;;; in the spine, we also check for pairs whose cars are annotated in case | |
1514 | ;;; we've been passed the cdr of an annotated list | |
1515 | ||
1516 | (define strip | |
1517 | (lambda (x w) | |
1518 | (if (top-marked? w) | |
b40d0230 | 1519 | x |
a63812a2 JB |
1520 | (let f ((x x)) |
1521 | (cond | |
b40d0230 AW |
1522 | ((syntax-object? x) |
1523 | (strip (syntax-object-expression x) (syntax-object-wrap x))) | |
1524 | ((pair? x) | |
1525 | (let ((a (f (car x))) (d (f (cdr x)))) | |
1526 | (if (and (eq? a (car x)) (eq? d (cdr x))) | |
1527 | x | |
1528 | (cons a d)))) | |
1529 | ((vector? x) | |
1530 | (let ((old (vector->list x))) | |
1531 | (let ((new (map f old))) | |
1532 | (if (and-map* eq? old new) x (list->vector new))))) | |
1533 | (else x)))))) | |
a63812a2 JB |
1534 | |
1535 | ;;; lexical variables | |
1536 | ||
1537 | (define gen-var | |
1538 | (lambda (id) | |
1539 | (let ((id (if (syntax-object? id) (syntax-object-expression id) id))) | |
b40d0230 | 1540 | (build-lexical-var no-source id)))) |
a63812a2 JB |
1541 | |
1542 | (define lambda-var-list | |
1543 | (lambda (vars) | |
1544 | (let lvl ((vars vars) (ls '()) (w empty-wrap)) | |
1545 | (cond | |
4e237f14 AW |
1546 | ((pair? vars) (lvl (cdr vars) (cons (wrap (car vars) w #f) ls) w)) |
1547 | ((id? vars) (cons (wrap vars w #f) ls)) | |
a63812a2 JB |
1548 | ((null? vars) ls) |
1549 | ((syntax-object? vars) | |
1550 | (lvl (syntax-object-expression vars) | |
1551 | ls | |
1552 | (join-wraps w (syntax-object-wrap vars)))) | |
a63812a2 JB |
1553 | ; include anything else to be caught by subsequent error |
1554 | ; checking | |
1555 | (else (cons vars ls)))))) | |
1556 | ||
1557 | ;;; core transformers | |
1558 | ||
1559 | (global-extend 'local-syntax 'letrec-syntax #t) | |
1560 | (global-extend 'local-syntax 'let-syntax #f) | |
1561 | ||
1562 | (global-extend 'core 'fluid-let-syntax | |
4e237f14 | 1563 | (lambda (e r w s mod) |
a63812a2 JB |
1564 | (syntax-case e () |
1565 | ((_ ((var val) ...) e1 e2 ...) | |
1566 | (valid-bound-ids? (syntax (var ...))) | |
1567 | (let ((names (map (lambda (x) (id-var-name x w)) (syntax (var ...))))) | |
1568 | (for-each | |
1569 | (lambda (id n) | |
8e1d0d50 | 1570 | (case (binding-type (lookup n r mod)) |
a63812a2 | 1571 | ((displaced-lexical) |
e4721dde AW |
1572 | (syntax-violation 'fluid-let-syntax |
1573 | "identifier out of context" | |
1574 | e | |
1575 | (source-wrap id w s mod))))) | |
a63812a2 JB |
1576 | (syntax (var ...)) |
1577 | names) | |
1578 | (chi-body | |
1579 | (syntax (e1 e2 ...)) | |
4e237f14 | 1580 | (source-wrap e w s mod) |
a63812a2 JB |
1581 | (extend-env |
1582 | names | |
1583 | (let ((trans-r (macros-only-env r))) | |
1584 | (map (lambda (x) | |
1585 | (make-binding 'macro | |
4e237f14 AW |
1586 | (eval-local-transformer (chi x trans-r w mod) |
1587 | mod))) | |
a63812a2 JB |
1588 | (syntax (val ...)))) |
1589 | r) | |
4e237f14 AW |
1590 | w |
1591 | mod))) | |
e4721dde AW |
1592 | (_ (syntax-violation 'fluid-let-syntax "bad syntax" |
1593 | (source-wrap e w s mod)))))) | |
a63812a2 JB |
1594 | |
1595 | (global-extend 'core 'quote | |
4e237f14 | 1596 | (lambda (e r w s mod) |
a63812a2 JB |
1597 | (syntax-case e () |
1598 | ((_ e) (build-data s (strip (syntax e) w))) | |
e4721dde AW |
1599 | (_ (syntax-violation 'quote "bad syntax" |
1600 | (source-wrap e w s mod)))))) | |
a63812a2 JB |
1601 | |
1602 | (global-extend 'core 'syntax | |
1603 | (let () | |
1604 | (define gen-syntax | |
8e1d0d50 | 1605 | (lambda (src e r maps ellipsis? mod) |
a63812a2 JB |
1606 | (if (id? e) |
1607 | (let ((label (id-var-name e empty-wrap))) | |
8e1d0d50 | 1608 | (let ((b (lookup label r mod))) |
a63812a2 JB |
1609 | (if (eq? (binding-type b) 'syntax) |
1610 | (call-with-values | |
1611 | (lambda () | |
1612 | (let ((var.lev (binding-value b))) | |
1613 | (gen-ref src (car var.lev) (cdr var.lev) maps))) | |
1614 | (lambda (var maps) (values `(ref ,var) maps))) | |
1615 | (if (ellipsis? e) | |
e4721dde | 1616 | (syntax-violation 'syntax "misplaced ellipsis" src) |
a63812a2 JB |
1617 | (values `(quote ,e) maps))))) |
1618 | (syntax-case e () | |
1619 | ((dots e) | |
1620 | (ellipsis? (syntax dots)) | |
8e1d0d50 | 1621 | (gen-syntax src (syntax e) r maps (lambda (x) #f) mod)) |
a63812a2 JB |
1622 | ((x dots . y) |
1623 | ; this could be about a dozen lines of code, except that we | |
1624 | ; choose to handle (syntax (x ... ...)) forms | |
1625 | (ellipsis? (syntax dots)) | |
