зеркало из https://github.com/mozilla/gecko-dev.git
468 строки
14 KiB
C++
468 строки
14 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
|
|
/* 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/. */
|
|
|
|
#ifndef nsCharTraits_h___
|
|
#define nsCharTraits_h___
|
|
|
|
#include <ctype.h> // for |EOF|, |WEOF|
|
|
#include <string.h> // for |memcpy|, et al
|
|
#include "mozilla/MemoryChecking.h"
|
|
|
|
// This file may be used (through nsUTF8Utils.h) from non-XPCOM code, in
|
|
// particular the standalone software updater. In that case stub out
|
|
// the macros provided by nsDebug.h which are only usable when linking XPCOM
|
|
|
|
#ifdef NS_NO_XPCOM
|
|
# define NS_WARNING(msg)
|
|
# define NS_ASSERTION(cond, msg)
|
|
# define NS_ERROR(msg)
|
|
#else
|
|
# include "nsDebug.h" // for NS_ASSERTION
|
|
#endif
|
|
|
|
/*
|
|
* Some macros for converting char16_t (UTF-16) to and from Unicode scalar
|
|
* values.
|
|
*
|
|
* Note that UTF-16 represents all Unicode scalar values up to U+10FFFF by
|
|
* using "surrogate pairs". These consist of a high surrogate, i.e. a code
|
|
* point in the range U+D800 - U+DBFF, and a low surrogate, i.e. a code point
|
|
* in the range U+DC00 - U+DFFF, like this:
|
|
*
|
|
* U+D800 U+DC00 = U+10000
|
|
* U+D800 U+DC01 = U+10001
|
|
* ...
|
|
* U+DBFF U+DFFE = U+10FFFE
|
|
* U+DBFF U+DFFF = U+10FFFF
|
|
*
|
|
* These surrogate code points U+D800 - U+DFFF are not themselves valid Unicode
|
|
* scalar values and are not well-formed UTF-16 except as high-surrogate /
|
|
* low-surrogate pairs.
|
|
*/
|
|
|
|
#define PLANE1_BASE uint32_t(0x00010000)
|
|
// High surrogates are in the range 0xD800 -- OxDBFF
|
|
#define NS_IS_HIGH_SURROGATE(u) ((uint32_t(u) & 0xFFFFFC00) == 0xD800)
|
|
// Low surrogates are in the range 0xDC00 -- 0xDFFF
|
|
#define NS_IS_LOW_SURROGATE(u) ((uint32_t(u) & 0xFFFFFC00) == 0xDC00)
|
|
// Faster than testing NS_IS_HIGH_SURROGATE || NS_IS_LOW_SURROGATE
|
|
#define IS_SURROGATE(u) ((uint32_t(u) & 0xFFFFF800) == 0xD800)
|
|
|
|
// Everything else is not a surrogate: 0x000 -- 0xD7FF, 0xE000 -- 0xFFFF
|
|
|
|
// N = (H - 0xD800) * 0x400 + 0x10000 + (L - 0xDC00)
|
|
// I wonder whether we could somehow assert that H is a high surrogate
|
|
// and L is a low surrogate
|
|
#define SURROGATE_TO_UCS4(h, l) \
|
|
(((uint32_t(h) & 0x03FF) << 10) + (uint32_t(l) & 0x03FF) + PLANE1_BASE)
|
|
|
|
// Extract surrogates from a UCS4 char
|
|
// Reference: the Unicode standard 4.0, section 3.9
|
|
// Since (c - 0x10000) >> 10 == (c >> 10) - 0x0080 and
|
|
// 0xD7C0 == 0xD800 - 0x0080,
|
|
// ((c - 0x10000) >> 10) + 0xD800 can be simplified to
|
|
#define H_SURROGATE(c) char16_t(char16_t(uint32_t(c) >> 10) + char16_t(0xD7C0))
|
|
// where it's to be noted that 0xD7C0 is not bitwise-OR'd
|
|
// but added.
