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