1626 | (let f ((y (syntax y)) | |
1627 | (k (lambda (maps) | |
1628 | (call-with-values | |
1629 | (lambda () | |
1630 | (gen-syntax src (syntax x) r | |
8e1d0d50 | 1631 | (cons '() maps) ellipsis? mod)) |
a63812a2 JB |
1632 | (lambda (x maps) |
1633 | (if (null? (car maps)) | |
e4721dde AW |
1634 | (syntax-violation 'syntax "extra ellipsis" |
1635 | src) | |
a63812a2 JB |
1636 | (values (gen-map x (car maps)) |
1637 | (cdr maps)))))))) | |
1638 | (syntax-case y () | |
1639 | ((dots . y) | |
1640 | (ellipsis? (syntax dots)) | |
1641 | (f (syntax y) | |
1642 | (lambda (maps) | |
1643 | (call-with-values | |
1644 | (lambda () (k (cons '() maps))) | |
1645 | (lambda (x maps) | |
1646 | (if (null? (car maps)) | |
e4721dde | 1647 | (syntax-violation 'syntax "extra ellipsis" src) |
a63812a2 JB |
1648 | (values (gen-mappend x (car maps)) |
1649 | (cdr maps)))))))) | |
1650 | (_ (call-with-values | |
8e1d0d50 | 1651 | (lambda () (gen-syntax src y r maps ellipsis? mod)) |
a63812a2 JB |
1652 | (lambda (y maps) |
1653 | (call-with-values | |
1654 | (lambda () (k maps)) | |
1655 | (lambda (x maps) | |
1656 | (values (gen-append x y) maps))))))))) | |
1657 | ((x . y) | |
1658 | (call-with-values | |
8e1d0d50 | 1659 | (lambda () (gen-syntax src (syntax x) r maps ellipsis? mod)) |
a63812a2 JB |
1660 | (lambda (x maps) |
1661 | (call-with-values | |
8e1d0d50 | 1662 | (lambda () (gen-syntax src (syntax y) r maps ellipsis? mod)) |
a63812a2 JB |
1663 | (lambda (y maps) (values (gen-cons x y) maps)))))) |
1664 | (#(e1 e2 ...) | |
1665 | (call-with-values | |
1666 | (lambda () | |
8e1d0d50 | 1667 | (gen-syntax src (syntax (e1 e2 ...)) r maps ellipsis? mod)) |
a63812a2 JB |
1668 | (lambda (e maps) (values (gen-vector e) maps)))) |
1669 | (_ (values `(quote ,e) maps)))))) | |
1670 | ||
1671 | (define gen-ref | |
1672 | (lambda (src var level maps) | |
1673 | (if (fx= level 0) | |
1674 | (values var maps) | |
1675 | (if (null? maps) | |
e4721dde | 1676 | (syntax-violation 'syntax "missing ellipsis" src) |
a63812a2 JB |
1677 | (call-with-values |
1678 | (lambda () (gen-ref src var (fx- level 1) (cdr maps))) | |
1679 | (lambda (outer-var outer-maps) | |
1680 | (let ((b (assq outer-var (car maps)))) | |
1681 | (if b | |
1682 | (values (cdr b) maps) | |
1683 | (let ((inner-var (gen-var 'tmp))) | |
1684 | (values inner-var | |
1685 | (cons (cons (cons outer-var inner-var) | |
1686 | (car maps)) | |
1687 | outer-maps))))))))))) | |
1688 | ||
1689 | (define gen-mappend | |
1690 | (lambda (e map-env) | |
1691 | `(apply (primitive append) ,(gen-map e map-env)))) | |
1692 | ||
1693 | (define gen-map | |
1694 | (lambda (e map-env) | |
1695 | (let ((formals (map cdr map-env)) | |
1696 | (actuals (map (lambda (x) `(ref ,(car x))) map-env))) | |
1697 | (cond | |
1698 | ((eq? (car e) 'ref) | |
1699 | ; identity map equivalence: | |
1700 | ; (map (lambda (x) x) y) == y | |
1701 | (car actuals)) | |
4d248541 | 1702 | ((and-map |
a63812a2 JB |
1703 | (lambda (x) (and (eq? (car x) 'ref) (memq (cadr x) formals))) |
1704 | (cdr e)) | |
1705 | ; eta map equivalence: | |
1706 | ; (map (lambda (x ...) (f x ...)) y ...) == (map f y ...) | |
1707 | `(map (primitive ,(car e)) | |
1708 | ,@(map (let ((r (map cons formals actuals))) | |
1709 | (lambda (x) (cdr (assq (cadr x) r)))) | |
1710 | (cdr e)))) | |
1711 | (else `(map (lambda ,formals ,e) ,@actuals)))))) | |
1712 | ||
1713 | (define gen-cons | |
1714 | (lambda (x y) | |
1715 | (case (car y) | |
1716 | ((quote) | |
1717 | (if (eq? (car x) 'quote) | |
1718 | `(quote (,(cadr x) . ,(cadr y))) | |
1719 | (if (eq? (cadr y) '()) | |
1720 | `(list ,x) | |
1721 | `(cons ,x ,y)))) | |
1722 | ((list) `(list ,x ,@(cdr y))) | |
1723 | (else `(cons ,x ,y))))) | |
1724 | ||
1725 | (define gen-append | |
1726 | (lambda (x y) | |
1727 | (if (equal? y '(quote ())) | |
1728 | x | |
1729 | `(append ,x ,y)))) | |
1730 | ||
1731 | (define gen-vector | |
1732 | (lambda (x) | |
1733 | (cond | |
1734 | ((eq? (car x) 'list) `(vector ,@(cdr x))) | |
1735 | ((eq? (car x) 'quote) `(quote #(,@(cadr x)))) | |
1736 | (else `(list->vector ,x))))) | |
1737 | ||
1738 | ||
1739 | (define regen | |
1740 | (lambda (x) | |
1741 | (case (car x) | |
f4a644ee | 1742 | ((ref) (build-lexical-reference 'value no-source (cadr x) (cadr x))) |
a63812a2 JB |
1743 | ((primitive) (build-primref no-source (cadr x))) |
1744 | ((quote) (build-data no-source (cadr x))) | |
547a602d | 1745 | ((lambda) (build-lambda no-source (cadr x) (cadr x) #f (regen (caddr x)))) |
