1 ;;; autodoc.rkt -- suport for autodoc echo
3 ;; Copyright (C) 2009, 2010, 2011, 2012 Jose Antonio Ortega Ruiz
5 ;; This program is free software; you can redistribute it and/or
6 ;; modify it under the terms of the Modified BSD License. You should
7 ;; have received a copy of the license along with this program. If
8 ;; not, see <http://www.xfree86.org/3.3.6/COPYRIGHT2.html#5>.
10 ;; Start date: Sun May 03, 2009 14:45
17 update-signature-cache
25 (define (get-help symbol mod)
28 (with-handlers ([exn? (lambda (_)
29 (eval `(help ,symbol)))])
30 (eval `(help ,symbol #:from ,(ensure-module-spec mod))))))
32 (define (get-mod-help mod)
33 (let-values ([(ids syns) (module-identifiers mod)])
34 (let ([sym (cond [(not (null? syns)) (car syns)]
35 [(not (null? ids)) (car ids)]
37 (and sym (get-help sym mod)))))
39 (define (symbol-documentation sym)
40 (let* ([val (value sym (symbol-module sym))]
41 [sign (autodoc* sym)])
43 (list (cons "signature" (autodoc* sym #f))
44 (cons "docstring" (docstring sym val sign))))))
46 (define (docstring sym val sign)
47 (let* ([mod (assoc "module" (cdr sign))]
48 [mod (if mod (cdr mod) "<unknown>")]
49 [id (namespace-symbol->identifier sym)]
50 [desc (if (identifier? id) (format "~%~%~a" (describe id sym)) "")])
52 (format "A ~a in module ~a.~a~a~a"
53 (if (procedure? val) "procedure" "variable")
57 (format "~%~%Value:~%~% ~a" val))
58 (if (has-contract? val)
59 (format "~%~%Contract:~%~% ~a"
60 (contract-name (value-contract val)))
63 (format "An identifier in module ~a.~a" mod desc))))
65 ;; Lifted from Eli's interactive.rkt
66 (define (describe id s)
67 (define b (identifier-binding id))
69 [(not b) (format "`~s' is a toplevel (or unbound) identifier." s)]
70 [(eq? b 'lexical) (format "`~s' is a lexical identifier." s)]
71 [(or (not (list? b)) (not (= 7 (length b))))
72 "*** internal error, racket changed ***"]
74 (let-values ([(source-mod source-id
75 nominal-source-mod nominal-source-id
76 source-phase import-phase
79 (let ([aliased (not (eq? s source-id))]
80 [for-syn (eqv? source-phase 1)]
81 [amod (not (equal? source-mod nominal-source-mod))]
82 [aid (not (eq? s nominal-source-id))])
83 (if (or aliased for-syn amod aid)
86 (if for-syn " for syntax" "")
87 (if aliased (format " as `~s' " source-id) "")
89 (format " in module ~a\nand required~a in module ~a"
90 (module-path-index->name source-mod)
91 (if (eqv? import-phase 1) "-for-syntax" "")
92 (module-path-index->name nominal-source-mod))
95 (format ",\nwhere it is defined as `~s'" nominal-source-id)
100 (define (value id mod)
101 (with-handlers ([exn? (const #f)])
102 (dynamic-require mod id (const #f))))
104 (define (autodoc ids)
105 (map (lambda (id) (or (autodoc* id) (list id)))
106 (if (list? ids) ids '())))
108 (define (autodoc* id (extra #t))
110 (with-handlers ([exn? (const "")])
111 (parameterize ([error-print-width 60])
112 (format "~.a" (namespace-variable-value id)))))
115 (let* ([loc (symbol-location* id)]
118 [sgns (and path (find-signatures path name id))]
119 [value (if (and extra sgns (not (list? sgns)))
120 (list (cons "value" (val)))
122 [mod (if (and extra sgns path)
124 (module-path-name->name path)))
129 ("args" ,@(if (list? sgns) (map format-signature sgns) '()))
133 (define (format-signature sign)
134 (if (signature? sign)
135 `(("required" ,@(signature-required sign))
136 ("optional" ,@(signature-optional sign)
137 ,@(let ((rest (signature-rest sign)))
138 (if rest (list "...") '())))
139 ("key" ,@(signature-keys sign)))
142 (define signatures (make-hash))
144 (struct signature (required optional keys rest))
146 (define (find-signatures path name local-name)
147 (let ([path (if (path? path) (path->string path) path)])
148 (hash-ref! (hash-ref! signatures
150 (lambda () (parse-signatures path)))
152 (lambda () (infer-signatures local-name)))))
154 (define (parse-signatures path)
155 (let ([result (make-hasheq)])
156 (with-handlers ([exn? (lambda (e) result)])
157 (with-input-from-file path
159 (parameterize ([read-accept-reader #t])
160 (let loop ([stx (read-syntax path)])
161 (cond [(eof-object? stx) void]
162 [(syntax->datum stx) =>
164 (parse-datum! datum result)
165 (loop (read-syntax path)))]
169 (define (parse-datum! datum store)
170 (with-handlers ([exn? (lambda (_) void)])
172 [`(module ,name ,lang (#%module-begin . ,forms))
173 (for-each (lambda (f) (parse-datum! f store)) forms)]
174 [`(module ,name ,lang . ,forms)
175 (for-each (lambda (f) (parse-datum! f store)) forms)]
176 [`(define ((,name . ,formals) . ,_) . ,_)
177 (add-signature! name formals store)]
178 [`(define (,name . ,formals) . ,_)
179 (add-signature! name formals store)]
180 [`(define ,name (lambda ,formals . ,_))
181 (add-signature! name formals store)]
182 [`(define ,name (case-lambda ,clauses ...))
