yesod-sqlite-demo-0.1.0.0
Safe HaskellSafe-Inferred
LanguageHaskell2010

Expr

Documentation

data Expr Source #

Constructors

Lit Double 
Var Text 
Neg Expr 
Add Expr Expr 
Sub Expr Expr 
Mul Expr Expr 
Div Expr Expr 

Instances

Instances details
Show Expr Source # 
Instance details

Defined in Expr

Methods

showsPrec :: Int -> Expr -> ShowS #

show :: Expr -> String #

showList :: [Expr] -> ShowS #

evaluateExpr :: Map Text Double -> Expr -> Maybe Double Source #

isValidName :: Text -> Bool Source #

parseExpr :: Stream s Identity Char => s -> Either ParseError Expr Source #

variablesOf :: Expr -> Set Text Source #