588 lines
23 KiB
C++
588 lines
23 KiB
C++
#ifndef UNICODESET_H
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#define UNICODESET_H
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#include "utypes.h"
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#include "unistr.h"
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#include "parsepos.h"
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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>java.text.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><code>
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* pattern := ('[' '^'? item* ']') | ('[:' '^'? category ':]')<br>
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* item := char | (char '-' char) | pattern-expr<br>
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* pattern-expr := pattern | pattern-expr pattern | pattern-expr op pattern<br>
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* op := '&' | '-'<br>
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* special := '[' | ']' | '-'<br>
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* char := <em>any character that is not</em> special |
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* ('\' <em>any character</em>) |
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* ('\\u' hex hex hex hex)<br>
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* hex := <em>any hex digit, as defined by </em>Character.digit(c, 16)
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* </code>
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*
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* <br>Legend:
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*
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* <table>
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* <tr><td width=20%><code>a:=b</code>
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* <td><code>a</code> may be replaced by
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* <code>b</code>
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* <tr><td><code>a?</code>
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* <td>zero or one instance of <code>a</code><br>
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* <tr><td><code>a*</code>
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* <td>one or more instances of <code>a</code><br>
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* <tr><td><code>a|b</code>
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* <td>either <code>a</code> or <code>b</code><br>
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* <tr><td><code>'a'</code>
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* <td>the literal string between the quotes
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* </table>
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* </blockquote>
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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>Character.getType()</code>, so it reflects the underlying
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* implmementation used by <code>Character</code>. As of Java 2 and
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* JDK 1.1.8, this is Unicode <b>2.x.x - fill in version here</b>.
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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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* *Unsupported by Java (and hence unsupported by UnicodeSet).
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*
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* @author Alan Liu
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* @version $RCSfile: uniset.h,v $ $Revision: 1.1 $ $Date: 1999/10/20 22:06:52 $
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*/
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class U_I18N_API UnicodeSet {
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/**
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* The internal representation is a StringBuffer of even length.
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* Each pair of characters represents a range that is included in
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* the set. A single character c is represented as cc. Thus, the
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* ranges in the set are (a,b), a and b inclusive, where a =
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* pairs.charAt(i) and b = pairs.charAt(i+1) for all even i, 0 <=
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* i <= pairs.length()-2. Pairs are always stored in ascending
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* Unicode order. Pairs are always stored in shortest form. For
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* example, if the pair "hh", representing the single character
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* 'h', is added to the pairs list "agik", representing the ranges
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* 'a'-'g' and 'i'-'k', the result is "ak", not "aghhik".
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*/
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UnicodeString pairs;
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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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* Character.getType(), to pairs strings. Entries are initially
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* null and are created on demand.
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*/
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static UnicodeString* CATEGORY_PAIRS_CACHE;
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//----------------------------------------------------------------
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// Debugging and testing
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//----------------------------------------------------------------
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public:
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/**
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* Return the representation of this set as a list of character
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* ranges. Ranges are listed in ascending Unicode order. For
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* example, the set [a-zA-M3] is represented as "33AMaz".
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*/
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const UnicodeString& getPairs() const;
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//----------------------------------------------------------------
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// Public API
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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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*/
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UnicodeSet();
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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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*/
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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 pattern, optionally ignoring
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* white space. See the class description for the syntax of the
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* pattern language.
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* @param pattern a string specifying what characters are in the set
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* @param ignoreSpaces if <code>true</code>, all spaces in the
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* pattern are ignored, except those preceded by '\\'. Spaces are
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* those characters for which <code>Character.isSpaceChar()</code>
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* is <code>true</code>.
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* @exception <code>IllegalArgumentException</code> if the pattern
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* contains a syntax error.
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*/
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UnicodeSet(const UnicodeString& pattern, bool_t ignoreSpaces,
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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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*/
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UnicodeSet(int8_t category, UErrorCode& status);
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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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* @param ignoreSpaces if <code>true</code>, all spaces in the
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* pattern are ignored. Spaces are those characters for which
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* <code>Character.isSpaceChar()</code> is <code>true</code>.
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* Characters preceded by '\\' are escaped, losing any special
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* meaning they otherwise have. Spaces may be included by
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* escaping them.
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* @exception <code>IllegalArgumentException</code> if the pattern
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* contains a syntax error.
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*/
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virtual void applyPattern(const UnicodeString& pattern,
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bool_t ignoreSpaces,
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UErrorCode& status);
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/**
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* Modifies this set to represent the set specified by the given
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* pattern. See the class description for the syntax of the pattern
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* 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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*/
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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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*/
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virtual UnicodeString& toPattern(UnicodeString& result) const;
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/**
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* Returns the number of elements in this set (its cardinality). If this
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* set contains more than <tt>Integer.MAX_VALUE</tt> elements, returns
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* <tt>Integer.MAX_VALUE</tt>.
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*
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* @return the number of elements in this set (its cardinality).
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*/
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virtual int32_t size() 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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*/
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virtual bool_t isEmpty() 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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*/
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virtual bool_t contains(UChar first, UChar last) 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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*/
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virtual bool_t contains(UChar c) const;
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/**
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* Adds the specified range to this set if it is not already
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* present. If this set already contains the specified range,
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* the call leaves this set unchanged. If <code>last > first</code>
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* then an empty range is added, leaving the set unchanged.
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*
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* @param first first character, inclusive, of range to be added
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* to this set.
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* @param last last character, inclusive, of range to be added
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* to this set.
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*/
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virtual void add(UChar first, UChar last);
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/**
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* Adds the specified character to this set if it is not already
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* present. If this set already contains the specified character,
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* the call leaves this set unchanged.
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*/
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virtual void add(UChar c);
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/**
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* Removes the specified range from this set if it is present.
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* The set will not contain the specified range once the call
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* returns. If <code>last > first</code> then an empty range is
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* removed, leaving the set unchanged.
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*
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* @param first first character, inclusive, of range to be removed
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* from this set.
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* @param last last character, inclusive, of range to be removed
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* from this set.
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*/
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virtual void remove(UChar first, UChar last);
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/**
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* Removes the specified character from this set if it is present.
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* The set will not contain the specified range once the call
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* returns.
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*/
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virtual void remove(UChar c);
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/**
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* Returns <tt>true</tt> if the specified set is a <i>subset</i>
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* of this set.
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*
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* @param c set to be checked for containment in this set.
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* @return <tt>true</tt> if this set contains all of the elements of the
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* specified set.
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*/
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virtual bool_t containsAll(const UnicodeSet& c) const;
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/**
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* Adds all of the elements in the specified set to this set if
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* they're not already present. This operation effectively
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* modifies this set so that its value is the <i>union</i> of the two
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* sets. The behavior of this operation is unspecified if the specified
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* collection is modified while the operation is in progress.
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*
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* @param c set whose elements are to be added to this set.
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* @see #add(char, char)
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*/
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virtual void addAll(const UnicodeSet& c);
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/**
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* Retains only the elements in this set that are contained in the
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* specified set. In other words, removes from this set all of
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* its elements that are not contained in the specified set. This
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* operation effectively modifies this set so that its value is
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* the <i>intersection</i> of the two sets.
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*
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* @param c set that defines which elements this set will retain.
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*/
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virtual void retainAll(const UnicodeSet& c);
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/**
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* Removes from this set all of its elements that are contained in the
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* specified set. This operation effectively modifies this
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* set so that its value is the <i>asymmetric set difference</i> of
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* the two sets.
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*
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* @param c set that defines which elements will be removed from
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* this set.
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*/
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virtual void removeAll(const UnicodeSet& c);
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/**
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* Inverts this set. This operation modifies this set so that
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* its value is its complement. This is equivalent to the pseudo code:
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* <code>this = new CharSet("[\u0000-\uFFFF]").removeAll(this)</code>.
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*/
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virtual void complement();
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/**
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* Removes all of the elements from this set. This set will be
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* empty after this call returns.
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*/
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virtual void clear();
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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 object is also a set, 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 Object to be compared for equality with this set.
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* @return <tt>true</tt> if the specified Object is equal to this set.
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*/
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virtual bool_t operator==(const UnicodeSet& o) const;
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bool_t operator!=(const UnicodeSet& o) 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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*/
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virtual int32_t hashCode() const;
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//----------------------------------------------------------------
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// Implementation: Pattern parsing
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//----------------------------------------------------------------
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private:
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/**
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* Parses the given pattern, starting at the given position. The
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* character at pattern.charAt(pos.getIndex()) must be '[', or the
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* parse fails. Parsing continues until the corresponding closing
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* ']'. If a syntax error is encountered between the opening and
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* closing brace, the parse fails. Upon return from a successful
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* parse, the ParsePosition is updated to point to the character
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* following the closing ']', and a StringBuffer containing a
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* pairs list for the parsed pattern is returned. This method calls
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* itself recursively to parse embedded subpatterns.
