Class: Consoler::Matcher

Inherits:
Object
  • Object
show all
Defined in:
lib/consoler/matcher.rb

Overview

Argument/Options matcher

Given a list of arguments and a list option try to match them

Instance Method Summary collapse

Constructor Details

#initialize(arguments, options) ⇒ Matcher

Create a matcher

Parameters:



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# File 'lib/consoler/matcher.rb', line 14

def initialize(arguments, options)
  @arguments = arguments
  @options = options

  @index = 0
  @matched_options = {}
  @argument_values = []
end

Instance Method Details

#_analyze(arg) ⇒ true? (private)

Analyze a single argument

Parameters:

  • arg (String) —

    Single argument

Returns:

  • (true, nil) —

    true on success, nil on failure



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# File 'lib/consoler/matcher.rb', line 66

def _analyze(arg)
  is_long = false
  is_short = false
  name = nil

  if arg[0..1] == '--' then
    is_long = true
    name = arg[2..-1]
  elsif arg[0] == '-' then
    is_short = true
    name = arg[1..-1]
  end

  # arg is not a long/short option, add to arguments values
  unless is_long or is_short then
    @argument_values.push arg
    return true
  end

  unless name.nil? then
    # get the name of the option, short options use the first character
    option_name = if is_short then
                    name[0]
                  else
                    name
                  end

    option = @options.get option_name

    # no option by this name in options
    return nil if option.nil?

    needs_short = option.is_short
    needs_long = option.is_long

    # see if the type if right, short or long
    if needs_long and not is_long then
      return nil
    elsif needs_short and not is_short then
      return nil
    end

    if is_long then
      if option.is_value then
        # is_value needs a next argument for its value
        return nil if _peek_next.nil?
        @matched_options[name] = _peek_next
        _skip_next
      else
        @matched_options[name] = true
      end
    end

    if is_short then
      if name.size == 1 and option.is_value then
        # is_value needs a next argument for its value
        return nil if _peek_next.nil?
        @matched_options[name] = _peek_next
        _skip_next
      else
        # for every character (short option) increment the option value
        name.split('').each do |n|
          short_option = @options.get n
          return nil if short_option.nil?

          if @matched_options[n].nil? then
            @matched_options[n] = 0
          end

          @matched_options[n] += 1
        end
      end
    end
  end

  return true
end

#_each_optional_before_sorted ⇒ Consoler::Matcher (private)

Loop through the optionals before map

Sorted by number of optionals in a group

Returns:



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# File 'lib/consoler/matcher.rb', line 311

def _each_optional_before_sorted
  @optionals_before.each do |_, optionals|
    tmp = []
    optionals.each do |optional_index, before|
      tmp.push({
        count: before.size,
        index: optional_index,
      })
    end

    tmp.sort! { |a, b| b[:count] - a[:count] }.each do |item|
      yield optionals[item[:index]]
    end
  end

  self
end

#_fill_defaults ⇒ Consoler::Matcher (private)

Give all unmatched optional options there default value

Returns:



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# File 'lib/consoler/matcher.rb', line 294

def _fill_defaults
  @options.each do |option|
    if option.is_optional then
      unless @matched_options.has_key? option.name then
        @matched_options[option.name] = option.default_value
      end
    end
  end

  self
end

#_loop_args {|String| ... } ⇒ Consoler::Matcher (private)

Loop through the arguments

Yields:

  • (String) —

    An argument

Returns:



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# File 'lib/consoler/matcher.rb', line 148

def _loop_args
  @index = 0
  size = @arguments.args.size

  # use an incrementing index, to be able to peek to the next in the list
  # and to skip an item
  while @index < size do
    yield @arguments.args[@index]

    _skip_next
  end

  self
end

#_match_arguments ⇒ Array<String> (private)

Match arguments to defined option arguments

Returns:

  • (Array<String>) —

    The remaining args



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# File 'lib/consoler/matcher.rb', line 187

def _match_arguments
  @optionals_before = {}
  @optionals_before_has_remaining = false

  argument_values_index = 0

  _match_arguments_optionals_before

  @optionals_before.each do |mandatory_arg_name, optionals|
    # fill the optional argument option with a value if there are enough
    # arguments supplied (info available from optionals map)
    optionals.each do |_, optional|
      optional.each do |before|
        if before[:included] then
          @matched_options[before[:name]] = @argument_values[argument_values_index]
          argument_values_index += 1
        end
      end
    end

    # only fill mandatory argument if its not the :REMAINING key
    if mandatory_arg_name != :REMAINING then
      @matched_options[mandatory_arg_name] = @argument_values[argument_values_index]
      argument_values_index += 1
    end
  end

  remaining = []

  # left over arguments
  while argument_values_index < @argument_values.size do
    remaining.push @argument_values[argument_values_index]
    argument_values_index += 1
  end

  remaining
end

#_match_arguments_optionals_before ⇒ Consoler::Matcher (private)

Create a map of all optionals and before which mandatory argument they appear

Returns:



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# File 'lib/consoler/matcher.rb', line 228

def _match_arguments_optionals_before
  @optionals_before = {}
  tracker = {}

  @options.each do |option, key|
    next unless option.is_argument

    if option.is_optional then
      # setup tracker for optional group
      tracker[option.is_optional] = [] if tracker[option.is_optional].nil?

      # mark all optionals as not-included
      tracker[option.is_optional].push({
        included: false,
        name: option.name,
      })
    else
      @optionals_before[option.name] = tracker
      tracker = {}
    end
  end

  # make sure all optionals are accounted for in the map
  if tracker != {} then
    # use a special key so we can handle it differently in the filling process
    @optionals_before[:REMAINING] = tracker
    @optionals_before_has_remaining = true
  end

  _match_arguments_options_before_matcher

  self
end

#_match_arguments_options_before_matcher ⇒ Consoler::Matcher (private)

Match remaining args against the optionals map

Returns:



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# File 'lib/consoler/matcher.rb', line 265

def _match_arguments_options_before_matcher
  # number of arguments that are needed to fill our mandatory argument options
  mandatories_matched = @optionals_before.size

  # there are optionals at the end of the options, don't match the void
  if @optionals_before_has_remaining then
    mandatories_matched -= 1
  end

  total = 0

  # loop through optional map
  _each_optional_before_sorted do |before|
    # are there enough arguments left to fill this optional group
    if (total + before.size + mandatories_matched) <= @argument_values.size then
      total += before.size

      before.each do |val|
        val[:included] = true;
      end
    end
  end

  self
end

#_peek_next ⇒ String? (private)

Peek at the next argument

Only useful inside #_loop_args

Returns:

  • (String, nil) 


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# File 'lib/consoler/matcher.rb', line 168

def _peek_next
  @arguments.args[@index + 1]
end

#_skip_next ⇒ nil, Consoler::Matcher (private)

Skip to the next argument

Useful if you use a peeked argument

Returns:



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# File 'lib/consoler/matcher.rb', line 178

def _skip_next
  @index += 1

  self
end

#match ⇒ Hash?

Match arguments against options

Returns:

  • (Hash, nil) —

    Matched information, or nil is returned when there was no match



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# File 'lib/consoler/matcher.rb', line 26

def match
  parse_options = true

  _loop_args do |arg|
    unless parse_options then
      @argument_values.push arg
      next
    end

    # when "argument" is --, then stop parsing the rest of the arguments
    # and treat the rest as regular arguments
    if arg == '--' then
      parse_options = false
      next
    end

    analyzed = _analyze arg

    if analyzed.nil?
      return nil
    end
  end

  remaining = _match_arguments
  _fill_defaults

  if @matched_options.size == @options.size then
    @matched_options['remaining'] = remaining
    return @matched_options
  end

  return nil
end