Class: Stockade::Lexer

Inherits:
Object
  • Object
show all
Extended by:
Memoist
Defined in:
lib/stockade.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(datum) ⇒ Lexer

Returns a new instance of Lexer.



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# File 'lib/stockade.rb', line 13

def initialize(datum)
  @datum = datum.strip.dup
end

Instance Attribute Details

#datum ⇒ Object (readonly)

Returns the value of attribute datum.



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# File 'lib/stockade.rb', line 11

def datum
  @datum
end

Class Method Details

.call(datum) ⇒ Object 



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# File 'lib/stockade.rb', line 17

def self.call(datum)
  new(datum).call
end

Instance Method Details

#call ⇒ Object 



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# File 'lib/stockade.rb', line 36

def call
  res = []

  patterns.each do |name, regex|
    scanner = StringScanner.new(datum)

    loop do
      break unless scanner.scan_until(regex)
      value = scanner.matched

      lexeme = name
      if lexeme == :name
        lexeme = :surname if surname?(value)
        lexeme = :firstname if firstname?(value)
      end
      next if lexeme == :name

      res << {
        lexeme: lexeme,
        value: scanner.matched
      }

      @datum = @datum[0..scanner.pos-scanner.matched.size] +
        '*' * scanner.matched.size +
        @datum[scanner.pos..-1]
    end
  end

  res
end

#name_regex ⇒ Object 



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# File 'lib/stockade.rb', line 67

def name_regex
  /\w+/
end

#patterns ⇒ Object

order is important - from most specific to least the first one that matches stops the scan



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# File 'lib/stockade.rb', line 23

def patterns
  {
    email: email_regex,
    phone: phone_regex,
    name: name_regex,
  }
end

#scanner ⇒ Object 



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# File 'lib/stockade.rb', line 31

def scanner
  StringScanner.new(datum)
end

#word_regex ⇒ Object 



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# File 'lib/stockade.rb', line 71

def word_regex
  /\W+/
end