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comparison: intl/icu/source/common/unicode/unimatch.h

intl/icu/source/common/unicode/unimatch.h

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1 /*
2 * Copyright (C) 2001-2005, International Business Machines Corporation and others. All Rights Reserved.
3 **********************************************************************
4 * Date Name Description
5 * 07/18/01 aliu Creation.
6 **********************************************************************
7 */
8 #ifndef UNIMATCH_H
9 #define UNIMATCH_H
10
11 #include "unicode/utypes.h"
12
13 /**
14 * \file
15 * \brief C++ API: Unicode Matcher
16 */
17
18
19 U_NAMESPACE_BEGIN
20
21 class Replaceable;
22 class UnicodeString;
23 class UnicodeSet;
24
25 /**
26 * Constants returned by <code>UnicodeMatcher::matches()</code>
27 * indicating the degree of match.
28 * @stable ICU 2.4
29 */
30 enum UMatchDegree {
31 /**
32 * Constant returned by <code>matches()</code> indicating a
33 * mismatch between the text and this matcher. The text contains
34 * a character which does not match, or the text does not contain
35 * all desired characters for a non-incremental match.
36 * @stable ICU 2.4
37 */
38 U_MISMATCH,
39
40 /**
41 * Constant returned by <code>matches()</code> indicating a
42 * partial match between the text and this matcher. This value is
43 * only returned for incremental match operations. All characters
44 * of the text match, but more characters are required for a
45 * complete match. Alternatively, for variable-length matchers,
46 * all characters of the text match, and if more characters were
47 * supplied at limit, they might also match.
48 * @stable ICU 2.4
49 */
50 U_PARTIAL_MATCH,
51
52 /**
53 * Constant returned by <code>matches()</code> indicating a
54 * complete match between the text and this matcher. For an
55 * incremental variable-length match, this value is returned if
56 * the given text matches, and it is known that additional
57 * characters would not alter the extent of the match.
58 * @stable ICU 2.4
59 */
60 U_MATCH
61 };
62
63 /**
64 * <code>UnicodeMatcher</code> defines a protocol for objects that can
65 * match a range of characters in a Replaceable string.
66 * @stable ICU 2.4
67 */
68 class U_COMMON_API UnicodeMatcher /* not : public UObject because this is an interface/mixin class */ {
69
70 public:
71 /**
72 * Destructor.
73 * @stable ICU 2.4
74 */
75 virtual ~UnicodeMatcher();
76
77 /**
78 * Return a UMatchDegree value indicating the degree of match for
79 * the given text at the given offset. Zero, one, or more
80 * characters may be matched.
81 *
82 * Matching in the forward direction is indicated by limit >
83 * offset. Characters from offset forwards to limit-1 will be
84 * considered for matching.
85 *
86 * Matching in the reverse direction is indicated by limit <
87 * offset. Characters from offset backwards to limit+1 will be
88 * considered for matching.
89 *
90 * If limit == offset then the only match possible is a zero
91 * character match (which subclasses may implement if desired).
92 *
93 * As a side effect, advance the offset parameter to the limit of
94 * the matched substring. In the forward direction, this will be
95 * the index of the last matched character plus one. In the
96 * reverse direction, this will be the index of the last matched
97 * character minus one.
98 *
99 * <p>Note: This method is not const because some classes may
100 * modify their state as the result of a match.
101 *
102 * @param text the text to be matched
103 * @param offset on input, the index into text at which to begin
104 * matching. On output, the limit of the matched text. The
105 * number of matched characters is the output value of offset
106 * minus the input value. Offset should always point to the
107 * HIGH SURROGATE (leading code unit) of a pair of surrogates,
108 * both on entry and upon return.
109 * @param limit the limit index of text to be matched. Greater
110 * than offset for a forward direction match, less than offset for
111 * a backward direction match. The last character to be
112 * considered for matching will be text.charAt(limit-1) in the
113 * forward direction or text.charAt(limit+1) in the backward
114 * direction.
115 * @param incremental if TRUE, then assume further characters may
116 * be inserted at limit and check for partial matching. Otherwise
117 * assume the text as given is complete.
118 * @return a match degree value indicating a full match, a partial
119 * match, or a mismatch. If incremental is FALSE then
120 * U_PARTIAL_MATCH should never be returned.
121 * @stable ICU 2.4
122 */
123 virtual UMatchDegree matches(const Replaceable& text,
124 int32_t& offset,
125 int32_t limit,
126 UBool incremental) = 0;
127
128 /**
129 * Returns a string representation of this matcher. If the result of
130 * calling this function is passed to the appropriate parser, it
131 * will produce another matcher that is equal to this one.
132 * @param result the string to receive the pattern. Previous
133 * contents will be deleted.
134 * @param escapeUnprintable if TRUE then convert unprintable
135 * character to their hex escape representations, \\uxxxx or
136 * \\Uxxxxxxxx. Unprintable characters are those other than
137 * U+000A, U+0020..U+007E.
138 * @stable ICU 2.4
139 */
140 virtual UnicodeString& toPattern(UnicodeString& result,
141 UBool escapeUnprintable = FALSE) const = 0;
142
143 /**
144 * Returns TRUE if this matcher will match a character c, where c
145 * & 0xFF == v, at offset, in the forward direction (with limit >
146 * offset). This is used by <tt>RuleBasedTransliterator</tt> for
147 * indexing.
148 * @stable ICU 2.4
149 */
150 virtual UBool matchesIndexValue(uint8_t v) const = 0;
151
152 /**
153 * Union the set of all characters that may be matched by this object
154 * into the given set.
155 * @param toUnionTo the set into which to union the source characters
156 * @stable ICU 2.4
157 */
158 virtual void addMatchSetTo(UnicodeSet& toUnionTo) const = 0;
159 };
160
161 U_NAMESPACE_END
162
163 #endif

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