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hash.c
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hash.c
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/**********************************************************************
hash.c -
$Author$
$Date$
created at: Mon Nov 22 18:51:18 JST 1993
Copyright (C) 1993-2002 Yukihiro Matsumoto
Copyright (C) 2000 Network Applied Communication Laboratory, Inc.
Copyright (C) 2000 Information-technology Promotion Agency, Japan
**********************************************************************/
#include "ruby.h"
#include "st.h"
#include "util.h"
#include "rubysig.h"
#ifdef __APPLE__
#include <crt_externs.h>
#endif
#define HASH_DELETED FL_USER1
#define HASH_PROC_DEFAULT FL_USER2
static void
rb_hash_modify(hash)
VALUE hash;
{
if (!RHASH(hash)->tbl) rb_raise(rb_eTypeError, "uninitialized Hash");
if (OBJ_FROZEN(hash)) rb_error_frozen("hash");
if (!OBJ_TAINTED(hash) && rb_safe_level() >= 4)
rb_raise(rb_eSecurityError, "Insecure: can't modify hash");
}
VALUE
rb_hash_freeze(hash)
VALUE hash;
{
return rb_obj_freeze(hash);
}
VALUE rb_cHash;
static VALUE envtbl;
static ID id_hash, id_yield, id_default;
VALUE
rb_hash(obj)
VALUE obj;
{
return rb_funcall(obj, id_hash, 0);
}
static VALUE
eql(args)
VALUE *args;
{
return (VALUE)rb_eql(args[0], args[1]);
}
static int
rb_any_cmp(a, b)
VALUE a, b;
{
VALUE args[2];
if (FIXNUM_P(a) && FIXNUM_P(b)) {
return a != b;
}
if (TYPE(a) == T_STRING && RBASIC(a)->klass == rb_cString &&
TYPE(b) == T_STRING && RBASIC(b)->klass == rb_cString) {
return rb_str_cmp(a, b);
}
if (SYMBOL_P(a) && SYMBOL_P(b)) {
return a != b;
}
if (a == Qundef || b == Qundef) return -1;
args[0] = a;
args[1] = b;
return !rb_with_disable_interrupt(eql, (VALUE)args);
}
static int
rb_any_hash(a)
VALUE a;
{
VALUE hval;
switch (TYPE(a)) {
case T_FIXNUM:
case T_SYMBOL:
return (int)a;
break;
case T_STRING:
return rb_str_hash(a);
break;
default:
DEFER_INTS;
hval = rb_funcall(a, id_hash, 0);
if (FIXNUM_P(hval)) {
hval %= 536870923;
}
else {
hval = rb_funcall(hval, '%', 1, INT2FIX(536870923));
}
ENABLE_INTS;
return (int)FIX2LONG(hval);
}
}
static struct st_hash_type objhash = {
rb_any_cmp,
rb_any_hash,
};
struct rb_hash_foreach_arg {
VALUE hash;
enum st_retval (*func)();
char *arg;
};
static int
rb_hash_foreach_iter(key, value, arg)
VALUE key, value;
struct rb_hash_foreach_arg *arg;
{
int status;
st_table *tbl = RHASH(arg->hash)->tbl;
struct st_table_entry **bins = tbl->bins;
if (key == Qundef) return ST_CONTINUE;
status = (*arg->func)(key, value, arg->arg);
if (RHASH(arg->hash)->tbl != tbl || RHASH(arg->hash)->tbl->bins != bins){
rb_raise(rb_eIndexError, "rehash occurred during iteration");
}
return status;
}
static VALUE
rb_hash_foreach_call(arg)
struct rb_hash_foreach_arg *arg;
