コード例 #1
0
ファイル: set.c プロジェクト: alloy/mr-experimental
static void
rb_set_intersect_callback(const void *value, void *context)
{
    CFMutableSetRef *sets = (CFMutableSetRef *)context;
    if (CFSetContainsValue(sets[0], RB2OC(value)))
	CFSetAddValue(sets[1], RB2OC(value));
}
コード例 #2
0
ファイル: set.c プロジェクト: alloy/mr-experimental
static void
rb_set_subtract_callback(const void *value, void *context)
{
    CFMutableSetRef *sets = context;
    if (CFSetContainsValue(sets[0], RB2OC(value)))
	CFSetRemoveValue(sets[1], RB2OC(value));
}
コード例 #3
0
ファイル: set.c プロジェクト: alloy/mr-experimental
static void
rb_set_union_callback(const void *value, void *context)
{
    CFMutableSetRef set = context;
    if (!CFSetContainsValue(set, RB2OC(value)))
	CFSetAddValue(set, RB2OC(value));
}
コード例 #4
0
ファイル: set.c プロジェクト: alloy/mr-experimental
static VALUE
merge_i(VALUE val, VALUE *args)
{
    VALUE set = (VALUE)args;
    if (!CFSetContainsValue((CFMutableSetRef)set, (const void *)RB2OC(val))) {
	CFSetAddValue((CFMutableSetRef)set, (const void *)RB2OC(val));
    }

    return Qnil;
}
コード例 #5
0
ファイル: set.c プロジェクト: alloy/mr-experimental
static VALUE
rb_set_delete2(VALUE set, SEL sel, VALUE obj)
{
    rb_set_modify_check(set);

    if (CFSetContainsValue((CFMutableSetRef)set, (const void *)RB2OC(obj))) {
	CFSetRemoveValue((CFMutableSetRef)set, (const void *)RB2OC(obj));
	return set;
    } else
	return Qnil;
}
コード例 #6
0
ファイル: set.c プロジェクト: alloy/mr-experimental
static VALUE
rb_set_add2(VALUE set, SEL sel, VALUE obj)
{
    rb_set_modify_check(set);

    if (CFSetContainsValue((CFMutableSetRef)set, (const void *)RB2OC(obj))) {
	return Qnil;
    }
    CFSetAddValue((CFMutableSetRef)set, (const void *)RB2OC(obj));
    return set;
}
コード例 #7
0
ファイル: set.c プロジェクト: alloy/mr-experimental
static VALUE
rb_set_delete(VALUE set, SEL sel, VALUE obj)
{
    rb_set_modify_check(set);

    CFSetRemoveValue((CFMutableSetRef)set, (const void *)RB2OC(obj));
    return set;
}
コード例 #8
0
ファイル: hash.c プロジェクト: Jaharmi/MacRuby
static void *
imp_rhash_objectForKey(void *rcv, SEL sel, void *key)
{
    VALUE val;
    if (!st_lookup(RHASH(rcv)->tbl, OC2RB(key), &val)) {
	return NULL;
    }
    return RB2OC(val);
}
コード例 #9
0
ファイル: set.c プロジェクト: Sophrinix/iphone-macruby
static VALUE
rb_set_add(VALUE set, VALUE obj)
{
    rb_set_modify_check(set);

    CFSetAddValue((CFMutableSetRef)set, (const void *)RB2OC(obj));

    return set;
}
コード例 #10
0
ファイル: hash.c プロジェクト: Jaharmi/MacRuby
static void *
imp_rhash_keyenum_nextObject(void *rcv, SEL sel)
{
    rb_hash_keyenum_t *ke = (rb_hash_keyenum_t *)rcv;
    if (ke->pos == RARRAY_LEN(ke->keys)) {
	return NULL;
    }
    VALUE key = RARRAY_AT(ke->keys, ke->pos);
    ke->pos++;
    return (void *)RB2OC(key);
}
コード例 #11
0
ファイル: set.c プロジェクト: Sophrinix/iphone-macruby
static VALUE
rb_set_s_create(int argc, VALUE *argv, VALUE klass)
{
    int i;

