lua

package module
v0.0.0-...-15fa5f4 Latest Latest
Warning

This package is not in the latest version of its module.

 Go to latest Published: Oct 13, 2016 License: MIT Imports: 23 Imported by: 0

README 

===============================================================================
GopherLua: VM and compiler for Lua in Go.
===============================================================================

.. image:: https://godoc.org/github.com/yuin/gopher-lua?status.svg
    :target: http://godoc.org/github.com/yuin/gopher-lua

.. image:: https://travis-ci.org/yuin/gopher-lua.svg
    :target: https://travis-ci.org/yuin/gopher-lua

.. image:: https://coveralls.io/repos/yuin/gopher-lua/badge.svg
    :target: https://coveralls.io/r/yuin/gopher-lua

.. image:: https://badges.gitter.im/Join%20Chat.svg
    :alt: Join the chat at https://gitter.im/yuin/gopher-lua
    :target: https://gitter.im/yuin/gopher-lua?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge

|

GopherLua is a Lua5.1 VM and compiler written in Go. GopherLua has a same goal
with Lua: **Be a scripting language with extensible semantics** . It provides
Go APIs that allow you to easily embed a scripting language to your Go host
programs.

.. contents::
   :depth: 1

----------------------------------------------------------------
Design principle
----------------------------------------------------------------

- Be a scripting language with extensible semantics.
- User-friendly Go API
    - The stack based API like the one used in the original Lua
      implementation will cause a performance improvements in GopherLua
      (It will reduce memory allocations and concrete type <-> interface conversions).
      GopherLua API is **not** the stack based API.
      GopherLua give preference to the user-friendliness over the performance.

----------------------------------------------------------------
How about performance?
----------------------------------------------------------------
GopherLua is not fast but not too slow, I think.

GopherLua has almost equivalent ( or little bit better ) performance as Python3 on micro benchmarks.

There are some benchmarks on the `wiki page <https://github.com/yuin/gopher-lua/wiki/Benchmarks>`_ .

----------------------------------------------------------------
Installation
----------------------------------------------------------------

.. code-block:: bash

   go get github.com/yuin/gopher-lua

GopherLua supports >= Go1.5.

----------------------------------------------------------------
Usage
----------------------------------------------------------------
GopherLua APIs perform in much the same way as Lua, **but the stack is used only
for passing arguments and receiving returned values.**

GopherLua supports channel operations. See **"Goroutines"** section.

Import a package.

.. code-block:: go

   import (
       "github.com/yuin/gopher-lua"
   )

Run scripts in the VM.

.. code-block:: go

   L := lua.NewState()
   defer L.Close()
   if err := L.DoString(`print("hello")`); err != nil {
       panic(err)
   }

.. code-block:: go

   L := lua.NewState()
   defer L.Close()
   if err := L.DoFile("hello.lua"); err != nil {
       panic(err)
   }

Refer to `Lua Reference Manual <http://www.lua.org/manual/5.1/>`_ and `Go doc <http://godoc.org/github.com/yuin/gopher-lua>`_ for further information.

Note that elements that are not commented in `Go doc <http://godoc.org/github.com/yuin/gopher-lua>`_ equivalent to `Lua Reference Manual <http://www.lua.org/manual/5.1/>`_ , except GopherLua uses objects instead of Lua stack indices.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Data model
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
All data in a GopherLua program is an ``LValue`` . ``LValue`` is an interface
type that has following methods.

- ``String() string``
- ``Type() LValueType``


Objects implement an LValue interface are

================ ========================= ================== =======================
 Type name        Go type                   Type() value       Constants
================ ========================= ================== =======================
 ``LNilType``      (constants)              ``LTNil``          ``LNil``
 ``LBool``         (constants)              ``LTBool``         ``LTrue``, ``LFalse``
 ``LNumber``        float64                 ``LTNumber``       ``-``
 ``LString``        string                  ``LTString``       ``-``
 ``LFunction``      struct pointer          ``LTFunction``     ``-``
 ``LUserData``      struct pointer          ``LTUserData``     ``-``
 ``LState``         struct pointer          ``LTThread``       ``-``
 ``LTable``         struct pointer          ``LTTable``        ``-``
 ``LChannel``       chan LValue             ``LTChannel``      ``-``
================ ========================= ================== =======================

You can test an object type in Go way(type assertion) or using a ``Type()`` value.

.. code-block:: go

   lv := L.Get(-1) // get the value at the top of the stack
   if str, ok := lv.(lua.LString); ok {
       // lv is LString
       fmt.Println(string(str))
   }
   if lv.Type() != lua.LTString {
       panic("string required.")
   }

.. code-block:: go

   lv := L.Get(-1) // get the value at the top of the stack
   if tbl, ok := lv.(*lua.LTable); ok {
       // lv is LTable
       fmt.Println(L.ObjLen(tbl))
   }

Note that ``LBool`` , ``LNumber`` , ``LString`` is not a pointer.

To test ``LNilType`` and ``LBool``, You **must** use pre-defined constants.

.. code-block:: go

   lv := L.Get(-1) // get the value at the top of the stack

   if lv == LTrue { // correct
   }

   if bl, ok == lv.(lua.LBool); ok && bool(bl) { // wrong
   }

In Lua, both ``nil`` and ``false`` make a condition false. ``LVIsFalse`` and ``LVAsBool`` implement this specification.

.. code-block:: go

   lv := L.Get(-1) // get the value at the top of the stack
   if LVIsFalse(lv) { // lv is nil or false
   }

   if LVAsBool(lv) { // lv is neither nil nor false
   }

Objects that based on go structs(``LFunction``. ``LUserData``, ``LTable``)
have some public methods and fields. You can use these methods and fields for
performance and debugging, but there are some limitations.

- Metatable does not work.
- No error handlings.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Callstack & Registry size
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Size of the callstack & registry is **fixed** for mainly performance.
You can change the default size of the callstack & registry.

