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ruby--ruby/hash.c
matz 3db12e8b23 Initial revision
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@2 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
1998-01-16 12:13:05 +00:00

1005 lines
18 KiB
C

/************************************************
hash.c -
$Author$
$Date$
created at: Mon Nov 22 18:51:18 JST 1993
Copyright (C) 1993-1997 Yukihiro Matsumoto
************************************************/
#include "ruby.h"
#include "st.h"
#include "sig.h"
#ifdef HAVE_STRING_H
# include <string.h>
#else
char *strchr();
#endif
#define HASH_DELETED 0x1
#define HASH_REHASHED 0x2
#ifndef NT
char *getenv();
#endif
VALUE cHash;
static VALUE envtbl;
static ID hash;
VALUE
rb_hash(obj)
VALUE obj;
{
return rb_funcall(obj, hash, 0);
}
static int
any_cmp(a, b)
VALUE a, b;
{
if (FIXNUM_P(a)) {
if (FIXNUM_P(b)) return a != b;
}
else if (TYPE(a) == T_STRING) {
if (TYPE(b) == T_STRING) return str_cmp(a, b);
}
DEFER_INTS;
a = !rb_eql(a, b);
ENABLE_INTS;
return a;
}
static int
any_hash(a, mod)
VALUE a;
int mod;
{
unsigned int hval;
switch (TYPE(a)) {
case T_FIXNUM:
hval = a;
break;
case T_STRING:
hval = str_hash(a);
break;
default:
DEFER_INTS;
hval = rb_funcall(a, hash, 0);
if (!FIXNUM_P(hval)) {
hval = rb_funcall(hval, '%', 1, INT2FIX(65439));
}
ENABLE_INTS;
hval = FIX2INT(hval);
}
return hval % mod;
}
static struct st_hash_type objhash = {
any_cmp,
any_hash,
};
struct hash_foreach_arg {
struct RHash *hash;
enum st_retval (*func)();
char *arg;
};
static int
hash_foreach_iter(key, value, arg)
VALUE key, value;
struct hash_foreach_arg *arg;
{
int status;
if (key == Qnil) return ST_CONTINUE;
status = (*arg->func)(key, value, arg->arg);
if (arg->hash->status & HASH_REHASHED) return ST_STOP;
return status;
}
static VALUE
hash_foreach_call(arg)
struct hash_foreach_arg *arg;
{
st_foreach(arg->hash->tbl, hash_foreach_iter, arg);
return Qnil;
}
static int
hash_delete_nil(key, value)
VALUE key, value;
{
if (key == Qnil) return ST_DELETE;
return ST_CONTINUE;
}
static void
hash_foreach_ensure(hash)
struct RHash *hash;
{
hash->iter_lev--;
if (hash->iter_lev == 0) {
if (hash->status & HASH_DELETED) {
st_foreach(hash->tbl, hash_delete_nil, 0);
}
hash->status = 0;
}
}
static int
hash_foreach(hash, func, farg)
struct RHash *hash;
enum st_retval (*func)();
char *farg;
{
struct hash_foreach_arg arg;
hash->iter_lev++;
arg.hash = hash;
arg.func = func;
arg.arg = farg;
return rb_ensure(hash_foreach_call, &arg, hash_foreach_ensure, hash);
}
static VALUE
hash_s_new(argc, argv, class)
int argc;
VALUE *argv;
VALUE class;
{
VALUE sz;
int size;
NEWOBJ(hash, struct RHash);
OBJSETUP(hash, class, T_HASH);
rb_scan_args(argc, argv, "01", &sz);
if (NIL_P(sz)) size = 0;
else size = NUM2INT(sz);
hash->iter_lev = 0;
hash->status = 0;
hash->tbl = 0; /* avoid GC crashing */
hash->tbl = st_init_table_with_size(&objhash, size);
return (VALUE)hash;
}
VALUE
hash_new2(class)
VALUE class;
{
return hash_s_new(0, 0, class);
}
VALUE
hash_new()
{
return hash_new2(cHash);
}
static VALUE
hash_s_create(argc, argv, class)
int argc;
VALUE *argv;
VALUE class;
{
struct RHash *hash;
int i;
if (argc == 1 && TYPE(argv[0]) == T_HASH) {
if (class == CLASS_OF(argv[0])) return argv[0];
else {
NEWOBJ(hash, struct RHash);
OBJSETUP(hash, class, T_HASH);
hash->iter_lev = 0;
hash->status = 0;
