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;; $Id: dbtable.dsl,v 1.1 2002/07/20 11:07:56 goba Exp $
;;
;; This file is part of the Modular DocBook Stylesheet distribution.
;; See ../README or http://nwalsh.com/docbook/dsssl/
;;
;; This file contains table functions common to both print and HTML
;; versions of the DocBook stylesheets.
;;
;; If **ANY** change is made to this file, you _MUST_ alter the
;; following definition:
(define %docbook-common-table-version%
"Modular DocBook Stylesheet Common Table Functions")
;; == Table Support =====================================================
;; ----------------------------------------------------------------------
;; Functions for finding/retrieving table attributes
(define (tgroup-align tgroup)
(attribute-string (normalize "align") tgroup))
(define (tgroup-colsep tgroup)
(attribute-string (normalize "colsep") tgroup))
(define (tgroup-rowsep tgroup)
(attribute-string (normalize "rowsep") tgroup))
;; - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
(define (find-tgroup #!optional (nd (current-node)))
;; for our purposes, an entrytbl functions as a tgroup.
;; ENTRYTBL IS ONLY SUPPORTED IN THE HTML BACKEND!!!
(if (or (equal? (gi nd) (normalize "tgroup"))
(equal? (gi nd) (normalize "entrytbl")))
nd
(if (node-list-empty? (ancestor (normalize "entrytbl") nd))
(ancestor (normalize "tgroup") nd)
(ancestor (normalize "entrytbl") nd))))
(define (find-colspec colname)
(let* ((tgroup (find-tgroup))
(colspecs (select-elements (descendants tgroup)
(normalize "colspec"))))
(let loop ((nl colspecs))
(if (node-list-empty? nl)
;; we've run out of places to look, stop looking...
(error (string-append "Could not find COLSPEC named " colname))
(if (equal? colname
(attribute-string (normalize "colname")
(node-list-first nl)))
(node-list-first nl)
(loop (node-list-rest nl)))))))
(define (find-colspec-by-number colnum)
(let* ((tgroup (find-tgroup))
(colspecs (select-elements (children tgroup) (normalize "colspec"))))
(let loop ((nl colspecs))
(if (node-list-empty? nl)
;; we've run out of places to look, stop looking...
(empty-node-list)
(if (equal? (colspec-colnum (node-list-first nl)) colnum)
(node-list-first nl)
(loop (node-list-rest nl)))))))
(define (colspec-align colspec)
(attribute-string (normalize "align") colspec))
(define (colspec-char colspec)
(attribute-string (normalize "char") colspec))
(define (colspec-charoff colspec)
(let ((charoff (attribute-string (normalize "charoff") colspec)))
(if charoff
(string->number charoff)
#f)))
(define (colspec-colnum colspec)
;; returns the column number of the associated colspec...which is
;; either the value of COLNUM or obtained by counting
(let* ((tgroup (find-tgroup colspec))
(colspecs (select-elements (children tgroup) (normalize "colspec"))))
(if (attribute-string (normalize "colnum") colspec)
(string->number (attribute-string (normalize "colnum") colspec))
(let loop ((nl colspecs) (curcol 1))
(let ((colnum (attribute-string (normalize "colnum") (node-list-first nl))))
(if (node-list=? (node-list-first nl) colspec)
curcol
(if colnum
(loop (node-list-rest nl) (+ (string->number colnum) 1))
(loop (node-list-rest nl) (+ curcol 1)))))))))
(define (colspec-colname colspec)
(attribute-string (normalize "colname") colspec))
(define (colspec-colsep colspec)
(attribute-string (normalize "colsep") colspec))
(define (colspec-colwidth colspec)
(if (attribute-string (normalize "colwidth") colspec)
(attribute-string (normalize "colwidth") colspec)
"1*"))
(define (colspec-rowsep colspec)
(attribute-string (normalize "rowsep") colspec))
;; - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
(define (find-spanspec spanname)
(let* ((tgroup (find-tgroup))
(spanspecs (select-elements (descendants tgroup)
(normalize (normalize "spanspec")))))
(let loop ((nl spanspecs))
(if (node-list-empty? nl)
(error (string-append "Could not find SPANSPEC named " spanname))
(if (equal? spanname
