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Copyright (C) 2016 and later: Unicode, Inc. and others. License & terms of use: http://www.unicode.org/copyright.html#License Copyright (c) 2002-2010, International Business Machines Corporation and others. All Rights Reserved. IMPORTANT: This sample was originally intended as an exercise for the ICU Workshop (September 2000). The code currently provided in the solution file is the answer to the exercises, each step can still be found in the 'answers' subdirectory. http://www.icu-project.org/docs/workshop_2000/agenda.html Day 2: September 12th 2000 Pre-requisite: 1. All the hardware and software requirements from Day 1. 2. Attended or fully understand Day 1 material. 3. Read through the ICU user's guide at http://www.icu-project.org/userguide/. #Transformation Support 10:45am - 12:00pm Alan Liu Topics: 1. What is the Unicode normalization? 2. What kind of case mapping support is available in ICU? 3. What is Transliteration and how do I use a Transliterator on a document? 4. How do I add my own Transliterator? INSTRUCTIONS ------------ This exercise was developed and tested on ICU release 1.6.0, Win32, Microsoft Visual C++ 6.0. It should work on other ICU releases and other platforms as well. MSVC: Open the file "translit.sln" in Microsoft Visual C++. Unix: - Build and install ICU with a prefix, for example '--prefix=/home/srl/ICU' - Set the variable ICU_PREFIX=/home/srl/ICU and use GNU make in this directory. - You may use 'make check' to invoke this sample. PROBLEMS -------- Problem 0: To start with, the program prints out a series of dates formatted in Greek. Set up the program, build it, and run it. Problem 1: Basic Transliterator (Easy) The Greek text shows up almost entirely as Unicode escapes. These are unreadable on a US machine. Use an existing system transliterator to transliterate the Greek text to Latin so it can be phonetically read on a US machine. If you don't know the names of the system transliterators, use Transliterator::getAvailableID() and Transliterator::countAvailableIDs(), or look directly in the index table icu/data/translit_index.txt. Problem 2: RuleBasedTransliterator (Medium) Some of the text is still unreadable and shows up as Unicode escape sequences. Create a RuleBasedTransliterator to change the unreadable characters to close ASCII equivalents. For example, the rule "\u00C0 > A;" will change an 'A' with a grave accent to a plain 'A'. To save typing, use UnicodeSets to handle ranges of characters. See the included file "U0080.pdf" for a table of the U+00C0 to U+00FF Unicode block. Problem 3: Transliterator subclassing; Normalizer (Difficult) The rule-based approach is flexible and, in most cases, the best choice for creating a new transliterator. Sometimes, however, a more elegant algorithmic solution is available. Instead of typing in a list of rules, you can write C++ code to accomplish the desired transliteration. Use a Normalizer to remove accents from characters. You will need to convert each character to a sequence of base and combining characters by applying a canonical denormalization transformation. Then discard the combining characters (the accents etc.) leaving the base character. Wrap this all up in a subclass of the Transliterator class that overrides the pure virtual handleTransliterate() method. ANSWERS ------- The exercise includes answers. These are in the "answers" directory, and are numbered 1, 2, etc. In some cases new files that the user needs to create are included in the answers directory. If you get stuck and you want to move to the next step, copy the answers file into the main directory in order to proceed. E.g., "main_1.cpp" contains the original "main.cpp" file. "main_2.cpp" contains the "main.cpp" file after problem 1. Etc. Have fun!