.. code-block:: go

   lua.RegistrySize = 1024 * 20
   lua.CallStackSize = 1024
   L := lua.NewState()
   defer L.Close()

You can also create an LState object that has the callstack & registry size specified by ``Options`` .

.. code-block:: go

    L := lua.NewState(lua.Options{
        CallStackSize: 120,
        RegistrySize:  120*20,
    })

An LState object that has been created by ``*LState#NewThread()`` inherits the callstack & registry size from the parent LState object.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Miscellaneous lua.NewState options
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- **Options.SkipOpenLibs bool(default false)**
    - By default, GopherLua opens all built-in libraries when new LState is created.
    - You can skip this behaviour by setting this to ``true`` .
    - Using the various `OpenXXX(L *LState) int` functions you can open only those libraries that you require, for an example see below.
- **Options.IncludeGoStackTrace bool(default false)**
    - By default, GopherLua does not show Go stack traces when panics occur.
    - You can get Go stack traces by setting this to ``true`` .

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
API
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Refer to `Lua Reference Manual <http://www.lua.org/manual/5.1/>`_ and `Go doc(LState methods) <http://godoc.org/github.com/yuin/gopher-lua>`_ for further information.

+++++++++++++++++++++++++++++++++++++++++
Calling Go from Lua
+++++++++++++++++++++++++++++++++++++++++

.. code-block:: go

   func Double(L *lua.LState) int {
       lv := L.ToInt(1)             /* get argument */
       L.Push(lua.LNumber(lv * 2)) /* push result */
       return 1                     /* number of results */
   }

   func main() {
       L := lua.NewState()
       defer L.Close()
       L.SetGlobal("double", L.NewFunction(Double)) /* Original lua_setglobal uses stack... */
   }

.. code-block:: lua

   print(double(20)) -- > "40"

Any function registered with GopherLua is a ``lua.LGFunction``, defined in ``value.go``

.. code-block:: go

   type LGFunction func(*LState) int

Working with coroutines.

.. code-block:: go

   co := L.NewThread() /* create a new thread */
   fn := L.GetGlobal("coro").(*lua.LFunction) /* get function from lua */
   for {
       st, err, values := L.Resume(co, fn)
       if st == lua.ResumeError {
           fmt.Println("yield break(error)")
           fmt.Println(err.Error())
           break
       }

       for i, lv := range values {
           fmt.Printf("%v : %v\n", i, lv)
       }

       if st == lua.ResumeOK {
           fmt.Println("yield break(ok)")
           break
       }
   }

+++++++++++++++++++++++++++++++++++++++++
Opening a subset of builtin modules
+++++++++++++++++++++++++++++++++++++++++

The following demonstrates how to open a subset of the built-in modules in Lua, say for example to avoid enabling modules with access to local files or system calls.

main.go

.. code-block:: go

    func main() {
        L := lua.NewState(lua.Options{SkipOpenLibs: true})
        defer L.Close()
        for _, pair := range []struct {
            n string
            f lua.LGFunction
        }{
            {lua.LoadLibName, lua.OpenPackage}, // Must be first
            {lua.BaseLibName, lua.OpenBase},
            {lua.TabLibName, lua.OpenTable},
        } {
            if err := L.CallByParam(lua.P{
                Fn:      L.NewFunction(pair.f),
                NRet:    0,
                Protect: true,
            }, lua.LString(pair.n)); err != nil {
                panic(err)
            }
        }
        if err := L.DoFile("main.lua"); err != nil {
            panic(err)
        }
    }

+++++++++++++++++++++++++++++++++++++++++
Creating a module by Go
+++++++++++++++++++++++++++++++++++++++++

mymodule.go

.. code-block:: go

    package mymodule

    import (
        "github.com/yuin/gopher-lua"
    )

    func Loader(L *lua.LState) int {
        // register functions to the table
        mod := L.SetFuncs(L.NewTable(), exports)
        // register other stuff
        L.SetField(mod, "name", lua.LString("value"))

        // returns the module
        L.Push(mod)
        return 1
    }

    var exports = map[string]lua.LGFunction{
        "myfunc": myfunc,
    }

    func myfunc(L *lua.LState) int {
        return 0
    }

mymain.go

.. code-block:: go

    package main

    import (
        "./mymodule"
        "github.com/yuin/gopher-lua"
    )

    func main() {
        L := lua.NewState()
        defer L.Close()
        L.PreloadModule("mymodule", mymodule.Loader)
        if err := L.DoFile("main.lua"); err != nil {
            panic(err)
        }
    }

main.lua

.. code-block:: lua

    local m = require("mymodule")
    m.myfunc()
    print(m.name)


+++++++++++++++++++++++++++++++++++++++++
Calling Lua from Go
+++++++++++++++++++++++++++++++++++++++++

.. code-block:: go

   L := lua.NewState()
   defer L.Close()
   if err := L.DoFile("double.lua"); err != nil {
       panic(err)
   }
   if err := L.CallByParam(lua.P{
       Fn: L.GetGlobal("double"),
       NRet: 1,
       Protect: true,
       }, lua.LNumber(10)); err != nil {
       panic(err)
   }
   ret := L.Get(-1) // returned value
   L.Pop(1)  // remove received value

If ``Protect`` is false, GopherLua will panic instead of returning an ``error`` value.

+++++++++++++++++++++++++++++++++++++++++
User-Defined types
+++++++++++++++++++++++++++++++++++++++++
You can extend GopherLua with new types written in Go.
``LUserData`` is provided for this purpose.