{
st_foreach(RHASH(arg->hash)->tbl, rb_hash_foreach_iter, arg);
return Qnil;
}
static VALUE
rb_hash_foreach_ensure(hash)
VALUE hash;
{
RHASH(hash)->iter_lev--;
if (RHASH(hash)->iter_lev == 0) {
if (FL_TEST(hash, HASH_DELETED)) {
st_cleanup_safe(RHASH(hash)->tbl, Qundef);
FL_UNSET(hash, HASH_DELETED);
}
}
return 0;
}
static int
rb_hash_foreach(hash, func, farg)
VALUE hash;
enum st_retval (*func)();
char *farg;
{
struct rb_hash_foreach_arg arg;
RHASH(hash)->iter_lev++;
arg.hash = hash;
arg.func = func;
arg.arg = farg;
return rb_ensure(rb_hash_foreach_call, (VALUE)&arg, rb_hash_foreach_ensure, hash);
}
static VALUE
rb_hash_s_alloc(klass)
VALUE klass;
{
NEWOBJ(hash, struct RHash);
OBJSETUP(hash, klass, T_HASH);
hash->ifnone = Qnil;
hash->tbl = st_init_table(&objhash);
return (VALUE)hash;
}
VALUE
rb_hash_new()
{
return rb_hash_s_alloc(rb_cHash);
}
static VALUE
rb_hash_initialize(argc, argv, hash)
int argc;
VALUE *argv;
VALUE hash;
{
VALUE ifnone;
rb_hash_modify(hash);
if (rb_block_given_p()) {
if (argc > 0) {
rb_raise(rb_eArgError, "wrong number of arguments");
}
RHASH(hash)->ifnone = rb_f_lambda();
FL_SET(hash, HASH_PROC_DEFAULT);
}
else {
rb_scan_args(argc, argv, "01", &ifnone);
RHASH(hash)->ifnone = ifnone;
}
return hash;
}
static VALUE
rb_hash_s_create(argc, argv, klass)
int argc;
VALUE *argv;
VALUE klass;
{
VALUE hash;
int i;
if (argc == 1 && TYPE(argv[0]) == T_HASH) {
hash = rb_obj_alloc(klass);
RHASH(hash)->ifnone = Qnil;
RHASH(hash)->tbl = st_copy(RHASH(argv[0])->tbl);
return hash;
}
if (argc % 2 != 0) {
rb_raise(rb_eArgError, "odd number args for Hash");
}
hash = rb_obj_alloc(klass);
for (i=0; i<argc; i+=2) {
rb_hash_aset(hash, argv[i], argv[i + 1]);
}
return hash;
}
static VALUE
to_hash(hash)
VALUE hash;
{
return rb_convert_type(hash, T_HASH, "Hash", "to_hash");
}
static int
rb_hash_rehash_i(key, value, tbl)
VALUE key, value;
st_table *tbl;
{
if (key != Qundef) st_insert(tbl, key, value);
return ST_CONTINUE;
}
static VALUE
rb_hash_rehash(hash)
VALUE hash;
{
st_table *tbl;
rb_hash_modify(hash);
tbl = st_init_table_with_size(&objhash, RHASH(hash)->tbl->num_entries);
st_foreach(RHASH(hash)->tbl, rb_hash_rehash_i, tbl);
st_free_table(RHASH(hash)->tbl);
RHASH(hash)->tbl = tbl;
return hash;
}
VALUE
rb_hash_aref(hash, key)
VALUE hash, key;
{
VALUE val;
if (!st_lookup(RHASH(hash)->tbl, key, &val)) {
return rb_funcall(hash, id_default, 1, key);
}
return val;
}
static VALUE
rb_hash_fetch(argc, argv, hash)
int argc;
VALUE *argv;
VALUE hash;
{
VALUE key, if_none;
VALUE val;
rb_scan_args(argc, argv, "11", &key, &if_none);
if (!st_lookup(RHASH(hash)->tbl, key, &val)) {
if (rb_block_given_p()) {
if (argc > 1) {
rb_raise(rb_eArgError, "wrong number of arguments");
}
return rb_yield(key);
}
if (argc == 1) {
