mirror of
https://github.com/classilla/tenfourfox.git
synced 2024-06-25 04:29:38 +00:00
429 lines
12 KiB
C++
429 lines
12 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* 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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#include "nsUnicharUtils.h"
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#include "nsXPCOMStrings.h"
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#include "nsUTF8Utils.h"
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#include "nsUnicodeProperties.h"
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#include "mozilla/Likely.h"
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#include "mozilla/HashFunctions.h"
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// We map x -> x, except for upper-case letters,
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// which we map to their lower-case equivalents.
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static const uint8_t gASCIIToLower [128] = {
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0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
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0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
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0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
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0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f,
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0x40, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,
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0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f,
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0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,
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0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f,
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};
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#define IS_ASCII(u) ((u) < 0x80)
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#define IS_ASCII_UPPER(u) (('A' <= (u)) && ((u) <= 'Z'))
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#define IS_ASCII_LOWER(u) (('a' <= (u)) && ((u) <= 'z'))
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#define IS_ASCII_ALPHA(u) (IS_ASCII_UPPER(u) || IS_ASCII_LOWER(u))
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#define IS_ASCII_SPACE(u) (' ' == (u))
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// We want ToLowerCase(uint32_t) and ToLowerCaseASCII(uint32_t) to be fast
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// when they're called from within the case-insensitive comparators, so we
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// define inlined versions.
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static MOZ_ALWAYS_INLINE uint32_t
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ToLowerCase_inline(uint32_t aChar)
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{
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if (IS_ASCII(aChar)) {
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return gASCIIToLower[aChar];
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}
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return mozilla::unicode::GetLowercase(aChar);
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}
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static MOZ_ALWAYS_INLINE uint32_t
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ToLowerCaseASCII_inline(const uint32_t aChar)
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{
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if (IS_ASCII(aChar)) {
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return gASCIIToLower[aChar];
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}
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return aChar;
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}
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void
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ToLowerCase(nsAString& aString)
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{
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char16_t *buf = aString.BeginWriting();
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ToLowerCase(buf, buf, aString.Length());
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}
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void
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ToLowerCase(const nsAString& aSource,
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nsAString& aDest)
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{
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const char16_t *in;
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char16_t *out;
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uint32_t len = NS_StringGetData(aSource, &in);
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NS_StringGetMutableData(aDest, len, &out);
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NS_ASSERTION(out, "Uh...");
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ToLowerCase(in, out, len);
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}
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uint32_t
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ToLowerCaseASCII(const uint32_t aChar)
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{
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return ToLowerCaseASCII_inline(aChar);
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}
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void
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ToUpperCase(nsAString& aString)
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{
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char16_t *buf = aString.BeginWriting();
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ToUpperCase(buf, buf, aString.Length());
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}
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void
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ToUpperCase(const nsAString& aSource,
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nsAString& aDest)
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{
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const char16_t *in;
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char16_t *out;
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uint32_t len = NS_StringGetData(aSource, &in);
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NS_StringGetMutableData(aDest, len, &out);
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NS_ASSERTION(out, "Uh...");
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ToUpperCase(in, out, len);
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}
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#ifdef MOZILLA_INTERNAL_API
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int32_t
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nsCaseInsensitiveStringComparator::operator()(const char16_t* lhs,
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const char16_t* rhs,
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uint32_t lLength,
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uint32_t rLength) const
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{
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return (lLength == rLength) ? CaseInsensitiveCompare(lhs, rhs, lLength) :
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(lLength > rLength) ? 1 : -1;
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}
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int32_t
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nsCaseInsensitiveUTF8StringComparator::operator()(const char* lhs,
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const char* rhs,
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uint32_t lLength,
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uint32_t rLength) const
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{
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return CaseInsensitiveCompare(lhs, rhs, lLength, rLength);
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}
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int32_t
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nsASCIICaseInsensitiveStringComparator::operator()(const char16_t* lhs,
