Class: HQMF::PreconditionConverter

Inherits:
Object
  • Object
show all
Defined in:
lib/hqmf-parser/converter/pass1/precondition_converter.rb

Overview

Class for converting an HQMF 1.0 representation to an HQMF 2.0 representation

Class Method Summary collapse

Class Method Details

.apply_restrictions_to_comparisons(preconditions, restrictions) ⇒ Object 



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# File 'lib/hqmf-parser/converter/pass1/precondition_converter.rb', line 100

def self.apply_restrictions_to_comparisons(preconditions, restrictions)
  comparisons = get_comparison_preconditions(preconditions)
  raise "no comparisons to apply restriction to" if comparisons.empty?
  comparisons.each do |comparison|
    comparison.preconditions.concat(restrictions)
  end
end

.get_comparison_preconditions(preconditions) ⇒ Object 



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# File 'lib/hqmf-parser/converter/pass1/precondition_converter.rb', line 86

def self.get_comparison_preconditions(preconditions)
  comparisons = []
  preconditions.each do |precondition|
    if (precondition.comparison? and !precondition.subset_comparison)
      comparisons << precondition
    elsif(precondition.has_preconditions?)
      comparisons.concat(get_comparison_preconditions(precondition.preconditions))
    else
      raise "precondition with no comparison or children... not valid"
    end
  end
  comparisons
end

.parse_precondition(precondition, data_criteria_converter) ⇒ Object

converts a precondtion to a hqmf model



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# File 'lib/hqmf-parser/converter/pass1/precondition_converter.rb', line 18

def self.parse_precondition(precondition,data_criteria_converter)
  
  # grab child preconditions, and parse recursively
  preconditions = parse_and_merge_preconditions(precondition[:preconditions],data_criteria_converter) if precondition[:preconditions] || []
  
  preconditions_from_restrictions = HQMF::PreconditionExtractor.extract_preconditions_from_restrictions(precondition[:restrictions], data_criteria_converter)
  
  # driv preconditions are preconditions that are the children of an expression
  driv_preconditions = []
  preconditions_from_restrictions.delete_if {|element| driv_preconditions << element if element.is_a? HQMF::Converter::SimpleRestriction and element.operator.type == 'DRIV'}
  
  apply_restrictions_to_comparisons(preconditions, preconditions_from_restrictions) unless preconditions_from_restrictions.empty?

  conjunction_code = convert_logical_conjunction(precondition[:conjunction])

  if (precondition[:expression])
    # this is for things like COUNT
    type = precondition[:expression][:type]
    operator = HQMF::Converter::SimpleOperator.new(HQMF::Converter::SimpleOperator.find_category(type), type, HQMF::Converter::SimpleOperator.parse_value(precondition[:expression][:value]))
    children = []
    if driv_preconditions and !driv_preconditions.empty?
      children = driv_preconditions.map(&:preconditions).flatten
    end
    
    reference = nil
    # take the conjunction code from the parent precondition
    
    restriction = HQMF::Converter::SimpleRestriction.new(operator, nil, children)
    
    comparison_precondition = HQMF::Converter::SimplePrecondition.new(nil,[restriction],reference,conjunction_code, false)
    comparison_precondition.klass = HQMF::Converter::SimplePrecondition::COMPARISON
    comparison_precondition.subset_comparison = true
    preconditions << comparison_precondition
  end
  
  reference = nil
  
  negation = precondition[:negation]
  
  
  if (precondition[:comparison])
    preconditions ||= []
    comparison_precondition = HQMF::PreconditionExtractor.convert_comparison_to_precondition(precondition[:comparison],data_criteria_converter)
    preconditions << comparison_precondition
  end


  if (precondition[:subset])
    # this is for things like FIRST on preconditions
    type = precondition[:subset]
    operator = HQMF::Converter::SimpleOperator.new(HQMF::Converter::SimpleOperator.find_category(type), type, nil)
    children = preconditions
    
    reference = nil
    # take the conjunction code from the parent precondition
    
    restriction = HQMF::Converter::SimpleRestriction.new(operator, nil, children)
    
    comparison_precondition = HQMF::Converter::SimplePrecondition.new(nil,[restriction],reference,conjunction_code, false)
    comparison_precondition.klass = HQMF::Converter::SimplePrecondition::COMPARISON
    preconditions = [comparison_precondition]
  end

  
  HQMF::Converter::SimplePrecondition.new(nil,preconditions,reference,conjunction_code, negation)
  
end

.parse_preconditions(source, data_criteria_converter) ⇒ Object 



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# File 'lib/hqmf-parser/converter/pass1/precondition_converter.rb', line 5

def self.parse_preconditions(source,data_criteria_converter)

  # preconditions = []
  # source.each do |precondition|
  #   preconditions << HQMF::PreconditionConverter.parse_precondition(precondition,data_criteria_converter)
  # end
  # 
  # preconditions
  
  parse_and_merge_preconditions(source,data_criteria_converter)
end