Newbie help: "empty" elements

["Len Budney" <lbudney-lists-dsssl@xxxxxx>]

Hello!

I'm trying to radically cut the fat from some HTML files--basically, I
want to strip everything but the data tables (which I plan to post-process
and stuff into a database). To do that I'm using a filter which deletes
many elements entirely.

The problem is that I want to delete "empty" elements, where "empty" means
that the only content is more elements. So a TR containing lots of empty
TDs should be discarded. So far I'm having little success.

One problem appears to be the usual whitespace problem: I'm not correctly
identifying elements whose data is just whitespace. How can I do that?

The second problem is more mysterious: even after running "sgmlnorm -dn"
to kill spurious whitespace, lots of "empty" elements aren't getting
thrown away.

Attached is the filter I'm using and the HTML file I'm testing it on. Can
anyone offer any advice? (Correction: they were attached. The mail
reflector bounced it back.)

Thanks in advance,
Len.



-Begin-----------------------------------------------------------------

<!doctype style-sheet PUBLIC "-//James Clark//DTD DSSSL Style Sheet//EN">
;; Filter to extract data from an MSN-Money page giving 10-year performance
;; information on a company. It's based on the identity transformation,
;; except that lots of things are discarded.

(declare-flow-object-class element
  "UNREGISTERED::James Clark//Flow Object Class::element")
(declare-flow-object-class empty-element
  "UNREGISTERED::James Clark//Flow Object Class::empty-element")
(declare-characteristic preserve-sdata?
  "UNREGISTERED::James Clark//Characteristic::preserve-sdata?"
  #t)

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Default rule
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(default (output-element-if-nonempty))

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Special handlers
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Sometimes a TD is empty on purpose; I want to kill it only
;; if there are no siblings with data in them.
(element TD (output-element-if-nonempty-siblings))
(element TH (output-element-if-nonempty-siblings))

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Handlers which simply suppress certain elements
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(element SCRIPT (empty-sosofo))
(element META (empty-sosofo))
(element LINK (empty-sosofo))
(element STYLE (empty-sosofo))
(element IMG (empty-sosofo))
(element FORM (empty-sosofo))
(element A (empty-sosofo))
(element HR (empty-sosofo))
(element BR (empty-sosofo))

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Handlers which drop certain elements but preserve children
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(element FONT (process-children-trim))
(element B (process-children-trim))
(element I (process-children-trim))

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Functions which handle copying of elements.
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(define (any-data? #!optional (node (current-node)))
  (if (not (equal? (data node) ""))
      #t
      (if   (node-list-empty?
	     (children node))
	    #f
	    (node-list-some? any-data? (children node)))))

(define (output-element #!optional (node (current-node)))
  (if (node-property "must-omit-end-tag?" node)
      (make empty-element
	    attributes: (copy-attributes))
      (make element
	    attributes: (copy-attributes)
	    (process-children-trim))))

(define (output-element-if-nonempty #!optional (node (current-node)))
  (if (any-data? node)
      (output-element)
      (empty-sosofo)))

(define (output-element-if-nonempty-siblings #!optional (node (current-node)))
  (if (not (zero? (node-list-length
		   (node-list-filter
		    any-data? (rsiblings node)))))
	  (output-element)
      (empty-sosofo)))

(define (copy-attributes #!optional (nd (current-node)))
  (let loop ((atts (named-node-list-names (attributes nd))))
    (if (null? atts)
        '()
        (let* ((name (car atts))
               (value (attribute-string name nd)))
          (if value
              (cons (list name value)
                    (loop (cdr atts)))
              (loop (cdr atts)))))))

-End-------------------------------------------------------------------

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</TD></TR><TR><TD><FORM NAME="frmStatements"><TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0><TR><TD><SPAN CLASS=Heading2>Tootsie Roll Industries, Inc.</SPAN>&nbsp;&nbsp;&nbsp;&nbsp;<SPAN CLASS=SmallPrompt>Fiscal Year ends 12/00</SPAN>
</TR></TABLE>
<P>
<TABLE BORDER=0 CELLPADDING=0 CELLSPACING=0>
<TR ALIGN=LEFT>
<TD>
	<B>Financial Statement:</B>
	<SELECT NAME="lstStatement" onChange='switchStatement(); return true' SIZE=1>

