aboutsummaryrefslogtreecommitdiffstats
path: root/contrib/libs/icu/common/charstr.h
blob: 7749a804b931a9c8dc0063396cf25cbead384823 (plain) (blame)
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
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
**********************************************************************
*   Copyright (c) 2001-2015, International Business Machines
*   Corporation and others.  All Rights Reserved.
**********************************************************************
*   Date        Name        Description
*   11/19/2001  aliu        Creation.
*   05/19/2010  markus      Rewritten from scratch
**********************************************************************
*/

#ifndef CHARSTRING_H
#define CHARSTRING_H

#include "unicode/utypes.h"
#include "unicode/unistr.h"
#include "unicode/uobject.h"
#include "cmemory.h"

U_NAMESPACE_BEGIN

// Windows needs us to DLL-export the MaybeStackArray template specialization,
// but MacOS X cannot handle it. Same as in digitlst.h.
#if !U_PLATFORM_IS_DARWIN_BASED
template class U_COMMON_API MaybeStackArray<char, 40>;
#endif

/**
 * ICU-internal char * string class.
 * This class does not assume or enforce any particular character encoding.
 * Raw bytes can be stored. The string object owns its characters.
 * A terminating NUL is stored, but the class does not prevent embedded NUL characters.
 *
 * This class wants to be convenient but is also deliberately minimalist.
 * Please do not add methods if they only add minor convenience.
 * For example:
 *   cs.data()[5]='a';  // no need for setCharAt(5, 'a')
 */
class U_COMMON_API CharString : public UMemory {
public:
    CharString() : len(0) { buffer[0]=0; }
    CharString(StringPiece s, UErrorCode &errorCode) : len(0) {
        buffer[0]=0;
        append(s, errorCode);
    }
    CharString(const CharString &s, UErrorCode &errorCode) : len(0) {
        buffer[0]=0;
        append(s, errorCode);
    }
    CharString(const char *s, int32_t sLength, UErrorCode &errorCode) : len(0) {
        buffer[0]=0;
        append(s, sLength, errorCode);
    }
    ~CharString() {}

    /**
     * Move constructor; might leave src in an undefined state.
     * This string will have the same contents and state that the source string had.
     */
    CharString(CharString &&src) noexcept;
    /**
     * Move assignment operator; might leave src in an undefined state.
     * This string will have the same contents and state that the source string had.
     * The behavior is undefined if *this and src are the same object.
     */
    CharString &operator=(CharString &&src) noexcept;

    /**
     * Replaces this string's contents with the other string's contents.
     * CharString does not support the standard copy constructor nor
     * the assignment operator, to make copies explicit and to
     * use a UErrorCode where memory allocations might be needed.
     */
    CharString &copyFrom(const CharString &other, UErrorCode &errorCode);

    UBool isEmpty() const { return len==0; }
    int32_t length() const { return len; }
    char operator[](int32_t index) const { return buffer[index]; }
    StringPiece toStringPiece() const { return StringPiece(buffer.getAlias(), len); }

    const char *data() const { return buffer.getAlias(); }
    char *data() { return buffer.getAlias(); }
    /**
     * Allocates length()+1 chars and copies the NUL-terminated data().
     * The caller must uprv_free() the result.
     */
    char *cloneData(UErrorCode &errorCode) const;
    /**
     * Copies the contents of the string into dest.
     * Checks if there is enough space in dest, extracts the entire string if possible,
     * and NUL-terminates dest if possible.
     *
     * If the string fits into dest but cannot be NUL-terminated (length()==capacity),
     * then the error code is set to U_STRING_NOT_TERMINATED_WARNING.
     * If the string itself does not fit into dest (length()>capacity),
     * then the error code is set to U_BUFFER_OVERFLOW_ERROR.
     *
     * @param dest Destination string buffer.
     * @param capacity Size of the dest buffer (number of chars).
     * @param errorCode ICU error code.
     * @return length()
     */
    int32_t extract(char *dest, int32_t capacity, UErrorCode &errorCode) const;

    bool operator==(StringPiece other) const {
        return len == other.length() && (len == 0 || uprv_memcmp(data(), other.data(), len) == 0);
    }
    bool operator!=(StringPiece other) const {
        return !operator==(other);
    }

    /** @return last index of c, or -1 if c is not in this string */
    int32_t lastIndexOf(char c) const;

    bool contains(StringPiece s) const;

    CharString &clear() { len=0; buffer[0]=0; return *this; }
    CharString &truncate(int32_t newLength);

    CharString &append(char c, UErrorCode &errorCode);
    CharString &append(StringPiece s, UErrorCode &errorCode) {
        return append(s.data(), s.length(), errorCode);
    }
    CharString &append(const CharString &s, UErrorCode &errorCode) {
        return append(s.data(), s.length(), errorCode);
    }
    CharString &append(const char *s, int32_t sLength, UErrorCode &status);

    CharString &appendNumber(int32_t number, UErrorCode &status);

    /**
     * Returns a writable buffer for appending and writes the buffer's capacity to
     * resultCapacity. Guarantees resultCapacity>=minCapacity if U_SUCCESS().
     * There will additionally be space for a terminating NUL right at resultCapacity.
     * (This function is similar to ByteSink.GetAppendBuffer().)
     *
     * The returned buffer is only valid until the next write operation
     * on this string.
     *
     * After writing at most resultCapacity bytes, call append() with the
     * pointer returned from this function and the number of bytes written.
     *
     * @param minCapacity required minimum capacity of the returned buffer;
     *                    must be non-negative
     * @param desiredCapacityHint desired capacity of the returned buffer;
     *                            must be non-negative
     * @param resultCapacity will be set to the capacity of the returned buffer
     * @param errorCode in/out error code
     * @return a buffer with resultCapacity>=min_capacity
     */
    char *getAppendBuffer(int32_t minCapacity,
                          int32_t desiredCapacityHint,
                          int32_t &resultCapacity,
                          UErrorCode &errorCode);

    CharString &appendInvariantChars(const UnicodeString &s, UErrorCode &errorCode);
    CharString &appendInvariantChars(const char16_t* uchars, int32_t ucharsLen, UErrorCode& errorCode);

    /**
     * Appends a filename/path part, e.g., a directory name.
     * First appends a U_FILE_SEP_CHAR or U_FILE_ALT_SEP_CHAR if necessary.
     * Does nothing if s is empty.
     */
    CharString &appendPathPart(StringPiece s, UErrorCode &errorCode);

    /**
     * Appends a U_FILE_SEP_CHAR or U_FILE_ALT_SEP_CHAR if this string is not empty
     * and does not already end with a U_FILE_SEP_CHAR or U_FILE_ALT_SEP_CHAR.
     */
    CharString &ensureEndsWithFileSeparator(UErrorCode &errorCode);

private:
    MaybeStackArray<char, 40> buffer;
    int32_t len;

    UBool ensureCapacity(int32_t capacity, int32_t desiredCapacityHint, UErrorCode &errorCode);

    CharString(const CharString &other) = delete; // forbid copying of this class
    CharString &operator=(const CharString &other) = delete; // forbid copying of this class

    /**
     * Returns U_FILE_ALT_SEP_CHAR if found in string, and U_FILE_SEP_CHAR is not found.
     * Otherwise returns U_FILE_SEP_CHAR.
     */
    char getDirSepChar() const;
};

U_NAMESPACE_END

#endif
//eof