Class: FHIR::Boot::Generator

Inherits:
Object
  • Object
show all
Defined in:
lib/bootstrap/generator.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(auto_setup = true) ⇒ Generator

Returns a new instance of Generator.



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# File 'lib/bootstrap/generator.rb', line 10

def initialize(auto_setup=true)   
  # load the valueset expansions
  @defn = FHIR::Definitions
  # templates is an array
  @templates = []
  setup if auto_setup
end

Instance Attribute Details

#defn ⇒ Object

Returns the value of attribute defn.



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# File 'lib/bootstrap/generator.rb', line 6

def defn
  @defn
end

#lib ⇒ Object

Returns the value of attribute lib.



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# File 'lib/bootstrap/generator.rb', line 5

def lib
  @lib
end

#templates ⇒ Object

templates keeps track of all the templates in context within a given StructureDefinition



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# File 'lib/bootstrap/generator.rb', line 8

def templates
  @templates
end

Instance Method Details

#capFirst(string) ⇒ Object 



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# File 'lib/bootstrap/generator.rb', line 99

def capFirst(string)
  t = String.new(string)
  t[0] = t[0].upcase
  t
end

#generate_class(hierarchy, structureDef, top_level = false) ⇒ Object 



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# File 'lib/bootstrap/generator.rb', line 105

def generate_class(hierarchy,structureDef,top_level=false)
  typeName = structureDef['id']
  constrainedType = structureDef['constrainedType']
  pathType = typeName
  pathType = constrainedType if constrainedType

  template = FHIR::Boot::Template.new([ typeName ],top_level)
  template.hierarchy = hierarchy
  template.kind = structureDef['kind']
  return template if structureDef['snapshot'].nil? || structureDef['snapshot']['element'].nil?

  multipleDataTypes = {}

  # examine the snapshot.elements... move the Element and BackboneElements, 
  # and their children, into separate StructureDefiniton hashes and process as
  # child templates.
  child_templates = [] 
  structureDef['snapshot']['element'].each do |element|
    # skip the first element
    next if element['path']==pathType
    if element['type']
      unique_types = element['type'].map{|t|t['code']}.uniq 
      if unique_types.include?('Element') || unique_types.include?('BackboneElement')
        child_templates << element['path']
      end
    end
  end
  # now build the child templates...
  child_templates.each do |child_name|
    child_fixed_name = capFirst(child_name.gsub("#{typeName}.",''))
    next if child_fixed_name.include?('.')
    child_def = { 'id'=> child_fixed_name, 'snapshot'=>{'element'=>[]} }
    # Copy the element definitions for the child structure
    structureDef['snapshot']['element'].each do |element|
      child_def['snapshot']['element'] << element.clone if element['path'].start_with?("#{child_name}.")
    end
    # Remove the child elements
    child_paths = child_def['snapshot']['element'].map{|e|e['path']}
    # child_paths = child_paths.drop(1)
    structureDef['snapshot']['element'].keep_if do |element|
      !child_paths.include?(element['path'])
    end
    # Rename the child paths
    child_def['snapshot']['element'].each do |element|
      element['path'] = element['path'].gsub(child_name,child_fixed_name)
    end
    # add the child
    child_hierarchy = hierarchy + [ child_fixed_name ]
    child_klass = generate_class(child_hierarchy,child_def)
    template.templates << child_klass
    @templates << child_klass
  end

  # Process the remaining attributes (none of which are Elements or BackboneElements)
  structureDef['snapshot']['element'].each do |element|
    # skip the first element
    next if element['path']==pathType

    field_base_name = element['path'].gsub("#{pathType}.",'')
    # If the element has a type, treat it as a datatype or resource
    # If not, treat it as a reference to an already declared internal class
    if !element['type'].nil?
      # profiles contains a list of profiles if the datatype is Reference or Extension
      profiles = []
      element['type'].select{|t|t['code']=='Reference' || t['code']=='Extension'}.each do |dataType|
        profiles << dataType['profile']
      end
      profiles.select!{|p|!p.nil?}
      profiles.flatten!

      # Calculate fields that have multiple data types
      if element['type'].length > 1
        fieldname = field_base_name.gsub('[x]','')
        unique_types = element['type'].map{|t|t['code']}.uniq
        multipleDataTypes[fieldname] = unique_types if(unique_types.length>1)
      end

      # generate a field for each valid datatype... this is for things like Resource.attribute[x]
      element['type'].map{|t|t['code']}.uniq.each do |dataType|
        capitalized = capFirst(dataType)
        fieldname = field_base_name.gsub('[x]',capitalized)
        field = FHIR::Field.new(fieldname)
        field.path = element['path'].gsub(pathType,typeName)
        field.type = dataType
        field.type = 'Extension' if field.path.end_with?('extension')
        field.type_profiles = profiles if(dataType=='Reference' || dataType=='Extension')
        field.min = element['min']
        field.max = element['max']
        field.max = field.max.to_i
        field.max = '*' if element['max']=='*'

