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# frozen_string_literal: true
module GraphQL
module Language
module DefinitionSlice
extend self
def slice(document, name)
definitions = {}
document.definitions.each { |d| definitions[d.name] = d }
names = Set.new
DependencyVisitor.find_definition_dependencies(definitions, name, names)
definitions = document.definitions.select { |d| names.include?(d.name) }
Nodes::Document.new(definitions: definitions)
end
private
class DependencyVisitor < GraphQL::Language::StaticVisitor
def initialize(doc, definitions, names)
@names = names
@definitions = definitions
super(doc)
end
def on_fragment_spread(node, parent)
if fragment = @definitions[node.name]
self.class.find_definition_dependencies(@definitions, fragment.name, @names)
end
super
end
def self.find_definition_dependencies(definitions, name, names)
names.add(name)
visitor = self.new(definitions[name], definitions, names)
visitor.visit
nil
end
end
end
end
end
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