class BooleanFlag

parameter　text　String

The full flag specification text.

parameter　prefix　String

The primary flag prefix (e.g., --flag).

parameter　value　Object | Nil

Reserved for future use.

def initialize(text, prefix, value = nil)
	super(text, prefix)
	
	@value = value
	
	@negated = @prefix.sub(/^--/, "--no-")
	@alternatives = [@negated]
end

parameter　token　String

The token to check.

returns　Boolean

True if the token matches.

def prefix?(token)
	@prefix == token or @negated == token
end

parameter　input　Array(String)

The command-line arguments.

returns　Boolean | Nil

True, false, or nil.

def parse(input)
	if input.first == @prefix
		input.shift
		return true
	elsif input.first == @negated
		input.shift
		return false
	end
end