Portability | portable |
---|---|
Stability | experimental |
Maintainer | github.com/justinethier |
Safe Haskell | None |
Language.Scheme.Core
Description
This module contains Core functionality, primarily Scheme expression evaluation.
- evalLisp :: Env -> LispVal -> IOThrowsError LispVal
- evalLisp' :: Env -> LispVal -> IO (ThrowsError LispVal)
- evalString :: Env -> String -> IO String
- evalAndPrint :: Env -> String -> IO ()
- apply :: LispVal -> LispVal -> [LispVal] -> IOThrowsError LispVal
- continueEval :: Env -> LispVal -> LispVal -> IOThrowsError LispVal
- runIOThrows :: IOThrowsError String -> IO (Maybe String)
- runIOThrowsREPL :: IOThrowsError String -> IO String
- nullEnvWithImport :: IO Env
- primitiveBindings :: IO Env
- r5rsEnv :: IO Env
- r5rsEnv' :: IO Env
- r7rsEnv :: IO Env
- r7rsEnv' :: IO Env
- r7rsTimeEnv :: IO Env
- version :: String
- findFileOrLib :: [Char] -> ErrorT LispError IO String
- getDataFileFullPath :: String -> IO String
- replaceAtIndex :: Int -> a -> [a] -> [a]
- registerExtensions :: Env -> (FilePath -> IO FilePath) -> IO ()
- showBanner :: IO ()
- showLispError :: LispError -> IO String
- substr :: (LispVal, LispVal, LispVal) -> IOThrowsError LispVal
- updateList :: LispVal -> LispVal -> LispVal -> IOThrowsError LispVal
- updateVector :: LispVal -> LispVal -> LispVal -> IOThrowsError LispVal
- updateByteVector :: LispVal -> LispVal -> LispVal -> IOThrowsError LispVal
- meval :: Env -> LispVal -> LispVal -> IOThrowsError LispVal
Scheme code evaluation
evalLisp :: Env -> LispVal -> IOThrowsError LispValSource
Evaluate a lisp data structure and return a value for use by husk
evalAndPrint :: Env -> String -> IO ()Source
Evaluate a string and print results to console
Arguments
:: LispVal | Current continuation |
-> LispVal | Function or continuation to execute |
-> [LispVal] | Arguments |
-> IOThrowsError LispVal | Final value of computation |
Call into a Scheme function
Arguments
:: Env | Current environment |
-> LispVal | Current continuation |
-> LispVal | Value of previous computation |
-> IOThrowsError LispVal | Final value of computation |
A support function for eval; eval calls into this function instead of returning values directly. continueEval then uses the continuation argument to manage program control flow.
runIOThrows :: IOThrowsError String -> IO (Maybe String)Source
Execute an IO action and return error or Nothing if no error was thrown.
runIOThrowsREPL :: IOThrowsError String -> IO StringSource
Execute an IO action and return result or an error message. This is intended for use by a REPL, where a result is always needed regardless of type.
Core data
nullEnvWithImport :: IO EnvSource
An empty environment with the %import function. This is presently just intended for internal use by the compiler.
primitiveBindings :: IO EnvSource
Environment containing the primitive forms that are built into the Scheme language. This function only includes forms that are implemented in Haskell; derived forms implemented in Scheme (such as let, list, etc) are available in the standard library which must be pulled into the environment using (load)
For the purposes of using husk as an extension language, r5rsEnv will probably be more useful.
Load the standard r5rs environment, including libraries, but do not create the (import) binding
Load the standard r7rs environment
TODO: This is just a stub, do not try using it yet!
Load haskell bindings used for the r7rs time library
Utility functions
findFileOrLib :: [Char] -> ErrorT LispError IO StringSource
Attempts to find the file both in the current directory and in the husk libraries. If the file is not found in the current directory but exists as a husk library, return the full path to the file in the library. Otherwise just return the given filename.
getDataFileFullPath :: String -> IO StringSource
Get the full path to a data file installed for husk
replaceAtIndex :: Int -> a -> [a] -> [a]Source
Replace a list element, by index. Taken from: http:stackoverflow.comquestions10133361/haskell-replace-element-in-list
registerExtensions :: Env -> (FilePath -> IO FilePath) -> IO ()Source
Register optional SRFI extensions
showBanner :: IO ()Source
A utility function to display the husk console banner
showLispError :: LispError -> IO StringSource
This is the recommended function to use to display a lisp error, instead of just using show directly.
substr :: (LispVal, LispVal, LispVal) -> IOThrowsError LispValSource
A helper function for the special form (string-set!)
updateList :: LispVal -> LispVal -> LispVal -> IOThrowsError LispValSource
A helper function for (list-set!)
updateVector :: LispVal -> LispVal -> LispVal -> IOThrowsError LispValSource
A helper function for the special form (vector-set!)
updateByteVector :: LispVal -> LispVal -> LispVal -> IOThrowsError LispValSource
A helper function for the special form (bytevector-u8-set!)