lucid-2.9.11: Clear to write, read and edit DSL for HTML

Safe HaskellNone
LanguageHaskell98

Lucid.Base

Contents

Description

Base types and combinators.

Synopsis

Rendering

renderText :: Html a -> Text #

Render the HTML to a lazy Text.

This is a convenience function defined in terms of execHtmlT, runIdentity and toLazyByteString, and decodeUtf8. Check the source if you're interested in the lower-level behaviour.

renderBS :: Html a -> ByteString #

Render the HTML to a lazy ByteString.

This is a convenience function defined in terms of execHtmlT, runIdentity and toLazyByteString. Check the source if you're interested in the lower-level behaviour.

renderTextT :: Monad m => HtmlT m a -> m Text #

Render the HTML to a lazy Text, but in a monad.

This is a convenience function defined in terms of execHtmlT and toLazyByteString, and decodeUtf8. Check the source if you're interested in the lower-level behaviour.

renderBST :: Monad m => HtmlT m a -> m ByteString #

Render the HTML to a lazy ByteString, but in a monad.

This is a convenience function defined in terms of execHtmlT and toLazyByteString. Check the source if you're interested in the lower-level behaviour.

renderToFile :: FilePath -> Html a -> IO () #

Render the HTML to a lazy ByteString.

This is a convenience function defined in terms of execHtmlT, runIdentity and toLazyByteString. Check the source if you're interested in the lower-level behaviour.

Running

execHtmlT #

Arguments

:: Monad m 
=> HtmlT m a

The HTML to generate.

-> m Builder

The a is discarded.

Build the HTML. Analogous to execState.

You might want to use this is if you want to do something with the raw Builder. Otherwise for simple cases you can just use renderText or renderBS.

evalHtmlT #

Arguments

:: Monad m 
=> HtmlT m a

HTML monad to evaluate.

-> m a

Ignore the HTML output and just return the value.

Evaluate the HTML to its return value. Analogous to evalState.

Use this if you want to ignore the HTML output of an action completely and just get the result.

For using with the Html type, you'll need runIdentity e.g.

>>> runIdentity (evalHtmlT (p_ "Hello!"))
()

runHtmlT :: HtmlT m a -> m (HashMap Text Text -> Builder, a) #

This is the low-level way to run the HTML transformer, finally returning an element builder and a value. You can pass mempty for this argument for a top-level call. See evalHtmlT and execHtmlT for easier to use functions.

relaxHtmlT #

Arguments

:: Monad m 
=> HtmlT Identity a

The HTML generated purely.

-> HtmlT m a

Same HTML accessible in a polymorphic context.

Generalize the underlying monad.

Some builders are happy to deliver results in a pure underlying monad, here Identity, but have trouble maintaining the polymorphic type. This utility generalizes from Identity.

Since: 2.9.6

commuteHtmlT #

Arguments

:: (Functor m, Monad n) 
=> HtmlT m a

unpurely generated HTML

-> m (HtmlT n a)

Commuted monads. Note: n can be Identity

Commute inner m to the front.

This is useful when you have impure HTML generation, e.g. using StateT. Recall, there is `MonadState s HtmlT` instance.

exampleHtml :: MonadState Int m => HtmlT m ()
exampleHtml = ul_ $ replicateM_ 5 $ do
  x <- get
  put (x + 1)
  li_ $ toHtml $ show x

exampleHtml' :: Monad m => HtmlT m ()
exampleHtml' = evalState (commuteHtmlT exampleHtml) 1

Since: 2.9.9

Combinators

makeElement #

Arguments

:: Functor m 
=> Text

Name.

-> HtmlT m a

Children HTML.

-> HtmlT m a

A parent element.

Make an HTML builder.

makeElementNoEnd #

Arguments

:: Applicative m 
=> Text

Name.

-> HtmlT m ()

A parent element.

Make an HTML builder for elements which have no ending tag.

makeXmlElementNoEnd #

Arguments

:: Applicative m 
=> Text

Name.

-> HtmlT m ()

A parent element.

Make an XML builder for elements which have no ending tag.

makeAttribute #

Arguments

:: Text

Attribute name.

-> Text

Attribute value.

-> Attribute 

Make an attribute builder.

Types

type Html = HtmlT Identity #

Simple HTML builder type. Defined in terms of HtmlT. Check out that type for instance information.

Simple use-cases will just use this type. But if you want to transformer over Reader or something, you can go and use HtmlT.

newtype HtmlT m a #

A monad transformer that generates HTML. Use the simpler Html type if you don't want to transform over some other monad.

Constructors

HtmlT (m (HashMap Text Text -> Builder, a)) 
Instances
MonadTrans HtmlT #

Used for lift.

