diff --git a/src/main/java/com/anatawa12/fixRtm/FixRtm.kt b/src/main/java/com/anatawa12/fixRtm/FixRtm.kt
index 728b6aed..fa6dbda5 100644
--- a/src/main/java/com/anatawa12/fixRtm/FixRtm.kt
+++ b/src/main/java/com/anatawa12/fixRtm/FixRtm.kt
@@ -7,7 +7,7 @@ import com.anatawa12.fixRtm.network.NetworkHandler
 import com.anatawa12.fixRtm.rtm.modelpack.modelset.dummies.*
 import com.anatawa12.fixRtm.scripting.loadFIXScriptUtil
 import com.anatawa12.fixRtm.scripting.nashorn.CompiledImportedScriptCache
-import com.anatawa12.fixRtm.scripting.rhino.ExecutedScriptCache
+import com.anatawa12.fixRtm.scripting.sai.ExecutedScriptCache
 import jp.ngt.ngtlib.NGTCore
 import jp.ngt.rtm.RTMCore
 import net.minecraft.block.Block
@@ -45,7 +45,7 @@ object FixRtm {
     fun construct(e: FMLConstructionEvent) {
         FIXFileLoader.load() // init
         when (MainConfig.scriptingMode) {
-            MainConfig.ScriptingMode.CacheWithRhino -> {
+            MainConfig.ScriptingMode.CacheWithSai -> {
                 loadFIXScriptUtil()// init
                 ExecutedScriptCache.load()// init
             }
diff --git a/src/main/java/com/anatawa12/fixRtm/asm/config/MainConfig.kt b/src/main/java/com/anatawa12/fixRtm/asm/config/MainConfig.kt
index 2fe04c17..fbecc479 100644
--- a/src/main/java/com/anatawa12/fixRtm/asm/config/MainConfig.kt
+++ b/src/main/java/com/anatawa12/fixRtm/asm/config/MainConfig.kt
@@ -30,7 +30,7 @@ object MainConfig {
             "scriptingMode", categoryModelLoading,
             "use-default",
             "scripting mode. the value is one of the list below:\n" +
-                    "cache-with-rhino    : the fastest mode but not stable. some script may make error.\n" +
+                    "cache-with-sai      : the fastest mode but not stable. some script may make error.\n" +
                     "better-with-nashorn : same runtime as RTM but a little faster than RTM.\n" +
                     "use-rtm-normal      : same as RTM. this is the slowest mode.\n" +
                     "use-default         : use default mode. currently use-rtm-normal.\n")
@@ -95,14 +95,16 @@ object MainConfig {
         }
     }
 
-    enum class ScriptingMode(val configValue: String) {
-        CacheWithRhino("cache-with-rhino"),
+    enum class ScriptingMode(vararg val configValues: String) {
+        CacheWithSai("cache-with-sai", "cache-with-rhino"),
         BetterWithNashorn("better-with-nashorn"),
         UseRtmNormal("use-rtm-normal"),
         ;
 
         companion object {
-            private val byConfigValue = values().associateBy { it.configValue }
+            private val byConfigValue = values()
+                .flatMap { it.configValues.map { k -> k to it } }
+                .toMap()
 
             fun getByConfigValue(value: String) = byConfigValue[value]
 
diff --git a/src/main/java/com/anatawa12/fixRtm/scripting/ExecutedScript.kt b/src/main/java/com/anatawa12/fixRtm/scripting/ExecutedScript.kt
index 1bf8d052..40c92f98 100644
--- a/src/main/java/com/anatawa12/fixRtm/scripting/ExecutedScript.kt
+++ b/src/main/java/com/anatawa12/fixRtm/scripting/ExecutedScript.kt
@@ -2,10 +2,10 @@ package com.anatawa12.fixRtm.scripting
 
 import com.anatawa12.fixRtm.Loggers
 import com.anatawa12.fixRtm.caching.TaggedFileManager
-import org.mozilla.javascript.Scriptable
-import org.mozilla.javascript.ScriptableObject
-import org.mozilla.javascript.serialize.ScriptableInputStream
-import org.mozilla.javascript.serialize.ScriptableOutputStream
+import com.anatawa12.sai.Scriptable
+import com.anatawa12.sai.ScriptableObject
+import com.anatawa12.sai.serialize.ScriptableInputStream
+import com.anatawa12.sai.serialize.ScriptableOutputStream
 import java.io.*
 
