######################################################################
class RiError < Exception; end
#
# Break argument into its constituent class or module names, an
# optional method type, and a method name
class NameDescriptor
attr_reader :class_names
attr_reader :method_name
# true and false have the obvious meaning. nil means we don't care
attr_reader :is_class_method
# arg may be
# 1. a class or module name (optionally qualified with other class
# or module names (Kernel, File::Stat etc)
# 2. a method name
# 3. a method name qualified by a optionally fully qualified class
# or module name
#
# We're fairly casual about delimiters: folks can say Kernel::puts,
# Kernel.puts, or Kernel\#puts for example. There's one exception:
# if you say IO::read, we look for a class method, but if you
# say IO.read, we look for an instance method
def initialize(arg)
@class_names = []
separator = nil
tokens = arg.split(/(\.|::|#)/)
# Skip leading '::', '#' or '.', but remember it might
# be a method name qualifier
separator = tokens.shift if tokens[0] =~ /^(\.|::|#)/
# Skip leading '::', but remember we potentially have an inst
# leading stuff must be class names
while tokens[0] =~ /^[A-Z]/
@class_names << tokens.shift
unless tokens.empty?
separator = tokens.shift
break unless separator == "::"
end
end
# Now must have a single token, the method name, or an empty
# array
unless tokens.empty?
@method_name = tokens.shift
# We may now have a trailing !, ?, or = to roll into
# the method name
if !tokens.empty? && tokens[0] =~ /^[!?=]$/
@method_name << tokens.shift
end
if @method_name =~ /::|\.|#/ or !tokens.empty?
raise RiError.new("Bad argument: #{arg}")
end
if separator && separator != '.'
@is_class_method = separator == "::"
end
end
end
# Return the full class name (with '::' between the components)
# or "" if there's no class name
def full_class_name
@class_names.join("::")
end
end
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