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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I have a MarkupExpression I am putting together which reads
a given page, checks for a certain value, and if it doesn’t find it then
it writes the value to the end of the page.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I am finding inconsistent results with it where often it
somehow writes the value *<b><span style='font-weight:bold'>before</span></b>*
the read, even though there’s no possibility that I can see that that
could happen based on my code. And the strangest thing is that I have all
this code heavily debugged both with MessageFmt[]/(:messages:) as well as using
straight echo statements. The WikiShEcho() function clearly is *<b><span
style='font-weight:bold'>NOT</span></b>* processing according to both types of
debugging statements and yet the value is getting written to the page before
the WikiShGrep tries to read it?!?!? <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Is there any kind of situation in which directives (like
markup expressions) get processed twice in a single browse of a page? Or
(more surprising) that echo statements could somehow be suppressed during an
earlier invocation of the MX?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I’m completely befuzzled by this – any hints
anybody could give would be greatly appreciated.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>-Peter<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>PS Below is the relevant section of code – if you want
to see more context the whole recipe is at pmwiki/cookbook/wikish – the function
is WikiShOnce(). Again, I clearly see in my debug statements the fact
that WikiShGrep is being invoked and finding the value that shouldn’t get
written until 9 lines later in the WikiShEcho() call. I’m making up
random strings to write to the file, so it’s not like some other part of
the page would be writing the same values… (There are no loops in
this function, neither before nor after this section of code, and this function
is called directly by $MarkupExpr[] stuff… If the MX were being
called in some kind of “preview mode” that would explain the whole
thing, but I’ve never heard of such a thing and I don’t know how
the echo statements would be being suppressed…<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> WikiShGrep($pagename,
array('q'=>true), array("^$pat$", $ControlPage)); </span></font><font
size=2 face=Wingdings><span style='font-size:10.0pt;font-family:Wingdings'>ß</span></font><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> here I read
the page and search for the value<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> if ($WikiShVars['STATUS'] == 0) {<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> # If found then
we shouldn't run again - return false<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>
$WikiShVars['STATUS'] = 1;<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> wdbg(4,"$func:
Returning (a) with STATUS=" . $WikiShVars['STATUS']);<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> return($opt['r']
? '0' : '');<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> } else {<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> # not found -
WRITE the pattern to $WikiShControlPage<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> # if successful
write to $WikiShControlPage then return true<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> WikiShEcho($pagename,
array('stdout'=>$ControlPage, 'stdout_append'=>true),
array("$pat")); </span></font><font size=2 face=Wingdings><span
style='font-size:10.0pt;font-family:Wingdings'>ß</span></font><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> here I
write the value to the page<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> #
$WikiShVars['STATUS'] was set by echo - if it succeeded then we<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> # succeed.
If it didn't succeed then we don't succeed. Thus no<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> # need to check
it or set it.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>
wdbg(4,"$func: Returning (b) with STATUS=" . $WikiShVars['STATUS']);<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> return($opt['r']
? '1' : '');<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> }<o:p></o:p></span></font></p>
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