[R] Wish list: add an "until" or "EOF.marker" parameter to scan & rea dLines

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From: Mark.Bravington@csiro.au
Date: Fri 27 Dec 2002 - 14:37:11 EST 

Message-id: <A8877251964B294BAB5BA1FC58B43FED025B4476@molly.tas.csiro.au>

A bit late for Santa, but on my wish-list nevertheless:

is there any chance that "scan" and "readLines" could be extended to take a
parameter "until" or "EOF.marker", which would be a character string that
(if encountered while reading) would cause the reading to stop, just as if
an end-of-file had been found? [But leaving a connection open, so that
subsequent calls could read the rest of the file.] Compatibility could be
ensured by making "until" default to as.character( NA), which can never be
encountered. If the "until" string isn't encountered when reading, then
reading continues until a real end-of-file (or the "n" parameter is
satisfied).

This would be useful in all sorts of contexts; one example is in processing
a single data file that's made up of multiple segments each of different
formats.

cheers
Mark

*******************************

Mark Bravington
CSIRO (CMIS)
PO Box 1538
Castray Esplanade
Hobart
TAS 7001

phone (61) 3 6232 5118
fax (61) 3 6232 5012
Mark.Bravington@csiro.au

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