1Copyright (C) 2016 and later: Unicode, Inc. and others. 2License & terms of use: http://www.unicode.org/copyright.html 3 4Copyright (c) 2002-2010, International Business Machines Corporation and others. All Rights Reserved. 5 6 7IMPORTANT: 8 9This sample was originally intended as an exercise for the ICU Workshop (September 2000). 10The code currently provided in the solution file is the answer to the exercises, each step can still be found in the 'answers' subdirectory. 11 12 13 14 http://www.icu-project.org/docs/workshop_2000/agenda.html 15 16 Day 2: September 12th 2000 17 Pre-requisite: 18 1. All the hardware and software requirements from Day 1. 19 2. Attended or fully understand Day 1 material. 20 3. Read through the ICU user's guide at https://unicode-org.github.io/icu/userguide/. 21 22 #Transformation Support 23 10:45am - 12:00pm 24 Alan Liu 25 26 Topics: 27 1. What is the Unicode normalization? 28 2. What kind of case mapping support is available in ICU? 29 3. What is Transliteration and how do I use a Transliterator on a document? 30 4. How do I add my own Transliterator? 31 32 33INSTRUCTIONS 34------------ 35 36This exercise was developed and tested on ICU release 1.6.0, Win32, 37Microsoft Visual C++ 6.0. It should work on other ICU releases and 38other platforms as well. 39 40 MSVC: 41 Open the file "translit.sln" in Microsoft Visual C++. 42 43 Unix: 44 - Build and install ICU with a prefix, for example '--prefix=/home/srl/ICU' 45 - Set the variable ICU_PREFIX=/home/srl/ICU and use GNU make in 46 this directory. 47 - You may use 'make check' to invoke this sample. 48 49 50PROBLEMS 51-------- 52 53Problem 0: 54 55 To start with, the program prints out a series of dates formatted in 56 Greek. Set up the program, build it, and run it. 57 58Problem 1: Basic Transliterator (Easy) 59 60 The Greek text shows up almost entirely as Unicode escapes. These 61 are unreadable on a US machine. Use an existing system 62 transliterator to transliterate the Greek text to Latin so it can be 63 phonetically read on a US machine. If you don't know the names of 64 the system transliterators, use Transliterator::getAvailableID() and 65 Transliterator::countAvailableIDs(), or look directly in the index 66 table icu/data/translit_index.txt. 67 68Problem 2: RuleBasedTransliterator (Medium) 69 70 Some of the text is still unreadable and shows up as Unicode escape 71 sequences. Create a RuleBasedTransliterator to change the 72 unreadable characters to close ASCII equivalents. For example, the 73 rule "\u00C0 > A;" will change an 'A' with a grave accent to a plain 74 'A'. 75 76 To save typing, use UnicodeSets to handle ranges of characters. 77 78 See the included file "U0080.pdf" for a table of the U+00C0 to U+00FF 79 Unicode block. 80 81Problem 3: Transliterator subclassing; Normalizer (Difficult) 82 83 The rule-based approach is flexible and, in most cases, the best 84 choice for creating a new transliterator. Sometimes, however, a 85 more elegant algorithmic solution is available. Instead of typing 86 in a list of rules, you can write C++ code to accomplish the desired 87 transliteration. 88 89 Use a Normalizer to remove accents from characters. You will need 90 to convert each character to a sequence of base and combining 91 characters by applying a canonical denormalization transformation. 92 Then discard the combining characters (the accents etc.) leaving the 93 base character. Wrap this all up in a subclass of the 94 Transliterator class that overrides the pure virtual 95 handleTransliterate() method. 96 97 98ANSWERS 99------- 100 101The exercise includes answers. These are in the "answers" directory, 102and are numbered 1, 2, etc. In some cases new files that the user 103needs to create are included in the answers directory. 104 105If you get stuck and you want to move to the next step, copy the 106answers file into the main directory in order to proceed. E.g., 107"main_1.cpp" contains the original "main.cpp" file. "main_2.cpp" 108contains the "main.cpp" file after problem 1. Etc. 109 110 111Have fun! 112