Data.CSS.Preprocessor.Conditions.Expr

Evaluates CSS media queries for import & media. INTERNAL MODULE

Documentation

type Expr = [Op]

A parsed (post-order) expression.

data Op

Operators understood by media queries.

Constructors

And

Is true if both operands are true

Or

Is true if either operand is true

Not

Is true if it's operand isn't.

Var Text

Queries the value of an externally-specified parameter.

Tok Token

Tokens to be evaluated as specified by caller.

MkRatio

Pushes a ratio value to stack, for querying screensize.

Less

Is the left operand smaller than right?

LessEq

Is the left operand smaller or the same as right?

Equal

Are the operands the same?

Greater

Is the left operand bigger than right?

GreaterEq

Is the left operand bigger or the same as right?

Instances

Eq Op

Defined in Data.CSS.Preprocessor.Conditions.Expr

Methods

(==) :: Op -> Op -> Bool

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

Show Op

Defined in Data.CSS.Preprocessor.Conditions.Expr

Methods

showsPrec :: Int -> Op -> ShowS

show :: Op -> String

showList :: [Op] -> ShowS

parse :: Token -> [Token] -> (Expr, [Token])

Parses a media query to postorder form, returning the tokens after the given delimiter.

parse' :: [Token] -> [(Op, Int)] -> Expr

Parses a media query to postorder form, given an operator stack.

eval :: (Text -> Datum) -> (Token -> Datum) -> Expr -> Bool

Evaluates a media query with the given functions for evaluating vars & tokens.

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