In order to update the Unicode data files, follow these steps:

1. Download the following files into your current working directory (e.g. graal/regex). If updating to another version, replace 12.1.0 with the version you are aiming for.
   • UnicodeData.txt (https://www.unicode.org/Public/12.1.0/ucd/UnicodeData.txt)
   • CaseFolding.txt (https://www.unicode.org/Public/12.1.0/ucd/CaseFolding.txt)
   • SpecialCasing.txt (https://www.unicode.org/Public/12.1.0/ucd/SpecialCasing.txt)
   • PropertyAliases.txt (https://www.unicode.org/Public/12.1.0/ucd/PropertyAliases.txt)
   • PropertyValueAliases.txt (https://www.unicode.org/Public/12.1.0/ucd/PropertyValueAliases.txt)
   • ucd.nounihan.flat.xml (https://www.unicode.org/Public/12.1.0/ucdxml/ucd.nounihan.flat.zip)
     • You will need to unzip the archive.
   • emoji-data.txt (https://unicode.org/Public/emoji/12.0/emoji-data.txt)
2. Run src/com.oracle.truffle.regex/tools/unicode-script.sh. This generates the following files in your current working directory:
   • UnicodeFoldTable.txt
   • NonUnicodeFoldTable.txt
   • PythonSimpleCasing.txt
   • PythonExtendedCasing.txt
3. Run src/com.oracle.truffle.regex/tools/generate_case_fold_table.clj >> src/com.oracle.truffle.regex/src/com/oracle/truffle/regex/tregex/parser/CaseFoldTable.java to generate the new case fold tables and append them to CaseFoldTable.java. Then open CaseFoldTable.java in an editor to replace the old character data with the new definitions.

• In order to run this script, you will need to have a way to run Clojure scripts.
  • You can use Boot (https://boot-clj.com/), which lets you execute the script directly. Boot can usually be installed from your distribution's package manager.
  • Alternatively, you can use a Clojure jar file directly as in java -jar clojure-1.8.0.jar --init src/com.oracle.truffle.regex/tools/generate_case_fold_table.clj --eval '(-main)'.

4. Run src/com.oracle.truffle.regex/tools/generate_unicode_properties.py > src/com.oracle.truffle.regex/src/com/oracle/truffle/regex/charset/UnicodePropertyData.java. This rewrites UnicodePropertyData.java to contain the new definitions of Unicode properties.
5. Run the main method of com.oracle.truffle.regex.charset.UnicodeGeneralCategoriesGenerator and replace src/com.oracle.truffle.regex/src/com/oracle/truffle/regex/charset/UnicodeGeneralCategories.java with its output.
6. Run mx eclipseformat to fix any code formatting issues.

Steps 1-4 are automated by run_scripts.sh. This script assumes you have the following things installed: clojure, python3, wget, and unzip.