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/*
* Copyright (C) 1997-2004, Michael Jennings
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies of the Software, its documentation and marketing & publicity
* materials, and acknowledgment shall be given in the documentation, materials
* and software packages that this Software was used.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef _LIBAST_OBJ_H_
#define _LIBAST_OBJ_H_
/**
* @file obj.h
* LibAST Object Infrastructure -- Generic Objects
*
* This file contains macros and type definitions for creating and
* manipulating basic generic objects.
*
* @author Michael Jennings <mej@eterm.org>
* $Revision: 1.29 $
* $Date: 2004/07/16 23:22:18 $
*/
/*@{*/
/**
* @name Object Definition and Declaration Macros
* ---
*
* This set of macros is intended to abstract certain details about
* the internal workings of objects and greatly simplify their
* definition. The results have been known to cause non-cpp-compliant
* parsers to have the occasional fit, but they work. :-)
*
* @ingroup DOXGRP_OBJ
*/
/**
* Declare an object structure.
*
* This macro abstracts the actual name of the object structure to
* help prevent its direct use. Obviously the translation is plainly
* visible, so those sufficiently determined to do it the Wrong Way
* still can. This macro is not used directly, but rather as part of
* the SPIF_DECL_OBJ() macro (see below), which is in turn used to
* define object types.
*
* @param t The object type as a non-quoted string (e.g., obj).
* @return The @c struct keyword followed by the structure name for
* the specified object type.
*
* @see @link DOXGRP_OBJ LibAST Object Infrastructure @endlink, SPIF_DECL_OBJ(), SPIF_DECL_TYPE()
*/
#define SPIF_DECL_OBJ_STRUCT(t) struct spif_ ## t ## _t_struct
/**
* Declare an object type based on the structure definition immediately
* following.
*
* This macro simplifies the creation of a new class by adding the
* appropriate @c typedef along with introducing the structure
* definition. Although use of this macro presents a bit of an
* unnatural parsing problem for non-cpp-aware tools (e.g., indent),
* its use is recommended for encapsulation purposes. Invocation of
* this macro should be immediately followed by an open brace ('{')
* and a normal C-style structure definition.
*
* @param t The object type as a non-quoted string (e.g., obj).
* @return An appropriate @c typedef and @c struct introducer.
*
* @see @link DOXGRP_OBJ LibAST Object Infrastructure @endlink, SPIF_DECL_TYPE(), SPIF_DECL_OBJ_STRUCT()
*/
#define SPIF_DECL_OBJ(t) SPIF_DECL_TYPE(t, SPIF_DECL_OBJ_STRUCT(t)); SPIF_DECL_OBJ_STRUCT(t)
/**
* Declare the parent type of an object being defined.
*
* This macro is used to declare that a particular object type (e.g.,
* obj) is the parent type of an object which is being defined via
* SPIF_DECL_OBJ(). The call to this macro should @em immediately
* follow the opening brace (which, in turn, immediately follows the
* call to SPIF_DECL_OBJ()). Declaring the parent type allows for
* safe typecasting of any object of the current type to its parent
* type (or any parent type in its "family tree"). At minimum, any
* true object must at @em least be derived from the @c obj type so
* that it can be safely cast to a generic object.
*
* @param t The object type as a non-quoted string (e.g., obj).
*
* @see @link DOXGRP_OBJ LibAST Object Infrastructure @endlink, SPIF_CONST_TYPE()
*/
#define SPIF_DECL_PARENT_TYPE(t) SPIF_CONST_TYPE(t) parent
/**
* Declare the class variable for objects of a given type.
*
* Every object type has a class variable which is declared using this
* macro. Any instance of that type of object contains a pointer to
* this same class variable. This class variable is both declared and
* referenced using this macro so that its actual name is abstracted.
*
* @param type The object type as a non-quoted string (e.g., obj).
* @return The class variable for the given type.
*
* @see @link DOXGRP_OBJ LibAST Object Infrastructure @endlink
*/
#define SPIF_CLASS_VAR(type) spif_ ## type ## _class
/**
* Declare a "property" of an object.
