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Contents
# frozen_string_literal: true
module Parser
class StaticEnvironment
FORWARD_ARGS = :FORWARD_ARGS
ANONYMOUS_BLOCKARG = :ANONYMOUS_BLOCKARG
ANONYMOUS_RESTARG = :ANONYMOUS_RESTARG
ANONYMOUS_KWRESTARG = :ANONYMOUS_KWRESTARG
def initialize
reset
end
def reset
@variables = Set[]
@stack = []
end
def extend_static
@stack.push(@variables)
@variables = Set[]
self
end
def extend_dynamic
@stack.push(@variables)
@variables = @variables.dup
self
end
def unextend
@variables = @stack.pop
self
end
def declare(name)
@variables.add(name.to_sym)
self
end
def declared?(name)
@variables.include?(name.to_sym)
end
def declare_forward_args
declare(FORWARD_ARGS)
end
def declared_forward_args?
declared?(FORWARD_ARGS)
end
def declare_anonymous_blockarg
declare(ANONYMOUS_BLOCKARG)
end
def declared_anonymous_blockarg?
declared?(ANONYMOUS_BLOCKARG)
end
def declare_anonymous_restarg
declare(ANONYMOUS_RESTARG)
end
def declared_anonymous_restarg?
declared?(ANONYMOUS_RESTARG)
end
def declare_anonymous_kwrestarg
declare(ANONYMOUS_KWRESTARG)
end
def declared_anonymous_kwrestarg?
declared?(ANONYMOUS_KWRESTARG)
end
def empty?
@stack.empty?
end
end
end
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