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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#ifndef COMMON_USTR_H
#define COMMON_USTR_H
#include "common/scummsys.h"
namespace Common {
/**
* Very simple string class for UTF-32 strings in ScummVM. The main intention
* behind this class is to feature a simple way of displaying UTF-32 strings
* through the Graphics::Font API.
*
* Please note that operations like equals, deleteCharacter, toUppercase, etc.
* are only very simplified convenience operations. They might not fully work
* as you would expect for a proper UTF-32 string class.
*
* The presence of \0 characters in the string will cause undefined
* behavior in some operations.
*/
class U32String {
public:
static const uint32 npos = 0xFFFFFFFF;
typedef uint32 value_type;
typedef uint32 unsigned_type;
private:
/**
* The size of the internal storage. Increasing this means less heap
* allocations are needed, at the cost of more stack memory usage,
* and of course lots of wasted memory.
*/
static const uint32 _builtinCapacity = 32;
/**
* Length of the string.
*/
uint32 _size;
/**
* Pointer to the actual string storage. Either points to _storage,
* or to a block allocated on the heap via malloc.
*/
value_type *_str;
union {
/**
* Internal string storage.
*/
value_type _storage[_builtinCapacity];
/**
* External string storage data -- the refcounter, and the
* capacity of the string _str points to.
*/
struct {
mutable int *_refCount;
uint32 _capacity;
} _extern;
};
inline bool isStorageIntern() const {
return _str == _storage;
}
public:
/** Construct a new empty string. */
U32String() : _size(0), _str(_storage) { _storage[0] = 0; }
/** Construct a new string from the given NULL-terminated C string. */
explicit U32String(const value_type *str);
/** Construct a new string containing exactly len characters read from address str. */
U32String(const value_type *str, uint32 len);
/** Construct a new string containing the characters between beginP (including) and endP (excluding). */
U32String(const value_type *beginP, const value_type *endP);
/** Construct a copy of the given string. */
U32String(const U32String &str);
~U32String();
U32String &operator=(const U32String &str);
U32String &operator+=(const U32String &str);
U32String &operator+=(value_type c);
/**
* Equivalence comparison operator.
* @see equals
*/
bool operator==(const U32String &x) const { return equals(x); }
/**
* Compares whether two U32String are the same based on memory comparison.
* This does *not* do comparison based on canonical equivalence.
*/
bool equals(const U32String &x) const;
bool contains(value_type x) const;
inline const value_type *c_str() const { return _str; }
inline uint32 size() const { return _size; }
inline bool empty() const { return (_size == 0); }
value_type operator[](int idx) const {
assert(_str && idx >= 0 && idx < (int)_size);
return _str[idx];
}
/**
* Removes the value at position p from the string.
* Using this on decomposed characters will not remove the whole
* character!
*/
void deleteChar(uint32 p);
/** Clears the string, making it empty. */
void clear();
/**
* Convert all characters in the string to lowercase.
*
* Be aware that this only affects the case of ASCII characters. All
* other characters will not be touched at all.
*/
void toLowercase();
/**
* Convert all characters in the string to uppercase.
*
* Be aware that this only affects the case of ASCII characters. All
* other characters will not be touched at all.
*/
void toUppercase();
uint32 find(const U32String &str, uint32 pos = 0) const;
typedef value_type * iterator;
typedef const value_type * const_iterator;
iterator begin() {
// Since the user could potentially
// change the string via the returned
// iterator we have to assure we are
// pointing to a unique storage.
makeUnique();
return _str;
}
iterator end() {
return begin() + size();
}
const_iterator begin() const {
return _str;
}
const_iterator end() const {
return begin() + size();
}
private:
void makeUnique();
void ensureCapacity(uint32 new_size, bool keep_old);
void incRefCount() const;
void decRefCount(int *oldRefCount);
void initWithCStr(const value_type *str, uint32 len);
};
} // End of namespace Common
#endif
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