Class: Trainworks::FileParser

Inherits:

Object

• Object
• Trainworks::FileParser

Defined in:

lib/trainworks/file_parser.rb,
lib/trainworks/file_parser/invalid_railroad_input_format.rb

Overview

FileParser is responsible for parsing the input file

Examples:

AB5, cd99, LetterLetterPositiveNumbers

Defined Under Namespace

Classes: InvalidRailroadInputFormat

Constant Summary

SINGLE_TUPLE_REGEX =

captures, for example, AB99

/(?<from>[a-zA-Z])(?<to>[a-zA-Z])(?<distance>\d+)/

Instance Method Summary

• #initialize(file_path) ⇒ FileParser constructor

  Converts the object into textual markup given a specific format.

• #parse ⇒ Array<Route>

  Array of Routes.

Constructor Details

#initialize(file_path) ⇒ FileParser

Converts the object into textual markup given a specific format.

Parameters:

• file_path (String) —

  the path for input file

# File 'lib/trainworks/file_parser.rb', line 13

def initialize(file_path)
  @raw_content = File.read(file_path)
end

Instance Method Details

#parse ⇒ Array<Route>

Returns array of Routes.

Returns:

• (Array<Route>) —

  array of Routes

Raises:

• (InvalidRailroadInputFormat) —

  if the tuple doesn't match SINGLE_TUPLE_REGEX

# File 'lib/trainworks/file_parser.rb', line 19

def parse
  clean_string(@raw_content).split(',').map do |route_string|
    matched_route_string = route_string.match(SINGLE_TUPLE_REGEX)
    raise InvalidRailroadInputFormat, route_string if matched_route_string.nil?

    Route.new(
      from:     matched_route_string[:from],
      to:       matched_route_string[:to],
      distance: matched_route_string[:distance]
    )
  end
end