hash->tbl = 0; /* avoid GC crashing */
hash->tbl = (st_table*)st_copy(RHASH(argv[0])->tbl);
return (VALUE)hash;
}
}
if (argc % 2 != 0) {
ArgError("odd number args for Hash");
}
hash = (struct RHash*)hash_new2(class);
for (i=0; i<argc; i+=2) {
st_insert(hash->tbl, argv[i], argv[i+1]);
}
return (VALUE)hash;
}
static VALUE
hash_clone(hash)
struct RHash *hash;
{
NEWOBJ(hash2, struct RHash);
CLONESETUP(hash2, hash);
hash2->iter_lev = 0;
hash2->status = 0;
hash2->tbl = 0; /* avoid GC crashing */
hash2->tbl = (st_table*)st_copy(hash->tbl);
return (VALUE)hash2;
}
static int
hash_rehash_i(key, value, tbl)
VALUE key, value;
st_table *tbl;
{
if (key != Qnil) {
st_insert(tbl, key, value);
}
return ST_CONTINUE;
}
static VALUE
hash_rehash(hash)
struct RHash *hash;
{
st_table *tbl = st_init_table_with_size(&objhash, hash->tbl->num_entries);
st_foreach(hash->tbl, hash_rehash_i, tbl);
st_free_table(hash->tbl);
hash->tbl = tbl;
if (hash->iter_lev > 0) hash->status |= HASH_REHASHED;
return (VALUE)hash;
}
VALUE
hash_aref(hash, key)
struct RHash *hash;
VALUE key;
{
VALUE val;
if (!st_lookup(hash->tbl, key, &val)) {
return Qnil;
}
return val;
}
static VALUE
hash_indexes(argc, argv, hash)
int argc;
VALUE *argv;
struct RHash *hash;
{
struct RArray *indexes;
int i;
indexes = (struct RArray*)ary_new2(argc);
for (i=0; i<argc; i++) {
indexes->ptr[i] = hash_aref(hash, argv[i]);
}
indexes->len = i;
return (VALUE)indexes;
}
static VALUE
hash_delete(hash, key)
struct RHash *hash;
VALUE key;
{
VALUE val;
rb_secure(5);
if (hash->iter_lev > 0 && st_delete_safe(hash->tbl, &key, &val, Qnil))
return val;
else if (st_delete(hash->tbl, &key, &val))
return val;
if (iterator_p()) 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 == Qnil) return ST_CONTINUE;
if (var->stop) return ST_STOP;
var->stop = 1;
var->key = key;
var->val = value;
return ST_DELETE;
}
static VALUE
hash_shift(hash)
struct RHash *hash;
{
struct shift_var var;
rb_secure(5);
var.stop = 0;
st_foreach(hash->tbl, shift_i, &var);
if (var.stop == 0) return Qnil;
return assoc_new(var.key, var.val);
}
static int
delete_if_i(key, value)
VALUE key, value;
{
if (key == Qnil) return ST_CONTINUE;
if (rb_yield(assoc_new(key, value)))
return ST_DELETE;
return ST_CONTINUE;
}
static VALUE
hash_delete_if(hash)
struct RHash *hash;
{
rb_secure(5);
hash_foreach(hash, delete_if_i, 0);
return (VALUE)hash;
}
static int
clear_i(key, value)
VALUE key, value;
{
return ST_DELETE;
}
static VALUE
hash_clear(hash)
struct RHash *hash;
{
rb_secure(5);
st_foreach(hash->tbl, clear_i);
return (VALUE)hash;
}
VALUE
hash_aset(hash, key, val)
struct RHash *hash;
VALUE key, val;
{
rb_secure(5);
if (NIL_P(val)) {
hash_delete(hash, key);
return Qnil;
}
if (TYPE(key) == T_STRING) {
key = str_dup_freezed(key);
}
st_insert(hash->tbl, key, val);
return val;
}
static VALUE
hash_length(hash)
struct RHash *hash;
{
return INT2FIX(hash->tbl->num_entries);
}
VALUE
hash_empty_p(hash)
struct RHash *hash;
{
if (hash->tbl->num_entries == 0)
return TRUE;
return FALSE;
}
static int
each_value_i(key, value)
VALUE key, value;
{
if (key == Qnil) return ST_CONTINUE;
rb_yield(value);
return ST_CONTINUE;
}
static VALUE
hash_each_value(hash)
struct RHash *hash;
{
hash_foreach(hash, each_value_i);
return (VALUE)hash;
}
static int
each_key_i(key, value)
VALUE key, value;
{
if (key == Qnil) return ST_CONTINUE;
rb_yield(key);
