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# frozen_string_literal: true
require 'optparse' # Use standard OptionParser class for command-line parsing
module Loxxy
# A command-line option parser for the Loxxy interpreter.
# It is a specialisation of the OptionParser class.
class CLIParser < OptionParser
# @return [Hash{Symbol=>String, Array}]
attr_reader(:parsed_options)
# Constructor.
def initialize(prog_name, ver)
super()
reset(prog_name, ver)
heading
separator 'Options:'
separator ''
add_tail_options
end
def parse!(args)
super
parsed_options
end
private
def reset(prog_name, ver)
@program_name = prog_name
@version = ver
@banner = "Usage: #{prog_name} LOX_FILE [options]"
@parsed_options = {}
end
def description
<<-DESCR
Description:
loxxy is a Lox interpreter, it executes the Lox file(s) given in command-line.
More on Lox Language: https://craftinginterpreters.com/the-lox-language.html
Example:
#{program_name} hello.lox
DESCR
end
def heading
banner
separator ''
separator description
separator ''
end
def add_tail_options
on_tail('--version', 'Display the program version then quit.') do
puts version
exit(0)
end
on_tail('-?', '-h', '--help', 'Display this help then quit.') do
puts help
exit(0)
end
end
end # class
end # module
# End of file
Version data entries
19 entries across 19 versions & 1 rubygems