Initial Commit

.gitignore

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+.bundle/
+log/*.log
+pkg/
+.DS_Store

Gemfile

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+source "http://rubygems.org"
+
+gemspec

Gemfile.lock

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+PATH
+  remote: .
+  specs:
+    csv_validator (0.0.1)
+      activemodel
+
+GEM
+  remote: http://rubygems.org/
+  specs:
+    actionpack (3.2.3)
+      activemodel (= 3.2.3)
+      activesupport (= 3.2.3)
+      builder (~> 3.0.0)
+      erubis (~> 2.7.0)
+      journey (~> 1.0.1)
+      rack (~> 1.4.0)
+      rack-cache (~> 1.2)
+      rack-test (~> 0.6.1)
+      sprockets (~> 2.1.2)
+    activemodel (3.2.3)
+      activesupport (= 3.2.3)
+      builder (~> 3.0.0)
+    activesupport (3.2.3)
+      i18n (~> 0.6)
+      multi_json (~> 1.0)
+    archive-tar-minitar (0.5.2)
+    builder (3.0.0)
+    columnize (0.3.6)
+    diff-lcs (1.1.3)
+    erubis (2.7.0)
+    ffi (1.0.11)
+    guard (1.0.3)
+      ffi (>= 0.5.0)
+      thor (>= 0.14.6)
+    guard-rspec (0.7.3)
+      guard (>= 0.10.0)
+    hike (1.2.1)
+    i18n (0.6.0)
+    journey (1.0.3)
+    json (1.7.3)
+    linecache19 (0.5.12)
+      ruby_core_source (>= 0.1.4)
+    multi_json (1.3.2)
+    rack (1.4.1)
+    rack-cache (1.2)
+      rack (>= 0.4)
+    rack-ssl (1.3.2)
+      rack
+    rack-test (0.6.1)
+      rack (>= 1.0)
+    railties (3.2.3)
+      actionpack (= 3.2.3)
+      activesupport (= 3.2.3)
+      rack-ssl (~> 1.3.2)
+      rake (>= 0.8.7)
+      rdoc (~> 3.4)
+      thor (~> 0.14.6)
+    rake (0.9.2.2)
+    rdoc (3.12)
+      json (~> 1.4)
+    rspec (2.9.0)
+      rspec-core (~> 2.9.0)
+      rspec-expectations (~> 2.9.0)
+      rspec-mocks (~> 2.9.0)
+    rspec-core (2.9.0)
+    rspec-expectations (2.9.0)
+      diff-lcs (~> 1.1.3)
+    rspec-mocks (2.9.0)
+    rspec-rails (2.9.0)
+      actionpack (>= 3.0)
+      activesupport (>= 3.0)
+      railties (>= 3.0)
+      rspec (~> 2.9.0)
+    ruby-debug-base19 (0.11.25)
+      columnize (>= 0.3.1)
+      linecache19 (>= 0.5.11)
+      ruby_core_source (>= 0.1.4)
+    ruby-debug19 (0.11.6)
+      columnize (>= 0.3.1)
+      linecache19 (>= 0.5.11)
+      ruby-debug-base19 (>= 0.11.19)
+    ruby_core_source (0.1.5)
+      archive-tar-minitar (>= 0.5.2)
+    sprockets (2.1.3)
+      hike (~> 1.2)
+      rack (~> 1.0)
+      tilt (~> 1.1, != 1.3.0)
+    thor (0.14.6)
+    tilt (1.3.3)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  csv_validator!
+  guard
+  guard-rspec
+  rake
+  rspec
+  rspec-rails
+  ruby-debug19

Guardfile

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+guard 'rspec', :cli => "-d --color",  :version => 2 do
+  watch(%r{^spec/.+_spec\.rb$})
+  watch(%r{^lib/(.+)\.rb$})     { |m| "spec/lib/#{m[1]}_spec.rb" }
+  watch(%r{^lib/csv_validator/csv_validator.rb$})     { |m| "spec/#{m[1]}_spec.rb" }
+  watch('spec/spec_helper.rb')  { "spec" }
+end
+

MIT-LICENSE

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+Copyright 2012 YOURNAME
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.rdoc

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+= CsvValidator
+
+This project rocks and uses MIT-LICENSE.

