Class: Chronic::Handler

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(pattern, handler_method) ⇒ Handler

pattern - An Array of patterns to match tokens against. handler_method - A Symbol representing the method to be invoked

when a pattern matches.



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# File 'lib/chronic/handler.rb', line 11

def initialize(pattern, handler_method)
  @pattern = pattern
  @handler_method = handler_method
end

Instance Attribute Details

#handler_method ⇒ Object (readonly)

Returns the value of attribute handler_method.



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# File 'lib/chronic/handler.rb', line 6

def handler_method
  @handler_method
end

#pattern ⇒ Object (readonly)

Returns the value of attribute pattern.



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# File 'lib/chronic/handler.rb', line 4

def pattern
  @pattern
end

Instance Method Details

#==(other) ⇒ Object

other - The other Handler object to compare.

Returns true if these Handlers match.



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# File 'lib/chronic/handler.rb', line 82

def ==(other)
  @pattern == other.pattern
end

#invoke(type, tokens, parser, options) ⇒ Object 



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# File 'lib/chronic/handler.rb', line 70

def invoke(type, tokens, parser, options)
  if Chronic.debug
    puts "-#{type}"
    puts "Handler: #{@handler_method}"
  end

  parser.send(@handler_method, tokens, options)
end

#match(tokens, definitions) ⇒ Object

tokens - An Array of tokens to process. definitions - A Hash of definitions to check against.

Returns true if a match is found.



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# File 'lib/chronic/handler.rb', line 20

def match(tokens, definitions)
  token_index = 0
  @pattern.each do |elements|
    was_optional = false
    elements = [elements] unless elements.is_a?(Array)

    elements.each_index do |i|
      name = elements[i].to_s
      optional = name[-1, 1] == '?'
      name = name.chop if optional

      case elements[i]
      when Symbol
        if tags_match?(name, tokens, token_index)
          token_index += 1
          break
        else
          if optional
            was_optional = true
            next
          elsif i + 1 < elements.count
            next
          else
            return false unless was_optional
          end
        end

      when String
        return true if optional && token_index == tokens.size

        if definitions.key?(name.to_sym)
          sub_handlers = definitions[name.to_sym]
        else
          raise "Invalid subset #{name} specified"
        end

        sub_handlers.each do |sub_handler|
          return true if sub_handler.match(tokens[token_index..tokens.size], definitions)
        end
      else
        raise "Invalid match type: #{elements[i].class}"
      end
    end

  end

  return false if token_index != tokens.size
  return true
end