Retry limit and mention separation

lib/twitter_ebooks/model.rb

@@ -7,7 +7,7 @@ require 'digest/md5'
 
 module Ebooks
   class Model
-    attr_accessor :hash, :sentences, :generator, :keywords
+    attr_accessor :hash, :sentences, :mentions, :keywords
 
     def self.consume(txtpath)
       Model.new.consume(txtpath)
@@ -22,23 +22,44 @@ module Ebooks
       @hash = Digest::MD5.hexdigest(File.read(txtpath))
 
       text = File.read(txtpath)
-      log "Removing commented lines and mention tokens"
+      log "Removing commented lines and sorting mentions"
 
       lines = text.split("\n")
       keeping = []
+      mentions = []
       lines.each do |l|
-        next if l.start_with?('#') || l.include?('RT')
-        processed = l.split.reject { |w| w.include?('@') || w.include?('http') }
-        keeping << processed.join(' ')
+        next if l.start_with?('#') # Remove commented lines
+        next if l.include?('RT') || l.include?('MT') # Remove soft retweets
+        
+        if l.include?('@')
+          mentions << l
+        else
+          keeping << l
+        end
       end
-      text = NLP.normalize(keeping.join("\n"))
+      text = NLP.normalize(keeping.join("\n")) # Normalize weird characters
+      mention_text = NLP.normalize(mentions.join("\n"))
 
       log "Segmenting text into sentences"
 
-      sentences = NLP.sentences(text)
+      statements = NLP.sentences(text)
+      mentions = NLP.sentences(mention_text)
 
-      log "Tokenizing #{sentences.length} sentences"
-      @sentences = sentences.map { |sent| NLP.tokenize(sent) }
+      log "Tokenizing #{statements.length} statements and #{mentions.length} mentions"
+      @sentences = []
+      @mentions = []
+
+      statements.each do |s|
+        @sentences << NLP.tokenize(s).reject do |t|
+          t.start_with?('@') || t.start_with?('http')
+        end
+      end
+
+      mentions.each do |s|
+        @mentions << NLP.tokenize(s).reject do |t|
+          t.start_with?('@') || t.start_with?('http')
+        end
+      end
 
       log "Ranking keywords"
       @keywords = NLP.keywords(@sentences)
@@ -72,38 +93,55 @@ module Ebooks
       tweet.length <= limit && !NLP.unmatched_enclosers?(tweet)
     end
 
-    def make_statement(limit=140, generator=nil)
+    def make_statement(limit=140, generator=nil, retry_limit=10)
       responding = !generator.nil?
       generator ||= SuffixGenerator.build(@sentences)
+
+      retries = 0
       tweet = ""
 
       while (tokens = generator.generate(3, :bigrams)) do
         next if tokens.length <= 3 && !responding
         break if valid_tweet?(tokens, limit)
+
+        retries += 1
+        break if retries >= retry_limit
       end
 
-      if @sentences.include?(tokens) && tokens.length > 3 # We made a verbatim tweet by accident
+      if verbatim?(tokens) && tokens.length > 3 # We made a verbatim tweet by accident
         while (tokens = generator.generate(3, :unigrams)) do
-          break if valid_tweet?(tokens, limit) && !@sentences.include?(tokens)
+          break if valid_tweet?(tokens, limit) && !verbatim?(tokens)
+
+          retries += 1
+          break if retries >= retry_limit
         end
       end
 
       tweet = NLP.reconstruct(tokens)
 
+      if retries >= retry_limit
+        log "Unable to produce valid non-verbatim tweet; using \"#{tweet}\""
+      end
+
       fix tweet
     end
 
+    # Test if a sentence has been copied verbatim from original
+    def verbatim?(tokens)
+      @sentences.include?(tokens) || @mentions.include?(tokens)
+    end
+
     # Finds all relevant tokenized sentences to given input by
     # comparing non-stopword token overlaps
-    def relevant_sentences(input)
+    def find_relevant(sentences, input)
       relevant = []
       slightly_relevant = []
 
-      tokenized = NLP.tokenize(input)
+      tokenized = NLP.tokenize(input).map(&:downcase)
 
-      @sentences.each do |sent|
+      sentences.each do |sent|
         tokenized.each do |token|
-          if sent.include?(token)
+          if sent.map(&:downcase).include?(token)
             relevant << sent unless NLP.stopword?(token)
             slightly_relevant << sent
           end
@@ -115,9 +153,9 @@ module Ebooks
 
     # Generates a response by looking for related sentences
     # in the corpus and building a smaller generator from these
-    def make_response(input, limit=140)
-      # First try 
-      relevant, slightly_relevant = relevant_sentences(input)
+    def make_response(input, limit=140, sentences=@mentions)
+      # Prefer mentions
+      relevant, slightly_relevant = find_relevant(sentences, input)
 
       if relevant.length >= 3
         generator = SuffixGenerator.build(relevant)
@@ -125,6 +163,8 @@ module Ebooks
       elsif slightly_relevant.length >= 5
         generator = SuffixGenerator.build(slightly_relevant)
         make_statement(limit, generator)
+      elsif sentences.equal?(@mentions)
+        make_response(input, limit, @sentences)
       else
         make_statement(limit)
       end