Class: GraphQL::Libgraphqlparser::Builder

Inherits:
Object
  • Object
show all
Includes:
GraphQL::Language
Defined in:
lib/graphql/libgraphqlparser/builder.rb

Overview

Keeps a stack of parse results, exposing the latest one. The C parser can call methods on this object, assuming they’ll be applied to the right object.

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Builder

Returns a new instance of Builder.



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# File 'lib/graphql/libgraphqlparser/builder.rb', line 9

def initialize
  @ast_stack = []
end

Instance Method Details

#add_value(string_value) ⇒ Object

This is for convenience from C



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# File 'lib/graphql/libgraphqlparser/builder.rb', line 64

def add_value(string_value)
  current.value = string_value
end

#begin_visit(node_class_name) ⇒ Object 



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# File 'lib/graphql/libgraphqlparser/builder.rb', line 21

def begin_visit(node_class_name)
  # p "--> BEGIN #{node_class_name}"
  node_class = Nodes.const_get(node_class_name)
  node = node_class.new
  case node
  when Nodes::OperationDefinition, Nodes::FragmentDefinition
    current.definitions << node
  when Nodes::VariableDefinition
    current.variables << node
  when Nodes::VariableIdentifier
    if current.is_a?(Nodes::VariableDefinition)
      node = current
    else
      current.value = node
    end
  when Nodes::Directive
    current.directives << node
  when Nodes::Argument
    current.arguments << node
  when Nodes::InlineFragment, Nodes::FragmentSpread, Nodes::Field
    current.selections << node
  when Nodes::TypeName, Nodes::ListType, Nodes::NonNullType
    # Using ||= because FragmentDefinition has already assigned
    # this as a plain string :(
    current.type ||= node
  when Nodes::ArrayLiteral
    # mutability! 🎉
    current.value = node.values
  when Nodes::InputObject
    current.value = node
  end

  @ast_stack.push(node)
  node
end

#current ⇒ Object 



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# File 'lib/graphql/libgraphqlparser/builder.rb', line 17

def current
  @ast_stack.last
end

#document ⇒ Object 



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# File 'lib/graphql/libgraphqlparser/builder.rb', line 13

def document
  @ast_stack.first
end

#end_visit ⇒ Object 



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# File 'lib/graphql/libgraphqlparser/builder.rb', line 57

def end_visit
  removed = @ast_stack.pop
  # p "--> END   #{removed}"
  removed
end