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// © 2016 and later: Unicode, Inc. and others.
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// License & terms of use: http://www.unicode.org/copyright.html
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/*
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**********************************************************************
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* Copyright (C) 1999-2007, International Business Machines
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* Corporation and others. All Rights Reserved.
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**********************************************************************
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* Date Name Description
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* 11/17/99 aliu Creation.
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**********************************************************************
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*/
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#ifndef RBT_H
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#define RBT_H
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#include "unicode/utypes.h"
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#if !UCONFIG_NO_TRANSLITERATION
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#include "unicode/translit.h"
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#include "unicode/utypes.h"
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#include "unicode/parseerr.h"
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#include "unicode/udata.h"
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#define U_ICUDATA_TRANSLIT U_ICUDATA_NAME U_TREE_SEPARATOR_STRING "translit"
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U_NAMESPACE_BEGIN
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class TransliterationRuleData;
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/**
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* <code>RuleBasedTransliterator</code> is a transliterator
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* that reads a set of rules in order to determine how to perform
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* translations. Rule sets are stored in resource bundles indexed by
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* name. Rules within a rule set are separated by semicolons (';').
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* To include a literal semicolon, prefix it with a backslash ('\').
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* Whitespace, as defined by <code>Character.isWhitespace()</code>,
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* is ignored. If the first non-blank character on a line is '#',
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* the entire line is ignored as a comment. </p>
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*
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* <p>Each set of rules consists of two groups, one forward, and one
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* reverse. This is a convention that is not enforced; rules for one
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* direction may be omitted, with the result that translations in
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* that direction will not modify the source text. In addition,
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* bidirectional forward-reverse rules may be specified for
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* symmetrical transformations.</p>
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*
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* <p><b>Rule syntax</b> </p>
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*
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* <p>Rule statements take one of the following forms: </p>
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*
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* <dl>
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* <dt><code>$alefmadda=\u0622;</code></dt>
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* <dd><strong>Variable definition.</strong> The name on the
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* left is assigned the text on the right. In this example,
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* after this statement, instances of the left hand name,
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* "<code>$alefmadda</code>", will be replaced by
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* the Unicode character U+0622. Variable names must begin
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* with a letter and consist only of letters, digits, and
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* underscores. Case is significant. Duplicate names cause
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* an exception to be thrown, that is, variables cannot be
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* redefined. The right hand side may contain well-formed
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* text of any length, including no text at all ("<code>$empty=;</code>").
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* The right hand side may contain embedded <code>UnicodeSet</code>
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* patterns, for example, "<code>$softvowel=[eiyEIY]</code>".</dd>
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* <dd> </dd>
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* <dt><code>ai>$alefmadda;</code></dt>
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* <dd><strong>Forward translation rule.</strong> This rule
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* states that the string on the left will be changed to the
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* string on the right when performing forward
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* transliteration.</dd>
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* <dt> </dt>
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* <dt><code>ai<$alefmadda;</code></dt>
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* <dd><strong>Reverse translation rule.</strong> This rule
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* states that the string on the right will be changed to
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* the string on the left when performing reverse
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* transliteration.</dd>
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* </dl>
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*
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* <dl>
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* <dt><code>ai<>$alefmadda;</code></dt>
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* <dd><strong>Bidirectional translation rule.</strong> This
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* rule states that the string on the right will be changed
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* to the string on the left when performing forward
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* transliteration, and vice versa when performing reverse
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* transliteration.</dd>
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* </dl>
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*
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* <p>Translation rules consist of a <em>match pattern</em> and an <em>output
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* string</em>. The match pattern consists of literal characters,
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* optionally preceded by context, and optionally followed by
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* context. Context characters, like literal pattern characters,
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* must be matched in the text being transliterated. However, unlike
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* literal pattern characters, they are not replaced by the output
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* text. For example, the pattern "<code>abc{def}</code>"
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* indicates the characters "<code>def</code>" must be
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* preceded by "<code>abc</code>" for a successful match.
