Text.Blaze.Internal

The BlazeMarkup core, consisting of functions that offer the power to generate custom markup elements. It also offers user-centric functions, which are exposed through Blaze.

While this module is exported, usage of it is not recommended, unless you know what you are doing. This module might undergo changes at any time.

Important types.

data ChoiceString

A string denoting input from different string representations.

Constructors

Static !StaticString

Static data

String String

A Haskell String

Text Text

A Text value

ByteString ByteString

An encoded bytestring

PreEscaped ChoiceString

A pre-escaped string

External ChoiceString

External data in style/script tags, should be checked for validity

AppendChoiceString ChoiceString ChoiceString

Concatenation

EmptyChoiceString

Empty string

Instances

IsString ChoiceString

Monoid ChoiceString

data StaticString

A static string that supports efficient output to all possible backends.

Constructors

StaticString

Fields

getString :: String -> String

Appending haskell string

getUtf8ByteString :: ByteString

UTF-8 encoded bytestring

getText :: Text

Text value

Instances

IsString StaticString

data MarkupM a

The core Markup datatype.

Constructors

forall b . Parent StaticString StaticString StaticString (MarkupM b)

Tag, open tag, end tag, content

forall b . CustomParent ChoiceString (MarkupM b)

Custom parent

Leaf StaticString StaticString StaticString

Tag, open tag, end tag

CustomLeaf ChoiceString Bool

Custom leaf

Content ChoiceString

HTML content

forall b c . Append (MarkupM b) (MarkupM c)

Concatenation of two HTML pieces

AddAttribute StaticString StaticString ChoiceString (MarkupM a)

Add an attribute to the inner HTML. Raw key, key, value, HTML to receive the attribute.

AddCustomAttribute ChoiceString ChoiceString (MarkupM a)

Add a custom attribute to the inner HTML.

Empty

Empty HTML.

Instances

Monad MarkupM

Functor MarkupM

ToMarkup Markup

IsString (MarkupM a)

Monoid a => Monoid (MarkupM a)

Attributable (MarkupM a)

ToMarkup [Markup]

Attributable (MarkupM a -> MarkupM b)

Typeable (* -> *) MarkupM

type Markup = MarkupM ()

Simplification of the MarkupM datatype.

data Tag

Type for an HTML tag. This can be seen as an internal string type used by BlazeMarkup.

Instances

IsString Tag

data Attribute

Type for an attribute.

Instances

Monoid Attribute

data AttributeValue

The type for the value part of an attribute.

Instances

IsString AttributeValue

Monoid AttributeValue

ToValue AttributeValue

Creating custom tags and attributes.

customParent

Arguments

:: Tag

Element tag

-> Markup

Content

-> Markup

Resulting markup

Create a custom parent element

customLeaf

Arguments

:: Tag

Element tag

-> Bool

Close the leaf?

-> Markup

Resulting markup

Create a custom leaf element

attribute

Arguments

:: Tag

Raw key

-> Tag

Shared key string for the HTML attribute.

-> AttributeValue

Value for the HTML attribute.

-> Attribute

Resulting HTML attribute.

Create an HTML attribute that can be applied to an HTML element later using the ! operator.

dataAttribute

Arguments

:: Tag

Name of the attribute.

-> AttributeValue

Value for the attribute.

-> Attribute

Resulting HTML attribute.

From HTML 5 onwards, the user is able to specify custom data attributes.

An example:

<p data-foo="bar">Hello.</p>

We support this in BlazeMarkup using this funcion. The above fragment could be described using BlazeMarkup with:

p ! dataAttribute "foo" "bar" $ "Hello."

customAttribute

Arguments

:: Tag

Name of the attribute

-> AttributeValue

Value for the attribute

-> Attribute

Resulting HTML attribtue

Create a custom attribute. This is not specified in the HTML spec, but some JavaScript libraries rely on it.

An example:

<select dojoType="select">foo</select>

Can be produced using:

select ! customAttribute "dojoType" "select" $ "foo"

Converting values to Markup.

text

Arguments

:: Text

Text to render.

