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420 lines
15 KiB
Plaintext
Executable File
420 lines
15 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://www.berkshire.net/~norm/dsssl/
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;;
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;; Table support completely reimplemented by norm 15/16 Nov 1997.
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;; Adapted from print support.
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;;
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;; ======================================================================
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;;
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;; This code is intended to implement the SGML Open Exchange Table Model
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;; (http://www.sgmlopen.org/sgml/docs/techpubs.htm) as far as is possible
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;; in HTML. There are a few areas where this code probably fails to
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;; perfectly implement the model:
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;;
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;; - Mixed column width units (4*+2pi) are not supported.
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;; - The behavior that results from mixing relative units with
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;; absolute units has not been carefully considered.
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;;
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;; ======================================================================
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;;
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;; My goal in reimplementing the table model was to provide correct
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;; formatting in tables that use MOREROWS. The difficulty is that
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;; correct formatting depends on calculating the column into which
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;; an ENTRY will fall.
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;;
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;; This is a non-trivial problem because MOREROWS can hang down from
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;; preceding rows and ENTRYs may specify starting columns (skipping
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;; preceding ones).
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;;
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;; A simple, elegant recursive algorithm exists. Unfortunately it
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;; requires calculating the column number of every preceding cell
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;; in the entire table. Without memoization, performance is unacceptable
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;; even in relatively small tables (5x5, for example).
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;;
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;; In order to avoid recursion, the algorithm used below is one that
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;; works forward from the beginning of the table and "passes along"
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;; the relevant information (column number of the preceding cell and
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;; overhang from the MOREROWS in preceding rows).
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;;
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;; Unfortunately, this means that element construction rules
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;; can't always be used to fire the appropriate rule. Instead,
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;; each TGROUP has to process each THEAD/BODY/FOOT explicitly.
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;; And each of those must process each ROW explicitly, then each
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;; ENTRY/ENTRYTBL explicitly.
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;;
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;; ----------------------------------------------------------------------
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;;
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;; I attempted to simplify this code by relying on inheritence from
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;; table-column flow objects, but that wasn't entirely successful.
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;; Horizontally spanning cells didn't seem to inherit from table-column
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;; flow objects that didn't specify equal spanning. There seemed to
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;; be other problems as well, but they could have been caused by coding
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;; errors on my part.
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;;
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;; Anyway, by the time I understood how I could use table-column
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;; flow objects for inheritence, I'd already implemented all the
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;; machinery below to "work it out by hand".
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;;
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;; ======================================================================
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;; NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE
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;; ----------------------------------------------------------------------
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;; A fairly large chunk of this code is in dbcommon.dsl!
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;; ======================================================================
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;; Default for COLSEP/ROWSEP if unspecified
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(define %cals-rule-default% "0")
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;; Default for VALIGN if unspecified
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(define %cals-valign-default% "TOP")
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;; ======================================================================
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;; Convert colwidth units into table-unit measurements
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(define (colwidth-length lenstr)
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(if (string? lenstr)
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(let ((number (length-string-number-part lenstr))
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(units (length-string-unit-part lenstr)))
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(if (or (string=? units "*") (string=? number ""))
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;; relative units or no number, give up
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0pt
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(if (string=? units "")
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;; no units, default to pixels
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(* (string->number number) 1px)
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(let* ((unum (string->number number))
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(uname (case-fold-down units)))
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(case uname
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(("mm") (* unum 1mm))
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(("cm") (* unum 1cm))
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(("in") (* unum 1in))
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(("pi") (* unum 1pi))
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(("pt") (* unum 1pt))
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(("px") (* unum 1px))
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;; unrecognized units; use pixels
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(else (* unum 1px)))))))
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;; lenstr is not a string...probably #f
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0pt))
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(define (cals-relative-colwidth? colwidth)
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(if (string? colwidth)
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(let ((strlen (string-length colwidth)))
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(if (string=? colwidth "*")
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#t
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(string=? (substring colwidth (- strlen 1) strlen) "*")))