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* If there is a successful match, "<code>def</code>" will
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* be replaced, but not "<code>abc</code>". The final '<code>}</code>'
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* is optional, so "<code>abc{def</code>" is equivalent to
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* "<code>abc{def}</code>". Another example is "<code>{123}456</code>"
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* (or "<code>123}456</code>") in which the literal
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* pattern "<code>123</code>" must be followed by "<code>456</code>".
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* </p>
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*
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* <p>The output string of a forward or reverse rule consists of
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* characters to replace the literal pattern characters. If the
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* output string contains the character '<code>|</code>', this is
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* taken to indicate the location of the <em>cursor</em> after
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* replacement. The cursor is the point in the text at which the
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* next replacement, if any, will be applied. The cursor is usually
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* placed within the replacement text; however, it can actually be
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* placed into the precending or following context by using the
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* special character '<code>@</code>'. Examples:</p>
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*
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* <blockquote>
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* <p><code>a {foo} z > | @ bar; # foo -> bar, move cursor
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* before a<br>
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* {foo} xyz > bar @@|; # foo -> bar, cursor between
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* y and z</code></p>
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* </blockquote>
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*
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* <p><b>UnicodeSet</b></p>
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*
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* <p><code>UnicodeSet</code> patterns may appear anywhere that
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* makes sense. They may appear in variable definitions.
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* Contrariwise, <code>UnicodeSet</code> patterns may themselves
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* contain variable references, such as "<code>$a=[a-z];$not_a=[^$a]</code>",
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* or "<code>$range=a-z;$ll=[$range]</code>".</p>
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*
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* <p><code>UnicodeSet</code> patterns may also be embedded directly
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* into rule strings. Thus, the following two rules are equivalent:</p>
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*
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* <blockquote>
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* <p><code>$vowel=[aeiou]; $vowel>'*'; # One way to do this<br>
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* [aeiou]>'*';
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* #
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* Another way</code></p>
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* </blockquote>
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*
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* <p>See {@link UnicodeSet} for more documentation and examples.</p>
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*
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* <p><b>Segments</b></p>
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*
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* <p>Segments of the input string can be matched and copied to the
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* output string. This makes certain sets of rules simpler and more
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* general, and makes reordering possible. For example:</p>
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*
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* <blockquote>
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* <p><code>([a-z]) > $1 $1;
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* #
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* double lowercase letters<br>
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* ([:Lu:]) ([:Ll:]) > $2 $1; # reverse order of Lu-Ll pairs</code></p>
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* </blockquote>
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*
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* <p>The segment of the input string to be copied is delimited by
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* "<code>(</code>" and "<code>)</code>". Up to
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* nine segments may be defined. Segments may not overlap. In the
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* output string, "<code>$1</code>" through "<code>$9</code>"
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* represent the input string segments, in left-to-right order of
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* definition.</p>
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*
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* <p><b>Anchors</b></p>
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*
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* <p>Patterns can be anchored to the beginning or the end of the text. This is done with the
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* special characters '<code>^</code>' and '<code>$</code>'. For example:</p>
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*
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* <blockquote>
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* <p><code>^ a > 'BEG_A'; # match 'a' at start of text<br>
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* a > 'A'; # match other instances
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* of 'a'<br>
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* z $ > 'END_Z'; # match 'z' at end of text<br>
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* z > 'Z'; # match other instances
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* of 'z'</code></p>
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* </blockquote>
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*
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* <p>It is also possible to match the beginning or the end of the text using a <code>UnicodeSet</code>.
