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Versions: 6942
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Contents
# frozen_string_literal: true
module Parser
# Stack that holds names of current arguments,
# i.e. while parsing
# def m1(a = (def m2(b = def m3(c = 1); end); end)); end
# ^
# stack is [:a, :b, :c]
#
# Emulates `p->cur_arg` in MRI's parse.y
#
# @api private
#
class CurrentArgStack
attr_reader :stack
def initialize
@stack = []
freeze
end
def empty?
@stack.size == 0
end
def push(value)
@stack << value
end
def set(value)
@stack[@stack.length - 1] = value
end
def pop
@stack.pop
end
def reset
@stack.clear
end
def top
@stack.last
end
end
end
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