838 lines
30 KiB
C++
838 lines
30 KiB
C++
/*
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**********************************************************************
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* Copyright (C) 1999, International Business Machines Corporation and others. All Rights Reserved.
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**********************************************************************
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* Date Name Description
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* 10/20/99 alan Creation.
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**********************************************************************
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*/
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#ifndef UNICODESET_H
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#define UNICODESET_H
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#include "unicode/unifilt.h"
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#include "unicode/utypes.h"
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#include "unicode/unistr.h"
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class ParsePosition;
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class SymbolTable;
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class TransliterationRuleParser;
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class TransliterationRule;
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/**
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* A mutable set of Unicode characters. Objects of this class
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* represent <em>character classes</em> used in regular expressions.
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* Such classes specify a subset of the set of all Unicode characters,
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* which in this implementation is the characters from U+0000 to
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* U+FFFF, ignoring surrogates.
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*
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* <p>This class supports two APIs. The first is modeled after Java 2's
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* <code>java.util.Set</code> interface, although this class does not
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* implement that interface. All methods of <code>Set</code> are
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* supported, with the modification that they take a character range
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* or single character instead of an <code>Object</code>, and they
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* take a <code>UnicodeSet</code> instead of a <code>Collection</code>.
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*
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* <p>The second API is the
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* <code>applyPattern()</code>/<code>toPattern()</code> API from the
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* <code>Format</code>-derived classes. Unlike the
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* methods that add characters, add categories, and control the logic
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* of the set, the method <code>applyPattern()</code> sets all
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* attributes of a <code>UnicodeSet</code> at once, based on a
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* string pattern.
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*
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* <p>In addition, the set complement operation is supported through
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* the <code>complement()</code> method.
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*
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* <p><b>Pattern syntax</b></p>
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*
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* Patterns are accepted by the constructors and the
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* <code>applyPattern()</code> methods and returned by the
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* <code>toPattern()</code> method. These patterns follow a syntax
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* similar to that employed by version 8 regular expression character
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* classes:
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*
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* <blockquote>
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* <table>
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* <tr align="top">
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* <td nowrap valign="top" align="right"><code>pattern := </code></td>
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* <td valign="top"><code>('[' '^'? item* ']') |
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* ('[:' '^'? category ':]')</code></td>
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* </tr>
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* <tr align="top">
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* <td nowrap valign="top" align="right"><code>item := </code></td>
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* <td valign="top"><code>char | (char '-' char) | pattern-expr<br>
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* </code></td>
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* </tr>
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* <tr align="top">
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* <td nowrap valign="top" align="right"><code>pattern-expr := </code></td>
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* <td valign="top"><code>pattern | pattern-expr pattern |
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* pattern-expr op pattern<br>
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* </code></td>
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* </tr>
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* <tr align="top">
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* <td nowrap valign="top" align="right"><code>op := </code></td>
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* <td valign="top"><code>'&' | '-'<br>
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* </code></td>
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* </tr>
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* <tr align="top">
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* <td nowrap valign="top" align="right"><code>special := </code></td>
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* <td valign="top"><code>'[' | ']' | '-'<br>
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* </code></td>
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* </tr>
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* <tr align="top">
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* <td nowrap valign="top" align="right"><code>char := </code></td>
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* <td valign="top"><em>any character that is not</em><code> special<br>
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* | ('\u005C' </code><em>any character</em><code>)<br>
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* | ('\u005Cu' hex hex hex hex)<br>
