69 lines
3.1 KiB
Java
69 lines
3.1 KiB
Java
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/*
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The contents of this file are subject to the THDL Open Community License
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Version 1.0 (the "License"); you may not use this file except in compliance
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with the License. You may obtain a copy of the License on the THDL web site
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(http://www.thdl.org/).
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Software distributed under the License is distributed on an "AS IS" basis,
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WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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License for the specific terms governing rights and limitations under the
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License.
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The Initial Developer of this software is the Tibetan and Himalayan Digital
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Library (THDL). Portions created by the THDL are Copyright 2001 THDL.
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All Rights Reserved.
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Contributor(s): ______________________________________.
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*/
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package org.thdl.tib.text.tshegbar;
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/** A TshegBar (pronounced <i>tsek bar</i>) is roughly a Tibetan
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* syllable. In truth, it is the stuff between two <i>tsek</i>s.
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*
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* <p> First, some terminology.</p>
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*
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* <ul> <li>When we talk about a <i>glyph</i>, we mean a picture
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* found in a font. A single glyph may have one or more
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* representations by sequences of Unicode characters, or it may not
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* be representable becuase it is only part of one Unicode character
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* or pictures a nonstandard character.</li> <li>When we talk about a
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* <i>stack</i>, we mean either a number (or half-number), a mark or
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* sign, a bit of punctuation, or a consonant stack.</li> <li>A
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* <i>consonant stack</i> is or one or more consonants stacked
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* vertically, plus an optional vocalic modification such as an
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* anusvara (DLC what do we call a bindu?) or visarga, plus zero or
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* more signs like <code>\u0F35</code>, plus an optional a-chung
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* (<code>\u0F71</code>), plus an optional simple vowel.</li> <li>By
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* <i>simple vowel</i>, we mean any of <code>\u0F72</code>,
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* <code>\u0F74</code>, <code>\u0F7A</code>, <code>\u0F7B</code>,
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* <code>\u0F7C</code>, <code>\u0F7D</code>, or
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* <code>\u0F80</code>.</li> </ul>
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*
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* (Note: The string <code>"\u0F68\u0F7E\u0F7C"</code> seems to equal
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* <code>"\u0F00"</code>, though the Unicode standard does not
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* indicate that it is so. This code treats it that way.)</p>
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*
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* <p> This class allows for invalid tsheg bars, like those
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* containing more than one prefix, more than two suffixes, an
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* invalid postsuffix (secondary suffix), more than one consonant
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* stack (excluding the special case of what we call in Extended
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* Wylie "'i", which is technically a consonant stack but is used in
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* Tibetan like a suffix).</p>.
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*
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* <p>Subclasses exist for valid, grammatically correct tsheg bars,
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* and for invalid tsheg bars. Note that correctness is at the tsheg
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* bar level only; it may be grammatically incorrect to concatenate
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* two valid tsheg bars. Some subclasses can be represented in
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* Unicode, but others contain nonstandard glyphs and cannot be.</p>
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*
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* @author David Chandler
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*/
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public abstract class TshegBar implements UnicodeReadyThunk {
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/** Returns true, as we consider a transliteration in the Tibetan
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* alphabet of a non-Tibetan language, say Chinese, as being
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* Tibetan.
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* @return true */
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public boolean isTibetan() { return true; }
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}
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