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ruby/struct.c

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30 KiB
C
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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"
/* 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;
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_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);
VALUE const * p;
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");
}
p = RARRAY_CONST_PTR(back);
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 (p[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 (;;) {
if (p[j] == name)
return FIX2INT(p[j + 1]);
if (!RTEST(p[j])) {
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$s' is not a struct member", obj, ID2SYM(id));
UNREACHABLE;
}
static VALUE rb_struct_ref0(VALUE obj) {return RSTRUCT_GET(obj, 0);}
static VALUE rb_struct_ref1(VALUE obj) {return RSTRUCT_GET(obj, 1);}
static VALUE rb_struct_ref2(VALUE obj) {return RSTRUCT_GET(obj, 2);}
static VALUE rb_struct_ref3(VALUE obj) {return RSTRUCT_GET(obj, 3);}
static VALUE rb_struct_ref4(VALUE obj) {return RSTRUCT_GET(obj, 4);}
static VALUE rb_struct_ref5(VALUE obj) {return RSTRUCT_GET(obj, 5);}
static VALUE rb_struct_ref6(VALUE obj) {return RSTRUCT_GET(obj, 6);}
static VALUE rb_struct_ref7(VALUE obj) {return RSTRUCT_GET(obj, 7);}
static VALUE rb_struct_ref8(VALUE obj) {return RSTRUCT_GET(obj, 8);}
static VALUE rb_struct_ref9(VALUE obj) {return RSTRUCT_GET(obj, 9);}
#define N_REF_FUNC numberof(ref_func)
static VALUE (*const ref_func[])(VALUE) = {
rb_struct_ref0,
rb_struct_ref1,
rb_struct_ref2,
rb_struct_ref3,
rb_struct_ref4,
rb_struct_ref5,
rb_struct_ref6,
rb_struct_ref7,
rb_struct_ref8,
rb_struct_ref9,
};
static void
rb_struct_modify(VALUE s)
{
rb_check_frozen(s);
rb_check_trusted(s);
}
static VALUE
anonymous_struct(VALUE klass)
{
VALUE nstr;
nstr = rb_class_new(klass);
rb_make_metaclass(nstr, RBASIC(klass)->klass);
rb_class_inherited(klass, nstr);
return nstr;
}
static VALUE
new_struct(VALUE name, VALUE super)
{
/* old style: should we warn? */
ID id;
name = rb_str_to_str(name);
if (!rb_is_const_name(name)) {
rb_name_err_raise("identifier %1$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_thread_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_thread_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
setup_struct(VALUE nstr, VALUE members)
{
const VALUE *ptr_members;
long i, len;
members = struct_set_members(nstr, members);
rb_define_alloc_func(nstr, struct_alloc);
rb_define_singleton_method(nstr, "new", rb_class_new_instance, -1);
rb_define_singleton_method(nstr, "[]", rb_class_new_instance, -1);
rb_define_singleton_method(nstr, "members", rb_struct_s_members_m, 0);
ptr_members = RARRAY_CONST_PTR(members);
len = RARRAY_LEN(members);
for (i=0; i< len; i++) {
ID id = SYM2ID(ptr_members[i]);
VALUE off = LONG2NUM(i);
if (i < N_REF_FUNC) {
rb_define_method_id(nstr, id, ref_func[i], 0);
}
else {
define_aref_method(nstr, ptr_members[i], 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);
}
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);
}
/*
* call-seq:
* Struct.new([class_name] [, member_name]+>) -> StructClass
* Struct.new([class_name] [, member_name]+>) {|StructClass| block } -> StructClass
* StructClass.new(value, ...) -> obj
* StructClass[value, ...] -> obj
*
* 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">
*
* 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.
*
* # 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">
*/
static VALUE
rb_struct_s_def(int argc, VALUE *argv, VALUE klass)
{
VALUE name, rest;
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;
}
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 (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);
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);
}
/*
*/
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 (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_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 = ALLOC_N(VALUE, 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 -> an_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 -> an_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, ">");
OBJ_INFECT(str, s);
return str;
}
/*
* call-seq:
* struct.to_s -> string
* struct.inspect -> string
*
* Describe the contents of this struct in 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
*
* Returns a Hash containing the names and values for the struct's members.
*
* Customer = Struct.new(:name, :address, :zip)
* joe = Customer.new("Joe Smith", "123 Maple, Anytown NC", 12345)
* joe.to_h[:address] #=> "123 Maple, Anytown NC"
*/
static VALUE
rb_struct_to_h(VALUE s)
{
VALUE h = rb_hash_new();
VALUE members = rb_struct_members(s);
long i;
for (i=0; i<RSTRUCT_LEN(s); i++) {
rb_hash_aset(h, rb_ary_entry(members, i), 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] -> anObject
* struct[index] -> anObject
*
* 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, ...) -> an_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 {|i| block } -> array
* struct.select -> an_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 % 2).zero? } #=> [22, 44, 66]
*/
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)
{
const VALUE *ptr, *ptr2;
long i, len;
if (recur) return Qtrue; /* Subtle! */
ptr = RSTRUCT_CONST_PTR(s);
ptr2 = RSTRUCT_CONST_PTR(s2);
len = RSTRUCT_LEN(s);
for (i=0; i<len; i++) {
if (!rb_equal(ptr[i], ptr2[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 -> fixnum
*
* Returns a hash value based on this struct's contents (see Object#hash).
*
* See also Object#hash.
*/
static VALUE
rb_struct_hash(VALUE s)
{
long i, len;
st_index_t h;
VALUE n;
const VALUE *ptr;
h = rb_hash_start(rb_hash(rb_obj_class(s)));
ptr = RSTRUCT_CONST_PTR(s);
len = RSTRUCT_LEN(s);
for (i = 0; i < len; i++) {
n = rb_hash(ptr[i]);
h = rb_hash_uint(h, NUM2LONG(n));
}
h = rb_hash_end(h);
return INT2FIX(h);
}
static VALUE
recursive_eql(VALUE s, VALUE s2, int recur)
{
const VALUE *ptr, *ptr2;
long i, len;
if (recur) return Qtrue; /* Subtle! */
ptr = RSTRUCT_CONST_PTR(s);
ptr2 = RSTRUCT_CONST_PTR(s2);
len = RSTRUCT_LEN(s);
for (i=0; i<len; i++) {
if (!rb_eql(ptr[i], ptr2[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 -> fixnum
* struct.size -> fixnum
*
* 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));
}
const VALUE*
rb_struct_ptr(VALUE s)
{
return RSTRUCT_CONST_PTR(s);
}
/*
* call-seq:
* struct.dig(key, ...) -> object
*
* Extracts the nested value specified by the sequence of <i>idx</i>
* objects by calling +dig+ at each step, returning +nil+ if any
* intermediate step is +nil+.
*
* klass = Struct.new(:a)
* o = klass.new(klass.new({b: [1, 2, 3]}))
*
* o.dig(:a, :a, :b, 0) #=> 1
* o.dig(:b, 0) #=> nil
*/
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);
}
/*
* 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, "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);
}
#undef rb_intern
void
Init_Struct(void)
{
id_members = rb_intern("__members__");
id_back_members = rb_intern("__members_back__");
InitVM(Struct);
}
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