Text.XML.HaXml.TypeMapping

HaXml-1.20.2: Utilities for manipulating XML documents

Text.XML.HaXml.TypeMapping

Contents

- A class to get an explicit type representation for any value
- Explicit representation of Haskell datatype information
- Helper functions to extract type info as strings
- Conversion from Haskell datatype to DTD

Synopsis

- class HTypeable a where
  - toHType :: a -> HType
- data HType
  - = Maybe HType
  - | List HType
  - | Tuple [HType]
  - | Prim String String
  - | String
  - | Defined String [HType] [Constr]
- data Constr = Constr String [HType] [HType]
- showHType :: HType -> ShowS
- showConstr :: Int -> HType -> String
- toDTD :: HType -> DocTypeDecl

# A class to get an explicit type representation for any value

class HTypeable a where

`HTypeable` promises that we can create an explicit representation of of the type of any value.

Methods

toHType :: a -> HType

Instances

HTypeable Bool |
HTypeable Char |
HTypeable Double |
HTypeable Float |
HTypeable Int |
HTypeable Integer |
HTypeable () |
HTypeable ANYContent |
HTypeable a => HTypeable [a] |
HTypeable a => HTypeable (Maybe a) |
HTypeable a => HTypeable (List1 a) |
(HTypeable a, HTypeable b) => HTypeable (Either a b) |
(HTypeable a, HTypeable b) => HTypeable (a, b) |
(HTypeable a, HTypeable b) => HTypeable (OneOf2 a b) |
(HTypeable a, HTypeable b, HTypeable c) => HTypeable (a, b, c) |
(HTypeable a, HTypeable b, HTypeable c) => HTypeable (OneOf3 a b c) |
(HTypeable a, HTypeable b, HTypeable c, HTypeable d) => HTypeable (a, b, c, d) |
(HTypeable a, HTypeable b, HTypeable c, HTypeable d) => HTypeable (OneOf4 a b c d) |
(HTypeable a, HTypeable b, HTypeable c, HTypeable d, HTypeable e) => HTypeable (a, b, c, d, e) |
(HTypeable a, HTypeable b, HTypeable c, HTypeable d, HTypeable e) => HTypeable (OneOf5 a b c d e) |
(HTypeable a, HTypeable b, HTypeable c, HTypeable d, HTypeable e, HTypeable f) => HTypeable (a, b, c, d, e, f) |
(HTypeable a, HTypeable b, HTypeable c, HTypeable d, HTypeable e, HTypeable f) => HTypeable (OneOf6 a b c d e f) |
(HTypeable a, HTypeable b, HTypeable c, HTypeable d, HTypeable e, HTypeable f, HTypeable g) => HTypeable (a, b, c, d, e, f, g) |
(HTypeable a, HTypeable b, HTypeable c, HTypeable d, HTypeable e, HTypeable f, HTypeable g) => HTypeable (OneOf7 a b c d e f g) |
(HTypeable a, HTypeable b, HTypeable c, HTypeable d, HTypeable e, HTypeable f, HTypeable g, HTypeable h) => HTypeable (a, b, c, d, e, f, g, h) |
(HTypeable a, HTypeable b, HTypeable c, HTypeable d, HTypeable e, HTypeable f, HTypeable g, HTypeable h) => HTypeable (OneOf8 a b c d e f g h) |
(HTypeable a, HTypeable b, HTypeable c, HTypeable d, HTypeable e, HTypeable f, HTypeable g, HTypeable h, HTypeable i) => HTypeable (a, b, c, d, e, f, g, h, i) |
(HTypeable a, HTypeable b, HTypeable c, HTypeable d, HTypeable e, HTypeable f, HTypeable g, HTypeable h, HTypeable i) => HTypeable (OneOf9 a b c d e f g h i) |
(HTypeable a, HTypeable b, HTypeable c, HTypeable d, HTypeable e, HTypeable f, HTypeable g, HTypeable h, HTypeable i, HTypeable j) => HTypeable (a, b, c, d, e, f, g, h, i, j) |
(HTypeable a, HTypeable b, HTypeable c, HTypeable d, HTypeable e, HTypeable f, HTypeable g, HTypeable h, HTypeable i, HTypeable j) => HTypeable (OneOf10 a b c d e f g h i j) |
(HTypeable a, HTypeable b, HTypeable c, HTypeable d, HTypeable e, HTypeable f, HTypeable g, HTypeable h, HTypeable i, HTypeable j, HTypeable k) => HTypeable (a, b, c, d, e, f, g, h, i, j, k) |
(HTypeable a, HTypeable b, HTypeable c, HTypeable d, HTypeable e, HTypeable f, HTypeable g, HTypeable h, HTypeable i, HTypeable j, HTypeable k) => HTypeable (OneOf11 a b c d e f g h i j k) |
(HTypeable a, HTypeable b, HTypeable c, HTypeable d, HTypeable e, HTypeable f, HTypeable g, HTypeable h, HTypeable i, HTypeable j, HTypeable k, HTypeable l) => HTypeable (a, b, c, d, e, f, g, h, i, j, k, l) |
(HTypeable a, HTypeable b, HTypeable c, HTypeable d, HTypeable e, HTypeable f, HTypeable g, HTypeable h, HTypeable i, HTypeable j, HTypeable k, HTypeable l) => HTypeable (OneOf12 a b c d e f g h i j k l) |
(HTypeable a, HTypeable b, HTypeable c, HTypeable d, HTypeable e, HTypeable f, HTypeable g, HTypeable h, HTypeable i, HTypeable j, HTypeable k, HTypeable l, HTypeable m) => HTypeable (a, b, c, d, e, f, g, h, i, j, k, l, m) |