a63812a2 JB |
1746 | (else (build-application no-source |
1747 | (build-primref no-source (car x)) | |
1748 | (map regen (cdr x))))))) | |
1749 | ||
4e237f14 AW |
1750 | (lambda (e r w s mod) |
1751 | (let ((e (source-wrap e w s mod))) | |
a63812a2 JB |
1752 | (syntax-case e () |
1753 | ((_ x) | |
1754 | (call-with-values | |
8e1d0d50 | 1755 | (lambda () (gen-syntax e (syntax x) r '() ellipsis? mod)) |
a63812a2 | 1756 | (lambda (e maps) (regen e)))) |
e4721dde | 1757 | (_ (syntax-violation 'syntax "bad `syntax' form" e))))))) |
a63812a2 JB |
1758 | |
1759 | ||
1760 | (global-extend 'core 'lambda | |
4e237f14 | 1761 | (lambda (e r w s mod) |
a63812a2 JB |
1762 | (syntax-case e () |
1763 | ((_ . c) | |
0ee32d01 | 1764 | (chi-lambda-clause (source-wrap e w s mod) #f (syntax c) r w mod |
547a602d AW |
1765 | (lambda (names vars docstring body) |
1766 | (build-lambda s names vars docstring body))))))) | |
a63812a2 JB |
1767 | |
1768 | ||
1769 | (global-extend 'core 'let | |
1770 | (let () | |
4e237f14 | 1771 | (define (chi-let e r w s mod constructor ids vals exps) |
a63812a2 | 1772 | (if (not (valid-bound-ids? ids)) |
e4721dde | 1773 | (syntax-violation 'let "duplicate bound variable" e) |
a63812a2 JB |
1774 | (let ((labels (gen-labels ids)) |
1775 | (new-vars (map gen-var ids))) | |
1776 | (let ((nw (make-binding-wrap ids labels w)) | |
1777 | (nr (extend-var-env labels new-vars r))) | |
1778 | (constructor s | |
547a602d | 1779 | (map syntax->datum ids) |
a63812a2 | 1780 | new-vars |
4e237f14 AW |
1781 | (map (lambda (x) (chi x r w mod)) vals) |
1782 | (chi-body exps (source-wrap e nw s mod) | |
1783 | nr nw mod)))))) | |
1784 | (lambda (e r w s mod) | |
a63812a2 JB |
1785 | (syntax-case e () |
1786 | ((_ ((id val) ...) e1 e2 ...) | |
dc1eed52 | 1787 | (and-map id? (syntax (id ...))) |
4e237f14 | 1788 | (chi-let e r w s mod |
a63812a2 JB |
1789 | build-let |
1790 | (syntax (id ...)) | |
1791 | (syntax (val ...)) | |
1792 | (syntax (e1 e2 ...)))) | |
1793 | ((_ f ((id val) ...) e1 e2 ...) | |
dc1eed52 | 1794 | (and (id? (syntax f)) (and-map id? (syntax (id ...)))) |
4e237f14 | 1795 | (chi-let e r w s mod |
a63812a2 JB |
1796 | build-named-let |
1797 | (syntax (f id ...)) | |
1798 | (syntax (val ...)) | |
1799 | (syntax (e1 e2 ...)))) | |
e4721dde | 1800 | (_ (syntax-violation 'let "bad let" (source-wrap e w s mod))))))) |
a63812a2 JB |
1801 | |
1802 | ||
1803 | (global-extend 'core 'letrec | |
4e237f14 | 1804 | (lambda (e r w s mod) |
a63812a2 JB |
1805 | (syntax-case e () |
1806 | ((_ ((id val) ...) e1 e2 ...) | |
dc1eed52 | 1807 | (and-map id? (syntax (id ...))) |
a63812a2 JB |
1808 | (let ((ids (syntax (id ...)))) |
1809 | (if (not (valid-bound-ids? ids)) | |
e4721dde | 1810 | (syntax-violation 'letrec "duplicate bound variable" e) |
a63812a2 JB |
1811 | (let ((labels (gen-labels ids)) |
1812 | (new-vars (map gen-var ids))) | |
1813 | (let ((w (make-binding-wrap ids labels w)) | |
1814 | (r (extend-var-env labels new-vars r))) | |
1815 | (build-letrec s | |
547a602d | 1816 | (map syntax->datum ids) |
a63812a2 | 1817 | new-vars |
4e237f14 AW |
1818 | (map (lambda (x) (chi x r w mod)) (syntax (val ...))) |
1819 | (chi-body (syntax (e1 e2 ...)) | |
1820 | (source-wrap e w s mod) r w mod))))))) | |
e4721dde | 1821 | (_ (syntax-violation 'letrec "bad letrec" (source-wrap e w s mod)))))) |
a63812a2 JB |
1822 | |
1823 | ||
1824 | (global-extend 'core 'set! | |
4e237f14 | 1825 | (lambda (e r w s mod) |
a63812a2 JB |
1826 | (syntax-case e () |
1827 | ((_ id val) | |
1828 | (id? (syntax id)) | |
4e237f14 | 1829 | (let ((val (chi (syntax val) r w mod)) |
a63812a2 | 1830 | (n (id-var-name (syntax id) w))) |
8e1d0d50 | 1831 | (let ((b (lookup n r mod))) |
a63812a2 JB |
1832 | (case (binding-type b) |
1833 | ((lexical) | |
f4a644ee AW |
1834 | (build-lexical-assignment s |
1835 | (syntax->datum (syntax id)) | |
1836 | (binding-value b) | |
1837 | val)) | |
4e237f14 | 1838 | ((global) (build-global-assignment s n val mod)) |
a63812a2 | 1839 | ((displaced-lexical) |
e4721dde AW |
1840 | (syntax-violation 'set! "identifier out of context" |
1841 | (wrap (syntax id) w mod))) | |
1842 | (else (syntax-violation 'set! "bad set!" | |
1843 | (source-wrap e w s mod))))))) | |
dec62b5e AW |
1844 | ((_ (head tail ...) val) |
1845 | (call-with-values | |
1846 | (lambda () (syntax-type (syntax head) r empty-wrap no-source #f mod)) | |
1847 | (lambda (type value ee ww ss modmod) | |
1848 | (case type | |
