Adding cython v0.20.2 in third-party.

third_party/cython/src/Tools/cython-epydoc.py

Index: third_party/cython/src/Tools/cython-epydoc.py
diff --git a/third_party/cython/src/Tools/cython-epydoc.py b/third_party/cython/src/Tools/cython-epydoc.py
new file mode 100644
index 0000000000000000000000000000000000000000..66e74019e19a3ead04a919feb7346b60ba2dbd21
--- /dev/null
+++ b/third_party/cython/src/Tools/cython-epydoc.py
@@ -0,0 +1,45 @@
+#! /usr/bin/env python
+
+# --------------------------------------------------------------------
+
+import re
+from epydoc import docstringparser as dsp
+
+CYTHON_SIGNATURE_RE = re.compile(
+    # Class name (for builtin methods)
+    r'^\s*((?P<class>\w+)\.)?' +
+    # The function name
+    r'(?P<func>\w+)' +
+    # The parameters
+    r'\(((?P<self>(?:self|cls|mcs)),?)?(?P<params>.*)\)' +
+    # The return value (optional)
+    r'(\s*(->)\s*(?P<return>\w+(?:\s*\w+)))?' +
+    # The end marker
+    r'\s*(?:\n|$)')
+
+parse_signature = dsp.parse_function_signature
+
+def parse_function_signature(func_doc, doc_source,
+                             docformat, parse_errors):
+    PYTHON_SIGNATURE_RE = dsp._SIGNATURE_RE
+    assert PYTHON_SIGNATURE_RE is not CYTHON_SIGNATURE_RE
+    try:
+        dsp._SIGNATURE_RE = CYTHON_SIGNATURE_RE
+        found = parse_signature(func_doc, doc_source,
+                                docformat, parse_errors)
+        dsp._SIGNATURE_RE = PYTHON_SIGNATURE_RE
+        if not found:
+            found = parse_signature(func_doc, doc_source,
+                                    docformat, parse_errors)
+        return found
+    finally:
+        dsp._SIGNATURE_RE = PYTHON_SIGNATURE_RE
+
+dsp.parse_function_signature = parse_function_signature
+
+# --------------------------------------------------------------------
+
+from epydoc.cli import cli
+cli()
+
+# --------------------------------------------------------------------