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load.go
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load.go
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package lua
import (
"fmt"
"os"
"path/filepath"
"strings"
"github.com/Shopify/go-lua"
)
const (
pathListSeparator = ';'
defaultPath = "./?.lua"
)
func findLoader(l *lua.State, name string) {
var msg string
if l.Field(lua.UpValueIndex(1), "searchers"); !l.IsTable(3) {
lua.Errorf(l, "'package.searchers' must be a table")
}
for i := 1; ; i++ {
if l.RawGetInt(3, i); l.IsNil(-1) {
l.Pop(1)
l.PushString(msg)
lua.Errorf(l, "module '%s' not found: %s", name, msg)
}
l.PushString(name)
if l.Call(1, 2); l.IsFunction(-2) {
return
} else if l.IsString(-2) {
msg += lua.CheckString(l, -2)
}
l.Pop(2)
}
}
func searcherPreload(l *lua.State) int {
name := lua.CheckString(l, 1)
l.Field(lua.RegistryIndex, "_PRELOAD")
l.Field(-1, name)
if l.IsNil(-1) {
l.PushString(fmt.Sprintf("\n\tno field package.preload['%s']", name))
}
return 1
}
func createSearchersTable(l *lua.State) {
searchers := []lua.Function{searcherPreload}
l.CreateTable(len(searchers), 0)
for i, s := range searchers {
l.PushValue(-2)
l.PushGoClosure(s, 1)
l.RawSetInt(-2, i+1)
}
}
func noEnv(l *lua.State) bool {
l.Field(lua.RegistryIndex, "LUA_NOENV")
b := l.ToBoolean(-1)
l.Pop(1)
return b
}
func setPath(l *lua.State, field, env, def string) {
if path := os.Getenv(env); path == "" || noEnv(l) {
l.PushString(def)
} else {
o := fmt.Sprintf("%c%c", pathListSeparator, pathListSeparator)
n := fmt.Sprintf("%c%s%c", pathListSeparator, def, pathListSeparator)
path = strings.ReplaceAll(path, o, n)
l.PushString(path)
}
l.SetField(-2, field)
}
var packageLibrary = []lua.RegistryFunction{
{Name: "loadlib", Function: func(l *lua.State) int {
_ = lua.CheckString(l, 1) // path
_ = lua.CheckString(l, 2) // init
l.PushNil()
l.PushString("dynamic libraries not enabled; check your Lua installation")
l.PushString("absent")
return 3 // Return nil, error message, and where.
}},
{Name: "searchpath", Function: func(l *lua.State) int {
_ = lua.CheckString(l, 1)
_ = lua.CheckString(l, 2)
_ = lua.OptString(l, 3, ".")
_ = lua.OptString(l, 4, string(filepath.Separator))
l.PushNil()
l.PushString("searchpath not enabled; check your Lua installation")
l.PushString("absent")
return 3 // Return nil, error message, and where.
}},
}
// PackageOpen opens the package library. Usually passed to Require.
func PackageOpen(l *lua.State) int {
lua.NewLibrary(l, packageLibrary)
createSearchersTable(l)
l.SetField(-2, "searchers")
setPath(l, "path", "LUA_PATH", defaultPath)
l.PushString(fmt.Sprintf("%c\n%c\n?\n!\n-\n", filepath.Separator, pathListSeparator))
l.SetField(-2, "config")
lua.SubTable(l, lua.RegistryIndex, "_LOADED")
l.SetField(-2, "loaded")
lua.SubTable(l, lua.RegistryIndex, "_PRELOAD")
l.SetField(-2, "preload")
l.PushGlobalTable()
l.PushValue(-2)
lua.SetFunctions(l, []lua.RegistryFunction{
{Name: "require", Function: func(l *lua.State) int {
name := lua.CheckString(l, 1)
l.SetTop(1)
l.Field(lua.RegistryIndex, "_LOADED")
l.Field(2, name)
if l.ToBoolean(-1) {
return 1
}
l.Pop(1)
findLoader(l, name)
l.PushString(name)
l.Insert(-2)
l.Call(2, 1)
if !l.IsNil(-1) {
l.SetField(2, name)
}
l.Field(2, name)
if l.IsNil(-1) {
l.PushBoolean(true)
l.PushValue(-1)
l.SetField(2, name)
}
return 1
}},
}, 1)
l.Pop(1)
return 1
}