Instance details

Defined in Lucid.Base

Methods

lift :: Monad m => m a -> HtmlT m a #

MonadWriter w m => MonadWriter w (HtmlT m) #

Since: 2.9.9

Instance details

Defined in Lucid.Base

Methods

writer :: (a, w) -> HtmlT m a #

tell :: w -> HtmlT m () #

listen :: HtmlT m a -> HtmlT m (a, w) #

pass :: HtmlT m (a, w -> w) -> HtmlT m a #

MonadState s m => MonadState s (HtmlT m) #

Since: 2.9.7

Instance details

Defined in Lucid.Base

Methods

get :: HtmlT m s #

put :: s -> HtmlT m () #

state :: (s -> (a, s)) -> HtmlT m a #

MonadReader r m => MonadReader r (HtmlT m) #

Since: 2.9.7

Instance details

Defined in Lucid.Base

Methods

ask :: HtmlT m r #

local :: (r -> r) -> HtmlT m a -> HtmlT m a #

reader :: (r -> a) -> HtmlT m a #

MonadError e m => MonadError e (HtmlT m) #

Since: 2.9.9

Instance details

Defined in Lucid.Base

Methods

throwError :: e -> HtmlT m a #

catchError :: HtmlT m a -> (e -> HtmlT m a) -> HtmlT m a #

(Monad m, a ~ ()) => TermRaw Text (HtmlT m a) #

Given children immediately, just use that and expect no attributes.

Instance details

Defined in Lucid.Base

Methods

termRaw :: Text -> Text -> HtmlT m a #

termRawWith :: Text -> [Attribute] -> Text -> HtmlT m a #

Monad m => Monad (HtmlT m) #

Basically acts like Writer.

Instance details

Defined in Lucid.Base

Methods

(>>=) :: HtmlT m a -> (a -> HtmlT m b) -> HtmlT m b #

(>>) :: HtmlT m a -> HtmlT m b -> HtmlT m b #

return :: a -> HtmlT m a #

fail :: String -> HtmlT m a #

Functor m => Functor (HtmlT m) #

Just re-uses Monad.

Instance details

Defined in Lucid.Base

Methods

fmap :: (a -> b) -> HtmlT m a -> HtmlT m b #

(<$) :: a -> HtmlT m b -> HtmlT m a #

Applicative m => Applicative (HtmlT m) #

Based on the monad instance.

Instance details

Defined in Lucid.Base

Methods

pure :: a -> HtmlT m a #

(<*>) :: HtmlT m (a -> b) -> HtmlT m a -> HtmlT m b #

liftA2 :: (a -> b -> c) -> HtmlT m a -> HtmlT m b -> HtmlT m c #

(*>) :: HtmlT m a -> HtmlT m b -> HtmlT m b #

(<*) :: HtmlT m a -> HtmlT m b -> HtmlT m a #

MonadIO m => MonadIO (HtmlT m) #

If you want to use IO in your HTML generation.

Instance details

Defined in Lucid.Base

Methods

liftIO :: IO a -> HtmlT m a #

MFunctor HtmlT #

Since: 2.9.5

Instance details

Defined in Lucid.Base

Methods

hoist :: Monad m => (forall a. m a -> n a) -> HtmlT m b -> HtmlT n b #

(Monad m, ToHtml f, a ~ ()) => TermRaw [Attribute] (f -> HtmlT m a) #

Given attributes, expect more child input.

Instance details

Defined in Lucid.Base

Methods

termRaw :: Text -> [Attribute] -> f -> HtmlT m a #

termRawWith :: Text -> [Attribute] -> [Attribute] -> f -> HtmlT m a #

(Applicative m, f ~ HtmlT m a) => Term [Attribute] (f -> HtmlT m a) #

Given attributes, expect more child input.

Instance details

Defined in Lucid.Base

Methods

term :: Text -> [Attribute] -> f -> HtmlT m a #

termWith :: Text -> [Attribute] -> [Attribute] -> f -> HtmlT m a #

m ~ Identity => Show (HtmlT m a) #

Just calls renderText.

Instance details

Defined in Lucid.Base

Methods

showsPrec :: Int -> HtmlT m a -> ShowS #

show :: HtmlT m a -> String #

showList :: [HtmlT m a] -> ShowS #

(Monad m, a ~ ()) => IsString (HtmlT m a) #

We pack it via string. Could possibly encode straight into a builder. That might be faster.

Instance details

Defined in Lucid.Base

Methods

fromString :: String -> HtmlT m a #

(a ~ (), Applicative m) => Semigroup (HtmlT m a) #

Since: 2.9.7

Instance details

Defined in Lucid.Base

Methods

(<>) :: HtmlT m a -> HtmlT m a -> HtmlT m a #

sconcat :: NonEmpty (HtmlT m a) -> HtmlT m a #

stimes :: Integral b => b -> HtmlT m a -> HtmlT m a #

(a ~ (), Applicative m) => Monoid (HtmlT m a) #

Monoid is right-associative, a la the Builder in it.