    VALUE set = set_alloc(klass);

    for (i = 0; i < argc; i++)
	CFSetAddValue((CFMutableSetRef)set, RB2OC(argv[i]));

    return set;
}
コード例 #12
0
ファイル: kernel.c プロジェクト: silicon/MacRuby
PRIMITIVE void
vm_rval_to_ocval(VALUE rval, void **ocval)
{
    *ocval = rval == Qnil ? NULL : RB2OC(rval);
}
コード例 #13
0
ファイル: dispatcher.cpp プロジェクト: Hunter-Dolan/MacRuby
VALUE
rb_vm_dispatch(void *_vm, struct mcache *cache, VALUE top, VALUE self,
	Class klass, SEL sel, rb_vm_block_t *block, unsigned char opt,
	int argc, const VALUE *argv)
{
    RoxorVM *vm = (RoxorVM *)_vm;

#if ROXOR_VM_DEBUG
    bool cached = true;
#endif
    bool cache_method = true;

    Class current_super_class = vm->get_current_super_class();
    SEL current_super_sel = vm->get_current_super_sel();

    if (opt & DISPATCH_SUPER) {
	// TODO
	goto recache;
    }

    if (cache->sel != sel || cache->klass != klass || cache->flag == 0) {
recache:
#if ROXOR_VM_DEBUG
	cached = false;
#endif

	Method method;
	if (opt & DISPATCH_SUPER) {
	    if (!sel_equal(klass, current_super_sel, sel)) {
		current_super_sel = sel;
		current_super_class = klass;
	    }
	    else {
		// Let's make sure the current_super_class is valid before
		// using it; we check this by verifying that it's a real
		// super class of the current class, as we may be calling
		// a super method of the same name but on a totally different
		// class hierarchy.
		Class k = klass;
		bool current_super_class_ok = false;
		while (k != NULL) {
		    if (k == current_super_class) {
			current_super_class_ok = true;
			break;
		    }
		    k = class_getSuperclass(k);
		}
		if (!current_super_class_ok) {
		    current_super_class = klass;
		}
	    }
	    method = rb_vm_super_lookup(current_super_class, sel,
		    &current_super_class);
	}
	else {
	    current_super_sel = 0;
	    method = class_getInstanceMethod(klass, sel);
	}

	if (method != NULL) {
recache2:
	    IMP imp = method_getImplementation(method);

	    if (UNAVAILABLE_IMP(imp)) {
		// Method was undefined.
		goto call_method_missing;
	    }

	    rb_vm_method_node_t *node = GET_CORE()->method_node_get(method);

	    if (node != NULL) {
		// ruby call
		fill_rcache(cache, klass, sel, node);
	    }
	    else {
		// objc call
		fill_ocache(cache, self, klass, imp, sel, method, argc);
	    }

	    if (opt & DISPATCH_SUPER) {
		cache->flag |= MCACHE_SUPER;
	    }
	}
	else {
	    // Method is not found...

#if !defined(MACRUBY_STATIC)
	    // Force a method resolving, because the objc cache might be
	    // wrong.
	    if (rb_vm_resolve_method(klass, sel)) {
		goto recache;
	    }
#endif

	    // Does the receiver implements -forwardInvocation:?
	    if ((opt & DISPATCH_SUPER) == 0
		    && rb_objc_supports_forwarding(self, sel)) {

//#if MAC_OS_X_VERSION_MAX_ALLOWED < 1070
		// In earlier versions of the Objective-C runtime, there seems
		// to be a bug where class_getInstanceMethod isn't atomic,
		// and might return NULL while at the exact same time another
		// thread registers the related method.
		// As a work-around, we double-check if the method still does
		// not exist here. If he does, we can dispatch it properly.

		// note: OS X 10.7 also, this workaround is required. see #1476
		method = class_getInstanceMethod(klass, sel);
		if (method != NULL) {
		    goto recache2;
		}
//#endif
		fill_ocache(cache, self, klass, (IMP)objc_msgSend, sel, NULL,
			argc);
		goto dispatch;
	    }

	    // Let's see if are not trying to call a Ruby method that accepts
	    // a regular argument then an optional Hash argument, to be
	    // compatible with the Ruby specification.
	    const char *selname = (const char *)sel;
	    size_t selname_len = strlen(selname);
	    if (argc > 1) {
		const char *p = strchr(selname, ':');
		if (p != NULL && p + 1 != '\0') {
		    char *tmp = (char *)malloc(selname_len + 1);
		    assert(tmp != NULL);
		    strncpy(tmp, selname, p - selname + 1);
		    tmp[p - selname + 1] = '\0';
		    sel = sel_registerName(tmp);
		    VALUE h = rb_hash_new();
		    bool ok = true;
		    p += 1;
		    for (int i = 1; i < argc; i++) {
			const char *p2 = strchr(p, ':');
			if (p2 == NULL) {
			    ok = false;
			    break;
			}
			strlcpy(tmp, p, selname_len);
			tmp[p2 - p] = '\0';
			p = p2 + 1; 
			rb_hash_aset(h, ID2SYM(rb_intern(tmp)), argv[i]);
		    }
		    free(tmp);
		    tmp = NULL;
		    if (ok) {
			argc = 2;
			((VALUE *)argv)[1] = h; // bad, I know...
			Method m = class_getInstanceMethod(klass, sel);
			if (m != NULL) {	
			    method = m;
			    cache_method = false;
			    goto recache2;
			}
		    }
		}
	    }

