class OptionParser::Switch
Individual switch class. Not important to the user.
Defined within Switch are several Switch-derived classes: NoArgument, RequiredArgument, etc.
Attributes
Public Class Methods
Guesses argument style from arg
. Returns corresponding OptionParser::Switch class (OptionalArgument, etc.).
# File lib/optparse.rb, line 308 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 lib/optparse.rb, line 323 def self.incompatible_argument_styles(arg, t) raise(ArgumentError, "#{arg}: incompatible argument styles\n #{self}, #{t}", ParseError.filter_backtrace(caller(2))) end
# File lib/optparse.rb, line 332 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
# File lib/optparse.rb, line 328 def self.pattern NilClass end
Public Instance Methods
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 391 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
Main name of the switch.
# File lib/optparse.rb, line 443 def switch_name (long.first || short.first).sub(/\A-+(?:\[no-\])?/, '') end
Private Instance Methods
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 369 def conv_arg(arg, val = []) if conv val = conv.call(*val) else val = proc {|v| v}.call(*val) end return arg, block, val end
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 344 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