1849 | ((module-ref) | |
01c161ca AW |
1850 | (let ((val (chi (syntax val) r w mod))) |
1851 | (call-with-values (lambda () (value (syntax (head tail ...)))) | |
1852 | (lambda (id mod) | |
1853 | (build-global-assignment s id val mod))))) | |
dec62b5e AW |
1854 | (else |
1855 | (build-application s | |
1856 | (chi (syntax (setter head)) r w mod) | |
1857 | (map (lambda (e) (chi e r w mod)) | |
1858 | (syntax (tail ... val))))))))) | |
e4721dde | 1859 | (_ (syntax-violation 'set! "bad set!" (source-wrap e w s mod)))))) |
a63812a2 | 1860 | |
265e6127 | 1861 | (global-extend 'module-ref '@ |
dec62b5e | 1862 | (lambda (e) |
384e92b3 | 1863 | (syntax-case e () |
265e6127 | 1864 | ((_ (mod ...) id) |
4d248541 | 1865 | (and (and-map id? (syntax (mod ...))) (id? (syntax id))) |
22225fc1 AW |
1866 | (values (syntax->datum (syntax id)) |
1867 | (syntax->datum | |
a2716cbe | 1868 | (syntax (public mod ...)))))))) |
265e6127 AW |
1869 | |
1870 | (global-extend 'module-ref '@@ | |
dec62b5e | 1871 | (lambda (e) |
265e6127 AW |
1872 | (syntax-case e () |
1873 | ((_ (mod ...) id) | |
4d248541 | 1874 | (and (and-map id? (syntax (mod ...))) (id? (syntax id))) |
22225fc1 AW |
1875 | (values (syntax->datum (syntax id)) |
1876 | (syntax->datum | |
a2716cbe | 1877 | (syntax (private mod ...)))))))) |
265e6127 | 1878 | |
a1a482e0 AW |
1879 | (global-extend 'core 'if |
1880 | (lambda (e r w s mod) | |
1881 | (syntax-case e () | |
1882 | ((_ test then) | |
1883 | (build-conditional | |
1884 | s | |
1885 | (chi (syntax test) r w mod) | |
1886 | (chi (syntax then) r w mod) | |
1887 | (build-void no-source))) | |
1888 | ((_ test then else) | |
1889 | (build-conditional | |
1890 | s | |
1891 | (chi (syntax test) r w mod) | |
1892 | (chi (syntax then) r w mod) | |
1893 | (chi (syntax else) r w mod)))))) | |
1894 | ||
a63812a2 JB |
1895 | (global-extend 'begin 'begin '()) |
1896 | ||
1897 | (global-extend 'define 'define '()) | |
1898 | ||
1899 | (global-extend 'define-syntax 'define-syntax '()) | |
1900 | ||
1901 | (global-extend 'eval-when 'eval-when '()) | |
1902 | ||
1903 | (global-extend 'core 'syntax-case | |
1904 | (let () | |
1905 | (define convert-pattern | |
1906 | ; accepts pattern & keys | |
5f1a2fb1 | 1907 | ; returns $sc-dispatch pattern & ids |
a63812a2 JB |
1908 | (lambda (pattern keys) |
1909 | (let cvt ((p pattern) (n 0) (ids '())) | |
1910 | (if (id? p) | |
1911 | (if (bound-id-member? p keys) | |
1912 | (values (vector 'free-id p) ids) | |
1913 | (values 'any (cons (cons p n) ids))) | |
1914 | (syntax-case p () | |
1915 | ((x dots) | |
1916 | (ellipsis? (syntax dots)) | |
1917 | (call-with-values | |
1918 | (lambda () (cvt (syntax x) (fx+ n 1) ids)) | |
1919 | (lambda (p ids) | |
1920 | (values (if (eq? p 'any) 'each-any (vector 'each p)) | |
1921 | ids)))) | |
1922 | ((x . y) | |
1923 | (call-with-values | |
1924 | (lambda () (cvt (syntax y) n ids)) | |
1925 | (lambda (y ids) | |
1926 | (call-with-values | |
1927 | (lambda () (cvt (syntax x) n ids)) | |
1928 | (lambda (x ids) | |
1929 | (values (cons x y) ids)))))) | |
1930 | (() (values '() ids)) | |
1931 | (#(x ...) | |
1932 | (call-with-values | |
1933 | (lambda () (cvt (syntax (x ...)) n ids)) | |
1934 | (lambda (p ids) (values (vector 'vector p) ids)))) | |
1935 | (x (values (vector 'atom (strip p empty-wrap)) ids))))))) | |
1936 | ||
1937 | (define build-dispatch-call | |
4e237f14 | 1938 | (lambda (pvars exp y r mod) |
a63812a2 JB |
1939 | (let ((ids (map car pvars)) (levels (map cdr pvars))) |
1940 | (let ((labels (gen-labels ids)) (new-vars (map gen-var ids))) | |
1941 | (build-application no-source | |
1942 | (build-primref no-source 'apply) | |
547a602d | 1943 | (list (build-lambda no-source (map syntax->datum ids) new-vars #f |
a63812a2 | 1944 | (chi exp |
4e237f14 AW |
1945 | (extend-env |
1946 | labels | |
1947 | (map (lambda (var level) | |
1948 | (make-binding 'syntax `(,var . ,level))) | |
1949 | new-vars | |
1950 | (map cdr pvars)) | |
1951 | r) | |
1952 | (make-binding-wrap ids labels empty-wrap) | |
1953 | mod)) | |
a63812a2 JB |
1954 | y)))))) |
1955 | ||
1956 | (define gen-clause | |
4e237f14 | 1957 | (lambda (x keys clauses r pat fender exp mod) |
a63812a2 JB |
1958 | (call-with-values |
1959 | (lambda () (convert-pattern pat keys)) | |
1960 | (lambda (p pvars) | |
1961 | (cond | |
1962 | ((not (distinct-bound-ids? (map car pvars))) | |
e4721dde | 1963 | (syntax-violation 'syntax-case "duplicate pattern variable" pat)) |
