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;;; doc.scm -- procedures providing documentation on scheme objects
;; 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 Feb 08, 2009 18:44
(define-module (geiser doc)
#:export (autodoc
symbol-documentation
object-signature)
#:use-module (geiser utils)
#:use-module (geiser modules)
#:use-module (system vm program)
#:use-module (ice-9 session)
#:use-module (ice-9 documentation)
#:use-module (ice-9 regex)
#:use-module (oop goops)
#:use-module (srfi srfi-1))
(define (autodoc ids)
(if (not (list? ids))
'()
(map (lambda (id) (or (autodoc* id) (list id))) ids)))
(define (autodoc* id)
(let ((args (obj-args (symbol->object id))))
(and args
`(,@(signature id args)
(module . ,(symbol-module id))))))
(define (object-signature name obj)
(let ((args (obj-args obj)))
(and args (signature name args))))
(define (signature id args)
(define (arglst kind)
(let ((args (assq-ref args kind)))
(cond ((or (not args) (null? args)) '())
((list? args) args)
(else (list args)))))
`(,id
(args ,@(if (list? args)
`(((required ,@(arglst 'required))
(optional ,@(arglst 'optional)
,@(let ((rest (assq-ref args 'rest)))
(if rest (list "...") '())))
(key ,@(arglst 'keyword))))
'()))))
(define (obj-args obj)
(cond ((not obj) #f)
((or (procedure? obj) (program? obj)) (arguments obj))
((macro? obj) (or (obj-args (macro-transformer obj)) '((required ...))))
(else 'variable)))
(define (arguments proc)
(cond
((is-a? proc <generic>) (generic-args proc))
((procedure-property proc 'arglist) => arglist->args)
((procedure-source proc) => source->args)
((program? proc) ((@ (system vm program) program-arguments) proc))
((doc->args proc))
((procedure-property proc 'arity) => arity->args)
(else #f)))
(define (source->args src)
(let ((formals (cadr src)))
(cond ((list? formals) `((required . ,formals)))
((pair? formals)
`((required . ,(car formals)) (rest . ,(cdr formals))))
(else #f))))
(define (arity->args art)
(let ((req (car art))
(opt (cadr art))
(rest (caddr art)))
`(,@(if (> req 0) (list (cons 'required (gen-arg-names 1 req))) '())
,@(if (> opt 0) (list (cons 'optional (gen-arg-names (+ 1 req) opt))) '())
,@(if rest (list (cons 'rest 'rest)) '()))))
(define (gen-arg-names fst count)
(let* ((letts (list->vector '(#\x #\y #\z #\u #\v #\w #\t)))
(len (vector-length letts))
(lett (lambda (n) (vector-ref letts (modulo n len)))))
(map (lambda (n) (string->symbol (format "~A" (lett (- n 1)))))
(iota (max count 1) fst))))
(define (arglist->args arglist)
`((required . ,(car arglist))
(optional . ,(cadr arglist))
(keyword . ,(caddr arglist))
(rest . ,(car (cddddr arglist)))))
(define (doc->args proc)
(define proc-rx "-- Scheme Procedure: ([^[\n]+)\n")
(define proc-rx2 "-- Scheme Procedure: ([^[\n]+\\[[^\n]*(\n[^\n]+\\]+)?)")
(cond ((procedure-property proc 'geiser-document-args))
((object-documentation proc)
=> (lambda (doc)
(let* ((match (or (string-match proc-rx doc)
(string-match proc-rx2 doc)))
(args (and match
(parse-signature-string (match:substring match 1)))))
(set-procedure-property! proc 'geiser-document-args args)
args)))
(else #f)))
(define (parse-signature-string str)
(define opt-arg-rx "\\[([^] ]+)\\]?")
(define opt-arg-rx2 "([^ ])+\\]+")
(let ((tokens (string-tokenize str)))
(if (< (length tokens) 2)
'()
(let loop ((tokens (cdr tokens)) (req '()) (opt '()) (rest #f))
(cond ((null? tokens)
`((required ,@(map string->symbol (reverse! req)))
(optional ,@(map string->symbol (reverse! opt)))
,@(if rest
(list (cons 'rest (string->symbol rest)))
'())))
((string=? "." (car tokens))
(if (not (null? (cdr tokens)))
(loop (cddr tokens) req opt (cadr tokens))
(loop '() req opt "rest")))
((or (string-match opt-arg-rx (car tokens))
(string-match opt-arg-rx2 (car tokens)))
=> (lambda (m)
(loop (cdr tokens)
req
(cons (match:substring m 1) opt)
rest)))
(else (loop (cdr tokens) (cons (car tokens) req) opt rest)))))))
(define (generic-args gen)
(define (src> src1 src2)
(> (length (cadr src1)) (length (cadr src2))))
(define (src m)
(catch #t
(lambda () (method-source m))
(lambda (k . a) #f)))
(let* ((methods (generic-function-methods gen))
(srcs (filter identity (map src methods))))
(cond ((and (null? srcs) (null? methods)) '((rest . rest)))
((and (null? srcs)
(not (null? methods))
(method-procedure (car methods)))
=> arguments)
((not (null? srcs)) (source->args (car (sort! srcs src>))))
(else '((rest . rest))))))
(define (symbol-documentation sym)
(let ((obj (symbol->object sym)))
(if obj
`((signature . ,(or (obj-signature sym obj) sym))
(docstring . ,(docstring sym obj))))))
(define (docstring sym obj)
(with-output-to-string
(lambda ()
(let* ((type (cond ((macro? obj) "A macro")
((procedure? obj) "A procedure")
((program? obj) "A compiled program")
(else "An object")))
(modname (symbol-module sym))
(doc (object-documentation obj)))
(display type)
(if modname
(begin
(display " in module ")
(display modname)))
(newline)
(if doc (display doc))))))
(define (obj-signature sym obj)
(let ((args (obj-args obj)))
(and args (signature sym args))))
;;; doc.scm ends here
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