Safe Haskell	None
Language	Haskell2010

Data.CSS.Preprocessor.Conditions.Expr

Description

Evaluates CSS media queries for import & media. INTERNAL MODULE

Synopsis

Documentation

A parsed (post-order) expression.

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 details

Eq Op Source #
Instance details Defined in Data.CSS.Preprocessor.Conditions.Expr Methods (==) :: Op -> Op -> Bool (/=) :: Op -> Op -> Bool
Show Op Source #
Instance details Defined in Data.CSS.Preprocessor.Conditions.Expr Methods showsPrec :: Int -> Op -> ShowS show :: Op -> String showList :: [Op] -> ShowS

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

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

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

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

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

Dynamic types for evaluating media queries.

Constructors

Instances details

Eq Datum Source #
Instance details Defined in Data.CSS.Preprocessor.Conditions.Expr Methods (==) :: Datum -> Datum -> Bool (/=) :: Datum -> Datum -> Bool