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Contents
module GraphQL
module Analysis
class ReducerState
attr_reader :reducer
attr_accessor :memo, :errors
def initialize(reducer, query)
@reducer = reducer
@memo = initialize_reducer(reducer, query)
@errors = []
end
def call(visit_type, irep_node)
@memo = @reducer.call(@memo, visit_type, irep_node)
rescue AnalysisError => err
@errors << err
end
# Respond with any errors, if found. Otherwise, if the reducer accepts
# `final_value`, send it the last memo value.
# Otherwise, use the last value from the traversal.
# @return [Any] final memo value
def finalize_reducer
if @errors.any?
@errors
elsif reducer.respond_to?(:final_value)
reducer.final_value(@memo)
else
@memo
end
end
private
# If the reducer has an `initial_value` method, call it and store
# the result as `memo`. Otherwise, use `nil` as memo.
# @return [Any] initial memo value
def initialize_reducer(reducer, query)
if reducer.respond_to?(:initial_value)
reducer.initial_value(query)
else
nil
end
end
end
end
end
Version data entries
16 entries across 16 versions & 1 rubygems