	    // Enable helpers for classes which are not RubyObject based.
	    if ((RCLASS_VERSION(klass) & RCLASS_IS_OBJECT_SUBCLASS)
		    != RCLASS_IS_OBJECT_SUBCLASS) {
		// Let's try to see if we are not given a helper selector.
		SEL new_sel = helper_sel(selname, selname_len);
		if (new_sel != NULL) {
		    Method m = class_getInstanceMethod(klass, new_sel);
		    if (m != NULL) {
		    	sel = new_sel;
		    	method = m;
		    	// We need to invert arguments because
		    	// #[]= and setObject:forKey: take arguments
		    	// in a reverse order
		    	if (new_sel == selSetObjectForKey && argc == 2) {
		    	    VALUE swap = argv[0];
		    	    ((VALUE *)argv)[0] = argv[1];
		    	    ((VALUE *)argv)[1] = swap;
		    	    cache_method = false;
		    	}
		    	goto recache2;
		    }
		}
	    }

	    // Let's see if we are not trying to call a BridgeSupport function.
	    if (selname[selname_len - 1] == ':') {
		selname_len--;
	    }
	    std::string name(selname, selname_len);
	    bs_element_function_t *bs_func = GET_CORE()->find_bs_function(name);
	    if (bs_func != NULL) {
		if ((unsigned)argc < bs_func->args_count
			|| ((unsigned)argc > bs_func->args_count
				&& bs_func->variadic == false)) {
		    rb_raise(rb_eArgError, "wrong number of arguments (%d for %d)",
			argc, bs_func->args_count);
		}
		std::string types;
		vm_gen_bs_func_types(argc, argv, bs_func, types);

		cache->flag = MCACHE_FCALL;
		cache->sel = sel;
		cache->klass = klass;
		cache->as.fcall.bs_function = bs_func;
		cache->as.fcall.imp = (IMP)dlsym(RTLD_DEFAULT, bs_func->name);
		assert(cache->as.fcall.imp != NULL);
		cache->as.fcall.stub = (rb_vm_c_stub_t *)GET_CORE()->gen_stub(
			types, bs_func->variadic, bs_func->args_count, false);
	    }
	    else {
		// Still nothing, then let's call #method_missing.
		goto call_method_missing;
	    }
	}
    }

dispatch:
    if (cache->flag & MCACHE_RCALL) {
	if (!cache_method) {
	    cache->flag = 0;
	}

#if ROXOR_VM_DEBUG
	printf("ruby dispatch %c[<%s %p> %s] (imp %p block %p argc %d opt %d cache %p cached %s)\n",
		class_isMetaClass(klass) ? '+' : '-',
		class_getName(klass),
		(void *)self,
		sel_getName(sel),
		cache->as.rcall.node->ruby_imp,
		block,
		argc,
		opt,
		cache,
		cached ? "true" : "false");
#endif

	bool block_already_current = vm->is_block_current(block);
	Class current_klass = vm->get_current_class();
	if (!block_already_current) {
	    vm->add_current_block(block);
	}
	vm->set_current_class(NULL);

	Class old_current_super_class = vm->get_current_super_class();
	vm->set_current_super_class(current_super_class);
	SEL old_current_super_sel = vm->get_current_super_sel();
	vm->set_current_super_sel(current_super_sel);

	const bool should_pop_broken_with =
	    sel != selInitialize && sel != selInitialize2;

	struct Finally {
	    bool block_already_current;
	    Class current_class;
	    Class current_super_class;
	    SEL current_super_sel;
	    bool should_pop_broken_with;
	    RoxorVM *vm;
	    Finally(bool _block_already_current, Class _current_class,
		    Class _current_super_class, SEL _current_super_sel,
		    bool _should_pop_broken_with, RoxorVM *_vm) {
		block_already_current = _block_already_current;
		current_class = _current_class;
		current_super_class = _current_super_class;
		current_super_sel = _current_super_sel;
		should_pop_broken_with = _should_pop_broken_with;
		vm = _vm;
	    }
	    ~Finally() {
		if (!block_already_current) {
		    vm->pop_current_block();
		}
		vm->set_current_class(current_class);
		if (should_pop_broken_with) {
		    vm->pop_broken_with();
		}
		vm->set_current_super_class(current_super_class);
		vm->set_current_super_sel(current_super_sel);
		vm->pop_current_binding();
	    }
	} finalizer(block_already_current, current_klass,
		old_current_super_class, old_current_super_sel,
		should_pop_broken_with, vm);