return ST_CONTINUE;
}
static VALUE
hash_each_key(hash)
struct RHash *hash;
{
hash_foreach(hash, each_key_i);
return (VALUE)hash;
}
static int
each_pair_i(key, value)
VALUE key, value;
{
if (key == Qnil) return ST_CONTINUE;
rb_yield(assoc_new(key, value));
return ST_CONTINUE;
}
static VALUE
hash_each_pair(hash)
struct RHash *hash;
{
hash_foreach(hash, each_pair_i);
return (VALUE)hash;
}
static int
to_a_i(key, value, ary)
VALUE key, value, ary;
{
if (key == Qnil) return ST_CONTINUE;
ary_push(ary, assoc_new(key, value));
return ST_CONTINUE;
}
static VALUE
hash_to_a(hash)
struct RHash *hash;
{
VALUE ary;
ary = ary_new();
st_foreach(hash->tbl, to_a_i, ary);
return ary;
}
static int
inspect_i(key, value, str)
VALUE key, value;
struct RString *str;
{
VALUE str2;
if (key == Qnil) return ST_CONTINUE;
if (str->len > 1) {
str_cat(str, ", ", 2);
}
str2 = rb_inspect(key);
str_cat(str, RSTRING(str2)->ptr, RSTRING(str2)->len);
str_cat(str, "=>", 2);
str2 = rb_inspect(value);
str_cat(str, RSTRING(str2)->ptr, RSTRING(str2)->len);
return ST_CONTINUE;
}
static VALUE
hash_inspect(hash)
struct RHash *hash;
{
VALUE str;
str = str_new2("{");
st_foreach(hash->tbl, inspect_i, str);
str_cat(str, "}", 1);
return str;
}
static VALUE
hash_to_s(hash)
VALUE hash;
{
return ary_to_s(hash_to_a(hash));
}
static int
keys_i(key, value, ary)
VALUE key, value, ary;
{
if (key == Qnil) return ST_CONTINUE;
ary_push(ary, key);
return ST_CONTINUE;
}
static VALUE
hash_keys(hash)
struct RHash *hash;
{
VALUE ary;
ary = ary_new();
st_foreach(hash->tbl, keys_i, ary);
return ary;
}
static int
values_i(key, value, ary)
VALUE key, value, ary;
{
if (key == Qnil) return ST_CONTINUE;
ary_push(ary, value);
return ST_CONTINUE;
}
static VALUE
hash_values(hash)
struct RHash *hash;
{
VALUE ary;
ary = ary_new();
st_foreach(hash->tbl, values_i, ary);
return ary;
}
static VALUE
hash_has_key(hash, key)
struct RHash *hash;
VALUE key;
{
if (st_lookup(hash->tbl, key, 0)) {
return TRUE;
}
return FALSE;
}
static int
hash_search_value(key, value, data)
VALUE key, value, *data;
{
if (key == Qnil) return ST_CONTINUE;
if (rb_equal(value, data[1])) {
data[0] = TRUE;
return ST_STOP;
}
return ST_CONTINUE;
}
static VALUE
hash_has_value(hash, val)
struct RHash *hash;
VALUE val;
{
VALUE data[2];
data[0] = FALSE;
data[1] = val;
st_foreach(hash->tbl, 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 == Qnil) return ST_CONTINUE;
if (!st_lookup(data->tbl, key, &val2)) {
data->result = FALSE;
return ST_STOP;
}
if (!rb_equal(val1, val2)) {
data->result = FALSE;
return ST_STOP;
}
return ST_CONTINUE;
}
static VALUE
hash_equal(hash1, hash2)
struct RHash *hash1, *hash2;
{
struct equal_data data;
if (TYPE(hash2) != T_HASH) return FALSE;
if (hash1->tbl->num_entries != hash2->tbl->num_entries)
return FALSE;
data.tbl = hash2->tbl;
data.result = TRUE;
st_foreach(hash1->tbl, equal_i, &data);
return data.result;
}
static int
hash_invert_i(key, value, hash)
VALUE key, value;
struct RHash *hash;
{
if (key == Qnil) return ST_CONTINUE;
hash_aset(hash, value, key);
return ST_CONTINUE;
}
static VALUE
hash_invert(hash)
struct RHash *hash;
{
VALUE h = hash_new();
st_foreach(hash->tbl, hash_invert_i, h);
return h;
}
int env_path_tainted = 0;
#ifndef NT
extern char **environ;
#endif
static VALUE
env_delete(obj, name)
VALUE obj;
struct RString *name;
{
int i, len;
char *nam, *val = 0;