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*
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* @param pattern the string containing the pattern to be parsed.
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* The portion of the string from pos.getIndex(), which must be a
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* '[', to the corresponding closing ']', is parsed.
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* @param pos upon entry, the position at which to being parsing.
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* The character at pattern.charAt(pos.getIndex()) must be a '['.
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* Upon return from a successful parse, pos.getIndex() is either
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* the character after the closing ']' of the parsed pattern, or
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* pattern.length() if the closing ']' is the last character of
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* the pattern string.
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* @return a StringBuffer containing a pairs list for the parsed
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* substring of <code>pattern</code>
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* @exception IllegalArgumentException if the parse fails.
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*/
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static UnicodeString& parse(UnicodeString& pairsBuf /*result*/,
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const UnicodeString& pattern,
|
|
ParsePosition& pos,
|
|
UErrorCode& status);
|
|
|
|
//----------------------------------------------------------------
|
|
// Implementation: Efficient in-place union & difference
|
|
//----------------------------------------------------------------
|
|
|
|
/**
|
|
* Performs a union operation: adds the range 'c'-'d' to the given
|
|
* pairs list. The pairs list is modified in place. The result
|
|
* is normalized (in order and as short as possible). For
|
|
* example, addPair("am", 'l', 'q') => "aq". addPair("ampz", 'n',
|
|
* 'o') => "az".
|
|
*/
|
|
static void addPair(UnicodeString& pairs, UChar c, UChar d);
|
|
|
|
/**
|
|
* Performs an asymmetric difference: removes the range 'c'-'d'
|
|
* from the pairs list. The pairs list is modified in place. The
|
|
* result is normalized (in order and as short as possible). For
|
|
* example, removePair("am", 'l', 'q') => "ak".
|
|
* removePair("ampz", 'l', 'q') => "akrz".
|
|
*/
|
|
static void removePair(UnicodeString& pairs, UChar c, UChar d);
|
|
|
|
//----------------------------------------------------------------
|
|
// Implementation: Fundamental operators
|
|
//----------------------------------------------------------------
|
|
|
|
/**
|
|
* Changes the pairs list to represent the complement of the set it
|
|
* currently represents. The pairs list will be normalized (in
|
|
* order and in shortest possible form) if the original pairs list
|
|
* was normalized.
|
|
*/
|
|
static void doComplement(UnicodeString& pairs);
|
|
|
|
/**
|
|
* Given two pairs lists, changes the first in place to represent
|
|
* the union of the two sets.
|
|
*/
|
|
static void doUnion(UnicodeString& pairs, const UnicodeString& c2);
|
|
|
|
/**
|
|
* Given two pairs lists, changes the first in place to represent
|
|
* the asymmetric difference of the two sets.
|
|
*/
|
|
static void doDifference(UnicodeString& pairs, const UnicodeString& pairs2);
|
|
|
|
/**
|
|
* Given two pairs lists, changes the first in place to represent
|
|
* the intersection of the two sets.
|
|
*/
|
|
static void doIntersection(UnicodeString& pairs, const UnicodeString& c2);
|
|
|
|
//----------------------------------------------------------------
|
|
// Implementation: Generation of pairs for Unicode categories
|
|
//----------------------------------------------------------------
|
|
|
|
/**
|
|
* Returns a pairs string for 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.
|
|
*/
|
|
static UnicodeString& getCategoryPairs(UnicodeString& result,
|
|
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 UnicodeString& getCategoryPairs(int8_t cat);
|
|
|
|
//----------------------------------------------------------------
|
|
// Implementation: Utility methods
|
|
//----------------------------------------------------------------
|
|
|
|
/**
|
|
* Returns the character after the given position, or '\uFFFF' if
|
|
* there is none.
|
|
*/
|
|
static UChar charAfter(const UnicodeString& str, int32_t i);
|
|
|
|
/**
|
|
* TEMPORARY WORKAROUND UNTIL Unicode::digit() exists.
|
|
* Return the digit value of the given UChar, or -1. The radix
|
|
* value is ignored for now and hardcoded as 16.
|
|
*/
|
|
static int8_t digit(UChar c, int8_t radix);
|
|
};
|
|
|
|
inline void UnicodeSet::applyPattern(const UnicodeString& pattern,
|
|
UErrorCode& status) {
|
|
applyPattern(pattern, FALSE, status);
|
|
}
|
|
|
|
inline bool_t UnicodeSet::operator!=(const UnicodeSet& o) const {
|
|
return !operator==(o);
|
|
}
|
|
|
|
#endif
|