Make react path overridable both at usage and in subclasses

Author: davidfischer-ch

README.md

@@ -32,6 +32,10 @@ for jsx_path, js_path in my_paths:
 
 # For a single file, you can use a shortcut method.
 jsx.transform('path/to/input/file.jsx', js_path='path/to/output/file.js')
+
+# You can also define the path to react.
+transformer = jsx.JSXTransformer('path/to/react')
+jsx.transform('path/to/input/file.jsx', js_path='path/to/output/file.js', react_path='...')
 ```
 
 You can also use ``transform_string(jsx)`` method to transform strings:

react/jsx.py

@@ -14,17 +14,20 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import os
+
 import execjs
-import react.source
 
 
 class JSXTransformer(object):
 
     JSX_TRANSFORMER_JS_EXPR = '(global.JSXTransformer || module.exports)'
+    react_path = os.path.abspath(os.path.join(__file__, 'js', 'react'))
 
-    def __init__(self):
-        path = react.source.path_for('JSXTransformer.js')
-        with open(path, 'rU') as f:
+    def __init__(self, react_path=None):
+        if react_path is not None:
+            self.react_path = react_path
+        with open(os.path.join(self.react_path, 'JSXTransformer.js'), 'rU') as f:
             self.context = execjs.compile(f.read())
 
     def transform_string(self, jsx, harmony=False, strip_types=False):
@@ -62,8 +65,10 @@ class TransformError(Exception):
 
 
 def transform(jsx_path, **opts):
-    return JSXTransformer().transform(jsx_path, **opts)
+    react_path = opts.pop('react_path', None)
+    return JSXTransformer(react_path=react_path).transform(jsx_path, **opts)
 
 
 def transform_string(jsx, **opts):
-    return JSXTransformer().transform_string(jsx, **opts)
+    react_path = opts.pop('react_path', None)
+    return JSXTransformer(react_path=react_path).transform_string(jsx, **opts)