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| -rw-r--r-- | include/rtl/character.hxx | 526 |
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diff --git a/include/rtl/character.hxx b/include/rtl/character.hxx new file mode 100644 index 000000000..580106353 --- /dev/null +++ b/include/rtl/character.hxx @@ -0,0 +1,526 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/* + * This file is part of the LibreOffice project. + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. + * + * This file incorporates work covered by the following license notice: + * + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed + * with this work for additional information regarding copyright + * ownership. The ASF licenses this file to you under the Apache + * License, Version 2.0 (the "License"); you may not use this file + * except in compliance with the License. You may obtain a copy of + * the License at http://www.apache.org/licenses/LICENSE-2.0 . + */ + +/* + * This file is part of LibreOffice published API. + */ + +#ifndef INCLUDED_RTL_CHARACTER_HXX +#define INCLUDED_RTL_CHARACTER_HXX + +#include "sal/config.h" + +#include <cassert> +#include <cstddef> + +#include "sal/types.h" + +#if defined LIBO_INTERNAL_ONLY +#include <type_traits> +#endif + +namespace rtl +{ +/** Check for Unicode code point. + + @param code An integer. + + @return True if code is a Unicode code point. + + @since LibreOffice 5.2 +*/ +inline SAL_CONSTEXPR bool isUnicodeCodePoint(sal_uInt32 code) { return code <= 0x10FFFF; } + +/** Check for ASCII character. + + @param code A Unicode code point. + + @return True if code is an ASCII character (0x00--0x7F). + + @since LibreOffice 4.1 + */ +inline SAL_CONSTEXPR bool isAscii(sal_uInt32 code) +{ + assert(isUnicodeCodePoint(code)); + return code <= 0x7F; +} + +#if defined LIBO_INTERNAL_ONLY +bool isAscii(char) = delete; +bool isAscii(signed char) = delete; +template <typename T> +inline constexpr std::enable_if_t<std::is_integral_v<T> && sizeof(T) <= sizeof(sal_uInt32), bool> +isAscii(T code) +{ + return isAscii(sal_uInt32(code)); +} +#endif + +/** Check for ASCII lower case character. + + @param code A Unicode code point. + + @return True if code is an ASCII lower case alphabetic character (ASCII + 'a'--'z'). + + @since LibreOffice 4.1 + */ +inline SAL_CONSTEXPR bool isAsciiLowerCase(sal_uInt32 code) +{ + assert(isUnicodeCodePoint(code)); + return code >= 'a' && code <= 'z'; +} + +#if defined LIBO_INTERNAL_ONLY +bool isAsciiLowerCase(char) = delete; +bool isAsciiLowerCase(signed char) = delete; +template <typename T> +inline constexpr std::enable_if_t<std::is_integral_v<T> && sizeof(T) <= sizeof(sal_uInt32), bool> +isAsciiLowerCase(T code) +{ + return isAsciiLowerCase(sal_uInt32(code)); +} +#endif + +/** Check for ASCII upper case character. + + @param code A Unicode code point. + + @return True if code is an ASCII upper case alphabetic character (ASCII + 'A'--'Z'). + + @since LibreOffice 4.1 + */ +inline SAL_CONSTEXPR bool isAsciiUpperCase(sal_uInt32 code) +{ + assert(isUnicodeCodePoint(code)); + return code >= 'A' && code <= 'Z'; +} + +#if defined LIBO_INTERNAL_ONLY +bool isAsciiUpperCase(char) = delete; +bool isAsciiUpperCase(signed char) = delete; +template <typename T> +inline constexpr std::enable_if_t<std::is_integral_v<T> && sizeof(T) <= sizeof(sal_uInt32), bool> +isAsciiUpperCase(T code) +{ + return isAsciiUpperCase(sal_uInt32(code)); +} +#endif + +/** Check for ASCII alphabetic character. + + @param code A Unicode