I18n:Updating Unicode version

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This document describes the process of updating the files in the Mozilla codebase that are generated from Unicode data files.

Unicode properties

To regenerate the tables in nsUnicodePropertyData.cpp:

Download the current Unicode data files from http://www.unicode.org/Public/UNIDATA/
NB: not all the files are actually needed; currently, we require

• UnicodeData.txt
• Scripts.txt
• EastAsianWidth.txt
• BidiMirroring.txt
• HangulSyllableType.txt
• SpecialCasing.txt
• ReadMe.txt (to record version/date of the UCD)
• Unihan_Variants.txt (from Unihan.zip)

though this may change if we find a need for additional properties.

The Unicode data files listed above should be together in one directory.

We also require the file http://www.unicode.org/Public/security/latest/xidmodifications.txt
This file should be in a sub-directory "security" immediately below the directory containing the other Unicode data files.

We also require the latest data file for UTR50, currently revision-13: http://www.unicode.org/Public/vertical/revision-13/VerticalOrientation-13.txt
This file should be in a sub-directory "vertical" immediately below the directory containing the other Unicode data files.

From intl/unicharutil/util, run the command:

perl ../tools/genUnicodePropertyData.pl /path/to/hb-common.h /path/to/UCD-directory

(where hb-common.h is found in the gfx/harfbuzz/src directory).

This will generate (or overwrite!) the files

• nsUnicodePropertyData.cpp
• nsUnicodeScriptCodes.h

in the current directory.

Casing

We require Unicode data files from http://www.unicode.org/Public/UNIDATA/
As well as UnicodeData.txt downloaded in the previous step, we need

• SpecialCasing.txt

From intl/unichar/util, run the command:

perl ../tools/genSpecialCasingData.pl /path/to/UCD-directory/UnicodeData.txt /path/to/UCD-directory/SpecialCasing.txt > nsSpecialCasingData.cpp

This will generate (or overwrite!) the files

• nsSpecialCasingData.cpp
• all-lower-ref.html
• all-lower.html
• all-title-ref.html
• all-title.html
• all-upper-ref.html
• all-upper.html

in the current directory

Then move the six *.html files to layout/reftests/text-transform

Normalization

Currently our normalization data is frozen at Unicode 3.2 to conform to RFC 3454 (Stringprep), see Bug 728180

JavaScript Unicode support

To update SpiderMonkey's Unicode support:

• move into js/src/vm/
• run python ./make_unicode.py
• verify that UnicodeData.txt and the derived files were correctly updated

Note that running python ./make_unicode.py FILENAME instead uses FILENAME as a UnicodeData.txt, if you ever want to generate new data without overwriting the current js/src/vm/UnicodeData.txt.