(attribute-string (normalize "spanname")
(node-list-first nl)))
(node-list-first nl)
(loop (node-list-rest nl)))))))
(define (spanspec-align spanspec)
(attribute-string (normalize "align") spanspec))
(define (spanspec-char spanspec)
(attribute-string (normalize "char") spanspec))
(define (spanspec-charoff spanspec)
(let ((charoff (attribute-string (normalize "charoff") spanspec)))
(if charoff
(string->number charoff)
#f)))
(define (spanspec-colsep spanspec)
(attribute-string (normalize "colsep") spanspec))
(define (spanspec-nameend spanspec)
(attribute-string (normalize "nameend") spanspec))
(define (spanspec-namest spanspec)
(attribute-string (normalize "namest") spanspec))
(define (spanspec-rowsep spanspec)
(attribute-string (normalize "rowsep") spanspec))
(define (spanspec-spanname spanspec)
(attribute-string (normalize "spanname") spanspec))
;; - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
;; Calculate spans
(define (hspan entry)
;; Returns the horizontal span of an entry
(let* ((spanname (attribute-string (normalize "spanname") entry))
(namest (if spanname
(spanspec-namest (find-spanspec spanname))
(attribute-string (normalize "namest") entry)))
(nameend (if spanname
(spanspec-nameend (find-spanspec spanname))
(attribute-string (normalize "nameend") entry)))
(colst (if namest
(colspec-colnum (find-colspec namest))
#f))
(colend (if nameend
(colspec-colnum (find-colspec nameend))
#f)))
(if (and namest nameend)
(+ (- colend colst) 1)
1)))
(define (vspan entry)
;; Returns the vertical span of an entry. Note that this is one more
;; than the specified MOREROWS attribute.
(let* ((morerows (attribute-string (normalize "morerows") entry)))
(if morerows
(+ (string->number morerows) 1)
1)))
;; - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
;; Update the "overhang" list
(define (adjust-overhang overhang oldoverhang entry)
(let* ((colst (cell-column-number entry oldoverhang))
(span (hspan entry)))
(if (> (vspan entry) 1)
(list-put overhang colst (- (vspan entry) 1) span)
overhang)))
(define (overhang-skip overhang startcol)
(if (> startcol (length overhang))
;; this is a _broken_ table. should I output a debug message!?
startcol
(let loop ((overtail (list-tail overhang (- startcol 1))) (col startcol))
(if (null? overtail)
col
(if (equal? (car overtail) 0)
col
(loop (cdr overtail) (+ col 1)))))))
(define (update-overhang row oldoverhang)
(let loop ((overhang (decrement-list-members oldoverhang))
(entries (node-list-filter-out-pis (children row))))
(if (node-list-empty? entries)
overhang
(loop (adjust-overhang overhang oldoverhang
(node-list-first entries))
(node-list-rest entries)))))
;; - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
;; Calculate information about cells
(define (cell-prev-cell entry)
;; Return the cell which precedes entry in the current row.
(let loop ((nd (ipreced entry)))
(if (node-list-empty? nd)
nd
(if (equal? (node-property 'class-name nd) 'element)
nd
(loop (ipreced nd))))))
(define (cell-column-number entry overhang)
(let* ((entry (ancestor-member entry (list (normalize "entry") (normalize "entrytbl"))))
(row (ancestor (normalize "row") entry))
(preventry (cell-prev-cell entry))
(prevspan (if (node-list-empty? preventry) 1 (hspan preventry)))
(colname (attribute-string (normalize "colname") entry))
(namest (attribute-string (normalize "namest") entry))
(nameend (attribute-string (normalize "nameend") entry))
(spanname (attribute-string (normalize "spanname") entry)))
(if colname
(colspec-colnum (find-colspec colname))
(if spanname
(colspec-colnum (find-colspec
(spanspec-namest (find-spanspec spanname))))
(if namest
(colspec-colnum (find-colspec namest))
(if (node-list-empty? preventry)
(overhang-skip overhang 1)
(overhang-skip overhang
(+ (cell-column-number preventry overhang)
prevspan))))))))
;; ======================================================================
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