123 lines
2.7 KiB
Go
123 lines
2.7 KiB
Go
package lua
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import (
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"fmt"
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"os"
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"path/filepath"
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"strings"
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)
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/* load lib {{{ */
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var loLoaders = []LGFunction{loLoaderPreload, loLoaderLua}
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func loGetPath(env string, defpath string) string {
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path := os.Getenv(env)
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if len(path) == 0 {
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path = defpath
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}
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path = strings.Replace(path, ";;", ";"+defpath+";", -1)
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if os.PathSeparator != '/' {
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dir, err := filepath.Abs(filepath.Dir(os.Args[0]))
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if err != nil {
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panic(err)
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}
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path = strings.Replace(path, "!", dir, -1)
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}
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return path
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}
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func loFindFile(L *LState, name, pname string) (string, string) {
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name = strings.Replace(name, ".", string(os.PathSeparator), -1)
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lv := L.GetField(L.GetField(L.Get(EnvironIndex), "package"), pname)
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path, ok := lv.(LString)
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if !ok {
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L.RaiseError("package.%s must be a string", pname)
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}
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messages := []string{}
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for _, pattern := range strings.Split(string(path), ";") {
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luapath := strings.Replace(pattern, "?", name, -1)
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if _, err := os.Stat(luapath); err == nil {
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return luapath, ""
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} else {
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messages = append(messages, err.Error())
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}
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}
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return "", strings.Join(messages, "\n\t")
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}
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func loadOpen(L *LState) {
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packagemod := L.RegisterModule("package", loFuncs)
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L.SetField(packagemod, "preload", L.NewTable())
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loaders := L.CreateTable(len(loLoaders), 0)
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for i, loader := range loLoaders {
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L.RawSetInt(loaders, i+1, L.NewFunction(loader))
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}
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L.SetField(packagemod, "loaders", loaders)
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L.SetField(L.Get(RegistryIndex), "_LOADERS", loaders)
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loaded := L.NewTable()
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L.SetField(packagemod, "loaded", loaded)
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L.SetField(L.Get(RegistryIndex), "_LOADED", loaded)
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L.SetField(packagemod, "path", LString(loGetPath(LuaPath, LuaPathDefault)))
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L.SetField(packagemod, "cpath", LString(""))
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}
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var loFuncs = map[string]LGFunction{
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"loadlib": loLoadLib,
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"seeall": loSeeAll,
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}
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func loLoaderPreload(L *LState) int {
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name := L.CheckString(1)
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preload := L.GetField(L.GetField(L.Get(EnvironIndex), "package"), "preload")
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if _, ok := preload.(*LTable); !ok {
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L.RaiseError("package.preload must be a table")
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}
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lv := L.GetField(preload, name)
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if lv == LNil {
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L.Push(LString(fmt.Sprintf("no field package.preload['%s']", name)))
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return 1
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}
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L.Push(lv)
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return 1
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}
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func loLoaderLua(L *LState) int {
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name := L.CheckString(1)
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path, msg := loFindFile(L, name, "path")
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if len(path) == 0 {
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L.Push(LString(msg))
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return 1
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}
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fn, err1 := L.LoadFile(path)
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if err1 != nil {
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L.RaiseError(err1.Error())
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}
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L.Push(fn)
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return 1
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}
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func loLoadLib(L *LState) int {
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L.RaiseError("loadlib is not supported")
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return 0
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}
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func loSeeAll(L *LState) int {
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mod := L.CheckTable(1)
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mt := L.GetMetatable(mod)
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if mt == LNil {
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mt = L.CreateTable(0, 1)
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L.SetMetatable(mod, mt)
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}
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L.SetField(mt, "__index", L.Get(GlobalsIndex))
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return 0
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}
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/* }}} */
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//
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