declarations.py

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# 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)

'''
Defines classes that represent declarations found in C++ header files.
    
'''

# version indicates the version of the declarations. Whenever a declaration
# changes, this variable should be updated, so that the caches can be rebuilt
# automatically
version = '1.0'

#==============================================================================
# Declaration
#==============================================================================
class Declaration(object):
    '''Base class for all declarations.
    @ivar name: The name of the declaration.
    @ivar namespace: The namespace of the declaration.
    '''

    def __init__(self, name, namespace):
        '''
        @type name: string
        @param name: The name of this declaration
        @type namespace: string
        @param namespace: the full namespace where this declaration resides.
        '''
        self.name = name
        self.namespace = namespace
        self.location = '', -1  # (filename, line)
        self.incomplete = False
        self.is_unique = True


    def FullName(self):
        '''
        Returns the full qualified name: "boost::inner::Test"
        @rtype: string
        @return: The full name of the declaration.
        '''
        namespace = self.namespace or ''
        if namespace and not namespace.endswith('::'):
            namespace += '::'
        return namespace + self.name
    
    
    def __repr__(self):        
        return '<Declaration %s at %s>' % (self.FullName(), id(self))


    def __str__(self):
        return 'Declaration of %s' % self.FullName()
    
    
#==============================================================================
# Class
#==============================================================================
class Class(Declaration):
    '''
    Represents a C++ class or struct. Iteration through it yields its members.

    @type abstract: bool
    @ivar abstract: if the class has any abstract methods.

    @type bases: tuple
    @ivar bases: tuple with L{Base} instances, representing the most direct
    inheritance.

    @type hierarchy: list
    @ivar hierarchy: a list of tuples of L{Base} instances, representing
    the entire hierarchy tree of this object. The first tuple is the parent 
    classes, and the other ones go up in the hierarchy.
    '''

    def __init__(self, name, namespace, members, abstract):
        Declaration.__init__(self, name, namespace)
        self.__members = members
        self.__member_names = {}
        self.abstract = abstract
        self.bases = ()
        self.hierarchy = ()
        self.operator = {}


    def __iter__(self):
        '''iterates through the class' members.
        '''
        return iter(self.__members)            


    def Constructors(self, publics_only=True):
        '''Returns a list of the constructors for this class.
        @rtype: list
        '''
        constructors = []
        for member in self:
            if isinstance(member, Constructor):
                if publics_only and member.visibility != Scope.public:
                    continue
                constructors.append(member)
        return constructors

    
    def HasCopyConstructor(self):
        '''Returns true if this class has a public copy constructor.
        @rtype: bool
        '''
        for cons in self.Constructors():
            if cons.IsCopy():
                return True
        return False


    def HasDefaultConstructor(self):
        '''Returns true if this class has a public default constructor.
        @rtype: bool
        '''
        for cons in self.Constructors():
            if cons.IsDefault():
                return True
        return False


    def AddMember(self, member):
        if member.name in self.__member_names:
            member.is_unique = False
            for m in self:
                if m.name == member.name:
                    m.is_unique = False
        else:
            member.is_unique = True
        self.__member_names[member.name] = 1
        self.__members.append(member)
        if isinstance(member, ClassOperator):
            self.operator[member.name] = member


    def ValidMemberTypes():
        return (NestedClass, Method, Constructor, Destructor, ClassVariable, 
                ClassOperator, ConverterOperator, ClassEnumeration)   
    ValidMemberTypes = staticmethod(ValidMemberTypes)

                          
#==============================================================================
# NestedClass
#==============================================================================
class NestedClass(Class):
    '''The declaration of a class/struct inside another class/struct.
    
    @type class: string
    @ivar class: fullname of the class where this class is contained.