rb_secure(4);
Check_Type(name, T_STRING);
nam = name->ptr;
len = strlen(nam);
if (strcmp(nam, "PATH") == 0) env_path_tainted = 0;
for(i=0; environ[i]; i++) {
if (strncmp(environ[i], nam, len) == 0 && environ[i][len] == '=') {
val = environ[i]+len+1;
break;
}
}
while (environ[i]) {
environ[i] = environ[i+1];
i++;
}
if (val) {
return str_new2(val);
}
return Qnil;
}
static VALUE
f_getenv(obj, name)
VALUE obj;
struct RString *name;
{
char *env;
Check_Type(name, T_STRING);
if (strlen(name->ptr) != name->len)
ArgError("Bad environment name");
env = getenv(name->ptr);
if (env) {
if (strcmp(name->ptr, "PATH") == 0 && !env_path_tainted)
return str_new2(env);
return str_taint(str_new2(env));
}
return Qnil;
}
static VALUE
f_setenv(obj, name, value)
VALUE obj;
struct RString *name, *value;
{
if (rb_safe_level() >= 4) {
extern VALUE eSecurityError;
Raise(eSecurityError, "cannot change environment variable");
}
Check_SafeStr(name);
if (NIL_P(value)) {
env_delete(obj, name);
return Qnil;
}
Check_SafeStr(value);
if (strlen(name->ptr) != name->len)
ArgError("Bad environment name");
if (strlen(value->ptr) != value->len)
ArgError("Bad environment value");
setenv(name->ptr, value->ptr, 1);
if (strcmp(name->ptr, "PATH") == 0) env_path_tainted = 0;
return TRUE;
}
static VALUE
env_keys()
{
char **env;
VALUE ary = ary_new();
env = environ;
while (*env) {
char *s = strchr(*env, '=');
ary_push(ary, str_taint(str_new(*env, s-*env)));
env++;
}
return ary;
}
static VALUE
env_each_key(hash)
VALUE hash;
{
return ary_each(env_keys());
}
static VALUE
env_values()
{
char **env;
VALUE ary = ary_new();
env = environ;
while (*env) {
char *s = strchr(*env, '=');
ary_push(ary, str_taint(str_new2(s+1)));
env++;
}
return ary;
}
static VALUE
env_each_value(hash)
VALUE hash;
{
return ary_each(env_values());
}
static VALUE
env_each(hash)
VALUE hash;
{
VALUE ary = env_keys();
VALUE *ptr = RARRAY(ary)->ptr;
int len = RARRAY(ary)->len;
while (len--) {
VALUE val = f_getenv(Qnil, *ptr);
if (!NIL_P(val)) {
rb_yield(assoc_new(*ptr, val));
}
ptr++;
}
return hash;
}
static VALUE
env_delete_if()
{
VALUE ary = env_keys();
VALUE *ptr = RARRAY(ary)->ptr;
int len = RARRAY(ary)->len;
while (len--) {
VALUE val = f_getenv(Qnil, *ptr);
if (!NIL_P(val)) {
if (RTEST(rb_yield(assoc_new(*ptr, val)))) {
env_delete(Qnil, *ptr);
}
}
ptr++;
}
return envtbl;
}
static VALUE
env_to_s()
{
return str_new2("ENV");
}
static VALUE
env_to_a()
{
char **env;
VALUE ary = ary_new();
env = environ;
while (*env) {
char *s = strchr(*env, '=');
ary_push(ary, assoc_new(str_taint(str_new(*env, s-*env)),
str_taint(str_new2(s+1))));
env++;
}
return ary;
}
static VALUE
env_none()
{
return Qnil;
}
static VALUE
env_size()
{
int i;
for(i=0; environ[i]; i++)
;
return INT2FIX(i);
}
static VALUE
env_empty_p()
{
if (environ[0] == 0) return TRUE;
return FALSE;
}
static VALUE
env_has_key(env, key)
VALUE env, key;
{
if (TYPE(key) != T_STRING) return FALSE;
if (getenv(RSTRING(key)->ptr)) return TRUE;
return FALSE;
}
static VALUE
env_has_value(dmy, value)
VALUE dmy, value;
{
char **env;
VALUE ary;
if (TYPE(value) != T_STRING) return FALSE;
ary = ary_new();
env = environ;
while (*env) {
char *s = strchr(*env, '=')+1;
int len = strlen(s);
if (strncmp(s, RSTRING(value)->ptr, len) == 0) return TRUE;
env++;
}
return FALSE;
}
static VALUE
env_indexes(argc, argv)
int argc;
VALUE *argv;
