mirror of
https://github.com/libretro/scummvm.git
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216 lines
7.6 KiB
C++
216 lines
7.6 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 modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (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, see <http://www.gnu.org/licenses/>.
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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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#include "common/base-str.h"
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namespace Common {
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/**
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* @defgroup common_ustr UTF-32 strings
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* @ingroup common
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*
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* @brief API for working with UTF-32 strings.
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*
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* @{
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*/
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class String;
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/**
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* A 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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* Note that operations like equals, deleteCharacter, toUppercase, etc.
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* are only 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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typedef char32_t u32char_type_t;
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class U32String : public BaseString<u32char_type_t> {
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public:
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typedef uint32 unsigned_type; /*!< Unsigned version of the underlying type. */
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public:
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/** Construct a new empty string. */
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U32String() : BaseString<u32char_type_t>() {}
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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) : BaseString<u32char_type_t>(str) {}
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/** Construct a new string containing exactly @p len characters read from address @p str. */
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U32String(const value_type *str, uint32 len) : BaseString<u32char_type_t>(str, len) {}
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explicit U32String(const uint32 *str) : BaseString<u32char_type_t>((const value_type *) str) {}
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U32String(const uint32 *str, uint32 len) : BaseString<u32char_type_t>((const value_type *) str, len) {}
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U32String(const uint32 *beginP, const uint32 *endP) : BaseString<u32char_type_t>((const value_type *) beginP, (const value_type *) endP) {}
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/** Construct a new string containing the characters between @p beginP (including) and @p endP (excluding). */
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U32String(const value_type *beginP, const value_type *endP) : BaseString<u32char_type_t>(beginP, endP) {}
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/** Construct a copy of the given string. */
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U32String(const U32String &str) : BaseString<u32char_type_t>(str) {}
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/** Construct a new string from the given null-terminated C string that uses the given @p page encoding. */
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explicit U32String(const char *str, CodePage page = kUtf8);
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/** Construct a new string containing exactly @p len characters read from address @p str. */
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U32String(const char *str, uint32 len, CodePage page = kUtf8);
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/** Construct a new string containing the characters between @p beginP (including) and @p endP (excluding). */
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U32String(const char *beginP, const char *endP, CodePage page = kUtf8);
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/** Construct a copy of the given string. */
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U32String(const String &str, CodePage page = kUtf8);
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/** Construct a string consisting of the given character. */
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explicit U32String(value_type c);
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/** Assign a given string to this string. */
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U32String &operator=(const U32String &str);
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/** @overload */
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U32String &operator=(const String &str);
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/** @overload */
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U32String &operator=(const value_type *str);
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/** @overload */
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U32String &operator=(const char *str);
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/** Append the given string to this string. */
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U32String &operator+=(const U32String &str);
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/** @overload */
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U32String &operator+=(value_type c);
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using BaseString<value_type>::operator==;
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using BaseString<value_type>::operator!=;
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/** Check whether this string is identical to string @p x. */
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bool operator==(const String &x) const;
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/** @overload */
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bool operator==(const char *x) const;
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/** Check whether this string is different than string @p x. */
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bool operator!=(const String &x) const;
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/** @overload */
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bool operator!=(const char *x) const;
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/** Convert the string to the given @p page encoding and return the result as a new String. */
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String encode(CodePage page = kUtf8) const;
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/**
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* Print formatted data into a U32String object.
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*
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* Similar to sprintf, except that it stores the result
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* in a (variably sized) string instead of a fixed-size buffer.
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*/
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static U32String format(U32String fmt, ...);
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/** @overload **/
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static U32String format(const char *fmt, ...);
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/**
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* Print formatted data into a U32String object.
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* The method takes in the output by reference and works with iterators.
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*/
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static int vformat(const value_type *fmt, const value_type *fmtEnd, U32String &output, va_list args);
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/**
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* Helper function for vformat. Convert an int to string.
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* Minimal implementation, only for base 10.
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*/
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static char* itoa(int num, char* str, int base);
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using BaseString<value_type>::insertString;
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void insertString(const char *s, uint32 p, CodePage page = kUtf8); /*!< Insert string @p s into this string at position @p p. */
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void insertString(const String &s, uint32 p, CodePage page = kUtf8); /*!< @overload */
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/** Return a substring of this string */
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U32String substr(size_t pos = 0, size_t len = npos) const;
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const uint32 *u32_str() const { /*!< Return the string as a UTF-32 pointer. */
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return (const uint32 *) _str;
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}
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/** Decode a big endian UTF-16 string into a U32String. */
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static Common::U32String decodeUTF16BE(const uint16 *start, uint len);
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/** Decode a little endian UTF-16 string into a U32String. */
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static Common::U32String decodeUTF16LE(const uint16 *start, uint len);
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/** Decode a native UTF-16 string into a U32String. */
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static Common::U32String decodeUTF16Native(const uint16 *start, uint len);
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/** Transform a U32String into UTF-16 representation (big endian). The result must be freed. */
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uint16 *encodeUTF16BE(uint *len = nullptr) const;
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/** Transform a U32String into UTF-16 representation (native endian). The result must be freed. */
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uint16 *encodeUTF16LE(uint *len = nullptr) const;
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/** Transform a U32String into UTF-16 representation (native encoding). The result must be freed. */
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uint16 *encodeUTF16Native(uint *len = nullptr) const;
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private:
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void decodeInternal(const char *str, uint32 len, CodePage page);
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void decodeOneByte(const char *str, uint32 len, CodePage page);
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void decodeWindows932(const char *src, uint32 len);
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void decodeWindows949(const char *src, uint32 len);
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void decodeWindows950(const char *src, uint32 len);
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void decodeUTF8(const char *str, uint32 len);
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friend class String;
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};
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/** Concatenate strings @p x and @p y. */
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U32String operator+(const U32String &x, const U32String &y);
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/** Append the given @p y character to the given @p x string. */
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U32String operator+(const U32String &x, U32String::value_type y);
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/**
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* Converts string with all non-printable characters properly escaped
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* with use of C++ escape sequences.
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* Unlike the String version, this does not escape characters with
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* codepoints > 127.
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*
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* @param src The source string.
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* @param keepNewLines Whether keep newlines or convert them to '\n', default: true.
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* @return The converted string.
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*/
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U32String toPrintable(const U32String &src, bool keepNewLines = true);
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/** @} */
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} // End of namespace Common
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#endif
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