4d248541 | 1964 | ((not (and-map (lambda (x) (not (ellipsis? (car x)))) pvars)) |
e4721dde | 1965 | (syntax-violation 'syntax-case "misplaced ellipsis" pat)) |
a63812a2 JB |
1966 | (else |
1967 | (let ((y (gen-var 'tmp))) | |
1968 | ; fat finger binding and references to temp variable y | |
1969 | (build-application no-source | |
547a602d | 1970 | (build-lambda no-source (list 'tmp) (list y) #f |
f4a644ee AW |
1971 | (let ((y (build-lexical-reference 'value no-source |
1972 | 'tmp y))) | |
a63812a2 JB |
1973 | (build-conditional no-source |
1974 | (syntax-case fender () | |
1975 | (#t y) | |
1976 | (_ (build-conditional no-source | |
1977 | y | |
4e237f14 | 1978 | (build-dispatch-call pvars fender y r mod) |
a63812a2 | 1979 | (build-data no-source #f)))) |
4e237f14 AW |
1980 | (build-dispatch-call pvars exp y r mod) |
1981 | (gen-syntax-case x keys clauses r mod)))) | |
a63812a2 JB |
1982 | (list (if (eq? p 'any) |
1983 | (build-application no-source | |
1984 | (build-primref no-source 'list) | |
1985 | (list x)) | |
1986 | (build-application no-source | |
5f1a2fb1 | 1987 | (build-primref no-source '$sc-dispatch) |
a63812a2 JB |
1988 | (list x (build-data no-source p))))))))))))) |
1989 | ||
1990 | (define gen-syntax-case | |
4e237f14 | 1991 | (lambda (x keys clauses r mod) |
a63812a2 JB |
1992 | (if (null? clauses) |
1993 | (build-application no-source | |
e4721dde | 1994 | (build-primref no-source 'syntax-violation) |
e32a1792 AW |
1995 | (list (build-data no-source #f) |
1996 | (build-data no-source | |
1997 | "source expression failed to match any pattern") | |
1998 | x)) | |
a63812a2 JB |
1999 | (syntax-case (car clauses) () |
2000 | ((pat exp) | |
2001 | (if (and (id? (syntax pat)) | |
4d248541 AW |
2002 | (and-map (lambda (x) (not (free-id=? (syntax pat) x))) |
2003 | (cons (syntax (... ...)) keys))) | |
a63812a2 JB |
2004 | (let ((labels (list (gen-label))) |
2005 | (var (gen-var (syntax pat)))) | |
2006 | (build-application no-source | |
547a602d AW |
2007 | (build-lambda no-source |
2008 | (list (syntax->datum (syntax pat))) (list var) | |
2009 | #f | |
a63812a2 JB |
2010 | (chi (syntax exp) |
2011 | (extend-env labels | |
2012 | (list (make-binding 'syntax `(,var . 0))) | |
2013 | r) | |
2014 | (make-binding-wrap (syntax (pat)) | |
4e237f14 AW |
2015 | labels empty-wrap) |
2016 | mod)) | |
a63812a2 JB |
2017 | (list x))) |
2018 | (gen-clause x keys (cdr clauses) r | |
4e237f14 | 2019 | (syntax pat) #t (syntax exp) mod))) |
a63812a2 JB |
2020 | ((pat fender exp) |
2021 | (gen-clause x keys (cdr clauses) r | |
4e237f14 | 2022 | (syntax pat) (syntax fender) (syntax exp) mod)) |
e4721dde AW |
2023 | (_ (syntax-violation 'syntax-case "invalid clause" |
2024 | (car clauses))))))) | |
a63812a2 | 2025 | |
4e237f14 AW |
2026 | (lambda (e r w s mod) |
2027 | (let ((e (source-wrap e w s mod))) | |
a63812a2 JB |
2028 | (syntax-case e () |
2029 | ((_ val (key ...) m ...) | |
4d248541 AW |
2030 | (if (and-map (lambda (x) (and (id? x) (not (ellipsis? x)))) |
2031 | (syntax (key ...))) | |
a63812a2 JB |
2032 | (let ((x (gen-var 'tmp))) |
2033 | ; fat finger binding and references to temp variable x | |
2034 | (build-application s | |
547a602d | 2035 | (build-lambda no-source (list 'tmp) (list x) #f |
f4a644ee AW |
2036 | (gen-syntax-case (build-lexical-reference 'value no-source |
2037 | 'tmp x) | |
a63812a2 | 2038 | (syntax (key ...)) (syntax (m ...)) |
4e237f14 AW |
2039 | r |
2040 | mod)) | |
2041 | (list (chi (syntax val) r empty-wrap mod)))) | |
e4721dde | 2042 | (syntax-violation 'syntax-case "invalid literals list" e)))))))) |
a63812a2 JB |
2043 | |
2044 | ;;; The portable sc-expand seeds chi-top's mode m with 'e (for | |
2045 | ;;; evaluating) and esew (which stands for "eval syntax expanders | |
2046 | ;;; when") with '(eval). In Chez Scheme, m is set to 'c instead of e | |
2047 | ;;; if we are compiling a file, and esew is set to | |
2048 | ;;; (eval-syntactic-expanders-when), which defaults to the list | |
2049 | ;;; '(compile load eval). This means that, by default, top-level | |
2050 | ;;; syntactic definitions are evaluated immediately after they are | |
2051 | ;;; expanded, and the expanded definitions are also residualized into | |
2052 | ;;; the object file if we are compiling a file. | |
2053 | (set! sc-expand | |
71f46dbd AW |
2054 | (lambda (x . rest) |
2055 | (if (and (pair? x) (equal? (car x) noexpand)) | |
2056 | (cadr x) | |
2057 | (let ((m (if (null? rest) 'e (car rest))) | |
