Class: Herbalist::Tag

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

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(type, value) ⇒ Tag

Returns a new instance of Tag.



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# File 'lib/herbalist/herbalist.rb', line 104

def initialize(type, value)
  @type = type
	@value = value
end

Instance Attribute Details

#type ⇒ Object

Returns the value of attribute type.



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# File 'lib/herbalist/herbalist.rb', line 102

def type
  @type
end

#value ⇒ Object

Returns the value of attribute value.



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# File 'lib/herbalist/herbalist.rb', line 102

def value
  @value
end

Class Method Details

.scan(tokens) ⇒ Object

scan the given tokens and tag any matches



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# File 'lib/herbalist/herbalist.rb', line 110

def self.scan(tokens)
 tokens.each do |token|
   if t = self.scan_for_numbers(token) then token.tag(t) end
   if t = self.scan_for_units(token) then token.tag(t) end
  end
 tokens
end

.scan_for_numbers(token) ⇒ Object

check the token to see if if it is a number then tag it



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# File 'lib/herbalist/herbalist.rb', line 120

def self.scan_for_numbers(token)
 if token.word =~ /(^|\W)(\d*\.\d+)($|\W)/ || token.word =~ /(^|\W)(\d+)($|\W)/
   return Tag.new(:number, $2.to_f)
  end
  return nil
end

.scan_for_units(token) ⇒ Object

check the token and see if it is a type of unit that Alchemist can handle then tag the token with that unit type



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# File 'lib/herbalist/herbalist.rb', line 129

def self.scan_for_units(token)
  return nil if token.get_tag(:number)
  # all units
  POSSIBLE_UNITS.each do |unit| 
    if token.word.length<=2 # special matching for short forms ex. Mi
      return Tag.new(:unit, unit) if token.word == unit.to_s
    elsif token.word =~ /(^|\W)#{unit.to_s}($|\W)/i
      return Tag.new(:unit, unit)
    end
  end
  
  # try si units with prefixes (kilo, deca etc)
  Alchemist.library.unit_prefixes.each do |prefix, value|
    if token.word =~ /^#{prefix.to_s}.+/i
      Alchemist.library.si_units.each do |unit|
        if unit.to_s=~/#{token.word.gsub(/^#{prefix.to_s}/i,'')}$/i
          return Tag.new(:unit, "#{prefix}#{unit}") 
        end
      end
    end
  end

  return nil
end

Instance Method Details

#to_s ⇒ Object 



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# File 'lib/herbalist/herbalist.rb', line 154

def to_s
  "#{type}-#{value}"
end