 class ExecutedScript private constructor(
@@ -16,9 +16,9 @@ class ExecutedScript private constructor(
         val scopeData: ByteArray?
 ) {
     constructor(
-            dependencies: Map<String, ByteArray>,
-            scope: ScriptableObject,
-            base: Scriptable
+        dependencies: Map<String, ByteArray>,
+        scope: ScriptableObject,
+        base: Scriptable
     ): this(
             dependencies, writeScopeData(scope, base)
     ) {
diff --git a/src/main/java/com/anatawa12/fixRtm/scripting/FIXScriptUtil.kt b/src/main/java/com/anatawa12/fixRtm/scripting/FIXScriptUtil.kt
index b8964d8a..10eb00b5 100644
--- a/src/main/java/com/anatawa12/fixRtm/scripting/FIXScriptUtil.kt
+++ b/src/main/java/com/anatawa12/fixRtm/scripting/FIXScriptUtil.kt
@@ -5,13 +5,13 @@ package com.anatawa12.fixRtm.scripting
 import com.anatawa12.fixRtm.asm.config.MainConfig
 import com.anatawa12.fixRtm.io.FIXFileLoader
 import com.anatawa12.fixRtm.scripting.nashorn.NashornScriptRuntimeImpl
-import com.anatawa12.fixRtm.scripting.rhino.RhinoScriptRuntimeImpl
+import com.anatawa12.fixRtm.scripting.sai.SaiScriptRuntimeImpl
 import jp.ngt.rtm.modelpack.ModelPackManager
 import net.minecraft.util.ResourceLocation
 import javax.script.ScriptEngine
 
 val scriptRuntime: IScriptRuntime<*, *> = when (MainConfig.scriptingMode) {
-    MainConfig.ScriptingMode.CacheWithRhino -> RhinoScriptRuntimeImpl
+    MainConfig.ScriptingMode.CacheWithSai -> SaiScriptRuntimeImpl
     MainConfig.ScriptingMode.BetterWithNashorn -> NashornScriptRuntimeImpl
     MainConfig.ScriptingMode.UseRtmNormal -> IScriptRuntime.AssertingRuntime
 }
diff --git a/src/main/java/com/anatawa12/fixRtm/scripting/ScriptImporter.kt b/src/main/java/com/anatawa12/fixRtm/scripting/ScriptImporter.kt
index 0da925ad..28eb3806 100644
--- a/src/main/java/com/anatawa12/fixRtm/scripting/ScriptImporter.kt
+++ b/src/main/java/com/anatawa12/fixRtm/scripting/ScriptImporter.kt
@@ -1,8 +1,8 @@
 package com.anatawa12.fixRtm.scripting
 
 import com.anatawa12.fixRtm.io.FIXFileLoader
+import com.anatawa12.sai.ScriptRuntime
 import net.minecraft.util.ResourceLocation
-import org.mozilla.javascript.ScriptRuntime
 import java.util.concurrent.ConcurrentHashMap
 
 
diff --git a/src/main/java/com/anatawa12/fixRtm/scripting/rhino/FIXRhinoScriptEngine.kt b/src/main/java/com/anatawa12/fixRtm/scripting/sai/FIXSaiScriptEngine.kt
similarity index 92%
rename from src/main/java/com/anatawa12/fixRtm/scripting/rhino/FIXRhinoScriptEngine.kt
rename to src/main/java/com/anatawa12/fixRtm/scripting/sai/FIXSaiScriptEngine.kt
index b86b98f6..71c76d51 100644
--- a/src/main/java/com/anatawa12/fixRtm/scripting/rhino/FIXRhinoScriptEngine.kt
+++ b/src/main/java/com/anatawa12/fixRtm/scripting/sai/FIXSaiScriptEngine.kt
@@ -1,11 +1,11 @@
-package com.anatawa12.fixRtm.scripting.rhino
+package com.anatawa12.fixRtm.scripting.sai
 
-import org.mozilla.javascript.Function
-import org.mozilla.javascript.ScriptableObject
+import com.anatawa12.sai.Function
+import com.anatawa12.sai.ScriptableObject
 import java.io.Reader
 import javax.script.*
 
