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ruby--ruby/struct.c
Jeremy Evans ffd0820ab3 Deprecate taint/trust and related methods, and make the methods no-ops 
This removes the related tests, and puts the related specs behind
version guards.  This affects all code in lib, including some
libraries that may want to support older versions of Ruby.
2019-11-18 01:00:25 +02:00

1397 lines
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/**********************************************************************
struct.c -
$Author$
created at: Tue Mar 22 18:44:30 JST 1995
Copyright (C) 1993-2007 Yukihiro Matsumoto
**********************************************************************/
#include "internal.h"
#include "vm_core.h"
#include "id.h"
#include "transient_heap.h"
/* only for struct[:field] access */
enum {
AREF_HASH_UNIT = 5,
AREF_HASH_THRESHOLD = 10
};
const rb_iseq_t *rb_method_for_self_aref(VALUE name, VALUE arg, rb_insn_func_t func);
const rb_iseq_t *rb_method_for_self_aset(VALUE name, VALUE arg, rb_insn_func_t func);
VALUE rb_cStruct;
static ID id_members, id_back_members, id_keyword_init;
static VALUE struct_alloc(VALUE);
static inline VALUE
struct_ivar_get(VALUE c, ID id)
{
VALUE orig = c;
VALUE ivar = rb_attr_get(c, id);
if (!NIL_P(ivar))
return ivar;
for (;;) {
c = RCLASS_SUPER(c);
if (c == 0 || c == rb_cStruct)
return Qnil;
ivar = rb_attr_get(c, id);
if (!NIL_P(ivar)) {
return rb_ivar_set(orig, id, ivar);
}
}
}
VALUE
rb_struct_s_keyword_init(VALUE klass)
{
return struct_ivar_get(klass, id_keyword_init);
}
VALUE
rb_struct_s_members(VALUE klass)
{
VALUE members = struct_ivar_get(klass, id_members);
if (NIL_P(members)) {
rb_raise(rb_eTypeError, "uninitialized struct");
}
if (!RB_TYPE_P(members, T_ARRAY)) {
rb_raise(rb_eTypeError, "corrupted struct");
}
return members;
}
VALUE
rb_struct_members(VALUE s)
{
VALUE members = rb_struct_s_members(rb_obj_class(s));
if (RSTRUCT_LEN(s) != RARRAY_LEN(members)) {
rb_raise(rb_eTypeError, "struct size differs (%ld required %ld given)",
RARRAY_LEN(members), RSTRUCT_LEN(s));
}
return members;
}
static long
struct_member_pos_ideal(VALUE name, long mask)
{
/* (id & (mask/2)) * 2 */
return (SYM2ID(name) >> (ID_SCOPE_SHIFT - 1)) & mask;
}
static long
struct_member_pos_probe(long prev, long mask)
{
/* (((prev/2) * AREF_HASH_UNIT + 1) & (mask/2)) * 2 */
return (prev * AREF_HASH_UNIT + 2) & mask;
}
static VALUE
struct_set_members(VALUE klass, VALUE /* frozen hidden array */ members)
{
VALUE back;
const long members_length = RARRAY_LEN(members);
if (members_length <= AREF_HASH_THRESHOLD) {
back = members;
}
else {
long i, j, mask = 64;
VALUE name;
while (mask < members_length * AREF_HASH_UNIT) mask *= 2;
back = rb_ary_tmp_new(mask + 1);
rb_ary_store(back, mask, INT2FIX(members_length));
mask -= 2; /* mask = (2**k-1)*2 */
for (i=0; i < members_length; i++) {
name = RARRAY_AREF(members, i);
j = struct_member_pos_ideal(name, mask);
for (;;) {
if (!RTEST(RARRAY_AREF(back, j))) {
rb_ary_store(back, j, name);
rb_ary_store(back, j + 1, INT2FIX(i));
break;
}
j = struct_member_pos_probe(j, mask);
}
}
OBJ_FREEZE_RAW(back);
}
rb_ivar_set(klass, id_members, members);
rb_ivar_set(klass, id_back_members, back);
return members;
}
static inline int
struct_member_pos(VALUE s, VALUE name)
{
VALUE back = struct_ivar_get(rb_obj_class(s), id_back_members);
long j, mask;
if (UNLIKELY(NIL_P(back))) {
rb_raise(rb_eTypeError, "uninitialized struct");
}
if (UNLIKELY(!RB_TYPE_P(back, T_ARRAY))) {
rb_raise(rb_eTypeError, "corrupted struct");
}
mask = RARRAY_LEN(back);
if (mask <= AREF_HASH_THRESHOLD) {
if (UNLIKELY(RSTRUCT_LEN(s) != mask)) {
rb_raise(rb_eTypeError,
"struct size differs (%ld required %ld given)",
mask, RSTRUCT_LEN(s));
}
for (j = 0; j < mask; j++) {
if (RARRAY_AREF(back, j) == name)
return (int)j;
}
return -1;
}
if (UNLIKELY(RSTRUCT_LEN(s) != FIX2INT(RARRAY_AREF(back, mask-1)))) {
rb_raise(rb_eTypeError, "struct size differs (%d required %ld given)",
FIX2INT(RARRAY_AREF(back, mask-1)), RSTRUCT_LEN(s));
}
mask -= 3;
j = struct_member_pos_ideal(name, mask);
for (;;) {
VALUE e = RARRAY_AREF(back, j);
if (e == name)
return FIX2INT(RARRAY_AREF(back, j + 1));
if (!RTEST(e)) {
return -1;
}
j = struct_member_pos_probe(j, mask);
}
}
static VALUE
rb_struct_s_members_m(VALUE klass)