{
int i;
VALUE indexes = ary_new2(argc);
for (i=0;i<argc;i++) {
char *v = 0;
if (TYPE(argv[i]) == T_STRING) {
v = getenv(RSTRING(argv[i])->ptr);
}
if (v) {
RARRAY(indexes)->ptr[i] = str_new2(v);
}
else {
RARRAY(indexes)->ptr[i] = Qnil;
}
RARRAY(indexes)->len = i+1;
}
return indexes;
}
void
Init_Hash()
{
extern VALUE mEnumerable;
hash = rb_intern("hash");
cHash = rb_define_class("Hash", cObject);
rb_include_module(cHash, mEnumerable);
rb_define_singleton_method(cHash, "new", hash_s_new, -1);
rb_define_singleton_method(cHash, "[]", hash_s_create, -1);
rb_define_method(cHash,"clone", hash_clone, 0);
rb_define_method(cHash,"rehash", hash_rehash, 0);
rb_define_method(cHash,"to_a", hash_to_a, 0);
rb_define_method(cHash,"to_s", hash_to_s, 0);
rb_define_method(cHash,"inspect", hash_inspect, 0);
rb_define_method(cHash,"==", hash_equal, 1);
rb_define_method(cHash,"[]", hash_aref, 1);
rb_define_method(cHash,"[]=", hash_aset, 2);
rb_define_method(cHash,"indexes", hash_indexes, -1);
rb_define_method(cHash,"length", hash_length, 0);
rb_define_alias(cHash, "size", "length");
rb_define_method(cHash,"empty?", hash_empty_p, 0);
rb_define_method(cHash,"each", hash_each_pair, 0);
rb_define_method(cHash,"each_value", hash_each_value, 0);
rb_define_method(cHash,"each_key", hash_each_key, 0);
rb_define_method(cHash,"each_pair", hash_each_pair, 0);
rb_define_method(cHash,"keys", hash_keys, 0);
rb_define_method(cHash,"values", hash_values, 0);
rb_define_method(cHash,"shift", hash_shift, 0);
rb_define_method(cHash,"delete", hash_delete, 1);
rb_define_method(cHash,"delete_if", hash_delete_if, 0);
rb_define_method(cHash,"clear", hash_clear, 0);
rb_define_method(cHash,"invert", hash_invert, 0);
rb_define_method(cHash,"include?", hash_has_key, 1);
rb_define_method(cHash,"has_key?", hash_has_key, 1);
rb_define_method(cHash,"has_value?", hash_has_value, 1);
rb_define_method(cHash,"key?", hash_has_key, 1);
rb_define_method(cHash,"value?", hash_has_value, 1);
envtbl = obj_alloc(cObject);
rb_extend_object(envtbl, mEnumerable);
rb_define_singleton_method(envtbl,"[]", f_getenv, 1);
rb_define_singleton_method(envtbl,"[]=", f_setenv, 2);
rb_define_singleton_method(envtbl,"each", env_each, 0);
rb_define_singleton_method(envtbl,"each_pair", env_each, 0);
rb_define_singleton_method(envtbl,"each_key", env_each_key, 0);
rb_define_singleton_method(envtbl,"each_value", env_each_value, 0);
rb_define_singleton_method(envtbl,"delete", env_delete, 1);
rb_define_singleton_method(envtbl,"delete_if", env_delete_if, 0);
rb_define_singleton_method(envtbl,"to_s", env_to_s, 0);
rb_define_singleton_method(envtbl,"rehash", env_none, 0);
rb_define_singleton_method(envtbl,"to_a", env_to_a, 0);
rb_define_singleton_method(envtbl,"indexes", env_indexes, -1);
rb_define_singleton_method(envtbl,"length", env_size, 0);
rb_define_singleton_method(envtbl,"empty?", env_empty_p, 0);
rb_define_singleton_method(envtbl,"keys", env_keys, 0);
rb_define_singleton_method(envtbl,"values", env_values, 0);
rb_define_singleton_method(envtbl,"include?", env_has_key, 1);
rb_define_singleton_method(envtbl,"has_key?", env_has_key, 1);
rb_define_singleton_method(envtbl,"has_value?", env_has_value, 1);
rb_define_singleton_method(envtbl,"key?", env_has_key, 1);
rb_define_singleton_method(envtbl,"value?", env_has_value, 1);
rb_define_global_const("ENV", envtbl);
}