Emilio Cobos Álvarez
2223a8bee2
Automatically generated with:
cp dom/.clang-format xpcom/ && mach format xpcom/**.{cpp,h}
Manual changes:
* nsTDependentSubstring.cpp was relying on include order, prevent that
from being changed by clang-format.
* Missing nsAtom.h include from nsGkAtoms.h
* nsWindowsHelpers.h needed to keep the include order
* MemoryPressureLevelMac.h needed mozilla/Attributes.h
Differential Revision: https://phabricator.services.mozilla.com/D311687
68 lines
2.2 KiB
C++
68 lines
2.2 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef nsUTF8Utils_h_
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#define nsUTF8Utils_h_
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// NB: This code may be used from non-XPCOM code, in particular, the
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// standalone updater executable. That is, this file may be used in
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// two ways: if MOZILLA_INTERNAL_API is defined, this file will
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// provide signatures for the Mozilla abstract string types. It will
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// use XPCOM assertion/debugging macros, etc.
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#include <type_traits>
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#include "mozilla/Assertions.h"
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#include "nsCharTraits.h"
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#ifdef MOZILLA_INTERNAL_API
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# define UTF8UTILS_WARNING(msg) NS_WARNING(msg)
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#else
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# define UTF8UTILS_WARNING(msg)
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#endif
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class UTF8traits {
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public:
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static bool isASCII(char aChar) { return (aChar & 0x80) == 0x00; }
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static bool isInSeq(char aChar) { return (aChar & 0xC0) == 0x80; }
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static bool is2byte(char aChar) { return (aChar & 0xE0) == 0xC0; }
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static bool is3byte(char aChar) { return (aChar & 0xF0) == 0xE0; }
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static bool is4byte(char aChar) { return (aChar & 0xF8) == 0xF0; }
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static bool is5byte(char aChar) { return (aChar & 0xFC) == 0xF8; }
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static bool is6byte(char aChar) { return (aChar & 0xFE) == 0xFC; }
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// return the number of bytes in a sequence beginning with aChar
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static int bytes(char aChar) {
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if (isASCII(aChar)) {
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return 1;
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}
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if (is2byte(aChar)) {
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return 2;
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}
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if (is3byte(aChar)) {
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return 3;
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}
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if (is4byte(aChar)) {
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return 4;
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}
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MOZ_ASSERT_UNREACHABLE("should not be used for in-sequence characters");
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return 1;
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}
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};
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template <typename Char, typename UnsignedT>
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inline UnsignedT RewindToPriorUTF8Codepoint(const Char* utf8Chars,
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UnsignedT index) {
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static_assert(std::is_same_v<Char, char> ||
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std::is_same_v<Char, unsigned char> ||
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std::is_same_v<Char, signed char>,
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"UTF-8 data must be in 8-bit units");
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static_assert(std::is_unsigned_v<UnsignedT>, "index type must be unsigned");
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while (index > 0 && (utf8Chars[index] & 0xC0) == 0x80) --index;
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return index;
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}
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#undef UTF8UTILS_WARNING
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#endif /* !defined(nsUTF8Utils_h_) */
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