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Merge pull request #3449 from dabroz/fix-ljust-ruby

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String#ljust and String#rjust reimplemented with optimized Ruby
This commit is contained in:
Yukihiro "Matz" Matsumoto
2017-02-11 10:26:09 +09:00
committed by GitHub
parent c802cd07ba d1bc7caeca
commit b36495bcb5
4 changed files with 71 additions and 93 deletions
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mrbgems/mruby-string-ext/mrblib/string.rb
+38
View File
@@ -263,6 +263,44 @@ class String
self
end
##
# call-seq:
# str.ljust(integer, padstr=' ') -> new_str
#
# If <i>integer</i> is greater than the length of <i>str</i>, returns a new
# <code>String</code> of length <i>integer</i> with <i>str</i> left justified
# and padded with <i>padstr</i>; otherwise, returns <i>str</i>.
#
# "hello".ljust(4) #=> "hello"
# "hello".ljust(20) #=> "hello "
# "hello".ljust(20, '1234') #=> "hello123412341234123"
def ljust(idx, padstr = ' ')
raise ArgumentError, 'zero width padding' if padstr == ''
return self if idx <= self.size
pad_repetitions = (idx / padstr.length).ceil
padding = (padstr * pad_repetitions)[0...(idx - self.length)]
self + padding
end
##
# call-seq:
# str.rjust(integer, padstr=' ') -> new_str
#
# If <i>integer</i> is greater than the length of <i>str</i>, returns a new
# <code>String</code> of length <i>integer</i> with <i>str</i> right justified
# and padded with <i>padstr</i>; otherwise, returns <i>str</i>.
#
# "hello".rjust(4) #=> "hello"
# "hello".rjust(20) #=> " hello"
# "hello".rjust(20, '1234') #=> "123412341234123hello"
def rjust(idx, padstr = ' ')
raise ArgumentError, 'zero width padding' if padstr == ''
return self if idx <= self.size
pad_repetitions = (idx / padstr.length).ceil
padding = (padstr * pad_repetitions)[0...(idx - self.length)]
padding + self
end
# str.upto(other_str, exclusive=false) {|s| block } -> str
# str.upto(other_str, exclusive=false) -> an_enumerator
#
mrbgems/mruby-string-ext/src/string.c
-92
View File
@@ -5,9 +5,6 @@
#include <mruby/string.h>
#include <mruby/range.h>
#define MAX(a,b) ((a)>(b) ? (a) : (b))
#define MIN(a,b) ((a)<(b) ? (a) : (b))
static mrb_value
mrb_str_getbyte(mrb_state *mrb, mrb_value str)
{
@@ -512,93 +509,6 @@ mrb_str_ord(mrb_state* mrb, mrb_value str)
}
#endif
static mrb_value
mrb_str_just(mrb_state* mrb, mrb_value str, mrb_bool right_just)
{
mrb_value new_str;
mrb_int idx = 0, i = 0, bytes_to_copy = 0, start_pos = 0, final_pos = 0,
pad_str_length = 0;
mrb_int str_length = RSTRING_LEN(str);
const char *pad_str = NULL;
char *new_str_ptr = NULL;
mrb_get_args(mrb, "i|s!", &idx, &pad_str, &pad_str_length);
if (pad_str == NULL)
{
pad_str = " ";
pad_str_length = 1;
}
if (pad_str_length == 0)
{
mrb_raise(mrb, E_ARGUMENT_ERROR, "zero width padding");
}
if (idx <= str_length)
{
return str;
}
new_str = mrb_str_dup(mrb, str);
mrb_str_resize(mrb, new_str, idx);
new_str_ptr = RSTRING_PTR(new_str);
if (right_just)
{
memcpy(new_str_ptr + idx - str_length, RSTRING_PTR(str), str_length);
}
start_pos = right_just ? 0 : str_length;
final_pos = idx - (right_just ? str_length : 0);
for (i = start_pos; i < final_pos; i += pad_str_length)
{
bytes_to_copy = idx - i - (right_just ? str_length : 0);
bytes_to_copy = MIN(pad_str_length, bytes_to_copy);
memcpy(new_str_ptr + i, pad_str, bytes_to_copy);
}
return new_str;
}
/*
* call-seq:
* str.ljust(integer, padstr=' ') -> new_str
*
* If <i>integer</i> is greater than the length of <i>str</i>, returns a new
* <code>String</code> of length <i>integer</i> with <i>str</i> left justified
* and padded with <i>padstr</i>; otherwise, returns <i>str</i>.
