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whippy-edition/app/lib/scope_transformer.rb

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# frozen_string_literal: true
class ScopeTransformer < Parslet::Transform
class Scope
DEFAULT_TERM = 'all'
DEFAULT_ACCESS = %w(read write).freeze
attr_reader :namespace, :term
def initialize(scope)
@namespace = scope[:namespace]&.to_s
@access = scope[:access] ? [scope[:access].to_s] : DEFAULT_ACCESS.dup
@term = scope[:term]&.to_s || DEFAULT_TERM
end
def key
@key ||= [@namespace, @term].compact.join('/')
end
def access
@access.join('/')
end
def merge(other_scope)
clone.merge!(other_scope)
end
def merge!(other_scope)
raise ArgumentError unless other_scope.namespace == namespace && other_scope.term == term
@access.concat(other_scope.instance_variable_get(:@access))
@access.uniq!
@access.sort!
self
end
end
rule(scope: subtree(:scope)) { Scope.new(scope) }
end