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* </code></td>
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* </tr>
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* <tr align="top">
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* <td nowrap valign="top" align="right"><code>hex := </code></td>
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* <td valign="top"><em>any character for which
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* </em><code>Character.digit(c, 16)</code><em>
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* returns a non-negative result</em></td>
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* </tr>
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* <tr>
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* <td nowrap valign="top" align="right"><code>category := </code></td>
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* <td valign="top"><code>'M' | 'N' | 'Z' | 'C' | 'L' | 'P' |
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* 'S' | 'Mn' | 'Mc' | 'Me' | 'Nd' | 'Nl' | 'No' | 'Zs' | 'Zl' |
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* 'Zp' | 'Cc' | 'Cf' | 'Cs' | 'Co' | 'Cn' | 'Lu' | 'Ll' | 'Lt'
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* | 'Lm' | 'Lo' | 'Pc' | 'Pd' | 'Ps' | 'Pe' | 'Po' | 'Sm' |
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* 'Sc' | 'Sk' | 'So'</code></td>
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* </tr>
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* </table>
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* <br>
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* <table border="1">
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* <tr>
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* <td>Legend: <table>
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* <tr>
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* <td nowrap valign="top"><code>a := b</code></td>
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* <td width="20" valign="top"> </td>
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* <td valign="top"><code>a</code> may be replaced by <code>b</code> </td>
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* </tr>
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* <tr>
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* <td nowrap valign="top"><code>a?</code></td>
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* <td valign="top"></td>
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* <td valign="top">zero or one instance of <code>a</code><br>
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* </td>
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* </tr>
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* <tr>
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* <td nowrap valign="top"><code>a*</code></td>
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* <td valign="top"></td>
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* <td valign="top">one or more instances of <code>a</code><br>
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* </td>
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* </tr>
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* <tr>
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* <td nowrap valign="top"><code>a | b</code></td>
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* <td valign="top"></td>
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* <td valign="top">either <code>a</code> or <code>b</code><br>
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* </td>
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* </tr>
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* <tr>
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* <td nowrap valign="top"><code>'a'</code></td>
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* <td valign="top"></td>
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* <td valign="top">the literal string between the quotes </td>
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* </tr>
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* </table>
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* </td>
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* </tr>
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* </table>
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* </blockquote>
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*
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* Any character may be preceded by a backslash in order to remove any special
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* meaning. White space characters, as defined by Character.isWhitespace(), are
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* ignored, unless they are escaped.
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*
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* Patterns specify individual characters, ranges of characters, and
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* Unicode character categories. When elements are concatenated, they
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* specify their union. To complement a set, place a '^' immediately
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* after the opening '[' or '[:'. In any other location, '^' has no
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* special meaning.
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*
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* <p>Ranges are indicated by placing two a '-' between two
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* characters, as in "a-z". This specifies the range of all
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* characters from the left to the right, in Unicode order. If the
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* left and right characters are the same, then the range consists of
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* just that character. If the left character is greater than the
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* right character it is a syntax error. If a '-' occurs as the first
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* character after the opening '[' or '[^', or if it occurs as the
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* last character before the closing ']', then it is taken as a
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* literal. Thus "[a\-b]", "[-ab]", and "[ab-]" all indicate the same
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* set of three characters, 'a', 'b', and '-'.
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*
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* <p>Sets may be intersected using the '&' operator or the asymmetric
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* set difference may be taken using the '-' operator, for example,
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* "[[:L:]&[\u0000-\u0FFF]]" indicates the set of all Unicode letters
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* with values less than 4096. Operators ('&' and '|') have equal
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* precedence and bind left-to-right. Thus
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* "[[:L:]-[a-z]-[\u0100-\u01FF]]" is equivalent to
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* "[[[:L:]-[a-z]]-[\u0100-\u01FF]]". This only really matters for
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* difference; intersection is commutative.