.. code-block:: go

    type Person struct {
        Name string
    }

    const luaPersonTypeName = "person"

    // Registers my person type to given L.
    func registerPersonType(L *lua.LState) {
        mt := L.NewTypeMetatable(luaPersonTypeName)
        L.SetGlobal("person", mt)
        // static attributes
        L.SetField(mt, "new", L.NewFunction(newPerson))
        // methods
        L.SetField(mt, "__index", L.SetFuncs(L.NewTable(), personMethods))
    }

    // Constructor
    func newPerson(L *lua.LState) int {
        person := &Person{L.CheckString(1)}
        ud := L.NewUserData()
        ud.Value = person
        L.SetMetatable(ud, L.GetTypeMetatable(luaPersonTypeName))
        L.Push(ud)
        return 1
    }

    // Checks whether the first lua argument is a *LUserData with *Person and returns this *Person.
    func checkPerson(L *lua.LState) *Person {
        ud := L.CheckUserData(1)
        if v, ok := ud.Value.(*Person); ok {
            return v
        }
        L.ArgError(1, "person expected")
        return nil
    }

    var personMethods = map[string]lua.LGFunction{
        "name": personGetSetName,
    }

    // Getter and setter for the Person#Name
    func personGetSetName(L *lua.LState) int {
        p := checkPerson(L)
        if L.GetTop() == 2 {
            p.Name = L.CheckString(2)
            return 0
        }
        L.Push(lua.LString(p.Name))
        return 1
    }

    func main() {
        L := lua.NewState()
        defer L.Close()
        registerPersonType(L)
        if err := L.DoString(`
            p = person.new("Steeve")
            print(p:name()) -- "Steeve"
            p:name("Alice")
            print(p:name()) -- "Alice"
        `); err != nil {
            panic(err)
        }
    }

+++++++++++++++++++++++++++++++++++++++++
Goroutines
+++++++++++++++++++++++++++++++++++++++++
The ``LState`` is not goroutine-safe. It is recommended to use one LState per goroutine and communicate between goroutines by using channels.

Channels are represented by ``channel`` objects in GopherLua. And a ``channel`` table provides functions for performing channel operations.

Some objects can not be sent over channels due to having non-goroutine-safe objects inside itself.

- a thread(state)
- a function
- an userdata
- a table with a metatable

You **must not** send these objects from Go APIs to channels.



.. code-block:: go

    func receiver(ch, quit chan lua.LValue) {
        L := lua.NewState()
        defer L.Close()
        L.SetGlobal("ch", lua.LChannel(ch))
        L.SetGlobal("quit", lua.LChannel(quit))
        if err := L.DoString(`
        local exit = false
        while not exit do
          channel.select(
            {"|<-", ch, function(ok, v)
              if not ok then
                print("channel closed")
                exit = true
              else
                print("received:", v)
              end
            end},
            {"|<-", quit, function(ok, v)
                print("quit")
                exit = true
            end}
          )
        end
      `); err != nil {
            panic(err)
        }
    }

    func sender(ch, quit chan lua.LValue) {
        L := lua.NewState()
        defer L.Close()
        L.SetGlobal("ch", lua.LChannel(ch))
        L.SetGlobal("quit", lua.LChannel(quit))
        if err := L.DoString(`
        ch:send("1")
        ch:send("2")
      `); err != nil {
            panic(err)
        }
        ch <- lua.LString("3")
        quit <- lua.LTrue
    }

    func main() {
        ch := make(chan lua.LValue)
        quit := make(chan lua.LValue)
        go receiver(ch, quit)
        go sender(ch, quit)
        time.Sleep(3 * time.Second)
    }

'''''''''''''''
Go API
'''''''''''''''

``ToChannel``, ``CheckChannel``, ``OptChannel`` are available.

Refer to `Go doc(LState methods) <http://godoc.org/github.com/yuin/gopher-lua>`_ for further information.

'''''''''''''''
Lua API
'''''''''''''''

- **channel.make([buf:int]) -> ch:channel**
    - Create new channel that has a buffer size of ``buf``. By default, ``buf`` is 0.

- **channel.select(case:table [, case:table, case:table ...]) -> {index:int, recv:any, ok}**
    - Same as the ``select`` statement in Go. It returns the index of the chosen case and, if that
      case was a receive operation, the value received and a boolean indicating whether the channel has been closed.
    - ``case`` is a table that outlined below.
        - receiving: `{"|<-", ch:channel [, handler:func(ok, data:any)]}`
        - sending: `{"<-|", ch:channel, data:any [, handler:func(data:any)]}`
        - default: `{"default" [, handler:func()]}`

``channel.select`` examples:

.. code-block:: lua

    local idx, recv, ok = channel.select(
      {"|<-", ch1},
      {"|<-", ch2}
    )
    if not ok then
        print("closed")
    elseif idx == 1 then -- received from ch1
        print(recv)
    elseif idx == 2 then -- received from ch2
        print(recv)
    end

.. code-block:: lua

    channel.select(
      {"|<-", ch1, function(ok, data)
        print(ok, data)
      end},
      {"<-|", ch2, "value", function(data)
        print(data)
      end},
      {"default", function()
        print("default action")
      end}
    )

- **channel:send(data:any)**
    - Send ``data`` over the channel.
- **channel:receive() -> ok:bool, data:any**
    - Receive some data over the channel.
- **channel:close()**
    - Close the channel.

''''''''''''''''''''''''''''''
The LState pool pattern
''''''''''''''''''''''''''''''
To create per-thread LState instances, You can use the ``sync.Pool`` like mechanism.

.. code-block:: go

    type lStatePool struct {
        m     sync.Mutex
        saved []*lua.LState
    }

    func (pl *lStatePool) Get() *lua.LState {
        pl.m.Lock()
        defer pl.m.Unlock()
        n := len(pl.saved)
        if n == 0 {
            return pl.New()
        }
        x := pl.saved[n-1]
        pl.saved = pl.saved[0 : n-1]
        return x
    }

    func (pl *lStatePool) New() *lua.LState {
        L := lua.NewState()
        // setting the L up here.
        // load scripts, set global variables, share channels, etc...
        return L
    }

    func (pl *lStatePool) Put(L *lua.LState) {
        pl.m.Lock()
        defer pl.m.Unlock()
        pl.saved = append(pl.saved, L)
    }

    func (pl *lStatePool) Shutdown() {
        for _, L := range pl.saved {
            L.Close()
        }
    }

    // Global LState pool
    var luaPool = &lStatePool{
        saved: make([]*lua.LState, 0, 4),
    }

Now, you can get per-thread LState objects from the ``luaPool`` .

.. code-block:: go

    func MyWorker() {
       L := luaPool.Get()
       defer luaPool.Put(L)
       /* your code here */
    }

    func main() {
        defer luaPool.Shutdown()
        go MyWorker()
        go MyWorker()
        /* etc... */
    }


----------------------------------------------------------------
Differences between Lua and GopherLua
----------------------------------------------------------------
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Goroutines
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

- GopherLua supports channel operations.
    - GopherLua has a type named ``channel``.
    - The ``channel`` table provides functions for performing channel operations.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Unsupported functions
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

- ``string.dump``
- ``os.setlocale``
- ``lua_Debug.namewhat``
- ``package.loadlib``
- debug hooks

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Miscellaneous notes
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

- ``collectgarbage`` does not take any arguments and runs the garbage collector for the entire Go program.
- ``file:setvbuf`` does not support a line buffering.
- Daylight saving time is not supported.
- GopherLua has a function to set an environment variable : ``os.setenv(name, value)``

----------------------------------------------------------------
Standalone interpreter
----------------------------------------------------------------
Lua has an interpreter called ``lua`` . GopherLua has an interpreter called ``glua`` .

.. code-block:: bash

   go get github.com/yuin/gopher-lua/cmd/glua

``glua`` has same options as ``lua`` .

----------------------------------------------------------------
How to Contribute
----------------------------------------------------------------
See `Guidlines for contributors <https://github.com/yuin/gopher-lua/tree/master/.github/CONTRIBUTING.md>`_ .

----------------------------------------------------------------
Libraries for GopherLua
----------------------------------------------------------------

- `gopher-luar <https://github.com/layeh/gopher-luar>`_ : Custom type reflection for gopher-lua
- `gluamapper <https://github.com/yuin/gluamapper>`_ : Mapping a Lua table to a Go struct
- `gluare <https://github.com/yuin/gluare>`_ : Regular expressions for gopher-lua
- `gluahttp <https://github.com/cjoudrey/gluahttp>`_ : HTTP request module for gopher-lua
- `gopher-json <https://github.com/layeh/gopher-json>`_ : A simple JSON encoder/decoder for gopher-lua
- `gluayaml <https://github.com/kohkimakimoto/gluayaml>`_ : Yaml parser for gopher-lua
- `glua-lfs <https://github.com/layeh/gopher-lfs>`_ : Partially implements the luafilesystem module for gopher-lua
- `gluaurl <https://github.com/cjoudrey/gluaurl>`_ : A url parser/builder module for gopher-lua
- `gluahttpscrape <https://github.com/felipejfc/gluahttpscrape>`_ : A simple HTML scraper module for gopher-lua

----------------------------------------------------------------
Donation
----------------------------------------------------------------

BTC: 1NEDSyUmo4SMTDP83JJQSWi1MvQUGGNMZB

----------------------------------------------------------------
License
----------------------------------------------------------------
MIT

----------------------------------------------------------------
Author
----------------------------------------------------------------
Yusuke Inuzuka

Documentation

Overview

GopherLua: VM and compiler for Lua in Go

Index

Constants

View Source 
const (
	VarArgHasArg   uint8 = 1
	VarArgIsVarArg uint8 = 2
	VarArgNeedsArg uint8 = 4
)
View Source 
const (
	// BaseLibName is here for consistency; the base functions have no namespace/library.
	BaseLibName = ""
	// LoadLibName is here for consistency; the loading system has no namespace/library.
	LoadLibName = "package"
	// TabLibName is the name of the table Library.
	TabLibName = "table"
	// IoLibName is the name of the io Library.
	IoLibName = "io"
	// OsLibName is the name of the os Library.
	OsLibName = "os"
	// StringLibName is the name of the string Library.
	StringLibName = "string"
	// MathLibName is the name of the math Library.
	MathLibName = "math"
	// DebugLibName is the name of the debug Library.
	DebugLibName = "debug"
	// ChannelLibName is the name of the channel Library.
	ChannelLibName = "channel"
	// CoroutineLibName is the name of the coroutine Library.
	CoroutineLibName = "coroutine"
)
View Source 
const (
	OP_MOVE     int = iota /*      A B     R(A) := R(B)                            */
	OP_MOVEN               /*      A B     R(A) := R(B); followed by R(C) MOVE ops */
	OP_LOADK               /*     A Bx    R(A) := Kst(Bx)                          */
	OP_LOADBOOL            /*  A B C   R(A) := (Bool)B; if (C) pc++                */
	OP_LOADNIL             /*   A B     R(A) := ... := R(B) := nil                 */
	OP_GETUPVAL            /*  A B     R(A) := UpValue[B]                          */

	OP_GETGLOBAL  /* A Bx    R(A) := Gbl[Kst(Bx)]                            */
	OP_GETTABLE   /*  A B C   R(A) := R(B)[RK(C)]                             */
	OP_GETTABLEKS /*  A B C   R(A) := R(B)[RK(C)] ; RK(C) is constant string */

	OP_SETGLOBAL  /* A Bx    Gbl[Kst(Bx)] := R(A)                            */
	OP_SETUPVAL   /*  A B     UpValue[B] := R(A)                              */
	OP_SETTABLE   /*  A B C   R(A)[RK(B)] := RK(C)                            */
	OP_SETTABLEKS /*  A B C   R(A)[RK(B)] := RK(C) ; RK(B) is constant string */

	OP_NEWTABLE /*  A B C   R(A) := {} (size = BC)                         */

	OP_SELF /*      A B C   R(A+1) := R(B); R(A) := R(B)[RK(C)]             */

	OP_ADD /*       A B C   R(A) := RK(B) + RK(C)                           */
	OP_SUB /*       A B C   R(A) := RK(B) - RK(C)                           */
	OP_MUL /*       A B C   R(A) := RK(B) * RK(C)                           */
	OP_DIV /*       A B C   R(A) := RK(B) / RK(C)                           */
	OP_MOD /*       A B C   R(A) := RK(B) % RK(C)                           */
	OP_POW /*       A B C   R(A) := RK(B) ^ RK(C)                           */
	OP_UNM /*       A B     R(A) := -R(B)                                   */
	OP_NOT /*       A B     R(A) := not R(B)                                */
	OP_LEN /*       A B     R(A) := length of R(B)                          */

