Individual switch class. Not important to the user.
Defined within Switch are several Switch-derived classes: NoArgument, RequiredArgument, etc.
Guesses argument style from arg. Returns corresponding OptionParser::Switch class (OptionalArgument, etc.).
# File optparse.rb, line 288
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
# File optparse.rb, line 303
def self.incompatible_argument_styles(arg, t)
raise(ArgumentError, "#{arg}: incompatible argument styles\n #{self}, #{t}",
ParseError.filter_backtrace(caller(2)))
end
# File optparse.rb, line 312
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
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 optparse.rb, line 371
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] << if left[-1].empty? then ' ' * 4 else ', ' end << 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