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*
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* <table>
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* <tr valign=top><td nowrap><code>[a]</code><td>The set containing 'a'
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* <tr valign=top><td nowrap><code>[a-z]</code><td>The set containing 'a'
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* through 'z' and all letters in between, in Unicode order
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* <tr valign=top><td nowrap><code>[^a-z]</code><td>The set containing
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* all characters but 'a' through 'z',
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* that is, U+0000 through 'a'-1 and 'z'+1 through U+FFFF
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* <tr valign=top><td nowrap><code>[[<em>pat1</em>][<em>pat2</em>]]</code>
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* <td>The union of sets specified by <em>pat1</em> and <em>pat2</em>
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* <tr valign=top><td nowrap><code>[[<em>pat1</em>]&[<em>pat2</em>]]</code>
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* <td>The intersection of sets specified by <em>pat1</em> and <em>pat2</em>
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* <tr valign=top><td nowrap><code>[[<em>pat1</em>]-[<em>pat2</em>]]</code>
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* <td>The asymmetric difference of sets specified by <em>pat1</em> and
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* <em>pat2</em>
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* <tr valign=top><td nowrap><code>[:Lu:]</code>
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* <td>The set of characters belonging to the given
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* Unicode category, as defined by <code>Character.getType()</code>; in
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* this case, Unicode uppercase letters
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* <tr valign=top><td nowrap><code>[:L:]</code>
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* <td>The set of characters belonging to all Unicode categories
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* starting wih 'L', that is, <code>[[:Lu:][:Ll:][:Lt:][:Lm:][:Lo:]]</code>.
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* </table>
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*
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* <p><b>Character categories.</b>
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*
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* Character categories are specified using the POSIX-like syntax
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* '[:Lu:]'. The complement of a category is specified by inserting
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* '^' after the opening '[:'. The following category names are
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* recognized. Actual determination of category data uses
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* <code>Unicode::getType()</code>, so it reflects the underlying
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* data used by <code>Unicode</code>.
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*
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* <pre>
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* Normative
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* Mn = Mark, Non-Spacing
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* Mc = Mark, Spacing Combining
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* Me = Mark, Enclosing
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*
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* Nd = Number, Decimal Digit
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* Nl = Number, Letter
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* No = Number, Other
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*
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* Zs = Separator, Space
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* Zl = Separator, Line
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* Zp = Separator, Paragraph
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*
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* Cc = Other, Control
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* Cf = Other, Format
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* Cs = Other, Surrogate
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* Co = Other, Private Use
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* Cn = Other, Not Assigned
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*
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* Informative
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* Lu = Letter, Uppercase
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* Ll = Letter, Lowercase
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* Lt = Letter, Titlecase
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* Lm = Letter, Modifier
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* Lo = Letter, Other
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*
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* Pc = Punctuation, Connector
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* Pd = Punctuation, Dash
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* Ps = Punctuation, Open
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* Pe = Punctuation, Close
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* Pi = Punctuation, Initial quote
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* Pf = Punctuation, Final quote
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* Po = Punctuation, Other
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*
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* Sm = Symbol, Math
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* Sc = Symbol, Currency
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* Sk = Symbol, Modifier
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* So = Symbol, Other
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* </pre>
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*
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* @author Alan Liu
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* @draft
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*/
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class U_I18N_API UnicodeSet : public UnicodeFilter {
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int32_t len; // length of list used; 0 <= len <= capacity
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int32_t capacity; // capacity of list
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int32_t bufferCapacity; // capacity of buffer
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UChar32* list; // MUST be terminated with HIGH
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UChar32* buffer; // internal buffer, may be NULL
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/**
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* The pattern representation of this set. This may not be the
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* most economical pattern. It is the pattern supplied to
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* applyPattern(), with variables substituted and whitespace
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* removed. For sets constructed without applyPattern(), or
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* modified using the non-pattern API, this string will be empty,
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* indicating that toPattern() must generate a pattern
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* representation from the inversion list.
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*/
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UnicodeString pat;
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#ifndef HPUX
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static const UChar32 HIGH; // HIGH > all valid values. 110000 for codepoints
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#endif
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static const UChar32 LOW; // LOW <= all valid values. ZERO for codepoints
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static const int32_t START_EXTRA; // initial storage. Must be >= 0
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static const int32_t GROW_EXTRA; // extra amount for growth. Must be >= 0
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static const UnicodeString CATEGORY_NAMES;
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/**
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* A cache mapping character category integers, as returned by
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* Unicode::getType(), to pairs strings. Entries are initially
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* zero length and are filled in on demand.
