Class: Autosuggest::Generator

Inherits:
Object
  • Object
show all
Defined in:
lib/autosuggest/generator.rb

Instance Method Summary collapse

Constructor Details

#initialize(top_queries, language: "english") ⇒ Generator

Returns a new instance of Generator.



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# File 'lib/autosuggest/generator.rb', line 3

def initialize(top_queries, language: "english")
  @top_queries = top_queries
  @concepts = {}
  @words = Set.new
  @non_duplicates = Set.new
  @blocked_words = {}
  @preferred_queries = {}
  @profane_words = {}
  @concept_tree = {}
  begin
    @stemmer = Mittens::Stemmer.new(language: language)
  rescue ArgumentError
    raise ArgumentError, "Language not available"
  end
  # TODO take language into account for profanity
  add_nodes(@profane_words, Obscenity::Base.blacklist)
end

Instance Method Details

#add_concept(name, values) ⇒ Object 



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# File 'lib/autosuggest/generator.rb', line 21

def add_concept(name, values)
  values = values.compact.uniq
  add_nodes(@concept_tree, values)
  @concepts[name] = Set.new(values.map(&:downcase))
end

#block_words(words) ⇒ Object 



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# File 'lib/autosuggest/generator.rb', line 49

def block_words(words)
  add_nodes(@blocked_words, words)
  words
end

#not_duplicates(pairs) ⇒ Object 



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# File 'lib/autosuggest/generator.rb', line 43

def not_duplicates(pairs)
  pairs.each do |pair|
    @non_duplicates << pair.map(&:downcase).sort
  end
end

#parse_words(phrases, min: 1) ⇒ Object 



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# File 'lib/autosuggest/generator.rb', line 27

def parse_words(phrases, min: 1)
  word_counts = Hash.new(0)
  phrases.each do |phrase|
    words = tokenize(phrase)
    words.each do |word|
      word_counts[word] += 1
    end
  end

  word_counts.select { |_, c| c >= min }.each do |word, _|
    @words << word
  end

  word_counts
end

#prefer(queries) ⇒ Object 



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# File 'lib/autosuggest/generator.rb', line 54

def prefer(queries)
  queries.each do |query|
    @preferred_queries[normalize_query(query)] ||= query
  end
end

#suggestions(filter: true) ⇒ Object 



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# File 'lib/autosuggest/generator.rb', line 60

def suggestions(filter: true)
  stemmed_queries = {}
  added_queries = Set.new
  results = @top_queries.sort_by { |_query, count| -count }.map do |query, count|
    query = query.to_s

    # TODO do not ignore silently
    next if query.length < 2

    stemmed_query = normalize_query(query)

    # get preferred term
    preferred_query = @preferred_queries[stemmed_query]
    if preferred_query && preferred_query != query
      original_query, query = query, preferred_query
    end

    # exclude duplicates
    duplicate = stemmed_queries[stemmed_query]
    stemmed_queries[stemmed_query] ||= query

    # also detect possibly misspelled duplicates
    # TODO use top query as duplicate
    if !duplicate && query.length > 4
      edits(query).each do |edited_query|
        if added_queries.include?(edited_query)
          duplicate = edited_query
          break
        end
      end
    end
    if duplicate && @non_duplicates.include?([duplicate, query].sort)
      duplicate = nil
    end
    added_queries << query unless duplicate

    # find concepts
    concepts = []
    @concepts.each do |name, values|
      concepts << name if values.include?(query)
    end

    tokens = tokenize(query)

    # exclude misspellings that are not brands
    misspelling = @words.any? && misspellings?(tokens)

    profane = blocked?(tokens, @profane_words)
    blocked = blocked?(tokens, @blocked_words)

    notes = []
    notes << "duplicate of #{duplicate}" if duplicate
    notes.concat(concepts)
    notes << "misspelling" if misspelling
    notes << "profane" if profane
    notes << "blocked" if blocked
    notes << "originally #{original_query}" if original_query

    {
      query: query,
      original_query: original_query,
      score: count,
      duplicate: duplicate,
      concepts: concepts,
      misspelling: misspelling,
      profane: profane,
      blocked: blocked,
      notes: notes
    }
  end

  results.compact!

  if filter
    results.filter_map do |s|
      unless s[:duplicate] || s[:misspelling] || s[:profane] || s[:blocked]
        s.slice(:query, :score)
      end
    end
  else
    results
  end
end

#table ⇒ Object Also known as: pretty_suggestions 



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# File 'lib/autosuggest/generator.rb', line 144

def table
  str = "%-30s   %5s   %s\n" % %w(Query Score Notes)
  suggestions(filter: false).each do |suggestion|
    str << "%-30s   %5d   %s\n" % [suggestion[:query], suggestion[:score], suggestion[:notes].join(", ")]
  end
  str
end