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* parse.y: encoding aware parsing.
* parse.y (pragma_encoding): encoding specification pragma.
* parse.y (rb_intern3): encoding specified symbols.
* string.c (rb_str_length): length based on characters.
for older behavior, bytesize method added.
* string.c (rb_str_index_m): index based on characters. rindex as
well.
* string.c (succ_char): encoding aware succeeding string.
* string.c (rb_str_reverse): reverse based on characters.
* string.c (rb_str_inspect): encoding aware string description.
* string.c (rb_str_upcase_bang): encoding aware case conversion.
downcase, capitalize, swapcase as well.
* string.c (rb_str_tr_bang): tr based on characters. delete,
squeeze, tr_s, count as well.
* string.c (rb_str_split_m): split based on characters.
* string.c (rb_str_each_line): encoding aware each_line.
* string.c (rb_str_each_char): added. iteration based on
characters.
* string.c (rb_str_strip_bang): encoding aware whitespace
stripping. lstrip, rstrip as well.
* string.c (rb_str_justify): encoding aware justifying (ljust,
rjust, center).
* string.c (str_encoding): get encoding attribute from a string.
* re.c (rb_reg_initialize): encoding aware regular expression
* sprintf.c (rb_str_format): formatting (i.e. length count) based
on characters.
* io.c (rb_io_getc): getc to return one-character string.
for older behavior, getbyte method added.
* ext/stringio/stringio.c (strio_getc): ditto.
* io.c (rb_io_ungetc): allow pushing arbitrary string at the
current reading point.
* ext/stringio/stringio.c (strio_ungetc): ditto.
* ext/strscan/strscan.c: encoding support.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@13261 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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