1 files changed, 73 insertions, 0 deletions
diff --git a/paste/deploy/util.py b/paste/deploy/util.py
new file mode 100644
index 0000000..b6f766a
--- /dev/null
+++ b/paste/deploy/util.py
@@ -0,0 +1,73 @@
+# (c) 2005 Ian Bicking and contributors; written for Paste (http://pythonpaste.org)
+# Licensed under the MIT license: http://www.opensource.org/licenses/mit-license.php
+import inspect
+import sys
+
+from paste.deploy.compat import reraise
+
+
+def fix_type_error(exc_info, callable, varargs, kwargs):
+    """
+    Given an exception, this will test if the exception was due to a
+    signature error, and annotate the error with better information if
+    so.
+
+    Usage::
+
+      try:
+          val = callable(*args, **kw)
+      except TypeError:
+          exc_info = fix_type_error(None, callable, args, kw)
+          raise exc_info[0], exc_info[1], exc_info[2]
+    """
+    if exc_info is None:
+        exc_info = sys.exc_info()
+    if (exc_info[0] != TypeError
+        or str(exc_info[1]).find('arguments') == -1
+        or getattr(exc_info[1], '_type_error_fixed', False)):
+        return exc_info
+    exc_info[1]._type_error_fixed = True
+    argspec = inspect.formatargspec(*inspect.getargspec(callable))
+    args = ', '.join(map(_short_repr, varargs))
+    if kwargs and args:
+        args += ', '
+    if kwargs:
+        kwargs = sorted(kwargs.items())
+        args += ', '.join(['%s=...' % n for n, v in kwargs])
+    gotspec = '(%s)' % args
+    msg = '%s; got %s, wanted %s' % (exc_info[1], gotspec, argspec)
+    exc_info[1].args = (msg,)
+    return exc_info
+
+
+def _short_repr(v):
+    v = repr(v)
+    if len(v) > 12:
+        v = v[:8] + '...' + v[-4:]
+    return v
+
+
+def fix_call(callable, *args, **kw):
+    """
+    Call ``callable(*args, **kw)`` fixing any type errors that come out.
+    """
+    try:
+        val = callable(*args, **kw)
+    except TypeError:
+        exc_info = fix_type_error(None, callable, args, kw)
+        reraise(*exc_info)
+    return val
+
+
+def lookup_object(spec):
+    """
+    Looks up a module or object from a some.module:func_name specification.
+    To just look up a module, omit the colon and everything after it.
+    """
+    parts, target = spec.split(':') if ':' in spec else (spec, None)
+    module = __import__(parts)
+
+    for part in parts.split('.')[1:] + ([target] if target else []):
+        module = getattr(module, part)
+
+    return module