diff options
Diffstat (limited to 'examples')
| -rw-r--r-- | examples/Foo.hs | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/examples/Foo.hs b/examples/Foo.hs new file mode 100644 index 00000000..a4753aa9 --- /dev/null +++ b/examples/Foo.hs @@ -0,0 +1,143 @@ +----------------------------------------------------------------------------- +-- | +-- Module : Foo +-- Copyright : (c) Simon Marlow 2002 +-- License : BSD-style +-- +-- Maintainer : libraries@haskell.org +-- Stability : provisional +-- Portability : portable +-- +-- This is the module comment for the "Foo" module +-- +----------------------------------------------------------------------------- + +-- This is plain comment, ignored by Haddock. + +module Foo ( + + -- Section headings are introduced with '-- *': + -- * Type declarations + + -- Subsection headings are introduced with '-- **' and so on. + -- ** Data types + T(..), T2, T3(..), T4(..), + N1(..), N2(..), N3(..), N4, + + -- ** Records + R(..), + + -- * Class declarations + C(a,b), D(..), E, F(..), + + -- * Function types + f, g, + + -- * Auxiliary stuff + -- $aux + ) where + + +-- | This comment applies to the /following/ declaration +-- and it continues until the next non-comment line +data T a b + = A Int (Maybe Float) -- ^ This comment describes the 'A' constructor + | -- | This comment describes the 'B' constructor + B (T a b, T Int Float) -- ^ + +-- | An abstract data declaration +data T2 a b = T2 a b + +-- | A data declaration with no documentation annotations on the constructors +data T3 a b = A1 a | B1 b + +-- A data declaration with no documentation annotations at all +data T4 a b = A2 a | B2 b + +-- | A newtype +newtype N1 a b = N1 (a b) + +-- | A newtype with a fieldname +newtype N2 a b = N2 {n :: a b} + +-- | A newtype with a fieldname, documentation on the field +newtype N3 a b = N3 {n3 :: a b -- ^ this is the 'n3' field + } + +-- | An abstract newtype - we show this one as data rather than newtype because +-- the difference isn\'t visible to the programmer for an abstract type. +newtype N4 a b = N4 a + +class (D a) => C a where + -- |this is a description of the 'a' method + a :: Int + b :: Float + -- ^ this is a description of the 'b' method + c :: Double -- c is hidden in the export list + +-- ^ This comment applies to the /previous/ declaration (the 'C' class) + +class D a where + d :: T a b + e :: (a,a) +-- ^ This is a class declaration with no separate docs for the methods + +class E a where + ee :: Int +-- ^ This is a class declaration with no methods (or no methods exported) + +-- This is a class declaration with no documentation at all +class F a where + ff :: Float + +-- | This is the documentation for the 'R' record, which has four fields, +-- 'p', 'q', 'r', and 's'. +data R = + C1 { p :: Int -- ^ This comment applies to the 'p' field + , q :: forall a . a->a -- ^ This comment applies to the 'q' field + , -- | This comment applies to both 'r' and 's' + r,s :: Int + } + +-- These section headers are only used when there is no export list to +-- give the structure of the documentation: + +-- * This is a section header (level 1) +-- ** This is a section header (level 2) +-- *** This is a section header (level 3) + +-- | In a comment string we can refer to identifiers in scope with +-- single quotes like this: 'T', and we can refer to modules by +-- using double quotes: "Foo". We can add emphasis /like this/. +-- +-- * This is a bulleted list +-- +-- - This is the next item (different kind of bullet) +-- +-- (1) This is an ordered list +-- +-- 2. This is the next item (different kind of bullet) +-- +-- [ +-- This is a block of code, which can include other markup: 'R' +-- formatting +-- is +-- significant +-- ] +-- +-- We can also include URLs in documentation: <http://www.haskell.org/>. + +f :: C a => Int -> Int + + +-- | we can export foreign declarations too +foreign import ccall g :: Int -> IO CInt + +-- | this doc string has a parse error in it: ' +h :: Int +h = 42 + + +-- $aux This is some documentation that is attached to a name ($aux) +-- rather than a source declaration. The documentation may be +-- referred to in the export list using its name. |