[Newbie] Variable score

ruby-talk
1

Hi all,
I'm newbie to Ruby. I'm trying to write a small script to parse a text
file

···

#-----------------------------------------------------------------------------------
regexp1 = ....
regexp2 = .....

data.each do |line|
  if regexp1.match(line) then
    var1 = $~[1]
    var2 = $~[2]
  end

  if regexp2.match(line) then
    var3 = $~[1]
    print "#{var1} #{var2} #{var3}\n"
  end

end
#-------------------------------------------------------------------------------------
I can not access to var1 & var2 in 2nd if .... then ... end control.
Any idea for help please,

Thank you in advance,

2

Hi all,
I'm newbie to Ruby. I'm trying to write a small script to parse a text
file

#-----------------------------------------------------------------------------------
regexp1 = ....
regexp2 = .....

var1 = '' #initialize to striung or whatever else you expect the result of the match to be.
var2 = ''

data.each do |line|
  if regexp1.match(line) then
    var1 = $~[1]
    var2 = $~[2]
  end

  if regexp2.match(line) then
    var3 = $~[1]
    print "#{var1} #{var2} #{var3}\n"
  end

end
#-------------------------------------------------------------------------------------
I can not access to var1 & var2 in 2nd if .... then ... end control.
Any idea for help please,

Thank you in advance,

HTH-
-Ezra Zygmuntowicz
Yakima Herald-Republic
WebMaster

509-577-7732
ezra@yakima-herald.com

···

On Dec 6, 2005, at 2:12 PM, vnpenguin@gmail.com wrote:

3

vnpenguin@gmail.com wrote:

Hi all,
I'm newbie to Ruby. I'm trying to write a small script to parse a text
file

#-----------------------------------------------------------------------------------
regexp1 = ....
regexp2 = .....

data.each do |line|
if regexp1.match(line) then
   var1 = $~[1]
   var2 = $~[2]
end

if regexp2.match(line) then
   var3 = $~[1]
   print "#{var1} #{var2} #{var3}\n"
end

end
#-------------------------------------------------------------------------------------
I can not access to var1 & var2 in 2nd if .... then ... end control.
Any idea for help please,

Thank you in advance,

Are you certain that you've matched regexp1 before you've matched regexp2?

Regards,
Matthew

4

vnpenguin@gmail.com schrieb:

#-----------------------------------------------------------------------------------
regexp1 = ....
regexp2 = .....

data.each do |line|
  if regexp1.match(line) then
    var1 = $~[1]
    var2 = $~[2]
  end

  if regexp2.match(line) then
    var3 = $~[1]
    print "#{var1} #{var2} #{var3}\n"
  end

end
#-------------------------------------------------------------------------------------
I can not access to var1 & var2 in 2nd if .... then ... end control.
Any idea for help please,

Do regexp1 and regexp2 match on the same line of data? Or could it be that regexp1 matches first and then regexp2 on a following line? If so, you have to create var1 and var2 outside of the block, as Ezra has shown. Otherwise they are (re)initialized each time the block is executed.

Regards,
Pit

5

Hi,

as others have pointed out, create a reference to var1,var2 before the
block:

# same as your example:

%w( foo bar ).each do |w|
  if w.match(/foo/)
    a="something"
  end
  
  if w.match(/bar/)
    puts a #=> nil
  end
end

# --------------------------------------------------
# this one is OK

a=nil
%w( foo bar ).each do |w|
  if w.match(/foo/)
    a="something"
  end
  
  if w.match(/bar/)
    puts a # => something
  end
end

# --------------------------------------------------

But this is still dangerous, it might lead to hard to find bugs.

Patrick

6

But this is not true, the variables should be visible on the scope of
this block, even if they are first created inside an "if". no?

7

Ahh yes you are right. I misread the source.

-Ezra Zygmuntowicz
Yakima Herald-Republic
WebMaster

509-577-7732
ezra@yakima-herald.com

···

On Dec 6, 2005, at 2:27 PM, ako... wrote:

But this is not true, the variables should be visible on the scope of
this block, even if they are first created inside an "if". no?