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add String#freeze to the core

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This commit is contained in:
Yukihiro "Matz" Matsumoto
2015-08-27 17:54:30 +09:00
parent 87e11676b3
commit 1a45447b8b
2 changed files with 29 additions and 3 deletions
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src/string.c
+21
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@@ -75,9 +75,18 @@ str_decref(mrb_state *mrb, mrb_shared_string *shared)
}
}
static void
check_frozen(mrb_state *mrb, struct RString *s)
{
if (RSTR_FROZEN_P(s)) {
mrb_raise(mrb, E_RUNTIME_ERROR, "can't modify frozen string");
}
}
MRB_API void
mrb_str_modify(mrb_state *mrb, struct RString *s)
{
check_frozen(mrb, s);
if (RSTR_SHARED_P(s)) {
mrb_shared_string *shared = s->as.heap.aux.shared;
@@ -119,6 +128,15 @@ mrb_str_modify(mrb_state *mrb, struct RString *s)
}
}
static mrb_value
mrb_str_freeze(mrb_state *mrb, mrb_value str)
{
struct RString *s = mrb_str_ptr(str);
RSTR_SET_FROZEN_FLAG(s);
return str;
}
MRB_API mrb_value
mrb_str_resize(mrb_state *mrb, mrb_value str, mrb_int len)
{
@@ -1345,6 +1363,7 @@ str_replace(mrb_state *mrb, struct RString *s1, struct RString *s2)
{
long len;
check_frozen(mrb, s1);
len = RSTR_LEN(s2);
if (RSTR_SHARED_P(s1)) {
str_decref(mrb, s1->as.heap.aux.shared);
@@ -2514,4 +2533,6 @@ mrb_init_string(mrb_state *mrb)
mrb_define_method(mrb, s, "upcase!", mrb_str_upcase_bang, MRB_ARGS_NONE()); /* 15.2.10.5.43 */
mrb_define_method(mrb, s, "inspect", mrb_str_inspect, MRB_ARGS_NONE()); /* 15.2.10.5.46(x) */
mrb_define_method(mrb, s, "bytes", mrb_str_bytes, MRB_ARGS_NONE());
mrb_define_method(mrb, s, "freeze", mrb_str_freeze, MRB_ARGS_NONE());
}