2058 | (esew (if (or (null? rest) (null? (cdr rest))) | |
2059 | '(eval) | |
2060 | (cadr rest)))) | |
2061 | (with-fluid* *mode* m | |
2062 | (lambda () | |
2063 | (chi-top x null-env top-wrap m esew | |
2064 | (cons 'hygiene (module-name (current-module)))))))))) | |
a63812a2 JB |
2065 | |
2066 | (set! identifier? | |
2067 | (lambda (x) | |
2068 | (nonsymbol-id? x))) | |
2069 | ||
22225fc1 | 2070 | (set! datum->syntax |
a63812a2 | 2071 | (lambda (id datum) |
e02e84de | 2072 | (make-syntax-object datum (syntax-object-wrap id) #f))) |
a63812a2 | 2073 | |
22225fc1 | 2074 | (set! syntax->datum |
a63812a2 JB |
2075 | ; accepts any object, since syntax objects may consist partially |
2076 | ; or entirely of unwrapped, nonsymbolic data | |
2077 | (lambda (x) | |
2078 | (strip x empty-wrap))) | |
2079 | ||
2080 | (set! generate-temporaries | |
2081 | (lambda (ls) | |
2082 | (arg-check list? ls 'generate-temporaries) | |
4e237f14 | 2083 | (map (lambda (x) (wrap (gensym-hook) top-wrap #f)) ls))) |
a63812a2 JB |
2084 | |
2085 | (set! free-identifier=? | |
2086 | (lambda (x y) | |
2087 | (arg-check nonsymbol-id? x 'free-identifier=?) | |
2088 | (arg-check nonsymbol-id? y 'free-identifier=?) | |
2089 | (free-id=? x y))) | |
2090 | ||
2091 | (set! bound-identifier=? | |
2092 | (lambda (x y) | |
2093 | (arg-check nonsymbol-id? x 'bound-identifier=?) | |
2094 | (arg-check nonsymbol-id? y 'bound-identifier=?) | |
2095 | (bound-id=? x y))) | |
2096 | ||
e4721dde AW |
2097 | (set! syntax-violation |
2098 | (lambda (who message form . subform) | |
2099 | (arg-check (lambda (x) (or (not x) (string? x) (symbol? x))) | |
2100 | who 'syntax-violation) | |
2101 | (arg-check string? message 'syntax-violation) | |
2102 | (scm-error 'syntax-error 'sc-expand | |
2103 | (string-append | |
2104 | (if who "~a: " "") | |
2105 | "~a " | |
2106 | (if (null? subform) "in ~a" "in subform `~s' of `~s'")) | |
2107 | (let ((tail (cons message | |
2108 | (map (lambda (x) (strip x empty-wrap)) | |
2109 | (append subform (list form)))))) | |
2110 | (if who (cons who tail) tail)) | |
2111 | #f))) | |
a63812a2 | 2112 | |
5f1a2fb1 | 2113 | ;;; $sc-dispatch expects an expression and a pattern. If the expression |
a63812a2 JB |
2114 | ;;; matches the pattern a list of the matching expressions for each |
2115 | ;;; "any" is returned. Otherwise, #f is returned. (This use of #f will | |
2116 | ;;; not work on r4rs implementations that violate the ieee requirement | |
2117 | ;;; that #f and () be distinct.) | |
2118 | ||
2119 | ;;; The expression is matched with the pattern as follows: | |
2120 | ||
2121 | ;;; pattern: matches: | |
2122 | ;;; () empty list | |
2123 | ;;; any anything | |
2124 | ;;; (<pattern>1 . <pattern>2) (<pattern>1 . <pattern>2) | |
2125 | ;;; each-any (any*) | |
2126 | ;;; #(free-id <key>) <key> with free-identifier=? | |
2127 | ;;; #(each <pattern>) (<pattern>*) | |
2128 | ;;; #(vector <pattern>) (list->vector <pattern>) | |
2129 | ;;; #(atom <object>) <object> with "equal?" | |
2130 | ||
2131 | ;;; Vector cops out to pair under assumption that vectors are rare. If | |
2132 | ;;; not, should convert to: | |
2133 | ;;; #(vector <pattern>*) #(<pattern>*) | |
2134 | ||
2135 | (let () | |
2136 | ||
2137 | (define match-each | |
d2b61fe0 | 2138 | (lambda (e p w mod) |
a63812a2 | 2139 | (cond |
b40d0230 AW |
2140 | ((pair? e) |
2141 | (let ((first (match (car e) p w '() mod))) | |
2142 | (and first | |
2143 | (let ((rest (match-each (cdr e) p w mod))) | |
2144 | (and rest (cons first rest)))))) | |
2145 | ((null? e) '()) | |
2146 | ((syntax-object? e) | |
2147 | (match-each (syntax-object-expression e) | |
2148 | p | |
2149 | (join-wraps w (syntax-object-wrap e)) | |
2150 | (syntax-object-module e))) | |
2151 | (else #f)))) | |
a63812a2 JB |
2152 | |
2153 | (define match-each-any | |
d2b61fe0 | 2154 | (lambda (e w mod) |
a63812a2 | 2155 | (cond |
b40d0230 AW |
2156 | ((pair? e) |
2157 | (let ((l (match-each-any (cdr e) w mod))) | |
2158 | (and l (cons (wrap (car e) w mod) l)))) | |
2159 | ((null? e) '()) | |
2160 | ((syntax-object? e) | |
2161 | (match-each-any (syntax-object-expression e) | |
2162 | (join-wraps w (syntax-object-wrap e)) | |
2163 | mod)) | |
2164 | (else #f)))) | |
a63812a2 JB |
2165 | |
2166 | (define match-empty | |
2167 | (lambda (p r) | |
2168 | (cond | |
2169 | ((null? p) r) | |
2170 | ((eq? p 'any) (cons '() r)) | |
2171 | ((pair? p) (match-empty (car p) (match-empty (cdr p) r))) | |