<OPTION VALUE="Income">Income Statement</OPTION><OPTION VALUE="Balance">Balance Sheet</OPTION><OPTION VALUE="CashFlow">Cash Flow</OPTION><OPTION SELECTED VALUE="10YearSummary">10 Year Summary</OPTION>

	</SELECT>
</TD>
<TD WIDTH=10>&nbsp;</TD>
<TD>

</TD>				
</TR>
<TR><TD COLSPAN=3>
<SPAN CLASS=SmallPrompt>Financial statements are presented in a <A HREF=/investor/glossary/glossary.asp?TermID=599>Media General Financial Services proprietary format</A>.
See 10K and 10Q <A HREF="http://news.moneycentral.msn.com/sec/all.asp?Symbol=tr";>SEC Filings</A> for as reported statements.
</SPAN>
</TD></TR>
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<SPAN CLASS=Heading3>Income Statement - 10 Year Summary</SPAN>
<TABLE WIDTH="100%" BORDER=1 CELLPADDING=1 CELLSPACING=0 RULES=ROWS FRAME=BELOW BORDERCOLOR=#CCCC99 BORDERCOLORDARK=WHITE>
<TR ALIGN=RIGHT VALIGN=BOTTOM CLASS=smallfontreverse><TD>&nbsp;</TD><TD CLASS=smallfontreverse><B>Sales</B></TD>
<TD CLASS=smallfontreverse><B>EBIT</B></TD>
<TD CLASS=smallfontreverse><B>Depreciation</B></TD>
<TD CLASS=smallfontreverse><B>Total Net Income</B></TD>
<TD CLASS=smallfontreverse><B>EPS</B></TD>
<TD CLASS=smallfontreverse><B>Tax Rate (%)</B></TD>
</TR>
<TR ALIGN=RIGHT>
<TD ALIGN=LEFT>12/99</TD>
<TD>396.8</TD>
<TD>104.5</TD>
<TD>10.0</TD>
<TD>71.3</TD>
<TD>1.46</TD>
<TD>36.00</TD>
</TR>
<TR ALIGN=RIGHT>
<TD ALIGN=LEFT>12/98</TD>
<TD>388.7</TD>
<TD>101.3</TD>
<TD>12.8</TD>
<TD>67.5</TD>
<TD>1.41</TD>
<TD>36.30</TD>
</TR>
<TR ALIGN=RIGHT>
<TD ALIGN=LEFT>12/97</TD>
<TD>375.6</TD>
<TD>90.1</TD>
<TD>12.8</TD>
<TD>60.7</TD>
<TD>1.25</TD>
<TD>36.40</TD>
</TR>
<TR ALIGN=RIGHT>
<TD ALIGN=LEFT>12/96</TD>
<TD>340.9</TD>
<TD>71.5</TD>
<TD>12.1</TD>
<TD>47.2</TD>
<TD>0.97</TD>
<TD>37.20</TD>
</TR>
<TR ALIGN=RIGHT>
<TD ALIGN=LEFT>12/95</TD>
<TD>312.7</TD>
<TD>61.5</TD>
<TD>10.7</TD>
<TD>40.4</TD>
<TD>0.83</TD>
<TD>37.00</TD>
</TR>
<TR ALIGN=RIGHT>
<TD ALIGN=LEFT>12/94</TD>
<TD>296.9</TD>
<TD>62.6</TD>
<TD>10.5</TD>
<TD>37.9</TD>
<TD>0.78</TD>
<TD>38.10</TD>
</TR>
<TR ALIGN=RIGHT>
<TD ALIGN=LEFT>12/93</TD>
<TD>259.6</TD>
<TD>55.0</TD>
<TD>8.8</TD>
