Class: Attentive::Matcher

Inherits:
Object
  • Object
show all
Defined in:
lib/attentive/matcher.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(phrase, message, params = {}) ⇒ Matcher

Returns a new instance of Matcher.



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# File 'lib/attentive/matcher.rb', line 7

def initialize(phrase, message, params={})
  @phrase = phrase
  @match_start = message.pos
  @cursor = Cursor.new(phrase, params.fetch(:pos, 0))
  @message = message
  self.message.pop while self.message.peek.whitespace?
  @match_params = params.merge(message: message.message, match_start: message.pos)
  @match_data = {}
  @state = :matching

  cursor.pop while cursor.peek.whitespace?
end

Instance Attribute Details

#cursor ⇒ Object (readonly)

Returns the value of attribute cursor.



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# File 'lib/attentive/matcher.rb', line 5

def cursor
  @cursor
end

#message ⇒ Object (readonly)

Returns the value of attribute message.



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# File 'lib/attentive/matcher.rb', line 5

def message
  @message
end

#phrase ⇒ Object (readonly)

Returns the value of attribute phrase.



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# File 'lib/attentive/matcher.rb', line 5

def phrase
  @phrase
end

Instance Method Details

#match! ⇒ Object 



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

def match!
  until (token = message.peek).eof?
    if token.ambiguous?
      unless match_any!(token.possibilities)
        @state = :mismatch
        break
      end
      message.pop
      cursor.pop while cursor.peek.whitespace?

    elsif match_data = cursor.peek.matches?(message)
      @match_data.merge!(match_data) unless match_data == true
      cursor.pop
      cursor.pop while cursor.peek.whitespace?
      @state = :found

      # -> This is the one spot where we instantiate a Match
      return Attentive::Match.new(phrase, @match_params.merge(
        match_end: message.pos,
        match_data: @match_data)) if cursor.eof?

    elsif token.skippable?
      message.pop

    else
      @state = :mismatch
      break
    end

    message.pop while message.peek.whitespace?
  end

  nil
end

#match_any!(messages) ⇒ Object 



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# File 'lib/attentive/matcher.rb', line 67

def match_any!(messages)
  messages.each do |message|
    matcher = Matcher.new(phrase[pos..-1], Cursor.new(message))
    matcher.match!
    unless matcher.mismatch?
      cursor.advance matcher.pos
      return true
    end
  end

  false
end

#matching? ⇒ Boolean

Returns:

  • (Boolean) 


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

def matching?
  @state == :matching
end

#mismatch? ⇒ Boolean

Returns:

  • (Boolean) 


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

def mismatch?
  @state == :mismatch
end

#pos ⇒ Object 



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# File 'lib/attentive/matcher.rb', line 20

def pos
  cursor.pos
end