{
VALUE members = rb_struct_s_members(klass);
return rb_ary_dup(members);
}
/*
* call-seq:
* struct.members -> array
*
* Returns the struct members as an array of symbols:
*
* Customer = Struct.new(:name, :address, :zip)
* joe = Customer.new("Joe Smith", "123 Maple, Anytown NC", 12345)
* joe.members #=> [:name, :address, :zip]
*/
static VALUE
rb_struct_members_m(VALUE obj)
{
return rb_struct_s_members_m(rb_obj_class(obj));
}
VALUE
rb_struct_getmember(VALUE obj, ID id)
{
VALUE slot = ID2SYM(id);
int i = struct_member_pos(obj, slot);
if (i != -1) {
return RSTRUCT_GET(obj, i);
}
rb_name_err_raise("`%1$s' is not a struct member", obj, ID2SYM(id));
UNREACHABLE_RETURN(Qnil);
}
static VALUE rb_struct_ref0(VALUE obj) {return RSTRUCT_GET(obj, 0);}
static VALUE rb_struct_ref1(VALUE obj) {return RSTRUCT_GET(obj, 1);}
static VALUE rb_struct_ref2(VALUE obj) {return RSTRUCT_GET(obj, 2);}
static VALUE rb_struct_ref3(VALUE obj) {return RSTRUCT_GET(obj, 3);}
static VALUE rb_struct_ref4(VALUE obj) {return RSTRUCT_GET(obj, 4);}
static VALUE rb_struct_ref5(VALUE obj) {return RSTRUCT_GET(obj, 5);}
static VALUE rb_struct_ref6(VALUE obj) {return RSTRUCT_GET(obj, 6);}
static VALUE rb_struct_ref7(VALUE obj) {return RSTRUCT_GET(obj, 7);}
static VALUE rb_struct_ref8(VALUE obj) {return RSTRUCT_GET(obj, 8);}
static VALUE rb_struct_ref9(VALUE obj) {return RSTRUCT_GET(obj, 9);}
#define N_REF_FUNC numberof(ref_func)
static VALUE (*const ref_func[])(VALUE) = {
rb_struct_ref0,
rb_struct_ref1,
rb_struct_ref2,
rb_struct_ref3,
rb_struct_ref4,
rb_struct_ref5,
rb_struct_ref6,
rb_struct_ref7,
rb_struct_ref8,
rb_struct_ref9,
};
static void
rb_struct_modify(VALUE s)
{
rb_check_frozen(s);
}
static VALUE
anonymous_struct(VALUE klass)
{
VALUE nstr;
nstr = rb_class_new(klass);
rb_make_metaclass(nstr, RBASIC(klass)->klass);
rb_class_inherited(klass, nstr);
return nstr;
}
static VALUE
new_struct(VALUE name, VALUE super)
{
/* old style: should we warn? */
ID id;
name = rb_str_to_str(name);
if (!rb_is_const_name(name)) {
rb_name_err_raise("identifier %1$s needs to be constant",
super, name);
}
id = rb_to_id(name);
if (rb_const_defined_at(super, id)) {
rb_warn("redefining constant %"PRIsVALUE"::%"PRIsVALUE, super, name);
rb_mod_remove_const(super, ID2SYM(id));
}
return rb_define_class_id_under(super, id, super);
}
static void
define_aref_method(VALUE nstr, VALUE name, VALUE off)
{
rb_control_frame_t *FUNC_FASTCALL(rb_vm_opt_struct_aref)(rb_execution_context_t *, rb_control_frame_t *);
const rb_iseq_t *iseq = rb_method_for_self_aref(name, off, rb_vm_opt_struct_aref);
rb_add_method_iseq(nstr, SYM2ID(name), iseq, NULL, METHOD_VISI_PUBLIC);
}
static void
define_aset_method(VALUE nstr, VALUE name, VALUE off)
{
rb_control_frame_t *FUNC_FASTCALL(rb_vm_opt_struct_aset)(rb_execution_context_t *, rb_control_frame_t *);
const rb_iseq_t *iseq = rb_method_for_self_aset(name, off, rb_vm_opt_struct_aset);
rb_add_method_iseq(nstr, SYM2ID(name), iseq, NULL, METHOD_VISI_PUBLIC);
}
static VALUE
rb_struct_s_inspect(VALUE klass)
{
VALUE inspect = rb_class_name(klass);
if (RTEST(rb_struct_s_keyword_init(klass))) {
rb_str_cat_cstr(inspect, "(keyword_init: true)");
}
return inspect;
}
static VALUE
struct_new_kw(int argc, const VALUE *argv, VALUE klass)
{
return rb_class_new_instance_kw(argc, argv, klass, RB_PASS_CALLED_KEYWORDS);
}
static VALUE
setup_struct(VALUE nstr, VALUE members, int keyword_init)
{
long i, len;
VALUE (*new_func)(int, const VALUE *, VALUE) = rb_class_new_instance;
if (keyword_init) new_func = struct_new_kw;
members = struct_set_members(nstr, members);
rb_define_alloc_func(nstr, struct_alloc);
rb_define_singleton_method(nstr, "new", new_func, -1);
rb_define_singleton_method(nstr, "[]", new_func, -1);
rb_define_singleton_method(nstr, "members", rb_struct_s_members_m, 0);
rb_define_singleton_method(nstr, "inspect", rb_struct_s_inspect, 0);
len = RARRAY_LEN(members);
for (i=0; i< len; i++) {
VALUE sym = RARRAY_AREF(members, i);
ID id = SYM2ID(sym);
VALUE off = LONG2NUM(i);
if (i < N_REF_FUNC) {
rb_define_method_id(nstr, id, ref_func[i], 0);
}
else {
define_aref_method(nstr, sym, off);
}
define_aset_method(nstr, ID2SYM(rb_id_attrset(id)), off);
}
return nstr;
}
VALUE
rb_struct_alloc_noinit(VALUE klass)
{
return struct_alloc(klass);
}
