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			245 lines
		
	
	
		
			8.2 KiB
		
	
	
	
		
			Plaintext
		
	
	
		
			Executable File
		
	
	
	
	
			
		
		
	
	
			245 lines
		
	
	
		
			8.2 KiB
		
	
	
	
		
			Plaintext
		
	
	
		
			Executable File
		
	
	
	
	
| ;; $Id$
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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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| 
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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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| 
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| (define %docbook-common-table-version%
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|   "Modular DocBook Stylesheet Common Table Functions")
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| 
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| ;; == Table Support =====================================================
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| 
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| ;; ----------------------------------------------------------------------
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| ;; Functions for finding/retrieving table attributes
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| 
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| (define (tgroup-align tgroup)
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|   (attribute-string (normalize "align") tgroup))
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| 
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| (define (tgroup-colsep tgroup)
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|   (attribute-string (normalize "colsep") tgroup))
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| 
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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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| ;; - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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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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| 
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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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| 
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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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| 
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| (define (colspec-align colspec)
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|   (attribute-string (normalize "align") colspec))
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| 
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| (define (colspec-char colspec)
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|   (attribute-string (normalize "char") colspec))
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| 
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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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| 
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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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| 
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| (define (colspec-colname colspec)
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|   (attribute-string (normalize "colname") colspec))
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| 
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| (define (colspec-colsep colspec)
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|   (attribute-string (normalize "colsep") colspec))
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| 
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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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| 
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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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| ;; - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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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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| 
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| (define (spanspec-align spanspec)
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|   (attribute-string (normalize "align") spanspec))
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| 
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| (define (spanspec-char spanspec)
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|   (attribute-string (normalize "char") spanspec))
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| 
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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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| 
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| (define (spanspec-colsep spanspec)
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|   (attribute-string (normalize "colsep") spanspec))
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| 
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| (define (spanspec-nameend spanspec)
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|   (attribute-string (normalize "nameend") spanspec))
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| 
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| (define (spanspec-namest spanspec)
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|   (attribute-string (normalize "namest") spanspec))
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| 
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| (define (spanspec-rowsep spanspec)
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|   (attribute-string (normalize "rowsep") spanspec))
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| 
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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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| ;; - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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| ;; Calculate spans
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| 
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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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| 
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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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| ;; - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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| ;; Update the "overhang" list
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| 
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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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| 
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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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| 
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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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| ;; - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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| ;; Calculate information about cells
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| 
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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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| 
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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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| ;; ======================================================================
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