*
* "hello".ljust(4) #=> "hello"
* "hello".ljust(20) #=> "hello "
* "hello".ljust(20, '1234') #=> "hello123412341234123"
*/
static mrb_value
mrb_str_ljust(mrb_state* mrb, mrb_value str)
{
return mrb_str_just(mrb, str, FALSE);
}
/*
* call-seq:
* str.rjust(integer, padstr=' ') -> new_str
*
* If <i>integer</i> is greater than the length of <i>str</i>, returns a new
* <code>String</code> of length <i>integer</i> with <i>str</i> right justified
* and padded with <i>padstr</i>; otherwise, returns <i>str</i>.
*
* "hello".rjust(4) #=> "hello"
* "hello".rjust(20) #=> " hello"
* "hello".rjust(20, '1234') #=> "123412341234123hello"
*/
static mrb_value
mrb_str_rjust(mrb_state* mrb, mrb_value str)
{
return mrb_str_just(mrb, str, TRUE);
}
void
mrb_mruby_string_ext_gem_init(mrb_state* mrb)
{
@@ -620,8 +530,6 @@ mrb_mruby_string_ext_gem_init(mrb_state* mrb)
mrb_define_method(mrb, s, "lines", mrb_str_lines, MRB_ARGS_NONE());
mrb_define_method(mrb, s, "succ", mrb_str_succ, MRB_ARGS_NONE());
mrb_define_method(mrb, s, "succ!", mrb_str_succ_bang, MRB_ARGS_NONE());
mrb_define_method(mrb, s, "ljust", mrb_str_ljust, MRB_ARGS_REQ(1)|MRB_ARGS_OPT(1));
mrb_define_method(mrb, s, "rjust", mrb_str_rjust, MRB_ARGS_REQ(1)|MRB_ARGS_OPT(1));
mrb_alias_method(mrb, s, mrb_intern_lit(mrb, "next"), mrb_intern_lit(mrb, "succ"));
mrb_alias_method(mrb, s, mrb_intern_lit(mrb, "next!"), mrb_intern_lit(mrb, "succ!"));
mrb_define_method(mrb, s, "ord", mrb_str_ord, MRB_ARGS_NONE());
mrbgems/mruby-string-ext/test/string.rb
+30
View File
@@ -433,6 +433,7 @@ end
assert('String#ljust') do
assert_equal "hello", "hello".ljust(4)
assert_equal "hello ", "hello".ljust(20)
assert_equal 20, "hello".ljust(20).length
assert_equal "hello123412341234123", "hello".ljust(20, '1234')
assert_equal "hello", "hello".ljust(-3)
end
@@ -440,10 +441,39 @@ end
assert('String#rjust') do
assert_equal "hello", "hello".rjust(4)
assert_equal " hello", "hello".rjust(20)
assert_equal 20, "hello".rjust(20).length
assert_equal "123412341234123hello", "hello".rjust(20, '1234')
assert_equal "hello", "hello".rjust(-3)
end
if UTF8STRING
assert('String#ljust with UTF8') do
assert_equal "helloん ", "helloん".ljust(20)
assert_equal "helloó ", "helloó".ljust(34)
assert_equal 34, "helloó".ljust(34).length
assert_equal "helloんんんんんんんんんんんんんん", "hello".ljust(19, 'ん')
assert_equal "helloんんんんんんんんんんんんんんん", "hello".ljust(20, 'ん')
end
assert('String#rjust with UTF8') do
assert_equal " helloん", "helloん".rjust(20)
assert_equal " helloó", "helloó".rjust(34)
# assert_equal 34, "helloó".rjust(34).length
assert_equal "んんんんんんんんんんんんんんhello", "hello".rjust(19, 'ん')
assert_equal "んんんんんんんんんんんんんんんhello", "hello".rjust(20, 'ん')
end
assert('UTF8 byte counting') do
skip('string length is broken after []=')
# based on assert_equal 34, "helloó".rjust(34).length
ret = ' '
ret[-6..-1] = "helloó"
assert_equal 34, ret.length
end
end
assert('String#ljust should not change string') do
a = "hello"
a.ljust(20)
src/string.c
+3 -1
View File
@@ -870,7 +870,9 @@ mrb_str_times(mrb_state *mrb, mrb_value self)
str2 = str_new(mrb, 0, len);
str_with_class(mrb, str2, self);
p = RSTR_PTR(str2);
if (len > 0) {
if (len == 1) {
memset(p, RSTRING_PTR(self)[0], len);
} else if (len > 0) {
n = RSTRING_LEN(self);
memcpy(p, RSTRING_PTR(self), n);
while (n <= len/2) {