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*/
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static UnicodeSet* CATEGORY_CACHE;
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/**
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* Delimiter string used in patterns to close a category reference:
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* ":]". Example: "[:Lu:]".
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*/
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static const UChar CATEGORY_CLOSE[];
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// More special characters...
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static const UChar SET_OPEN;
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static const UChar SET_CLOSE;
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static const UChar HYPHEN;
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static const UChar COMPLEMENT;
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static const UChar COLON;
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static const UChar BACKSLASH;
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static const UChar INTERSECTION;
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static const UChar UPPER_U;
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public:
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/**
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* Minimum value that can be stored in a UnicodeSet.
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*/
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static const UChar32 MIN_VALUE;
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/**
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* Maximum value that can be stored in a UnicodeSet.
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*/
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static const UChar32 MAX_VALUE;
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//----------------------------------------------------------------
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// Constructors &c
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//----------------------------------------------------------------
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public:
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/**
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* Constructs an empty set.
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* @draft
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*/
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UnicodeSet();
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/**
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* Constructs a set containing the given range. If <code>end >
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* start</code> then an empty set is created.
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*
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* @param start first character, inclusive, of range
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* @param end last character, inclusive, of range
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*/
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UnicodeSet(UChar32 start, UChar32 end);
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/**
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* Constructs a set from the given pattern. See the class
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* description for the syntax of the pattern language.
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* @param pattern a string specifying what characters are in the set
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* @exception <code>IllegalArgumentException</code> if the pattern
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* contains a syntax error.
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* @draft
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*/
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UnicodeSet(const UnicodeString& pattern,
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UErrorCode& status);
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/**
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* Constructs a set from the given Unicode character category.
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* @param category an integer indicating the character category as
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* returned by <code>Character.getType()</code>.
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* @exception <code>IllegalArgumentException</code> if the given
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* category is invalid.
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* @draft
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*/
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UnicodeSet(int8_t category, UErrorCode& status);
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/**
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* Constructs a set that is identical to the given UnicodeSet.
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* @draft
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*/
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UnicodeSet(const UnicodeSet& o);
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/**
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* Destructs the set.
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* @draft
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*/
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virtual ~UnicodeSet();
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/**
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* Assigns this object to be a copy of another.
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* @draft
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*/
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UnicodeSet& operator=(const UnicodeSet& o);
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/**
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* Compares the specified object with this set for equality. Returns
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* <tt>true</tt> if the two sets
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* have the same size, and every member of the specified set is
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* contained in this set (or equivalently, every member of this set is
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* contained in the specified set).
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*
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* @param o set to be compared for equality with this set.
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* @return <tt>true</tt> if the specified set is equal to this set.
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* @draft
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*/
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virtual UBool operator==(const UnicodeSet& o) const;
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/**
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* Compares the specified object with this set for equality. Returns
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* <tt>true</tt> if the specified set is not equal to this set.
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* @draft
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*/
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UBool operator!=(const UnicodeSet& o) const;
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/**
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* Returns a copy of this object. All UnicodeFilter objects have
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* to support cloning in order to allow classes using
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* UnicodeFilters, such as Transliterator, to implement cloning.
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* @draft
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*/
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virtual UnicodeFilter* clone() const;
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/**
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* Returns the hash code value for this set.
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*
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* @return the hash code value for this set.
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* @see Object#hashCode()
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* @draft
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*/
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virtual int32_t hashCode(void) const;
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//----------------------------------------------------------------
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// Public API
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//----------------------------------------------------------------
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/**
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* Make this object represent the range <code>start - end</code>.
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* If <code>end > start</code> then this object is set to an
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* an empty range.
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*
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* @param start first character in the set, inclusive
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* @rparam end last character in the set, inclusive
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*/
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void set(UChar32 start, UChar32 end);
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/**
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* Modifies this set to represent the set specified by the given
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* pattern, optionally ignoring white space. See the class
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* description for the syntax of the pattern language.