code point. + + @return True if code is an ASCII alphabetic character (ASCII 'A'--'Z' or + 'a'--'z'). + + @since LibreOffice 4.1 + */ +inline SAL_CONSTEXPR bool isAsciiAlpha(sal_uInt32 code) +{ + assert(isUnicodeCodePoint(code)); + return isAsciiLowerCase(code) || isAsciiUpperCase(code); +} + +#if defined LIBO_INTERNAL_ONLY +bool isAsciiAlpha(char) = delete; +bool isAsciiAlpha(signed char) = delete; +template <typename T> +inline constexpr std::enable_if_t<std::is_integral_v<T> && sizeof(T) <= sizeof(sal_uInt32), bool> +isAsciiAlpha(T code) +{ + return isAsciiAlpha(sal_uInt32(code)); +} +#endif + +/** Check for ASCII digit character. + + @param code A Unicode code point. + + @return True if code is an ASCII (decimal) digit character (ASCII + '0'--'9'). + + @since LibreOffice 4.1 + */ +inline SAL_CONSTEXPR bool isAsciiDigit(sal_uInt32 code) +{ + assert(isUnicodeCodePoint(code)); + return code >= '0' && code <= '9'; +} + +#if defined LIBO_INTERNAL_ONLY +bool isAsciiDigit(char) = delete; +bool isAsciiDigit(signed char) = delete; +template <typename T> +inline constexpr std::enable_if_t<std::is_integral_v<T> && sizeof(T) <= sizeof(sal_uInt32), bool> +isAsciiDigit(T code) +{ + return isAsciiDigit(sal_uInt32(code)); +} +#endif + +/** Check for ASCII alphanumeric character. + + @param code A Unicode code point. + + @return True if code is an ASCII alphanumeric character (ASCII '0'--'9', + 'A'--'Z', or 'a'--'z'). + + @since LibreOffice 4.1 + */ +inline SAL_CONSTEXPR bool isAsciiAlphanumeric(sal_uInt32 code) +{ + assert(isUnicodeCodePoint(code)); + return isAsciiDigit(code) || isAsciiAlpha(code); +} + +#if defined LIBO_INTERNAL_ONLY +bool isAsciiAlphanumeric(char) = delete; +bool isAsciiAlphanumeric(signed char) = delete; +template <typename T> +inline constexpr std::enable_if_t<std::is_integral_v<T> && sizeof(T) <= sizeof(sal_uInt32), bool> +isAsciiAlphanumeric(T code) +{ + return isAsciiAlphanumeric(sal_uInt32(code)); +} +#endif + +/** Check for ASCII canonic hexadecimal digit character. + + @param code A Unicode code point. + + @return True if code is an ASCII canonic (i.e., upper case) hexadecimal + digit character (ASCII '0'--'9' or 'A'--'F'). + + @since LibreOffice 4.1 + */ +inline SAL_CONSTEXPR bool isAsciiCanonicHexDigit(sal_uInt32 code) +{ + assert(isUnicodeCodePoint(code)); + return isAsciiDigit(code) || (code >= 'A' && code <= 'F'); +} + +#if defined LIBO_INTERNAL_ONLY +bool isAsciiCanonicHexDigit(char) = delete; +bool isAsciiCanonicHexDigit(signed char) = delete; +template <typename T> +inline constexpr std::enable_if_t<std::is_integral_v<T> && sizeof(T) <= sizeof(sal_uInt32), bool> +isAsciiCanonicHexDigit(T code) +{ + return isAsciiCanonicHexDigit(sal_uInt32(code)); +} +#endif + +/** Check for ASCII hexadecimal digit character. + + @param code A Unicode code point. + + @return True if code is an ASCII hexadecimal digit character (ASCII + '0'--'9', 'A'--'F', or 'a'--'f'). + + @since LibreOffice 4.1 + */ +inline SAL_CONSTEXPR bool isAsciiHexDigit(sal_uInt32 code) +{ + assert(isUnicodeCodePoint(code)); + return isAsciiCanonicHexDigit(code) || (code >= 'a' && code <= 'f'); +} + +#if defined LIBO_INTERNAL_ONLY +bool isAsciiHexDigit(char) = delete; +bool isAsciiHexDigit(signed char) = delete; +template <typename T> +inline constexpr std::enable_if_t<std::is_integral_v<T> && sizeof(T) <= sizeof(sal_uInt32), bool> +isAsciiHexDigit(T code) +{ + return isAsciiHexDigit(sal_uInt32(code)); +} +#endif + +/** Check for ASCII octal digit character. + + @param