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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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
#include "nsUnicharUtils.h"
#include "nsUnicodeProperties.h"
#include "nsUTF8Utils.h"
#include "mozilla/Likely.h"
#include "mozilla/HashFunctions.h"
#include "mozilla/intl/UnicodeProperties.h"
#include "mozilla/StaticPrefs_layout.h"
// We map x -> x, except for upper-case letters,
// which we map to their lower-case equivalents.
static const uint8_t gASCIIToLower[128] = {
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b,
0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23,
0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b,
0x3c, 0x3d, 0x3e, 0x3f, 0x40, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73,
0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f,
0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b,
0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77,
0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f,
};
// We want ToLowerCase(uint32_t) and ToLowerCaseASCII(uint32_t) to be fast
// when they're called from within the case-insensitive comparators, so we
// define inlined versions.
static MOZ_ALWAYS_INLINE uint32_t ToLowerCase_inline(uint32_t aChar) {
if (IS_ASCII(aChar)) {
return gASCIIToLower[aChar];
}
return mozilla::intl::UnicodeProperties::ToLower(aChar);
}
static MOZ_ALWAYS_INLINE uint32_t
ToLowerCaseASCII_inline(const uint32_t aChar) {
if (IS_ASCII(aChar)) {
return gASCIIToLower[aChar];
}
return aChar;
}
void ToLowerCase(nsAString& aString) {
char16_t* buf = aString.BeginWriting();
ToLowerCase(buf, buf, aString.Length());
}
void ToLowerCaseASCII(nsAString& aString) {
char16_t* buf = aString.BeginWriting();
ToLowerCaseASCII(buf, buf, aString.Length());
}
char ToLowerCaseASCII(char aChar) {
if (aChar >= 'A' && aChar <= 'Z') {
return aChar + 0x20;
}
return aChar;
}
char16_t ToLowerCaseASCII(char16_t aChar) {
if (aChar >= 'A' && aChar <= 'Z') {
return aChar + 0x20;
}
return aChar;
}
char32_t ToLowerCaseASCII(char32_t aChar) {
if (aChar >= 'A' && aChar <= 'Z') {
return aChar + 0x20;
}
return aChar;
}
char ToUpperCaseASCII(char aChar) {
if (aChar >= 'a' && aChar <= 'z') {
return aChar - 0x20;
}
return aChar;
}
char16_t ToUpperCaseASCII(char16_t aChar) {
if (aChar >= 'a' && aChar <= 'z') {
return aChar - 0x20;
}
return aChar;
}
char32_t ToUpperCaseASCII(char32_t aChar) {
if (aChar >= 'a' && aChar <= 'z') {
return aChar - 0x20;
}
return aChar;
}
void ToLowerCase(const nsAString& aSource, nsAString& aDest) {
const char16_t* in = aSource.BeginReading();
size_t len = aSource.Length();
aDest.SetLength(len);
char16_t* out = aDest.BeginWriting();
ToLowerCase(in, out, len);
}
void ToLowerCaseASCII(const nsAString& aSource, nsAString& aDest) {
const char16_t* in = aSource.BeginReading();
size_t len = aSource.Length();
aDest.SetLength(len);
char16_t* out = aDest.BeginWriting();
ToLowerCaseASCII(in, out, len);
}
uint32_t ToLowerCaseASCII(const uint32_t aChar) {
return ToLowerCaseASCII_inline(aChar);
}
void ToUpperCase(nsAString& aString) {
char16_t* buf = aString.BeginWriting();
ToUpperCase(buf, buf, aString.Length());
}
void ToUpperCase(const nsAString& aSource, nsAString& aDest) {
const char16_t* in = aSource.BeginReading();
size_t len = aSource.Length();
aDest.SetLength(len);
char16_t* out = aDest.BeginWriting();
ToUpperCase(in, out, len);
}
#ifdef MOZILLA_INTERNAL_API
uint32_t ToFoldedCase(uint32_t aChar) {
if (IS_ASCII(aChar)) return gASCIIToLower[aChar];
return mozilla::unicode::GetFoldedcase(aChar);
}
void ToFoldedCase(nsAString& aString) {
char16_t* buf = aString.BeginWriting();
