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;; autodoc.ss -- support for autodoc
;; Copyright (C) 2009 Jose Antonio Ortega Ruiz
;; Author: Jose Antonio Ortega Ruiz <jao@gnu.org>
;; Start date: Sun May 03, 2009 14:45
;; This file is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 3 of the License, or
;; (at your option) any later version.
;; This file is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with this program. If not, see <http://www.gnu.org/licenses/>.
;;; Code:
#lang scheme
(provide autodoc update-module-cache)
(require geiser/utils geiser/modules geiser/locations)
(define (autodoc form)
(cond ((null? form) #f)
((symbol? form) (describe-application (list form)))
((not (pair? form)) #f)
((not (list? form)) (autodoc (pair->list form)))
((define-head? form) => autodoc)
(else (autodoc/list form))))
(define (autodoc/list form)
(let ((lst (last form)))
(cond ((and (symbol? lst) (describe-application (list lst))))
((and (pair? lst) (not (memq (car lst) '(quote))) (autodoc lst)))
(else (describe-application form)))))
(define (define-head? form)
(define defforms '(-define
define define-values
define-method define-class define-generic define-struct
define-syntax define-syntaxes -define-syntax))
(and (= 2 (length form))
(memq (car form) defforms)
(car form)))
(define (describe-application form)
(let* ((fun (car form))
(loc (symbol-location* fun))
(name (car loc))
(path (cdr loc))
(sgn (and path (find-signature path name fun))))
(and sgn
(list (cons 'signature (format-signature fun sgn))
(cons 'position (find-position sgn form))
(cons 'module (module-path-name->name path))))))
(define signatures (make-hash))
(define-struct signature (required optional keys rest))
(define (find-signature path name local-name)
(let ((path (if (path? path) (path->string path) path)))
(hash-ref! (hash-ref! signatures
path
(lambda () (parse-signatures path)))
name
(lambda () (infer-signature local-name)))))
(define (parse-signatures path)
(let ((result (make-hasheq)))
(with-handlers ((exn? (lambda (e) result)))
(with-input-from-file path
(lambda ()
(parameterize ((read-accept-reader #t))
(let loop ((stx (read-syntax path)))
(cond ((eof-object? stx) void)
((syntax->datum stx) =>
(lambda (datum)
(parse-datum! datum result)
(loop (read-syntax path))))
(else void)))))))
result))
(define (parse-datum! datum store)
(match datum
((list 'module name lang forms ...)
(for-each (lambda (f) (parse-datum! f store)) forms))
((list 'define (list name formals ...) body ...)
(add-signature! name formals store))
((list 'define name (list 'lambda formals body ...))
(add-signature! name formals store))
((list 'define-syntax-rule (list name formals ...) body ...)
(add-signature! name formals store))
(_ void)))
(define (add-signature! name formals store)
(hash-set! store name (parse-formals formals)))
(define (parse-formals formals)
(let loop ((formals formals) (req '()) (opt '()) (keys '()))
(cond ((null? formals)
(make-signature (reverse req) (reverse opt) (reverse keys) #f))
((symbol? formals)
(make-signature (reverse req) (reverse opt) (reverse keys) formals))
((pair? (car formals)) (loop (cdr formals)
req
(cons (car formals) opt)
keys))
((keyword? (car formals)) (let* ((kname (keyword->symbol (car formals)))
(arg-id (cadr formals))
(name (if (pair? arg-id)
(list kname (cadr arg-id))
kname)))
(loop (cddr formals)
req
opt
(cons name keys))))
(else (loop (cdr formals) (cons (car formals) req) opt keys)))))
(define (infer-signature name)
(define syntax-tag (cons 1 0))
(define error-tag (cons 1 1))
(define generic-signature (make-signature '(...) '() '() #f))
(let ((value (with-handlers ((exn:fail:syntax? (lambda (_) syntax-tag))
(exn:fail:contract:variable? (lambda (_) error-tag)))
(namespace-variable-value name))))
(cond ((procedure? value)
(arity->signature (procedure-arity value)))
((eq? value syntax-tag) generic-signature)
((eq? value error-tag) #f)
(else 'variable))))
(define (arity->signature arity)
(define (args fst count)
(let* ((letts (list->vector '(#\x #\y #\z #\u #\v #\w #\r #\s)))
(len (vector-length letts))
(lett (lambda (n) (vector-ref letts (modulo n len)))))
(map (lambda (n) (string->symbol (format "~a" (lett n))))
(build-list count (lambda (n) (+ n fst))))))
(cond ((number? arity)
(make-signature (args 0 arity) '() '() #f))
((arity-at-least? arity)
(make-signature (args 0 (arity-at-least-value arity)) '() '() 'rest))
(else
(let* ((arg-nos (map (lambda (a)
(if (number? a) a (arity-at-least-value a)))
arity))
(min-val (apply min arg-nos))
(max-val (apply max arg-nos))
(opt-no (- max-val min-val)))
(make-signature (args 0 min-val) (args min-val opt-no) '() #f)))))
(define (format-signature fun sign)
(cond ((symbol? sign) (cons fun sign))
((signature? sign)
(let ((req (signature-required sign))
(opt (signature-optional sign))
(keys (signature-keys sign))
(rest (signature-rest sign)))
`(,fun
,@req
,@(if (null? opt) opt (cons '#:opt opt))
,@(if (null? keys) keys (cons '#:key keys))
,@(if rest (list '#:rest rest) '()))))
(else #f)))
(define (find-position sign form)
(if (signature? sign)
(let* ((lf (length form))
(lf-1 (- lf 1)))
(if (= 1 lf) 0
(let ((req (length (signature-required sign)))
(opt (length (signature-optional sign)))
(keys (map (lambda (k) (symbol->keyword (if (list? k) (car k) k)))
(signature-keys sign)))
(rest (signature-rest sign)))
(cond ((<= lf (+ 1 req)) lf-1)
((<= lf (+ 1 req opt)) (if (> opt 0) lf lf-1))
((or (memq (last form) keys)
(memq (car (take-right form 2)) keys)) =>
(lambda (sl)
(+ 2 req
(if (> opt 0) (+ 1 opt) 0)
(- (length keys) (length sl)))))
(else (+ 1 req
(if (> opt 0) (+ 1 opt) 0)
(if (null? keys) 0 (+ 1 (length keys)))
(if rest 2 0)))))))
0))
(define (update-module-cache path . form)
(when (and (string? path)
(or (null? form)
(and (list? (car form))
(not (null? (car form)))
(memq (caar form)
'(define-syntax-rule
define-syntax define set! define-struct)))))
(hash-remove! signatures path)))
;;; autodoc.ss ends here
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