code A Unicode code point. + + @return True if code is an ASCII octal digit character (ASCII '0'--'7'). + + @since LibreOffice 5.0 + */ +inline SAL_CONSTEXPR bool isAsciiOctalDigit(sal_uInt32 code) +{ + assert(isUnicodeCodePoint(code)); + return code >= '0' && code <= '7'; +} + +#if defined LIBO_INTERNAL_ONLY +bool isAsciiOctalDigit(char) = delete; +bool isAsciiOctalDigit(signed char) = delete; +template <typename T> +inline constexpr std::enable_if_t<std::is_integral_v<T> && sizeof(T) <= sizeof(sal_uInt32), bool> +isAsciiOctalDigit(T code) +{ + return isAsciiOctalDigit(sal_uInt32(code)); +} +#endif + +/** Check for ASCII white space character. + + @param code A Unicode code point. + + @return True if code is an ASCII white space character as defined by C for + isspace in the "C" locale (ASCII ' ', '\\f', '\\n', '\\r', '\\t' '\\v'). + + @since LibreOffice 5.4 +*/ +inline SAL_CONSTEXPR bool isAsciiWhiteSpace(sal_uInt32 code) +{ + assert(isUnicodeCodePoint(code)); + return code == ' ' || code == '\f' || code == '\n' || code == '\r' || code == '\t' + || code == '\v'; +} + +#if defined LIBO_INTERNAL_ONLY +bool isAsciiWhiteSpace(char) = delete; +bool isAsciiWhiteSpace(signed char) = delete; +template <typename T> +inline constexpr std::enable_if_t<std::is_integral_v<T> && sizeof(T) <= sizeof(sal_uInt32), bool> +isAsciiWhiteSpace(T code) +{ + return isAsciiWhiteSpace(sal_uInt32(code)); +} +#endif + +/** Convert a character, if ASCII, to upper case. + + @param code A Unicode code point. + + @return code converted to ASCII upper case. + + @since LibreOffice 4.2 +*/ +inline SAL_CONSTEXPR sal_uInt32 toAsciiUpperCase(sal_uInt32 code) +{ + assert(isUnicodeCodePoint(code)); + return isAsciiLowerCase(code) ? code - 32 : code; +} + +#if defined LIBO_INTERNAL_ONLY +sal_uInt32 toAsciiUpperCase(char) = delete; +sal_uInt32 toAsciiUpperCase(signed char) = delete; +template <typename T> +inline constexpr std::enable_if_t<std::is_integral_v<T> && sizeof(T) <= sizeof(sal_uInt32), + sal_uInt32> +toAsciiUpperCase(T code) +{ + return toAsciiUpperCase(sal_uInt32(code)); +} +#endif + +/** Convert a character, if ASCII, to lower case. + + @param code A Unicode code point. + + @return code converted to ASCII lower case. + + @since LibreOffice 4.2 +*/ +inline SAL_CONSTEXPR sal_uInt32 toAsciiLowerCase(sal_uInt32 code) +{ + assert(isUnicodeCodePoint(code)); + return isAsciiUpperCase(code) ? code + 32 : code; +} + +#if defined LIBO_INTERNAL_ONLY +sal_uInt32 toAsciiLowerCase(char) = delete; +sal_uInt32 toAsciiLowerCase(signed char) = delete; +template <typename T> +inline constexpr std::enable_if_t<std::is_integral_v<T> && sizeof(T) <= sizeof(sal_uInt32), + sal_uInt32> +toAsciiLowerCase(T code) +{ + return toAsciiLowerCase(sal_uInt32(code)); +} +#endif + +/** Compare two characters ignoring ASCII case. + + @param code1 A Unicode code point. + + @param code2 A unicode code point. + + @return 0 if both code points are equal, + < 0 if code1 is less than code2, + > 0 if code1 is greater than code2. + + @since LibreOffice 4.2 + */ +inline SAL_CONSTEXPR sal_Int32 compareIgnoreAsciiCase(sal_uInt32 code1, sal_uInt32 code2) +{ + assert(isUnicodeCodePoint(code1)); + assert(isUnicodeCodePoint(code2)); + return static_cast<sal_Int32>(toAsciiLowerCase(code1)) + - static_cast<sal_Int32>(toAsciiLowerCase(code2)); +} + +/// @cond INTERNAL +namespace detail +{ +sal_uInt32 const surrogatesHighFirst = 0xD800; +sal_uInt32 const surrogatesHighLast = 0xDBFF; +sal_uInt32 const