dump-parser

I found my self doing this serveral times:

  • Start a project where I have to import data from legacy (CSV) formats

  • Need to parse strings into various formats (Date,Time,Integer,Symbols,Domain-Specific)

  • There are many (more than 40) string based conversion formats per project

  • Maintaining this domain knowlege consistent and error free over project livetime

  • Really hate to maintain “a dsl free big clumb of sequencial and self repeating code”

Goal of this gem is to provide a clean DSL to parse strings (CSV fields) into usable objects.

Example

require 'dump-parser'

DumpParser.register :dd_mm_yyyy_date_time do
  nil_if_empty
  require_format %r(\A(\d{2})\.(\d{2})\.(\d{4})\Z)
  begin
    DateTime.new(match[3].to_i,match[2].to_i,match[1].to_i)
  rescue ArgumentError
    error 'is invalid date'
  end
end

DumpParser.register :required_integer do
  require_format %r(\A\d+\Z)
  value.to_i(10)
end

DumpParser.execute :dd_mm_yyyy_date_time, ""  # returns nil
DumpParser.execute :dd_mm_yyyy_date_time, "10.01.1901"  # returns DateTime.new(1901,01,10)
DumpParser.execute :dd_mm_yyyy_date_time, "invalid"     # raises DumpParser::ParseException.new('dd_mm_yyyy_date: value "invalid" does not match required format')
DumpParser.execute :dd_mm_yyyy_date_time, "31.02.2011"  # raises DumpParser::ParseException.new('dd_mm_yyyy_date: value "31.02.2011" is invalid date')

Contributing to dump-parser

  • Check out the latest master to make sure the feature hasn't been implemented or the bug hasn't been fixed yet

  • Check out the issue tracker to make sure someone already hasn't requested it and/or contributed it

  • Fork the project

  • Start a feature/bugfix branch

  • Commit and push until you are happy with your contribution

  • Make sure to add tests for it. This is important so I don't break it in a future version unintentionally.

  • Please try not to mess with the Rakefile, version, or history. If you want to have your own version, or is otherwise necessary, that is fine, but please isolate to its own commit so I can cherry-pick around it.

Copyright © 2011 Markus Schirp. See LICENSE.txt for further details.