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* This is done by including a virtual anchor character '<code>$</code>' at the end of the
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* set pattern. Although this is usually the match chafacter for the end anchor, the set will
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* match either the beginning or the end of the text, depending on its placement. For
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* example:</p>
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*
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* <blockquote>
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* <p><code>$x = [a-z$]; # match 'a' through 'z' OR anchor<br>
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* $x 1 > 2; # match '1' after a-z or at the start<br>
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* 3 $x > 4; # match '3' before a-z or at the end</code></p>
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* </blockquote>
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*
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* <p><b>Example</b> </p>
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*
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* <p>The following example rules illustrate many of the features of
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* the rule language. </p>
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*
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* <table border="0" cellpadding="4">
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* <tr>
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* <td valign="top">Rule 1.</td>
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* <td valign="top" nowrap><code>abc{def}>x|y</code></td>
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* </tr>
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* <tr>
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* <td valign="top">Rule 2.</td>
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* <td valign="top" nowrap><code>xyz>r</code></td>
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* </tr>
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* <tr>
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* <td valign="top">Rule 3.</td>
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* <td valign="top" nowrap><code>yz>q</code></td>
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* </tr>
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* </table>
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*
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* <p>Applying these rules to the string "<code>adefabcdefz</code>"
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* yields the following results: </p>
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*
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* <table border="0" cellpadding="4">
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* <tr>
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* <td valign="top" nowrap><code>|adefabcdefz</code></td>
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* <td valign="top">Initial state, no rules match. Advance
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* cursor.</td>
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* </tr>
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* <tr>
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* <td valign="top" nowrap><code>a|defabcdefz</code></td>
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* <td valign="top">Still no match. Rule 1 does not match
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* because the preceding context is not present.</td>
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* </tr>
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* <tr>
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* <td valign="top" nowrap><code>ad|efabcdefz</code></td>
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* <td valign="top">Still no match. Keep advancing until
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* there is a match...</td>
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* </tr>
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* <tr>
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* <td valign="top" nowrap><code>ade|fabcdefz</code></td>
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* <td valign="top">...</td>
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* </tr>
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* <tr>
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* <td valign="top" nowrap><code>adef|abcdefz</code></td>
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* <td valign="top">...</td>
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* </tr>
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* <tr>
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* <td valign="top" nowrap><code>adefa|bcdefz</code></td>
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* <td valign="top">...</td>
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* </tr>
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* <tr>
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* <td valign="top" nowrap><code>adefab|cdefz</code></td>
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* <td valign="top">...</td>
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* </tr>
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* <tr>
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* <td valign="top" nowrap><code>adefabc|defz</code></td>
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* <td valign="top">Rule 1 matches; replace "<code>def</code>"
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* with "<code>xy</code>" and back up the cursor
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* to before the '<code>y</code>'.</td>
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* </tr>
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* <tr>
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* <td valign="top" nowrap><code>adefabcx|yz</code></td>
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* <td valign="top">Although "<code>xyz</code>" is
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* present, rule 2 does not match because the cursor is
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* before the '<code>y</code>', not before the '<code>x</code>'.
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* Rule 3 does match. Replace "<code>yz</code>"
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* with "<code>q</code>".</td>
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* </tr>
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* <tr>
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* <td valign="top" nowrap><code>adefabcxq|</code></td>
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* <td valign="top">The cursor is at the end;
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* transliteration is complete.</td>
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* </tr>
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* </table>
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*
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* <p>The order of rules is significant. If multiple rules may match
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* at some point, the first matching rule is applied. </p>
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*
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* <p>Forward and reverse rules may have an empty output string.
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* Otherwise, an empty left or right hand side of any statement is a
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* syntax error. </p>
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*
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* <p>Single quotes are used to quote any character other than a
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* digit or letter. To specify a single quote itself, inside or
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* outside of quotes, use two single quotes in a row. For example,
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* the rule "<code>'>'>o''clock</code>" changes the
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* string "<code>></code>" to the string "<code>o'clock</code>".
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* </p>
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*
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* <p><b>Notes</b> </p>
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*
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* <p>While a RuleBasedTransliterator is being built, it checks that
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* the rules are added in proper order. For example, if the rule
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* "a>x" is followed by the rule "ab>y",
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* then the second rule will throw an exception. The reason is that
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* the second rule can never be triggered, since the first rule
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* always matches anything it matches. In other words, the first
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* rule <em>masks</em> the second rule. </p>
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*
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* @author Alan Liu
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* @internal Use transliterator factory methods instead since this class will be removed in that release.
