forked from heroiclabs/nakama
/
runtime_lua_loadlib.go
125 lines (110 loc) · 3.54 KB
/
runtime_lua_loadlib.go
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// The MIT License (MIT)
//
// Copyright (c) 2015 Yusuke Inuzuka
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
package server
import (
"bytes"
"fmt"
"github.com/yuin/gopher-lua"
"os"
"path/filepath"
"strings"
)
const emptyLString lua.LString = lua.LString("")
func loGetPath(env string, defpath string) string {
path := os.Getenv(env)
if len(path) == 0 {
path = defpath
}
path = strings.Replace(path, ";;", ";"+defpath+";", -1)
if os.PathSeparator != '/' {
dir, err := filepath.Abs(filepath.Dir(os.Args[0]))
if err != nil {
panic(err)
}
path = strings.Replace(path, "!", dir, -1)
}
return path
}
func OpenPackage(moduleCache *RuntimeLuaModuleCache) func(L *lua.LState) int {
return func(L *lua.LState) int {
loLoaderCache := func(L *lua.LState) int {
name := L.CheckString(1)
module, ok := moduleCache.Modules[name]
if !ok {
L.Push(lua.LString(fmt.Sprintf("no cached module '%s'", name)))
return 1
}
fn, err := L.Load(bytes.NewReader(module.Content), module.Path)
if err != nil {
L.RaiseError(err.Error())
}
L.Push(fn)
return 1
}
packagemod := L.RegisterModule(lua.LoadLibName, loFuncs)
L.SetField(packagemod, "preload", L.NewTable())
loaders := L.CreateTable(2, 0)
L.RawSetInt(loaders, 1, L.NewFunction(loLoaderPreload))
L.RawSetInt(loaders, 2, L.NewFunction(loLoaderCache))
L.SetField(packagemod, "loaders", loaders)
L.SetField(L.Get(lua.RegistryIndex), "_LOADERS", loaders)
loaded := L.NewTable()
L.SetField(packagemod, "loaded", loaded)
L.SetField(L.Get(lua.RegistryIndex), "_LOADED", loaded)
L.SetField(packagemod, "path", lua.LString(loGetPath(lua.LuaPath, lua.LuaPathDefault)))
L.SetField(packagemod, "cpath", emptyLString)
L.Push(packagemod)
return 1
}
}
var loFuncs = map[string]lua.LGFunction{
"loadlib": loLoadLib,
"seeall": loSeeAll,
}
func loLoaderPreload(L *lua.LState) int {
name := L.CheckString(1)
preload := L.GetField(L.GetField(L.Get(lua.EnvironIndex), "package"), "preload")
if _, ok := preload.(*lua.LTable); !ok {
L.RaiseError("package.preload must be a table")
}
lv := L.GetField(preload, name)
if lv == lua.LNil {
L.Push(lua.LString(fmt.Sprintf("no field package.preload['%s']", name)))
return 1
}
L.Push(lv)
return 1
}
func loLoadLib(L *lua.LState) int {
L.RaiseError("loadlib is not supported")
return 0
}
func loSeeAll(L *lua.LState) int {
mod := L.CheckTable(1)
mt := L.GetMetatable(mod)
if mt == lua.LNil {
mt = L.CreateTable(0, 1)
L.SetMetatable(mod, mt)
}
L.SetField(mt, "__index", L.Get(lua.GlobalsIndex))
return 0
}