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/Ruby 2.4

class OptionParser::Switch

Parent:
Object

Individual switch class. Not important to the user.

Defined within Switch are several Switch-derived classes: NoArgument, RequiredArgument, etc.

Attributes

arg[R]
block[R]
conv[R]
desc[R]
long[R]
pattern[R]
short[R]

Public Class Methods

guess(arg) Show source

Guesses argument style from arg. Returns corresponding OptionParser::Switch class (OptionalArgument, etc.).

# File lib/optparse.rb, line 484
def self.guess(arg)
  case arg
  when ""
    t = self
  when /\A=?\[/
    t = Switch::OptionalArgument
  when /\A\s+\[/
    t = Switch::PlacedArgument
  else
    t = Switch::RequiredArgument
  end
  self >= t or incompatible_argument_styles(arg, t)
  t
end
incompatible_argument_styles(arg, t) Show source
# File lib/optparse.rb, line 499
def self.incompatible_argument_styles(arg, t)
  raise(ArgumentError, "#{arg}: incompatible argument styles\n  #{self}, #{t}",
        ParseError.filter_backtrace(caller(2)))
end
new(pattern = nil, conv = nil, short = nil, long = nil, arg = nil, desc = ([] if short or long), block = Proc.new) Show source
# File lib/optparse.rb, line 508
def initialize(pattern = nil, conv = nil,
               short = nil, long = nil, arg = nil,
               desc = ([] if short or long), block = Proc.new)
  raise if Array === pattern
  @pattern, @conv, @short, @long, @arg, @desc, @block =
    pattern, conv, short, long, arg, desc, block
end
pattern() Show source
# File lib/optparse.rb, line 504
def self.pattern
  NilClass
end

Public Instance Methods

summarize(sdone = [], ldone = [], width = 1, max = width - 1, indent = "") { |indent| ... } Show source

Produces the summary text. Each line of the summary is yielded to the block (without newline).

sdone

Already summarized short style options keyed hash.

ldone

Already summarized long style options keyed hash.

width

Width of left side (option part). In other words, the right side (description part) starts after width columns.

max

Maximum width of left side -> the options are filled within max columns.

indent

Prefix string indents all summarized lines.

# File lib/optparse.rb, line 567
def summarize(sdone = [], ldone = [], width = 1, max = width - 1, indent = "")
  sopts, lopts = [], [], nil
  @short.each {|s| sdone.fetch(s) {sopts << s}; sdone[s] = true} if @short
  @long.each {|s| ldone.fetch(s) {lopts << s}; ldone[s] = true} if @long
  return if sopts.empty? and lopts.empty? # completely hidden

  left = [sopts.join(', ')]
  right = desc.dup

  while s = lopts.shift
    l = left[-1].length + s.length
    l += arg.length if left.size == 1 && arg
    l < max or sopts.empty? or left << ''
    left[-1] << (left[-1].empty? ? ' ' * 4 : ', ') << s
  end

  if arg
    left[0] << (left[1] ? arg.sub(/\A(\[?)=/, '\1') + ',' : arg)
  end
  mlen = left.collect {|ss| ss.length}.max.to_i
  while mlen > width and l = left.shift
    mlen = left.collect {|ss| ss.length}.max.to_i if l.length == mlen
    if l.length < width and (r = right[0]) and !r.empty?
      l = l.to_s.ljust(width) + ' ' + r
      right.shift
    end
    yield(indent + l)
  end

  while begin l = left.shift; r = right.shift; l or r end
    l = l.to_s.ljust(width) + ' ' + r if r and !r.empty?
    yield(indent + l)
  end

  self
end
switch_name() Show source

Main name of the switch.

# File lib/optparse.rb, line 619
def switch_name
  (long.first || short.first).sub(/\A-+(?:\[no-\])?/, '')
end

Private Instance Methods

conv_arg(arg, val = []) Show source

Parses argument, converts and returns arg, block and result of conversion. Yields at semi-error condition instead of raising an exception.

# File lib/optparse.rb, line 545
def conv_arg(arg, val = [])
  if conv
    val = conv.call(*val)
  else
    val = proc {|v| v}.call(*val)
  end
  return arg, block, val
end
parse_arg(arg) { |InvalidArgument, arg| ... } Show source

Parses arg and returns rest of arg and matched portion to the argument pattern. Yields when the pattern doesn't match substring.

# File lib/optparse.rb, line 520
def parse_arg(arg)
  pattern or return nil, [arg]
  unless m = pattern.match(arg)
    yield(InvalidArgument, arg)
    return arg, []
  end
  if String === m
    m = [s = m]
  else
    m = m.to_a
    s = m[0]
    return nil, m unless String === s
  end
  raise InvalidArgument, arg unless arg.rindex(s, 0)
  return nil, m if s.length == arg.length
  yield(InvalidArgument, arg) # didn't match whole arg
  return arg[s.length..-1], m
end

Ruby Core © 1993–2017 Yukihiro Matsumoto
Licensed under the Ruby License.
Ruby Standard Library © contributors
Licensed under their own licenses.