	OP_CONCAT /*    A B C   R(A) := R(B).. ... ..R(C)                       */

	OP_JMP /*       sBx     pc+=sBx                                 */

	OP_EQ /*        A B C   if ((RK(B) == RK(C)) ~= A) then pc++            */
	OP_LT /*        A B C   if ((RK(B) <  RK(C)) ~= A) then pc++            */
	OP_LE /*        A B C   if ((RK(B) <= RK(C)) ~= A) then pc++            */

	OP_TEST    /*      A C     if not (R(A) <=> C) then pc++                   */
	OP_TESTSET /*   A B C   if (R(B) <=> C) then R(A) := R(B) else pc++     */

	OP_CALL     /*      A B C   R(A) ... R(A+C-2) := R(A)(R(A+1) ... R(A+B-1)) */
	OP_TAILCALL /*  A B C   return R(A)(R(A+1) ... R(A+B-1))              */
	OP_RETURN   /*    A B     return R(A) ... R(A+B-2)      (see note)      */

	OP_FORLOOP /*   A sBx   R(A)+=R(A+2);
	     if R(A) <?= R(A+1) then { pc+=sBx; R(A+3)=R(A) }*/
	OP_FORPREP /*   A sBx   R(A)-=R(A+2); pc+=sBx                           */

	OP_TFORLOOP /*  A C     R(A+3) ... R(A+3+C) := R(A)(R(A+1) R(A+2));
	    if R(A+3) ~= nil then { pc++; R(A+2)=R(A+3); }  */
	OP_SETLIST /*   A B C   R(A)[(C-1)*FPF+i] := R(A+i) 1 <= i <= B        */

	OP_CLOSE   /*     A       close all variables in the stack up to (>=) R(A)*/
	OP_CLOSURE /*   A Bx    R(A) := closure(KPROTO[Bx] R(A) ... R(A+n))  */

	OP_VARARG /*     A B     R(A) R(A+1) ... R(A+B-1) = vararg            */

	OP_NOP /* NOP */
)
View Source 
const EnvironIndex = -10001
View Source 
const GlobalsIndex = -10002
View Source 
const LNumberBit = 64
View Source 
const LNumberScanFormat = "%f"
View Source 
const MultRet = -1
View Source 
const PackageAuthors = "Yusuke Inuzuka"
View Source 
const PackageCopyRight = PackageName + " " + PackageVersion + " Copyright (C) 2015 " + PackageAuthors
View Source 
const PackageName = "GopherLua"
View Source 
const PackageVersion = "0.1"
View Source 
const RegistryIndex = -10000

Variables

View Source 
var CallStackSize = 256
View Source 
var CompatVarArg = true
View Source 
var FieldsPerFlush = 50
View Source 
var LFalse = LBool(false)
View Source 
var LNil = LValue(&LNilType{})
View Source 
var LTrue = LBool(true)
View Source 
var LuaLDir string
View Source 
var LuaOS string
View Source 
var LuaPath = "LUA_PATH"
View Source 
var LuaPathDefault string
View Source 
var MaxArrayIndex = 67108864
View Source 
var MaxTableGetLoop = 100
View Source 
var RegistrySize = 256 * 20

Functions

func LVAsBool 

func LVAsBool(v LValue) bool

LVIsFalse returns false if a given LValue is a nil or false otherwise true.

func LVAsString 

func LVAsString(v LValue) string

LVAsString returns string representation of a given LValue if the LValue is a string or number, otherwise an empty string.

func LVCanConvToString 

func LVCanConvToString(v LValue) bool

LVCanConvToString returns true if a given LValue is a string or number otherwise false.

func LVIsFalse 

func LVIsFalse(v LValue) bool

LVIsFalse returns true if a given LValue is a nil or false otherwise false.

func OpenBase 

func OpenBase(L *LState) int

func OpenChannel 

func OpenChannel(L *LState) int

func OpenCoroutine 

func OpenCoroutine(L *LState) int

func OpenDebug 

func OpenDebug(L *LState) int

func OpenIo 

func OpenIo(L *LState) int

func OpenMath 

func OpenMath(L *LState) int

func OpenOs 

func OpenOs(L *LState) int

func OpenPackage 

func OpenPackage(L *LState) int

func OpenString 

func OpenString(L *LState) int

func OpenTable 

func OpenTable(L *LState) int

func UpvalueIndex 

func UpvalueIndex(i int) int

Types

type ApiError 

type ApiError struct {
	Type       ApiErrorType
	Object     LValue
	StackTrace string
	// Underlying error. This attribute is set only if the Type is ApiErrorFile or ApiErrorSyntax
	Cause error
}

func (*ApiError) Error 

func (e *ApiError) Error() string

type ApiErrorType 

type ApiErrorType int
const (
	ApiErrorSyntax ApiErrorType = iota
	ApiErrorFile
	ApiErrorRun
	ApiErrorError
	ApiErrorPanic
)

type CompileError 

type CompileError struct {
	Context *funcContext
	Line    int
	Message string
}

func (*CompileError) Error 

func (e *CompileError) Error() string

type DbgCall 

type DbgCall struct {
	Name string
	Pc   int
}

type DbgLocalInfo 

type DbgLocalInfo struct {
	Name    string
	StartPc int
	EndPc   int
}

type Debug 

type Debug struct {
	Name            string
	What            string
	Source          string
	CurrentLine     int
	NUpvalues       int
	LineDefined     int
	LastLineDefined int
	// contains filtered or unexported fields
}

type FunctionProto 

type FunctionProto struct {
	SourceName         string
	LineDefined        int
	LastLineDefined    int
	NumUpvalues        uint8
	NumParameters      uint8
	IsVarArg           uint8
	NumUsedRegisters   uint8
	Code               []uint32
	Constants          []LValue
	FunctionPrototypes []*FunctionProto

