home *** CD-ROM | disk | FTP | other *** search
- /* Code for implementation for Objective-C EltNode objects
- Copyright (C) 1993 Free Software Foundation, Inc.
-
- Written by: R. Andrew McCallum <mccallum@cs.rochester.edu>
- Dept. of Computer Science, U. of Rochester, Rochester, NY 14627
-
- This file is part of the GNU Objective-C library.
-
- This library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Library General Public
- License as published by the Free Software Foundation; either
- version 2 of the License, or (at your option) any later version.
-
- This library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Library General Public License for more details.
-
- You should have received a copy of the GNU Library General Public
- License along with this library; if not, write to the Free
- Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
- /* This file gets included in all the ...EltNode.m files.
- Doing this silly #include stuff is a poor substitute for multiple
- inheritance. sigh.
-
- Pattern:
-
- @implementation FooEltNode : FooNode
- #include <objects/EltNode-m>
- @end
- */
-
- #include <objects/eltfuncs.h>
-
- - initElement: (elt)anElement
- encoding: (const char *)eltEncoding
- {
- [super init];
- _element = anElement;
- _elt_comparison_function = elt_get_comparison_function(eltEncoding);
- return self;
- }
-
- /* Archiving must mimic the above designated initializer */
-
- - (void) encodeWithCoder: (Coder*)aCoder
- {
- const char *encoding;
-
- [super encodeWithCoder:aCoder];
- encoding = elt_get_encoding(_elt_comparison_function);
- [aCoder encodeValueOfType:@encode(char*) at:&encoding
- withName:"EltNode Content Type Encoding"];
- [aCoder encodeValueOfType:encoding
- at:elt_get_ptr_to_member(encoding, &_element)
- withName:"EltNode Content Element"];
- }
-
- - (elt*) _elementDataPtr
- {
- return &_element;
- }
-
- - (int(**)(elt,elt)) _eltComparisonFunctionPtr
- {
- return &_elt_comparison_function;
- }
-
- + newWithCoder: (Coder*)aCoder
- {
- id n;
- char *encoding;
-
- n = [super newWithCoder:aCoder];
- [aCoder decodeValueOfType:@encode(char*)
- at:&encoding
- withName:NULL];
- *[n _eltComparisonFunctionPtr] = elt_get_comparison_function(encoding);
- [aCoder decodeValueOfType:encoding
- at:[n _elementDataPtr]
- withName:NULL];
- return n;
- }
-
- - write: (TypedStream*)aStream
- {
- const char *encoding;
-
- [super write:aStream];
- encoding = elt_get_encoding(_elt_comparison_function);
- objc_write_type(aStream, @encode(char*), &encoding);
- objc_write_types(aStream, encoding,
- elt_get_ptr_to_member(encoding, &_element));
- return self;
- }
-
- - read: (TypedStream*)aStream
- {
- char *encoding;
-
- [super read:aStream];
- objc_read_type(aStream, @encode(char*), &encoding);
- _elt_comparison_function = elt_get_comparison_function(encoding);
- objc_read_type(aStream, encoding,
- elt_get_ptr_to_member(encoding,&_element));
- return self;
- }
-
- - (int(*)(elt,elt)) comparisonFunction
- {
- return _elt_comparison_function;
- }
-
- - (elt) elementData
- {
- return _element;
- }
-
- - (int) compare: anotherObject
- {
- /* perhaps we should do more checking first */
- return _elt_comparison_function(_element, [anotherObject elementData]);
- }
-
- - printForDebugger
- {
- elt_fprintf_elt(stdout,
- elt_get_encoding(_elt_comparison_function),
- _element);
- printf("\n");
- return self;
- }
-