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* @param pattern a string specifying what characters are in the set
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* @exception <code>IllegalArgumentException</code> if the pattern
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* contains a syntax error.
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* @draft
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*/
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virtual void applyPattern(const UnicodeString& pattern,
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UErrorCode& status);
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/**
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* Returns a string representation of this set. If the result of
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* calling this function is passed to a UnicodeSet constructor, it
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* will produce another set that is equal to this one.
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* @param result the string to receive the rules. Previous
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* contents will be deleted.
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* @param escapeUnprintable if TRUE then convert unprintable
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* character to their hex escape representations, \uxxxx or
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* \Uxxxxxxxx. Unprintable characters are those other than
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* U+000A, U+0020..U+007E.
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* @draft
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*/
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virtual UnicodeString& toPattern(UnicodeString& result,
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UBool escapeUnprintable = FALSE) const;
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/**
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* Returns the number of elements in this set (its cardinality),
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* <em>n</em>, where <code>0 <= </code><em>n</em><code> <= 65536</code>.
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*
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* @return the number of elements in this set (its cardinality).
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* @draft
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*/
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virtual int32_t size(void) const;
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/**
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* Returns <tt>true</tt> if this set contains no elements.
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*
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* @return <tt>true</tt> if this set contains no elements.
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* @draft
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*/
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virtual UBool isEmpty(void) const;
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/**
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* Returns <tt>true</tt> if this set contains the specified range
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* of chars.
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*
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* @return <tt>true</tt> if this set contains the specified range
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* of chars.
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* @draft
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*/
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virtual UBool contains(UChar32 start, UChar32 end) const;
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/**
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* Returns <tt>true</tt> if this set contains the specified char.
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*
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* @return <tt>true</tt> if this set contains the specified char.
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* @draft
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*/
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virtual UBool contains(UChar32 c) const;
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|
|
|
/**
|
|
* Implement UnicodeFilter:
|
|
* Returns <tt>true</tt> if this set contains the specified char.
|
|
*
|
|
* @return <tt>true</tt> if this set contains the specified char.
|
|
* @draft
|
|
*/
|
|
virtual UBool contains(UChar c) const;
|
|
|
|
/**
|
|
* Adds the specified range to this set if it is not already
|
|
* present. If this set already contains the specified range,
|
|
* the call leaves this set unchanged. If <code>end > start</code>
|
|
* then an empty range is added, leaving the set unchanged.
|
|
* This is equivalent to a boolean logic OR, or a set UNION.
|
|
*
|
|
* @param start first character, inclusive, of range to be added
|
|
* to this set.
|
|
* @param end last character, inclusive, of range to be added
|
|
* to this set.
|
|
* @draft
|
|
*/
|
|
virtual void add(UChar32 start, UChar32 end);
|
|
|
|
/**
|
|
* Adds the specified character to this set if it is not already
|
|
* present. If this set already contains the specified character,
|
|
* the call leaves this set unchanged.
|
|
* @draft
|
|
*/
|
|
void add(UChar32 c);
|
|
|
|
/**
|
|
* Retain only the elements in this set that are contained in the
|
|
* specified range. If <code>end > start</code> then an empty range is
|
|
* retained, leaving the set empty. This is equivalent to
|
|
* a boolean logic AND, or a set INTERSECTION.
|
|
*
|
|
* @param start first character, inclusive, of range to be retained
|
|
* to this set.
|
|
* @param end last character, inclusive, of range to be retained
|
|
* to this set.
|
|
*/
|
|
virtual void retain(UChar32 start, UChar32 end);
|
|
|
|
|
|
/**
|
|
* Retain the specified character from this set if it is present.
|
|
*/
|
|
void retain(UChar32 c);
|
|
|
|
/**
|
|
* Removes the specified range from this set if it is present.
