Class: StructureParser

Inherits:
Object
  • Object
show all
Includes:
Utils
Defined in:
lib/ez7gen/structure_parser.rb

Constant Summary collapse

REGEX_OP =

attr_reader :regExOp, :regExRep

/(?=\[((?:[^\[\]]*|\[\g<1>\])*)\])/
PRNTHS_OP = 
'[]'
REGEX_REP = 
/(?=\{((?:[^{}]*|\{\g<1>\})*)\})/
PRNTHS_REP = 
'{}'

Constants included from Utils

Utils::BASE, Utils::BASE_INDICATOR, Utils::DATA_LOOKUP_MIS, Utils::PRIMARY

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Utils

#blank?, #get_name_without_base, #get_segment_name, #get_type_by_name, #has_html_encoded_ch?, #is_number?, #num_to_nil, #safe_len, #sample_index

Constructor Details

#initialize ⇒ StructureParser

idx = 0



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# File 'lib/ez7gen/structure_parser.rb', line 15

def initialize
  @encodedSegments = []
  @idx = 0
end

Instance Attribute Details

#encodedSegments ⇒ Object

Returns the value of attribute encodedSegments.



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# File 'lib/ez7gen/structure_parser.rb', line 5

def encodedSegments
  @encodedSegments
end

#idx ⇒ Object

Returns the value of attribute idx.



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# File 'lib/ez7gen/structure_parser.rb', line 5

def idx
  @idx
end

Instance Method Details

#handle_groups(segments) ⇒ Object

handle groups in the array of ecnoded segments groups and subgroups organized as Arrays with specific Markers



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# File 'lib/ez7gen/structure_parser.rb', line 52

def handle_groups(segments)
  #find groups and decode the group elements and put them in array
  segments.map!{ |seg|
    if(is_complex_group?(seg))

      # Generate marker for the segment to preserve specifics of type of the group - opt. vs repeating.
      if(!seg.kind_of? Array )
        seg = Marker.gen(seg)
      end

      if(seg.kind_of? Array)# TODO: Refactor, check not needed?
        seg.resolve(@encodedSegments)
      else
        is_number?(seg)? @encodedSegments[it.to_i] : seg
      end
      handle_groups(seg)
      # seg = handle_groups(seg)
    else
      seg
    end
  }
  return segments
end

#has_subgroups?(seg) ⇒ Boolean

checks a segment for subgroups

Returns:

  • (Boolean) 


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# File 'lib/ez7gen/structure_parser.rb', line 77

def has_subgroups?(seg)
  inner = remove_outer_parenthesis(seg)
  # inner segment should have no groups identified by {} or []
  inner =~ /[\[{]/
end

#is_complex_group?(encoded) ⇒ Boolean

check if encoded segment is a group

Returns:

  • (Boolean) 


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# File 'lib/ez7gen/structure_parser.rb', line 167

def is_complex_group?(encoded)

  # most of arrays have already been resolved
  # look inside if any of complex group left unresolved
  # return  false if(encoded.kind_of?(Array))
  if(encoded.kind_of?(Array))
    is_complex = false
    encoded.each{|it|
      is_complex = is_complex_group?(it) ||is_complex
    }
    return is_complex
  end

  # group has an index of encoded optional element
  # isGroupWithEncodedElements = ((encoded =~ /\~\d+\~/) || is_number?(encoded)) ? true: false
  isGroupWithEncodedElements = (encoded =~ /\~\d+\~/) ? true: false
  return isGroupWithEncodedElements if(isGroupWithEncodedElements)

  inner = remove_outer_parenthesis(encoded)
  subGroups = inner.split('~')
  (subGroups.size > 1)? true: false

  # # group consists of all required elements {~MRG~PV1~}, so look ahead for that
  # subGroups = encoded.split(/[~\{\[\}\]]/).delete_if{|it| blank?(it)}
  # isGroupOfRequiredElements = (subGroups.size > 1)? true: false
  #
  # return (isGroupWithEncodedElements || isGroupOfRequiredElements), subGroups
end

#is_group?(str, prnths) ⇒ Boolean

check if there are inside elements of sub-groups defined by the same parenthesis

Returns:

  • (Boolean) 