Rakefile

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+#!/usr/bin/env rake
+begin
+  require 'bundler/setup'
+rescue LoadError
+  puts 'You must `gem install bundler` and `bundle install` to run rake tasks'
+end
+begin
+  require 'rdoc/task'
+rescue LoadError
+  require 'rdoc/rdoc'
+  require 'rake/rdoctask'
+  RDoc::Task = Rake::RDocTask
+end
+
+RDoc::Task.new(:rdoc) do |rdoc|
+  rdoc.rdoc_dir = 'rdoc'
+  rdoc.title    = 'CsvValidator'
+  rdoc.options << '--line-numbers'
+  rdoc.rdoc_files.include('README.rdoc')
+  rdoc.rdoc_files.include('lib/**/*.rb')
+end
+
+
+
+
+Bundler::GemHelper.install_tasks
+

csv_file_validator.gemspec

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+$:.push File.expand_path("../lib", __FILE__)
+
+# Describe your gem and declare its dependencies:
+Gem::Specification.new do |s|
+  s.name        = "csv_validator"
+  s.version     = "0.0.1"
+  s.authors     = ["TODO: Your name"]
+  s.email       = ["TODO: Your email"]
+  s.homepage    = "TODO"
+  s.summary     = "TODO: Summary of CsvValidator."
+  s.description = "TODO: Description of CsvValidator."
+
+  s.files = Dir["{app,config,db,lib}/**/*"] + ["MIT-LICENSE", "Rakefile", "README.rdoc"]
+
+  s.require_paths = %w(lib)
+  s.add_dependency("activemodel", ">= 0")
+  s.add_development_dependency("rake")
+  s.add_development_dependency("rspec", ">= 0")
+  s.add_development_dependency("rspec-rails")
+  s.add_development_dependency("ruby-debug19")
+  s.add_development_dependency("guard")
+  s.add_development_dependency("guard-rspec")
+
+end

lib/csv_validator.rb

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+require 'csv'
+
+class CsvValidator < ActiveModel::EachValidator
+  @@default_options = {}
+
+  def self.default_options
+    @@default_options
+  end
+
+  def validate_each(record, attribute, value)
+    options = @@default_options.merge(self.options)
+
+    begin
+      csv = CSV.read(value)
+    rescue CSV::MalformedCSVError
+      record.errors.add(attribute, options[:message] || "is not a valid CSV file")
+      return
+    end
+
+    if options[:columns]
+      unless csv[0].length == options[:columns]
+        record.errors.add(attribute, options[:message] || "should have #{options[:columns]} columns")
+      end
+    end
+
+    if options[:max_columns]
+      if csv[0].length > options[:max_columns]
+        record.errors.add(attribute, options[:message] || "should have no more than #{options[:max_columns]} columns")
+      end
+    end
+
+    if options[:min_columns]
+      if csv[0].length < options[:min_columns]
+        record.errors.add(attribute, options[:message] || "should have at least #{options[:min_columns]} columns")
+      end
+    end
+
+    if options[:rows]
+      unless csv.length == options[:rows]
+        record.errors.add(attribute, options[:message] || "should have #{options[:rows]} rows")
+      end
+    end
+
+    if options[:min_rows]
+      if csv.length < options[:min_rows]
+        record.errors.add(attribute, options[:message] || "should have at least #{options[:min_rows]} rows")
+      end
+    end
+
+    if options[:max_rows]
+      if csv.length > options[:max_rows]
+        record.errors.add(attribute, options[:message] || "should have no more than #{options[:max_rows]} rows")
+      end
+    end
+
+    if options[:email]
+      emails = column_to_array(csv, options[:email])
+      invalid_emails = []
+      emails.each do |email|
+        unless email.match /\A[A-Z0-9._%-]+@[A-Z0-9.-]+\.[A-Z]{2,4}\z/i
+          invalid_emails << email
+        end
+      end
+      if invalid_emails.length > 0
+        record.errors.add(attribute, options[:message] || "contains invalid emails (#{invalid_emails.join(', ')})")
+      end
+    end
+
+    if options[:numericality]
+      numbers = column_to_array(csv, options[:numericality])
+      numbers.each do |number|
+        unless is_numeric?(number)
+          record.errors.add(attribute, options[:message] || "contains non-numeric content in column #{options[:numericality]}")
+          return
+        end
+      end
+    end
+
+  end
+
+  private
+
+  def column_to_array(csv, column_index)
+    column_contents = []
+    csv.each do |column|    
+      column_contents << column[column_index].strip
+    end
+    column_contents
+  end
+
+  def is_numeric?(string)
+    Float(string)
+    true 
+  rescue 
+    false
+  end
+
+
+end