Class: Executable::Parser

Inherits:
Object
  • Object
show all
Defined in:
lib/executable/parser.rb

Overview

The Parser class does all the heavy lifting for Executable.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(cli_class) ⇒ Parser

Returns a new instance of Parser.

Parameters:



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# File 'lib/executable/parser.rb', line 11

def initialize(cli_class)
  @cli_class = cli_class
end

Instance Attribute Details

#cli_class ⇒ Object (readonly)

Returns the value of attribute cli_class.



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# File 'lib/executable/parser.rb', line 15

def cli_class
  @cli_class
end

Instance Method Details

#find_long_option(obj, char) ⇒ Object

TODO:

Sort alphabetically?



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# File 'lib/executable/parser.rb', line 182

def find_long_option(obj, char)
  meths = obj.methods.map{ |m| m.to_s }
  meths = meths.select do |m|
    m.start_with?(char) and (m.end_with?('=') or m.end_with?('!'))
  end
  meths.first
end

#invoke(obj, meth, argv) ⇒ Object 



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# File 'lib/executable/parser.rb', line 192

def invoke(obj, meth, argv)
  m = (Method === meth ? meth : obj.method(meth))
  a = []
  m.arity.abs.times{ a << argv.shift }
  m.call(*a)
end

#parse(argv = ARGV) ⇒ Object

Parse command-line.

Parameters:

  • argv (Array, String) (defaults to: ARGV) —

    command-line arguments



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# File 'lib/executable/parser.rb', line 21

def parse(argv=ARGV)
  # duplicate to make sure ARGV stay intact.
  argv = argv.dup
  argv = parse_shellwords(argv)

  cmd, argv = parse_subcommand(argv)
  cli  = cmd.new
  args = parse_arguments(cli, argv)

  return cli, args
end

#parse_arguments(obj, argv, args = []) ⇒ Array

Parse command line options based on given object.

Parameters:

  • obj (Object) —

    basis for command-line parsing

  • argv (Array, String) —

    command-line arguments

  • args (Array) (defaults to: []) —

    pre-seeded arguments to add to

Returns:

  • (Array) —

    parsed arguments



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# File 'lib/executable/parser.rb', line 70

def parse_arguments(obj, argv, args=[])
  case argv
  when String
    require 'shellwords'
    argv = Shellwords.shellwords(argv)
  #else
  #  argv = argv.dup
  end

  #subc = nil
  #@args = []  #opts, i = {}, 0

  while argv.size > 0
    case arg = argv.shift
    when /=/
      parse_equal(obj, arg, argv, args)
    when /^--/
      parse_long(obj, arg, argv, args)
    when /^-/
      parse_flags(obj, arg, argv, args)
    else
      #if Executable === obj
      #  if cmd_class = obj.class.subcommands[arg]
      #    cmd  = cmd_class.new(obj)
      #    subc = cmd
      #    parse(cmd, argv, args)
      #  else
          args << arg
      #  end
      #end
    end
  end
 
  return args
end

#parse_equal(obj, opt, argv, args) ⇒ Object

Parse equal setting comman-line option.



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# File 'lib/executable/parser.rb', line 109

def parse_equal(obj, opt, argv, args)
  if md = /^[-]*(.*?)=(.*?)$/.match(opt)
    x, v = md[1], md[2]
  else
    raise ArgumentError, "#{x}"
  end
  if obj.respond_to?("#{x}=")
    v = true  if v == 'true'   # yes or on  ?
    v = false if v == 'false'  # no  or off ?
    obj.send("#{x}=", v)
  else
    obj.__send__(:option_missing, x, v) # argv?
  end
end

#parse_flags(obj, opt, argv, args) ⇒ Object

Parse single-dash command-line option.



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# File 'lib/executable/parser.rb', line 150

def parse_flags(obj, opt, argv, args)
  x = opt[1..-1]
  c = 0
  x.split(//).each do |k|
    if obj.respond_to?("#{k}=")
      m = obj.method("#{k}=")
      if obj.respond_to?("#{x}?")
        m.call(true)
      else
        invoke(obj, m, argv) #m.call(argv.shift)
      end
    elsif obj.respond_to?("#{k}!")
      invoke(obj, "#{k}!", argv)
    else
      long = find_long_option(obj, k)
      if long
        if long.end_with?('=') && obj.respond_to?(long.chomp('=')+'?')
          invoke(obj, long, [true])
        else
          invoke(obj, long, argv)
        end
      else
        obj.__send__(:option_missing, x, argv)
      end
    end
  end
end

#parse_long(obj, opt, argv, args) ⇒ Object

Parse double-dash command-line option.



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# File 'lib/executable/parser.rb', line 127

def parse_long(obj, opt, argv, args)
  x = opt.sub(/^\-+/, '') # remove '--'
  if obj.respond_to?("#{x}=")
    m = obj.method("#{x}=")
    if obj.respond_to?("#{x}?")
      m.call(true)
    else
      invoke(obj, m, argv)
    end
  elsif obj.respond_to?("#{x}!")
    invoke(obj, "#{x}!", argv)
  else
    # call even if private method
    obj.__send__(:option_missing, x, argv)
  end
end

#parse_shellwords(argv) ⇒ Object

Make sure arguments are an array. If argv is a String, then parse using Shellwords module.

Parameters:

  • argv (Array, String) —

    commmand-line arguments



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# File 'lib/executable/parser.rb', line 37

def parse_shellwords(argv)
  if String === argv
    require 'shellwords'
    argv = Shellwords.shellwords(argv)
  end
  argv.to_a
end

#parse_subcommand(argv) ⇒ Object 



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# File 'lib/executable/parser.rb', line 48

def parse_subcommand(argv)
  cmd = cli_class
  arg = argv.first

  while c = cmd.subcommands[arg]
    cmd = c
    argv.shift
    arg = argv.first
  end

  return cmd, argv
end

#subcommands ⇒ Hash

Index of subcommands.

Returns:

  • (Hash) —

    name mapped to subcommnd class



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# File 'lib/executable/parser.rb', line 202

def subcommands
  @cli_class.subcommands
end