surrogatesLowFirst = 0xDC00; +sal_uInt32 const surrogatesLowLast = 0xDFFF; +} +/// @endcond + +/** Check for surrogate. + + @param code A Unicode code point. + + @return True if code is a surrogate code point (0xD800--0xDFFF). + + @since LibreOffice 6.0 +*/ +inline SAL_CONSTEXPR bool isSurrogate(sal_uInt32 code) +{ + assert(isUnicodeCodePoint(code)); + return code >= detail::surrogatesHighFirst && code <= detail::surrogatesLowLast; +} + +/** Check for high surrogate. + + @param code A Unicode code point. + + @return True if code is a high surrogate code point (0xD800--0xDBFF). + + @since LibreOffice 5.0 +*/ +inline SAL_CONSTEXPR bool isHighSurrogate(sal_uInt32 code) +{ + assert(isUnicodeCodePoint(code)); + return code >= detail::surrogatesHighFirst && code <= detail::surrogatesHighLast; +} + +/** Check for low surrogate. + + @param code A Unicode code point. + + @return True if code is a low surrogate code point (0xDC00--0xDFFF). + + @since LibreOffice 5.0 +*/ +inline SAL_CONSTEXPR bool isLowSurrogate(sal_uInt32 code) +{ + assert(isUnicodeCodePoint(code)); + return code >= detail::surrogatesLowFirst && code <= detail::surrogatesLowLast; +} + +/** Get high surrogate half of a non-BMP Unicode code point. + + @param code A non-BMP Unicode code point. + + @return The UTF-16 high surrogate half for the give code point. + + @since LibreOffice 5.0 + */ +inline SAL_CONSTEXPR sal_Unicode getHighSurrogate(sal_uInt32 code) +{ + assert(isUnicodeCodePoint(code)); + assert(code >= 0x10000); + return static_cast<sal_Unicode>(((code - 0x10000) >> 10) | detail::surrogatesHighFirst); +} + +/** Get low surrogate half of a non-BMP Unicode code point. + + @param code A non-BMP Unicode code point. + + @return The UTF-16 low surrogate half for the give code point. + + @since LibreOffice 5.0 + */ +inline SAL_CONSTEXPR sal_Unicode getLowSurrogate(sal_uInt32 code) +{ + assert(isUnicodeCodePoint(code)); + assert(code >= 0x10000); + return static_cast<sal_Unicode>(((code - 0x10000) & 0x3FF) | detail::surrogatesLowFirst); +} + +/** Combine surrogates to form a code point. + + @param high A high surrogate code point. + + @param low A low surrogate code point. + + @return The code point represented by the surrogate pair. + + @since LibreOffice 5.0 +*/ +inline SAL_CONSTEXPR sal_uInt32 combineSurrogates(sal_uInt32 high, sal_uInt32 low) +{ + assert(isHighSurrogate(high)); + assert(isLowSurrogate(low)); + return ((high - detail::surrogatesHighFirst) << 10) + (low - detail::surrogatesLowFirst) + + 0x10000; +} + +/** Split a Unicode code point into UTF-16 code units. + + @param code A Unicode code point. + + @param output A non-null pointer to an array with space for at least two + sal_Unicode UTF-16 code units. + + @return The number of UTF-16 code units placed into the output (either one + or two). + + @since LibreOffice 5.3 +*/ +inline SAL_CONSTEXPR std::size_t splitSurrogates(sal_uInt32 code, sal_Unicode* output) +{ + assert(isUnicodeCodePoint(code)); + assert(output != NULL); + if (code < 0x10000) + { + output[0] = code; + return 1; + } + else + { + output[0] = getHighSurrogate(code); + output[1] = getLowSurrogate(code); + return 2; + } +} + +/** Check for Unicode scalar value. + + @param code An integer. + + @return True if code is a Unicode scalar value. + + @since LibreOffice 6.0 +*/ +inline SAL_CONSTEXPR bool isUnicodeScalarValue(sal_uInt32 code) +{ + return isUnicodeCodePoint(code) && !isSurrogate(code); +} +} + +#endif + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |