[Python-Dev] IDLE colorizer
[MRAB <python at mrabarnett.plus.com>[
> A thread on python-ideas is talking about the prefixes of string literals,
> and the regex used in IDLE.
> Line 25 of Lib\idlelib\colorizer.py is:
> stringprefix = r"(?i:\br|u|f|fr|rf|b|br|rb)?"
> which looks slightly wrong to me.
> The \b will apply only to the first choice.
> Shouldn't it be more like:
> stringprefix = r"(?:\b(?i:r|u|f|fr|rf|b|br|rb))?"
I believe the change would capture its real intent. It doesn't seem
to matter a whole lot, though - IDLE isn't a syntax checker, and
applies heuristics to color on the fly based on best guesses. As is,
if you type this fragment into an IDLE shell:
only the last 5 characters get "string colored", presumably because of
the leading \br in the original regexp. But if you type in
the last 6 characters get "string colored", because - as you pointed
out - the \b part of the original regexp has no effect on anything
other than the r following \b.
But in neither case is the fragment legit Python. If you do type in
legit Python, it makes no difference (legit string literals always
start at a word boundary, regardless of whether the regexp checks for