	DbgSourcePositions []int
	DbgLocals          []*DbgLocalInfo
	DbgCalls           []DbgCall
	DbgUpvalues        []string
	// contains filtered or unexported fields
}

func Compile 

func Compile(chunk []ast.Stmt, name string) (proto *FunctionProto, err error)

func (*FunctionProto) String 

func (fp *FunctionProto) String() string

type Global 

type Global struct {
	MainThread    *LState
	CurrentThread *LState
	Registry      *LTable
	Global        *LTable
	// contains filtered or unexported fields
}

type LBool 

type LBool bool

func (LBool) String 

func (bl LBool) String() string

func (LBool) Type 

func (bl LBool) Type() LValueType

type LChannel 

type LChannel chan LValue

func (LChannel) String 

func (ch LChannel) String() string

func (LChannel) Type 

func (ch LChannel) Type() LValueType

type LFunction 

type LFunction struct {
	IsG       bool
	Env       *LTable
	Proto     *FunctionProto
	GFunction LGFunction
	Upvalues  []*Upvalue
}

func (*LFunction) LocalName 

func (fn *LFunction) LocalName(regno, pc int) (string, bool)

func (*LFunction) String 

func (fn *LFunction) String() string

func (*LFunction) Type 

func (fn *LFunction) Type() LValueType

type LGFunction 

type LGFunction func(*LState) int

type LNilType 

type LNilType struct{}

func (*LNilType) String 

func (nl *LNilType) String() string

func (*LNilType) Type 

func (nl *LNilType) Type() LValueType

type LNumber 

type LNumber float64

func LVAsNumber 

func LVAsNumber(v LValue) LNumber

LVAsNumber tries to convert a given LValue to a number.

func (LNumber) Format 

func (nm LNumber) Format(f fmt.State, c rune)

fmt.Formatter interface

func (LNumber) String 

func (nm LNumber) String() string

func (LNumber) Type 

func (nm LNumber) Type() LValueType

type LState 

type LState struct {
	G       *Global
	Parent  *LState
	Env     *LTable
	Panic   func(*LState)
	Dead    bool
	Options Options
	// contains filtered or unexported fields
}

func NewState 

func NewState(opts ...Options) *LState

func (*LState) ArgError 

func (ls *LState) ArgError(n int, message string)

func (*LState) Call 

func (ls *LState) Call(nargs, nret int)

func (*LState) CallByParam 

func (ls *LState) CallByParam(cp P, args ...LValue) error

func (*LState) CallMeta 

func (ls *LState) CallMeta(obj LValue, event string) LValue

func (*LState) CheckAny 

func (ls *LState) CheckAny(n int) LValue

func (*LState) CheckBool 

func (ls *LState) CheckBool(n int) bool

func (*LState) CheckChannel 

func (ls *LState) CheckChannel(n int) chan LValue

Checks whether the given index is an LChannel and returns this channel.

func (*LState) CheckFunction 

func (ls *LState) CheckFunction(n int) *LFunction

func (*LState) CheckInt 

func (ls *LState) CheckInt(n int) int

func (*LState) CheckInt64 

func (ls *LState) CheckInt64(n int) int64

func (*LState) CheckNumber 

func (ls *LState) CheckNumber(n int) LNumber

func (*LState) CheckOption 

func (ls *LState) CheckOption(n int, options []string) int

func (*LState) CheckString 

func (ls *LState) CheckString(n int) string

func (*LState) CheckTable 

func (ls *LState) CheckTable(n int) *LTable

func (*LState) CheckThread 

func (ls *LState) CheckThread(n int) *LState

func (*LState) CheckType 

func (ls *LState) CheckType(n int, typ LValueType)

func (*LState) CheckTypes 

func (ls *LState) CheckTypes(n int, typs ...LValueType)

func (*LState) CheckUserData 

func (ls *LState) CheckUserData(n int) *LUserData

func (*LState) Close 

func (ls *LState) Close()

func (*LState) Concat 

func (ls *LState) Concat(values ...LValue) string

func (*LState) CreateTable 

func (ls *LState) CreateTable(acap, hcap int) *LTable

func (*LState) DoFile 

func (ls *LState) DoFile(path string) error

func (*LState) DoString 

func (ls *LState) DoString(source string) error

func (*LState) Equal 

func (ls *LState) Equal(lhs, rhs LValue) bool

func (*LState) Error 

func (ls *LState) Error(lv LValue, level int)

This function is equivalent to lua_error( http://www.lua.org/manual/5.1/manual.html#lua_error ).

func (*LState) FindTable 

func (ls *LState) FindTable(obj *LTable, n string, size int) LValue

func (*LState) ForEach 

func (ls *LState) ForEach(tb *LTable, cb func(LValue, LValue))

func (*LState) GPCall 

func (ls *LState) GPCall(fn LGFunction, data LValue) error

func (*LState) Get 

func (ls *LState) Get(idx int) LValue

func (*LState) GetFEnv 

func (ls *LState) GetFEnv(obj LValue) LValue

func (*LState) GetField 

func (ls *LState) GetField(obj LValue, skey string) LValue

func (*LState) GetGlobal 

func (ls *LState) GetGlobal(name string) LValue

func (*LState) GetInfo 

func (ls *LState) GetInfo(what string, dbg *Debug, fn LValue) (LValue, error)

func (*LState) GetLocal 

func (ls *LState) GetLocal(dbg *Debug, no int) (string, LValue)

func (*LState) GetMetaField 

func (ls *LState) GetMetaField(obj LValue, event string) LValue

func (*LState) GetMetatable 

func (ls *LState) GetMetatable(obj LValue) LValue

func (*LState) GetStack 

func (ls *LState) GetStack(level int) (*Debug, bool)

