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65 lines
2.4 KiB
Python
65 lines
2.4 KiB
Python
'''
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Various helpers for interface files.
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'''
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from settings import *
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from policies import *
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from declarations import *
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#==============================================================================
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# FunctionWrapper
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#==============================================================================
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class FunctionWrapper(object):
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'''Holds information about a wrapper for a function or a method. It is in 2
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parts: the name of the Wrapper, and its code. The code is placed in the
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declaration section of the module, while the name is used to def' the
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function or method (with the pyste namespace prepend to it). If code is None,
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the name is left unchanged.
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'''
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def __init__(self, name, code=None):
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self.name = name
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self.code = code
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def FullName(self):
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if self.code:
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return namespaces.pyste + self.name
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else:
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return self.name
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#==============================================================================
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# HandlePolicy
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#==============================================================================
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def HandlePolicy(function, policy):
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'''Show a warning to the user if the function needs a policy and doesn't
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have one. Return a policy to the function, which is the given policy itself
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if it is not None, or a default policy for this method.
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'''
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def IsString(type):
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'Return True if the Type instance can be considered a string'
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return type.const and type.name == 'char' and isinstance(type, PointerType)
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result = function.result
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# basic test if the result type demands a policy
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needs_policy = isinstance(result, (ReferenceType, PointerType))
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# if the function returns const char*, a policy is not needed
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if IsString(result):
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needs_policy = False
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# if returns a const T&, set the default policy
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if policy is None and result.const and isinstance(result, ReferenceType):
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policy = return_value_policy(copy_const_reference)
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# show a warning to the user, if needed
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if needs_policy and policy is None:
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global _printed_warnings
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warning = '---> Error: Method "%s" needs a policy.' % function.FullName()
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if warning not in _printed_warnings:
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print warning
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print
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# avoid double prints of the same warning
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_printed_warnings[warning] = 1
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return policy
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_printed_warnings = {} # used to avoid double-prints in HandlePolicy
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