rb_raise(rb_eIndexError, "key not found");
}
return if_none;
}
return val;
}
static VALUE
rb_hash_default(argc, argv, hash)
int argc;
VALUE *argv;
VALUE hash;
{
VALUE key;
rb_scan_args(argc, argv, "01", &key);
if (FL_TEST(hash, HASH_PROC_DEFAULT)) {
return rb_funcall(RHASH(hash)->ifnone, id_yield, 2, hash, key);
}
return RHASH(hash)->ifnone;
}
static VALUE
rb_hash_set_default(hash, ifnone)
VALUE hash, ifnone;
{
rb_hash_modify(hash);
RHASH(hash)->ifnone = ifnone;
FL_UNSET(hash, HASH_PROC_DEFAULT);
return ifnone;
}
static VALUE
rb_hash_default_proc(hash)
VALUE hash;
{
if (FL_TEST(hash, HASH_PROC_DEFAULT)) {
return RHASH(hash)->ifnone;
}
return Qnil;
}
static int
index_i(key, value, args)
VALUE key, value;
VALUE *args;
{
if (rb_equal(value, args[0])) {
args[1] = key;
return ST_STOP;
}
return ST_CONTINUE;
}
static VALUE
rb_hash_index(hash, value)
VALUE hash, value;
{
VALUE args[2];
args[0] = value;
args[1] = Qnil;
st_foreach(RHASH(hash)->tbl, index_i, args);
return args[1];
}
static VALUE
rb_hash_indexes(argc, argv, hash)
int argc;
VALUE *argv;
VALUE hash;
{
VALUE indexes;
int i;
rb_warn("Hash#%s is deprecated; use Hash#select",
rb_id2name(rb_frame_last_func()));
indexes = rb_ary_new2(argc);
for (i=0; i<argc; i++) {
RARRAY(indexes)->ptr[i] = rb_hash_aref(hash, argv[i]);
RARRAY(indexes)->len++;
}
return indexes;
}
VALUE
rb_hash_delete(hash, key)
VALUE hash, key;
{
VALUE val;
rb_hash_modify(hash);
if (RHASH(hash)->iter_lev > 0) {
if (st_delete_safe(RHASH(hash)->tbl, &key, &val, Qundef)) {
FL_SET(hash, HASH_DELETED);
return val;
}
}
else if (st_delete(RHASH(hash)->tbl, &key, &val))
return val;
if (rb_block_given_p()) {
return rb_yield(key);
}
return Qnil;
}
struct shift_var {
int stop;
VALUE key;
VALUE val;
};
static int
shift_i(key, value, var)
VALUE key, value;
struct shift_var *var;
{
if (key == Qundef) return ST_CONTINUE;
if (var->stop) return ST_STOP;
var->stop = 1;
var->key = key;
var->val = value;
return ST_DELETE;
}
static VALUE
rb_hash_shift(hash)
VALUE hash;
{
struct shift_var var;
rb_hash_modify(hash);
var.stop = 0;
st_foreach(RHASH(hash)->tbl, shift_i, &var);
if (var.stop) {
return rb_assoc_new(var.key, var.val);
}
else if (FL_TEST(hash, HASH_PROC_DEFAULT)) {
return rb_funcall(RHASH(hash)->ifnone, id_yield, 2, hash, Qnil);
}
else {
return RHASH(hash)->ifnone;
}
}
static int
delete_if_i(key, value)
VALUE key, value;
{
if (key == Qundef) return ST_CONTINUE;
if (RTEST(rb_yield(rb_assoc_new(key, value))))
return ST_DELETE;
return ST_CONTINUE;
}
VALUE
rb_hash_delete_if(hash)
VALUE hash;
{
rb_hash_modify(hash);
rb_hash_foreach(hash, delete_if_i, 0);
return hash;
}
VALUE
rb_hash_reject_bang(hash)
VALUE hash;
{
int n = RHASH(hash)->tbl->num_entries;
rb_hash_delete_if(hash);
if (n == RHASH(hash)->tbl->num_entries) return Qnil;
