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# File 'lib/option_initializer.rb', line 82
def self.included base
unless base.constants.map(&:to_sym).include?(:OptionInitializing)
base.const_set :OptionInitializing, oi = OptionInitializingTemplate.dup
oi.class_eval do
const_set :VALIDATORS, {}
const_set :ARG_VALIDATORS, {}
end
end
base.class_eval do
class << self
[:option_initializer, :option_initializer!, :option_validator].each do |m|
undef_method(m) if method_defined?(m)
end
end
def base.option_validator sym = nil, &block
raise ArgumentError, "block must be given" unless block
a = sym ? 1 : 2
raise ArgumentError, "invalid arity (expected: #{a})" unless block.arity == a
oi = self.const_get(:OptionInitializing)
oi.const_get(:VALIDATORS)[sym] = block
end
def base.option_initializer *syms
oi = self.const_get(:OptionInitializing)
pairs = syms.inject([]) { |arr, sym|
case sym
when Symbol, String
arr << [sym.to_sym, 1]
when Hash
arr.concat sym.map { |k, v|
case v
when Fixnum
raise ArgumentError, "invalid number of arguments specified for #{k}" if v <= 0
when Range
raise ArgumentError, "invalid number of arguments specified for #{k}" if v.begin < 0
when Set
raise ArgumentError, "empty set of values specified for #{k}" if v.length == 0
when Array
raise ArgumentError, "invalid option definition: `#{v}'" unless v.all? { |e| e.is_a?(Class) || e.is_a?(Set) }
when Class, :*, :&
else
raise ArgumentError, "invalid option definition: `#{v}'"
end
[k.to_sym, v]
}
else
raise ArgumentError, "invalid option definition"
end
}
vals = oi.const_get(:ARG_VALIDATORS)
pairs.each do |pair|
sym, nargs = pair
case nargs
when :&
vals[sym] = proc { |v|
if !v.is_a?(Proc)
raise TypeError, "wrong argument type #{v.class} (expected Proc)"
end
}
when 1
vals.delete sym
when :*
vals[sym] = proc { |v|
if !v.is_a?(Array)
raise ArgumentError, "wrong number of arguments (1 for #{nargs})"
end
}
when Fixnum
vals[sym] = proc { |v|
if !v.is_a?(Array)
raise ArgumentError, "wrong number of arguments (1 for #{nargs})"
elsif nargs != v.length
raise ArgumentError, "wrong number of arguments (#{v.length} for #{nargs})"
end
}
when Range
vals[sym] = proc { |v|
if !v.is_a?(Array)
raise ArgumentError, "wrong number of arguments (1 for #{nargs})"
elsif !nargs.include?(v.length)
raise ArgumentError, "wrong number of arguments (#{v.length} for #{nargs})"
end
}
when Set
vals[sym] = proc { |v|
if !nargs.include?(v)
raise ArgumentError, "invalid option value: `#{v}' (expected one of #{nargs.to_a.inspect})"
end
}
when Array
vals[sym] = proc { |v|
if !v.is_a?(Array)
raise ArgumentError, "wrong number of arguments (1 for #{nargs.length})"
elsif nargs.length != v.length
raise ArgumentError, "wrong number of arguments (#{v.length} for #{nargs.length})"
else
v.zip(nargs).each do |ec|
e, c = ec
case c
when Class
raise TypeError, "wrong argument type #{e.class} (expected #{c})" unless e.is_a?(c)
when Set
unless c.include?(e)
raise ArgumentError, "invalid option value: `#{e}' (expected one of #{c.to_a.inspect})"
end
end
end
end
}
when Class
vals[sym] = proc { |v|
if !v.is_a?(nargs)
raise TypeError, "wrong argument type #{v.class} (expected #{nargs})"
end
}
end
end
pairs.each do |pair|
sym = pair.first
self.class_eval do
singleton = class << self; self end
singleton.send :undef_method, sym if singleton.method_defined?(sym)
singleton.send :define_method, sym do |*v, &b|
oi.new(self, {}, false).send(sym, *v, &b)
end
end
end
oi.class_eval do
pairs.each do |pair|
sym, nargs = pair
undef_method(sym) if method_defined?(sym)
define_method(sym) do |*v, &b|
if nargs == :&
if v.empty?
merge(sym => b)
else
raise ArgumentError, "wrong number of arguments (#{v.length} for 0)"
end
elsif b
raise ArgumentError, "block not expected"
else
case nargs
when 1, Class, Set
if v.length == 1
merge(sym => v.first)
else
raise ArgumentError, "wrong number of arguments (#{v.length} for 1)"
end
else
merge(sym => v)
end
end
end
end
end
end
def base.option_initializer! *syms
option_initializer(*syms)
oi = self.const_get(:OptionInitializing)
oi.class_eval do
include OptionInitializer::MethodCallShortcut
end
end
end
end
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