(HTypeable a, HTypeable b, HTypeable c, HTypeable d, HTypeable e, HTypeable f, HTypeable g, HTypeable h, HTypeable i, HTypeable j, HTypeable k, HTypeable l, HTypeable m) => HTypeable (OneOf13 a b c d e f g h i j k l m) |
(HTypeable a, HTypeable b, HTypeable c, HTypeable d, HTypeable e, HTypeable f, HTypeable g, HTypeable h, HTypeable i, HTypeable j, HTypeable k, HTypeable l, HTypeable m, HTypeable n) => HTypeable (a, b, c, d, e, f, g, h, i, j, k, l, m, n) |
(HTypeable a, HTypeable b, HTypeable c, HTypeable d, HTypeable e, HTypeable f, HTypeable g, HTypeable h, HTypeable i, HTypeable j, HTypeable k, HTypeable l, HTypeable m, HTypeable n) => HTypeable (OneOf14 a b c d e f g h i j k l m n) |
(HTypeable a, HTypeable b, HTypeable c, HTypeable d, HTypeable e, HTypeable f, HTypeable g, HTypeable h, HTypeable i, HTypeable j, HTypeable k, HTypeable l, HTypeable m, HTypeable n, HTypeable o) => HTypeable (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o) |
(HTypeable a, HTypeable b, HTypeable c, HTypeable d, HTypeable e, HTypeable f, HTypeable g, HTypeable h, HTypeable i, HTypeable j, HTypeable k, HTypeable l, HTypeable m, HTypeable n, HTypeable o) => HTypeable (OneOf15 a b c d e f g h i j k l m n o) |
(HTypeable a, HTypeable b, HTypeable c, HTypeable d, HTypeable e, HTypeable f, HTypeable g, HTypeable h, HTypeable i, HTypeable j, HTypeable k, HTypeable l, HTypeable m, HTypeable n, HTypeable o, HTypeable p) => HTypeable (OneOf16 a b c d e f g h i j k l m n o p) |
(HTypeable a, HTypeable b, HTypeable c, HTypeable d, HTypeable e, HTypeable f, HTypeable g, HTypeable h, HTypeable i, HTypeable j, HTypeable k, HTypeable l, HTypeable m, HTypeable n, HTypeable o, HTypeable p, HTypeable q) => HTypeable (OneOf17 a b c d e f g h i j k l m n o p q) |
(HTypeable a, HTypeable b, HTypeable c, HTypeable d, HTypeable e, HTypeable f, HTypeable g, HTypeable h, HTypeable i, HTypeable j, HTypeable k, HTypeable l, HTypeable m, HTypeable n, HTypeable o, HTypeable p, HTypeable q, HTypeable r) => HTypeable (OneOf18 a b c d e f g h i j k l m n o p q r) |
(HTypeable a, HTypeable b, HTypeable c, HTypeable d, HTypeable e, HTypeable f, HTypeable g, HTypeable h, HTypeable i, HTypeable j, HTypeable k, HTypeable l, HTypeable m, HTypeable n, HTypeable o, HTypeable p, HTypeable q, HTypeable r, HTypeable s) => HTypeable (OneOf19 a b c d e f g h i j k l m n o p q r s) |
(HTypeable a, HTypeable b, HTypeable c, HTypeable d, HTypeable e, HTypeable f, HTypeable g, HTypeable h, HTypeable i, HTypeable j, HTypeable k, HTypeable l, HTypeable m, HTypeable n, HTypeable o, HTypeable p, HTypeable q, HTypeable r, HTypeable s, HTypeable t) => HTypeable (OneOf20 a b c d e f g h i j k l m n o p q r s t) |

# Explicit representation of Haskell datatype information

data HType

A concrete representation of any Haskell type.

Constructors

Maybe HType |
List HType |
Tuple [HType] |
Prim String String | separate Haskell name and XML name
String |
Defined String [HType] [Constr] | A user-defined type has a name, a sequence of type variables, and a set of constructors. (The variables might already be instantiated to actual types.)

Instances

Eq HType |
Show HType |

data Constr

A concrete representation of any user-defined Haskell constructor. The constructor has a name, and a sequence of component types. The first sequence of types represents the minimum set of free type variables occurring in the (second) list of real component types. If there are fieldnames, they are contained in the final list, and correspond one-to-one with the component types.

Constructors

Constr String [HType] [HType] |

Instances

Eq Constr |
Show Constr |

# Helper functions to extract type info as strings

showHType :: HType -> ShowS

showConstr :: Int -> HType -> String

Project the n'th constructor from an HType and convert it to a string suitable for an XML tagname.

# Conversion from Haskell datatype to DTD

toDTD :: HType -> DocTypeDecl

`toDTD` converts a concrete representation of the Haskell type of a value (obtained by the method `toHType`) into a real DocTypeDecl. It ensures that PERefs are defined before they are used, and that no element or attribute-list is declared more than once.