Hi,
I'm trying to generate valid R code using R. Parts of the task is to
read a sequence of characters from file and escape them such that they
can be put in quotation marks to form a valid R code string. Example:
Let the input file be (four rows containing ASCII 0-255 characters):
abcdef<tab>ghijk\nlmno
second row\t\a\\
fourth and so on...
<EOF>
Now, find escapeString() such that the following piece of code
generates a second file called 'file2.txt' which is identical to
'file1.txt':
inStr <- readChar("file1.txt", nchars=999)
esStr <- escapeString(inStr)
rCode <- sprintf('cat(file="file2.txt", "%s")', esStr)
cat(file="foo.R", rCode)
source("foo.R")
For instance, quotation marks has to be escaped in order for 'rCode'
to be valid, same with newlines etc. What's the best way to do this?
Currently I use an ad hoc sequence of gsub() substitutions to do this,
but is there a better way to create the 'rCode' string?
Thanks
Henrik
______________________________________________
R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
