Hi,
I need to parse a string char by char, if the char is a number it should go
to a array without any modification, however in case of letters they should
be decoded into hexadecimals before they go to the array, for example if I
have:
text = "hello5" the array should be
=> ["68", "65", "6c", "6c",
"6f", "5"]
So only letters should be converted.
I wrote the following code but don''t know what the problem with it:
text = "hello5"
number = /\d/
ntext = []
i = 0
while i < text.length
if text[i].chr=~ number
ntext << text[i].chr
else
ntext << text[i].chr.unpack(''U'')[i].to_s(16)
end
end
It seems to work for the first value only text[0], when replaced with
text[1] or anything else I get:
"in `to_s'': wrong number of arguments (1 for 0)
(ArgumentError)"
So the array ntext only stores the first converted letter, I couldn''t
spot
the problem?!!
Your help is really appreciated.
Regards
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Hi -- On Sat, 8 Mar 2008, AN@S wrote:> Hi, > > I need to parse a string char by char, if the char is a number it should go > to a array without any modification, however in case of letters they should > be decoded into hexadecimals before they go to the array, for example if I > have: > > text = "hello5" the array should be > > => ["68", "65", "6c", "6c", "6f", "5"] > > So only letters should be converted. > > I wrote the following code but don''t know what the problem with it: > > > text = "hello5" > number = /\d/ > ntext = [] > > i = 0 > while i < text.length > if text[i].chr=~ number > ntext << text[i].chr > else > ntext << text[i].chr.unpack(''U'')[i].to_s(16) > end > endOne problem with it is that you don''t increment i :-) The other problem is that you''ve got unpack(''U'')[i] but you mean [0]. Keep in mind, though, that you almost never have to maintain a counter explicitly in Ruby, since the language gives you lots of ways to operate on collections. For example: ntext = text.split(//).map {|char| case char when /\d/ char else "%x" % char.unpack(''U'') end } David -- Upcoming Rails training from David A. Black and Ruby Power and Light: ADVANCING WITH RAILS, April 14-17 2008, New York City CORE RAILS, June 24-27 2008, London (Skills Matter) See http://www.rubypal.com for details. Berlin dates coming soon! --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
Hi David, what is the meaning of "%x" and also '' "%x" % '' Sorry I am so noob. Thank you -- Posted via http://www.ruby-forum.com/. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
Hi -- On Sat, 8 Mar 2008, Visit Indonesia 2008 wrote:> > Hi David, > > what is the meaning of "%x" and also '' "%x" % '' > Sorry I am so noob.It''s a way of generating strings, using interpolated arguments. The target string has %-based format characters, like you''d use with sprintf. You need to provide one argument for each element in the format string. So to print a string and a decimal, you''d do: puts "%d is %s" % [10, "ten"] # 10 is ten %x does a hex conversion: puts "%x in hex is %s", [10, "sixteen"] # a in hex is sixteen David -- Upcoming Rails training from David A. Black and Ruby Power and Light: ADVANCING WITH RAILS, April 14-17 2008, New York City CORE RAILS, June 24-27 2008, London (Skills Matter) See http://www.rubypal.com for details. Berlin dates coming soon! --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
> ntext = text.split(//).map {|char| > case char > when /\d/ > char > else > "%x" % char.unpack(''U'') > end > > }Also as oneliner (1.8 and 1.9) ntext = text.split(//).map {|char| char =~ /\d/ ? char : "%x" % char.unpack("U") } --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---