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Contents
# frozen_string_literal: true
module Parser
# Context of parsing that is represented by a stack of scopes.
#
# Supported states:
# + :class - in the class body (class A; end)
# + :module - in the module body (module M; end)
# + :sclass - in the singleton class body (class << obj; end)
# + :def - in the method body (def m; end)
# + :defs - in the singleton method body (def self.m; end)
# + :block - in the block body (tap {})
# + :lambda - in the lambda body (-> {})
#
class Context
attr_reader :stack
def initialize
@stack = []
freeze
end
def push(state)
@stack << state
end
def pop
@stack.pop
end
def reset
@stack.clear
end
def empty?
@stack.empty?
end
def in_class?
@stack.last == :class
end
def indirectly_in_def?
@stack.include?(:def) || @stack.include?(:defs)
end
def class_definition_allowed?
def_index = stack.rindex { |item| [:def, :defs].include?(item) }
sclass_index = stack.rindex(:sclass)
def_index.nil? || (!sclass_index.nil? && sclass_index > def_index)
end
alias module_definition_allowed? class_definition_allowed?
alias dynamic_const_definition_allowed? class_definition_allowed?
def in_block?
@stack.last == :block
end
def in_lambda?
@stack.last == :lambda
end
def in_dynamic_block?
in_block? || in_lambda?
end
end
end
Version data entries
55 entries across 52 versions & 9 rubygems