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Libraries
mruby
Commits
ac9d04f4
Commit
ac9d04f4
authored
Feb 10, 2017
by
Tomasz Dabrowski
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String#ljust and String#rjust reimplemented with optimized Ruby
parent
24048cd9
Changes
2
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2 changed files
with
38 additions
and
92 deletions
+38
-92
mrbgems/mruby-string-ext/mrblib/string.rb
mrbgems/mruby-string-ext/mrblib/string.rb
+38
-0
mrbgems/mruby-string-ext/src/string.c
mrbgems/mruby-string-ext/src/string.c
+0
-92
No files found.
mrbgems/mruby-string-ext/mrblib/string.rb
View file @
ac9d04f4
...
...
@@ -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
View file @
ac9d04f4
...
...
@@ -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
());
...
...
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