|
|
|
|
// Since 0x10000 & 0x03FF == 0,
|
|
// (c - 0x10000) & 0x03FF == c & 0x03FF so that
|
|
// ((c - 0x10000) & 0x03FF) | 0xDC00 is equivalent to
|
|
#define L_SURROGATE(c) \
|
|
char16_t(char16_t(uint32_t(c) & uint32_t(0x03FF)) | char16_t(0xDC00))
|
|
|
|
#define IS_IN_BMP(ucs) (uint32_t(ucs) < PLANE1_BASE)
|
|
#define UCS2_REPLACEMENT_CHAR char16_t(0xFFFD)
|
|
|
|
#define UCS_END uint32_t(0x00110000)
|
|
#define IS_VALID_CHAR(c) ((uint32_t(c) < UCS_END) && !IS_SURROGATE(c))
|
|
#define ENSURE_VALID_CHAR(c) (IS_VALID_CHAR(c) ? (c) : UCS2_REPLACEMENT_CHAR)
|
|
|
|
template <class CharT>
|
|
struct nsCharTraits {};
|
|
|
|
template <>
|
|
struct nsCharTraits<char16_t> {
|
|
typedef char16_t char_type;
|
|
typedef uint16_t unsigned_char_type;
|
|
typedef char incompatible_char_type;
|
|
|
|
static char_type* const sEmptyBuffer;
|
|
|
|
// integer representation of characters:
|
|
typedef int int_type;
|
|
|
|
static char_type to_char_type(int_type aChar) { return char_type(aChar); }
|
|
|
|
static int_type to_int_type(char_type aChar) {
|
|
return int_type(static_cast<unsigned_char_type>(aChar));
|
|
}
|
|
|
|
static bool eq_int_type(int_type aLhs, int_type aRhs) { return aLhs == aRhs; }
|
|
|
|
// |char_type| comparisons:
|
|
|
|
static bool eq(char_type aLhs, char_type aRhs) { return aLhs == aRhs; }
|
|
|
|
static bool lt(char_type aLhs, char_type aRhs) { return aLhs < aRhs; }
|
|
|
|
// operations on s[n] arrays:
|
|
|
|
static char_type* move(char_type* aStr1, const char_type* aStr2, size_t aN) {
|
|
return static_cast<char_type*>(
|
|
memmove(aStr1, aStr2, aN * sizeof(char_type)));
|
|
}
|
|
|
|
static char_type* copy(char_type* aStr1, const char_type* aStr2, size_t aN) {
|
|
return static_cast<char_type*>(
|
|
memcpy(aStr1, aStr2, aN * sizeof(char_type)));
|
|
}
|
|
|
|
static void uninitialize(char_type* aStr, size_t aN) {
|
|
#ifdef DEBUG
|
|
memset(aStr, 0xE4, aN * sizeof(char_type));
|
|
#endif
|
|
MOZ_MAKE_MEM_UNDEFINED(aStr, aN * sizeof(char_type));
|
|
}
|
|
|
|
static char_type* copyASCII(char_type* aStr1, const char* aStr2, size_t aN) {
|
|
for (char_type* s = aStr1; aN--; ++s, ++aStr2) {
|
|
NS_ASSERTION(!(*aStr2 & ~0x7F), "Unexpected non-ASCII character");
|
|
*s = static_cast<char_type>(*aStr2);
|
|
}
|
|
return aStr1;
|
|
}
|
|
|
|
static int compare(const char_type* aStr1, const char_type* aStr2,
|
|
size_t aN) {
|
|
for (; aN--; ++aStr1, ++aStr2) {
|
|
if (!eq(*aStr1, *aStr2)) {
|
|
return to_int_type(*aStr1) - to_int_type(*aStr2);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int compareASCII(const char_type* aStr1, const char* aStr2,
|
|
size_t aN) {
|
|
for (; aN--; ++aStr1, ++aStr2) {
|
|
NS_ASSERTION(!(*aStr2 & ~0x7F), "Unexpected non-ASCII character");
|
|
if (!eq_int_type(to_int_type(*aStr1),
|
|
to_int_type(static_cast<char_type>(*aStr2)))) {
|
|
return to_int_type(*aStr1) -
|
|
to_int_type(static_cast<char_type>(*aStr2));
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
// this version assumes that s2 is null-terminated and s1 has length n.
