Class: TheFox::Timr::SimpleOptParser

Inherits:
Object
  • Object
show all
Defined in:
lib/timr/simple_opt_parser.rb

Overview

Simple Option Parser

Because OptParse sucks. Parsing arguments should be easy. :(

Covered Usecases

  • -a

  • –all

  • -a –all

  • -a -b val

  • -a -b val cmd

  • -a -b val cmd1 cmd2

  • -a -b val1 val2

  • -a -b val1 val2 cmd1 cmd2

  • -ab

  • -ab val

### Usage “‘ optparser = SimpleOptParser.new optparser.register_option() optparser.register_option() optparser.register_option(, 1) opts = optparser.parse(’-a -b -c val’) “‘

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ SimpleOptParser

Returns a new instance of SimpleOptParser.



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# File 'lib/timr/simple_opt_parser.rb', line 38

def initialize
	#  -a   => 0
	# --all => 0
	#  -b   => 1
	@valid_options = Hash.new
	
	# a   => 0
	# all => 0
	# b   => 1
	# @valid_options_without_prefix = Hash.new
	
	# Parsed Options (+Commands)
	@options = Array.new
	
	# Not Recognized Options
	@unknown_options = Array.new
end

Instance Attribute Details

#options ⇒ Object (readonly)

Parsed Options (+Commands)



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# File 'lib/timr/simple_opt_parser.rb', line 33

def options
  @options
end

#unknown_options ⇒ Object (readonly)

Not Recognized Options



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# File 'lib/timr/simple_opt_parser.rb', line 36

def unknown_options
  @unknown_options
end

Instance Method Details

#parse(args) ⇒ Object

‘args` (Array|String)



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# File 'lib/timr/simple_opt_parser.rb', line 82

def parse(args)
	# Reset previous options.
	@options = []
	
	if args.is_a?(Array)
		pre_argv = args
	else
		pre_argv = args.split(' ')
	end
	
	argv = Array.new
	
	# Pre-process Special Argument (Compact)
	# For example '-abcd' is '-a -b -c -d'.
	pre_argv.each do |arg|
		if arg[0] == '-'
			if arg[1] == '-'
				# Normal --arg
				argv << arg
			else
				if arg.length > 2
					# Special -ab
					arg = arg[1..-1]
					
					# Add each single argument separate.
					# Array ['-abc'] will become ['-a', '-b', '-c'].
					arg.length.times do |n|
						argv << "-#{arg[n]}"
					end
				else
					# Normal -a
					argv << arg
				end
			end
		else
			# Commands, Values, etc
			argv << arg
		end
	end
	
	loop_c = 0 # Limit the loop.
	while argv.length > 0 && loop_c < 1024
		loop_c += 1
		
		arg = argv.shift
		
		if arg[0] == '-'
			if @valid_options[arg]
				# Recognized Argument
				
				number_values = @valid_options[arg]
				
				if number_values == 0
					# No values. Like Command.
					@options << [arg]
				elsif number_values == -1
					# Eat all the arguments. Nom nom nom.
					arg_values = []
					sub_loop_c = 0 # Limit the loop.
					while argv.length > 0 && sub_loop_c < 1024
						sub_loop_c += 1
						
						arg = argv.shift
						
						# When reaching the end.
						unless arg
							break
						end
						
						arg_values << arg
					end
					@options << arg_values
				else
					# n values.
					
					arg_values = []
					sub_loop_c = 0 # Limit the loop.
					while argv.length > 0 && sub_loop_c < number_values && sub_loop_c < 1024
						sub_loop_c += 1
						
						val = argv.shift
						
						# When reaching the end.
						unless val
							raise ArgumentError, "SimpleOptParser: Argument '#{arg}' expects #{number_values} value(s). Found #{sub_loop_c}."
						end
						
						if @valid_options[val]
							raise ArgumentError, "SimpleOptParser: Argument '#{arg}' expects #{number_values} value(s). Found another Argument '#{val}'."
						end
						
						arg_values << val
					end
					
					if arg_values.length != number_values
						raise ArgumentError, "SimpleOptParser: Argument '#{arg}' expects #{number_values} value(s), #{arg_values.length} given."
					end
					
					arg_values.unshift(arg)
					@options << arg_values
				end
			else
				# Unknown Arguments
				# '-ab' arguments will be processed in pre_argv.
				@unknown_options << arg
			end
		else
			# Command
			@options << [arg]
		end
	end
	
	@options
end

#register_option(aliases, number_values = 0) ⇒ Object

‘aliases` (Array)

‘number_values`

  • 0 = no value, just a switch

  • -1 = unlimited

  • n = n values



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# File 'lib/timr/simple_opt_parser.rb', line 63

def register_option(aliases, number_values = 0)
	aliases.each do |ali|
		@valid_options[ali] = number_values
		
		# if ali[0] == '-'
		# 	if ali[1] == '-'
		# 		# --arg
		# 		# Cut the two first characters.
		# 		@valid_options_without_prefix[ali[2..-1]] = number_values
		# 	else
		# 		# -a
		# 		# Cut only the first character.
		# 		@valid_options_without_prefix[ali[1..-1]] = number_values
		# 	end
		# end
	end
end

#verify(opts) ⇒ Object

Do not re-parse. Verify an already parsed array.



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# File 'lib/timr/simple_opt_parser.rb', line 198

def verify(opts)
	opts.each do |opt_ar|
		arg = opt_ar.first
		
		number_values = @valid_options[arg]
		if number_values.nil?
			# Unknown Arguments
		else
			# Argument is valid.
			
			# Check length.
			if number_values == 0
				if opt_ar.length > 0
					raise ArgumentError, "SimpleOptParser: Argument '#{arg}' expects no values, #{opt_ar.length} given."
				end
			elsif number_values == -1
				# Always OK. Keep eating, Pacman.
			else
				if number_values != opt_ar.length
					raise ArgumentError, "SimpleOptParser: Argument '#{arg}' expects #{number_values} value(s), #{opt_ar.length} given."
				end
			end
		end
	end
	
	true
end