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;;; utils.scm
;;;
;;; Copyright 2003, 2004 Manuel Serrano
;;; Copyright 2005 Ludovic Court�s <ludovic.courtes@laas.fr>
;;;
;;;
;;; This program 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 2 of the License, or
;;; (at your option) any later version.
;;;
;;; This program 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, write to the Free Software
;;; Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
;;; USA.
(define-skribe-module (skribilo skribe utils)
#:export (ast-document))
;;; Author: Manuel Serrano
;;; Commentary:
;;;
;;; A library of various utilities, including AST traversal helper functions.
;;;
;;; Code:
;;; The contents of the file below are unchanged compared to Skribe 1.2d's
;;; `lib.scm' file found in the `common' directory.
;*---------------------------------------------------------------------*/
;* engine-custom-add! ... */
;*---------------------------------------------------------------------*/
(define (engine-custom-add! e id val)
(let ((old (engine-custom e id)))
(if (unspecified? old)
(engine-custom-set! e id (list val))
(engine-custom-set! e id (cons val old)))))
;*---------------------------------------------------------------------*/
;* find-markup-ident ... */
;*---------------------------------------------------------------------*/
(define (find-markup-ident ident)
(let ((r (find-markups ident)))
(if (or (pair? r) (null? r))
r
'())))
;*---------------------------------------------------------------------*/
;* container-search-down ... */
;*---------------------------------------------------------------------*/
(define (container-search-down pred obj)
(with-debug 4 'container-search-down
(debug-item "obj=" (find-runtime-type obj))
(let loop ((obj (markup-body obj)))
(cond
((pair? obj)
(apply append (map (lambda (o) (loop o)) obj)))
((container? obj)
(let ((rest (loop (markup-body obj))))
(if (pred obj)
(cons obj rest)
rest)))
((pred obj)
(list obj))
(else
'())))))
;*---------------------------------------------------------------------*/
;* search-down ... */
;*---------------------------------------------------------------------*/
(define (search-down pred obj)
(with-debug 4 'search-down
(debug-item "obj=" (find-runtime-type obj))
(let loop ((obj (markup-body obj)))
(cond
((pair? obj)
(apply append (map (lambda (o) (loop o)) obj)))
((markup? obj)
(let ((rest (loop (markup-body obj))))
(if (pred obj)
(cons obj rest)
rest)))
((pred obj)
(list obj))
(else
'())))))
;*---------------------------------------------------------------------*/
;* find-down ... */
;*---------------------------------------------------------------------*/
(define (find-down pred obj)
(with-debug 4 'find-down
(debug-item "obj=" (find-runtime-type obj))
(let loop ((obj obj))
(cond
((pair? obj)
(apply append (map (lambda (o) (loop o)) obj)))
((markup? obj)
(debug-item "loop=" (find-runtime-type obj)
" " (markup-ident obj))
(if (pred obj)
(list (cons obj (loop (markup-body obj))))
'()))
(else
(if (pred obj)
(list obj)
'()))))))
;*---------------------------------------------------------------------*/
;* find1-down ... */
;*---------------------------------------------------------------------*/
(define (find1-down pred obj)
(with-debug 4 'find1-down
(let loop ((obj obj)
(stack '()))
(debug-item "obj=" (find-runtime-type obj)
" " (if (markup? obj) (markup-markup obj) "???")
" " (if (markup? obj) (markup-ident obj) ""))
(cond
((memq obj stack)
(skribe-error 'find1-down "Illegal cyclic object" obj))
((pair? obj)
(let liip ((obj obj))
(cond
((null? obj)
#f)
(else
(or (loop (car obj) (cons obj stack))
(liip (cdr obj)))))))
((pred obj)
obj)
((markup? obj)
(loop (markup-body obj) (cons obj stack)))
(else
#f)))))
;*---------------------------------------------------------------------*/
;* find-up ... */
;*---------------------------------------------------------------------*/
(define (find-up pred obj)
(let loop ((obj obj)
(res '()))
(cond
((not (ast? obj))
res)
((pred obj)
(loop (ast-parent obj) (cons obj res)))
(else
(loop (ast-parent obj) (cons obj res))))))
;*---------------------------------------------------------------------*/
;* find1-up ... */
;*---------------------------------------------------------------------*/
(define (find1-up pred obj)
(let loop ((obj obj))
(cond
((not (ast? obj))
#f)
((pred obj)
obj)
(else
(loop (ast-parent obj))))))
;*---------------------------------------------------------------------*/
;* ast-document ... */
;*---------------------------------------------------------------------*/
(define (ast-document m)
(find1-up document? m))
;*---------------------------------------------------------------------*/
;* ast-chapter ... */
;*---------------------------------------------------------------------*/
(define (ast-chapter m)
(find1-up (lambda (n) (is-markup? n 'chapter)) m))
;*---------------------------------------------------------------------*/
;* ast-section ... */
;*---------------------------------------------------------------------*/
(define (ast-section m)
(find1-up (lambda (n) (is-markup? n 'section)) m))
;*---------------------------------------------------------------------*/
;* the-body ... */
;* ------------------------------------------------------------- */
;* Filter out the options */
;*---------------------------------------------------------------------*/
(define (the-body opt+)
(let loop ((opt* opt+)
(res '()))
(cond
((null? opt*)
(reverse! res))
((not (pair? opt*))
(skribe-error 'the-body "Illegal body" opt*))
((keyword? (car opt*))
(if (null? (cdr opt*))
(skribe-error 'the-body "Illegal option" (car opt*))
(loop (cddr opt*) res)))
(else
(loop (cdr opt*) (cons (car opt*) res))))))
;*---------------------------------------------------------------------*/
;* the-options ... */
;* ------------------------------------------------------------- */
;* Returns an list made of options. The OUT argument contains */
;* keywords that are filtered out. */
;*---------------------------------------------------------------------*/
(define (the-options opt+ . out)
(let loop ((opt* opt+)
(res '()))
(cond
((null? opt*)
(reverse! res))
((not (pair? opt*))
(skribe-error 'the-options "Illegal options" opt*))
((keyword? (car opt*))
(cond
((null? (cdr opt*))
(skribe-error 'the-options "Illegal option" (car opt*)))
((memq (car opt*) out)
(loop (cdr opt*) res))
(else
(loop (cdr opt*)
(cons (list (car opt*) (cadr opt*)) res)))))
(else
(loop (cdr opt*) res)))))
;*---------------------------------------------------------------------*/
;* list-split ... */
;*---------------------------------------------------------------------*/
(define (list-split l num . fill)
(let loop ((l l)
(i 0)
(acc '())
(res '()))
(cond
((null? l)
(reverse! (cons (if (or (null? fill) (= i num))
(reverse! acc)
(append! (reverse! acc)
(make-list (- num i) (car fill))))
res)))
((= i num)
(loop l
0
'()
(cons (reverse! acc) res)))
(else
(loop (cdr l)
(+ i 1)
(cons (car l) acc)
res)))))
;;; utils.scm ends here
|
