42 lines
2.1 KiB
Plaintext
42 lines
2.1 KiB
Plaintext
# Case Folding Properties
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#
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# This file is a supplement to the UnicodeData file.
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# It provides a case folding mapping generated from the Unicode Character Database.
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# If all characters are mapped according to the full mapping below, then
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# case differences (according to UnicodeData.txt and SpecialCasing.txt)
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# are eliminated.
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#
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# The data supports both implementations that require simple case foldings
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# (where string lengths don't change), and implementations that allow full case folding
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# (where string lengths may grow). Note that where they can be supported, the
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# full case foldings are superior: for example, they allow "MASSE" and "Maße" to match.
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#
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# NOTE: case folding does not preserve normalization formats!
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#
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# For information on case folding, see
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# UTR #21 Case Mappings, at http://www.unicode.org/unicode/reports/tr21/
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#
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# ================================================================================
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# Format
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# ================================================================================
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# The entries in this file are in the following machine-readable format:
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#
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# <code>; <status>; <mapping>; # <name>
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#
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# The status field is:
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# C: common case folding, common mappings shared by both simple and full mappings.
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# F: full case folding, mappings that cause strings to grow in length. Multiple characters are separated by spaces.
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# S: simple case folding, mappings to single characters where different from F.
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# I: special case for dotted uppercase I and dotless lowercase i
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# - If this mapping is included, the result is case-insensitive, but dotless and dotted I's are not distinguished.
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# - If this mapping is excluded, the result is not fully case-insensitive, but dotless and dotted I's are distinguished.
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#
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# Usage:
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# A. To do a simple case folding, use the mappings with status C + S + I.
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# B. To do a full case folding, use the mappings with status C + F + I.
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# The mappings with status I can be omitted depending on the desired case-folding
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# behavior. (The default option is to retain them.)
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#
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# =================================================================
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