2172 | ((eq? p 'each-any) (cons '() r)) | |
2173 | (else | |
2174 | (case (vector-ref p 0) | |
2175 | ((each) (match-empty (vector-ref p 1) r)) | |
2176 | ((free-id atom) r) | |
2177 | ((vector) (match-empty (vector-ref p 1) r))))))) | |
2178 | ||
2179 | (define match* | |
d2b61fe0 | 2180 | (lambda (e p w r mod) |
a63812a2 JB |
2181 | (cond |
2182 | ((null? p) (and (null? e) r)) | |
2183 | ((pair? p) | |
2184 | (and (pair? e) (match (car e) (car p) w | |
d2b61fe0 AW |
2185 | (match (cdr e) (cdr p) w r mod) |
2186 | mod))) | |
a63812a2 | 2187 | ((eq? p 'each-any) |
d2b61fe0 | 2188 | (let ((l (match-each-any e w mod))) (and l (cons l r)))) |
a63812a2 JB |
2189 | (else |
2190 | (case (vector-ref p 0) | |
2191 | ((each) | |
2192 | (if (null? e) | |
2193 | (match-empty (vector-ref p 1) r) | |
d2b61fe0 | 2194 | (let ((l (match-each e (vector-ref p 1) w mod))) |
a63812a2 JB |
2195 | (and l |
2196 | (let collect ((l l)) | |
2197 | (if (null? (car l)) | |
2198 | r | |
2199 | (cons (map car l) (collect (map cdr l))))))))) | |
d2b61fe0 | 2200 | ((free-id) (and (id? e) (free-id=? (wrap e w mod) (vector-ref p 1)) r)) |
a63812a2 JB |
2201 | ((atom) (and (equal? (vector-ref p 1) (strip e w)) r)) |
2202 | ((vector) | |
2203 | (and (vector? e) | |
d2b61fe0 | 2204 | (match (vector->list e) (vector-ref p 1) w r mod)))))))) |
a63812a2 JB |
2205 | |
2206 | (define match | |
d2b61fe0 | 2207 | (lambda (e p w r mod) |
a63812a2 JB |
2208 | (cond |
2209 | ((not r) #f) | |
d2b61fe0 | 2210 | ((eq? p 'any) (cons (wrap e w mod) r)) |
a63812a2 JB |
2211 | ((syntax-object? e) |
2212 | (match* | |
b40d0230 AW |
2213 | (syntax-object-expression e) |
2214 | p | |
2215 | (join-wraps w (syntax-object-wrap e)) | |
2216 | r | |
2217 | (syntax-object-module e))) | |
2218 | (else (match* e p w r mod))))) | |
a63812a2 | 2219 | |
5f1a2fb1 | 2220 | (set! $sc-dispatch |
a63812a2 JB |
2221 | (lambda (e p) |
2222 | (cond | |
2223 | ((eq? p 'any) (list e)) | |
2224 | ((syntax-object? e) | |
b40d0230 AW |
2225 | (match* (syntax-object-expression e) |
2226 | p (syntax-object-wrap e) '() (syntax-object-module e))) | |
2227 | (else (match* e p empty-wrap '() #f))))) | |
80f225df | 2228 | |
a63812a2 JB |
2229 | )) |
2230 | ) | |
2231 | ||
2232 | (define-syntax with-syntax | |
2233 | (lambda (x) | |
2234 | (syntax-case x () | |
2235 | ((_ () e1 e2 ...) | |
2236 | (syntax (begin e1 e2 ...))) | |
2237 | ((_ ((out in)) e1 e2 ...) | |
2238 | (syntax (syntax-case in () (out (begin e1 e2 ...))))) | |
2239 | ((_ ((out in) ...) e1 e2 ...) | |
2240 | (syntax (syntax-case (list in ...) () | |
2241 | ((out ...) (begin e1 e2 ...)))))))) | |
2242 | ||
2243 | (define-syntax syntax-rules | |
2244 | (lambda (x) | |
2245 | (syntax-case x () | |
2246 | ((_ (k ...) ((keyword . pattern) template) ...) | |
2247 | (syntax (lambda (x) | |
2248 | (syntax-case x (k ...) | |
2249 | ((dummy . pattern) (syntax template)) | |
2250 | ...))))))) | |
2251 | ||
2252 | (define-syntax let* | |
2253 | (lambda (x) | |
2254 | (syntax-case x () | |
2255 | ((let* ((x v) ...) e1 e2 ...) | |
4d248541 | 2256 | (and-map identifier? (syntax (x ...))) |
a63812a2 JB |
2257 | (let f ((bindings (syntax ((x v) ...)))) |
2258 | (if (null? bindings) | |
2259 | (syntax (let () e1 e2 ...)) | |
2260 | (with-syntax ((body (f (cdr bindings))) | |
2261 | (binding (car bindings))) | |
2262 | (syntax (let (binding) body))))))))) | |
2263 | ||
2264 | (define-syntax do | |
2265 | (lambda (orig-x) | |
2266 | (syntax-case orig-x () | |
2267 | ((_ ((var init . step) ...) (e0 e1 ...) c ...) | |
2268 | (with-syntax (((step ...) | |
2269 | (map (lambda (v s) | |
2270 | (syntax-case s () | |
2271 | (() v) | |
2272 | ((e) (syntax e)) | |
e4721dde AW |
2273 | (_ (syntax-violation |
2274 | 'do "bad step expression" | |
2275 | orig-x s)))) | |
a63812a2 JB |
2276 | (syntax (var ...)) |
2277 | (syntax (step ...))))) | |
2278 | (syntax-case (syntax (e1 ...)) () | |
2279 | (() (syntax (let doloop ((var init) ...) | |
2280 | (if (not e0) | |
2281 | (begin c ... (doloop step ...)))))) | |
2282 | ((e1 e2 ...) | |
2283 | (syntax (let doloop ((var init) ...) | |
2284 | (if e0 | |
2285 | (begin e1 e2 ...) | |
2286 | (begin c ... (doloop step ...)))))))))))) | |
2287 | ||
2288 | (define-syntax quasiquote | |
2289 | (letrec | |
2290 | ((quasicons | |
2291 | (lambda (x y) | |
2292 | (with-syntax ((x x) (y y)) | |
2293 | (syntax-case (syntax y) (quote list) | |
2294 | ((quote dy) | |
2295 | (syntax-case (syntax x) (quote) | |