	// DTrace probe: method__entry
	if (MACRUBY_METHOD_ENTRY_ENABLED()) {
	    char *class_name = (char *)rb_class2name((VALUE)klass);
	    char *method_name = (char *)sel_getName(sel);
	    char file[PATH_MAX];
	    unsigned long line = 0;
	    GET_CORE()->symbolize_backtrace_entry(1, file, sizeof file, &line,
		    NULL, 0);
	    MACRUBY_METHOD_ENTRY(class_name, method_name, file, line);
	}

	VALUE v = ruby_dispatch(top, self, sel, cache->as.rcall.node,
		opt, argc, argv);

	// DTrace probe: method__return
	if (MACRUBY_METHOD_RETURN_ENABLED()) {
	    char *class_name = (char *)rb_class2name((VALUE)klass);
	    char *method_name = (char *)sel_getName(sel);
	    char file[PATH_MAX];
	    unsigned long line = 0;
	    GET_CORE()->symbolize_backtrace_entry(1, file, sizeof file, &line,
		    NULL, 0);
	    MACRUBY_METHOD_RETURN(class_name, method_name, file, line);
	}

	return v;
    }
    else if (cache->flag & MCACHE_OCALL) {
	if (cache->as.ocall.argc != argc) {
	    goto recache;
	}
	if (!cache_method) {
	    cache->flag = 0;
	}

	if (block != NULL) {
	    rb_warn("passing a block to an Objective-C method - " \
		    "will be ignored");
	}
	else if (sel == selNew) {
	    if (self == rb_cNSMutableArray) {
		self = rb_cRubyArray;
	    }
	}
	else if (sel == selClass) {
	    // Because +[NSObject class] returns self.
	    if (RCLASS_META(klass)) {
		return RCLASS_MODULE(self) ? rb_cModule : rb_cClass;
	    }
	    // Because the CF classes should be hidden, for Ruby compat.
	    if (self == Qnil) {
		return rb_cNilClass;
	    }
	    if (self == Qtrue) {
		return rb_cTrueClass;
	    }
	    if (self == Qfalse) {
		return rb_cFalseClass;
	    }
	    return rb_class_real((VALUE)klass, true);
	}

#if ROXOR_VM_DEBUG
	printf("objc dispatch %c[<%s %p> %s] imp=%p cache=%p argc=%d (cached=%s)\n",
		class_isMetaClass(klass) ? '+' : '-',
		class_getName(klass),
		(void *)self,
		sel_getName(sel),
		cache->as.ocall.imp,
		cache,
		argc,
		cached ? "true" : "false");
#endif

	id ocrcv = RB2OC(self);

 	if (cache->as.ocall.bs_method != NULL) {
	    Class ocklass = object_getClass(ocrcv);
	    for (int i = 0; i < (int)cache->as.ocall.bs_method->args_count;
		    i++) {
		bs_element_arg_t *arg = &cache->as.ocall.bs_method->args[i];
		if (arg->sel_of_type != NULL) {
		    // BridgeSupport tells us that this argument contains a
		    // selector of the given type, but we don't have any
		    // information regarding the target. RubyCocoa and the
		    // other ObjC bridges do not really require it since they
		    // use the NSObject message forwarding mechanism, but
		    // MacRuby registers all methods in the runtime.
		    //
		    // Therefore, we apply here a naive heuristic by assuming
		    // that either the receiver or one of the arguments of this
		    // call is the future target.
		    const int arg_i = arg->index;
		    assert(arg_i >= 0 && arg_i < argc);
		    if (argv[arg_i] != Qnil) {
			ID arg_selid = rb_to_id(argv[arg_i]);
			SEL arg_sel = sel_registerName(rb_id2name(arg_selid));

			if (reinstall_method_maybe(ocklass, arg_sel,
				    arg->sel_of_type)) {
			    goto sel_target_found;
			}
			for (int j = 0; j < argc; j++) {
			    if (j != arg_i && !SPECIAL_CONST_P(argv[j])) {
				if (reinstall_method_maybe(*(Class *)argv[j],
					    arg_sel, arg->sel_of_type)) {
				    goto sel_target_found;
				}
			    }
			}
		    }