Instance details

Defined in Lucid.Base

Methods

mempty :: HtmlT m a #

mappend :: HtmlT m a -> HtmlT m a -> HtmlT m a #

mconcat :: [HtmlT m a] -> HtmlT m a #

Functor m => With (HtmlT m a -> HtmlT m a) #

For the contentful elements: div_

Instance details

Defined in Lucid.Base

Methods

with :: (HtmlT m a -> HtmlT m a) -> [Attribute] -> HtmlT m a -> HtmlT m a #

Functor m => With (HtmlT m a) #

For the contentless elements: br_

Instance details

Defined in Lucid.Base

Methods

with :: HtmlT m a -> [Attribute] -> HtmlT m a #

(a ~ (), m ~ Identity) => ToHtml (HtmlT m a) #

Since: 2.9.8

Instance details

Defined in Lucid.Base

Methods

toHtml :: Monad m0 => HtmlT m a -> HtmlT m0 () #

toHtmlRaw :: Monad m0 => HtmlT m a -> HtmlT m0 () #

Applicative m => Term (HtmlT m a) (HtmlT m a) #

Given children immediately, just use that and expect no attributes.

Instance details

Defined in Lucid.Base

Methods

term :: Text -> HtmlT m a -> HtmlT m a #

termWith :: Text -> [Attribute] -> HtmlT m a -> HtmlT m a #

data Attribute #

A simple attribute. Don't use the constructor, use makeAttribute.

Constructors

Attribute !Text !Text 
Instances
Eq Attribute # 
Instance details

Defined in Lucid.Base

Show Attribute # 
Instance details

Defined in Lucid.Base

Hashable Attribute # 
Instance details

Defined in Lucid.Base

TermRaw Text Attribute #

Some termRaws (like style_, title_) can be used for attributes as well as elements.

Instance details

Defined in Lucid.Base

Term Text Attribute #

Some terms (like style_, title_) can be used for attributes as well as elements.

Instance details

Defined in Lucid.Base

Methods

term :: Text -> Text -> Attribute #

termWith :: Text -> [Attribute] -> Text -> Attribute #

(Monad m, ToHtml f, a ~ ()) => TermRaw [Attribute] (f -> HtmlT m a) #

Given attributes, expect more child input.

Instance details

Defined in Lucid.Base

Methods

termRaw :: Text -> [Attribute] -> f -> HtmlT m a #

termRawWith :: Text -> [Attribute] -> [Attribute] -> f -> HtmlT m a #

(Applicative m, f ~ HtmlT m a) => Term [Attribute] (f -> HtmlT m a) #

Given attributes, expect more child input.

Instance details

Defined in Lucid.Base

Methods

term :: Text -> [Attribute] -> f -> HtmlT m a #

termWith :: Text -> [Attribute] -> [Attribute] -> f -> HtmlT m a #

Classes

class Term arg result | result -> arg where #

Used to construct HTML terms.

Simplest use: p_ = term "p" yields p_.

Very overloaded for three cases:

  • The first case is the basic arg of [(Text,Text)] which will return a function that wants children.
  • The second is an arg which is HtmlT m (), in which case the term accepts no attributes and just the children are used for the element.
  • Finally, this is also used for overloaded attributes, like style_ or title_. If a return type of (Text,Text) is inferred then an attribute will be made.

The instances look intimidating but actually the constraints make it very general so that type inference works well even in the presence of things like OverloadedLists and such.

Minimal complete definition

termWith

Methods

term #

Arguments

:: Text

Name of the element or attribute.

-> arg

Either an attribute list or children.

-> result

Result: either an element or an attribute.

Used for constructing elements e.g. term "p" yields p_.

termWith #

Arguments

:: Text

Name.

-> [Attribute]

Attribute transformer.

-> arg

Some argument.

-> result

Result: either an element or an attribute.

Use this if you want to make an element which inserts some pre-prepared attributes into the element.

Instances
Term Text Attribute #

Some terms (like style_, title_) can be used for attributes as well as elements.

Instance details

Defined in Lucid.Base

Methods

term :: Text -> Text -> Attribute #

termWith :: Text -> [Attribute] -> Text -> Attribute #

(Applicative m, f ~ HtmlT m a) => Term [Attribute] (f -> HtmlT m a) #

Given attributes, expect more child input.

Instance details

Defined in Lucid.Base

Methods

term :: Text -> [Attribute] -> f -> HtmlT m a #

termWith :: Text -> [Attribute] -> [Attribute] -> f -> HtmlT m a #

Applicative m => Term (HtmlT m a) (HtmlT m a) #

Given children immediately, just use that and expect no attributes.