*
* This macro is used when declaring a class to specify that a
* particular class object is a "property." A "property" is an object
* member which has public get/set methods of the same name.
*
* @param type The type of the property variable.
* @param name The name of the property.
*
* @see @link DOXGRP_OBJ LibAST Object Infrastructure @endlink
*/
#define SPIF_DECL_PROPERTY(type, name) SPIF_TYPE(type) name
/**
* Declare a "property" of an object.
*
* This macro is identical to SPIF_DECL_PROPERTY(), except that a
* native C type is used.
*
* @param type The C type of the property variable.
* @param name The name of the property.
*
* @see @link DOXGRP_OBJ LibAST Object Infrastructure @endlink, SPIF_DECL_PROPERTY()
*/
#define SPIF_DECL_PROPERTY_C(type, name) type name
/**
* Declare the get/set methods of a "property" of an object.
*
* This macro is used to prototype the get/set methods of an object
* property.
*
* @param otype The type of the object.
* @param vtype The type of the property variable.
* @param name The name of the property.
*
* @see @link DOXGRP_OBJ LibAST Object Infrastructure @endlink
*/
#define SPIF_DECL_PROPERTY_FUNC(otype, vtype, name) \
SPIF_TYPE(vtype) spif_ ## otype ## _get_ ## name (SPIF_TYPE(otype)); \
SPIF_TYPE(bool) spif_ ## otype ## _set_ ## name (SPIF_TYPE(otype), SPIF_TYPE(vtype))
/**
* Declare the get/set methods of a "property" of an object.
*
* This macro is identical to SPIF_DECL_PROPERTY_FUNC(), except that a
* native C type is used.
*
* @param otype The type of the object.
* @param vtype The C type of the property variable.
* @param name The name of the property.
*
* @see @link DOXGRP_OBJ LibAST Object Infrastructure @endlink, SPIF_DECL_PROPERTY_FUNC()
*/
#define SPIF_DECL_PROPERTY_FUNC_C(otype, vtype, name) \
vtype spif_ ## otype ## _get_ ## name (SPIF_TYPE(otype)); \
SPIF_TYPE(bool) spif_ ## otype ## _set_ ## name (SPIF_TYPE(otype), vtype)
/**
* Define the get/set methods of a "property" of an object.
*
* This macro is used to define (i.e., create, i.e. insert the code
* for) the get/set methods of an object property.
*
* @param otype The type of the object.
* @param vtype The type of the property variable.
* @param name The name of the property.
*
* @see @link DOXGRP_OBJ LibAST Object Infrastructure @endlink
*/
#define SPIF_DEFINE_PROPERTY_FUNC(otype, vtype, name) \
SPIF_TYPE(vtype) spif_ ## otype ## _get_ ## name (SPIF_TYPE(otype) self) \
{ return (self->name); } \
SPIF_TYPE(bool) spif_ ## otype ## _set_ ## name (SPIF_TYPE(otype) self, SPIF_TYPE(vtype) new_ ## name) \
{ \
if (!SPIF_OBJ_ISNULL(self->name)) { \
SPIF_OBJ_DEL(self->name); \
} \
self->name = new_ ## name; \
return TRUE; \
}
/**
* Define the get/set methods of a "property" of an object.
*
* This macro is identical to SPIF_DEFINE_PROPERTY_FUNC(), except that
* the property is treated as a non-object (i.e., its current value is
* not checked, so no destructor is called for the current value).
* Use this for spif_*_t types that are not objects, such as
* spif_int32_t and spif_sockport_t.
*
* @param otype The type of the object.
* @param vtype The type of the property variable.
* @param name The name of the property.
*
* @see @link DOXGRP_OBJ LibAST Object Infrastructure @endlink, SPIF_DEFINE_PROPERTY_FUNC()
*/
#define SPIF_DEFINE_PROPERTY_FUNC_NONOBJ(otype, vtype, name) \
SPIF_TYPE(vtype) spif_ ## otype ## _get_ ## name (SPIF_TYPE(otype) self) \
{ return (self->name); } \
SPIF_TYPE(bool) spif_ ## otype ## _set_ ## name (SPIF_TYPE(otype) self, SPIF_TYPE(vtype) new_ ## name) \
{ \
self->name = new_ ## name; \
return TRUE; \
}
/**
* Define the get/set methods of a "property" of an object.
