rename ENC_CODERANGE_SINGLE to ENC_CODERANGE_7BIT.
rename ENC_CODERANGE_MULTI to ENC_CODERANGE_8BIT.
Because single byte 8bit character, such as Shift_JIS 1byte katakana,
is represented by ENC_CODERANGE_MULTI even if it is not multi byte.
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(rb_enc_str_asciicompat_p): defined.
* re.c (rb_reg_initialize_str): use rb_enc_str_asciionly_p.
(rb_reg_quote): return ascii-8bit string if the argument is
ascii-only to generate encoding generic regexp if possible.
(rb_reg_s_union): fix encoding handling. [ruby-dev:32094]
* string.c (rb_enc_str_asciionly_p): defined.
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* re.c (Init_Regexp): new method Regexp#encoding.
* string.c (str_encoding): moved to encoding.c
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cache bits.
* include/ruby/encoding.h (ENC_CODERANGE_SET): fixed a bug not to
set chache bits.
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* encoding.c (rb_enc_find_index): search the encoding which has the
given name and return its index if found, or -1.
* st.c (type_strcasehash): case-insensitive string hash type.
* string.c (rb_str_force_encoding): force encoding of self. this name
comes from [ruby-dev:31894] by Martin Duerst. [ruby-dev:31744]
* include/ruby/encoding.h (rb_enc_find_index, rb_enc_associate_index):
prototyped.
* include/ruby/encoding.h (rb_enc_isctype): direct interface to ctype.
* include/ruby/st.h (st_init_strcasetable): prototyped.
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