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#f))
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(define (cals-relative-colwidth colwidth)
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(let ((number (length-string-number-part colwidth))
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(units (length-string-unit-part colwidth)))
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(if (string=? units "*")
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(if (string=? number "")
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1
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(string->number number))
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0)))
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(define (cell-relative-colwidth cell relative)
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(let* ((tgroup (find-tgroup cell)))
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(let loop ((colspecs (select-elements (children tgroup)
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(normalize "colspec")))
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(reltotal 0))
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(if (node-list-empty? colspecs)
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(string-append (number->string (round (* (/ relative reltotal) 100))) "%")
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(loop (node-list-rest colspecs)
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(+ reltotal (cals-relative-colwidth
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(colspec-colwidth
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(node-list-first colspecs)))))))))
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(define (cell-colwidth cell colnum)
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(let* ((entry (ancestor-member cell (list (normalize "entry")
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(normalize "entrytbl"))))
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(colspec (find-colspec-by-number colnum))
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(colwidth (colspec-colwidth colspec))
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(width (round (/ (colwidth-length colwidth) 1px))))
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(if (node-list-empty? colspec)
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""
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(if (and (equal? (hspan entry) 1) colwidth)
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(if (cals-relative-colwidth? colwidth)
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(cell-relative-colwidth cell (cals-relative-colwidth colwidth))
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(number->string width))
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""))))
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;; ======================================================================
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(define (cell-align cell colnum)
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(let* ((entry (ancestor-member cell (list (normalize "entry")
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(normalize "entrytbl"))))
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(tgroup (find-tgroup entry))
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(spanname (attribute-string (normalize "spanname") entry))
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(calsalign (if (attribute-string (normalize "align") entry)
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(attribute-string (normalize "align") entry)
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(if (and spanname
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(spanspec-align (find-spanspec spanname)))
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(spanspec-align (find-spanspec spanname))
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(if (colspec-align (find-colspec-by-number colnum))
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(colspec-align (find-colspec-by-number colnum))
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(if (tgroup-align tgroup)
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(tgroup-align tgroup)
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(normalize "left")))))))
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(cond
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((equal? calsalign (normalize "left")) "LEFT")
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((equal? calsalign (normalize "center")) "CENTER")
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((equal? calsalign (normalize "right")) "RIGHT")
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(else "LEFT"))))
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(define (cell-valign cell colnum)
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(let* ((entry (ancestor-member cell (list (normalize "entry")
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(normalize "entrytbl"))))
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(row (ancestor (normalize "row") entry))
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(tbody (ancestor-member cell (list (normalize "tbody")
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(normalize "thead") (normalize "tfoot"))))
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(tgroup (find-tgroup entry))
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(calsvalign (if (attribute-string (normalize "valign") entry)
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(attribute-string (normalize "valign") entry)
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(if (attribute-string (normalize "valign") row)
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(attribute-string (normalize "valign") row)
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(if (attribute-string (normalize "valign") tbody)
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(attribute-string (normalize "valign") tbody)
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%cals-valign-default%)))))
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(cond
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((equal? calsvalign (normalize "top")) "TOP")
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((equal? calsvalign (normalize "middle")) "MIDDLE")
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((equal? calsvalign (normalize "bottom")) "BOTTOM")
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(else "MIDDLE"))))
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;; ======================================================================
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;; Element rules
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(element tgroup
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(let* ((wrapper (parent (current-node)))
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(frameattr (attribute-string (normalize "frame") wrapper))
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(pgwide (attribute-string (normalize "pgwide") wrapper))
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(footnotes (select-elements (descendants (current-node))
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(normalize "footnote")))
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(border (if (equal? frameattr (normalize "none"))
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'(("BORDER" "0"))
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'(("BORDER" "1"))))
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(width (if (equal? pgwide "1")
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(list (list "WIDTH" ($table-width$)))
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'()))
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(head (select-elements (children (current-node)) (normalize "thead")))
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(body (select-elements (children (current-node)) (normalize "tbody")))
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(feet (select-elements (children (current-node)) (normalize "tfoot"))))
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(make element gi: "TABLE"
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attributes: (append
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border
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width
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(if %cals-table-class%
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(list (list "CLASS" %cals-table-class%))
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'()))
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(process-node-list head)
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(process-node-list body)
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(process-node-list feet)
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(make-table-endnotes))))
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(element entrytbl ;; sortof like a tgroup...