2296 | ((quote dx) (syntax (quote (dx . dy)))) | |
2297 | (_ (if (null? (syntax dy)) | |
2298 | (syntax (list x)) | |
2299 | (syntax (cons x y)))))) | |
2300 | ((list . stuff) (syntax (list x . stuff))) | |
2301 | (else (syntax (cons x y))))))) | |
2302 | (quasiappend | |
2303 | (lambda (x y) | |
2304 | (with-syntax ((x x) (y y)) | |
2305 | (syntax-case (syntax y) (quote) | |
2306 | ((quote ()) (syntax x)) | |
2307 | (_ (syntax (append x y))))))) | |
2308 | (quasivector | |
2309 | (lambda (x) | |
2310 | (with-syntax ((x x)) | |
2311 | (syntax-case (syntax x) (quote list) | |
2312 | ((quote (x ...)) (syntax (quote #(x ...)))) | |
2313 | ((list x ...) (syntax (vector x ...))) | |
2314 | (_ (syntax (list->vector x))))))) | |
2315 | (quasi | |
2316 | (lambda (p lev) | |
2317 | (syntax-case p (unquote unquote-splicing quasiquote) | |
2318 | ((unquote p) | |
2319 | (if (= lev 0) | |
2320 | (syntax p) | |
2321 | (quasicons (syntax (quote unquote)) | |
2322 | (quasi (syntax (p)) (- lev 1))))) | |
40b36cfb AW |
2323 | ((unquote . args) |
2324 | (= lev 0) | |
2325 | (syntax-violation 'unquote | |
2326 | "unquote takes exactly one argument" | |
2327 | p (syntax (unquote . args)))) | |
a63812a2 JB |
2328 | (((unquote-splicing p) . q) |
2329 | (if (= lev 0) | |
2330 | (quasiappend (syntax p) (quasi (syntax q) lev)) | |
2331 | (quasicons (quasicons (syntax (quote unquote-splicing)) | |
2332 | (quasi (syntax (p)) (- lev 1))) | |
2333 | (quasi (syntax q) lev)))) | |
40b36cfb AW |
2334 | (((unquote-splicing . args) . q) |
2335 | (= lev 0) | |
2336 | (syntax-violation 'unquote-splicing | |
2337 | "unquote-splicing takes exactly one argument" | |
2338 | p (syntax (unquote-splicing . args)))) | |
a63812a2 JB |
2339 | ((quasiquote p) |
2340 | (quasicons (syntax (quote quasiquote)) | |
2341 | (quasi (syntax (p)) (+ lev 1)))) | |
2342 | ((p . q) | |
2343 | (quasicons (quasi (syntax p) lev) (quasi (syntax q) lev))) | |
2344 | (#(x ...) (quasivector (quasi (syntax (x ...)) lev))) | |
2345 | (p (syntax (quote p))))))) | |
2346 | (lambda (x) | |
2347 | (syntax-case x () | |
2348 | ((_ e) (quasi (syntax e) 0)))))) | |
2349 | ||
2350 | (define-syntax include | |
2351 | (lambda (x) | |
2352 | (define read-file | |
2353 | (lambda (fn k) | |
2354 | (let ((p (open-input-file fn))) | |
2355 | (let f ((x (read p))) | |
2356 | (if (eof-object? x) | |
2357 | (begin (close-input-port p) '()) | |
22225fc1 | 2358 | (cons (datum->syntax k x) |
a63812a2 JB |
2359 | (f (read p)))))))) |
2360 | (syntax-case x () | |
2361 | ((k filename) | |
22225fc1 | 2362 | (let ((fn (syntax->datum (syntax filename)))) |
a63812a2 JB |
2363 | (with-syntax (((exp ...) (read-file fn (syntax k)))) |
2364 | (syntax (begin exp ...)))))))) | |
2365 | ||
2366 | (define-syntax unquote | |
6a952e0e AW |
2367 | (lambda (x) |
2368 | (syntax-case x () | |
2369 | ((_ e) | |
2370 | (syntax-violation 'unquote | |
2371 | "expression not valid outside of quasiquote" | |
2372 | x))))) | |
a63812a2 JB |
2373 | |
2374 | (define-syntax unquote-splicing | |
6a952e0e AW |
2375 | (lambda (x) |
2376 | (syntax-case x () | |
2377 | ((_ e) | |
2378 | (syntax-violation 'unquote-splicing | |
2379 | "expression not valid outside of quasiquote" | |
2380 | x))))) | |
a63812a2 JB |
2381 | |
2382 | (define-syntax case | |
2383 | (lambda (x) | |
2384 | (syntax-case x () | |
2385 | ((_ e m1 m2 ...) | |
2386 | (with-syntax | |
2387 | ((body (let f ((clause (syntax m1)) (clauses (syntax (m2 ...)))) | |
2388 | (if (null? clauses) | |
2389 | (syntax-case clause (else) | |
2390 | ((else e1 e2 ...) (syntax (begin e1 e2 ...))) | |
2391 | (((k ...) e1 e2 ...) | |
2392 | (syntax (if (memv t '(k ...)) (begin e1 e2 ...)))) | |
e4721dde | 2393 | (_ (syntax-violation 'case "bad clause" x clause))) |
a63812a2 JB |
2394 | (with-syntax ((rest (f (car clauses) (cdr clauses)))) |
2395 | (syntax-case clause (else) | |
2396 | (((k ...) e1 e2 ...) | |
2397 | (syntax (if (memv t '(k ...)) | |
2398 | (begin e1 e2 ...) | |
2399 | rest))) | |
e4721dde AW |
2400 | (_ (syntax-violation 'case "bad clause" x |
2401 | clause)))))))) | |
a63812a2 JB |
2402 | (syntax (let ((t e)) body))))))) |
2403 | ||
2404 | (define-syntax identifier-syntax | |
2405 | (lambda (x) | |
2406 | (syntax-case x () | |
2407 | ((_ e) | |
2408 | (syntax | |
2409 | (lambda (x) | |
2410 | (syntax-case x () | |
2411 | (id | |
2412 | (identifier? (syntax id)) | |
2413 | (syntax e)) | |
2414 | ((_ x (... ...)) | |
2415 | (syntax (e x (... ...))))))))))) |