<TD>35.4</TD>
<TD>0.73</TD>
<TD>38.60</TD>
</TR>
<TR ALIGN=RIGHT>
<TD ALIGN=LEFT>12/92</TD>
<TD>245.4</TD>
<TD>49.1</TD>
<TD>6.1</TD>
<TD>32.0</TD>
<TD>0.64</TD>
<TD>38.30</TD>
</TR>
<TR ALIGN=RIGHT>
<TD ALIGN=LEFT>12/91</TD>
<TD>207.9</TD>
<TD>42.5</TD>
<TD>5.2</TD>
<TD>26.5</TD>
<TD>0.56</TD>
<TD>39.90</TD>
</TR>
<TR ALIGN=RIGHT>
<TD ALIGN=LEFT>12/90</TD>
<TD>194.3</TD>
<TD>36.8</TD>
<TD>5.7</TD>
<TD>22.6</TD>
<TD>0.05</TD>
<TD>39.20</TD>
</TR>
</TABLE>
<P>
<SPAN CLASS=Heading3>Balance Sheet - 10 Year Summary (in Millions)</SPAN>
<TABLE WIDTH="100%" BORDER=1 CELLPADDING=1 CELLSPACING=0 RULES=ROWS FRAME=BELOW BORDERCOLOR=#CCCC99 BORDERCOLORDARK=WHITE>
<TR ALIGN=RIGHT VALIGN=BOTTOM CLASS=smallfontreverse><TD>&nbsp;</TD><TD CLASS=smallfontreverse><B>Current Assets</B></TD>
<TD CLASS=smallfontreverse><B>Current Liabilities</B></TD>
<TD CLASS=smallfontreverse><B>Long Term Debt</B></TD>
<TD CLASS=smallfontreverse><B>Shares Outstanding</B></TD>
</TR>
<TR ALIGN=RIGHT>
<TD ALIGN=LEFT>12/99</TD>
<TD>224.5</TD>
<TD>56.1</TD>
<TD>7.5</TD>
<TD>48.5 Mil</TD>
</TR>
<TR ALIGN=RIGHT>
<TD ALIGN=LEFT>12/98</TD>
<TD>228.5</TD>
<TD>53.4</TD>
<TD>7.5</TD>
<TD>47.8 Mil</TD>
</TR>
<TR ALIGN=RIGHT>
<TD ALIGN=LEFT>12/97</TD>
<TD>207.0</TD>
<TD>53.6</TD>
<TD>7.5</TD>
<TD>48.2 Mil</TD>
</TR>
<TR ALIGN=RIGHT>
<TD ALIGN=LEFT>12/96</TD>
<TD>201.5</TD>
<TD>48.2</TD>
<TD>7.5</TD>
<TD>48.8 Mil</TD>
</TR>
<TR ALIGN=RIGHT>
<TD ALIGN=LEFT>12/95</TD>
<TD>164.9</TD>
<TD>55.3</TD>
<TD>7.5</TD>
<TD>48.8 Mil</TD>
</TR>
<TR ALIGN=RIGHT>
<TD ALIGN=LEFT>12/94</TD>
<TD>118.9</TD>
<TD>26.3</TD>
<TD>20.0</TD>
<TD>50.3 Mil</TD>
</TR>
<TR ALIGN=RIGHT>
<TD ALIGN=LEFT>12/93</TD>
<TD>111.9</TD>
<TD>50.9</TD>
<TD>20.0</TD>
<TD>48.8 Mil</TD>
</TR>
<TR ALIGN=RIGHT>
<TD ALIGN=LEFT>12/92</TD>
<TD>129.7</TD>
<TD>22.5</TD>
<TD>0.0</TD>
<TD>48.8 Mil</TD>
</TR>
<TR ALIGN=RIGHT>
<TD ALIGN=LEFT>12/91</TD>
<TD>101.7</TD>
<TD>21.2</TD>
<TD>0.0</TD>
<TD>47.4 Mil</TD>
</TR>
<TR ALIGN=RIGHT>
<TD ALIGN=LEFT>12/90</TD>
<TD>77.9</TD>
<TD>22.6</TD>
<TD>0.0</TD>
<TD>47.4 Mil</TD>
</TR>
</TABLE>

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