    @type visibility: L{Scope} 
    @ivar visibility: the visibility of this class.
    '''

    def __init__(self, name, class_, visib, members, abstract):
        Class.__init__(self, name, None, members, abstract)
        self.class_ = class_
        self.visibility = visib


    def FullName(self):
        '''The full name of this class, like ns::outer::inner.
        @rtype: string
        '''
        return '%s::%s' % (self.class_, self.name)
    

#==============================================================================
# Scope    
#==============================================================================
class Scope:    
    '''Used to represent the visibility of various members inside a class.
    @cvar public: public visibility
    @cvar private: private visibility
    @cvar protected: protected visibility
    '''
    public = 'public'
    private = 'private'
    protected = 'protected'
    
 
#==============================================================================
# Base    
#==============================================================================
class Base:
    '''Represents a base class of another class.
    @ivar _name: the full name of the base class.
    @ivar _visibility: the visibility of the derivation.
    '''

    def __init__(self, name, visibility=Scope.public):
        self.name = name
        self.visibility = visibility

    
#==============================================================================
# Function    
#==============================================================================
class Function(Declaration):
    '''The declaration of a function.
    @ivar _result: instance of L{Type} or None.
    @ivar _parameters: list of L{Type} instances.
    @ivar _throws: exception specifiers or None 
    '''

    def __init__(self, name, namespace, result, params, throws=None): 
        Declaration.__init__(self, name, namespace)
        # the result type: instance of Type, or None (constructors)            
        self.result = result
        # the parameters: instances of Type
        self.parameters = params
        # the exception specification
        self.throws     = throws 


    def Exceptions(self):
        if self.throws is None:
            return ""
        else:
            return " throw(%s)" % ', '.join ([x.FullName() for x in self.throws]) 


    def PointerDeclaration(self, force=False):
        '''Returns a declaration of a pointer to this function.
        @param force: If True, returns a complete pointer declaration regardless
        if this function is unique or not.
        '''
        if self.is_unique and not force:
            return '&%s' % self.FullName()
        else:
            result = self.result.FullName()
            params = ', '.join([x.FullName() for x in self.parameters]) 
            return '(%s (*)(%s)%s)&%s' % (result, params, self.Exceptions(), self.FullName())

    
    def MinArgs(self):
        min = 0
        for arg in self.parameters:
            if arg.default is None:
                min += 1
        return min

    minArgs = property(MinArgs)
    

    def MaxArgs(self):
        return len(self.parameters)

    maxArgs = property(MaxArgs)

    
    
#==============================================================================
# Operator
#==============================================================================
class Operator(Function):
    '''The declaration of a custom operator. Its name is the same as the 
    operator name in C++, ie, the name of the declaration "operator+(..)" is
    "+".
    '''
    
    def FullName(self):
        namespace = self.namespace or ''
        if not namespace.endswith('::'):
            namespace += '::'
        return namespace + 'operator' + self.name 


#==============================================================================
# Method
#==============================================================================
class Method(Function):
    '''The declaration of a method.
    
    @ivar _visibility: the visibility of this method.
    @ivar _virtual: if this method is declared as virtual.
    @ivar _abstract: if this method is virtual but has no default implementation.
    @ivar _static: if this method is static.
    @ivar _class: the full name of the class where this method was declared.
    @ivar _const: if this method is declared as const.
    @ivar _throws: list of exception specificiers or None
    '''

    def __init__(self, name, class_, result, params, visib, virtual, abstract, static, const, throws=None): 
        Function.__init__(self, name, None, result, params, throws)
        self.visibility = visib
        self.virtual = virtual
        self.abstract = abstract
        self.static = static
        self.class_ = class_
        self.const = const

    
    def FullName(self):
        return self.class_ + '::' + self.name


    def PointerDeclaration(self, force=False):
        '''Returns a declaration of a pointer to this member function.
        @param force: If True, returns a complete pointer declaration regardless
        if this function is unique or not. 
        '''
        if self.static:
            # static methods are like normal functions
            return Function.PointerDeclaration(self, force)
        if self.is_unique and not force:
            return '&%s' % self.FullName()
        else:
            result = self.result.FullName()
            params = ', '.join([x.FullName() for x in self.parameters]) 
            const = ''
            if self.const:
                const = 'const'            
            return '(%s (%s::*)(%s) %s%s)&%s' %\
                (result, self.class_, params, const, self.Exceptions(), self.FullName())  


#==============================================================================
# Constructor
#==============================================================================
class Constructor(Method):