File: usetiter.cpp

package info (click to toggle)
icu 63.2-2
  • links: PTS
  • area: main
  • in suites: bullseye, sid
  • size: 102,128 kB
  • sloc: cpp: 452,584; ansic: 109,494; makefile: 5,350; sh: 4,106; xml: 3,861; perl: 3,195; python: 376; sed: 36; lisp: 12
file content (152 lines) | stat: -rw-r--r-- 4,575 bytes parent folder | download | duplicates (17)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
**********************************************************************
* Copyright (c) 2002-2006, International Business Machines
* Corporation and others.  All Rights Reserved.
**********************************************************************
*/
#include "unicode/usetiter.h"
#include "unicode/uniset.h"
#include "unicode/unistr.h"
#include "uvector.h"

U_NAMESPACE_BEGIN

UOBJECT_DEFINE_RTTI_IMPLEMENTATION(UnicodeSetIterator)

/**
 * Create an iterator
 * @param set set to iterate over
 */
UnicodeSetIterator::UnicodeSetIterator(const UnicodeSet& uSet) {
    cpString  = NULL;
    reset(uSet);
}

/**
 * Create an iterator. Convenience for when the contents are to be set later.
 */
UnicodeSetIterator::UnicodeSetIterator() {
    this->set = NULL;
    cpString  = NULL;
    reset();
}

UnicodeSetIterator::~UnicodeSetIterator() {
    delete cpString;
}

/**
 * Returns the next element in the set.
 * @return true if there was another element in the set.
 * if so, if codepoint == IS_STRING, the value is a string in the string field
 * else the value is a single code point in the codepoint field.
 * <br>You are guaranteed that the codepoints are in sorted order, and the strings are in sorted order,
 * and that all code points are returned before any strings are returned.
 * <br>Note also that the codepointEnd is undefined after calling this method.
 */
UBool UnicodeSetIterator::next() {
    if (nextElement <= endElement) {
        codepoint = codepointEnd = nextElement++;
        string = NULL;
        return TRUE;
    }
    if (range < endRange) {
        loadRange(++range);
        codepoint = codepointEnd = nextElement++;
        string = NULL;
        return TRUE;
    }

    if (nextString >= stringCount) return FALSE;
    codepoint = (UChar32)IS_STRING; // signal that value is actually a string
    string = (const UnicodeString*) set->strings->elementAt(nextString++);
    return TRUE;
}

/**
 * @return true if there was another element in the set.
 * if so, if codepoint == IS_STRING, the value is a string in the string field
 * else the value is a range of codepoints in the <codepoint, codepointEnd> fields.
 * <br>Note that the codepoints are in sorted order, and the strings are in sorted order,
 * and that all code points are returned before any strings are returned.
 * <br>You are guaranteed that the ranges are in sorted order, and the strings are in sorted order,
 * and that all ranges are returned before any strings are returned.
 * <br>You are also guaranteed that ranges are disjoint and non-contiguous.
 * <br>Note also that the codepointEnd is undefined after calling this method.
 */
UBool UnicodeSetIterator::nextRange() {
    string = NULL;
    if (nextElement <= endElement) {
        codepointEnd = endElement;
        codepoint = nextElement;
        nextElement = endElement+1;
        return TRUE;
    }
    if (range < endRange) {
        loadRange(++range);
        codepointEnd = endElement;
        codepoint = nextElement;
        nextElement = endElement+1;
        return TRUE;
    }

    if (nextString >= stringCount) return FALSE;
    codepoint = (UChar32)IS_STRING; // signal that value is actually a string
    string = (const UnicodeString*) set->strings->elementAt(nextString++);
    return TRUE;
}

/**
 *@param set the set to iterate over. This allows reuse of the iterator.
 */
void UnicodeSetIterator::reset(const UnicodeSet& uSet) {
    this->set = &uSet;
    reset();
}

/**
 * Resets to the start, to allow the iteration to start over again.
 */
void UnicodeSetIterator::reset() {
    if (set == NULL) {
        // Set up indices to empty iteration
        endRange = -1;
        stringCount = 0;
    } else {
        endRange = set->getRangeCount() - 1;
        stringCount = set->strings->size();
    }
    range = 0;
    endElement = -1;
    nextElement = 0;            
    if (endRange >= 0) {
        loadRange(range);
    }
    nextString = 0;
    string = NULL;
}

void UnicodeSetIterator::loadRange(int32_t iRange) {
    nextElement = set->getRangeStart(iRange);
    endElement = set->getRangeEnd(iRange);
}


const UnicodeString& UnicodeSetIterator::getString()  {
    if (string==NULL && codepoint!=(UChar32)IS_STRING) {
       if (cpString == NULL) {
          cpString = new UnicodeString();
       }
       if (cpString != NULL) {
          cpString->setTo((UChar32)codepoint);
       }
       string = cpString;
    }
    return *string;
}

U_NAMESPACE_END

//eof