Mercurial > repos > other > SevenLanguagesInSevenWeeks
annotate 1-Ruby/acts_as_csv_module.rb @ 26:d50ff917c163
Change function calls so methods get patched in anyway
| author | IBBoard <dev@ibboard.co.uk> |
|---|---|
| date | Fri, 20 Jan 2017 21:03:13 +0000 |
| parents | cd874e58dbc5 |
| children | 2ea3b5e9b41b |
| rev | line source |
|---|---|
| 24 | 1 #--- |
| 2 # Excerpted from "Seven Languages in Seven Weeks", | |
| 3 # published by The Pragmatic Bookshelf. | |
| 4 # Copyrights apply to this code. It may not be used to create training material, | |
| 5 # courses, books, articles, and the like. Contact us if you are in doubt. | |
| 6 # We make no guarantees that this code is fit for any purpose. | |
| 7 # Visit http://www.pragmaticprogrammer.com/titles/btlang for more book information. | |
| 8 #--- | |
| 9 module ActsAsCsv | |
| 10 def self.included(base) | |
| 11 base.extend ClassMethods | |
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d50ff917c163
Change function calls so methods get patched in anyway
IBBoard <dev@ibboard.co.uk>
parents:
24
diff
changeset
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12 # The book doesn't do this, but it is possible to add the methods |
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d50ff917c163
Change function calls so methods get patched in anyway
IBBoard <dev@ibboard.co.uk>
parents:
24
diff
changeset
|
13 # without having the inheriting class call a second function to do it |
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d50ff917c163
Change function calls so methods get patched in anyway
IBBoard <dev@ibboard.co.uk>
parents:
24
diff
changeset
|
14 base.acts_as_csv |
| 24 | 15 end |
| 16 | |
| 17 module ClassMethods | |
| 18 def acts_as_csv | |
| 19 include InstanceMethods | |
| 20 end | |
| 21 end | |
| 22 | |
| 23 module InstanceMethods | |
| 24 def read | |
| 25 @csv_contents = [] | |
| 26 filename = self.class.to_s.downcase + '.txt' | |
| 27 file = File.new(filename) | |
| 28 @headers = file.gets.chomp.split(', ') | |
| 29 | |
| 30 file.each do |row| | |
| 31 @csv_contents << row.chomp.split(', ') | |
| 32 end | |
| 33 end | |
| 34 | |
| 35 attr_accessor :headers, :csv_contents | |
| 36 def initialize | |
| 37 read | |
| 38 end | |
| 39 end | |
| 40 end | |
| 41 | |
| 42 class RubyCsv # no inheritance! You can mix it in | |
| 43 include ActsAsCsv | |
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26
d50ff917c163
Change function calls so methods get patched in anyway
IBBoard <dev@ibboard.co.uk>
parents:
24
diff
changeset
|
44 # Also, nothing to do beyond the "include" - it automatically defines the methods! |
| 24 | 45 end |
| 46 | |
| 47 m = RubyCsv.new | |
| 48 puts m.headers.inspect | |
| 49 puts m.csv_contents.inspect | |
| 50 |