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55 lines
2.2 KiB
55 lines
2.2 KiB
Transliteration Table README
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----------------------------
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1. Rationale: Identifiers within the database or programming languages
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only accept latin-1 characters, numbers and '_' character.
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Application developers can enter captions (titles) to give
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objects or variables a meaningful name using full unicode set.
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Transliteration is used to convert unicode captions to identifiers
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without loosing meaning of the names.
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More info:
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http://en.wikipedia.org/wiki/Transliteration
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http://en.wikipedia.org/wiki/Romanization
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2. We use special kind of romanization as we only allow characters
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described in 1.
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3. Implementation: transliteration table, was generated by
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generate_transliteration_table.sh shell script is used
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to transliterate any unicode character (having code < 65535)
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to an identifier, what gives constant time for converting
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single character.
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The resulting generated code is kept in transliteration_table.{h|cpp} files,
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included by identifier.cpp for use in public utility functions.
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For each item, the table (basically a table of c-strings) contains:
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- a NULL string it the resulting conversion have to be "_" string;
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- a c-string of size 1 or more containing a valid transliteration
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as described in 1;
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- an empty string "" if the transliteration should return empty string
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(can be useful e.g. for soft signs in Cyrillic)
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4. Fixes: Because iconv/recode tools are not fully implemented in regards
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to transliteration to latin-1 (e.g. no good support
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for Greek and Cyrillic/Serbian characters),
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the transliteration_table.cpp file is patched with
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transliteration_table.cpp.patch which provides fixes written by hand.
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If you find invalid or missing transliterations:
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a) edit transliteration_table.cpp (using UTF-8-compliant text editor!)
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- if transliteration_table.cpp file does not exist,
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extract it from transliteration_table.bz2 archive
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b) run update_transliteration_table_patch.sh shell script,
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what will update the transliteration_table.cpp.patch file
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c) send the transliteration_table.cpp.patch file to the Kexi team
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5. Credits
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Jaroslaw Staniek <js at iidea.pl>
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Michael Drueing <michael at drueing.de>
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Chusslove Illich <caslav.ilic at gmx.net>
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Michal Svec <rebel at atrey.karlin.mff.cuni.cz>
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