-class FIXRhinoScriptEngine : ScriptEngine, Invocable {
+class FIXSaiScriptEngine : ScriptEngine, Invocable {
     lateinit var scope: ScriptableObject
 
     override fun createBindings(): Bindings {
diff --git a/src/main/java/com/anatawa12/fixRtm/scripting/rhino/ImportScriptRhinoFunctionImpl.kt b/src/main/java/com/anatawa12/fixRtm/scripting/sai/ImportScriptSaiFunctionImpl.kt
similarity index 86%
rename from src/main/java/com/anatawa12/fixRtm/scripting/rhino/ImportScriptRhinoFunctionImpl.kt
rename to src/main/java/com/anatawa12/fixRtm/scripting/sai/ImportScriptSaiFunctionImpl.kt
index a73c129c..fd622065 100644
--- a/src/main/java/com/anatawa12/fixRtm/scripting/rhino/ImportScriptRhinoFunctionImpl.kt
+++ b/src/main/java/com/anatawa12/fixRtm/scripting/sai/ImportScriptSaiFunctionImpl.kt
@@ -1,13 +1,13 @@
-package com.anatawa12.fixRtm.scripting.rhino
+package com.anatawa12.fixRtm.scripting.sai
 
 import com.anatawa12.fixRtm.io.FIXFileLoader
 import com.anatawa12.fixRtm.io.FIXModelPack
 import com.anatawa12.fixRtm.scripting.ScriptImporter
+import com.anatawa12.sai.*
 import net.minecraft.util.ResourceLocation
-import org.mozilla.javascript.*
 
 
-object ImportScriptRhinoFunctionImpl : BaseFunction() {
+object ImportScriptSaiFunctionImpl : BaseFunction() {
     fun getScript(name: String): Script {
         val resourceLocation = ResourceLocation(name)
         val resource = FIXFileLoader.getResource(resourceLocation)
@@ -41,8 +41,8 @@ object ImportScriptRhinoFunctionImpl : BaseFunction() {
     fun init(scope: ScriptableObject) {
         usingContext { cx ->
             scope.defineProperty(
-                    ImportScriptRhinoFunctionImpl.functionName,
-                    ImportScriptRhinoFunctionImpl,
+                    ImportScriptSaiFunctionImpl.functionName,
+                    ImportScriptSaiFunctionImpl,
                     ScriptableObject.READONLY or ScriptableObject.DONTENUM
             )
         }
diff --git a/src/main/java/com/anatawa12/fixRtm/scripting/rhino/RhinoScriptRuntimeImpl.kt b/src/main/java/com/anatawa12/fixRtm/scripting/sai/SaiScriptRuntimeImpl.kt
similarity index 84%
rename from src/main/java/com/anatawa12/fixRtm/scripting/rhino/RhinoScriptRuntimeImpl.kt
rename to src/main/java/com/anatawa12/fixRtm/scripting/sai/SaiScriptRuntimeImpl.kt
index 4667413d..2880642b 100644
--- a/src/main/java/com/anatawa12/fixRtm/scripting/rhino/RhinoScriptRuntimeImpl.kt
+++ b/src/main/java/com/anatawa12/fixRtm/scripting/sai/SaiScriptRuntimeImpl.kt
@@ -1,4 +1,4 @@
-package com.anatawa12.fixRtm.scripting.rhino
+package com.anatawa12.fixRtm.scripting.sai
 
 import com.anatawa12.fixRtm.caching.ModelPackBasedCache
 import com.anatawa12.fixRtm.fixCacheDir
@@ -7,24 +7,24 @@ import com.anatawa12.fixRtm.io.FIXResource
 import com.anatawa12.fixRtm.scripting.ExecutedScript
 import com.anatawa12.fixRtm.scripting.IScriptRuntime
 import com.anatawa12.fixRtm.utils.DigestUtils
+import com.anatawa12.sai.ImporterTopLevel
+import com.anatawa12.sai.Script
+import com.anatawa12.sai.ScriptableObject
+import com.anatawa12.sai.TopLevel
 import net.minecraft.util.ResourceLocation
-import org.mozilla.javascript.ImporterTopLevel
-import org.mozilla.javascript.Script
-import org.mozilla.javascript.ScriptableObject
-import org.mozilla.javascript.TopLevel
 
-object RhinoScriptRuntimeImpl : IScriptRuntime<Script, FIXRhinoScriptEngine> {
-    override fun getCachedEngine(filePath: ResourceLocation, resource: FIXResource, dependencies: Map<ResourceLocation, String>): FIXRhinoScriptEngine? {
+object SaiScriptRuntimeImpl : IScriptRuntime<Script, FIXSaiScriptEngine> {
+    override fun getCachedEngine(filePath: ResourceLocation, resource: FIXResource, dependencies: Map<ResourceLocation, String>): FIXSaiScriptEngine? {
         return getScriptAndDoScriptByCache(filePath, resource.pack, makeDependenciesData(dependencies))
-                ?.let { scope -> FIXRhinoScriptEngine().also { it.scope = scope } }
+                ?.let { scope -> FIXSaiScriptEngine().also { it.scope = scope } }
     }
 
