Re: [gentoo-portage-dev] [PATCH v2] repoman: unroll escaped lines so we can check the entirety of it

[Zac Medico]

On 05/24/2012 12:20 PM, Mike Frysinger wrote:
> +			# A normal line will end in the two bytes: <\> <\n>.  So decoding
> +			# that will result in python thinking the <\n> is being escaped
> +			# and eat the single <\> which makes it hard for us to detect.
> +			# Instead, strip the newline (which we know all lines have), and
> +			# append a <0>.  Then when python escapes it, if the line ended
> +			# in a <\>, we'll end up with a <\0> marker to key off of.  This
> +			# shouldn't be a problem with any valid ebuild ...
> +			line_escaped = (line.rstrip('\n') + '0').decode('string_escape')

That decode('string_escape') method won't work in python3, because the
str object doesn't have a decode method. I think something like this
will work with both python3 and python2:

import codecs

unicode_escape_codec = codecs.lookup('unicode_escape')

def unicode_escape(s):
	return unicode_escape_codec(s)[0]

line_escaped = unicode_escape(line.rstrip('\n') + '0')
-- 
Thanks,
Zac