-> Markup

Resulting HTML fragment.

Render text. Functions like these can be used to supply content in HTML.

preEscapedText

Arguments

:: Text

Text to insert

-> Markup

Resulting HTML fragment

Render text without escaping.

lazyText

Arguments

:: Text

Text to insert

-> Markup

Resulting HTML fragment

A variant of text for lazy Text.

preEscapedLazyText

Arguments

:: Text

Text to insert

-> Markup

Resulting HTML fragment

A variant of preEscapedText for lazy Text

string

Arguments

:: String

String to insert.

-> Markup

Resulting HTML fragment.

Create an HTML snippet from a String.

preEscapedString

Arguments

:: String

String to insert.

-> Markup

Resulting HTML fragment.

Create an HTML snippet from a String without escaping

unsafeByteString

Arguments

:: ByteString

Value to insert.

-> Markup

Resulting HTML fragment.

Insert a ByteString. This is an unsafe operation:

• The ByteString could have the wrong encoding.
• The ByteString might contain illegal HTML characters (no escaping is done).

unsafeLazyByteString

Arguments

:: ByteString

Value to insert

-> Markup

Resulting HTML fragment

Insert a lazy ByteString. See unsafeByteString for reasons why this is an unsafe operation.

Converting values to tags.

textTag

Arguments

:: Text

Text to create a tag from

-> Tag

Resulting tag

Create a Tag from some Text.

stringTag

Arguments

:: String

String to create a tag from

-> Tag

Resulting tag

Create a Tag from a String.

Converting values to attribute values.

textValue

Arguments

:: Text

The actual value.

-> AttributeValue

Resulting attribute value.

Render an attribute value from Text.

preEscapedTextValue

Arguments

:: Text

The actual value

-> AttributeValue

Resulting attribute value

Render an attribute value from Text without escaping.

lazyTextValue

Arguments

:: Text

The actual value

-> AttributeValue

Resulting attribute value

A variant of textValue for lazy Text

preEscapedLazyTextValue

Arguments

:: Text

The actual value

-> AttributeValue

Resulting attribute value

A variant of preEscapedTextValue for lazy Text

stringValue :: String -> AttributeValue

Create an attribute value from a String.

preEscapedStringValue :: String -> AttributeValue

Create an attribute value from a String without escaping.

unsafeByteStringValue

Arguments

:: ByteString

ByteString value

-> AttributeValue

Resulting attribute value

Create an attribute value from a ByteString. See unsafeByteString for reasons why this might not be a good idea.

unsafeLazyByteStringValue

Arguments

:: ByteString

ByteString value

-> AttributeValue

Resulting attribute value

Create an attribute value from a lazy ByteString. See unsafeByteString for reasons why this might not be a good idea.

Setting attributes

class Attributable h where

Used for applying attributes. You should not define your own instances of this class.

Methods

(!) :: h -> Attribute -> h

Apply an attribute to an element.

Example:

img ! src "foo.png"

Result:

<img src="foo.png" />

This can be used on nested elements as well.

Example:

p ! style "float: right" $ "Hello!"

Result:

<p style="float: right">Hello!</p>

Instances

Attributable (MarkupM a)

Attributable (MarkupM a -> MarkupM b)

(!?) :: Attributable h => h -> (Bool, Attribute) -> h

Shorthand for setting an attribute depending on a conditional.

Example:

p !? (isBig, A.class "big") $ "Hello"

Gives the same result as:

(if isBig then p ! A.class "big" else p) "Hello"

Modifying Markup elements

contents :: MarkupM a -> MarkupM b

Take only the text content of an HTML tree.

contents $ do
    p ! $ "Hello "
    p ! $ "Word!"

Result:

Hello World!

external :: MarkupM a -> MarkupM a

Mark HTML as external data. External data can be:

• CSS data in a style tag;
• Script data in a script tag.

This function is applied automatically when using the style or script combinators.

Querying Markup elements

null :: MarkupM a -> Bool

Check if a Markup value is completely empty (renders to the empty string).