class.c

C++的一个好库。。。现在很流行

/* Copyright Vladiir Prus 2003. Distributed under 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) */

#include "class.h"
#include "strings.h"
#include "variable.h"
#include "frames.h"
#include "rules.h"
#include "newstr.h"

#include "hash.h"

static struct hash* classes = 0;

static void check_defined(LIST* class_names)
{
    for (; class_names; class_names = class_names->next) {
        char** p = &class_names->string;
        if (!hashcheck(classes, (HASHDATA**)&p)) {
            printf("Class %s is not defined\n", class_names->string);
            abort();
        }
    }
}

static char* class_module_name(char* declared_name)
{
    string name[1];
    char* result;
    
    string_new(name);
    string_append(name, "class@");
    string_append(name, declared_name);

    result = newstr(name->value);
    string_free(name);
    
    return result;
}

struct import_base_data {
    char* base_name;
    module_t* base_module;
    module_t* class_module;
};

static void import_base_rule(void* r_, void* d_)
{
    RULE* r = (RULE*)r_;
    RULE* ir1;
    RULE* ir2;
    struct import_base_data* d = (struct import_base_data*)d_;
    string qualified_name[1];
    int basename_lenght = strlen(d->base_name)+1;

    string_new(qualified_name);
    string_append(qualified_name, d->base_name);
    string_push_back(qualified_name, '.');
    string_append(qualified_name, r->name);    

    ir1 = import_rule(r, d->class_module, r->name);
    ir2 = import_rule(r, d->class_module, qualified_name->value);

    /* Copy 'exported' flag. */
    ir1->exported = ir2->exported = r->exported;

    /* If we're importing class method, localize it. */
    if (r->module == d->base_module 
        || r->module->class_module && r->module->class_module == d->base_module) {
        ir1->module = ir2->module = d->class_module;        
    }
        
    string_free(qualified_name);
}

/** For each exported rule 'n', declared in class module for base,
    imports that rule in 'class' as 'n' and as 'base.n'. Imported
    rules are localized and marked as exported.
*/
static void import_base_rules(module_t* class, char* base)
{
    module_t* base_module = bindmodule(class_module_name(base));
    struct import_base_data d;
    d.base_name = base;
    d.base_module = base_module;
    d.class_module = class;

    if (base_module->rules)
        hashenumerate(base_module->rules, import_base_rule, &d);

    import_module( imported_modules(base_module), class );
}

char* make_class_module(LIST* xname, LIST* bases, FRAME* frame)
{
    char* name = class_module_name(xname->string);
    char** pp = &xname->string;
    module_t* class_module = 0;
    module_t* outer_module = frame->module;    

    if (!classes)
        classes = hashinit(sizeof(char*), "classes");

    
    if (hashcheck(classes, (HASHDATA**)&pp)) {        
        printf("Class %s already defined\n", xname->string);
        abort();
    } else {
        hashenter(classes, (HASHDATA**)&pp);
    }
    check_defined(bases);
    
    class_module = bindmodule(name);

    exit_module( outer_module );
    enter_module( class_module );

    var_set("__name__", xname, VAR_SET);
    var_set("__bases__", bases, VAR_SET);
    
    exit_module( class_module );
    enter_module( outer_module );
    
    for(; bases; bases = bases->next)
        import_base_rules(class_module, bases->string);



    return name;
}