1 files changed, 87 insertions, 0 deletions
diff --git a/module/JsEngine.py b/module/JsEngine.py
new file mode 100644
index 000000000..ca5bfe4fc
--- /dev/null
+++ b/module/JsEngine.py
@@ -0,0 +1,87 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+"""
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 3 of the License,
+    or (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+    See the GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, see <http://www.gnu.org/licenses/>.
+
+    @author: RaNaN
+"""
+
+ENGINE = ""
+
+try:
+    import spidermonkey
+    ENGINE = "spidermonkey"
+except:
+    pass
+
+if not ENGINE:
+    try:
+        import PyV8
+        ENGINE = "pyv8"
+    except:
+        pass
+
+if not ENGINE:
+    try:
+        import subprocess
+        subprocess.Popen(["js", "-v"], bufsize=-1,stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+        ENGINE = "js"
+    except:
+        pass
+
+class JsEngine():
+    def __init__(self):
+        self.engine = ENGINE
+
+    def __nonzero__(self):
+        return False if not ENGINE else True
+
+    def eval(self, script):
+        if not ENGINE:
+            raise Exception("No JS Engine")
+        elif ENGINE == "spidermonkey":
+            return self.eval_spidermonkey(script)
+        elif ENGINE == "pyv8":
+            return self.eval_pyv8(script)
+        elif ENGINE == "js":
+            return self.eval_js(script)
+
+
+    def eval_spidermonkey(self, script):
+        rt = spidermonkey.Runtime()
+        cx = rt.new_context()
+        return cx.execute(script)
+
+    def eval_pyv8(self, script):
+        rt = PyV8.JSContext()
+        rt.enter()
+        return rt.eval(script)
+
+    def eval_js(self, script):
+        script = "print(eval('%s'))" % script.replace("'",'"')
+        p = subprocess.Popen(["js", "-e", script], stdout=subprocess.PIPE, stderr=subprocess.STDOUT, bufsize=-1)
+        res = p.stdout.read().strip()
+        return res
+
+if __name__ == "__main__":
+    js = JsEngine()
+    import subprocess
+    import spidermonkey
+    import PyV8
+
+    test = '"a"+"b"'
+
+    print js.eval_js(test)
+    print js.eval_spidermonkey(test)
+    print js.eval_pyv8(test)
+\ No newline at end of file