diff --git a/crossplane/__init__.py b/crossplane/__init__.py
index 0fc08a5..e8951c7 100644
--- a/crossplane/__init__.py
+++ b/crossplane/__init__.py
@@ -4,6 +4,7 @@
 from .builder import build
 from .formatter import format
 from .ext.lua import LuaBlockPlugin
+from .ext.by_lua import LuaPlugin
 
 __all__ = ['parse', 'lex', 'build', 'format']
 
@@ -19,6 +20,6 @@
 __license__ = 'Apache 2.0'
 __copyright__ = 'Copyright 2018 NGINX, Inc.'
 
-default_enabled_extensions = [LuaBlockPlugin()]
+default_enabled_extensions = [LuaBlockPlugin(), LuaPlugin()]
 for extension in default_enabled_extensions:
     extension.register_extension()
diff --git a/crossplane/ext/by_lua.py b/crossplane/ext/by_lua.py
new file mode 100644
index 0000000..89c1aca
--- /dev/null
+++ b/crossplane/ext/by_lua.py
@@ -0,0 +1,36 @@
+# -*- coding: utf-8 -*-
+from crossplane.analyzer import register_external_directives
+from crossplane.builder import register_external_builder
+from crossplane.ext.abstract import CrossplaneExtension
+
+
+class LuaPlugin(CrossplaneExtension):
+    directives = {
+        'init_by_lua': [],
+        'init_worker_by_lua': [],
+        'set_by_lua': [],
+        'rewrite_by_lua': [],
+        'access_by_lua': [],
+        'content_by_lua': [],
+        'header_filter_by_lua': [],
+        'body_filter_by_lua': [],
+        'log_by_lua': [],
+    }
+
+    def register_extension(self):
+        register_external_builder(directives=self.directives, builder=self.build)
+
+    def lex(self, token_iterator, directive):
+        raise NotImplementedError
+
+    def parse(self, stmt, parsing, tokens, ctx=(), consume=False):
+        raise NotImplementedError
+
+    def build(self, stmt, padding, state, indent=4, tabs=False):
+        built = stmt['directive']
+        if built == 'set_by_lua':
+            block = stmt['args'][1]
+            built += " %s" % stmt['args'][0]
+        else:
+            block = stmt['args'][0]
+        return built + " '" + block + "';"