Safe Haskell	Safe-Inferred

Lab3Help

Synopsis

Documentation

Description of a bus stop.

Constructors

BStop
Fields name :: String The bus stop's name. position :: (Integer, Integer) Coordinates (x, y). Invariant: The coordinates range from 0 to 1000.

Instances

Description of a bus line.

Constructors

BLineTable
Fields lineNumber :: Integer The line number. stops :: [BLineStop] Bus stops (in the order in which they are visited). Invariant: The list contains at least one element.

Instances

Description of a bus stop, as part of a bus line.

Constructors

BLineStop
Fields stopName :: String The bus stop's name. time :: Integer The travel time (in minutes) from the previous bus stop. Invariant: A non-negative number, 0 if this is the first stop.

Instances

readStops :: FilePath -> IO (Either String [BStop])

Tries to read a list of bus stops from the given file. If an error is encountered, then an error message is returned (Left msg).

readLines :: FilePath -> IO (Either String [BLineTable])

Tries to read information about bus lines from the given file. If an error is encountered, then an error message is returned (Left msg).