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|
# frozen_string_literal: true
module GraphQL
module Language
# Like `GraphQL::Language::Visitor` except it doesn't support
# making changes to the document -- only visiting it as-is.
class StaticVisitor
def initialize(document)
@document = document
end
# Visit `document` and all children
# @return [void]
def visit
# `@document` may be any kind of node:
visit_method = @document.visit_method
result = public_send(visit_method, @document, nil)
@result = if result.is_a?(Array)
result.first
else
# The node wasn't modified
@document
end
end
def on_document_children(document_node)
document_node.children.each do |child_node|
visit_method = child_node.visit_method
public_send(visit_method, child_node, document_node)
end
end
def on_field_children(new_node)
new_node.arguments.each do |arg_node| # rubocop:disable Development/ContextIsPassedCop
on_argument(arg_node, new_node)
end
visit_directives(new_node)
visit_selections(new_node)
end
def visit_directives(new_node)
new_node.directives.each do |dir_node|
on_directive(dir_node, new_node)
end
end
def visit_selections(new_node)
new_node.selections.each do |selection|
case selection
when GraphQL::Language::Nodes::Field
on_field(selection, new_node)
when GraphQL::Language::Nodes::InlineFragment
on_inline_fragment(selection, new_node)
when GraphQL::Language::Nodes::FragmentSpread
on_fragment_spread(selection, new_node)
else
raise ArgumentError, "Invariant: unexpected field selection #{selection.class} (#{selection.inspect})"
end
end
end
def on_fragment_definition_children(new_node)
visit_directives(new_node)
visit_selections(new_node)
end
alias :on_inline_fragment_children :on_fragment_definition_children
def on_operation_definition_children(new_node)
new_node.variables.each do |arg_node|
on_variable_definition(arg_node, new_node)
end
visit_directives(new_node)
visit_selections(new_node)
end
def on_argument_children(new_node)
new_node.children.each do |value_node|
case value_node
when Language::Nodes::VariableIdentifier
on_variable_identifier(value_node, new_node)
when Language::Nodes::InputObject
on_input_object(value_node, new_node)
when Language::Nodes::Enum
on_enum(value_node, new_node)
when Language::Nodes::NullValue
on_null_value(value_node, new_node)
else
raise ArgumentError, "Invariant: unexpected argument value node #{value_node.class} (#{value_node.inspect})"
end
end
end
# rubocop:disable Development/NoEvalCop This eval takes static inputs at load-time
# We don't use `alias` here because it breaks `super`
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(<<-RUBY, __FILE__, __LINE__ + 1)
# The default implementation for visiting an AST node.
# It doesn't _do_ anything, but it continues to visiting the node's children.
# To customize this hook, override one of its make_visit_methods (or the base method?)
# in your subclasses.
#
# @param node [GraphQL::Language::Nodes::AbstractNode] the node being visited
# @param parent [GraphQL::Language::Nodes::AbstractNode, nil] the previously-visited node, or `nil` if this is the root node.
# @return [void]
def #{node_method}(node, parent)
#{
if method_defined?(child_visit_method)
"#{child_visit_method}(node)"
elsif children_of_type
children_of_type.map do |child_accessor, child_class|
"node.#{child_accessor}.each do |child_node|
#{child_class.visit_method}(child_node, node)
end"
end.join("\n")
else
""
end
}
end
RUBY
end
[
Language::Nodes::Argument,
Language::Nodes::Directive,
Language::Nodes::DirectiveDefinition,
Language::Nodes::DirectiveLocation,
Language::Nodes::Document,
Language::Nodes::Enum,
Language::Nodes::EnumTypeDefinition,
Language::Nodes::EnumTypeExtension,
Language::Nodes::EnumValueDefinition,
Language::Nodes::Field,
Language::Nodes::FieldDefinition,
Language::Nodes::FragmentDefinition,
Language::Nodes::FragmentSpread,
Language::Nodes::InlineFragment,
Language::Nodes::InputObject,
Language::Nodes::InputObjectTypeDefinition,
Language::Nodes::InputObjectTypeExtension,
Language::Nodes::InputValueDefinition,
Language::Nodes::InterfaceTypeDefinition,
Language::Nodes::InterfaceTypeExtension,
Language::Nodes::ListType,
Language::Nodes::NonNullType,
Language::Nodes::NullValue,
Language::Nodes::ObjectTypeDefinition,
Language::Nodes::ObjectTypeExtension,
Language::Nodes::OperationDefinition,
Language::Nodes::ScalarTypeDefinition,
Language::Nodes::ScalarTypeExtension,
Language::Nodes::SchemaDefinition,
Language::Nodes::SchemaExtension,
Language::Nodes::TypeName,
Language::Nodes::UnionTypeDefinition,
Language::Nodes::UnionTypeExtension,
Language::Nodes::VariableDefinition,
Language::Nodes::VariableIdentifier,
].each do |ast_node_class|
make_visit_methods(ast_node_class)
end
# rubocop:disable Development/NoEvalCop
end
end
end
|
