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This section makes available the full source code to the Bot class, bot.rb, including extra documentation that RDoc can use. Also included is the source to a basic bot client that you can use to converse with a bot on a one-on-one basis using the keyboard from the command line. As this code is commented, as opposed to the examples so far in this chapter, I recommend you at least browse through the following code to get a feel for how the entire program operates as a set of parts.
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Note You can also find these listings available to download in the Source Code/Download area of
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bot.rb
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Here s the source code for the main Bot class: require 'yaml' require 'wordplay' # A basic implementation of a chatterbot class Bot attr_reader :name # Initializes the bot object, loads in the external YAML data # file and sets the bot's name. Raises an exception if # the data loading process fails. def initialize(options) @name = options[:name] || "Unnamed Bot" begin @data = YAML.load(File.open(options[:data_file]).read) rescue raise "Can't load bot data" end end # Returns a random greeting as specified in the bot's data file def greeting random_response(:greeting) end # Returns a random farewell message as specified in the bot's # data file def farewell random_response(:farewell) end # Responds to input text as given by a user def response_to(input) prepared_input = preprocess(input.downcase) sentence = best_sentence(prepared_input) reversed_sentence = WordPlay.switch_pronouns(sentence) responses = possible_responses(sentence) responses[rand(responses.length)] end
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private # Chooses a random response phrase from the :responses hash # and substitutes metadata into the phrase def random_response(key) random_index = rand(@data[:responses][key].length) @data[:responses][key][random_index].gsub(/\[name\]/, @name) end # Performs preprocessing tasks upon all input to the bot def preprocess(input) perform_substitutions(input) end # Substitutes words and phrases on supplied input as dictated by # the bot's :presubs data def perform_substitutions(input) @data[:presubs].each { |s| input.gsub!(s[0], s[1]) } input end # Using the single word keys from :responses, we search for the # sentence that uses the most of them, as it's likely to be the # 'best' sentence to parse def best_sentence(input) hot_words = @data[:responses].keys.select do |k| k.class == String && k =~ /^\w+$/ end WordPlay.best_sentence(input.sentences, hot_words) end
# Using a supplied sentence, go through the bot's :responses # data set and collect together all phrases that could be # used as responses def possible_responses(sentence) responses = [] # Find all patterns to try to match against @data[:responses].keys.each do |pattern| next unless pattern.is_a (String) # For each pattern, see if the supplied sentence contains # a match. Remove substitution symbols (*) before checking. # Push all responses to the responses array.
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if sentence.match('\b' + pattern.gsub(/\*/, '') + '\b') # If the pattern contains substitution placeholders, # perform the substitutions if pattern.include ('*') responses << @data[:responses][pattern].collect do |phrase| # First, erase everything before the placeholder # leaving everything after it matching_section = sentence.sub(/^.*#{pattern}\s+/, '') # Then substitute the text after the placeholder, with # the pronouns switched phrase.sub('*', WordPlay.switch_pronouns(matching_section)) end else # No placeholders Just add the phrases to the array responses << @data[:responses][pattern] end end end # If there were no matches, add the default ones responses << @data[:responses][:default] if responses.empty # Flatten the blocks of responses to a flat array responses.flatten end end
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