*
* This macro is identical to SPIF_DEFINE_PROPERTY_FUNC(), except that
* a native C type is used.
*
* @param otype The type of the object.
* @param vtype The C type of the property variable.
* @param name The name of the property.
*
* @see @link DOXGRP_OBJ LibAST Object Infrastructure @endlink, SPIF_DEFINE_PROPERTY_FUNC()
*/
#define SPIF_DEFINE_PROPERTY_FUNC_C(otype, vtype, name) \
vtype spif_ ## otype ## _get_ ## name (SPIF_TYPE(otype) self) \
{ return (self->name); } \
SPIF_TYPE(bool) spif_ ## otype ## _set_ ## name (SPIF_TYPE(otype) self, vtype new_ ## name) \
{ \
self->name = new_ ## name; \
return TRUE; \
}
/*@}*/
/*@{*/
/**
* @name Generic Object/Class Casting Macros
* ---
*
* This set of macros allows objects of any type (i.e., any object
* descended from the basic "obj" or "class" type) to be treated as
* generic object/class variables. In other words, as long as an
* object is properly defined (i.e., properly descended from its basic
* type), it can be treated as that basic type via use of these
* macros. The end result is that any operation which is defined for
* all objects can be executed on an object of any type without the
* need to know its exact type.
*
* @ingroup DOXGRP_OBJ
*/
/**
* Cast an arbitrary class object to the generic class type.
*
* Most non-interface classes use the generic obj-style class
* variable, containing only the basic methods (create, delete,
* compare, etc.) that every object needs. However, interface classes
* require the use of more specific class objects with support for
* additional object methods. This macro allows an arbitrary class
* object, be it the generic class type or a decendent thereof, to be
* cast to the generic class type. This allows basic method calls to
* be performed on complex types by treating them as simple objects.
*
* @param cls An arbitrary class object.
* @return The class object cast to the generic type.
*
* @see @link DOXGRP_OBJ LibAST Object Infrastructure @endlink, SPIF_OBJ_CLASS(), SPIF_CAST()
*/
#define SPIF_CLASS(cls) (SPIF_CAST(class) (cls))
/**
* Cast an arbitrary class object to a const generic class type.
*
* This macro is equivalent to SPIF_CLASS(), except that the resulting
* object is a @c const object.
*
* @param cls An arbitrary class object.
* @return The class object cast to the generic type.
*
* @see @link DOXGRP_OBJ LibAST Object Infrastructure @endlink, SPIF_CLASS(), SPIF_CONST_CAST()
*/
#define SPIF_CONST_CLASS(cls) (SPIF_CONST_CAST(class) (cls))
/**
* Cast an arbitrary object to an obj.
*
* This macro allows an arbitrary object of any valid object type
* (i.e., anything derived from spif_obj_t) to be treated as a generic
* object (the spif_obj_t type). Any method defined for generic
* objects (i.e., all objects) can be called on any object using a
* typecast such as this, and any function or macro which needs an
* arbitrary object can be passed any object using this macro.
*
* @param o An object of any valid type.
* @return A generic object reference to that object.
*
* @see @link DOXGRP_OBJ LibAST Object Infrastructure @endlink, SPIF_CAST()
*/
#define SPIF_OBJ(o) (SPIF_CAST(obj) (o))
/*@}*/
/*@{*/
/**
* @name Generic Object Type Safety Macros
* ---
*
* Macros in this group are used to verify the validity of an object
* instance and its type.
*
* @ingroup DOXGRP_OBJ
*/
/**
* Determine if an arbitrary object is of type "obj."
*
* This macro returns a boolean value based on whether or not the
* object passed to it is of type "obj." Obviously, this will almost
* never been the case, since the actual obj type is too generic to be
* useful for anything other than a parent class. However, each
* object type needs to define a macro like this named
* SPIF_OBJ_IS_xxx() (where xxx is the object type), so this macro
* serves as a template for how those should be written.
