Class: JSI::Schema::Ref

Inherits:
Object
  • Object
show all
Includes:
Util::FingerprintHash
Defined in:
lib/jsi/schema/ref.rb

Overview

JSI::Schema::Ref is a reference to another schema (the result of #deref_schema), resolved using a ref URI from a ref schema (the ref URI typically the contents of the ref_schema's "$ref" keyword)

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(ref, ref_schema = nil) ⇒ Ref

Returns a new instance of Ref.

Parameters:

  • ref (String) —

    a reference URI

  • ref_schema (JSI::Schema) (defaults to: nil) —

    a schema from which the reference originated

Raises:

  • (ArgumentError) 


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# File 'lib/jsi/schema/ref.rb', line 9

def initialize(ref, ref_schema = nil)
  raise(ArgumentError, "ref is not a string") unless ref.respond_to?(:to_str)
  @ref = ref
  @ref_uri = Addressable::URI.parse(ref)
  @ref_schema = ref_schema ? Schema.ensure_schema(ref_schema) : nil
end

Instance Attribute Details

#ref ⇒ Object (readonly)

Returns the value of attribute ref.



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# File 'lib/jsi/schema/ref.rb', line 16

def ref
  @ref
end

#ref_schema ⇒ Object (readonly)

Returns the value of attribute ref_schema.



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# File 'lib/jsi/schema/ref.rb', line 20

def ref_schema
  @ref_schema
end

#ref_uri ⇒ Object (readonly)

Returns the value of attribute ref_uri.



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# File 'lib/jsi/schema/ref.rb', line 18

def ref_uri
  @ref_uri
end

Instance Method Details

#deref_schema ⇒ JSI::Schema

finds the schema this ref points to

Returns:

Raises:



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# File 'lib/jsi/schema/ref.rb', line 26

def deref_schema
  return @deref_schema if instance_variable_defined?(:@deref_schema)

  schema_resource_root = nil
  check_schema_resource_root = -> {
    unless schema_resource_root
      raise(Schema::ReferenceError, [
        "cannot find schema by ref: #{ref}",
        ("from: #{ref_schema.pretty_inspect.chomp}" if ref_schema),
      ].compact.join("\n"))
    end
  }

  ref_uri_nofrag = ref_uri.merge(fragment: nil)

  if ref_uri_nofrag.empty?
    unless ref_schema
      raise(Schema::ReferenceError, [
        "cannot find schema by ref: #{ref}",
        "with no ref schema",
      ].join("\n"))
    end

    # the URI only consists of a fragment (or is empty).
    # for a fragment pointer, resolve using Schema#resource_root_subschema on the ref_schema.
    # for a fragment anchor, bootstrap does not support anchors; otherwise use the ref_schema's schema_resource_root.
    schema_resource_root = ref_schema.is_a?(MetaschemaNode::BootstrapSchema) ? nil : ref_schema.schema_resource_root
    resolve_fragment_ptr = ref_schema.method(:resource_root_subschema)
  else
    # find the schema_resource_root from the non-fragment URI. we will resolve any fragment, either pointer or anchor, from there.

    if ref_uri_nofrag.absolute?
      ref_abs_uri = ref_uri_nofrag
    elsif ref_schema && ref_schema.jsi_resource_ancestor_uri
      ref_abs_uri = ref_schema.jsi_resource_ancestor_uri.join(ref_uri_nofrag)
    else
      ref_abs_uri = nil
    end
    if ref_abs_uri
      schema_resource_root = JSI.schema_registry.find(ref_abs_uri)
    end

    unless schema_resource_root
      # HAX for how google does refs and ids
      if ref_schema && ref_schema.jsi_document.respond_to?(:to_hash) && ref_schema.jsi_document['schemas'].respond_to?(:to_hash)
        ref_schema.jsi_document['schemas'].each_key do |k|
          if Addressable::URI.parse(ref_schema.jsi_document['schemas'][k]['id']) == ref_uri_nofrag
            schema_resource_root = ref_schema.resource_root_subschema(['schemas', k])
          end
        end
      end
    end

    check_schema_resource_root.call

    if schema_resource_root.is_a?(Schema)
      resolve_fragment_ptr = schema_resource_root.method(:resource_root_subschema)
    else
      # Note: Schema#resource_root_subschema will reinstantiate nonschemas as schemas.
      # not implemented for remote refs when the schema_resource_root is not a schema.
      resolve_fragment_ptr = -> (ptr) { schema_resource_root.jsi_descendent_node(ptr) }
    end
  end

  fragment = ref_uri.fragment

  if fragment
    begin
      ptr_from_fragment = Ptr.from_fragment(fragment)
    rescue Ptr::PointerSyntaxError
    end
  end

  if ptr_from_fragment
    begin
      result_schema = resolve_fragment_ptr.call(ptr_from_fragment)
    rescue Ptr::ResolutionError
      raise(Schema::ReferenceError, [
        "could not resolve pointer: #{ptr_from_fragment.pointer.inspect}",
        ("from: #{ref_schema.pretty_inspect.chomp}" if ref_schema),
        ("in schema resource root: #{schema_resource_root.pretty_inspect.chomp}" if schema_resource_root),
      ].compact.join("\n"))
    end
  elsif fragment.nil?
    check_schema_resource_root.call
    result_schema = schema_resource_root
  else
    check_schema_resource_root.call

    # find an anchor that resembles the fragment
    result_schemas = schema_resource_root.jsi_anchor_subschemas(fragment)

    if result_schemas.size == 1
      result_schema = result_schemas.first
    elsif result_schemas.size == 0
      raise(Schema::ReferenceError, [
        "could not find schema by fragment: #{fragment.inspect}",
        "in schema resource root: #{schema_resource_root.pretty_inspect.chomp}",
      ].join("\n"))
    else
      raise(Schema::ReferenceError, [
        "found multiple schemas for plain name fragment #{fragment.inspect}:",
        *result_schemas.map { |s| s.pretty_inspect.chomp },
      ].join("\n"))
    end
  end

  Schema.ensure_schema(result_schema, msg: "object identified by uri #{ref} is not a schema:")
  return @deref_schema = result_schema
end

#inspect ⇒ String Also known as: to_s

Returns:

  • (String) 


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# File 'lib/jsi/schema/ref.rb', line 138

def inspect
  %Q(\#<#{self.class.name} #{ref}>)
end

#pretty_print(q) ⇒ void

This method returns an undefined value.

pretty-prints a representation of self to the given printer



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# File 'lib/jsi/schema/ref.rb', line 146

def pretty_print(q)
  q.text '#<'
  q.text self.class.name
  q.text ' '
  q.text ref
  q.text '>'
end