kc3-lang/gnulib/lib/unicase/context.h

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  Date : 2017-01-01T02:59:23
  

  version-etc: new year
  
  * build-aux/gendocs.sh (version):
  * doc/gendocs_template:
  * doc/gendocs_template_min:
  * doc/gnulib.texi:
  * lib/version-etc.c (COPYRIGHT_YEAR):
  Update copyright dates by hand in templates and the like.
  * all files: Run 'make update-copyright'.
  

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• lib/unicase/context.h

• /* Case-mapping contexts of UTF-8/UTF-16/UTF-32 substring.
     Copyright (C) 2009-2017 Free Software Foundation, Inc.
     Written by Bruno Haible <bruno@clisp.org>, 2009.
  
     This program is free software: you can redistribute it and/or modify it
     under the terms of the GNU Lesser General Public License as published
     by the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
  
     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     Lesser General Public License for more details.
  
     You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  
  
  /* The context of a prefix string combines the information of the "Before C"
     conditions of the Unicode Standard,
     <http://www.unicode.org/versions/Unicode5.0.0/ch03.pdf>, section 3.13,
     table 3-14 "Context Specification for Casing".
  
     casing_prefix_context_t contains the following fields:
  
       // Helper for evaluating the FINAL_SIGMA condition:
       //  Last character that was not case-ignorable.
       ucs4_t last_char_except_ignorable;
  
       // Helper for evaluating the AFTER_SOFT_DOTTED and AFTER_I conditions:
       // Last character that was of combining class 230 ("Above") or 0.
       ucs4_t last_char_normal_or_above;
  
     Three bits would be sufficient to carry the context information, but
     that would require to invoke uc_is_cased and uc_is_property_soft_dotted
     ahead of time, more often than actually needed.  */
  
  
  /* The context of a suffix string combines the information of the "After C"
     conditions of the Unicode Standard,
     <http://www.unicode.org/versions/Unicode5.0.0/ch03.pdf>, section 3.13,
     table 3-14 "Context Specification for Casing".
  
     casing_suffix_context_t contains the following fields:
  
       // For evaluating the FINAL_SIGMA condition:
       //  First character that was not case-ignorable.
       ucs4_t first_char_except_ignorable;
  
       // For evaluating the MORE_ABOVE condition:
       // Bit 0 is set if the suffix contains a character of combining class
       // 230 (Above) with no character of combining class 0 or 230 (Above)
       // before it.
       //
       // For evaluating the BEFORE_DOT condition:
       // Bit 1 is set if the suffix contains a COMBINING DOT ABOVE (U+0307)
       // with no character of combining class 0 or 230 (Above) before it.
       //
       uint32_t bits;
  
     Three bits would be sufficient to carry the context information, but
     that would require to invoke uc_is_cased ahead of time, more often than
     actually needed.  */
  #define SCC_MORE_ABOVE_MASK  1
  #define SCC_BEFORE_DOT_MASK  2
  

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