*
* This type-verification class for each object type should always be
* defined as this one is -- simply a wrapper around
* SPIF_OBJ_IS_TYPE().
*
* @param o The object to test.
* @return Whether or not the object is of type "obj."
*
* @see @link DOXGRP_OBJ LibAST Object Infrastructure @endlink, SPIF_OBJ_IS_TYPE()
*/
#define SPIF_OBJ_IS_OBJ(o) (SPIF_OBJ_IS_TYPE(o, obj))
/**
* Determine if an object of type "obj" is NULL.
*
* This macro returns a boolean value based on whether or not the
* object passed to it is NULL. The object is cast to type "obj"
* before the comparison, so it should work for any valid object.
* This macro will not often be used by user code. However, each
* object type needs to define a macro like this named
* SPIF_xxx_ISNULL() (where xxx is the object type), so this macro
* serves as a template for how those should be written.
*
* @param o The object to test.
* @return Whether or not the object is NULL.
*
* @see @link DOXGRP_OBJ LibAST Object Infrastructure @endlink, SPIF_OBJ(), SPIF_NULL_TYPE()
*/
#define SPIF_OBJ_ISNULL(o) (SPIF_OBJ(o) == SPIF_NULL_TYPE(obj))
/**
* Determine if an object is of a given type.
*
* This macro returns a boolean value based on whether or not the
* given object, @a o, is of type @a type. It provides the driving
* force behind all SPIF_OBJ_IS_xxx()-style macros. Unlike the
* SPIF_OBJ_CHECK_TYPE() macro, this macro will @em always verify the
* object type. If you need a debugging assertion instead, use
* SPIF_OBJ_CHECK_TYPE(), as it will resolve to @c (1) in
* non-debugging code.
*
* @param o The object to test.
* @param type The type to check for.
* @return Whether or not @a o is of type @a type.
*
* @see @link DOXGRP_OBJ LibAST Object Infrastructure @endlink, SPIF_OBJ_ISNULL(), SPIF_OBJ_CLASS(),
* SPIF_CLASS_VAR(), SPIF_OBJ_CHECK_TYPE()
*/
#define SPIF_OBJ_IS_TYPE(o, type) ((!SPIF_OBJ_ISNULL(o)) && (SPIF_OBJ_CLASS(o) == SPIF_CLASS_VAR(type)))
/**
* Provide debugging assertion that an object is of a given type.
*
* This macro returns a boolean value based on whether or not the
* given object, @a o, is of type @a type. It is intended for
* situations where the test only needs to be performed in debugging
* code. If DEBUG is 0, it will resolve to @c (1). If DEBUG is
* between 1 and 4 inclusive, it will simply be a NULL check. Higher
* debug levels will treat it just like SPIF_OBJ_IS_TYPE().
*
* @param o The object to test.
* @param type The type to check for.
* @return Whether or not @a o is of type @a type.
*
* @see @link DOXGRP_OBJ LibAST Object Infrastructure @endlink, SPIF_OBJ_ISNULL(), SPIF_OBJ_IS_TYPE()
*/
#if DEBUG == 0
# define SPIF_OBJ_CHECK_TYPE(o, type) (1)
#elif DEBUG <= 4
# define SPIF_OBJ_CHECK_TYPE(o, type) (!SPIF_OBJ_ISNULL(o))
#else
# define SPIF_OBJ_CHECK_TYPE(o, type) SPIF_OBJ_IS_TYPE(o, type)
#endif
/*@}*/
/*@{*/
/**
* @name Generic Object Instance Macros
* ---
*
* This set of macros manipulates actual object instances in various
* ways. They can be used on any object.
*
* @ingroup DOXGRP_OBJ
*/
/**
* Access the class for a given object.
*
* Every object has a member variable that references its class.
* There is a single class object for each individual object type, and
* all instances of that type reference the same class object. If you
* know the type of an object, you can use SPIF_CLASS_VAR() to access
* its class object (i.e., the class object for that type). However,
* this macro can be used to access the class object of @em any
* object, regardless of whether or not you know its type.
