Imported from /home/lorry/working-area/delta_boost-tarball/boost_1_54_0.tar.bz2.boost_1_54_0baserock/morph

1 files changed, 87 insertions, 0 deletions

diff --git a/libs/python/pyste/src/Pyste/exporterutils.py b/libs/python/pyste/src/Pyste/exporterutils.py
new file mode 100644
index 000000000..363700d2b
--- /dev/null
+++ b/libs/python/pyste/src/Pyste/exporterutils.py
@@ -0,0 +1,87 @@
+# Copyright Bruno da Silva de Oliveira 2003. Use, modification and 
+# distribution is subject to the Boost Software License, Version 1.0.
+# (See accompanying file LICENSE_1_0.txt or copy at 
+# http://www.boost.org/LICENSE_1_0.txt)
+
+'''
+Various helpers for interface files.
+'''
+
+from settings import *
+from policies import *
+from declarations import *
+
+#==============================================================================
+# FunctionWrapper
+#==============================================================================
+class FunctionWrapper(object): 
+    '''Holds information about a wrapper for a function or a method. It is
+    divided in 2 parts: the name of the Wrapper, and its code.  The code is
+    placed in the declaration section of the module, while the name is used to
+    def' the function or method (with the pyste namespace prepend to it). If
+    code is None, the name is left unchanged.
+    '''
+
+    def __init__(self, name, code=None):
+        self.name = name
+        self.code = code
+
+    def FullName(self):
+        if self.code:
+            return namespaces.pyste + self.name
+        else:
+            return self.name
+
+
+_printed_warnings = {} # used to avoid double-prints of warnings
+
+#==============================================================================
+# HandlePolicy
+#==============================================================================
+def HandlePolicy(function, policy):
+    '''Show a warning to the user if the function needs a policy and doesn't
+    have one. Return a policy to the function, which is the given policy itself
+    if it is not None, or a default policy for this method.
+    '''
+    
+    def IsString(type):
+        'Return True if the Type instance can be considered a string'
+        return type.FullName() == 'const char*'
+
+    def IsPyObject(type):
+        return type.FullName() == '_object *' # internal name of PyObject
+    
+    result = function.result
+    # if the function returns const char*, a policy is not needed
+    if IsString(result) or IsPyObject(result):
+        return policy
+    # if returns a const T&, set the default policy
+    if policy is None and result.const and isinstance(result, ReferenceType):
+        policy = return_value_policy(copy_const_reference)
+    # basic test if the result type demands a policy
+    needs_policy = isinstance(result, (ReferenceType, PointerType)) 
+    # show a warning to the user, if needed
+    if needs_policy and policy is None:
+        global _printed_warnings
+        warning = '---> Error: %s returns a pointer or a reference, ' \
+                  'but no policy was specified.' % function.FullName()
+        if warning not in _printed_warnings:
+            print warning
+            print 
+            # avoid double prints of the same warning
+            _printed_warnings[warning] = 1
+    return policy
+            
+
+#==============================================================================
+# EspecializeTypeID
+#==============================================================================
+_exported_type_ids = {}
+def EspecializeTypeID(typename):
+    global _exported_type_ids
+    macro = 'BOOST_PYTHON_OPAQUE_SPECIALIZED_TYPE_ID(%s)\n' % typename
+    if macro not in _exported_type_ids:
+        _exported_type_ids[macro] = 1
+        return macro
+    else:
+        return None