ToFoldedCase(buf, buf, aString.Length());
}
void ToFoldedCase(const char16_t* aIn, char16_t* aOut, size_t aLen) {
for (uint32_t i = 0; i < aLen; i++) {
uint32_t ch = aIn[i];
if (i < aLen - 1 && NS_IS_SURROGATE_PAIR(ch, aIn[i + 1])) {
ch = mozilla::unicode::GetFoldedcase(SURROGATE_TO_UCS4(ch, aIn[i + 1]));
NS_ASSERTION(!IS_IN_BMP(ch), "case mapping crossed BMP/SMP boundary!");
aOut[i++] = H_SURROGATE(ch);
aOut[i] = L_SURROGATE(ch);
continue;
}
aOut[i] = ToFoldedCase(ch);
}
}
uint32_t ToNaked(uint32_t aChar) {
if (IS_ASCII(aChar)) {
return aChar;
}
return mozilla::unicode::GetNaked(aChar);
}
void ToNaked(nsAString& aString) {
uint32_t i = 0;
while (i < aString.Length()) {
uint32_t ch = aString[i];
if (i < aString.Length() - 1 && NS_IS_SURROGATE_PAIR(ch, aString[i + 1])) {
ch = SURROGATE_TO_UCS4(ch, aString[i + 1]);
if (mozilla::unicode::IsCombiningDiacritic(ch)) {
aString.Cut(i, 2);
} else {
ch = mozilla::unicode::GetNaked(ch);
NS_ASSERTION(!IS_IN_BMP(ch), "stripping crossed BMP/SMP boundary!");
aString.Replace(i++, 1, H_SURROGATE(ch));
aString.Replace(i++, 1, L_SURROGATE(ch));
}
continue;
}
if (mozilla::unicode::IsCombiningDiacritic(ch)) {
aString.Cut(i, 1);
} else {
aString.Replace(i++, 1, ToNaked(ch));
}
}
}
int32_t nsCaseInsensitiveStringComparator(const char16_t* lhs,
const char16_t* rhs, size_t lLength,
size_t rLength) {
return (lLength == rLength) ? CaseInsensitiveCompare(lhs, rhs, lLength)
: (lLength > rLength) ? 1
: -1;
}
int32_t nsCaseInsensitiveUTF8StringComparator(const char* lhs, const char* rhs,
size_t lLength, size_t rLength) {
return CaseInsensitiveCompare(lhs, rhs, lLength, rLength);
}
int32_t nsASCIICaseInsensitiveStringComparator(const char16_t* lhs,
const char16_t* rhs,
size_t lLength, size_t rLength) {
if (lLength != rLength) {
if (lLength > rLength) return 1;
return -1;
}
while (rLength) {
// we don't care about surrogates here, because we're only
// lowercasing the ASCII range
char16_t l = *lhs++;
char16_t r = *rhs++;
if (l != r) {
l = ToLowerCaseASCII_inline(l);
r = ToLowerCaseASCII_inline(r);
if (l > r)
return 1;
else if (r > l)
return -1;
}
rLength--;
}
return 0;
}
#endif // MOZILLA_INTERNAL_API
uint32_t ToLowerCase(uint32_t aChar) { return ToLowerCase_inline(aChar); }
void ToLowerCase(const char16_t* aIn, char16_t* aOut, size_t aLen) {
for (size_t i = 0; i < aLen; i++) {
uint32_t ch = aIn[i];
if (i < aLen - 1 && NS_IS_SURROGATE_PAIR(ch, aIn[i + 1])) {
ch = mozilla::intl::UnicodeProperties::ToLower(
SURROGATE_TO_UCS4(ch, aIn[i + 1]));
NS_ASSERTION(!IS_IN_BMP(ch), "case mapping crossed BMP/SMP boundary!");
aOut[i++] = H_SURROGATE(ch);
aOut[i] = L_SURROGATE(ch);
continue;
}
aOut[i] = ToLowerCase(ch);
}
}
void ToLowerCaseASCII(const char16_t* aIn, char16_t* aOut, size_t aLen) {
for (size_t i = 0; i < aLen; i++) {
char16_t ch = aIn[i];
aOut[i] = IS_ASCII_UPPER(ch) ? (ch + 0x20) : ch;
}
}
uint32_t ToUpperCase(uint32_t aChar) {
if (IS_ASCII(aChar)) {
if (IS_ASCII_LOWER(aChar)) {
return aChar - 0x20;
}
return aChar;
}
return mozilla::intl::UnicodeProperties::ToUpper(aChar);
}
void ToUpperCase(const char16_t* aIn, char16_t* aOut, size_t aLen) {
for (size_t i = 0; i < aLen; i++) {
uint32_t ch = aIn[i];
if (i < aLen - 1 && NS_IS_SURROGATE_PAIR(ch, aIn[i + 1])) {
ch = mozilla::intl::UnicodeProperties::ToUpper(
SURROGATE_TO_UCS4(ch, aIn[i + 1]));
NS_ASSERTION(!IS_IN_BMP(ch), "case mapping crossed BMP/SMP boundary!");
aOut[i++] = H_SURROGATE(ch);
aOut[i] = L_SURROGATE(ch);
continue;
}
aOut[i] = ToUpperCase(ch);
}
}
uint32_t ToTitleCase(uint32_t aChar) {
if (IS_ASCII(aChar)) {
return ToUpperCase(aChar);
}
return mozilla::unicode::GetTitlecaseForLower(aChar);