*
* @note This macro returns an object of type spif_class_t, so only
* methods common to all objects can be called using this macro.
* Other class types should define their own SPIF_xxx_CLASS() macro to
* access methods specific to that class.
*
* @param obj An object of arbitrary/unknown type.
* @return The class object for the given object.
*
* @see @link DOXGRP_OBJ LibAST Object Infrastructure @endlink, SPIF_CLASS(), SPIF_OBJ()
*/
#define SPIF_OBJ_CLASS(obj) (SPIF_CLASS(SPIF_OBJ(obj)->cls))
/**
* Obtain the string representation of an object's class name.
*
* This macro will access the classname for an object. The classname
* will be enclosed in exclamation marks ('!') so as to help identify
* its origin. It is most often used as the return value for the
* @c type method of a given object type.
*
* @param obj An object of arbitrary/unknown type.
* @return The class name (as a spif_classname_t) for the given
* object.
*
* @see @link DOXGRP_OBJ LibAST Object Infrastructure @endlink, SPIF_OBJ_CLASS()
*/
#define SPIF_OBJ_CLASSNAME(obj) (SPIF_CAST(classname) SPIF_OBJ_CLASS(obj))
/**
* Call the named method for a given object.
*
* The methods which can be called on a given object are defined by
* that object's class. Since all objects are derived from
* spif_obj_t, and all classes are derived from spif_class_t (the
* class type for "obj"), the methods defined by spif_class_t can be
* called on any arbitrary object, regardless of its actual
* object/class types. This macro provides the mechanism by which
* this is done.
*
* @note This macro should not be called directly. It is used by the
* SPIF_OBJ_*() macros and as a template for interface classes.
*
* @param obj An object of arbitrary/unknown type.
* @param meth The name of the method to call.
* @return A pointer to the specified method for that object.
*
* @see @link DOXGRP_OBJ LibAST Object Infrastructure @endlink, SPIF_OBJ_CLASS()
*/
#define SPIF_OBJ_CALL_METHOD(obj, meth) SPIF_OBJ_CLASS(obj)->meth
/**
* Create an instance of a generic object.
*
* This macro allocates and returns an object of type "obj." Almost
* never used, but it's here for demonstration purposes anyway.
*
* @return An allocated object of type "obj."
*
* @see @link DOXGRP_OBJ LibAST Object Infrastructure @endlink, spif_obj_new()
*/
#define SPIF_OBJ_NEW() SPIF_CAST(obj) (SPIF_CLASS(SPIF_CLASS_VAR(obj)))->(noo)()
/**
* Initialize an object.
*
* This macro calls the @c init method of an object in order to
* initialize it.
*
* @param o An already-allocated object.
* @return #TRUE if successful, #FALSE otherwise.
*
* @see @link DOXGRP_OBJ LibAST Object Infrastructure @endlink, spif_obj_init()
*/
#define SPIF_OBJ_INIT(o) SPIF_CAST(bool) (SPIF_OBJ_CALL_METHOD((o), init)(o))
/**
* Clean up an object.
*
* This macro calls the @c done method of an object. This basically
* restores it to its original allocated-and-initialized state.
*
* @param o An object.
* @return #TRUE if successful, #FALSE otherwise.
*
* @see @link DOXGRP_OBJ LibAST Object Infrastructure @endlink, spif_obj_done()
*/
#define SPIF_OBJ_DONE(o) SPIF_CAST(bool) (SPIF_OBJ_CALL_METHOD((o), done)(o))
/**
* Delete an object.
*
* This macro calls the @c del method of an object, destroying it and
* freeing its memory.
*
* @param o An object. It will cease to exist after this call.
* @return #TRUE if successful, #FALSE otherwise.
*
* @see @link DOXGRP_OBJ LibAST Object Infrastructure @endlink, spif_obj_del()
*/
#define SPIF_OBJ_DEL(o) SPIF_CAST(bool) (SPIF_OBJ_CALL_METHOD((o), del)(o))
/**
* Convert the contents of an object to a string.
