Safe Haskell	None
Language	Haskell98

Lucid.Base

Contents

Rendering
Running
Combinators
Types
Classes

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 -> 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 both arguments for a top-level call. See evalHtmlT and execHtmlT for easier to use functions.

Combinators

makeElement

Arguments

:: Monad m
=> Text	Name.
-> HtmlT m a	Children HTML.
-> HtmlT m a	A parent element.

Make an HTML builder.

makeElementNoEnd

Arguments

:: Monad m
=> Text	Name.
-> HtmlT m ()	A parent element.

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

makeXmlElementNoEnd

Arguments

:: Monad 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.

data 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.

Instances

MonadTrans HtmlT	Used for `lift`.
(Monad m, (~) * a ()) => TermRaw Text (HtmlT m a)	Given children immediately, just use that and expect no attributes.
Monad m => Monad (HtmlT m)	Basically acts like Writer.
Monad m => Functor (HtmlT m)	Just re-uses Monad.
Monad m => Applicative (HtmlT m)	Based on the monad instance.
MonadIO m => MonadIO (HtmlT m)	If you want to use IO in your HTML generation.
(Monad m, ToHtml f, (~) * a ()) => TermRaw [Attribute] (f -> HtmlT m a)	Given attributes, expect more child input.
(Monad m, (~) * f (HtmlT m a)) => Term [Attribute] (f -> HtmlT m a)	Given attributes, expect more child input.
(~) (* -> *) m Identity => Show (HtmlT m a)	Just calls `renderText`.
(Monad m, (~) * a ()) => IsString (HtmlT m a)	We pack it via string. Could possibly encode straight into a builder. That might be faster.
((~) * a (), Monad m) => Monoid (HtmlT m a)	Monoid is right-associative, a la the `Builder` in it.
Monad m => With (HtmlT m a -> HtmlT m a)	For the contentful elements: `div_`
Monad m => With (HtmlT m a)	For the contentless elements: `br_`
Monad m => Term (HtmlT m a) (HtmlT m a)	Given children immediately, just use that and expect no attributes.

newtype Attribute

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

Constructors

Attribute (Text, Text)

Instances

Eq Attribute
Show Attribute
TermRaw Text Attribute	Some termRaws (like `style_`, `title_`) can be used for attributes as well as elements.
Term Text Attribute	Some terms (like `style_`, `title_`) can be used for attributes as well as elements.
(Monad m, ToHtml f, (~) * a ()) => TermRaw [Attribute] (f -> HtmlT m a)	Given attributes, expect more child input.
(Monad m, (~) * f (HtmlT m a)) => Term [Attribute] (f -> HtmlT m a)	Given attributes, expect more child input.

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.
(Monad m, (~) * f (HtmlT m a)) => Term [Attribute] (f -> HtmlT m a)	Given attributes, expect more child input.
Monad m => Term (HtmlT m a) (HtmlT m a)	Given children immediately, just use that and expect no attributes.

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.
(Monad m, (~) * a ()) => TermRaw Text (HtmlT m a)	Given children immediately, just use that and expect no attributes.
(Monad m, ToHtml f, (~) * a ()) => TermRaw [Attribute] (f -> HtmlT m a)	Given attributes, expect more child input.

class ToHtml a where

Can be converted to HTML.

Methods

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

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

Instances

ToHtml String
ToHtml Text
ToHtml Text

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

Monad m => With (HtmlT m a -> HtmlT m a)	For the contentful elements: `div_`
Monad m => With (HtmlT m a)	For the contentless elements: `br_`