|
|
// if s1 is shorter than s2 then we return -1; if s1 is longer than s2,
|
|
// we return 1.
|
|
static int compareASCIINullTerminated(const char_type* aStr1, size_t aN,
|
|
const char* aStr2) {
|
|
for (; aN--; ++aStr1, ++aStr2) {
|
|
if (!*aStr2) {
|
|
return 1;
|
|
}
|
|
NS_ASSERTION(!(*aStr2 & ~0x7F), "Unexpected non-ASCII character");
|
|
if (!eq_int_type(to_int_type(*aStr1),
|
|
to_int_type(static_cast<char_type>(*aStr2)))) {
|
|
return to_int_type(*aStr1) -
|
|
to_int_type(static_cast<char_type>(*aStr2));
|
|
}
|
|
}
|
|
|
|
if (*aStr2) {
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Convert c to its lower-case form, but only if c is in the ASCII
|
|
* range. Otherwise leave it alone.
|
|
*/
|
|
static char_type ASCIIToLower(char_type aChar) {
|
|
if (aChar >= 'A' && aChar <= 'Z') {
|
|
return char_type(aChar + ('a' - 'A'));
|
|
}
|
|
|
|
return aChar;
|
|
}
|
|
|
|
static int compareLowerCaseToASCII(const char_type* aStr1, const char* aStr2,
|
|
size_t aN) {
|
|
for (; aN--; ++aStr1, ++aStr2) {
|
|
NS_ASSERTION(!(*aStr2 & ~0x7F), "Unexpected non-ASCII character");
|
|
NS_ASSERTION(!(*aStr2 >= 'A' && *aStr2 <= 'Z'),
|
|
"Unexpected uppercase character");
|
|
char_type lower_s1 = ASCIIToLower(*aStr1);
|
|
if (lower_s1 != static_cast<char_type>(*aStr2)) {
|
|
return to_int_type(lower_s1) -
|
|
to_int_type(static_cast<char_type>(*aStr2));
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
// this version assumes that s2 is null-terminated and s1 has length n.
|
|
// if s1 is shorter than s2 then we return -1; if s1 is longer than s2,
|
|
// we return 1.
|
|
static int compareLowerCaseToASCIINullTerminated(const char_type* aStr1,
|
|
size_t aN,
|
|
const char* aStr2) {
|
|
for (; aN--; ++aStr1, ++aStr2) {
|
|
if (!*aStr2) {
|
|
return 1;
|
|
}
|
|
NS_ASSERTION(!(*aStr2 & ~0x7F), "Unexpected non-ASCII character");
|
|
NS_ASSERTION(!(*aStr2 >= 'A' && *aStr2 <= 'Z'),
|
|
"Unexpected uppercase character");
|
|
char_type lower_s1 = ASCIIToLower(*aStr1);
|
|
if (lower_s1 != static_cast<char_type>(*aStr2)) {
|
|
return to_int_type(lower_s1) -
|
|
to_int_type(static_cast<char_type>(*aStr2));
|
|
}
|
|
}
|
|
|
|
if (*aStr2) {
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static size_t length(const char_type* aStr) {
|
|
size_t result = 0;
|
|
while (!eq(*aStr++, char_type(0))) {
|
|
++result;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
static const char_type* find(const char_type* aStr, size_t aN,
|
|
char_type aChar) {
|
|
while (aN--) {
|
|
if (eq(*aStr, aChar)) {
|
|
return aStr;
|
|
}
|
|
++aStr;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
};
|
|
|
|
template <>
|