static VALUE
struct_make_members_list(va_list ar)
{
char *mem;
VALUE ary, list = rb_ident_hash_new();
st_table *tbl = RHASH_TBL(list);
RBASIC_CLEAR_CLASS(list);
while ((mem = va_arg(ar, char*)) != 0) {
VALUE sym = rb_sym_intern_ascii_cstr(mem);
if (st_insert(tbl, sym, Qtrue)) {
rb_raise(rb_eArgError, "duplicate member: %s", mem);
}
}
ary = rb_hash_keys(list);
st_clear(tbl);
RBASIC_CLEAR_CLASS(ary);
OBJ_FREEZE_RAW(ary);
return ary;
}
static VALUE
struct_define_without_accessor(VALUE outer, const char *class_name, VALUE super, rb_alloc_func_t alloc, VALUE members)
{
VALUE klass;
if (class_name) {
if (outer) {
klass = rb_define_class_under(outer, class_name, super);
}
else {
klass = rb_define_class(class_name, super);
}
}
else {
klass = anonymous_struct(super);
}
struct_set_members(klass, members);
if (alloc) {
rb_define_alloc_func(klass, alloc);
}
else {
rb_define_alloc_func(klass, struct_alloc);
}
return klass;
}
VALUE
rb_struct_define_without_accessor_under(VALUE outer, const char *class_name, VALUE super, rb_alloc_func_t alloc, ...)
{
va_list ar;
VALUE members;
va_start(ar, alloc);
members = struct_make_members_list(ar);
va_end(ar);
return struct_define_without_accessor(outer, class_name, super, alloc, members);
}
VALUE
rb_struct_define_without_accessor(const char *class_name, VALUE super, rb_alloc_func_t alloc, ...)
{
va_list ar;
VALUE members;
va_start(ar, alloc);
members = struct_make_members_list(ar);
va_end(ar);
return struct_define_without_accessor(0, class_name, super, alloc, members);
}
VALUE
rb_struct_define(const char *name, ...)
{
va_list ar;
VALUE st, ary;
va_start(ar, name);
ary = struct_make_members_list(ar);
va_end(ar);
if (!name) st = anonymous_struct(rb_cStruct);
else st = new_struct(rb_str_new2(name), rb_cStruct);
return setup_struct(st, ary, 0);
}
VALUE
rb_struct_define_under(VALUE outer, const char *name, ...)
{
va_list ar;
VALUE ary;
va_start(ar, name);
ary = struct_make_members_list(ar);
va_end(ar);
return setup_struct(rb_define_class_under(outer, name, rb_cStruct), ary, 0);
}
/*
* call-seq:
* Struct.new([class_name] [, member_name]+) -> StructClass
* Struct.new([class_name] [, member_name]+, keyword_init: true) -> StructClass
* Struct.new([class_name] [, member_name]+) {|StructClass| block } -> StructClass
* StructClass.new(value, ...) -> object
* StructClass[value, ...] -> object
*
* The first two forms are used to create a new Struct subclass +class_name+
* that can contain a value for each +member_name+. This subclass can be
* used to create instances of the structure like any other Class.
*
* If the +class_name+ is omitted an anonymous structure class will be
* created. Otherwise, the name of this struct will appear as a constant in
* class Struct, so it must be unique for all Structs in the system and
* must start with a capital letter. Assigning a structure class to a
* constant also gives the class the name of the constant.
*
* # Create a structure with a name under Struct
* Struct.new("Customer", :name, :address)
* #=> Struct::Customer
* Struct::Customer.new("Dave", "123 Main")
* #=> #<struct Struct::Customer name="Dave", address="123 Main">
*
* # Create a structure named by its constant
* Customer = Struct.new(:name, :address)
* #=> Customer
* Customer.new("Dave", "123 Main")
* #=> #<struct Customer name="Dave", address="123 Main">
*
* If the optional +keyword_init+ keyword argument is set to +true+,
* .new takes keyword arguments instead of normal arguments.
*
* Customer = Struct.new(:name, :address, keyword_init: true)
* Customer.new(name: "Dave", address: "123 Main")
* #=> #<struct Customer name="Dave", address="123 Main">
*
* If a block is given it will be evaluated in the context of
* +StructClass+, passing the created class as a parameter:
*
* Customer = Struct.new(:name, :address) do
* def greeting
* "Hello #{name}!"
* end
* end
* Customer.new("Dave", "123 Main").greeting #=> "Hello Dave!"
*
* This is the recommended way to customize a struct. Subclassing an
* anonymous struct creates an extra anonymous class that will never be used.
*
* The last two forms create a new instance of a struct subclass. The number
* of +value+ parameters must be less than or equal to the number of
* attributes defined for the structure. Unset parameters default to +nil+.