return hash;
}
static VALUE
rb_hash_reject(hash)
VALUE hash;
{
return rb_hash_delete_if(rb_obj_dup(hash));
}
static int
select_i(key, value, result)
VALUE key, value;
{
VALUE assoc;
if (key == Qundef) return ST_CONTINUE;
assoc = rb_assoc_new(key, value);
if (RTEST(rb_yield(assoc)))
rb_ary_push(result, assoc);
return ST_CONTINUE;
}
VALUE
rb_hash_select(argc, argv, hash)
int argc;
VALUE *argv;
VALUE hash;
{
VALUE result = rb_ary_new();
long i;
if (rb_block_given_p()) {
if (argc > 0) {
rb_raise(rb_eArgError, "wrong number arguments(%d for 0)", argc);
}
rb_hash_foreach(hash, select_i, result);
}
else {
for (i=0; i<argc; i++) {
rb_ary_push(result, rb_hash_aref(hash, argv[i]));
}
}
return result;
}
static int
clear_i(key, value, dummy)
VALUE key, value, dummy;
{
return ST_DELETE;
}
static VALUE
rb_hash_clear(hash)
VALUE hash;
{
rb_hash_modify(hash);
st_foreach(RHASH(hash)->tbl, clear_i, 0);
return hash;
}
VALUE
rb_hash_aset(hash, key, val)
VALUE hash, key, val;
{
rb_hash_modify(hash);
if (TYPE(key) != T_STRING || st_lookup(RHASH(hash)->tbl, key, 0)) {
st_insert(RHASH(hash)->tbl, key, val);
}
else {
st_add_direct(RHASH(hash)->tbl, rb_str_new4(key), val);
}
return val;
}
static int
replace_i(key, val, hash)
VALUE key, val, hash;
{
if (key != Qundef) {
rb_hash_aset(hash, key, val);
}
return ST_CONTINUE;
}
static VALUE
rb_hash_become(hash, hash2)
VALUE hash, hash2;
{
hash2 = to_hash(hash2);
if (hash == hash2) return hash;
rb_hash_clear(hash);
st_foreach(RHASH(hash2)->tbl, replace_i, hash);
RHASH(hash)->ifnone = RHASH(hash2)->ifnone;
if (FL_TEST(hash2, HASH_PROC_DEFAULT)) {
FL_SET(hash, HASH_PROC_DEFAULT);
}
else {
FL_UNSET(hash, HASH_PROC_DEFAULT);
}
return hash;
}
static VALUE
rb_hash_size(hash)
VALUE hash;
{
return INT2FIX(RHASH(hash)->tbl->num_entries);
}
static VALUE
rb_hash_empty_p(hash)
VALUE hash;
{
if (RHASH(hash)->tbl->num_entries == 0)
return Qtrue;
return Qfalse;
}
static int
each_value_i(key, value)
VALUE key, value;
{
if (key == Qundef) return ST_CONTINUE;
rb_yield(value);
return ST_CONTINUE;
}
static VALUE
rb_hash_each_value(hash)
VALUE hash;
{
rb_hash_foreach(hash, each_value_i, 0);
return hash;
}
static int
each_key_i(key, value)
VALUE key, value;
{
if (key == Qundef) return ST_CONTINUE;
rb_yield(key);
return ST_CONTINUE;
}
static VALUE
rb_hash_each_key(hash)
VALUE hash;
{
rb_hash_foreach(hash, each_key_i, 0);
return hash;
}
static int
each_pair_i(key, value)
VALUE key, value;
{
if (key == Qundef) return ST_CONTINUE;
rb_yield(rb_assoc_new(key, value));
return ST_CONTINUE;
}
static VALUE
rb_hash_each_pair(hash)
VALUE hash;
{
rb_hash_foreach(hash, each_pair_i, 0);
return hash;
}
static int
to_a_i(key, value, ary)
VALUE key, value, ary;
{
if (key == Qundef) return ST_CONTINUE;
rb_ary_push(ary, rb_assoc_new(key, value));
