Class: Attentive::Tokenizer

Inherits:
Object
  • Object
show all
Includes:
Tokens
Defined in:
lib/attentive/tokenizer.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Tokens

#any_of, #emoji, #entity, #invocation, #punctuation, #regexp, #whitespace, #word

Constructor Details

#initialize(message, options = {}) ⇒ Tokenizer

Returns a new instance of Tokenizer.



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# File 'lib/attentive/tokenizer.rb', line 18

def initialize(message, options={})
  @message = message.downcase
  @chars = self.message.each_char.to_a
  @options = options
end

Instance Attribute Details

#chars ⇒ Object (readonly)

Returns the value of attribute chars.



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# File 'lib/attentive/tokenizer.rb', line 10

def chars
  @chars
end

#message ⇒ Object (readonly)

Returns the value of attribute message.



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# File 'lib/attentive/tokenizer.rb', line 10

def message
  @message
end

#options ⇒ Object (readonly)

Returns the value of attribute options.



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# File 'lib/attentive/tokenizer.rb', line 10

def options
  @options
end

Class Method Details

.tokenize(message, options = {}) ⇒ Object 



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# File 'lib/attentive/tokenizer.rb', line 12

def self.tokenize(message, options={})
  self.new(message, options).tokenize
end

Instance Method Details

#fail_if_ambiguous? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/attentive/tokenizer.rb', line 36

def fail_if_ambiguous?
  !options.fetch(:ambiguous, true)
end

#match_entities? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/attentive/tokenizer.rb', line 24

def match_entities?
  options.fetch(:entities, false)
end

#match_regexps? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/attentive/tokenizer.rb', line 28

def match_regexps?
  options.fetch(:regexps, false)
end

#perform_substitutions? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/attentive/tokenizer.rb', line 32

def perform_substitutions?
  options.fetch(:substitutions, true)
end

#tokenize ⇒ Object 



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# File 'lib/attentive/tokenizer.rb', line 42

def tokenize
  i = 0
  @tokens = []
  @leaves = []

  while i < chars.length
    char = chars[i]
    char = CHARACTER_SUBSTITIONS.fetch(char, char)
    pos = tokens.any? ? tokens.last.end : 0

    if WHITESPACE === char && string = match_whitespace_at(i)
      add_token whitespace(string, pos: pos)
      i += string.length

    elsif ENTITY_START === char && string = match_entity_at(i)
      add_token entity(string, pos: pos)
      i += string.length + 4

    elsif NUMBER_START === char && string = match_number_at(i)
      add_token word(string, pos: pos)
      i += string.length

    elsif EMOJI_START === char && string = match_emoji_at(i)
      add_token emoji(string, pos: pos)
      i += string.length + 2

    elsif REGEXP_START === char && string = match_regexp_at(i)
      add_token regexp(string, pos: pos)
      i += string.length

    elsif PUNCTUATION === char
      add_token punctuation(char, pos: pos)
      i += 1

    else string = match_word_at(i)
      add_token word(string, pos: pos)
      i += string.length

    end
  end

  fail_if_ambiguous!(message, tokens) if fail_if_ambiguous?

  Attentive::Phrase.new(tokens)
end