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;;; autodoc.ss -- suport for autodoc echo
;; Copyright (C) 2009 Jose Antonio Ortega Ruiz
;; This program is free software; you can redistribute it and/or
;; modify it under the terms of the Modified BSD License. You should
;; have received a copy of the license along with this program. If
;; not, see <http://www.xfree86.org/3.3.6/COPYRIGHT2.html#5>.
;; Start date: Sun May 03, 2009 14:45
#lang scheme
(provide autodoc update-module-cache get-help)
(require geiser/utils geiser/modules geiser/locations scheme/help)
(define (get-help symbol mod)
(with-handlers ((exn? (lambda (e)
(eval `(help ,symbol #:from ,mod)))))
(eval `(help ,symbol))))
(define (autodoc ids)
(if (not (list? ids))
'()
(map (lambda (id) (or (autodoc* id) (list id))) ids)))
(define (autodoc* id)
(and
(symbol? id)
(let* ((loc (symbol-location* id))
(name (car loc))
(path (cdr loc))
(sgn (and path (find-signature path name id))))
(and sgn
`(,id
(name . ,name)
(args ,@(format-signature sgn))
(module . ,(module-path-name->name path)))))))
(define (format-signature sign)
(if (signature? sign)
`((required ,@(signature-required sign))
(optional ,@(signature-optional sign)
,@(let ((rest (signature-rest sign)))
(if rest (list "...") '())))
(key ,@(signature-keys sign)))
'()))
(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 (list name formals ...) other ...) body ...)
(add-signature! name formals store))
((list 'define name (list 'lambda formals body ...))
(add-signature! name formals store))
((list 'define (list name formals ...) body ...)
(add-signature! name formals store))
((list 'define-for-syntax (list name formals ...) body ...)
(add-signature! name formals store))
((list 'define-for-syntax 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 (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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