sel_target_found:
		    // There can only be one sel_of_type argument.
		    break; 
		}
	    }
	}

	return __rb_vm_objc_dispatch(cache->as.ocall.stub, cache->as.ocall.imp,
		ocrcv, sel, argc, argv);
    }
    else if (cache->flag & MCACHE_FCALL) {
#if ROXOR_VM_DEBUG
	printf("C dispatch %s() imp=%p argc=%d (cached=%s)\n",
		cache->as.fcall.bs_function->name,
		cache->as.fcall.imp,
		argc,
		cached ? "true" : "false");
#endif
	return (*cache->as.fcall.stub)(cache->as.fcall.imp, argc, argv);
    }

    printf("method dispatch is b0rked\n");
    abort();

call_method_missing:
    // Before calling method_missing, let's check if we are not in the following
    // cases:
    //
    //    def foo; end; foo(42)
    //    def foo(x); end; foo
    //
    // If yes, we need to raise an ArgumentError exception instead.
    const char *selname = sel_getName(sel);
    const size_t selname_len = strlen(selname);
    SEL new_sel = 0;

    if (argc > 0 && selname[selname_len - 1] == ':') {
	char buf[100];
	assert(sizeof buf > selname_len - 1);
	strlcpy(buf, selname, sizeof buf);
	buf[selname_len - 1] = '\0';
	new_sel = sel_registerName(buf);
    }
    else if (argc == 0) {
	char buf[100];
	snprintf(buf, sizeof buf, "%s:", selname);
	new_sel = sel_registerName(buf);
    }
    if (new_sel != 0) {
	Method m = class_getInstanceMethod(klass, new_sel);
	if (m != NULL) {
	    IMP mimp = method_getImplementation(m);
	    if (!UNAVAILABLE_IMP(mimp)) {
		unsigned expected_argc;
		rb_vm_method_node_t *node = GET_CORE()->method_node_get(m);
		if (node != NULL) {
		    expected_argc = node->arity.min;
		}
		else {
		    expected_argc = rb_method_getNumberOfArguments(m);
		    expected_argc -= 2; // removing receiver and selector
		}
		rb_raise(rb_eArgError, "wrong number of arguments (%d for %d)",
			argc, expected_argc);
	    }
	}
    }

    rb_vm_method_missing_reason_t status;
    if (opt & DISPATCH_VCALL) {
	status = METHOD_MISSING_VCALL;
    }
    else if (opt & DISPATCH_SUPER) {
	status = METHOD_MISSING_SUPER;
    }
    else {
	status = METHOD_MISSING_DEFAULT;
    }
    return method_missing((VALUE)self, sel, block, argc, argv, status);
}
コード例 #14
0
ファイル: set.c プロジェクト: alloy/mr-experimental
static VALUE
rb_set_equal(VALUE set, SEL sel, VALUE other)
{
    return CFEqual((CFTypeRef)set, (CFTypeRef)RB2OC(other)) ? Qtrue : Qfalse;
}
コード例 #15
0
ファイル: set.c プロジェクト: alloy/mr-experimental
static VALUE
rb_set_include(VALUE set, SEL sel, VALUE obj)
{
    return CFSetContainsValue((CFMutableSetRef)set, (const void *)RB2OC(obj)) ? Qtrue : Qfalse;
}
コード例 #16
0
ファイル: generator.c プロジェクト: alloy/mr-experimental
/*
 * call-seq: configure(opts)
 *
 * Configure this State instance with the Hash _opts_, and return
 * itself.
 */
static inline VALUE cState_configure(VALUE self, VALUE opts)
{
    VALUE tmp;
    GET_STATE(self);
    tmp = rb_convert_type(opts, T_HASH, "Hash", "to_hash");
    if (NIL_P(tmp)) tmp = rb_convert_type(opts, T_HASH, "Hash", "to_h");
    if (NIL_P(tmp)) {
        rb_raise(rb_eArgError, "opts has to be hash like or convertable into a hash");
    }
    opts = tmp;
    tmp = rb_hash_aref(opts, ID2SYM(i_indent));
    if (RTEST(tmp)) {
        Check_Type(tmp, T_STRING);
        state->indent = tmp;
    }
    tmp = rb_hash_aref(opts, ID2SYM(i_space));
    if (RTEST(tmp)) {
        Check_Type(tmp, T_STRING);
        state->space = tmp;
    }
    tmp = rb_hash_aref(opts, ID2SYM(i_space_before));
    if (RTEST(tmp)) {
        Check_Type(tmp, T_STRING);
        state->space_before = tmp;
    }
    tmp = rb_hash_aref(opts, ID2SYM(i_array_nl));
    if (RTEST(tmp)) {
        Check_Type(tmp, T_STRING);
        state->array_nl = tmp;
    }
    tmp = rb_hash_aref(opts, ID2SYM(i_object_nl));
    if (RTEST(tmp)) {
        Check_Type(tmp, T_STRING);
        state->object_nl = tmp;
    }
    tmp = ID2SYM(i_check_circular);

