73 lines
1.8 KiB
C
73 lines
1.8 KiB
C
/*
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* $Id: class.c,v 1.5 2005-05-24 03:28:31 bacon Exp $
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*/
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#include <xp/stx/class.h>
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#include <xp/stx/symbol.h>
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#include <xp/stx/object.h>
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#include <xp/stx/hash.h>
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#include <xp/stx/misc.h>
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xp_stx_word_t xp_stx_new_class (xp_stx_t* stx, const xp_stx_char_t* name)
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{
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xp_stx_word_t meta, class;
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xp_stx_word_t class_name;
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meta = xp_stx_alloc_word_object (stx, XP_STX_METACLASS_SIZE);
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XP_STX_CLASS(stx,meta) = stx->class_metaclass;
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XP_STX_AT(stx,meta,XP_STX_METACLASS_SPEC) =
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XP_STX_TO_SMALLINT((XP_STX_METACLASS_SIZE << 1) | 0x00);
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class = xp_stx_alloc_word_object (stx, XP_STX_CLASS_SIZE);
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XP_STX_CLASS(stx,class) = meta;
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class_name = xp_stx_new_symbol (stx, name);
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XP_STX_AT(stx,class,XP_STX_CLASS_NAME) = class_name;
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xp_stx_hash_insert (stx, stx->smalltalk,
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xp_stx_hash_char_object(stx, class_name),
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class_name, class);
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return class;
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}
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xp_stx_word_t xp_stx_new_metaclass (xp_stx_t* stx, xp_stx_word class)
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{
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meta = xp_stx_alloc_word_object (stx, XP_STX_METACLASS_SIZE);
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meta_obj = meta;
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if (class == stx->class_class) {
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/*
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* "Object class superclass" returns "Class"
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* whereas "Class subclasses" just returns an empty array
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* because "Object class" is not registered as a subclass of
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* "Class".
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*/
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meta_obj->superclass = stx->class_class;
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}
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else {
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meta_obj->superclass = (class, SUPERCLASS)->class;
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}
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meta_obj->name = class_obj->name;
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meta_obj->instance_class = class;
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return meta;
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}
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xp_stx_word_t xp_stx_lookup_class (xp_stx_t* stx, const xp_stx_char_t* name)
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{
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xp_stx_word_t link, meta, value;
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link = xp_stx_hash_lookup_symbol (stx, stx->smalltalk, name);
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if (link == stx->nil) return stx->nil;
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value = XP_STX_AT(stx,link,XP_STX_PAIRLINK_VALUE);
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meta = XP_STX_CLASS(stx,value);
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if (XP_STX_CLASS(stx,meta) != stx->class_metaclass) return stx->nil;
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return value;
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}
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