* Passing more parameters than number of attributes will raise
* an ArgumentError.
*
* Customer = Struct.new(:name, :address)
* Customer.new("Dave", "123 Main")
* #=> #<struct Customer name="Dave", address="123 Main">
* Customer["Dave"]
* #=> #<struct Customer name="Dave", address=nil>
*/
static VALUE
rb_struct_s_def(int argc, VALUE *argv, VALUE klass)
{
VALUE name, rest, keyword_init = Qfalse;
long i;
VALUE st;
st_table *tbl;
rb_check_arity(argc, 1, UNLIMITED_ARGUMENTS);
name = argv[0];
if (SYMBOL_P(name)) {
name = Qnil;
}
else {
--argc;
++argv;
}
if (RB_TYPE_P(argv[argc-1], T_HASH)) {
static ID keyword_ids[1];
if (!keyword_ids[0]) {
keyword_ids[0] = rb_intern("keyword_init");
}
rb_get_kwargs(argv[argc-1], keyword_ids, 0, 1, &keyword_init);
if (keyword_init == Qundef) {
keyword_init = Qfalse;
}
--argc;
}
rest = rb_ident_hash_new();
RBASIC_CLEAR_CLASS(rest);
tbl = RHASH_TBL(rest);
for (i=0; i<argc; i++) {
VALUE mem = rb_to_symbol(argv[i]);
if (rb_is_attrset_sym(mem)) {
rb_raise(rb_eArgError, "invalid struct member: %"PRIsVALUE, mem);
}
if (st_insert(tbl, mem, Qtrue)) {
rb_raise(rb_eArgError, "duplicate member: %"PRIsVALUE, mem);
}
}
rest = rb_hash_keys(rest);
st_clear(tbl);
RBASIC_CLEAR_CLASS(rest);
OBJ_FREEZE_RAW(rest);
if (NIL_P(name)) {
st = anonymous_struct(klass);
}
else {
st = new_struct(name, klass);
}
setup_struct(st, rest, (int)keyword_init);
rb_ivar_set(st, id_keyword_init, keyword_init);
if (rb_block_given_p()) {
rb_mod_module_eval(0, 0, st);
}
return st;
}
static long
num_members(VALUE klass)
{
VALUE members;
members = struct_ivar_get(klass, id_members);
if (!RB_TYPE_P(members, T_ARRAY)) {
rb_raise(rb_eTypeError, "broken members");
}
return RARRAY_LEN(members);
}
/*
*/
struct struct_hash_set_arg {
VALUE self;
VALUE unknown_keywords;
};
static int rb_struct_pos(VALUE s, VALUE *name);
static int
struct_hash_set_i(VALUE key, VALUE val, VALUE arg)
{
struct struct_hash_set_arg *args = (struct struct_hash_set_arg *)arg;
int i = rb_struct_pos(args->self, &key);
if (i < 0) {
if (args->unknown_keywords == Qnil) {
args->unknown_keywords = rb_ary_new();
}
rb_ary_push(args->unknown_keywords, key);
}
else {
rb_struct_modify(args->self);
RSTRUCT_SET(args->self, i, val);
}
return ST_CONTINUE;
}
static VALUE
rb_struct_initialize_m(int argc, const VALUE *argv, VALUE self)
{
VALUE klass = rb_obj_class(self);
long i, n;
rb_struct_modify(self);
n = num_members(klass);
if (argc > 0 && RTEST(rb_struct_s_keyword_init(klass))) {
struct struct_hash_set_arg arg;
if (argc > 1 || !RB_TYPE_P(argv[0], T_HASH)) {
rb_raise(rb_eArgError, "wrong number of arguments (given %d, expected 0)", argc);
}
rb_mem_clear((VALUE *)RSTRUCT_CONST_PTR(self), n);
arg.self = self;
arg.unknown_keywords = Qnil;
rb_hash_foreach(argv[0], struct_hash_set_i, (VALUE)&arg);
if (arg.unknown_keywords != Qnil) {
rb_raise(rb_eArgError, "unknown keywords: %s",
RSTRING_PTR(rb_ary_join(arg.unknown_keywords, rb_str_new2(", "))));
}
}
else {
if (n < argc) {
rb_raise(rb_eArgError, "struct size differs");
}
for (i=0; i<argc; i++) {
RSTRUCT_SET(self, i, argv[i]);
}
if (n > argc) {
rb_mem_clear((VALUE *)RSTRUCT_CONST_PTR(self)+argc, n-argc);
}
}
return Qnil;
}
VALUE
rb_struct_initialize(VALUE self, VALUE values)
{
return rb_struct_initialize_m(RARRAY_LENINT(values), RARRAY_CONST_PTR(values), self);
}
static VALUE *
struct_heap_alloc(VALUE st, size_t len)
{
VALUE *ptr = rb_transient_heap_alloc((VALUE)st, sizeof(VALUE) * len);
if (ptr) {
RSTRUCT_TRANSIENT_SET(st);
return ptr;
}
else {
RSTRUCT_TRANSIENT_UNSET(st);
return ALLOC_N(VALUE, len);
}
}
#if USE_TRANSIENT_HEAP
void
rb_struct_transient_heap_evacuate(VALUE obj, int promote)
{
if (RSTRUCT_TRANSIENT_P(obj)) {
const VALUE *old_ptr = rb_struct_const_heap_ptr(obj);
VALUE *new_ptr;
long len = RSTRUCT_LEN(obj);
if (promote) {
new_ptr = ALLOC_N(VALUE, len);
FL_UNSET_RAW(obj, RSTRUCT_TRANSIENT_FLAG);
}
else {
new_ptr = struct_heap_alloc(obj, len);
}
MEMCPY(new_ptr, old_ptr, VALUE, len);
RSTRUCT(obj)->as.heap.ptr = new_ptr;
}
}
#endif
static VALUE
struct_alloc(VALUE klass)
{
long n;
NEWOBJ_OF(st, struct RStruct, klass, T_STRUCT | (RGENGC_WB_PROTECTED_STRUCT ? FL_WB_PROTECTED : 0));
n = num_members(klass);
if (0 < n && n <= RSTRUCT_EMBED_LEN_MAX) {
RBASIC(st)->flags &= ~RSTRUCT_EMBED_LEN_MASK;
RBASIC(st)->flags |= n << RSTRUCT_EMBED_LEN_SHIFT;
rb_mem_clear((VALUE *)st->as.ary, n);
}
else {
st->as.heap.ptr = struct_heap_alloc((VALUE)st, n);
rb_mem_clear((VALUE *)st->as.heap.ptr, n);
st->as.heap.len = n;
}
return (VALUE)st;
}
VALUE
rb_struct_alloc(VALUE klass, VALUE values)
{
return rb_class_new_instance(RARRAY_LENINT(values), RARRAY_CONST_PTR(values), klass);
}
VALUE
rb_struct_new(VALUE klass, ...)
