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|
;;; text-table.scm -- Producing ASCII tables.
;;;
;;; Copyright 2008 Ludovic Courtès <ludo@gnu.org>
;;; Copyright 2001 Manuel Serrano
;;;
;;;
;;; This file is part of Skribilo.
;;;
;;; Skribilo 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.
;;;
;;; Skribilo 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 Skribilo. If not, see <http://www.gnu.org/licenses/>.
(define-module (skribilo utils text-table)
:use-module (skribilo ast)
:use-module (skribilo table)
:use-module (skribilo utils justify)
:use-module (skribilo utils syntax)
:export (table->ascii))
;;; Author: Manuel Serrano, Ludovic Courtès
;;;
;;; Commentary:
;;;
;;; Provide a procedure, `table->ascii', that produces a representation of
;;; the given table using ASCII symbols.
;;;
;;; Code:
(skribilo-module-syntax)
;*---------------------------------------------------------------------*/
;* table->ascii ... */
;*---------------------------------------------------------------------*/
(define (table->ascii obj scribe->ascii)
(let ((width (markup-option obj :width))
(nbcols (table-column-count obj))
(rows (markup-body obj)))
(let* ((nc nbcols)
(awidth (- (cond
((integer? width)
width)
((and (number? width) (inexact? width))
(inexact->exact (* width (justification-width))))
(else
(justification-width)))
;; remove one characters per columns separation
(- nc 1)))
(colswidth (rows-requested-sizes obj nc awidth))
(lcolswidth (map round-to-exact (vector->list colswidth)))
(nb-def-cols (length (filter (lambda (s) (= s 0)) lcolswidth)))
(defcolwidth (if (= nb-def-cols 0)
0
(inexact->exact
(/ (- awidth (apply + lcolswidth))
nb-def-cols)))))
;; we have computed the requested col sizes and the global size
;; of the table, we now compute the exact col sizes
(let loop ((i 0)
(sum 0))
(if (= i nc)
;; we adjust (because of modulo approx) the last column
(if (not (= sum awidth))
(vector-set! colswidth
(- i 1)
(+ (vector-ref colswidth (- i 1))
(- awidth sum))))
(if (= (vector-ref colswidth i) 0)
(begin
(vector-set! colswidth i defcolwidth)
(loop (+ i 1) (+ sum defcolwidth)))
(loop (+ i 1) (+ sum (vector-ref colswidth i))))))
;; at that point colswidth contains the width of each colums.
(let ((lcolswidth (map round-to-exact (vector->list colswidth)))
(hrows (map (lambda (r)
(table-row-format r nc colswidth scribe->ascii))
rows)))
(let ((vrows (map (lambda (r)
(let ((lines (apply max
(map (lambda (c)
(length (cdr c)))
r))))
(smallest-map (lambda (c cw)
(table-cell-vformat
c lines cw))
r lcolswidth)))
hrows)))
;; we are done, all cells are formated, we can display the
;; whole table now
(for-each (lambda (r)
(apply for-each
(lambda l
(for-each output-token l)
(output-newline))
r))
vrows))))))
;*---------------------------------------------------------------------*/
;* table-row-format ... */
;*---------------------------------------------------------------------*/
(define (table-row-format row nbcols colswidth scribe->ascii)
(define (cell-width cnum cspan)
(let ((v (do ((i cnum (+ i 1))
(w 0 (+ w (round-to-exact (vector-ref colswidth i)))))
((= i (+ cnum cspan)) w))))
(+ v (- cspan 1))))
(let ((cells (markup-body row)))
(let loop ((cells cells)
(cnum 0)
(res '()))
(cond
((pair? cells)
(let* ((cell (car cells))
(cspan (markup-option cell :colspan))
(cell-width (cell-width cnum cspan)))
(loop (cdr cells)
(+ cnum cspan)
(cons (table-cell-format cell
cell-width
scribe->ascii)
res))))
((= cnum nbcols)
(reverse! res))
(else
(let ((eline (make-string (vector-ref colswidth cnum) #\space)))
(loop cells
(+ cnum 1)
(cons (cons #f ;; XXX: It's unclear why we need it
