Add google-endpoints to third_party/.

third_party/google-endpoints/libfuturize/fixes/fix_division_safe.py

+"""
+For the ``future`` package.
+
+Adds this import line:
+
+    from __future__ import division
+
+at the top and changes any old-style divisions to be calls to
+past.utils.old_div so the code runs as before on Py2.6/2.7 and has the same
+behaviour on Py3.
+
+If "from __future__ import division" is already in effect, this fixer does
+nothing.
+"""
+
+from lib2to3 import fixer_base
+from lib2to3.fixer_util import syms, does_tree_import
+from libfuturize.fixer_util import (token, future_import, touch_import_top,
+                                    wrap_in_fn_call)
+
+
+def match_division(node):
+    u"""
+    __future__.division redefines the meaning of a single slash for division,
+    so we match that and only that.
+    """
+    slash = token.SLASH
+    return node.type == slash and not node.next_sibling.type == slash and \
+                                  not node.prev_sibling.type == slash
+
+
+class FixDivisionSafe(fixer_base.BaseFix):
+    # BM_compatible = True
+    run_order = 4    # this seems to be ignored?
+
+    _accept_type = token.SLASH
+
+    PATTERN = """
+    term<(not('/') any)+ '/' ((not('/') any))>
+    """
+
+    def start_tree(self, tree, name):
+        """
+        Skip this fixer if "__future__.division" is already imported.
+        """
+        super(FixDivisionSafe, self).start_tree(tree, name)
+        self.skip = "division" in tree.future_features
+
+    def match(self, node):
+        u"""
+        Since the tree needs to be fixed once and only once if and only if it
+        matches, we can start discarding matches after the first.
+        """
+        if (node.type == self.syms.term and 
+                    len(node.children) == 3 and
+                    match_division(node.children[1])):
+            expr1, expr2 = node.children[0], node.children[2]
+            return expr1, expr2
+        else:
+            return False
+
+    def transform(self, node, results):
+        if self.skip:
+            return
+        future_import(u"division", node)
+
+        touch_import_top(u'past.utils', u'old_div', node)
+        expr1, expr2 = results[0].clone(), results[1].clone()
+        # Strip any leading space for the first number:
+        expr1.prefix = u''
+        return wrap_in_fn_call("old_div", (expr1, expr2), prefix=node.prefix)
+