return ST_CONTINUE;
}
static VALUE
rb_hash_to_a(hash)
VALUE hash;
{
VALUE ary;
ary = rb_ary_new();
st_foreach(RHASH(hash)->tbl, to_a_i, ary);
if (OBJ_TAINTED(hash)) OBJ_TAINT(ary);
return ary;
}
static VALUE
rb_hash_sort(hash)
VALUE hash;
{
VALUE entries = rb_hash_to_a(hash);
rb_ary_sort_bang(entries);
return entries;
}
static int
inspect_i(key, value, str)
VALUE key, value, str;
{
VALUE str2;
if (key == Qundef) return ST_CONTINUE;
if (RSTRING(str)->len > 1) {
rb_str_cat2(str, ", ");
}
str2 = rb_inspect(key);
rb_str_buf_append(str, str2);
OBJ_INFECT(str, str2);
rb_str_buf_cat2(str, "=>");
str2 = rb_inspect(value);
rb_str_buf_append(str, str2);
OBJ_INFECT(str, str2);
return ST_CONTINUE;
}
static VALUE
inspect_hash(hash)
VALUE hash;
{
VALUE str;
str = rb_str_buf_new2("{");
st_foreach(RHASH(hash)->tbl, inspect_i, str);
rb_str_buf_cat2(str, "}");
OBJ_INFECT(str, hash);
return str;
}
static VALUE
rb_hash_inspect(hash)
VALUE hash;
{
if (RHASH(hash)->tbl == 0 || RHASH(hash)->tbl->num_entries == 0)
return rb_str_new2("{}");
if (rb_inspecting_p(hash)) return rb_str_new2("{...}");
return rb_protect_inspect(inspect_hash, hash, 0);
}
static VALUE
to_s_hash(hash)
VALUE hash;
{
return rb_ary_to_s(rb_hash_to_a(hash));
}
static VALUE
rb_hash_to_s(hash)
VALUE hash;
{
if (rb_inspecting_p(hash)) return rb_str_new2("{...}");
return rb_protect_inspect(to_s_hash, hash, 0);
}
static VALUE
rb_hash_to_hash(hash)
VALUE hash;
{
return hash;
}
static int
keys_i(key, value, ary)
VALUE key, value, ary;
{
if (key == Qundef) return ST_CONTINUE;
rb_ary_push(ary, key);
return ST_CONTINUE;
}
static VALUE
rb_hash_keys(hash)
VALUE hash;
{
VALUE ary;
ary = rb_ary_new();
st_foreach(RHASH(hash)->tbl, keys_i, ary);
return ary;
}
static int
values_i(key, value, ary)
VALUE key, value, ary;
{
if (key == Qundef) return ST_CONTINUE;
rb_ary_push(ary, value);
return ST_CONTINUE;
}
static VALUE
rb_hash_values(hash)
VALUE hash;
{
VALUE ary;
ary = rb_ary_new();
st_foreach(RHASH(hash)->tbl, values_i, ary);
return ary;
}
static VALUE
rb_hash_has_key(hash, key)
VALUE hash;
VALUE key;
{
if (st_lookup(RHASH(hash)->tbl, key, 0)) {
return Qtrue;
}
return Qfalse;
}
static int
rb_hash_search_value(key, value, data)
VALUE key, value, *data;
{
if (key == Qundef) return ST_CONTINUE;
if (rb_equal(value, data[1])) {
data[0] = Qtrue;
return ST_STOP;
}
return ST_CONTINUE;
}
static VALUE
rb_hash_has_value(hash, val)
VALUE hash;
VALUE val;
{
VALUE data[2];
data[0] = Qfalse;
data[1] = val;
st_foreach(RHASH(hash)->tbl, rb_hash_search_value, data);
return data[0];
}
struct equal_data {
int result;
st_table *tbl;
};
static int
equal_i(key, val1, data)
VALUE key, val1;
struct equal_data *data;
{
VALUE val2;
if (key == Qundef) return ST_CONTINUE;
if (!st_lookup(data->tbl, key, &val2)) {