{
VALUE tmpargs[N_REF_FUNC], *mem = tmpargs;
int size, i;
va_list args;
size = rb_long2int(num_members(klass));
if (size > numberof(tmpargs)) {
tmpargs[0] = rb_ary_tmp_new(size);
mem = RARRAY_PTR(tmpargs[0]);
}
va_start(args, klass);
for (i=0; i<size; i++) {
mem[i] = va_arg(args, VALUE);
}
va_end(args);
return rb_class_new_instance(size, mem, klass);
}
static VALUE
struct_enum_size(VALUE s, VALUE args, VALUE eobj)
{
return rb_struct_size(s);
}
/*
* call-seq:
* struct.each {|obj| block } -> struct
* struct.each -> enumerator
*
* Yields the value of each struct member in order. If no block is given an
* enumerator is returned.
*
* Customer = Struct.new(:name, :address, :zip)
* joe = Customer.new("Joe Smith", "123 Maple, Anytown NC", 12345)
* joe.each {|x| puts(x) }
*
* Produces:
*
* Joe Smith
* 123 Maple, Anytown NC
* 12345
*/
static VALUE
rb_struct_each(VALUE s)
{
long i;
RETURN_SIZED_ENUMERATOR(s, 0, 0, struct_enum_size);
for (i=0; i<RSTRUCT_LEN(s); i++) {
rb_yield(RSTRUCT_GET(s, i));
}
return s;
}
/*
* call-seq:
* struct.each_pair {|sym, obj| block } -> struct
* struct.each_pair -> enumerator
*
* Yields the name and value of each struct member in order. If no block is
* given an enumerator is returned.
*
* Customer = Struct.new(:name, :address, :zip)
* joe = Customer.new("Joe Smith", "123 Maple, Anytown NC", 12345)
* joe.each_pair {|name, value| puts("#{name} => #{value}") }
*
* Produces:
*
* name => Joe Smith
* address => 123 Maple, Anytown NC
* zip => 12345
*/
static VALUE
rb_struct_each_pair(VALUE s)
{
VALUE members;
long i;
RETURN_SIZED_ENUMERATOR(s, 0, 0, struct_enum_size);
members = rb_struct_members(s);
if (rb_block_arity() > 1) {
for (i=0; i<RSTRUCT_LEN(s); i++) {
VALUE key = rb_ary_entry(members, i);
VALUE value = RSTRUCT_GET(s, i);
rb_yield_values(2, key, value);
}
}
else {
for (i=0; i<RSTRUCT_LEN(s); i++) {
VALUE key = rb_ary_entry(members, i);
VALUE value = RSTRUCT_GET(s, i);
rb_yield(rb_assoc_new(key, value));
}
}
return s;
}
static VALUE
inspect_struct(VALUE s, VALUE dummy, int recur)
{
VALUE cname = rb_class_path(rb_obj_class(s));
VALUE members, str = rb_str_new2("#<struct ");
long i, len;
char first = RSTRING_PTR(cname)[0];
if (recur || first != '#') {
rb_str_append(str, cname);
}
if (recur) {
return rb_str_cat2(str, ":...>");
}
members = rb_struct_members(s);
len = RSTRUCT_LEN(s);
for (i=0; i<len; i++) {
VALUE slot;
ID id;
if (i > 0) {
rb_str_cat2(str, ", ");
}
else if (first != '#') {
rb_str_cat2(str, " ");
}
slot = RARRAY_AREF(members, i);
id = SYM2ID(slot);
if (rb_is_local_id(id) || rb_is_const_id(id)) {
rb_str_append(str, rb_id2str(id));
}
else {
rb_str_append(str, rb_inspect(slot));
}
rb_str_cat2(str, "=");
rb_str_append(str, rb_inspect(RSTRUCT_GET(s, i)));
}
rb_str_cat2(str, ">");
return str;
}
/*
* call-seq:
* struct.to_s -> string
* struct.inspect -> string
*
* Returns a description of this struct as a string.