        if ['code','Coding','CodeableConcept'].include?(dataType) && element['binding']
          field.binding = element['binding']
          field.binding['uri'] = field.binding['valueSetUri']
          field.binding['uri'] = field.binding['valueSetReference'] if field.binding['uri'].nil?
          field.binding['uri'] = field.binding['uri']['reference'] if field.binding['uri'].is_a?(Hash)
          field.binding.delete('valueSetUri')
          field.binding.delete('valueSetReference')
          field.binding.delete('description')
          field.binding.delete('extension')
          # set the actual code list
          codes = @defn.get_codes( field.binding['uri'] )
          field.valid_codes = codes if !codes.nil?
          FHIR.logger.warn "  MISSING EXPANSION -- #{field.path} #{field.min}..#{field.max}: #{field.binding['uri']} (#{field.binding['strength']})" if field.valid_codes.empty? && field.binding['uri'] && !field.binding['uri'].end_with?('bcp47') && !field.binding['uri'].end_with?('bcp13.txt')
        elsif ['Element','BackboneElement'].include?(dataType)
          # This is a nested structure or class
          field.type = "#{hierarchy.join('::')}::#{capFirst(field.name)}"
        end

        template.fields << field
      end
    else # If there is no data type, treat the type as a reference to an already declared internal class
      field = FHIR::Field.new(field_base_name)
      field.path = element['path'].gsub(pathType,typeName)
      field.type = element['contentReference']
      field.type = field.type[1..-1] if field.type[0]=='#'
      if (hierarchy.last==field.type)
        # reference to self
        field.type = "#{hierarchy.join('::')}"
      else
        # reference to contained template
        klass = @templates.select{|x|x.hierarchy.last==field.type}.first
        if !klass.nil?
          # the template/child class was declared somewhere else in this class hierarchy
          field.type = klass.hierarchy.join('::')
        else
          # the template/child is a direct ancester (it isn't in @templates yet because it is being defined now)
          field.type = field.type.split('.').map{|x| capFirst(x) }.join('::')
        end
      end
      field.min = element['min']
      field.max = element['max']
      field.max = field.max.to_i
      field.max = '*' if element['max']=='*'
      template.fields << field
    end
  end

  template.constants['MULTIPLE_TYPES'] = multipleDataTypes if !multipleDataTypes.empty?
  template
end

#generate_class_files(folder = @lib, structureDefs) ⇒ Object 



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# File 'lib/bootstrap/generator.rb', line 85

def generate_class_files(folder=@lib,structureDefs)
  structureDefs.each do |structureDef|
    @templates.clear
    typeName = structureDef['id']
    template = generate_class([ typeName ],structureDef,true)
    params = @defn.get_search_parameters(typeName)
    template.constants['SEARCH_PARAMS'] = params if !params.nil?
    filename = File.join(folder,"#{typeName}.rb")
    file = File.open(filename,'w:UTF-8')
    file.write(template.to_s)
    file.close
  end
end

#generate_metadata ⇒ Object 



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# File 'lib/bootstrap/generator.rb', line 30

def generate_metadata
  template = FHIR::Boot::Template.new([],true)
  
  primitives = @defn.get_primitive_types
  hash = {}
  primitives.each do |p|
    field = FHIR::Field.new
    field.name = nil

    # try to find the element that describes the value
    type = p['snapshot']['element'].select{|e| e['path'].end_with?('.value')}.first['type'].first

    # try to find the JSON data type
    begin
      ext = type['_code']['extension'].select{|e| e['url']=='http://hl7.org/fhir/StructureDefinition/structuredefinition-json-type'}.first
      field.type = ext['valueString']
    rescue 
      field.type = 'string'
    end

    # try to find a regex
    begin
      ext = type['extension'].select{|e| e['url']=='http://hl7.org/fhir/StructureDefinition/structuredefinition-regex'}.first
      field.regex = ext['valueString']
    rescue 
    end

    hash[ p['id' ] ] = field.serialize
  end
  template.constants['PRIMITIVES'] = hash

  template.constants['TYPES'] = @defn.get_complex_types.map{|t|t['id']}

  # resources
  template.constants['RESOURCES'] = @defn.get_resource_definitions.map{|r|r['id']}

  filename = File.join(@lib,'fhir','metadata.rb')
  file = File.open(filename,'w:UTF-8')
  file.write(template.to_s)
  file.close
end

#generate_resources ⇒ Object 



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# File 'lib/bootstrap/generator.rb', line 80

def generate_resources
  folder = File.join @lib,'fhir','resources'
  generate_class_files(folder,@defn.get_resource_definitions)
end

#generate_types ⇒ Object 



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# File 'lib/bootstrap/generator.rb', line 72

def generate_types
  folder = File.join @lib,'fhir','types'
  # complex data types start with an uppercase letter
  # and we'll filter out profiles on types (for example, Age is a profile on Quantity)
  complexTypes = @defn.get_complex_types
  generate_class_files(folder,complexTypes)
end

#setup ⇒ Object 



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# File 'lib/bootstrap/generator.rb', line 18

def setup
  # make folders for generated content if they do not exist
  @lib = File.expand_path '..', File.dirname(File.absolute_path(__FILE__))
  Dir.mkdir(File.join(@lib,'fhir')) if !Dir.exists?(File.join(@lib,'fhir'))
  Dir.mkdir(File.join(@lib,'fhir','types')) if !Dir.exists?(File.join(@lib,'fhir','types'))
  Dir.mkdir(File.join(@lib,'fhir','resources')) if !Dir.exists?(File.join(@lib,'fhir','resources'))

  # delete previously generated folder contents
  Dir.glob(File.join(@lib,'fhir','*')).each{|f|File.delete(f) if !File.directory?(f)}
  Dir.glob(File.join(@lib,'fhir','**','*')).each{|f|File.delete(f) if !File.directory?(f)}
end