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From "Scott Stirling" <scottstirl...@rcn.com>
Subject FilterChains - grep and sed
Date Mon, 02 Dec 2002 06:05:37 GMT
Seems like sed and grep could be implemented as filterreaders (see
<http://jakarta.apache.org/ant/manual/CoreTypes/filterchain.html>).  The
LineContainsRegExp filterreader is already a solid foundation for grep.  A
little more implementation and a few params to support flags for inverse
matching, number of before/after lines of context, ignore-case, etc. and
you'd have 90% of grep.

A little sed "engine" would be a little harder but could also be done.  How
would you do it?  You could pass sed one-liners as param values, or set a
param value to the name of a file to read in with a sed script.  Hmmm.

Scott Stirling



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