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(let* ((wrapper (parent (parent (parent (parent (current-node))))))
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;; table tgroup tbody row
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(frameattr (attribute-string (normalize "frame") wrapper))
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(tgrstyle (attribute-string (normalize "tgroupstyle")))
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(border (if (and (or (equal? frameattr (normalize "none"))
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(equal? tgrstyle (normalize "noborder")))
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(not (equal? tgrstyle (normalize "border"))))
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'(("BORDER" "0"))
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'(("BORDER" "1"))))
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(head (select-elements (children (current-node)) (normalize "thead")))
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(body (select-elements (children (current-node)) (normalize "tbody"))))
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(make element gi: "TABLE"
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attributes: (append
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border
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(if %cals-table-class%
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(list (list "CLASS" %cals-table-class%))
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'()))
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(process-node-list head)
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(process-node-list body))))
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(element colspec
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(empty-sosofo))
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(element spanspec
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(empty-sosofo))
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(element thead
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(if %html40%
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(make element gi: "THEAD"
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($process-table-body$ (current-node)))
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($process-table-body$ (current-node))))
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(element tfoot
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(if %html40%
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(make element gi: "TFOOT"
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($process-table-body$ (current-node)))
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($process-table-body$ (current-node))))
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(element tbody
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(if %html40%
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(make element gi: "TBODY"
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($process-table-body$ (current-node)))
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($process-table-body$ (current-node))))
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(element row
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(empty-sosofo)) ;; this should never happen, they're processed explicitly
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(element entry
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(empty-sosofo)) ;; this should never happen, they're processed explicitly
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;; ======================================================================
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;; Functions that handle processing of table bodies, rows, and cells
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(define ($process-table-body$ body)
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(let* ((tgroup (find-tgroup body))
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(cols (string->number (attribute-string (normalize "cols")
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tgroup))))
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(let loop ((rows (select-elements (children body) (normalize "row")))
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(overhang (constant-list 0 cols)))
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(if (node-list-empty? rows)
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(empty-sosofo)
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(make sequence
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($process-row$ (node-list-first rows) overhang)
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(loop (node-list-rest rows)
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(update-overhang (node-list-first rows) overhang)))))))
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(define ($process-row$ row overhang)
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(let* ((tgroup (find-tgroup row))
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(rowcells (node-list-filter-out-pis (children row)))
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(maxcol (string->number (attribute-string (normalize "cols") tgroup)))
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(lastentry (node-list-last rowcells))
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(table (ancestor-member tgroup (list (normalize "table")
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(normalize "informaltable"))))
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(rowsep (if (attribute-string (normalize "rowsep") row)
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(attribute-string (normalize "rowsep") row)
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(if (attribute-string (normalize "rowsep") tgroup)
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(attribute-string (normalize "rowsep") tgroup)
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(if (attribute-string (normalize "rowsep") table)
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(attribute-string (normalize "rowsep") table)
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%cals-rule-default%))))
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(after-row-border (if rowsep
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(> (string->number rowsep) 0)
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#f)))
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(make element gi: "TR"
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(let loop ((cells rowcells)
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(prevcell (empty-node-list)))
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(if (node-list-empty? cells)
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(empty-sosofo)
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(make sequence
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($process-cell$ (node-list-first cells)
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prevcell overhang)
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(loop (node-list-rest cells)
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(node-list-first cells)))))
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;; add any necessary empty cells to the end of the row
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(let loop ((colnum (overhang-skip overhang
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(+ (cell-column-number
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lastentry overhang)
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(hspan lastentry)))))
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(if (> colnum maxcol)
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(empty-sosofo)
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(make sequence
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(make element gi: "TD"
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(make entity-ref name: "nbsp"))
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(loop (overhang-skip overhang (+ colnum 1)))))))))
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(define (empty-cell? entry)
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;; Return #t if and only if entry is empty (or contains only PIs)
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(let loop ((nl (children entry)))
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(if (node-list-empty? nl)
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#t
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(let* ((node (node-list-first nl))
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(nodeclass (node-property 'class-name node))
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(nodechar (if (equal? nodeclass 'data-char)
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(node-property 'char node)
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#f))
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(whitespace? (and (equal? nodeclass 'data-char)
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(or (equal? nodechar #\space)
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(equal? (data node) "	")
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(equal? (data node) " ")
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(equal? (data node) " ")))))
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(if (not (or (equal? (node-property 'class-name node) 'pi)
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whitespace?))
