From: Josh Cheek <josh.cheek@...>
Date: 2011-05-28T07:24:28+09:00
Subject: Re: Read symbols from external file

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On Fri, May 27, 2011 at 7:24 AM, Agent Mulder <mbmulder@online.nl> wrote:

> =begin
> Hello,
>
> I parse an array of symbols to output some program code. In reality I
> map ALT, CTRL and SHIFT declarations to VK_KEYS in Java. But the
> principle is the same. It is not a hash, a :symbol_* can appear more
> than once.
>
> The list of symbols and what it applies to (ie SHIFT + VK_HOME) is a
> straight array that I slice() in pairs just before I use it. It is
> declared right on top of the little program below.
>
> I want to read in these ruby symbols from an external file
> "zoo.txt",but I don't know how. Nor do I know how to write
> file zoo.txt.
>
> Can you help me with this?
> =end
>
> [
> :symbol_1,:Zebra,
> :symbol_1,:Tiger,
> :symbol_2,:Pinquin,
> :symbol_2,:Flamingo,
> :symbol_3,:Black_Widow,
> ].
> each_slice(2).each do|b|
> case b[0]
> when:symbol_0 then puts <<_
>
> Symbol Zero: #{b[0]}-> #{b[1]}
> _
> when:symbol_1 then puts <<_
>
> Symbol One: #{b[0]}-> #{b[1]}
> _
> when:symbol_2 then puts <<_
>
> Symbol Two: #{b[0]}-> #{b[1]}
> _
> when:symbol_3 then puts <<_
>
> Symbol Three: #{b[0]}-> #{b[1]}
> _
> end
> end
>
> --
> Posted via http://www.ruby-forum.com/.
>
>

# I think parsing the file is the wrong approach.
# I'd just use a real data format like YAML.
# (I'd probably also not store these as arrays,
# they look like good candidates for hashes or
# structs, because remembering what position 0 is,
# and what position 1 is will become a headache)

require 'yaml'
file = DATA
symbols = YAML.load file

symbols.each do |b|
  case b[0]
  when :symbol_0 then puts "Symbol Zero: #{b[0]} -> #{b[1]}"
  when :symbol_1 then puts "Symbol One: #{b[0]} -> #{b[1]}"
  when :symbol_2 then puts "Symbol Two: #{b[0]} -> #{b[1]}"
  when :symbol_3 then puts "Symbol Three: #{b[0]} -> #{b[1]}"
  end
end


__END__
---
- - :symbol_1
  - :Zebra
- - :symbol_1
  - :Tiger
- - :symbol_2
  - :Pinquin
- - :symbol_2
  - :Flamingo
- - :symbol_3
  - :Black_Widow

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