*/
static VALUE
rb_struct_inspect(VALUE s)
{
return rb_exec_recursive(inspect_struct, s, 0);
}
/*
* call-seq:
* struct.to_a -> array
* struct.values -> array
*
* Returns the values for this struct as an Array.
*
* Customer = Struct.new(:name, :address, :zip)
* joe = Customer.new("Joe Smith", "123 Maple, Anytown NC", 12345)
* joe.to_a[1] #=> "123 Maple, Anytown NC"
*/
static VALUE
rb_struct_to_a(VALUE s)
{
return rb_ary_new4(RSTRUCT_LEN(s), RSTRUCT_CONST_PTR(s));
}
/*
* call-seq:
* struct.to_h -> hash
* struct.to_h {|name, value| block } -> hash
*
* Returns a Hash containing the names and values for the struct's members.
*
* If a block is given, the results of the block on each pair of the receiver
* will be used as pairs.
*
* Customer = Struct.new(:name, :address, :zip)
* joe = Customer.new("Joe Smith", "123 Maple, Anytown NC", 12345)
* joe.to_h[:address] #=> "123 Maple, Anytown NC"
* joe.to_h{|name, value| [name.upcase, value.to_s.upcase]}[:ADDRESS]
* #=> "123 MAPLE, ANYTOWN NC"
*/
static VALUE
rb_struct_to_h(VALUE s)
{
VALUE h = rb_hash_new_with_size(RSTRUCT_LEN(s));
VALUE members = rb_struct_members(s);
long i;
int block_given = rb_block_given_p();
for (i=0; i<RSTRUCT_LEN(s); i++) {
VALUE k = rb_ary_entry(members, i), v = RSTRUCT_GET(s, i);
if (block_given)
rb_hash_set_pair(h, rb_yield_values(2, k, v));
else
rb_hash_aset(h, k, v);
}
return h;
}
static VALUE
rb_struct_deconstruct_keys(VALUE s, VALUE keys)
{
VALUE h;
long i;
if (NIL_P(keys)) {
return rb_struct_to_h(s);
}
if (UNLIKELY(!RB_TYPE_P(keys, T_ARRAY))) {
rb_raise(rb_eTypeError,
"wrong argument type %"PRIsVALUE" (expected Array or nil)",
rb_obj_class(keys));
}
h = rb_hash_new_with_size(RARRAY_LEN(keys));
for (i=0; i<RARRAY_LEN(keys); i++) {
VALUE key = RARRAY_AREF(keys, i);
int i = rb_struct_pos(s, &key);
if (i < 0) {
return rb_hash_new_with_size(0);
}
rb_hash_aset(h, key, RSTRUCT_GET(s, i));
}
return h;
}
/* :nodoc: */
VALUE
rb_struct_init_copy(VALUE copy, VALUE s)
{
long i, len;
if (!OBJ_INIT_COPY(copy, s)) return copy;
if (RSTRUCT_LEN(copy) != RSTRUCT_LEN(s)) {
rb_raise(rb_eTypeError, "struct size mismatch");
}
for (i=0, len=RSTRUCT_LEN(copy); i<len; i++) {
RSTRUCT_SET(copy, i, RSTRUCT_GET(s, i));
}
return copy;
}
static int
rb_struct_pos(VALUE s, VALUE *name)
{
long i;
VALUE idx = *name;
if (RB_TYPE_P(idx, T_SYMBOL)) {
return struct_member_pos(s, idx);
}
else if (RB_TYPE_P(idx, T_STRING)) {
idx = rb_check_symbol(name);
if (NIL_P(idx)) return -1;
return struct_member_pos(s, idx);
}
else {
long len;
i = NUM2LONG(idx);
len = RSTRUCT_LEN(s);
if (i < 0) {
if (i + len < 0) {
*name = LONG2FIX(i);
return -1;
}
i += len;
}
else if (len <= i) {
*name = LONG2FIX(i);
return -1;
}
return (int)i;
}
}
NORETURN(static void invalid_struct_pos(VALUE s, VALUE idx));
static void
invalid_struct_pos(VALUE s, VALUE idx)
{
if (FIXNUM_P(idx)) {
long i = FIX2INT(idx), len = RSTRUCT_LEN(s);
if (i < 0) {
rb_raise(rb_eIndexError, "offset %ld too small for struct(size:%ld)",
i, len);
}
else {
rb_raise(rb_eIndexError, "offset %ld too large for struct(size:%ld)",
i, len);
}
}
else {
rb_name_err_raise("no member '%1$s' in struct", s, idx);
}
}
/*
* call-seq:
* struct[member] -> object
* struct[index] -> object
*
* Attribute Reference---Returns the value of the given struct +member+ or
* the member at the given +index+. Raises NameError if the +member+ does
* not exist and IndexError if the +index+ is out of range.
*
* Customer = Struct.new(:name, :address, :zip)
* joe = Customer.new("Joe Smith", "123 Maple, Anytown NC", 12345)
*
* joe["name"] #=> "Joe Smith"
* joe[:name] #=> "Joe Smith"
* joe[0] #=> "Joe Smith"
*/
VALUE
rb_struct_aref(VALUE s, VALUE idx)
{
int i = rb_struct_pos(s, &idx);
if (i < 0) invalid_struct_pos(s, idx);
return RSTRUCT_GET(s, i);
}
/*
* call-seq:
* struct[member] = obj -> obj
* struct[index] = obj -> obj
*
* Attribute Assignment---Sets the value of the given struct +member+ or
* the member at the given +index+. Raises NameError if the +member+ does not
* exist and IndexError if the +index+ is out of range.