-    override fun compile(script: String, fileName: String, engine: FIXRhinoScriptEngine?): Script =usingContext { cx ->
+    override fun compile(script: String, fileName: String, engine: FIXSaiScriptEngine?): Script =usingContext { cx ->
         return ScriptCompiledClassCache.compile(script, fileName)
     }
 
-    override fun exec(script: Script): FIXRhinoScriptEngine {
-        val engine = FIXRhinoScriptEngine()
+    override fun exec(script: Script): FIXSaiScriptEngine {
+        val engine = FIXSaiScriptEngine()
         usingContext { cx ->
             val scope = makeNewScope()
 
@@ -36,7 +36,7 @@ object RhinoScriptRuntimeImpl : IScriptRuntime<Script, FIXRhinoScriptEngine> {
         return engine
     }
 
-    override fun cache(pack: FIXModelPack, filePath: ResourceLocation, dependencies: Map<ResourceLocation, String>, engine: FIXRhinoScriptEngine) {
+    override fun cache(pack: FIXModelPack, filePath: ResourceLocation, dependencies: Map<ResourceLocation, String>, engine: FIXSaiScriptEngine) {
         ExecutedScriptCache.add(pack, filePath, makeExecutedScript(makeDependenciesData(dependencies), engine.scope))
     }
 
@@ -45,7 +45,7 @@ object RhinoScriptRuntimeImpl : IScriptRuntime<Script, FIXRhinoScriptEngine> {
 
         it.initStandardObjects(scope)
 
-        ImportScriptRhinoFunctionImpl.init(scope)
+        ImportScriptSaiFunctionImpl.init(scope)
 
         scope.sealObject()
 
diff --git a/src/main/java/com/anatawa12/fixRtm/scripting/rhino/ScriptCompiledClassCache.kt b/src/main/java/com/anatawa12/fixRtm/scripting/sai/ScriptCompiledClassCache.kt
similarity index 93%
rename from src/main/java/com/anatawa12/fixRtm/scripting/rhino/ScriptCompiledClassCache.kt
rename to src/main/java/com/anatawa12/fixRtm/scripting/sai/ScriptCompiledClassCache.kt
index aac83af5..a9210b26 100644
--- a/src/main/java/com/anatawa12/fixRtm/scripting/rhino/ScriptCompiledClassCache.kt
+++ b/src/main/java/com/anatawa12/fixRtm/scripting/sai/ScriptCompiledClassCache.kt
@@ -1,14 +1,14 @@
-package com.anatawa12.fixRtm.scripting.rhino
+package com.anatawa12.fixRtm.scripting.sai
 
 import com.anatawa12.fixRtm.Loggers
 import com.anatawa12.fixRtm.fixCacheDir
 import com.anatawa12.fixRtm.mkParent
 import com.anatawa12.fixRtm.utils.DigestUtils
-import org.mozilla.javascript.CompilerEnvirons
-import org.mozilla.javascript.Context
-import org.mozilla.javascript.Script
-import org.mozilla.javascript.optimizer.ClassCompiler
-import org.mozilla.javascript.tools.ToolErrorReporter
+import com.anatawa12.sai.CompilerEnvirons
+import com.anatawa12.sai.Context
+import com.anatawa12.sai.Script
+import com.anatawa12.sai.optimizer.ClassCompiler
+import com.anatawa12.sai.tools.ToolErrorReporter
 import java.io.IOException
 import java.util.*
 import java.util.concurrent.ConcurrentHashMap
diff --git a/src/main/java/com/anatawa12/fixRtm/scripting/rhino/Util.kt b/src/main/java/com/anatawa12/fixRtm/scripting/sai/Util.kt
similarity index 68%
rename from src/main/java/com/anatawa12/fixRtm/scripting/rhino/Util.kt
rename to src/main/java/com/anatawa12/fixRtm/scripting/sai/Util.kt
index 3acada86..f22d49d0 100644
--- a/src/main/java/com/anatawa12/fixRtm/scripting/rhino/Util.kt
+++ b/src/main/java/com/anatawa12/fixRtm/scripting/sai/Util.kt
@@ -1,7 +1,6 @@
-package com.anatawa12.fixRtm.scripting.rhino
-
-import org.mozilla.javascript.Context
+package com.anatawa12.fixRtm.scripting.sai
 
+import com.anatawa12.sai.Context
 
 inline fun <T> usingContext(script: (Context) -> T): T{
     val context = Context.enter()