func (*LState) GetTable 

func (ls *LState) GetTable(obj LValue, key LValue) LValue

func (*LState) GetTop 

func (ls *LState) GetTop() int

func (*LState) GetTypeMetatable 

func (ls *LState) GetTypeMetatable(typ string) LValue

func (*LState) GetUpvalue 

func (ls *LState) GetUpvalue(fn *LFunction, no int) (string, LValue)

func (*LState) Insert 

func (ls *LState) Insert(value LValue, index int)

func (*LState) LessThan 

func (ls *LState) LessThan(lhs, rhs LValue) bool

func (*LState) Load 

func (ls *LState) Load(reader io.Reader, name string) (*LFunction, error)

func (*LState) LoadFile 

func (ls *LState) LoadFile(path string) (*LFunction, error)

func (*LState) LoadString 

func (ls *LState) LoadString(source string) (*LFunction, error)

func (*LState) NewClosure 

func (ls *LState) NewClosure(fn LGFunction, upvalues ...LValue) *LFunction

func (*LState) NewFunction 

func (ls *LState) NewFunction(fn LGFunction) *LFunction

func (*LState) NewTable 

func (ls *LState) NewTable() *LTable

func (*LState) NewThread 

func (ls *LState) NewThread() *LState

func (*LState) NewTypeMetatable 

func (ls *LState) NewTypeMetatable(typ string) *LTable

func (*LState) NewUserData 

func (ls *LState) NewUserData() *LUserData

func (*LState) Next 

func (ls *LState) Next(tb *LTable, key LValue) (LValue, LValue)

func (*LState) ObjLen 

func (ls *LState) ObjLen(v1 LValue) int

func (*LState) OpenLibs 

func (ls *LState) OpenLibs()

OpenLibs loads the built-in libraries. It is equivalent to running OpenLoad, then OpenBase, then iterating over the other OpenXXX functions in any order.

func (*LState) OptBool 

func (ls *LState) OptBool(n int, d bool) bool

func (*LState) OptChannel 

func (ls *LState) OptChannel(n int, ch chan LValue) chan LValue

If the given index is a LChannel, returns this channel. If this argument is absent or is nil, returns ch. Otherwise, raises an error.

func (*LState) OptFunction 

func (ls *LState) OptFunction(n int, d *LFunction) *LFunction

func (*LState) OptInt 

func (ls *LState) OptInt(n int, d int) int

func (*LState) OptInt64 

func (ls *LState) OptInt64(n int, d int64) int64

func (*LState) OptNumber 

func (ls *LState) OptNumber(n int, d LNumber) LNumber

func (*LState) OptString 

func (ls *LState) OptString(n int, d string) string

func (*LState) OptTable 

func (ls *LState) OptTable(n int, d *LTable) *LTable

func (*LState) OptUserData 

func (ls *LState) OptUserData(n int, d *LUserData) *LUserData

func (*LState) PCall 

func (ls *LState) PCall(nargs, nret int, errfunc *LFunction) (err error)

func (*LState) Pop 

func (ls *LState) Pop(n int)

func (*LState) PreloadModule 

func (ls *LState) PreloadModule(name string, loader LGFunction)

Set a module loader to the package.preload table.

func (*LState) Push 

func (ls *LState) Push(value LValue)

func (*LState) RaiseError 

func (ls *LState) RaiseError(format string, args ...interface{})

This function is equivalent to luaL_error( http://www.lua.org/manual/5.1/manual.html#luaL_error ).

func (*LState) RawEqual 

func (ls *LState) RawEqual(lhs, rhs LValue) bool

func (*LState) RawGet 

func (ls *LState) RawGet(tb *LTable, key LValue) LValue

func (*LState) RawGetInt 

func (ls *LState) RawGetInt(tb *LTable, key int) LValue

func (*LState) RawSet 

func (ls *LState) RawSet(tb *LTable, key LValue, value LValue)

func (*LState) RawSetInt 

func (ls *LState) RawSetInt(tb *LTable, key int, value LValue)

func (*LState) Register 

func (ls *LState) Register(name string, fn LGFunction)

func (*LState) RegisterModule 

func (ls *LState) RegisterModule(name string, funcs map[string]LGFunction) LValue

func (*LState) Remove 

func (ls *LState) Remove(index int)

func (*LState) Replace 

func (ls *LState) Replace(idx int, value LValue)

func (*LState) Resume 

func (ls *LState) Resume(th *LState, fn *LFunction, args ...LValue) (ResumeState, error, []LValue)

func (*LState) SetFEnv 

func (ls *LState) SetFEnv(obj LValue, env LValue)

func (*LState) SetField 

func (ls *LState) SetField(obj LValue, key string, value LValue)

func (*LState) SetFuncs 

func (ls *LState) SetFuncs(tb *LTable, funcs map[string]LGFunction, upvalues ...LValue) *LTable

func (*LState) SetGlobal 

func (ls *LState) SetGlobal(name string, value LValue)

func (*LState) SetLocal 

func (ls *LState) SetLocal(dbg *Debug, no int, lv LValue) string

func (*LState) SetMetatable 

func (ls *LState) SetMetatable(obj LValue, mt LValue)

func (*LState) SetMx 

func (ls *LState) SetMx(mx int)

Set maximum memory size. This function can only be called from the main thread.

func (*LState) SetTable 

func (ls *LState) SetTable(obj LValue, key LValue, value LValue)

func (*LState) SetTop 

func (ls *LState) SetTop(idx int)

func (*LState) SetUpvalue 

func (ls *LState) SetUpvalue(fn *LFunction, no int, lv LValue) string

func (*LState) Status 

func (ls *LState) Status(th *LState) string

func (*LState) String 

func (ls *LState) String() string

func (*LState) ToBool 

func (ls *LState) ToBool(n int) bool

func (*LState) ToChannel 

func (ls *LState) ToChannel(n int) chan LValue

Converts the Lua value at the given acceptable index to the chan LValue.