|
struct nsCharTraits<char> {
|
|
typedef char char_type;
|
|
typedef unsigned char unsigned_char_type;
|
|
typedef char16_t incompatible_char_type;
|
|
|
|
static char_type* const sEmptyBuffer;
|
|
|
|
// integer representation of characters:
|
|
|
|
typedef int int_type;
|
|
|
|
static char_type to_char_type(int_type aChar) { return char_type(aChar); }
|
|
|
|
static int_type to_int_type(char_type aChar) {
|
|
return int_type(static_cast<unsigned_char_type>(aChar));
|
|
}
|
|
|
|
static bool eq_int_type(int_type aLhs, int_type aRhs) { return aLhs == aRhs; }
|
|
|
|
// |char_type| comparisons:
|
|
|
|
static bool eq(char_type aLhs, char_type aRhs) { return aLhs == aRhs; }
|
|
|
|
static bool lt(char_type aLhs, char_type aRhs) { return aLhs < aRhs; }
|
|
|
|
// operations on s[n] arrays:
|
|
|
|
static char_type* move(char_type* aStr1, const char_type* aStr2, size_t aN) {
|
|
return static_cast<char_type*>(
|
|
memmove(aStr1, aStr2, aN * sizeof(char_type)));
|
|
}
|
|
|
|
static char_type* copy(char_type* aStr1, const char_type* aStr2, size_t aN) {
|
|
return static_cast<char_type*>(
|
|
memcpy(aStr1, aStr2, aN * sizeof(char_type)));
|
|
}
|
|
|
|
static void uninitialize(char_type* aStr, size_t aN) {
|
|
#ifdef DEBUG
|
|
memset(aStr, 0xE4, aN * sizeof(char_type));
|
|
#endif
|
|
MOZ_MAKE_MEM_UNDEFINED(aStr, aN * sizeof(char_type));
|
|
}
|
|
|
|
static char_type* copyASCII(char_type* aStr1, const char* aStr2, size_t aN) {
|
|
return copy(aStr1, aStr2, aN);
|
|
}
|
|
|
|
static int compare(const char_type* aStr1, const char_type* aStr2,
|
|
size_t aN) {
|
|
return memcmp(aStr1, aStr2, aN);
|
|
}
|
|
|
|
static int compareASCII(const char_type* aStr1, const char* aStr2,
|
|
size_t aN) {
|
|
#ifdef DEBUG
|
|
for (size_t i = 0; i < aN; ++i) {
|
|
NS_ASSERTION(!(aStr2[i] & ~0x7F), "Unexpected non-ASCII character");
|
|
}
|
|
#endif
|
|
return compare(aStr1, aStr2, aN);
|
|
}
|
|
|
|
// this version assumes that s2 is null-terminated and s1 has length n.
|
|
// if s1 is shorter than s2 then we return -1; if s1 is longer than s2,
|
|
// we return 1.
|
|
static int compareASCIINullTerminated(const char_type* aStr1, size_t aN,
|
|
const char* aStr2) {
|
|
// can't use strcmp here because we don't want to stop when aStr1
|
|
// contains a null
|
|
for (; aN--; ++aStr1, ++aStr2) {
|
|
if (!*aStr2) {
|
|
return 1;
|
|
}
|
|
NS_ASSERTION(!(*aStr2 & ~0x7F), "Unexpected non-ASCII character");
|
|
if (*aStr1 != *aStr2) {
|
|
return to_int_type(*aStr1) - to_int_type(*aStr2);
|
|
}
|
|
}
|
|
|
|
if (*aStr2) {
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Convert c to its lower-case form, but only if c is ASCII.
