Foundation.VFS.FilePath

# Opaque implementation for FilePath

The underlying type of a FilePath is a ByteArray. It is indeed like this because for some systems (Unix systems) a FilePath is a null terminated array of bytes.

# FilePath and FileName for type checking validation

In order to add some constraint at compile time, it is not possible to append (</>) a FilePath to another FilePath. You can only append (</>) a FileName to a given FilePath.

Documentation

data FilePath

FilePath is a collection of FileName

TODO: Eq and Ord are implemented using Show This is not very efficient and would need to be improved Also, it is possible the ordering is not necessary what we want in this case.

A FilePath is one of the following:

• An Absolute:
• starts with one of the follwing "/"
• A relative:
• don't start with a "/"
• authorised:
• "/"
• "filepath"
• "."
• ".."
• "workhaskellhs-foundation"
• unauthorised
• "path//"

Instances

Eq FilePath

Methods

(==) :: FilePath -> FilePath -> Bool

(/=) :: FilePath -> FilePath -> Bool

Ord FilePath

Methods

compare :: FilePath -> FilePath -> Ordering

(<) :: FilePath -> FilePath -> Bool

(<=) :: FilePath -> FilePath -> Bool

(>) :: FilePath -> FilePath -> Bool

(>=) :: FilePath -> FilePath -> Bool

max :: FilePath -> FilePath -> FilePath

min :: FilePath -> FilePath -> FilePath

Show FilePath

Methods

showsPrec :: Int -> FilePath -> ShowS

show :: FilePath -> String

showList :: [FilePath] -> ShowS

IsString FilePath

Methods

fromString :: String -> FilePath

Path FilePath

Associated Types

type PathEnt FilePath :: *

type PathPrefix FilePath :: *

type PathSuffix FilePath :: *

Methods

(</>) :: FilePath -> PathEnt FilePath -> FilePath

splitPath :: FilePath -> (PathPrefix FilePath, [PathEnt FilePath], PathSuffix FilePath)

buildPath :: (PathPrefix FilePath, [PathEnt FilePath], PathSuffix FilePath) -> FilePath

type PathEnt FilePath

type PathEnt FilePath = FileName

type PathPrefix FilePath

type PathPrefix FilePath = Relativity

type PathSuffix FilePath

type PathSuffix FilePath = ()

data Relativity

information about type of FilePath

A file path being only Relative or Absolute.

Constructors

Absolute

Relative

Instances

Eq Relativity

Methods

(==) :: Relativity -> Relativity -> Bool

(/=) :: Relativity -> Relativity -> Bool

Show Relativity

Methods

showsPrec :: Int -> Relativity -> ShowS

show :: Relativity -> String

showList :: [Relativity] -> ShowS

data FileName

A filename (or path entity) in the FilePath

• Authorised
• ""
• "."
• ".."
• "foundation"
• Unauthorised
• "/"
• "file/"
• "/file"
• "file/path"

Instances

Eq FileName

Methods

(==) :: FileName -> FileName -> Bool

(/=) :: FileName -> FileName -> Bool

Show FileName

Methods

showsPrec :: Int -> FileName -> ShowS

show :: FileName -> String

showList :: [FileName] -> ShowS

IsString FileName

Methods

fromString :: String -> FileName

Monoid FileName

Methods

mempty :: FileName

mappend :: FileName -> FileName -> FileName

mconcat :: [FileName] -> FileName

conversion

filePathToString :: FilePath -> String

filePathToLString :: FilePath -> [Char]

conversion of a FilePath into a list of Char

this function may throw exceptions

unsafe

unsafeFilePath :: Relativity -> [FileName] -> FilePath

build a file path from a given list of filename

this is unsafe and is mainly needed for testing purpose

unsafeFileName :: UArray Word8 -> FileName

build a file name from a given ByteArray

this is unsafe and is mainly needed for testing purpose

extension :: FileName -> Maybe FileName