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* string.c (rb_str_prepend): new method by Sora Harakami

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[Feature #3765]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@29120 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
shyouhei 2010-08-27 07:33:19 +00:00
parent 0cfe185f39
commit cff3c3d52a
3 changed files with 42 additions and 0 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
Fri Aug 27 16:20:01 2010 URABE Shyouhei <shyouhei@ruby-lang.org>
* string.c (rb_str_prepend): new method by Sora Harakami
[Feature #3765]
Fri Aug 27 15:24:20 2010 NAKAMURA Usaku <usa@ruby-lang.org>
* math.c (math_atan2): you should know that M_PI is not the feature

21
string.c
View file

@ -2056,6 +2056,26 @@ rb_str_concat(VALUE str1, VALUE str2)
}
}
/*
* call-seq:
* str.prepend(other_str) -> str
*
* Prepend---Prepend the given string to <i>str</i>.
*
* a = "world"
* a.prepend("hello ") #=> "hello world"
* a #=> "hello world"
*/
static VALUE
rb_str_prepend(VALUE str, VALUE str2)
{
StringValue(str2);
StringValue(str);
rb_str_update(str, 0L, 0L, str2);
return str;
}
st_index_t
rb_memhash(const void *ptr, long len)
{
@ -7525,6 +7545,7 @@ Init_String(void)
rb_define_method(rb_cString, "reverse!", rb_str_reverse_bang, 0);
rb_define_method(rb_cString, "concat", rb_str_concat, 1);
rb_define_method(rb_cString, "<<", rb_str_concat, 1);
rb_define_method(rb_cString, "prepend", rb_str_prepend, 1);
rb_define_method(rb_cString, "crypt", rb_str_crypt, 1);
rb_define_method(rb_cString, "intern", rb_str_intern, 0);
rb_define_method(rb_cString, "to_sym", rb_str_intern, 0);

16
test/ruby/test_string.rb
View file

@ -1882,4 +1882,20 @@ class TestString < Test::Unit::TestCase
assert_equal('"\\u3042\\u3044\\u3046"', "\u3042\u3044\u3046".encode(e).inspect)
end
end
def test_prepend
assert_equal(S("hello world!"), "world!".prepend("hello "))
foo = Object.new
def foo.to_str
"b"
end
assert_equal(S("ba"), "a".prepend(foo))
a = S("world")
b = S("hello ")
a.prepend(b)
assert_equal(S("hello world"), a)
assert_equal(S("hello "), b)
end
end