|
|
*/
|
|
static char_type ASCIIToLower(char_type aChar) {
|
|
if (aChar >= 'A' && aChar <= 'Z') {
|
|
return char_type(aChar + ('a' - 'A'));
|
|
}
|
|
|
|
return aChar;
|
|
}
|
|
|
|
static int compareLowerCaseToASCII(const char_type* aStr1, const char* aStr2,
|
|
size_t aN) {
|
|
for (; aN--; ++aStr1, ++aStr2) {
|
|
NS_ASSERTION(!(*aStr2 & ~0x7F), "Unexpected non-ASCII character");
|
|
NS_ASSERTION(!(*aStr2 >= 'A' && *aStr2 <= 'Z'),
|
|
"Unexpected uppercase character");
|
|
char_type lower_s1 = ASCIIToLower(*aStr1);
|
|
if (lower_s1 != *aStr2) {
|
|
return to_int_type(lower_s1) - to_int_type(*aStr2);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
// this version assumes that s2 is null-terminated and s1 has length n.
|
|
// if s1 is shorter than s2 then we return -1; if s1 is longer than s2,
|
|
// we return 1.
|
|
static int compareLowerCaseToASCIINullTerminated(const char_type* aStr1,
|
|
size_t aN,
|
|
const char* aStr2) {
|
|
for (; aN--; ++aStr1, ++aStr2) {
|
|
if (!*aStr2) {
|
|
return 1;
|
|
}
|
|
NS_ASSERTION(!(*aStr2 & ~0x7F), "Unexpected non-ASCII character");
|
|
NS_ASSERTION(!(*aStr2 >= 'A' && *aStr2 <= 'Z'),
|
|
"Unexpected uppercase character");
|
|
char_type lower_s1 = ASCIIToLower(*aStr1);
|
|
if (lower_s1 != *aStr2) {
|
|
return to_int_type(lower_s1) - to_int_type(*aStr2);
|
|
}
|
|
}
|
|
|
|
if (*aStr2) {
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static size_t length(const char_type* aStr) { return strlen(aStr); }
|
|
|
|
static const char_type* find(const char_type* aStr, size_t aN,
|
|
char_type aChar) {
|
|
return reinterpret_cast<const char_type*>(
|
|
memchr(aStr, to_int_type(aChar), aN));
|
|
}
|
|
};
|
|
|
|
template <class InputIterator>
|
|
struct nsCharSourceTraits {
|
|
typedef typename InputIterator::difference_type difference_type;
|
|
|
|
static uint32_t readable_distance(const InputIterator& aFirst,
|
|
const InputIterator& aLast) {
|
|
// assumes single fragment
|
|
return uint32_t(aLast.get() - aFirst.get());
|
|
}
|
|
|
|
static const typename InputIterator::value_type* read(
|
|
const InputIterator& aIter) {
|
|
return aIter.get();
|
|
}
|
|
|
|
static void advance(InputIterator& aStr, difference_type aN) {
|
|
aStr.advance(aN);
|
|
}
|
|
};
|
|
|
|
template <class CharT>
|
|
struct nsCharSourceTraits<CharT*> {
|
|
typedef ptrdiff_t difference_type;
|
|
|
|
static uint32_t readable_distance(CharT* aStr) {
|
|
return uint32_t(nsCharTraits<CharT>::length(aStr));
|
|
// return numeric_limits<uint32_t>::max();
|
|
}
|
|
|
|
static uint32_t readable_distance(CharT* aFirst, CharT* aLast) {
|
|
return uint32_t(aLast - aFirst);
|
|
}
|
|
|
|
static const CharT* read(CharT* aStr) { return aStr; }
|
|
|
|
static void advance(CharT*& aStr, difference_type aN) { aStr += aN; }
|
|
};
|
|
|
|
template <class OutputIterator>
|
|
struct nsCharSinkTraits {
|
|
static void write(OutputIterator& aIter,
|
|
const typename OutputIterator::value_type* aStr,
|
|
uint32_t aN) {
|
|
aIter.write(aStr, aN);
|
|
}
|
|
};
|
|
|
|
template <class CharT>
|
|
struct nsCharSinkTraits<CharT*> {
|
|
static void write(CharT*& aIter, const CharT* aStr, uint32_t aN) {
|
|
nsCharTraits<CharT>::move(aIter, aStr, aN);
|
|
aIter += aN;
|
|
}
|
|
};
|
|
|
|
#endif // !defined(nsCharTraits_h___)
|