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require 'rgen/ecore/ecore'
require 'json'
require 'andand'
module RGen
module ECore
# ECoreToJson can turn ECore models into their JSON metamodel representations
class ECoreToJson
def initialize
end
def root_elements_to_json_string(root_elements)
JSON.pretty_generate(root_elements.map do |el|
if el.is_a?(RGen::ECore::EPackage)
epackage(el)
elsif el.is_a?(RGen::ECore::EClass)
eclass(el)
else
raise "Not implemented for #{el}"
end
end)
end
def epackage_to_json(package)
epackage(package)
end
def ecore_datatypes
[RGen::ECore::EString, RGen::ECore::EInt, RGen::ECore::ELong, RGen::ECore::EBoolean, RGen::ECore::EFloat,
RGen::ECore::ERubyObject, RGen::ECore::EJavaObject, RGen::ECore::ERubyClass, RGen::ECore::EJavaClass]
.map {|dt| edatatype(dt)}
end
def epackage_to_json_pretty_string(package, append = [])
JSON.pretty_generate([epackage_to_json(package)] + append)
end
def epackage_to_json_string(package, append = [])
JSON.generate([epackage_to_json(package)] + append)
end
def emodelelement(me)
{
:eAnnotations => me.eAnnotations.map { |e| eannotation(e) }
}
end
def enamedelement(ne)
merge(emodelelement(ne), {:name => ne.name})
end
def epackage(package)
merge(enamedelement(package), {
:_class_ref => 'RGen.ECore.EPackage',
:eClassifiers => package.eClassifiers.map do |classifier|
if classifier.is_a?(RGen::ECore::EClass)
eclass(classifier)
elsif classifier.is_a?(RGen::ECore::EEnum)
eenum(classifier)
else
edatatype(classifier)
end
end,
:eSubpackages => package.eSubpackages.map { |sp| epackage(sp) },
:nsURI => package.nsURI,
:nsPrefix => package.nsPrefix
})
end
def eclassifier(classifier)
enamedelement(classifier).merge({
# omit :instanceClassName => classifier.instanceClassName
})
end
def eclass(_class)
merge(eclassifier(_class), {
:_class_ref => 'RGen.ECore.EClass',
:abstract => _class.abstract,
:interface => _class.interface,
:eStructuralFeatures => _class.eStructuralFeatures.map do |sf|
if sf.is_a?(RGen::ECore::EReference)
ereference(sf)
else
eattribute(sf)
end
end,
:eSuperTypes => _class.eSuperTypes.map { |st| {:_ref => ref_id(st)} }
})
end
def edatatype(_datatype)
merge(eclassifier(_datatype), {
:_class_ref => 'RGen.ECore.EDataType',
:serializable => _datatype.serializable,
:instanceClassName => _datatype.instanceClassName
})
end
def eenum(enum)
merge(edatatype(enum), {
:_class_ref => 'RGen.ECore.EEnum',
:eLiterals => enum.eLiterals.map do |l|
merge(enamedelement(l), {
:_class_ref => 'RGen.ECore.EEnumLiteral',
:value => l.value,
})
end
})
end
def eannotation(e)
merge(emodelelement(e), {
:_class_ref => 'RGen.ECore.EAnnotation',
:source => e.source,
:details => e.details.map do |d|
merge({}, {
:_class_ref => 'RGen.ECore.EStringToStringMapEntry',
:key => d.key,
:value => d.value
})
end
})
end
def etypedelement(te)
merge(enamedelement(te), {
:ordered => te.ordered,
:unique => te.unique,
:lowerBound => te.lowerBound,
:upperBound => te.upperBound,
:eType => {:_ref => te.eType ? ref_id(te.eType) : nil}
})
end
def estructuralfeature(sf)
merge(etypedelement(sf), {
:changeable => sf.changeable,
:volatile => sf.volatile,
:transient => sf.transient,
:defaultValueLiteral => sf.defaultValueLiteral,
:unsettable => sf.unsettable,
:derived => sf.derived,
})
end
def eattribute(attr)
merge(estructuralfeature(attr), {
:_class_ref => 'RGen.ECore.EAttribute',
:iD => attr.iD
})
end
def ereference(ref)
merge(estructuralfeature(ref), {
:_class_ref => 'RGen.ECore.EReference',
:containment => ref.containment,
:resolveProxies => ref.resolveProxies,
:eOpposite => ref.eOpposite ? {:_ref => "#{ref_id(ref.eOpposite.eContainer)}.#{ref.eOpposite.name}"} : nil
})
end
def ref_id(obj)
res = ref_parts(obj)
res.join('.')
end
def ref_parts(obj)
return [obj.name] unless obj.andand.eContainer
ref_parts(obj.eContainer) << obj.name
end
def merge(hash, values)
values.each { |k, v| hash[k] = v unless v.nil? }
hash
end
end
end
end
|
