Method: GraphQL::Language::Visitor.make_visit_methods

Defined in:

lib/graphql/language/visitor.rb

.make_visit_methods(ast_node_class) ⇒ Object

We don't use alias here because it breaks super

# File 'lib/graphql/language/visitor.rb', line 167

def self.make_visit_methods(ast_node_class)
  node_method = ast_node_class.visit_method
  children_of_type = ast_node_class.children_of_type
  child_visit_method = :"#{node_method}_children"

  class_eval("    # The default implementation for visiting an AST node.\n    # It doesn't _do_ anything, but it continues to visiting the node's children.\n    # To customize this hook, override one of its make_visit_methods (or the base method?)\n    # in your subclasses.\n    #\n    # @param node [GraphQL::Language::Nodes::AbstractNode] the node being visited\n    # @param parent [GraphQL::Language::Nodes::AbstractNode, nil] the previously-visited node, or `nil` if this is the root node.\n    # @return [Array, nil] If there were modifications, it returns an array of new nodes, otherwise, it returns `nil`.\n    def \#{node_method}(node, parent)\n      if node.equal?(DELETE_NODE)\n        # This might be passed to `super(DELETE_NODE, ...)`\n        # by a user hook, don't want to keep visiting in that case.\n        [node, parent]\n      else\n        new_node = node\n        \#{\n          if method_defined?(child_visit_method)\n            \"new_node = \#{child_visit_method}(new_node)\"\n          elsif children_of_type\n            children_of_type.map do |child_accessor, child_class|\n              \"node.\#{child_accessor}.each do |child_node|\n                new_child_and_node = \#{child_class.visit_method}_with_modifications(child_node, new_node)\n                # Reassign `node` in case the child hook makes a modification\n                if new_child_and_node.is_a?(Array)\n                  new_node = new_child_and_node[1]\n                end\n              end\"\n            end.join(\"\\n\")\n          else\n            \"\"\n          end\n        }\n\n        if new_node.equal?(node)\n          [node, parent]\n        else\n          [new_node, parent]\n        end\n      end\n    end\n\n    def \#{node_method}_with_modifications(node, parent)\n      new_node_and_new_parent = \#{node_method}(node, parent)\n      apply_modifications(node, parent, new_node_and_new_parent)\n    end\n  RUBY\nend\n", __FILE__, __LINE__ + 1)