|
|
* The set will not contain the specified range once the call
|
|
* returns. If <code>end > start</code> then an empty range is
|
|
* removed, leaving the set unchanged.
|
|
*
|
|
* @param start first character, inclusive, of range to be removed
|
|
* from this set.
|
|
* @param end last character, inclusive, of range to be removed
|
|
* from this set.
|
|
* @draft
|
|
*/
|
|
virtual void remove(UChar32 start, UChar32 end);
|
|
|
|
/**
|
|
* Removes the specified character from this set if it is present.
|
|
* The set will not contain the specified range once the call
|
|
* returns.
|
|
* @draft
|
|
*/
|
|
void remove(UChar32 c);
|
|
|
|
/**
|
|
* Inverts this set. This operation modifies this set so that
|
|
* its value is its complement. This is equivalent to
|
|
* <code>complement(MIN_VALUE, MAX_VALUE)</code>.
|
|
* @draft
|
|
*/
|
|
virtual void complement(void);
|
|
|
|
/**
|
|
* Complements the specified range in this set. Any character in
|
|
* the range will be removed if it is in this set, or will be
|
|
* added if it is not in this set. If <code>end > start</code>
|
|
* then an empty range is complemented, leaving the set unchanged.
|
|
* This is equivalent to a boolean logic XOR.
|
|
*
|
|
* @param start first character, inclusive, of range to be removed
|
|
* from this set.
|
|
* @param end last character, inclusive, of range to be removed
|
|
* from this set.
|
|
*/
|
|
virtual void complement(UChar32 start, UChar32 end);
|
|
|
|
|
|
/**
|
|
* Complements the specified character in this set. The character
|
|
* will be removed if it is in this set, or will be added if it is
|
|
* not in this set.
|
|
*/
|
|
void complement(UChar32 c);
|
|
|
|
/**
|
|
* Returns <tt>true</tt> if the specified set is a <i>subset</i>
|
|
* of this set.
|
|
*
|
|
* @param c set to be checked for containment in this set.
|
|
* @return <tt>true</tt> if this set contains all of the elements of the
|
|
* specified set.
|
|
* @draft
|
|
*/
|
|
virtual UBool containsAll(const UnicodeSet& c) const;
|
|
|
|
/**
|
|
* Adds all of the elements in the specified set to this set if
|
|
* they're not already present. This operation effectively
|
|
* modifies this set so that its value is the <i>union</i> of the two
|
|
* sets. The behavior of this operation is unspecified if the specified
|
|
* collection is modified while the operation is in progress.
|
|
*
|
|
* @param c set whose elements are to be added to this set.
|
|
* @see #add(char, char)
|
|
* @draft
|
|
*/
|
|
virtual void addAll(const UnicodeSet& c);
|
|
|
|
/**
|
|
* Retains only the elements in this set that are contained in the
|
|
* specified set. In other words, removes from this set all of
|
|
* its elements that are not contained in the specified set. This
|
|
* operation effectively modifies this set so that its value is
|
|
* the <i>intersection</i> of the two sets.
|
|
*
|
|
* @param c set that defines which elements this set will retain.
|
|
* @draft
|
|
*/
|
|
virtual void retainAll(const UnicodeSet& c);
|
|
|
|
/**
|
|
* Removes from this set all of its elements that are contained in the
|
|
* specified set. This operation effectively modifies this
|
|
* set so that its value is the <i>asymmetric set difference</i> of
|
|
* the two sets.
|
|
*
|
|
* @param c set that defines which elements will be removed from
|
|
* this set.
|
|
* @draft
|
|
*/
|
|
virtual void removeAll(const UnicodeSet& c);
|
|
|
|
/**
|
|
* Complements in this set all elements contained in the specified
|
|
* set. Any character in the other set will be removed if it is
|
|
* in this set, or will be added if it is not in this set.
|
|
*
|
|
* @param c set that defines which elements will be xor'ed from
|
|
* this set.