Instance details

Defined in Lucid.Base

Methods

term :: Text -> HtmlT m a -> HtmlT m a #

termWith :: Text -> [Attribute] -> HtmlT m a -> HtmlT m a #

class TermRaw arg result | result -> arg where #

Same as the Term class, but will not HTML escape its children. Useful for elements like style_ or script_.

Minimal complete definition

termRawWith

Methods

termRaw #

Arguments

:: Text

Name of the element or attribute.

-> arg

Either an attribute list or children.

-> result

Result: either an element or an attribute.

Used for constructing elements e.g. termRaw "p" yields p_.

termRawWith #

Arguments

:: Text

Name.

-> [Attribute]

Attribute transformer.

-> arg

Some argument.

-> result

Result: either an element or an attribute.

Use this if you want to make an element which inserts some pre-prepared attributes into the element.

Instances
TermRaw Text Attribute #

Some termRaws (like style_, title_) can be used for attributes as well as elements.

Instance details

Defined in Lucid.Base

(Monad m, a ~ ()) => TermRaw Text (HtmlT m a) #

Given children immediately, just use that and expect no attributes.

Instance details

Defined in Lucid.Base

Methods

termRaw :: Text -> Text -> HtmlT m a #

termRawWith :: Text -> [Attribute] -> Text -> HtmlT m a #

(Monad m, ToHtml f, a ~ ()) => TermRaw [Attribute] (f -> HtmlT m a) #

Given attributes, expect more child input.

Instance details

Defined in Lucid.Base

Methods

termRaw :: Text -> [Attribute] -> f -> HtmlT m a #

termRawWith :: Text -> [Attribute] -> [Attribute] -> f -> HtmlT m a #

class ToHtml a where #

Can be converted to HTML.

Methods

toHtml :: Monad m => a -> HtmlT m () #

Convert to HTML, doing HTML escaping.

toHtmlRaw :: Monad m => a -> HtmlT m () #

Convert to HTML without any escaping.

Instances
ToHtml String # 
Instance details

Defined in Lucid.Base

Methods

toHtml :: Monad m => String -> HtmlT m () #

toHtmlRaw :: Monad m => String -> HtmlT m () #

ToHtml ByteString #

This instance requires the ByteString to contain UTF-8 encoded text, for the toHtml method. The toHtmlRaw method doesn't care, but the overall HTML rendering methods in this module assume UTF-8.

Since: 2.9.5

Instance details

Defined in Lucid.Base

Methods

toHtml :: Monad m => ByteString -> HtmlT m () #

toHtmlRaw :: Monad m => ByteString -> HtmlT m () #

ToHtml ByteString #

This instance requires the ByteString to contain UTF-8 encoded text, for the toHtml method. The toHtmlRaw method doesn't care, but the overall HTML rendering methods in this module assume UTF-8.

Since: 2.9.5

Instance details

Defined in Lucid.Base

Methods

toHtml :: Monad m => ByteString -> HtmlT m () #

toHtmlRaw :: Monad m => ByteString -> HtmlT m () #

ToHtml Text # 
Instance details

Defined in Lucid.Base

Methods

toHtml :: Monad m => Text -> HtmlT m () #

toHtmlRaw :: Monad m => Text -> HtmlT m () #

ToHtml Text # 
Instance details

Defined in Lucid.Base

Methods

toHtml :: Monad m => Text -> HtmlT m () #

toHtmlRaw :: Monad m => Text -> HtmlT m () #

(a ~ (), m ~ Identity) => ToHtml (HtmlT m a) #

Since: 2.9.8

Instance details

Defined in Lucid.Base

Methods

toHtml :: Monad m0 => HtmlT m a -> HtmlT m0 () #

toHtmlRaw :: Monad m0 => HtmlT m a -> HtmlT m0 () #

class With a where #

With an element use these attributes. An overloaded way of adding attributes either to an element accepting attributes-and-children or one that just accepts attributes. See the two instances.

Methods

with #

Arguments

:: a

Some element, either Html a or Html a -> Html a.

-> [Attribute] 
-> a 

With the given element(s), use the given attributes.

Instances
Functor m => With (HtmlT m a -> HtmlT m a) #

For the contentful elements: div_

Instance details

Defined in Lucid.Base

Methods

with :: (HtmlT m a -> HtmlT m a) -> [Attribute] -> HtmlT m a -> HtmlT m a #

Functor m => With (HtmlT m a) #

For the contentless elements: br_

Instance details

Defined in Lucid.Base

Methods

with :: HtmlT m a -> [Attribute] -> HtmlT m a #