*
* This macro calls the @c show method of an object, returning a
* spif_str_t object containing its string representation.
*
* @param o The object to display.
* @param b An existing spif_str_t buffer to use. If NULL, a new str
* object will be created and returned.
* @param i Number of leading spaces to indent.
* @return A str object containing the string representation of @a o.
*
* @see @link DOXGRP_OBJ LibAST Object Infrastructure @endlink, spif_obj_show(), SPIF_SHOW()
*/
#define SPIF_OBJ_SHOW(o, b, i) SPIF_CAST(str) (SPIF_OBJ_CALL_METHOD((o), show)(o, #o, b, i))
/**
* Compare two objects.
*
* This macro calls the @c comp method of object #1 to compare the two
* objects.
*
* @param o1 Object #1.
* @param o2 Object #2.
* @return A spif_cmp_t value containing the comparison result.
*
* @see @link DOXGRP_OBJ LibAST Object Infrastructure @endlink, spif_obj_comp(), spif_comp_t
*/
#define SPIF_OBJ_COMP(o1, o2) SPIF_CAST(cmp) (SPIF_OBJ_CALL_METHOD((o1), comp)(o1, o2))
/**
* Duplicate an object.
*
* This macro calls the @c dup method of an object. A copy of the
* object is returned.
*
* @param o An object.
* @return A duplicate of that object.
*
* @see @link DOXGRP_OBJ LibAST Object Infrastructure @endlink, spif_obj_dup()
*/
#define SPIF_OBJ_DUP(o) SPIF_CAST(obj) (SPIF_OBJ_CALL_METHOD((o), dup)(o))
/**
* Obtain the type of the object.
*
* This macro calls the @c type method of an object to obtain its
* classname.
*
* @param o An object.
* @return The classname of that object.
*
* @see @link DOXGRP_OBJ LibAST Object Infrastructure @endlink, spif_obj_type(), SPIF_OBJ_CLASSNAME()
*/
#define SPIF_OBJ_TYPE(o) SPIF_CAST(classname) (SPIF_OBJ_CALL_METHOD((o), type)(o))
/*@}*/
/*@{*/
/**
* @name Object Display Convenience Macros
* ---
*
* This set of macros simplifies the process of displaying (as a
* string) the contents of an object. They can be used on any object.
*
* @ingroup DOXGRP_OBJ
*/
/**
* Convenience macro for displaying an object.
*
* This macro provides an easy way to output the string
* representation of an object to a given file descriptor. The macro
* itself handles the creation and deletion of the temporary @c str
* object required (hence the "convenience").
*
* @param o The object to display.
* @param fd The file descriptor to display it on.
*
* @see @link DOXGRP_OBJ LibAST Object Infrastructure @endlink, spif_obj_show()
*/
#define SPIF_SHOW(o, fd) do { \
spif_str_t tmp__; \
tmp__ = SPIF_OBJ_SHOW(o, SPIF_NULL_TYPE(str), 0); \
fprintf(fd, "%s", SPIF_STR_STR(tmp__)); \
spif_str_del(tmp__); \
} while (0)
/**
* Convenience macro for displaying a NULL value for an object.
*
* Obviously, one cannot invoke the @c show method of a NULL object.
* This macro exists to provide a uniform way for object @c show
* methods to easily (and uniformly) display NULL objects.
*
* @param t The type of the NULL object.
* @param n The name of the NULL object (variable name).
* @param b A str object to which to assign the result.
* @param i Number of spaces to indent.
* @param tmp A char[] buffer of fixed size used for temporary
* storage.
*
* @see @link DOXGRP_OBJ LibAST Object Infrastructure @endlink, spif_obj_show()
*/
#define SPIF_OBJ_SHOW_NULL(t, n, b, i, tmp) do { \
memset(tmp, ' ', (i)); \
snprintf(SPIF_CAST_C(char *) tmp + (i), sizeof(tmp) - (i), \
"(spif_" #t "_t) %s: " SPIF_NULLSTR_TYPE(t) "\n", \
NONULL(n)); \
if (SPIF_STR_ISNULL(b)) { \
(b) = spif_str_new_from_ptr(SPIF_CAST(charptr) tmp); \
} else { \
spif_str_append_from_ptr((b), SPIF_CAST(charptr) tmp); \
} \
} while (0)
/**
* Convenience macro for handling NULL objects in a comparison.