|
|
*/
|
|
virtual void complementAll(const UnicodeSet& c);
|
|
|
|
/**
|
|
* Removes all of the elements from this set. This set will be
|
|
* empty after this call returns.
|
|
* @draft
|
|
*/
|
|
virtual void clear(void);
|
|
|
|
/**
|
|
* Iteration method that returns the number of ranges contained in
|
|
* this set.
|
|
* @see #getRangeStart
|
|
* @see #getRangeEnd
|
|
*/
|
|
virtual int32_t getRangeCount(void) const;
|
|
|
|
/**
|
|
* Iteration method that returns the first character in the
|
|
* specified range of this set.
|
|
* @see #getRangeCount
|
|
* @see #getRangeEnd
|
|
*/
|
|
virtual UChar32 getRangeStart(int32_t index) const;
|
|
|
|
/**
|
|
* Iteration method that returns the last character in the
|
|
* specified range of this set.
|
|
* @see #getRangeStart
|
|
* @see #getRangeEnd
|
|
*/
|
|
virtual UChar32 getRangeEnd(int32_t index) const;
|
|
|
|
/**
|
|
* Reallocate this objects internal structures to take up the least
|
|
* possible space, without changing this object's value.
|
|
*/
|
|
virtual void compact();
|
|
|
|
private:
|
|
|
|
//----------------------------------------------------------------
|
|
// RuleBasedTransliterator support
|
|
//----------------------------------------------------------------
|
|
|
|
friend class Transliterator;
|
|
friend class TransliterationRuleParser;
|
|
friend class TransliterationRule;
|
|
|
|
/**
|
|
* Constructs a set from the given pattern. See the class description
|
|
* for the syntax of the pattern language.
|
|
|
|
* @param pattern a string specifying what characters are in the set
|
|
* @param pos on input, the position in pattern at which to start parsing.
|
|
* On output, the position after the last character parsed.
|
|
* @param varNameToChar a mapping from variable names (String) to characters
|
|
* (Character). May be null. If varCharToSet is non-null, then names may
|
|
* map to either single characters or sets, depending on whether a mapping
|
|
* exists in varCharToSet. If varCharToSet is null then all names map to
|
|
* single characters.
|
|
* @param varCharToSet a mapping from characters (Character objects from
|
|
* varNameToChar) to UnicodeSet objects. May be null. Is only used if
|
|
* varNameToChar is also non-null.
|
|
* @exception <code>IllegalArgumentException</code> if the pattern
|
|
* contains a syntax error.
|
|
*/
|
|
UnicodeSet(const UnicodeString& pattern, ParsePosition& pos,
|
|
const SymbolTable& symbols,
|
|
UErrorCode& status);
|
|
|
|
/**
|
|
* Returns <tt>true</tt> if this set contains any character whose low byte
|
|
* is the given value. This is used by <tt>RuleBasedTransliterator</tt> for
|
|
* indexing.
|
|
*/
|
|
UBool containsIndexValue(uint8_t v) const;
|
|
|
|
private:
|
|
|
|
//----------------------------------------------------------------
|
|
// Implementation: Pattern parsing
|
|
//----------------------------------------------------------------
|
|
|
|
/**
|
|
* Parses the given pattern, starting at the given position. The
|
|
* character at pattern.charAt(pos.getIndex()) must be '[', or the
|
|
* parse fails. Parsing continues until the corresponding closing
|
|
* ']'. If a syntax error is encountered between the opening and
|
|
* closing brace, the parse fails. Upon return from a successful
|
|
* parse, the ParsePosition is updated to point to the character
|
|
* following the closing ']', and a StringBuffer containing a
|
|
* pairs list for the parsed pattern is returned. This method calls
|
|
* itself recursively to parse embedded subpatterns.
|
|
*
|
|
* @param pattern the string containing the pattern to be parsed.
|
|
* The portion of the string from pos.getIndex(), which must be a
|
|
* '[', to the corresponding closing ']', is parsed.