func (*LState) ToFunction 

func (ls *LState) ToFunction(n int) *LFunction

func (*LState) ToInt 

func (ls *LState) ToInt(n int) int

func (*LState) ToInt64 

func (ls *LState) ToInt64(n int) int64

func (*LState) ToNumber 

func (ls *LState) ToNumber(n int) LNumber

func (*LState) ToString 

func (ls *LState) ToString(n int) string

func (*LState) ToStringMeta 

func (ls *LState) ToStringMeta(lv LValue) LValue

ToStringMeta returns string representation of given LValue. This method calls the `__tostring` meta method if defined.

func (*LState) ToTable 

func (ls *LState) ToTable(n int) *LTable

func (*LState) ToThread 

func (ls *LState) ToThread(n int) *LState

func (*LState) ToUserData 

func (ls *LState) ToUserData(n int) *LUserData

func (*LState) Type 

func (ls *LState) Type() LValueType

func (*LState) TypeError 

func (ls *LState) TypeError(n int, typ LValueType)

func (*LState) Where 

func (ls *LState) Where(level int) string

func (*LState) XMoveTo 

func (ls *LState) XMoveTo(other *LState, n int)

func (*LState) Yield 

func (ls *LState) Yield(values ...LValue) int

type LString 

type LString string

func (LString) Format 

func (st LString) Format(f fmt.State, c rune)

fmt.Formatter interface

func (LString) String 

func (st LString) String() string

func (LString) Type 

func (st LString) Type() LValueType

type LTable 

type LTable struct {
	Metatable LValue
	// contains filtered or unexported fields
}

func (*LTable) Append 

func (tb *LTable) Append(value LValue)

Append appends a given LValue to this LTable.

func (*LTable) ForEach 

func (tb *LTable) ForEach(cb func(LValue, LValue))

ForEach iterates over this table of elements, yielding each in turn to a given function.

func (*LTable) Insert 

func (tb *LTable) Insert(i int, value LValue)

Insert inserts a given LValue at position `i` in this table.

func (*LTable) Len 

func (tb *LTable) Len() int

Len returns length of this LTable.

func (*LTable) MaxN 

func (tb *LTable) MaxN() int

MaxN returns a maximum number key that nil value does not exist before it.

func (*LTable) Next 

func (tb *LTable) Next(key LValue) (LValue, LValue)

This function is equivalent to lua_next ( http://www.lua.org/manual/5.1/manual.html#lua_next ).

func (*LTable) RawGet 

func (tb *LTable) RawGet(key LValue) LValue

RawGet returns an LValue associated with a given key without __index metamethod.

func (*LTable) RawGetH 

func (tb *LTable) RawGetH(key LValue) LValue

RawGet returns an LValue associated with a given key without __index metamethod.

func (*LTable) RawGetInt 

func (tb *LTable) RawGetInt(key int) LValue

RawGetInt returns an LValue at position `key` without __index metamethod.

func (*LTable) RawGetString 

func (tb *LTable) RawGetString(key string) LValue

RawGetString returns an LValue associated with a given key without __index metamethod.

func (*LTable) RawSet 

func (tb *LTable) RawSet(key LValue, value LValue)

RawSet sets a given LValue to a given index without the __newindex metamethod. It is recommended to use `RawSetString` or `RawSetInt` for performance if you already know the given LValue is a string or number.

func (*LTable) RawSetH 

func (tb *LTable) RawSetH(key LValue, value LValue)

RawSetH sets a given LValue to a given index without the __newindex metamethod.

func (*LTable) RawSetInt 

func (tb *LTable) RawSetInt(key int, value LValue)

RawSetInt sets a given LValue at a position `key` without the __newindex metamethod.

func (*LTable) RawSetString 

func (tb *LTable) RawSetString(key string, value LValue)

RawSetString sets a given LValue to a given string index without the __newindex metamethod.

func (*LTable) Remove 

func (tb *LTable) Remove(pos int) LValue

Remove removes from this table the element at a given position.

func (*LTable) String 

func (tb *LTable) String() string

func (*LTable) Type 

func (tb *LTable) Type() LValueType

type LUserData 

type LUserData struct {
	Value     interface{}
	Env       *LTable
	Metatable LValue
}

func (*LUserData) String 

func (ud *LUserData) String() string

func (*LUserData) Type 

func (ud *LUserData) Type() LValueType

type LValue 

type LValue interface {
	String() string
	Type() LValueType
	// contains filtered or unexported methods
}

type LValueType 

type LValueType int
const (
	LTNil LValueType = iota
	LTBool
	LTNumber
	LTString
	LTFunction
	LTUserData
	LTThread
	LTTable
	LTChannel
)

func (LValueType) String 

func (vt LValueType) String() string

type Options 

type Options struct {
	// Call stack size. This defaults to `lua.CallStackSize`.
	CallStackSize int
	// Data stack size. This defaults to `lua.RegistrySize`.
	RegistrySize int
	// Controls whether or not libraries are opened by default
	SkipOpenLibs bool
	// Tells whether a Go stacktrace should be included in a Lua stacktrace when panics occur.
	IncludeGoStackTrace bool
	// A Context that can be used to stop the Lua VM.
	Context context.Context
}

Options is a configuration that is used to create a new LState.

type P 

type P struct {
	Fn      LValue
	NRet    int
	Protect bool
	Handler *LFunction
}

type ResumeState 

type ResumeState int
const (
	ResumeOK ResumeState = iota
	ResumeYield
	ResumeError
)

type Upvalue 

type Upvalue struct {
	// contains filtered or unexported fields
}

func (*Upvalue) Close 

func (uv *Upvalue) Close()

func (*Upvalue) IsClosed 

func (uv *Upvalue) IsClosed() bool

func (*Upvalue) SetValue 

func (uv *Upvalue) SetValue(value LValue)

func (*Upvalue) Value 

func (uv *Upvalue) Value() LValue

Source Files

View all Source files

Directories

Path Synopsis
cmd
glua
Lua pattern match functions for Go
 Lua pattern match functions for Go

Jump to

Keyboard shortcuts

? : This menu
/ : Search site
f or F : Jump to
y or Y : Canonical URL
go.dev uses cookies from Google to deliver and enhance the quality of its services and to analyze traffic. Learn more.