}
int32_t CaseInsensitiveCompare(const char16_t* a, const char16_t* b,
size_t len) {
NS_ASSERTION(a && b, "Do not pass in invalid pointers!");
if (len) {
do {
uint32_t c1 = *a++;
uint32_t c2 = *b++;
// Unfortunately, we need to check for surrogates BEFORE we check
// for equality, because we could have identical high surrogates
// but non-identical characters, so we can't just skip them
// If c1 isn't a surrogate, we don't bother to check c2;
// in the case where it _is_ a surrogate, we're definitely going to get
// a mismatch, and don't need to interpret and lowercase it
if (len > 1 && NS_IS_SURROGATE_PAIR(c1, *a)) {
c1 = SURROGATE_TO_UCS4(c1, *a++);
if (NS_IS_SURROGATE_PAIR(c2, *b)) {
c2 = SURROGATE_TO_UCS4(c2, *b++);
}
// If c2 wasn't a surrogate, decrementing len means we'd stop
// short of the end of string b, but that doesn't actually matter
// because we're going to find a mismatch and return early
--len;
}
if (c1 != c2) {
c1 = ToLowerCase_inline(c1);
c2 = ToLowerCase_inline(c2);
if (c1 != c2) {
if (c1 < c2) {
return -1;
}
return 1;
}
}
} while (--len != 0);
}
return 0;
}
// Inlined definition of GetLowerUTF8Codepoint, which we use because we want
// to be fast when called from the case-insensitive comparators.
static MOZ_ALWAYS_INLINE uint32_t GetLowerUTF8Codepoint_inline(
const char* aStr, const char* aEnd, const char** aNext) {
// Convert to unsigned char so that stuffing chars into PRUint32s doesn't
// sign extend.
const unsigned char* str = (unsigned char*)aStr;
if (UTF8traits::isASCII(str[0])) {
// It's ASCII; just convert to lower-case and return it.
*aNext = aStr + 1;
return gASCIIToLower[*str];
}
if (UTF8traits::is2byte(str[0]) && MOZ_LIKELY(aStr + 1 < aEnd)) {
// It's a two-byte sequence, so it looks like
// 110XXXXX 10XXXXXX.
// This is definitely in the BMP, so we can store straightaway into a
// uint16_t.
uint16_t c;
c = (str[0] & 0x1F) << 6;
c += (str[1] & 0x3F);
// we don't go through ToLowerCase here, because we know this isn't
// an ASCII character so the ASCII fast-path there is useless
c = mozilla::intl::UnicodeProperties::ToLower(c);
*aNext = aStr + 2;
return c;
}
if (UTF8traits::is3byte(str[0]) && MOZ_LIKELY(aStr + 2 < aEnd)) {
// It's a three-byte sequence, so it looks like
// 1110XXXX 10XXXXXX 10XXXXXX.
// This will just barely fit into 16-bits, so store into a uint16_t.
uint16_t c;
c = (str[0] & 0x0F) << 12;
c += (str[1] & 0x3F) << 6;
c += (str[2] & 0x3F);
c = mozilla::intl::UnicodeProperties::ToLower(c);
*aNext = aStr + 3;
return c;
}
if (UTF8traits::is4byte(str[0]) && MOZ_LIKELY(aStr + 3 < aEnd)) {
// It's a four-byte sequence, so it looks like
// 11110XXX 10XXXXXX 10XXXXXX 10XXXXXX.
uint32_t c;
c = (str[0] & 0x07) << 18;
c += (str[1] & 0x3F) << 12;
c += (str[2] & 0x3F) << 6;
c += (str[3] & 0x3F);
c = mozilla::intl::UnicodeProperties::ToLower(c);
*aNext = aStr + 4;
return c;
}
// Hm, we don't understand this sequence.
return -1;
}
uint32_t GetLowerUTF8Codepoint(const char* aStr, const char* aEnd,
const char** aNext) {
return GetLowerUTF8Codepoint_inline(aStr, aEnd, aNext);
}
int32_t CaseInsensitiveCompare(const char* aLeft, const char* aRight,
size_t aLeftBytes, size_t aRightBytes) {
const char* leftEnd = aLeft + aLeftBytes;
const char* rightEnd = aRight + aRightBytes;
while (aLeft < leftEnd && aRight < rightEnd) {
uint32_t leftChar = GetLowerUTF8Codepoint_inline(aLeft, leftEnd, &aLeft);
if (MOZ_UNLIKELY(leftChar == uint32_t(-1))) return -1;
uint32_t rightChar =
GetLowerUTF8Codepoint_inline(aRight, rightEnd, &aRight);
if (MOZ_UNLIKELY(rightChar == uint32_t(-1))) return -1;
// Now leftChar and rightChar are lower-case, so we can compare them.
