Class: Optitron::Parser

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ 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

#args ⇒ Object (readonly)

Returns the value of attribute args.



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

def args
  @args
end

#commands ⇒ Object (readonly)

Returns the value of attribute commands.



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

def commands
  @commands
end

#options ⇒ Object (readonly)

Returns the value of attribute options.



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

def options
  @options
end

#short_opts ⇒ Object (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

#target ⇒ Object

Returns the value of attribute target.



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

def target
  @target
end

Instance Method Details

#help ⇒ Object 



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

def help
  @help.generate
end

#parse(args = ARGV) ⇒ Object 



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

def parse(args = ARGV)
  tokens = Tokenizer.new(self, args).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
    else
      puts @help.generate
      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 55

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 43

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