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*/
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class RuleBasedTransliterator : public Transliterator {
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private:
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/**
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* The data object is immutable, so we can freely share it with
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* other instances of RBT, as long as we do NOT own this object.
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* TODO: data is no longer immutable. See bugs #1866, 2155
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*/
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TransliterationRuleData* fData;
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/**
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* If true, we own the data object and must delete it.
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*/
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UBool isDataOwned;
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public:
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/**
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* Constructs a new transliterator from the given rules.
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* @param rules rules, separated by ';'
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* @param direction either FORWARD or REVERSE.
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* @exception IllegalArgumentException if rules are malformed.
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* @internal Use transliterator factory methods instead since this class will be removed in that release.
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*/
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RuleBasedTransliterator(const UnicodeString& id,
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const UnicodeString& rules,
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UTransDirection direction,
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UnicodeFilter* adoptedFilter,
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UParseError& parseError,
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UErrorCode& status);
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/**
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* Constructs a new transliterator from the given rules.
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* @param rules rules, separated by ';'
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* @param direction either FORWARD or REVERSE.
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* @exception IllegalArgumentException if rules are malformed.
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* @internal Use transliterator factory methods instead since this class will be removed in that release.
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*/
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/*RuleBasedTransliterator(const UnicodeString& id,
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const UnicodeString& rules,
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UTransDirection direction,
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UnicodeFilter* adoptedFilter,
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UErrorCode& status);*/
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/**
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* Covenience constructor with no filter.
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|
* @internal Use transliterator factory methods instead since this class will be removed in that release.
|
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|
*/
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|
/*RuleBasedTransliterator(const UnicodeString& id,
|
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|
const UnicodeString& rules,
|
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|
|
UTransDirection direction,
|
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|
|
UErrorCode& status);*/
|
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|
|
/**
|
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|
* Covenience constructor with no filter and FORWARD direction.
|
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|
* @internal Use transliterator factory methods instead since this class will be removed in that release.
|
|
|
|
*/
|
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|
|
/*RuleBasedTransliterator(const UnicodeString& id,
|
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|
|
const UnicodeString& rules,
|
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|
|
UErrorCode& status);*/
|
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|
|
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|
|
|
/**
|
|
|
|
* Covenience constructor with FORWARD direction.
|
|
|
|
* @internal Use transliterator factory methods instead since this class will be removed in that release.
|
|
|
|
*/
|
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|
|
/*RuleBasedTransliterator(const UnicodeString& id,
|
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|
|
const UnicodeString& rules,
|
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|
|
UnicodeFilter* adoptedFilter,
|
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|
|
UErrorCode& status);*/
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private:
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|
friend class TransliteratorRegistry; // to access TransliterationRuleData convenience ctor
|
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|
|
/**
|
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|
|
* Covenience constructor.
|
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|
|
* @param id the id for the transliterator.
|
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|
|
* @param theData the rule data for the transliterator.
|
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|
|
* @param adoptedFilter the filter for the transliterator
|
|
|
|
*/
|
|
|
|
RuleBasedTransliterator(const UnicodeString& id,
|
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|
|
const TransliterationRuleData* theData,
|
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|
|
UnicodeFilter* adoptedFilter = 0);
|
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|
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|
|
friend class Transliterator; // to access following ct
|
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|
|
/**
|
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|
|
* Internal constructor.
|
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|
|
* @param id the id for the transliterator.
|
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|
|
* @param theData the rule data for the transliterator.
|
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|
|
* @param isDataAdopted determine who will own the 'data' object. True, the caller should not delete 'data'.
|
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|
|
*/
|
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|
|
RuleBasedTransliterator(const UnicodeString& id,
|
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|
|
TransliterationRuleData* data,
|
|
|
|
UBool isDataAdopted);
|
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|
|
public:
|
|
|
|
|
|
|
|
/**
|
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|
|
* Copy constructor.
|
|
|
|
* @internal Use transliterator factory methods instead since this class will be removed in that release.
