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comp.lang.ruby

More Regexp and file load problems

Don Levan

6/28/2007 2:44:00 AM

Hi All,

I am struggling here and would be most appreciative of any help.

I have a regular expression problem I can't seem to figure my way out
of. I had sent a similar request this morning, and gratefully
received two emails from David Black and Axel Etzold. Unfortunately,
I am still having difficulty.

I am trying to extract the font name attribute out of the following
xml (this is an excerpt of a larger file). The weird thing, is that
my regular expression correctly matches the text if I use TextMate's
regular expression 'find in project feature' and with the freeware
Reggy regular expression test tool found on Google code. It also
matches correctly, if I text against a subset of the xml being
parsed. I.E., see this first example.


#!/usr/bin/env ruby
#
# Created by Don Levan on 2007-06-26.
# Copyright (c) 2007. All rights reserved.



string = %q(</TextObj>
</Object>
<ObjectStyle id="0" fontHeight="11" graphicFormat="3843"
fieldBorders="132">
<CharacterStyle mask="16183">
<Font-family codeSet="Roman" fontId="0">Helvetica</Font-family>
<Font-size>9</Font-size>
<Face>256</Face>
<Color>#000000</Color>
</CharacterStyle>")


regexp = Regexp.new(/^\s*<Font-family codeSet=\"\w*\" fontId=\"\d*\">
(\w*)<\/Font-family>\s*$/)

if string =~ regexp
puts "#{$1}"

end


Result: Helvetica




However, if I run this script, there is no result.


#!/usr/bin/env ruby
#
# Created by Don Levan on 2007-06-26.
# Copyright (c) 2007. All rights reserved.




regexp = Regexp.new(/^\s*<Font-family codeSet=\"\w*\" fontId=\"\d*\">
(\w*)<\/Font-family>\s*$/)
file = File.new('/Users/donlevan/Desktop/DDRs/Apple Dealer Price
List.xml')

file.each do |line|
if line =~ regexp
puts "#{$1}"

end
end



I have looked at Hiproct and XML simple, unfortunately I can not get
TextMate configured correctly so I keep getting Loaderrors when I try
to use ruby gems.

Thanks,

Don
2 Answers

Peña, Botp

6/28/2007 5:04:00 AM

0

From: Don Levan [mailto:levandon@gmail.com] :
# file = File.new('/Users/donlevan/Desktop/DDRs/Apple Dealer Price
# List.xml')
#
# file.each do |line|
# if line =~ regexp

since your regex passes the string test, i would suspect the contents of the file itself. possibly the expression is broken into multiple lines..

# puts "#{$1}"
# end
# end


try grepping the file first

root@pc4all:~# grep -i Helvetica test.txt
<Font-family codeSet="Roman" fontId="0">Helvetica</Font-family>

then pass the result to simplified ruby program

root@pc4all:~# cat test.rb
regexp = Regexp.new(/^\s*<Font-family codeSet=\"\w*\" fontId=\"\d*\">(\w*)<\/Font-family>\s*$/)
ARGF.each do |line|
if line =~ regexp
puts "#{$1}"

end
end


root@pc4all:~# grep -i Helvetica test.txt | ruby test.rb
Helvetica

Greg

6/28/2007 5:23:00 AM

0


On Jun 27, 9:44 pm, Don Levan <levan...@gmail.com> wrote:
> Hi All,
>
> I am struggling here and would be most appreciative of any help.
>
> I have a regular expression problem I can't seem to figure my way out
> of. I had sent a similar request this morning, and gratefully
> received two emails from David Black and Axel Etzold. Unfortunately,
> I am still having difficulty.
>
> I am trying to extract the font name attribute out of the following
> xml (this is an excerpt of a larger file). The weird thing, is that
> my regular expression correctly matches the text if I use TextMate's
> regular expression 'find in project feature' and with the freeware
> Reggy regular expression test tool found on Google code. It also
> matches correctly, if I text against a subset of the xml being
> parsed. I.E., see this first example.
>
> #!/usr/bin/env ruby
> #
> # Created by Don Levan on 2007-06-26.
> # Copyright (c) 2007. All rights reserved.
>
> string = %q(</TextObj>
> </Object>
> <ObjectStyle id="0" fontHeight="11" graphicFormat="3843"
> fieldBorders="132">
> <CharacterStyle mask="16183">
> <Font-family codeSet="Roman" fontId="0">Helvetica</Font-family>
> <Font-size>9</Font-size>
> <Face>256</Face>
> <Color>#000000</Color>
> </CharacterStyle>")
>
> regexp = Regexp.new(/^\s*<Font-family codeSet=\"\w*\" fontId=\"\d*\">
> (\w*)<\/Font-family>\s*$/)
>
> if string =~ regexp
> puts "#{$1}"
>
> end
>
> Result: Helvetica
>
> However, if I run this script, there is no result.
>
> #!/usr/bin/env ruby
> #
> # Created by Don Levan on 2007-06-26.
> # Copyright (c) 2007. All rights reserved.
>
> regexp = Regexp.new(/^\s*<Font-family codeSet=\"\w*\" fontId=\"\d*\">
> (\w*)<\/Font-family>\s*$/)
> file = File.new('/Users/donlevan/Desktop/DDRs/Apple Dealer Price
> List.xml')
>
> file.each do |line|
> if line =~ regexp
> puts "#{$1}"
>
> end
> end
>
> I have looked at Hiproct and XML simple, unfortunately I can not get
> TextMate configured correctly so I keep getting Loaderrors when I try
> to use ruby gems.
>
> Thanks,
>
> Don

You use an xml library, possibly rexml
don't forget require 'rubygems'