From: michaelt <what_is_it_to_do_anything@yahoo.com>
Date: Sat, 6 Feb 2016 22:47:51 +0000 (-0500)
Subject: remarks in pipes-prelude-text
X-Git-Url: https://git.immae.eu/?a=commitdiff_plain;h=cca039badec3240c72a6b773802f3a17aceda001;p=github%2Ffretlink%2Ftext-pipes.git

remarks in pipes-prelude-text
---

diff --git a/Pipes/Prelude/Text.hs b/Pipes/Prelude/Text.hs
index be5b502..29ade4d 100644
--- a/Pipes/Prelude/Text.hs
+++ b/Pipes/Prelude/Text.hs
@@ -55,7 +55,17 @@ THREE
 
    The point of view is very much that of @Pipes.Prelude@. It would still be the same even if
    we did something more sophisticated, like run an ordinary attoparsec 'Text' parser on 
-   each line, as if frequently reasonable.
+   each separate line with @Pipes.Prelude.map ()* , as is frequently reasonable. Here we admit
+   three values from standard input that pass the standard attoparsec @scientific@ number parser,
+   dropping bad parses with @P.concat@:
+
+>>> P.toListM $ stdinLn >->  P.map (A.parseOnly A.scientific) >-> P.concat >-> P.take 3
+1<Enter>
+2<Enter>
+bad<Enter>
+3<Enter>
+[1.0,2.0,3.0]
+
 
    The line-based operations are, however, subject to a number of caveats.
    First, where they read from a handle, they will of course happily