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101 lines
3.5 KiB
Text
101 lines
3.5 KiB
Text
Copyright (c) 2002-2007, International Business Machines Corporation and others. All Rights Reserved.
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This is an exercise for the ICU Workshop (September 2000).
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http://www.icu-project.org/docs/workshop_2000/agenda.html
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Day 2: September 12th 2000
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Pre-requisite:
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1. All the hardware and software requirements from Day 1.
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2. Attended or fully understand Day 1 material.
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3. Read through the ICU user's guide at
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http://www.icu-project.org/userguide/.
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#Transformation Support
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10:45am - 12:00pm
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Alan Liu
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Topics:
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1. What is the Unicode normalization?
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2. What kind of case mapping support is available in ICU?
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3. What is Transliteration and how do I use a Transliterator on a document?
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4. How do I add my own Transliterator?
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INSTRUCTIONS
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------------
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This exercise was developed and tested on ICU release 1.6.0, Win32,
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Microsoft Visual C++ 6.0. It should work on other ICU releases and
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other platforms as well.
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MSVC:
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Open the file "translit.sln" in Microsoft Visual C++.
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Unix:
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- Build and install ICU with a prefix, for example '--prefix=/home/srl/ICU'
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- Set the variable ICU_PREFIX=/home/srl/ICU and use GNU make in
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this directory.
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- You may use 'make check' to invoke this sample.
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PROBLEMS
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--------
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Problem 0:
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To start with, the program prints out a series of dates formatted in
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Greek. Set up the program, build it, and run it.
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Problem 1: Basic Transliterator (Easy)
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The Greek text shows up almost entirely as Unicode escapes. These
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are unreadable on a US machine. Use an existing system
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transliterator to transliterate the Greek text to Latin so it can be
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phonetically read on a US machine. If you don't know the names of
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the system transliterators, use Transliterator::getAvailableID() and
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Transliterator::countAvailableIDs(), or look directly in the index
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table icu/data/translit_index.txt.
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Problem 2: RuleBasedTransliterator (Medium)
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Some of the text is still unreadable and shows up as Unicode escape
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sequences. Create a RuleBasedTransliterator to change the
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unreadable characters to close ASCII equivalents. For example, the
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rule "\u00C0 > A;" will change an 'A' with a grave accent to a plain
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'A'.
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To save typing, use UnicodeSets to handle ranges of characters.
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See the included file "U0080.pdf" for a table of the U+00C0 to U+00FF
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Unicode block.
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Problem 3: Transliterator subclassing; Normalizer (Difficult)
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The rule-based approach is flexible and, in most cases, the best
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choice for creating a new transliterator. Sometimes, however, a
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more elegant algorithmic solution is available. Instead of typing
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in a list of rules, you can write C++ code to accomplish the desired
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transliteration.
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Use a Normalizer to remove accents from characters. You will need
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to convert each character to a sequence of base and combining
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characters by applying a canonical denormalization transformation.
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Then discard the combining characters (the accents etc.) leaving the
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base character. Wrap this all up in a subclass of the
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Transliterator class that overrides the pure virtual
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handleTransliterate() method.
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ANSWERS
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-------
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The exercise includes answers. These are in the "answers" directory,
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and are numbered 1, 2, etc. In some cases new files that the user
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needs to create are included in the answers directory.
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If you get stuck and you want to move to the next step, copy the
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answers file into the main directory in order to proceed. E.g.,
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"main_1.cpp" contains the original "main.cpp" file. "main_2.cpp"
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contains the "main.cpp" file after problem 1. Etc.
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Have fun!
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