*
* Customer = Struct.new(:name, :address, :zip)
* joe = Customer.new("Joe Smith", "123 Maple, Anytown NC", 12345)
*
* joe["name"] = "Luke"
* joe[:zip] = "90210"
*
* joe.name #=> "Luke"
* joe.zip #=> "90210"
*/
VALUE
rb_struct_aset(VALUE s, VALUE idx, VALUE val)
{
int i = rb_struct_pos(s, &idx);
if (i < 0) invalid_struct_pos(s, idx);
rb_struct_modify(s);
RSTRUCT_SET(s, i, val);
return val;
}
FUNC_MINIMIZED(VALUE rb_struct_lookup(VALUE s, VALUE idx));
NOINLINE(static VALUE rb_struct_lookup_default(VALUE s, VALUE idx, VALUE notfound));
VALUE
rb_struct_lookup(VALUE s, VALUE idx)
{
return rb_struct_lookup_default(s, idx, Qnil);
}
static VALUE
rb_struct_lookup_default(VALUE s, VALUE idx, VALUE notfound)
{
int i = rb_struct_pos(s, &idx);
if (i < 0) return notfound;
return RSTRUCT_GET(s, i);
}
static VALUE
struct_entry(VALUE s, long n)
{
return rb_struct_aref(s, LONG2NUM(n));
}
/*
* call-seq:
* struct.values_at(selector, ...) -> array
*
* Returns the struct member values for each +selector+ as an Array. A
* +selector+ may be either an Integer offset or a Range of offsets (as in
* Array#values_at).
*
* Customer = Struct.new(:name, :address, :zip)
* joe = Customer.new("Joe Smith", "123 Maple, Anytown NC", 12345)
* joe.values_at(0, 2) #=> ["Joe Smith", 12345]
*
*/
static VALUE
rb_struct_values_at(int argc, VALUE *argv, VALUE s)
{
return rb_get_values_at(s, RSTRUCT_LEN(s), argc, argv, struct_entry);
}
/*
* call-seq:
* struct.select {|obj| block } -> array
* struct.select -> enumerator
* struct.filter {|obj| block } -> array
* struct.filter -> enumerator
*
* Yields each member value from the struct to the block and returns an Array
* containing the member values from the +struct+ for which the given block
* returns a true value (equivalent to Enumerable#select).
*
* Lots = Struct.new(:a, :b, :c, :d, :e, :f)
* l = Lots.new(11, 22, 33, 44, 55, 66)
* l.select {|v| v.even? } #=> [22, 44, 66]
*
* Struct#filter is an alias for Struct#select.
*/
static VALUE
rb_struct_select(int argc, VALUE *argv, VALUE s)
{
VALUE result;
long i;
rb_check_arity(argc, 0, 0);
RETURN_SIZED_ENUMERATOR(s, 0, 0, struct_enum_size);
result = rb_ary_new();
for (i = 0; i < RSTRUCT_LEN(s); i++) {
if (RTEST(rb_yield(RSTRUCT_GET(s, i)))) {
rb_ary_push(result, RSTRUCT_GET(s, i));
}
}
return result;
}
static VALUE
recursive_equal(VALUE s, VALUE s2, int recur)
{
long i, len;
if (recur) return Qtrue; /* Subtle! */
len = RSTRUCT_LEN(s);
for (i=0; i<len; i++) {
if (!rb_equal(RSTRUCT_GET(s, i), RSTRUCT_GET(s2, i))) return Qfalse;
}
return Qtrue;
}
/*
* call-seq:
* struct == other -> true or false
*
* Equality---Returns +true+ if +other+ has the same struct subclass and has
* equal member values (according to Object#==).
*
* Customer = Struct.new(:name, :address, :zip)
* joe = Customer.new("Joe Smith", "123 Maple, Anytown NC", 12345)
* joejr = Customer.new("Joe Smith", "123 Maple, Anytown NC", 12345)
* jane = Customer.new("Jane Doe", "456 Elm, Anytown NC", 12345)
* joe == joejr #=> true
* joe == jane #=> false
*/
static VALUE
rb_struct_equal(VALUE s, VALUE s2)
{
if (s == s2) return Qtrue;
if (!RB_TYPE_P(s2, T_STRUCT)) return Qfalse;
if (rb_obj_class(s) != rb_obj_class(s2)) return Qfalse;
if (RSTRUCT_LEN(s) != RSTRUCT_LEN(s2)) {
rb_bug("inconsistent struct"); /* should never happen */
}
return rb_exec_recursive_paired(recursive_equal, s, s2, s2);
}
/*
* call-seq:
* struct.hash -> integer
*
* Returns a hash value based on this struct's contents.
*
* See also Object#hash.
*/
static VALUE
rb_struct_hash(VALUE s)
{
long i, len;
st_index_t h;
VALUE n;
h = rb_hash_start(rb_hash(rb_obj_class(s)));
len = RSTRUCT_LEN(s);
for (i = 0; i < len; i++) {
n = rb_hash(RSTRUCT_GET(s, i));
h = rb_hash_uint(h, NUM2LONG(n));
}
h = rb_hash_end(h);
return ST2FIX(h);
}
static VALUE
recursive_eql(VALUE s, VALUE s2, int recur)
{
long i, len;
if (recur) return Qtrue; /* Subtle! */
len = RSTRUCT_LEN(s);
for (i=0; i<len; i++) {
if (!rb_eql(RSTRUCT_GET(s, i), RSTRUCT_GET(s2, i))) return Qfalse;
}
return Qtrue;
}
/*
* call-seq:
* struct.eql?(other) -> true or false
*
* Hash equality---+other+ and +struct+ refer to the same hash key if they
* have the same struct subclass and have equal member values (according to
* Object#eql?).