|
|
* @param pos upon entry, the position at which to being parsing.
|
|
* The character at pattern.charAt(pos.getIndex()) must be a '['.
|
|
* Upon return from a successful parse, pos.getIndex() is either
|
|
* the character after the closing ']' of the parsed pattern, or
|
|
* pattern.length() if the closing ']' is the last character of
|
|
* the pattern string.
|
|
* @return a StringBuffer containing a pairs list for the parsed
|
|
* substring of <code>pattern</code>
|
|
* @exception IllegalArgumentException if the parse fails.
|
|
*/
|
|
void applyPattern(const UnicodeString& pattern,
|
|
ParsePosition& pos,
|
|
const SymbolTable* symbols,
|
|
UErrorCode& status);
|
|
|
|
//----------------------------------------------------------------
|
|
// Implementation: Generation of pairs for Unicode categories
|
|
//----------------------------------------------------------------
|
|
|
|
/**
|
|
* Sets this object to the given category, given its name.
|
|
* The category name must be either a two-letter name, such as
|
|
* "Lu", or a one letter name, such as "L". One-letter names
|
|
* indicate the logical union of all two-letter names that start
|
|
* with that letter. Case is significant. If the name starts
|
|
* with the character '^' then the complement of the given
|
|
* character set is returned.
|
|
*
|
|
* Although individual categories such as "Lu" are cached, we do
|
|
* not currently cache single-letter categories such as "L" or
|
|
* complements such as "^Lu" or "^L". It would be easy to cache
|
|
* these as well in a hashtable should the need arise.
|
|
*/
|
|
void applyCategory(const UnicodeString& catName,
|
|
UErrorCode& status);
|
|
|
|
/**
|
|
* Returns a pairs string for the given category. This string is
|
|
* cached and returned again if this method is called again with
|
|
* the same parameter.
|
|
*/
|
|
static const UnicodeSet& getCategorySet(int8_t cat);
|
|
|
|
//----------------------------------------------------------------
|
|
// Implementation: Utility methods
|
|
//----------------------------------------------------------------
|
|
|
|
/**
|
|
* Returns the character after the given position, or '\uFFFE' if
|
|
* there is none.
|
|
*/
|
|
static UChar charAfter(const UnicodeString& str, int32_t i);
|
|
|
|
void ensureCapacity(int32_t newLen);
|
|
|
|
void ensureBufferCapacity(int32_t newLen);
|
|
|
|
void swapBuffers(void);
|
|
|
|
static const UChar HEX[16];
|
|
|
|
void _applyPattern(const UnicodeString& pattern,
|
|
ParsePosition& pos,
|
|
const SymbolTable* symbols,
|
|
UnicodeString& rebuiltPat,
|
|
UErrorCode& status);
|
|
|
|
UnicodeString& _toPattern(UnicodeString& result,
|
|
UBool escapeUnprintable) const;
|
|
|
|
UnicodeString& _generatePattern(UnicodeString& result,
|
|
UBool escapeUnprintable) const;
|
|
|
|
static void _appendToPat(UnicodeString& buf, UChar32 c, UBool escapeUnprintable);
|
|
|
|
static UBool _isUnprintable(UChar32 c);
|
|
|
|
static UBool _escapeUnprintable(UnicodeString& result, UChar32 c);
|
|
|
|
//----------------------------------------------------------------
|
|
// Implementation: Fundamental operators
|
|
//----------------------------------------------------------------
|
|
|
|
void exclusiveOr(const UChar32* other, int32_t otherLen, int8_t polarity);
|
|
|
|
void add(const UChar32* other, int32_t otherLen, int8_t polarity);
|
|
|
|
void retain(const UChar32* other, int32_t otherLen, int8_t polarity);
|
|
};
|
|
|
|
inline UBool UnicodeSet::operator!=(const UnicodeSet& o) const {
|
|
return !operator==(o);
|
|
}
|
|
|
|
#endif
|