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[netrexx-pipelines] PICKPARSE Stage
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From: Jeff H. <Je...@Je...> - 2020-08-03 20:37:00
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<p>A new stage that complements PARSE: PICKPARSE. This selects
records by relations using Rexx's PARSE:</p>
<p>
<blockquote type="cite">/** pickparse<br>
<tt><br>
</tt><tt> +--ONE--+
+--(2)---------------------------+</tt><tt><br>
</tt><tt>>>--PICKPARSE--+-------+--parse_template_Dstring--v--+--------------------------+--+--><</tt><tt><br>
</tt><tt> +--ALL--+
+--logic_template_Dstring--+</tt><tt><br>
</tt><tt>
+--ELSE_Dstring-(1)--------+</tt><tt><br>
</tt><br>
Records are parsed via the parse_template_delimited_string.<br>
Variables are named $n, where n is 1 to 9.<br>
The values of the variables are put into the
logic_template_delimited_string<br>
replacing $n and evaluated. If TRUE, the record is put out on
the stream<br>
numbered by the dstring's position. The stream for a Dstring of
ELSE is<br>
used if no previous logic Dstring is TRUE. If there is no
specific ELSE,<br>
there is an implied one at the end; if that stream is not
connected, the<br>
record is discarded.<br>
If ONE then the record is put out on, at most, one stream: the
first one<br>
matched. If ALL then the record is put out on all streams
matched.<br>
The parse_template and logic_template(s) follow normal NetRexx
rules.<br>
(1) Implied ELSE after last specified dstring.<br>
(2) Up to 10 logic_Dstrings may be specified to go to up to 11
ouput streams<br>
(including an implied ELSE).<br>
<br>
<br>
Example:<br>
<tt>pickparse /. $1 $2 +3 ./ /$1 = 'UNCLE'/ /$2 = 'SAM'
& $1 = 'UNCLE'/</tt><br>
<br>
*/<br>
</blockquote>
This completes the set of four stages featuring REGEX and PARSE to
select or change records.</p>
<p>Comments, ideas, etc. are requested. Thank you.<br>
</p>
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