*
* This macro exists because I got tired of typing the same thing over
* and over again to handle comparisons where either object may be
* NULL. You should have this at the start of all of your *_comp()
* functions.
*
* @param s The "self" (first) object.
* @param o The "other" (second) object.
*
* @see @link DOXGRP_OBJ LibAST Object Infrastructure @endlink, spif_obj_comp()
*/
#define SPIF_OBJ_COMP_CHECK_NULL(s, o) do { \
if (SPIF_OBJ_ISNULL((s)) && SPIF_OBJ_ISNULL((o))) { \
return SPIF_CMP_EQUAL; \
} else if (SPIF_OBJ_ISNULL((s))) { \
return SPIF_CMP_LESS; \
} else if (SPIF_OBJ_ISNULL((o))) { \
return SPIF_CMP_GREATER; \
} \
} while (0)
/*@}*/
/*@{*/
/**
* @name Basic Object Class Definitions
* ---
*
* These types form the foundation of the LibAST object hierarchy.
*
* @ingroup DOXGRP_OBJ
*/
/**
* Object class structure.
*
* This class contains the object class structure. It contains the
* string representation of the class name followed by a series of
* function pointers to the member functions for the class. The basic
* class type contains methods that all objects require. The
* structure members should not be accessed directly, but rather via
* the appropriate macros.
*
* @note Doxygen doesn't understand how to handle the macro-based
* class definition for this structure, so it thinks it's a function.
* It's actually a struct definition (spif_const_class_t) and a
* pointer definition (spif_class_t) as provided by the
* SPIF_DEFINE_OBJ() macro.
*
* @see @link DOXGRP_OBJ LibAST Object Infrastructure @endlink, SPIF_OBJ_CALL_METHOD()
*/
SPIF_DECL_OBJ(class) {
/** Text representation of class name. */
spif_classname_t classname;
spif_func_t noo;
spif_func_t init;
spif_func_t done;
spif_func_t del;
spif_func_t show;
spif_func_t comp;
spif_func_t dup;
spif_func_t type;
};
/* An obj is the most basic object type. It contains simply a pointer to
the class name (a const char * so you can test it with ==). */
/**
* Generic object structure.
*
* The @c obj type is the parent of all other object types. Since it
* doesn't actually store any data, the only member of the @c obj
* type is its spif_class_t
*
* @note Doxygen doesn't understand how to handle the macro-based
* class definition for this structure, so it thinks it's a function.
* It's actually a struct definition (spif_const_obj_t) and a pointer
* definition (spif_obj_t) as provided by the SPIF_DEFINE_OBJ()
* macro.
*
* @see @link DOXGRP_OBJ LibAST Object Infrastructure @endlink
*/
SPIF_DECL_OBJ(obj) {
spif_class_t cls;
};
/*@}*/
/* We need typedef's from here... */
#include <libast/str.h>
extern spif_class_t SPIF_CLASS_VAR(obj);
extern spif_obj_t spif_obj_new(void);
extern spif_bool_t spif_obj_del(spif_obj_t);
extern spif_bool_t spif_obj_init(spif_obj_t);
extern spif_bool_t spif_obj_done(spif_obj_t);
extern spif_class_t spif_obj_get_class(spif_obj_t);
extern spif_bool_t spif_obj_set_class(spif_obj_t, spif_class_t);
extern spif_str_t spif_obj_show(spif_obj_t, spif_charptr_t, spif_str_t, size_t);
extern spif_cmp_t spif_obj_comp(spif_obj_t, spif_obj_t);
extern spif_obj_t spif_obj_dup(spif_obj_t);
extern spif_classname_t spif_obj_type(spif_obj_t);
#endif /* _LIBAST_OBJ_H_ */