Created
February 5, 2009 15:25
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class MessagesBuilder | |
def initialize | |
@description = nil | |
@failure = nil | |
end | |
def description(arg = nil, &block) | |
@description = arg || block | |
end | |
def failure(arg = nil, &block) | |
@failure = arg || block | |
end | |
def get(message) | |
instance_variable_get("@#{message}") | |
end | |
end | |
class MatcherBase | |
# Creates a class level instance variable reader in MatcherBase. | |
# | |
class << self; | |
attr_reader :messages_builder; | |
end | |
# Initialize our message_build class level instance variable in every | |
# class that inherit from us. | |
# | |
def self.inherited(base) | |
base.class_eval do | |
@messages_builder = MessagesBuilder.new | |
end | |
end | |
def self.messages | |
yield @messages_builder | |
end | |
def description | |
show_message(:description) | |
end | |
def failure | |
show_message(:failure) | |
end | |
protected | |
def show_message(type) | |
message = self.class.messages_builder.get(type) | |
if message.is_a? Proc | |
message.call | |
elsif message | |
message | |
else | |
"No #{type} message for this matcher! :/" | |
end | |
end | |
end | |
class MyMatcher < MatcherBase | |
messages do |msg| | |
msg.description { "ah #{@legal}" } | |
end | |
@legal = 'não' | |
end | |
class CoolMatcher < MatcherBase | |
messages do |msg| | |
msg.failure { "ah #{@legal}!!!" } | |
end | |
@legal = 'sim' | |
end | |
puts MyMatcher.new.description | |
puts CoolMatcher.new.failure |
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