fay- A compiler for Fay, a Haskell subset that compiles to JavaScript.

Safe HaskellNone



All Fay types and instances.



data JsLit Source

Literal value type.


Eq JsLit 
Show JsLit 
IsString JsLit

Just handy to have.

Printable JsLit

Print literals. These need some special encoding for JS-format literals. Could use the Text.JSON library.

data JsName Source

A name of some kind.


Eq JsName 
Show JsName 
Printable JsName

Print one of the kinds of names.

class Printable a whereSource

Print some value.


printJS :: a -> Printer ()Source


Printable String

Just write out strings.

Printable ModulePath

Print a module path.

Printable JsLit

Print literals. These need some special encoding for JS-format literals. Could use the Text.JSON library.

Printable JsName

Print one of the kinds of names.

Printable JsExp

Print an expression.

Printable JsStmt

Print a single statement.

Printable [JsStmt]

Print a list of statements.

Printable (Printer ())

A printer is a printable.

data Fay a Source

The JavaScript FFI interfacing monad.

data CompileReader Source

Configuration and globals for the compiler.




readerConfig :: Config

The compilation configuration.

readerCompileLit :: Literal -> Compile JsExp
readerCompileDecls :: Bool -> [Decl] -> Compile [JsStmt]

data CompileWriter Source

Things written out by the compiler.




writerCons :: [JsStmt]


writerFayToJs :: [(String, JsExp)]

Fay to JS dispatchers.

writerJsToFay :: [(String, JsExp)]

JS to Fay dispatchers.


data Config Source

Configuration of the compiler. The fields with a leading underscore


Show Config 
Default Config

Default configuration.

data CompileState Source

State of the compiler.




stateInterfaces :: Map ModuleName Symbols

Exported identifiers for all modules

stateRecordTypes :: [(QName, [QName])]

Map types to constructors

stateRecords :: [(QName, [Name])]

Map constructors to fields

stateNewtypes :: [(QName, Maybe QName, Type)]

Newtype constructor, destructor, wrapped type tuple

stateImported :: [(ModuleName, FilePath)]

Map of all imported modules and their source locations.

stateNameDepth :: Integer

Depth of the current lexical scope, used for creating unshadowing variables.

stateModuleName :: ModuleName

Name of the module currently being compiled.

stateJsModulePaths :: Set ModulePath

Module paths that have code generated for them.

stateUseFromString :: Bool

Use JS Strings instead of [Char] for string literals?

stateTypeSigs :: Map QName Type

Module level declarations having explicit type signatures

data FundamentalType Source

These are the data types that are serializable directly to native JS data types. Strings, floating points and arrays. The others are: actions in the JS monad, which are thunks that shouldn't be forced when serialized but wrapped up as JS zero-arg functions, and unknown types can't be converted but should at least be forced.

data PrintState Source

The state of the pretty printer.




psPretty :: Bool

Are we to pretty print?

psLine :: Int

The current line.

psColumn :: Int

Current column.

psMappings :: [Mapping]

Source mappings.

psIndentLevel :: Int

Current indentation level.

psOutput :: [String]

The current output. TODO: Make more efficient.

psNewline :: Bool

Just outputted a newline?

newtype Printer a Source

The printer monad.



data SerializeContext Source

The serialization context indicates whether we're currently serializing some value or a particular field in a user-defined data type.

data ModulePath Source

The name of a module split into a list for code generation.


mkModulePath :: ModuleName a -> ModulePathSource

Construct the complete ModulePath from a ModuleName.

mkModulePaths :: ModuleName a -> [ModulePath]Source

Construct intermediate module paths from a ModuleName. mkModulePaths A.B => [[A], [A,B]]

mkModulePathFromQName :: QName a -> ModulePathSource

Converting a QName to a ModulePath is only relevant for constructors since they can conflict with module names.