(list eline)) res))))))))
;*---------------------------------------------------------------------*/
;* table-cell-format table-cell ... */
;* ------------------------------------------------------------- */
;* Output a table cell according to its WIDTH. At that time we have */
;* to ignore the width that is specified in the cell because we */
;* have processed a global computation of column width. For the */
;* reason, we ignore the cell COLSPAN. */
;* ------------------------------------------------------------- */
;* This is a bit tricky because we can't display the cell as */
;* we process it. We have to store in data structures the lines */
;* representing the cell and in a second time, when all the table */
;* is processed we display the cells. For that reason, we can't */
;* use WITH-JUSTIFICATION form. */
;*---------------------------------------------------------------------*/
(define (table-cell-format obj width scribe->ascii)
(let ((align (markup-option obj :align))
(body (markup-body obj)))
(cons obj
(let ((fmt (with-justification/noflush
(make-justifier width
(case align
((left)
'left)
((right)
'right)
((center)
'center)
(else
(if (not align)
'left
(error "table-cell-format"
"Invalid horizontal alignment"
align)))))
(lambda () (scribe->ascii body)))))
(if (null? fmt)
'("")
fmt)))))
;*---------------------------------------------------------------------*/
;* table-cell-vformat ... */
;* ------------------------------------------------------------- */
;* We have formated the table cell horizontally. Now we have to */
;* consider the VALIGN fields. That is, we complete the cell */
;* formating with empty blank line around the cell. */
;*---------------------------------------------------------------------*/
(define (table-cell-vformat p nblines cwidth)
(define (make-filler-lines num)
(vector->list (make-vector num (make-string cwidth #\Space))))
(let* ((cell (car p))
(fmt (cdr p))
(lfmt (length fmt)))
(if (= lfmt nblines)
fmt
(let* ((new (- nblines lfmt))
(new/2 (inexact->exact (round (/ new 2)))))
(case (markup-option cell :valign)
((top)
(append fmt (make-filler-lines new)))
((bottom)
(append (make-filler-lines new) fmt))
(else
(append (make-filler-lines new/2)
fmt
(make-filler-lines (- nblines lfmt new/2)))))))))
;*---------------------------------------------------------------------*/
;* rows-requested-sizes ... */
;* ------------------------------------------------------------- */
;* This function scans all the rows of TABLE. It check each */
;* cells of the rows in order to find out if there is a */
;* specified width for the column the cell belongs to. */
;*---------------------------------------------------------------------*/
(define (rows-requested-sizes table nbcols twidth)
(let ((rsizes (make-vector nbcols 0)))
(for-each (lambda (row)
(let loop ((cells (markup-body row))
(col 0))
(if (pair? cells)
(let* ((cell (car cells))
(cspan (markup-option cell :colspan))
(swidth (markup-option cell :width)))
(if (number? swidth)
(let* ((swidth (if (integer? swidth)
swidth
(inexact->exact
(* swidth twidth))))
(cswidth (/ swidth cspan)))
(do ((j 0 (+ j 1)))
((= j cspan)
(loop (cdr cells)
(+ col cspan)))
(if (< (vector-ref rsizes (+ col j))
cswidth)
(vector-set! rsizes
(+ col j)
cswidth))))
(loop (cdr cells) (+ col cspan)))))))
(markup-body table))
rsizes))
;;;
;;; Convenience functions.
;;;
(define (smallest-map f l1 l2)
(if (or (null? l1) (null? l2))
'()
(cons (f (car l1) (car l2)) (smallest-map f (cdr l1) (cdr l2)))))
(define (round-to-exact w)
(if (inexact? w)
(inexact->exact (round w))
(round w)))
;;; text-table.scm ends here
|
