lua-2.3.1: Lua, an embeddable scripting language
Copyright© 2007–2012 Gracjan Polak;
© 2012–2016 Ömer Sinan Ağacan;
© 2017-2023 Albert Krewinkel
LicenseMIT
MaintainerAlbert Krewinkel <tarleb@hslua.org>
Stabilitybeta
Portabilitynon-portable (depends on GHC)
Safe HaskellSafe-Inferred
LanguageHaskell2010

Lua.Types

Description

The core Lua types, including mappings of Lua types to Haskell.

Synopsis

Documentation

newtype State Source #

An opaque structure that points to a thread and indirectly (through the thread) to the whole state of a Lua interpreter. The Lua library is fully reentrant: it has no global variables. All information about a state is accessible through this structure.

Synonym for lua_State *. See lua_State.

Constructors

State (Ptr ()) 

Instances

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Generic State Source # 
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Associated Types

type Rep State :: Type -> Type #

Methods

from :: State -> Rep State x #

to :: Rep State x -> State #

Eq State Source # 
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Methods

(==) :: State -> State -> Bool #

(/=) :: State -> State -> Bool #

type Rep State Source # 
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type Rep State = D1 ('MetaData "State" "Lua.Types" "lua-2.3.1-4rX385mkVbY6qZfwv2UmJn" 'True) (C1 ('MetaCons "State" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 (Ptr ()))))

type Reader = FunPtr (State -> Ptr () -> Ptr CSize -> IO (Ptr CChar)) Source #

The reader function used by load. Every time it needs another piece of the chunk, lua_load calls the reader, passing along its data parameter. The reader must return a pointer to a block of memory with a new piece of the chunk and set size to the block size. The block must exist until the reader function is called again. To signal the end of the chunk, the reader must return NULL or set size to zero. The reader function may return pieces of any size greater than zero.

See lua_Reader.

newtype TypeCode Source #

Integer code used to encode the type of a Lua value.

Constructors

TypeCode 

Fields

Instances

Instances details
Show TypeCode Source # 
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Eq TypeCode Source # 
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Ord TypeCode Source # 
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type CFunction = FunPtr PreCFunction Source #

Type for C functions.

In order to communicate properly with Lua, a C function must use the following protocol, which defines the way parameters and results are passed: a C function receives its arguments from Lua in its stack in direct order (the first argument is pushed first). So, when the function starts, lua_gettop returns the number of arguments received by the function. The first argument (if any) is at index 1 and its last argument is at index lua_gettop. To return values to Lua, a C function just pushes them onto the stack, in direct order (the first result is pushed first), and returns the number of results. Any other value in the stack below the results will be properly discarded by Lua. Like a Lua function, a C function called by Lua can also return many results.

See lua_CFunction.

type PreCFunction = State -> IO NumResults Source #

Type of Haskell functions that can be turned into C functions.

This is the same as a dereferenced CFunction.

type WarnFunction = FunPtr (Ptr () -> CString -> LuaBool -> IO ()) Source #

The type of warning functions, called by Lua to emit warnings. The first parameter is an opaque pointer set by lua_setwarnf. The second parameter is the warning message. The third parameter is a boolean that indicates whether the message is to be continued by the message in the next call.

See warn for more details about warnings.

type PreWarnFunction = Ptr () -> CString -> LuaBool -> IO () Source #

Type of Haskell functions that can be turned into a WarnFunction.

This is the same as a dereferenced WarnFunction.

newtype LuaBool Source #

Boolean value returned by a Lua C API function. This is a CInt and should be interpreted as False iff the value is 0, True otherwise.

Constructors

LuaBool CInt 

Instances

Instances details
Storable LuaBool Source # 
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Show LuaBool Source # 
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Eq LuaBool Source # 
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Methods

(==) :: LuaBool -> LuaBool -> Bool #

(/=) :: LuaBool -> LuaBool -> Bool #

newtype Integer Source #

The type of integers in Lua.

By default this type is Int64, but that can be changed to different values in Lua. (See LUA_INT_TYPE in luaconf.h.)

See lua_Integer.

Constructors

Integer Int64 

Instances

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Bounded Integer Source # 
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Enum Integer Source # 
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Num Integer Source # 
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Read Integer Source # 
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Integral Integer Source # 
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Real Integer Source # 
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Show Integer Source # 
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Eq Integer Source # 
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Methods

(==) :: Integer -> Integer -> Bool #

(/=) :: Integer -> Integer -> Bool #

Ord Integer Source # 
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newtype Number Source #

The type of floats in Lua.

By default this type is Double, but that can be changed in Lua to a single float or a long double. (See LUA_FLOAT_TYPE in luaconf.h.)

See lua_Number.

Constructors

Number Double 

Instances

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Floating Number Source # 
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RealFloat Number Source # 
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Num Number Source # 
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Read Number Source # 
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Fractional Number Source # 
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Real Number Source # 
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RealFrac Number Source # 
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Methods

properFraction :: Integral b => Number -> (b, Number) #

truncate :: Integral b => Number -> b #

round :: Integral b => Number -> b #

ceiling :: Integral b => Number -> b #

floor :: Integral b => Number -> b #

Show Number Source # 
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Eq Number Source # 
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Methods

(==) :: Number -> Number -> Bool #

(/=) :: Number -> Number -> Bool #

Ord Number Source # 
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newtype StackIndex Source #

A stack index

Constructors

StackIndex 

Fields

Instances

Instances details
Enum StackIndex Source # 
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Num StackIndex Source # 
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Show StackIndex Source # 
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Eq StackIndex Source # 
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Ord StackIndex Source # 
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newtype NumArgs Source #

The number of arguments consumed curing a function call.

Constructors

NumArgs 

Fields

Instances

Instances details
Num NumArgs Source # 
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Show NumArgs Source # 
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Eq NumArgs Source # 
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Methods

(==) :: NumArgs -> NumArgs -> Bool #

(/=) :: NumArgs -> NumArgs -> Bool #

Ord NumArgs Source # 
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newtype NumResults Source #

The number of results returned by a function call.

Constructors

NumResults 

Fields

newtype OPCode Source #

Relational operator code.

Constructors

OPCode CInt 

Instances

Instances details
Storable OPCode Source # 
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Show OPCode Source # 
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Eq OPCode Source # 
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Methods

(==) :: OPCode -> OPCode -> Bool #

(/=) :: OPCode -> OPCode -> Bool #

newtype ArithOPCode Source #

Arithmetic operator code.

Constructors

ArithOPCode CInt 

Instances

Instances details
Storable ArithOPCode Source # 
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Show ArithOPCode Source # 
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Eq ArithOPCode Source # 
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newtype StatusCode Source #

Integer code used to signal the status of a thread or computation.

Constructors

StatusCode CInt 

Instances

Instances details
Storable StatusCode Source # 
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Show StatusCode Source # 
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Eq StatusCode Source # 
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Garbage-Collection

newtype GCCode Source #

Garbage-collection options.

Constructors

GCCode CInt 

Instances

Instances details
Storable GCCode Source # 
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Show GCCode Source # 
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Eq GCCode Source # 
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Methods

(==) :: GCCode -> GCCode -> Bool #

(/=) :: GCCode -> GCCode -> Bool #