*/
static VALUE
rb_struct_eql(VALUE s, VALUE s2)
{
if (s == s2) return Qtrue;
if (!RB_TYPE_P(s2, T_STRUCT)) return Qfalse;
if (rb_obj_class(s) != rb_obj_class(s2)) return Qfalse;
if (RSTRUCT_LEN(s) != RSTRUCT_LEN(s2)) {
rb_bug("inconsistent struct"); /* should never happen */
}
return rb_exec_recursive_paired(recursive_eql, s, s2, s2);
}
/*
* call-seq:
* struct.length -> integer
* struct.size -> integer
*
* Returns the number of struct members.
*
* Customer = Struct.new(:name, :address, :zip)
* joe = Customer.new("Joe Smith", "123 Maple, Anytown NC", 12345)
* joe.length #=> 3
*/
VALUE
rb_struct_size(VALUE s)
{
return LONG2FIX(RSTRUCT_LEN(s));
}
/*
* call-seq:
* struct.dig(key, ...) -> object
*
* Extracts the nested value specified by the sequence of +key+
* objects by calling +dig+ at each step, returning +nil+ if any
* intermediate step is +nil+.
*
* Foo = Struct.new(:a)
* f = Foo.new(Foo.new({b: [1, 2, 3]}))
*
* f.dig(:a, :a, :b, 0) # => 1
* f.dig(:b, 0) # => nil
* f.dig(:a, :a, :b, :c) # TypeError: no implicit conversion of Symbol into Integer
*/
static VALUE
rb_struct_dig(int argc, VALUE *argv, VALUE self)
{
rb_check_arity(argc, 1, UNLIMITED_ARGUMENTS);
self = rb_struct_lookup(self, *argv);
if (!--argc) return self;
++argv;
return rb_obj_dig(argc, argv, self, Qnil);
}
/*
* Document-class: Struct
*
* A Struct is a convenient way to bundle a number of attributes together,
* using accessor methods, without having to write an explicit class.
*
* The Struct class generates new subclasses that hold a set of members and
* their values. For each member a reader and writer method is created
* similar to Module#attr_accessor.
*
* Customer = Struct.new(:name, :address) do
* def greeting
* "Hello #{name}!"
* end
* end
*
* dave = Customer.new("Dave", "123 Main")
* dave.name #=> "Dave"
* dave.greeting #=> "Hello Dave!"
*
* See Struct::new for further examples of creating struct subclasses and
* instances.
*
* In the method descriptions that follow, a "member" parameter refers to a
* struct member which is either a quoted string (<code>"name"</code>) or a
* Symbol (<code>:name</code>).
*/
void
InitVM_Struct(void)
{
rb_cStruct = rb_define_class("Struct", rb_cObject);
rb_include_module(rb_cStruct, rb_mEnumerable);
rb_undef_alloc_func(rb_cStruct);
rb_define_singleton_method(rb_cStruct, "new", rb_struct_s_def, -1);
rb_define_method(rb_cStruct, "initialize", rb_struct_initialize_m, -1);
rb_define_method(rb_cStruct, "initialize_copy", rb_struct_init_copy, 1);
rb_define_method(rb_cStruct, "==", rb_struct_equal, 1);
rb_define_method(rb_cStruct, "eql?", rb_struct_eql, 1);
rb_define_method(rb_cStruct, "hash", rb_struct_hash, 0);
rb_define_method(rb_cStruct, "inspect", rb_struct_inspect, 0);
rb_define_alias(rb_cStruct, "to_s", "inspect");
rb_define_method(rb_cStruct, "to_a", rb_struct_to_a, 0);
rb_define_method(rb_cStruct, "to_h", rb_struct_to_h, 0);
rb_define_method(rb_cStruct, "values", rb_struct_to_a, 0);
rb_define_method(rb_cStruct, "size", rb_struct_size, 0);
rb_define_method(rb_cStruct, "length", rb_struct_size, 0);
rb_define_method(rb_cStruct, "each", rb_struct_each, 0);
rb_define_method(rb_cStruct, "each_pair", rb_struct_each_pair, 0);
rb_define_method(rb_cStruct, "[]", rb_struct_aref, 1);
rb_define_method(rb_cStruct, "[]=", rb_struct_aset, 2);
rb_define_method(rb_cStruct, "select", rb_struct_select, -1);
rb_define_method(rb_cStruct, "filter", rb_struct_select, -1);
rb_define_method(rb_cStruct, "values_at", rb_struct_values_at, -1);
rb_define_method(rb_cStruct, "members", rb_struct_members_m, 0);
rb_define_method(rb_cStruct, "dig", rb_struct_dig, -1);
rb_define_method(rb_cStruct, "deconstruct", rb_struct_to_a, 0);
rb_define_method(rb_cStruct, "deconstruct_keys", rb_struct_deconstruct_keys, 1);
}
#undef rb_intern
void
Init_Struct(void)
{
id_members = rb_intern("__members__");
id_back_members = rb_intern("__members_back__");
id_keyword_init = rb_intern("__keyword_init__");
InitVM(Struct);
}
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