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#f
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(loop (node-list-rest nl)))))))
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(define ($process-cell$ entry preventry overhang)
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(let* ((colnum (cell-column-number entry overhang))
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(lastcellcolumn (if (node-list-empty? preventry)
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0
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(- (+ (cell-column-number preventry overhang)
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(hspan preventry))
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1)))
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(lastcolnum (if (> lastcellcolumn 0)
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(overhang-skip overhang lastcellcolumn)
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0))
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(htmlgi (if (have-ancestor? (normalize "tbody") entry)
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"TD"
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"TH")))
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(make sequence
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(if (node-list-empty? (preced entry))
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(if (attribute-string (normalize "id") (parent entry))
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(make element gi: "A"
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attributes: (list
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(list
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"NAME"
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(attribute-string (normalize "id")
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(parent entry))))
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(empty-sosofo))
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(empty-sosofo))
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(empty-sosofo))
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(if (attribute-string (normalize "id") entry)
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(make element gi: "A"
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attributes: (list
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(list
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"NAME"
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(attribute-string (normalize "id") entry)))
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(empty-sosofo))
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(empty-sosofo))
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;; This is a little bit complicated. We want to output empty cells
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;; to skip over missing data. We start count at the column number
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;; arrived at by adding 1 to the column number of the previous entry
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;; and skipping over any MOREROWS overhanging entrys. Then for each
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;; iteration, we add 1 and skip over any overhanging entrys.
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(let loop ((count (overhang-skip overhang (+ lastcolnum 1))))
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(if (>= count colnum)
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(empty-sosofo)
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(make sequence
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(make element gi: htmlgi
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(make entity-ref name: "nbsp")
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;; (literal (number->string lastcellcolumn) ", ")
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;; (literal (number->string lastcolnum) ", ")
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;; (literal (number->string (hspan preventry)) ", ")
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;; (literal (number->string colnum ", "))
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;; ($debug-pr-overhang$ overhang)
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)
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(loop (overhang-skip overhang (+ count 1))))))
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; (if (equal? (gi entry) (normalize "entrytbl"))
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; (make element gi: htmlgi
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; (literal "ENTRYTBL not supported."))
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(make element gi: htmlgi
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attributes: (append
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(if (> (hspan entry) 1)
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(list (list "COLSPAN" (number->string (hspan entry))))
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'())
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(if (> (vspan entry) 1)
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(list (list "ROWSPAN" (number->string (vspan entry))))
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'())
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(if (equal? (cell-colwidth entry colnum) "")
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'()
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(list (list "WIDTH" (cell-colwidth entry colnum))))
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(list (list "ALIGN" (cell-align entry colnum)))
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(list (list "VALIGN" (cell-valign entry colnum))))
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(if (empty-cell? entry)
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(make entity-ref name: "nbsp")
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(if (equal? (gi entry) (normalize "entrytbl"))
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(process-node-list entry)
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(process-node-list (children entry))))))))
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;; EOF dbtable.dsl
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