if (leftChar != rightChar) {
if (leftChar > rightChar) return 1;
return -1;
}
}
// Make sure that if one string is longer than the other we return the
// correct result.
if (aLeft < leftEnd) return 1;
if (aRight < rightEnd) return -1;
return 0;
}
static MOZ_ALWAYS_INLINE uint32_t
GetLowerUTF8Codepoint_inline(const char* aStr, const char* aEnd,
const char** aNext, bool aMatchDiacritics) {
uint32_t c;
for (;;) {
c = GetLowerUTF8Codepoint_inline(aStr, aEnd, aNext);
if (aMatchDiacritics) {
break;
}
if (!mozilla::unicode::IsCombiningDiacritic(c)) {
break;
}
aStr = *aNext;
}
return c;
}
bool CaseInsensitiveUTF8CharsEqual(const char* aLeft, const char* aRight,
const char* aLeftEnd, const char* aRightEnd,
const char** aLeftNext,
const char** aRightNext, bool* aErr,
bool aMatchDiacritics) {
NS_ASSERTION(aLeftNext, "Out pointer shouldn't be null.");
NS_ASSERTION(aRightNext, "Out pointer shouldn't be null.");
NS_ASSERTION(aErr, "Out pointer shouldn't be null.");
NS_ASSERTION(aLeft < aLeftEnd, "aLeft must be less than aLeftEnd.");
NS_ASSERTION(aRight < aRightEnd, "aRight must be less than aRightEnd.");
uint32_t leftChar = GetLowerUTF8Codepoint_inline(aLeft, aLeftEnd, aLeftNext,
aMatchDiacritics);
if (MOZ_UNLIKELY(leftChar == uint32_t(-1))) {
*aErr = true;
return false;
}
uint32_t rightChar = GetLowerUTF8Codepoint_inline(
aRight, aRightEnd, aRightNext, aMatchDiacritics);
if (MOZ_UNLIKELY(rightChar == uint32_t(-1))) {
*aErr = true;
return false;
}
// Can't have an error past this point.
*aErr = false;
if (!aMatchDiacritics) {
leftChar = ToNaked(leftChar);
rightChar = ToNaked(rightChar);
}
return leftChar == rightChar;
}
namespace mozilla {
uint32_t HashUTF8AsUTF16(const char* aUTF8, size_t aLength, bool* aErr) {
uint32_t hash = 0;
const char* s = aUTF8;
const char* end = aUTF8 + aLength;
*aErr = false;
while (s < end) {
uint32_t ucs4 = UTF8CharEnumerator::NextChar(&s, end, aErr);
if (*aErr) {
return 0;
}
if (ucs4 < PLANE1_BASE) {
hash = AddToHash(hash, ucs4);
} else {
hash = AddToHash(hash, H_SURROGATE(ucs4), L_SURROGATE(ucs4));
}
}
return hash;
}
bool IsSegmentBreakSkipChar(uint32_t u) {
return intl::UnicodeProperties::IsEastAsianWidthFHWexcludingEmoji(u) &&
intl::UnicodeProperties::GetScriptCode(u) != intl::Script::HANGUL;
}
bool IsPunctuationForWordSelect(char16_t aCh) {
const uint8_t cat = unicode::GetGeneralCategory(aCh);
switch (cat) {
case HB_UNICODE_GENERAL_CATEGORY_CONNECT_PUNCTUATION: /* Pc */
if (aCh == '_' && !StaticPrefs::layout_word_select_stop_at_underscore()) {
return false;
}
[[fallthrough]];
case HB_UNICODE_GENERAL_CATEGORY_DASH_PUNCTUATION: /* Pd */
case HB_UNICODE_GENERAL_CATEGORY_CLOSE_PUNCTUATION: /* Pe */
case HB_UNICODE_GENERAL_CATEGORY_FINAL_PUNCTUATION: /* Pf */
case HB_UNICODE_GENERAL_CATEGORY_INITIAL_PUNCTUATION: /* Pi */
case HB_UNICODE_GENERAL_CATEGORY_OTHER_PUNCTUATION: /* Po */
case HB_UNICODE_GENERAL_CATEGORY_OPEN_PUNCTUATION: /* Ps */
case HB_UNICODE_GENERAL_CATEGORY_CURRENCY_SYMBOL: /* Sc */
// Deliberately omitted:
// case HB_UNICODE_GENERAL_CATEGORY_MODIFIER_SYMBOL: /* Sk */
case HB_UNICODE_GENERAL_CATEGORY_MATH_SYMBOL: /* Sm */
case HB_UNICODE_GENERAL_CATEGORY_OTHER_SYMBOL: /* So */
return true;
default:
return false;
}
}
} // namespace mozilla