Stephen Rawls:
# I've only been involved with parrot since last week,
# but I've been learning quickly from all the
# documentation. With the recent activity about lack of
# documentation, I thought I'd try to help out as best I could.
# I've attached a file for an rx.dev candidate.
# Some parts may be wrong, and at some points I even ask
# questions, but there isn't much to rx.[ch], so overall it
# should be a decent rough draft. Below are my questions,
# copied right out of the attached document:
#
# 1) The rx_is_number_character function breaks the
# abstraction and uses the following expression to test
# the argument:
# if (ch >= '0' && ch <= '9')
# It explains that it is "faster to do
# less-than/greater-than"
# My question is: Doesn't this restrict the ability for
# adding different character encodings and languge
# support? What about languages that don't use arabic
# numerals?
It's a speed hack. I'm well aware that it won't work on some languages,
but I figured we can always change it later.
# 2) In the rxinfo struct:
# opcode_t *substfunc;
#
# My first guess was that that is a pointer to the first
# opcode the regex uses, but then I got confused by the
# name 'substfunc.' So basically ... what is it used
# for?
It's unused; originally I was planning to have the regex engine handle
substitutions (and you would pass in a label to call to get the
replacement string), but I changed my mind. Apparently that never
disappeared.
Overall, well done on the file--I think you explained bitmaps better
than I could have. :^)
--Brent Dax <[EMAIL PROTECTED]>
@roles=map {"Parrot $_"} qw(embedding regexen Configure)
He who fights and runs away wasted valuable running time with the
fighting.
