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;;; index.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 index))
;;; Author: Manuel Serrano
;;; Commentary:
;;;
;;; A library of index-related functions.
;;;
;;; Code:
;;; The contents of the file below are unchanged compared to Skribe 1.2d's
;;; `index.scm' file found in the `common' directory.
;*---------------------------------------------------------------------*/
;* index? ... */
;*---------------------------------------------------------------------*/
(define-public (index? obj)
(hashtable? obj))
;*---------------------------------------------------------------------*/
;* *index-table* ... */
;*---------------------------------------------------------------------*/
(define-public *index-table* #f)
;*---------------------------------------------------------------------*/
;* make-index-table ... */
;*---------------------------------------------------------------------*/
(define-public (make-index-table ident)
(make-hashtable))
;*---------------------------------------------------------------------*/
;* default-index ... */
;*---------------------------------------------------------------------*/
(define-public (default-index)
(if (not *index-table*)
(set! *index-table* (make-index-table "default-index")))
*index-table*)
;*---------------------------------------------------------------------*/
;* resolve-the-index ... */
;*---------------------------------------------------------------------*/
(define-public (resolve-the-index loc i c indexes split char-offset header-limit col)
;; fetch the descriminating index name letter
(define (index-ref n)
(let ((name (markup-option n 'name)))
(if (>= char-offset (string-length name))
(skribe-error 'the-index "char-offset out of bound" char-offset)
(string-ref name char-offset))))
;; sort a bucket of entries (the entries in a bucket share there name)
(define (sort-entries-bucket ie)
(sort ie
(lambda (i1 i2)
(or (not (markup-option i1 :note))
(markup-option i2 :note)))))
;; accumulate all the entries starting with the same letter
(define (letter-references refs)
(let ((letter (index-ref (car (car refs)))))
(let loop ((refs refs)
(acc '()))
(if (or (null? refs)
(not (char-ci=? letter (index-ref (car (car refs))))))
(values (char-upcase letter) acc refs)
(loop (cdr refs) (cons (car refs) acc))))))
;; merge the buckets that comes from different index tables
(define (merge-buckets buckets)
(if (null? buckets)
'()
(let loop ((buckets buckets)
(res '()))
(cond
((null? (cdr buckets))
(reverse! (cons (car buckets) res)))
((string=? (markup-option (car (car buckets)) 'name)
(markup-option (car (cadr buckets)) 'name))
;; we merge
(loop (cons (append (car buckets) (cadr buckets))
(cddr buckets))
res))
(else
(loop (cdr buckets)
(cons (car buckets) res)))))))
(let* ((entries (apply append (map hashtable->list indexes)))
(sorted (map sort-entries-bucket
(merge-buckets
(sort entries
(lambda (e1 e2)
(string-ci<?
(markup-option (car e1) 'name)
(markup-option (car e2) 'name))))))))
(if (and (not split) (< (apply + (map length sorted)) header-limit))
(new markup
(markup '&the-index)
(loc loc)
(ident i)
(class c)
(options `((:column ,col)))
(body sorted))
(let loop ((refs sorted)
(lrefs '())
(body '()))
(if (null? refs)
(new markup
(markup '&the-index)
(loc loc)
(ident i)
(class c)
(options `((:column ,col)
(header ,(new markup
(markup '&the-index-header)
(loc loc)
(body (reverse! lrefs))))))
(body (reverse! body)))
(call-with-values
(lambda () (letter-references refs))
(lambda (l lr next-refs)
(let* ((s (string l))
(m (mark (symbol->string (gensym s)) :text s))
(h (new handle (loc loc) (ast m)))
(r (ref :handle h :text s)))
(ast-loc-set! m loc)
(ast-loc-set! r loc)
(loop next-refs
(cons r lrefs)
(append lr (cons m body)))))))))))
;;; index.scm ends here
|
