BUGS-6634 Filter out X12 control characters

Elements that had X12 control characters weren't filtered out, leading
to potential parsing errors of generated EDI files.

Gemfile.lock

@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    baldr (0.10.5)
+    baldr (0.10.7)
       activesupport
 
 GEM

lib/baldr/renderer/x12.rb

@@ -2,6 +2,9 @@ module Baldr::Renderer::X12
 
   extend self
 
+  #TODO: There is an implicit out-of-band knowledge of which character is used
+  #      for the component separator in envelope.rb ; this needs to be removed
+  #      and the addition/construction of that character should be done here.
   DEFAULT_SEPARATORS = {
     element: '*',
     segment: '~',
@@ -17,6 +20,21 @@ def draw(segments, params = {})
 
   def draw_segment(segment, separators)
     a = [segment.id] + segment.elements.reverse.drop_while{ |i| i.nil? }.reverse
+    #TODO: due to construction methods, if the last element in a segment is nil,
+    #      it won't currently be printed, and if another element requires it,
+    #      no error will be thrown.
+
+    #Due to the TODO item concerning the component separator, it is actively
+    #removed from the below regex
+    substitution_regex =
+      Regexp.new "[#{separators.reject{|k,_| k.to_s == "component" }.values.join}]+"
+
+    #This removes X12 control characters from any segement element that may have
+    #them, removing potential parse conflicts.
+    altered = a.map! { |value|
+      value.nil? ? nil :
+      value.gsub(substitution_regex,"")
+    }
 
     ["#{a.join(separators[:element])}#{separators[:segment]}"] + segment.children.map{ |l| draw_loop(l, separators) }
   end
@@ -25,4 +43,4 @@ def draw_loop(loop, separators)
     loop.segments.map { |s| draw_segment(s, separators) }
   end
 
-end
+end

lib/baldr/version.rb

@@ -1,3 +1,3 @@
 module Baldr
-  VERSION = '0.10.6'
+  VERSION = '0.10.7'
 end

spec/builder_spec.rb

@@ -461,6 +461,51 @@ def segment_n1(parent)
     output.should eq input
   end
 
+  it 'should truncate special characters on draw' do
+    file = 'spec/support/edi_files/valid/204/1.EDI'
+    input = File.read(file)
+
+    #TODO: There is implicit knowledge of how the external file is constructed
+    #      here, as evidenced by the construction & assumption of separators.
+    #      Ideally, all of this should be in code.
+    separators = {
+      component: '>',
+      segment: "\n",
+      element: '*'
+    }
+
+    b = Baldr::Builder.new(
+      #standard_version_number: '',
+      sender_id: '4233372493',
+      sender_id_qualifier: 'ZZ',
+      receiver_id_qualifier: '02',
+      receiver_id: 'ODFL',
+      date_time: DateTime.parse('121109 1642'),
+      interchange_control_number: '000000002',
+      usage_indicator: 'P',
+      acknowledgment_requested: '1',
+      functional_groups_control_numbers: {
+        'SM' => '2'
+      }
+    )
+
+    GoodBuilderFromRealLife.new.build(b)
+
+    b.build_functional_groups
+    #Pull a value and substitute it for the relevant checked separators
+    value = b.envelope.transactions.first['S5'].first['G62'].first['G6204']
+    value = separators[:segment] + separators[:element] + value
+    b.envelope.transactions.first['S5'].first['G62'].first['G6204'] = value
+
+    b.prepare!
+    Baldr::Types.convert_before_render!(b.envelope, Baldr::Grammar::Envelope)
+    Baldr::Validator.validate!(b.envelope, Baldr::Grammar::Envelope)
+
+
+    output = Baldr::Renderer::X12.draw(b.envelope, {separators: separators})
+    output.should eq input
+  end
+
   it 'should throw error if too long and truncate is disabled' do
     b = Baldr::Builder.new(
       #standard_version_number: '',