Class: Optitron::Parser

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initializeParser

Returns a new instance of Parser.


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# File 'lib/optitron/parser.rb', line 6

def initialize
  @options = []
  @commands = []
  @args = []
  @short_opts = {}
  @help = Help.new(self)
end

Instance Attribute Details

#argsObject (readonly)

Returns the value of attribute args


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# File 'lib/optitron/parser.rb', line 4

def args
  @args
end

#commandsObject (readonly)

Returns the value of attribute commands


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# File 'lib/optitron/parser.rb', line 4

def commands
  @commands
end

#optionsObject (readonly)

Returns the value of attribute options


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# File 'lib/optitron/parser.rb', line 4

def options
  @options
end

#short_optsObject (readonly)

Returns the value of attribute short_opts


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# File 'lib/optitron/parser.rb', line 4

def short_opts
  @short_opts
end

#targetObject

Returns the value of attribute target


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# File 'lib/optitron/parser.rb', line 3

def target
  @target
end

Instance Method Details

#helpObject


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# File 'lib/optitron/parser.rb', line 14

def help
  @help.generate
end

#parse(argv = ARGV) ⇒ Object


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# File 'lib/optitron/parser.rb', line 18

def parse(argv = ARGV)
  tokens = Tokenizer.new(self, argv).tokens
  response = Response.new(self, tokens)
  options = @options 
  args = @args
  unless @commands.empty?
    potential_cmd_toks = tokens.select { |t| t.respond_to?(:lit) }
    if cmd_tok = potential_cmd_toks.find { |t| @commands.assoc(t.lit) }
      tokens.delete(cmd_tok)
      response.command = cmd_tok.lit
      options += @commands.assoc(cmd_tok.lit).last.options
      args = @commands.assoc(cmd_tok.lit).last.args
    elsif !potential_cmd_toks.empty? && @target.respond_to?(:command_missing)
      command = potential_cmd_toks.first.lit
      response.command = 'command_missing'
      @commands << [response.command, Option::Cmd.new(response.command)]
      @commands.assoc(response.command).last.options.insert(-1, *tokens.select { |t| !t.respond_to?(:lit) }.map { |t|
        t.is_a?(Tokenizer::Named) ?
          Option::Opt.new(t.name, nil, :short_name => t.name) :
          Option::Opt.new(t.name, nil, :type => (t.value ? :string : :boolean))
      })
      @commands.assoc(response.command).last.args <<
        Option::Arg.new('command', 'Command name', :type => :string) <<
        Option::Arg.new('args', 'Command arguments', :type => :greedy)
      options += @commands.assoc(response.command).last.options
      args = @commands.assoc(response.command).last.args
    else
      potential_cmd_toks.first ?
        response.add_error('an unknown command', potential_cmd_toks.first.lit) :
        response.add_error('unknown command')
    end
  end
  parse_options(tokens, options, response)
  parse_args(tokens, args, response)
  response.validate
  response
end

#parse_args(tokens, args, response) ⇒ Object


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# File 'lib/optitron/parser.rb', line 68

def parse_args(tokens, args, response)
  args.each { |arg| arg.consume(response, tokens) }
end

#parse_options(tokens, options, response) ⇒ Object


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# File 'lib/optitron/parser.rb', line 56

def parse_options(tokens, options, response)
  options.each do |opt|
    response.params[opt.name] = opt.default if opt.has_default?
    if opt_tok = tokens.find { |tok| opt.match?(tok) }
      opt_tok_index = tokens.index(opt_tok)
      opt.consume(response, tokens)
    elsif opt.required?
      response.add_error("required", opt.name)
    end
  end
end