183 (for-each (lambda (c) (add-signature! name (car c) store))
185 [`(,(or 'struct 'define-struct) ,name ,(? symbol? _)
186 ,(list formals ...) . ,_)
187 (add-signature! name formals store)]
188 [`(,(or 'struct 'define-struct) ,name ,(list formals ...) . ,_)
189 (add-signature! name formals store)]
190 [`(define-for-syntax (,name . ,formals) . ,_)
191 (add-signature! name formals store)]
192 [`(define-for-syntax ,name (lambda ,formals . ,_))
193 (add-signature! name formals store)]
194 [`(define-syntax-rule (,name . ,formals) . ,_)
195 (add-signature! name formals store)]
196 [`(define-syntax ,name (syntax-rules ,specials . ,clauses))
197 (for-each (lambda (c) (add-syntax-signature! name (cdar c) store))
199 [`(define-syntax ,name (lambda ,_ (syntax-case ,_ . ,clauses)))
200 (for-each (lambda (c) (add-syntax-signature! name (cdar c) store))
202 [`(define-type ,_ . ,cases)
203 (for-each (lambda (c) (add-signature! (car c) (cdr c) store)) cases)]
206 (define (add-signature! name formals store)
210 (cons (parse-formals formals)
211 (hash-ref store name '())))))
213 (define (add-syntax-signature! name formals store)
217 (cons (signature formals '() '() #f)
218 (hash-ref store name '())))))
220 (define (parse-formals formals)
221 (let loop ([formals formals] [req '()] [opt '()] [keys '()])
222 (cond [(null? formals)
223 (signature (reverse req) (reverse opt) (reverse keys) #f)]
225 (signature (reverse req) (reverse opt) (reverse keys) formals)]
226 [(pair? (car formals)) (loop (cdr formals)
228 (cons (car formals) opt)
230 [(keyword? (car formals)) (let* ((kname (car formals))
231 (arg-id (cadr formals))
232 (name (if (pair? arg-id)
240 [else (loop (cdr formals) (cons (car formals) req) opt keys)])))
242 (define (infer-signatures name)
243 (with-handlers ([exn:fail:syntax? (const `(,(signature '(...) '() '() #f)))]
244 [exn:fail:contract:variable? (const #f)])
245 (let ([v (namespace-variable-value name)])
247 (arity->signatures (procedure-arity v))
250 (define (arity->signatures arity)
251 (define (args count) (build-list count (const '_)))
252 (define (arity->signature arity)
253 (cond [(number? arity)
254 (signature (args arity) '() '() #f)]
255 [(arity-at-least? arity)
256 (signature (args (arity-at-least-value arity)) '() '() 'rest)]))
257 (define (conseq? lst)
258 (cond [(< (length lst) 2) (number? (car lst))]
259 [(and (number? (car lst))
261 (eqv? (+ 1 (car lst)) (cadr lst)))
264 (cond [(and (list? arity) (conseq? arity))
265 (let ((mi (apply min arity))
266 (ma (apply max arity)))
267 (list (signature (args mi) (args (- ma mi)) '() #f)))]
268 [(list? arity) (map arity->signature arity)]
269 [else (list (arity->signature arity))]))
271 (define (update-signature-cache path (form #f))
272 (when (and (string? path)
277 '(define-syntax-rule struct
278 define-syntax define set! define-struct)))))
279 (hash-remove! signatures path)))
281 (define (module-exports mod)
282 (define (contracted id)
283 (let ([v (value id mod)])
284 (if (has-contract? v)
285 (list id (cons "info" (contract-name (value-contract v))))
288 (let ((sign (eval `(,autodoc* ',id #f)
289 (module-spec->namespace mod #f #f))))
290 (if sign (list id (cons "signature" sign)) (list id))))
291 (define (classify-ids ids)
292 (let loop ([ids ids] [procs '()] [vars '()])
294 `(("procs" ,@(map entry (reverse procs)))
295 ("vars" ,@(map list (reverse vars))))]
296 [(procedure? (value (car ids) mod))
297 (loop (cdr ids) (cons (car ids) procs) vars)]
298 [else (loop (cdr ids) procs (cons (car ids) vars))])))
299 (let-values ([(ids syn) (module-identifiers mod)])
300 `(,@(classify-ids ids)
301 ("syntax" ,@(map contracted syn))
302 ("modules" ,@(map list (or (submodules mod) '()))))))