data->result = Qfalse;
return ST_STOP;
}
if (!rb_equal(val1, val2)) {
data->result = Qfalse;
return ST_STOP;
}
return ST_CONTINUE;
}
static VALUE
rb_hash_equal(hash1, hash2)
VALUE hash1, hash2;
{
struct equal_data data;
if (hash1 == hash2) return Qtrue;
if (TYPE(hash2) != T_HASH) return Qfalse;
if (RHASH(hash1)->tbl->num_entries != RHASH(hash2)->tbl->num_entries)
return Qfalse;
if (!(rb_equal(RHASH(hash1)->ifnone, RHASH(hash2)->ifnone) &&
FL_TEST(hash1, HASH_PROC_DEFAULT) == FL_TEST(hash2, HASH_PROC_DEFAULT)))
return Qfalse;
data.tbl = RHASH(hash2)->tbl;
data.result = Qtrue;
st_foreach(RHASH(hash1)->tbl, equal_i, &data);
return data.result;
}
static int
rb_hash_invert_i(key, value, hash)
VALUE key, value;
VALUE hash;
{
if (key == Qundef) return ST_CONTINUE;
rb_hash_aset(hash, value, key);
return ST_CONTINUE;
}
static VALUE
rb_hash_invert(hash)
VALUE hash;
{
VALUE h = rb_hash_new();
st_foreach(RHASH(hash)->tbl, rb_hash_invert_i, h);
return h;
}
static int
rb_hash_update_i(key, value, hash)
VALUE key, value;
VALUE hash;
{
if (key == Qundef) return ST_CONTINUE;
rb_hash_aset(hash, key, value);
return ST_CONTINUE;
}
static int
rb_hash_update_block_i(key, value, hash)
VALUE key, value;
VALUE hash;
{
if (key == Qundef) return ST_CONTINUE;
if (rb_hash_has_key(hash, key)) {
value = rb_yield(rb_ary_new3(3, key, rb_hash_aref(hash, key), value));
}
rb_hash_aset(hash, key, value);
return ST_CONTINUE;
}
static VALUE
rb_hash_update(hash1, hash2)
VALUE hash1, hash2;
{
hash2 = to_hash(hash2);
if (rb_block_given_p()) {
st_foreach(RHASH(hash2)->tbl, rb_hash_update_block_i, hash1);
}
else {
st_foreach(RHASH(hash2)->tbl, rb_hash_update_i, hash1);
}
return hash1;
}
static int path_tainted = -1;
static char **origenviron;
#ifdef NT
#define GET_ENVIRON(e) (e = rb_w32_get_environ())
#define FREE_ENVIRON(e) rb_w32_free_environ(e)
static char **my_environ;
#undef environ
#define environ my_environ
#elif defined(__APPLE__)
#undef environ
#define environ (*_NSGetEnviron())
#define GET_ENVIRON(e) (e)
#define FREE_ENVIRON(e)
#else
extern char **environ;
#define GET_ENVIRON(e) (e)
#define FREE_ENVIRON(e)
#endif
static VALUE
env_delete(obj, name)
VALUE obj, name;
{
char *nam, *val;
rb_secure(4);
SafeStringValue(name);
nam = RSTRING(name)->ptr;
if (strlen(nam) != RSTRING(name)->len) {
rb_raise(rb_eArgError, "bad environment variable name");
}
val = getenv(nam);
if (val) {
VALUE value = rb_tainted_str_new2(val);
ruby_setenv(nam, 0);
#ifdef __BORLANDC__
if (strcmpi(nam, "PATH") == 0) {
#else
if (strcmp(nam, "PATH") == 0) {
#endif
path_tainted = 0;
}
return value;
}
return Qnil;
}
static VALUE
env_delete_m(obj, name)
VALUE obj, name;
{
VALUE val = env_delete(obj, name);
if (rb_block_given_p()) rb_yield(name);
return val;
}
static VALUE