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# File 'lib/ez7gen/structure_parser.rb', line 151

def is_group?(str, prnths)
  # prnth_mtch = @prnths[0]
  # prnth_mtch = prnths[0]
  (str.scan(prnths[0]).size > 1)# outside paranthesis expected
end

#parenthesis_wrap(m) ⇒ Object

wrap a match in parantesis used to brake structure into sub structures



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# File 'lib/ez7gen/structure_parser.rb', line 162

def parenthesis_wrap(m)
  @prnths.clone.insert(1, m)
end

#process(structure, regEx, prnths) ⇒ Object

process group using regular expression and specific pharenthesis as markers



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# File 'lib/ez7gen/structure_parser.rb', line 112

def process(structure, regEx, prnths)
  groups = []

  # brake up the structure into array of subgroups
  # using recursive regEx
  subGroups = structure.scan(regEx)

  subGroups.each {|subGroup|

    # m = parenthesis_wrap(a.first())
    # group boundaries - parenthesis, stripped by regEx
    # put the parenthesis back for processing
    groupElement = Marker.mark(subGroup.first(), prnths)

    # process an array of matches and substitute subgroups
    if(groups.empty?)
      replace(structure, groupElement)
    else
      if(groups.last().include?(groupElement))
        replace(groups.last, groupElement)
        if(!is_group?(groups.last, prnths)) #done resolving a group
          groups.pop()
        end
      else
        replace(structure, groupElement)
      end
    end

    if (is_group?(groupElement, prnths))
      groups << groupElement
    end

    # resolved group added to encoded segments
    @encodedSegments << groupElement
    @idx +=1
}
end

#process_opt_groups(struct) ⇒ Object

process groups with optional markers - []



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# File 'lib/ez7gen/structure_parser.rb', line 102

def process_opt_groups(struct)
    process(struct, REGEX_OP, PRNTHS_OP)
end

#process_rep_groups(struct) ⇒ Object

process groups with repeating markers - {}



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# File 'lib/ez7gen/structure_parser.rb', line 107

def process_rep_groups(struct)
  process(struct, REGEX_REP, PRNTHS_REP)
end

#process_segments(struct) ⇒ Object

takes a message structure and converts it into array of processed segments, ready for building hl7



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# File 'lib/ez7gen/structure_parser.rb', line 21

def process_segments(struct)
  process_struct(struct)
  handle_groups(@encodedSegments)
end

#process_struct(struct) ⇒ Object 



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# File 'lib/ez7gen/structure_parser.rb', line 26

def process_struct(struct)
  #process original segments and build encoded segmets
  process_opt_groups(struct)
  process_rep_groups(struct)

  #check encoded segments to find and process segments which have subgroups
  @encodedSegments.map!{|seg|
   #has more subgroups
   if(has_subgroups?(seg))
     groupMarker = Marker.whatGroup?(seg)

     #unwrap for recursive processing
     process_struct(groupMarker.unwrap(seg))

     # wrap group back to restore the original segment
     groupMarker.mark(seg)
     # (groupMarker)?groupMarker.mark(seg):seg

   else
      seg
   end
  }
end

#remove_outer_parenthesis(seg) ⇒ Object 



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# File 'lib/ez7gen/structure_parser.rb', line 83

def remove_outer_parenthesis(seg)
  regexOptOuter = /^\[~(.*?)~\]$/
  regExRepOuter = /^{~(.*?)~}$/
  # (seg.scan(REGEX_OP).size()>1 || seg.scan(REGEX_REP).size()>1)
  # look for the outer parenthesis [] - opt
  # innerSeg =  seg.scan(/\[~{~(.*)~}~\]|\[~(.*)~\]|{~(.*)~}/)
  # innerOpt=  seg.scan(/^\[~(.*?)~\]/)
  innerOpt= seg.scan(regexOptOuter)
  innerOpt = (innerOpt.empty?) ? nil : innerOpt.flatten.first

  # look for outer {} - rep
  innerRep = (innerOpt) ? innerOpt.scan(regExRepOuter) : seg.scan(regExRepOuter)
  innerRep = (innerRep.empty?) ? nil : innerRep.flatten.first


  inner = innerRep || innerOpt || seg
end

#replace(str, m) ⇒ Object 



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# File 'lib/ez7gen/structure_parser.rb', line 157

def replace(str, m)
  str.sub!(m, @idx.to_s)
end