calendar parsing

lib/gtfs/calendar.rb

@@ -0,0 +1,12 @@
+module GTFS
+  class Calendar
+    include GTFS::Model
+
+    required_attrs :service_id, :monday, :tuesday, :wednesday, :thursday, :friday, :saturday, :sunday, :start_date, :end_date
+    attr_accessor *attrs
+
+    def self.parse_calendars(data)
+      return parse_models(data)
+    end
+  end
+end

lib/gtfs/model.rb

@@ -6,6 +6,8 @@ def self.included(base)
       base.extend ClassMethods
 
       const_set('PREFIX', '')
+      const_set('OPTIONAL_ATTRS', [])
+      const_set('REQUIRED_ATTRS', [])
 
       def valid?
         !self.class::REQUIRED_ATTRS.any?{|f| self.send(f.to_sym).nil?}

spec/gtfs/calendar_spec.rb

@@ -0,0 +1,14 @@
+require File.expand_path(File.dirname(__FILE__) + '/../spec_helper')
+
+describe GTFS::Calendar do
+  describe 'Calendar.parse_calendars' do
+    let(:header_line) {"service_id,monday,tuesday,wednesday,thursday,friday,saturday,sunday,start_date,end_date\n"}
+    let(:invalid_header_line) {"service_id,,tuesday,,thursday,friday,,sunday,start_date,end_date\n"}
+    let(:valid_line) {"1,1,1,1,1,1,0,0,20110828,20120204\n"}
+    let(:invalid_line) {"1,,1,,1,,0,,,20120204\n"}
+
+    subject {GTFS::Calendar.parse_calendars(source_text)}
+
+    include_examples 'models'
+  end
+end