#if WITH_OBJC
    if (CFDictionaryGetValueIfPresent((CFDictionaryRef)opts, (const void *)RB2OC(tmp), 0)) {
#else
    if (st_lookup(RHASH_TBL(opts), tmp, 0)) {
#endif
        tmp = rb_hash_aref(opts, ID2SYM(i_check_circular));
        state->check_circular = RTEST(tmp);
    } else {
        state->check_circular = 1;
    }
    tmp = ID2SYM(i_max_nesting);
    state->max_nesting = 19;
#if WITH_OBJC
    if (CFDictionaryGetValueIfPresent((CFDictionaryRef)opts, (const void *)RB2OC(tmp), 0)) {
#else
    if (st_lookup(RHASH_TBL(opts), tmp, 0)) {
#endif
        VALUE max_nesting = rb_hash_aref(opts, tmp);
        if (RTEST(max_nesting)) {
            Check_Type(max_nesting, T_FIXNUM);
            state->max_nesting = FIX2LONG(max_nesting);
        } else {
            state->max_nesting = 0;
        }
    }
    tmp = rb_hash_aref(opts, ID2SYM(i_allow_nan));
    state->allow_nan = RTEST(tmp);
    return self;
}

/*
 * call-seq: to_h
 *
 * Returns the configuration instance variables as a hash, that can be
 * passed to the configure method.
 */
static VALUE cState_to_h(VALUE self)
{
    VALUE result = rb_hash_new();
    GET_STATE(self);
    rb_hash_aset(result, ID2SYM(i_indent), state->indent);
    rb_hash_aset(result, ID2SYM(i_space), state->space);
    rb_hash_aset(result, ID2SYM(i_space_before), state->space_before);
    rb_hash_aset(result, ID2SYM(i_object_nl), state->object_nl);
    rb_hash_aset(result, ID2SYM(i_array_nl), state->array_nl);
    rb_hash_aset(result, ID2SYM(i_check_circular), state->check_circular ? Qtrue : Qfalse);
    rb_hash_aset(result, ID2SYM(i_allow_nan), state->allow_nan ? Qtrue : Qfalse);
    rb_hash_aset(result, ID2SYM(i_max_nesting), LONG2FIX(state->max_nesting));
    return result;
}


/*
 * call-seq: new(opts = {})
 *
 * Instantiates a new State object, configured by _opts_.
 *
 * _opts_ can have the following keys:
 *
 * * *indent*: a string used to indent levels (default: ''),
 * * *space*: a string that is put after, a : or , delimiter (default: ''),
 * * *space_before*: a string that is put before a : pair delimiter (default: ''),
 * * *object_nl*: a string that is put at the end of a JSON object (default: ''), 
 * * *array_nl*: a string that is put at the end of a JSON array (default: ''),
 * * *check_circular*: true if checking for circular data structures
 *   should be done, false (the default) otherwise.
 * * *allow_nan*: true if NaN, Infinity, and -Infinity should be
 *   generated, otherwise an exception is thrown, if these values are
 *   encountered. This options defaults to false.
 */
static VALUE cState_initialize(int argc, VALUE *argv, VALUE self)
{
    VALUE opts;
    GET_STATE(self);

    rb_scan_args(argc, argv, "01", &opts);
    state->indent = rb_str_new2("");
    state->space = rb_str_new2("");
    state->space_before = rb_str_new2("");
    state->array_nl = rb_str_new2("");
    state->object_nl = rb_str_new2("");
    if (NIL_P(opts)) {
        state->check_circular = 1;
        state->allow_nan = 0;
        state->max_nesting = 19;
    } else {
        cState_configure(self, opts);
    }
    state->seen = rb_hash_new();
    state->memo = Qnil;
    state->depth = INT2FIX(0);
    return self;
}