Data.CSS.Preprocessor.Conditions

Evaluates conditional CSS rules. Parse a CSS stylesheet to ConditionalStyles to evaluate document & supports rules. Call loadImports to resolve any import rules to media rules. And call resolve to convert into another StyleSheet instance whilst resolving media rules.

Documentation

data ConditionalStyles p

Collects and evaluates conditional at-rules.

Constructors

ConditionalStyles

Fields

• hostURL :: URI

  The URL to the webpage being styled, for `@document` rules.

• mediaDocument :: String

  The type of document, `@document domain(...)` rules.

• isUnstyled :: Bool

  Whether the page provided any of it's own styling (valid or not)

• rules :: [ConditionalRule p]

  Queued style rules, to be evaluated later.

• propertyParser :: p

  PropertyParser to test against for `@supports` rules.

• layers :: Tree

  Known-named @layers.

• layerNamespace :: [Text]

  The current @layer, for resolving nesting

• layerPath' :: [Int]

  The integral path to the current @layer, for resolving nesting

Instances

PropertyParser p => StyleSheet (ConditionalStyles p)

Defined in Data.CSS.Preprocessor.Conditions

Methods

setPriority :: Int -> ConditionalStyles p -> ConditionalStyles p

setPriorities :: [Int] -> ConditionalStyles p -> ConditionalStyles p

addRule :: ConditionalStyles p -> StyleRule -> ConditionalStyles p

addAtRule :: ConditionalStyles p -> Text -> [Token] -> (ConditionalStyles p, [Token])

conditionalStyles :: PropertyParser p => URI -> String -> ConditionalStyles p

Constructs an empty ConditionalStyles.

data ConditionalRule p

Style rules that can be queued in a ConditionalStyles.

Constructors

Priority [Int]

StyleRule' StyleRule

AtRule Text [Token]

External Expr URI

Internal Expr (ConditionalStyles p)

extractImports :: (Text -> Datum) -> (Token -> Datum) -> ConditionalStyles p -> [URI]

Returns `@import` URLs that need to be imported.

resolveImports :: ConditionalStyles p -> [(URI, ConditionalStyles p)] -> ConditionalStyles p

Substitutes external values in for `@import` rules.

loadImports :: PropertyParser p => (URI -> IO Text) -> (Text -> Datum) -> (Token -> Datum) -> ConditionalStyles p -> [URI] -> IO (ConditionalStyles p)

Evaluates a given "loader" to resolve any `@import` rules.

resolve :: StyleSheet s => (Text -> Datum) -> (Token -> Datum) -> s -> ConditionalStyles p -> s

Evaluates any media queries, returning a new StyleSheet with the queued operations.

testIsStyled :: ConditionalStyles p -> ConditionalStyles p

Flags whether any style rules have been applied yet, for the sake of evaluating "@document unstyled {...}".

data Datum

Dynamic types for evaluating media queries.

Constructors

B Bool

N Float

R

Fields

• minv :: Float
• maxv :: Float

Instances

Eq Datum

Defined in Data.CSS.Preprocessor.Conditions.Expr

Methods

(==) :: Datum -> Datum -> Bool

(/=) :: Datum -> Datum -> Bool