|
|
|
|
*/
|
|
|
|
RuleBasedTransliterator(const RuleBasedTransliterator&);
|
|
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|
|
virtual ~RuleBasedTransliterator();
|
|
|
|
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|
|
|
/**
|
|
|
|
* Implement Transliterator API.
|
|
|
|
* @internal Use transliterator factory methods instead since this class will be removed in that release.
|
|
|
|
*/
|
|
|
|
virtual Transliterator* clone(void) const;
|
|
|
|
|
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|
|
protected:
|
|
|
|
/**
|
|
|
|
* Implements {@link Transliterator#handleTransliterate}.
|
|
|
|
* @internal Use transliterator factory methods instead since this class will be removed in that release.
|
|
|
|
*/
|
|
|
|
virtual void handleTransliterate(Replaceable& text, UTransPosition& offsets,
|
|
|
|
UBool isIncremental) const;
|
|
|
|
|
|
|
|
public:
|
|
|
|
/**
|
|
|
|
* Return a representation of this transliterator as source rules.
|
|
|
|
* These rules will produce an equivalent transliterator if used
|
|
|
|
* to construct a new transliterator.
|
|
|
|
* @param result the string to receive the rules. Previous
|
|
|
|
* contents will be deleted.
|
|
|
|
* @param escapeUnprintable if TRUE then convert unprintable
|
|
|
|
* character to their hex escape representations, \uxxxx or
|
|
|
|
* \Uxxxxxxxx. Unprintable characters are those other than
|
|
|
|
* U+000A, U+0020..U+007E.
|
|
|
|
* @internal Use transliterator factory methods instead since this class will be removed in that release.
|
|
|
|
*/
|
|
|
|
virtual UnicodeString& toRules(UnicodeString& result,
|
|
|
|
UBool escapeUnprintable) const;
|
|
|
|
|
|
|
|
protected:
|
|
|
|
/**
|
|
|
|
* Implement Transliterator framework
|
|
|
|
*/
|
|
|
|
virtual void handleGetSourceSet(UnicodeSet& result) const;
|
|
|
|
|
|
|
|
public:
|
|
|
|
/**
|
|
|
|
* Override Transliterator framework
|
|
|
|
*/
|
|
|
|
virtual UnicodeSet& getTargetSet(UnicodeSet& result) const;
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Return the class ID for this class. This is useful only for
|
|
|
|
* comparing to a return value from getDynamicClassID(). For example:
|
|
|
|
* <pre>
|
|
|
|
* . Base* polymorphic_pointer = createPolymorphicObject();
|
|
|
|
* . if (polymorphic_pointer->getDynamicClassID() ==
|
|
|
|
* . Derived::getStaticClassID()) ...
|
|
|
|
* </pre>
|
|
|
|
* @return The class ID for all objects of this class.
|
|
|
|
* @internal Use transliterator factory methods instead since this class will be removed in that release.
|
|
|
|
*/
|
|
|
|
U_I18N_API static UClassID U_EXPORT2 getStaticClassID(void);
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Returns a unique class ID <b>polymorphically</b>. This method
|
|
|
|
* is to implement a simple version of RTTI, since not all C++
|
|
|
|
* compilers support genuine RTTI. Polymorphic operator==() and
|
|
|
|
* clone() methods call this method.
|
|
|
|
*
|
|
|
|
* @return The class ID for this object. All objects of a given
|
|
|
|
* class have the same class ID. Objects of other classes have
|
|
|
|
* different class IDs.
|
|
|
|
*/
|
|
|
|
virtual UClassID getDynamicClassID(void) const;
|
|
|
|
|
|
|
|
private:
|
|
|
|
|
|
|
|
void _construct(const UnicodeString& rules,
|
|
|
|
UTransDirection direction,
|
|
|
|
UParseError& parseError,
|
|
|
|
UErrorCode& status);
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
|
|
U_NAMESPACE_END
|
|
|
|
|
|
|
|
#endif /* #if !UCONFIG_NO_TRANSLITERATION */
|
|
|
|
|
|
|
|
#endif
|