mirror of
https://github.com/libretro/scummvm.git
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243 lines
6.9 KiB
C++
243 lines
6.9 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#ifndef COMMON_USTR_H
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#define COMMON_USTR_H
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#include "common/scummsys.h"
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#include "common/str-enc.h"
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namespace Common {
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class String;
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/**
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* Very simple string class for UTF-32 strings in ScummVM. The main intention
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* behind this class is to feature a simple way of displaying UTF-32 strings
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* through the Graphics::Font API.
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*
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* Please note that operations like equals, deleteCharacter, toUppercase, etc.
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* are only very simplified convenience operations. They might not fully work
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* as you would expect for a proper UTF-32 string class.
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*
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* The presence of \0 characters in the string will cause undefined
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* behavior in some operations.
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*/
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class U32String {
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public:
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static const uint32 npos = 0xFFFFFFFF;
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typedef uint32 value_type;
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typedef uint32 unsigned_type;
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private:
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/**
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* The size of the internal storage. Increasing this means less heap
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* allocations are needed, at the cost of more stack memory usage,
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* and of course lots of wasted memory.
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*/
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static const uint32 _builtinCapacity = 32;
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/**
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* Length of the string.
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*/
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uint32 _size;
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/**
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* Pointer to the actual string storage. Either points to _storage,
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* or to a block allocated on the heap via malloc.
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*/
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value_type *_str;
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union {
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/**
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* Internal string storage.
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*/
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value_type _storage[_builtinCapacity];
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/**
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* External string storage data -- the refcounter, and the
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* capacity of the string _str points to.
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*/
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struct {
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mutable int *_refCount;
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uint32 _capacity;
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} _extern;
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};
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inline bool isStorageIntern() const {
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return _str == _storage;
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}
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public:
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/** Construct a new empty string. */
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U32String() : _size(0), _str(_storage) { _storage[0] = 0; }
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/** Construct a new string from the given NULL-terminated C string. */
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explicit U32String(const value_type *str);
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/** Construct a new string containing exactly len characters read from address str. */
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U32String(const value_type *str, uint32 len);
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/** Construct a new string containing the characters between beginP (including) and endP (excluding). */
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U32String(const value_type *beginP, const value_type *endP);
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/** Construct a copy of the given string. */
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U32String(const U32String &str);
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/** Construct a new string from the given NULL-terminated C string. */
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explicit U32String(const char *str);
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/** Construct a new string containing exactly len characters read from address str. */
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U32String(const char *str, uint32 len);
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/** Construct a new string containing the characters between beginP (including) and endP (excluding). */
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U32String(const char *beginP, const char *endP);
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/** Construct a copy of the given string. */
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U32String(const String &str);
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~U32String();
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U32String &operator=(const U32String &str);
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U32String &operator=(const String &str);
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U32String &operator=(const value_type *str);
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U32String &operator=(const char *str);
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U32String &operator+=(const U32String &str);
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U32String &operator+=(value_type c);
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bool operator==(const U32String &x) const;
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bool operator==(const String &x) const;
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bool operator==(const value_type *x) const;
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bool operator==(const char *x) const;
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bool operator!=(const U32String &x) const;
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bool operator!=(const String &x) const;
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bool operator!=(const value_type *x) const;
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bool operator!=(const char *x) const;
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/**
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* Compares whether two U32String are the same based on memory comparison.
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* This does *not* do comparison based on canonical equivalence.
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*/
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bool equals(const U32String &x) const;
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/**
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* Compares whether two U32String are the same based on memory comparison.
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* This does *not* do comparison based on canonical equivalence.
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*/
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bool equals(const String &x) const;
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bool contains(value_type x) const;
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inline const value_type *c_str() const { return _str; }
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inline uint32 size() const { return _size; }
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inline bool empty() const { return (_size == 0); }
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value_type operator[](int idx) const {
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assert(_str && idx >= 0 && idx < (int)_size);
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return _str[idx];
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}
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/** Set character c at position p, replacing the previous character there. */
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void setChar(value_type c, uint32 p) {
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_str[p] = c;
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}
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/**
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* Removes the value at position p from the string.
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* Using this on decomposed characters will not remove the whole
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* character!
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*/
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void deleteChar(uint32 p);
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/** Remove the last character from the string. */
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void deleteLastChar();
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/** Remove all characters from position p to the p + len. If len = String::npos, removes all characters to the end */
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void erase(uint32 p, uint32 len = npos);
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/** Clears the string, making it empty. */
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void clear();
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/**
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* Convert all characters in the string to lowercase.
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*
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* Be aware that this only affects the case of ASCII characters. All
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* other characters will not be touched at all.
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*/
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void toLowercase();
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/**
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* Convert all characters in the string to uppercase.
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*
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* Be aware that this only affects the case of ASCII characters. All
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* other characters will not be touched at all.
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*/
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void toUppercase();
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uint32 find(value_type x, uint32 pos = 0) const;
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uint32 find(const U32String &str, uint32 pos = 0) const;
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typedef value_type * iterator;
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typedef const value_type * const_iterator;
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iterator begin() {
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// Since the user could potentially
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// change the string via the returned
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// iterator we have to assure we are
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// pointing to a unique storage.
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makeUnique();
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return _str;
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}
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iterator end() {
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return begin() + size();
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}
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const_iterator begin() const {
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return _str;
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}
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const_iterator end() const {
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return begin() + size();
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}
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/** Python-like method **/
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String encode(CodePage page = kUtf8) const;
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private:
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void makeUnique();
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void ensureCapacity(uint32 new_size, bool keep_old);
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void incRefCount() const;
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void decRefCount(int *oldRefCount);
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void initWithCStr(const value_type *str, uint32 len);
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void initWithCStr(const char *str, uint32 len);
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void encodeUTF8(String &dst) const;
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void encodeOneByte(String &dst, CodePage page) const;
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};
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U32String operator+(const U32String &x, const U32String &y);
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} // End of namespace Common
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#endif
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