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const char16_t* rhs,
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uint32_t lLength,
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uint32_t rLength) const
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{
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if (lLength != rLength) {
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if (lLength > rLength)
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return 1;
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return -1;
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}
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while (rLength) {
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// we don't care about surrogates here, because we're only
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// lowercasing the ASCII range
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char16_t l = *lhs++;
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char16_t r = *rhs++;
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if (l != r) {
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l = ToLowerCaseASCII_inline(l);
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r = ToLowerCaseASCII_inline(r);
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if (l > r)
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return 1;
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else if (r > l)
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return -1;
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}
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rLength--;
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}
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return 0;
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}
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#endif // MOZILLA_INTERNAL_API
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uint32_t
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ToLowerCase(uint32_t aChar)
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{
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return ToLowerCase_inline(aChar);
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}
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void
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ToLowerCase(const char16_t *aIn, char16_t *aOut, uint32_t aLen)
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{
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for (uint32_t i = 0; i < aLen; i++) {
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uint32_t ch = aIn[i];
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if (NS_IS_HIGH_SURROGATE(ch) && i < aLen - 1 &&
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NS_IS_LOW_SURROGATE(aIn[i + 1])) {
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ch = mozilla::unicode::GetLowercase(SURROGATE_TO_UCS4(ch, aIn[i + 1]));
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NS_ASSERTION(!IS_IN_BMP(ch), "case mapping crossed BMP/SMP boundary!");
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aOut[i++] = H_SURROGATE(ch);
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aOut[i] = L_SURROGATE(ch);
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continue;
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}
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aOut[i] = ToLowerCase(ch);
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}
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}
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uint32_t
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ToUpperCase(uint32_t aChar)
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{
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if (IS_ASCII(aChar)) {
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if (IS_ASCII_LOWER(aChar)) {
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return aChar - 0x20;
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}
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return aChar;
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}
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return mozilla::unicode::GetUppercase(aChar);
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}
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void
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ToUpperCase(const char16_t *aIn, char16_t *aOut, uint32_t aLen)
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{
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for (uint32_t i = 0; i < aLen; i++) {
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uint32_t ch = aIn[i];
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if (NS_IS_HIGH_SURROGATE(ch) && i < aLen - 1 &&
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NS_IS_LOW_SURROGATE(aIn[i + 1])) {
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ch = mozilla::unicode::GetUppercase(SURROGATE_TO_UCS4(ch, aIn[i + 1]));
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NS_ASSERTION(!IS_IN_BMP(ch), "case mapping crossed BMP/SMP boundary!");
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aOut[i++] = H_SURROGATE(ch);
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aOut[i] = L_SURROGATE(ch);
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continue;
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}
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aOut[i] = ToUpperCase(ch);
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}
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}
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uint32_t
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ToTitleCase(uint32_t aChar)
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{
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if (IS_ASCII(aChar)) {
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return ToUpperCase(aChar);
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}
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return mozilla::unicode::GetTitlecaseForLower(aChar);
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}
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int32_t
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CaseInsensitiveCompare(const char16_t *a,
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const char16_t *b,
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uint32_t len)
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{
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NS_ASSERTION(a && b, "Do not pass in invalid pointers!");
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if (len) {
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do {
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uint32_t c1 = *a++;
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uint32_t c2 = *b++;
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// Unfortunately, we need to check for surrogates BEFORE we check
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// for equality, because we could have identical high surrogates
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// but non-identical characters, so we can't just skip them
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// If c1 isn't a surrogate, we don't bother to check c2;
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// in the case where it _is_ a surrogate, we're definitely going to get
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// a mismatch, and don't need to interpret and lowercase it
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if (NS_IS_HIGH_SURROGATE(c1) && len > 1 && NS_IS_LOW_SURROGATE(*a)) {
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c1 = SURROGATE_TO_UCS4(c1, *a++);
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if (NS_IS_HIGH_SURROGATE(c2) && NS_IS_LOW_SURROGATE(*b)) {
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c2 = SURROGATE_TO_UCS4(c2, *b++);
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}
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// If c2 wasn't a surrogate, decrementing len means we'd stop
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// short of the end of string b, but that doesn't actually matter
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// because we're going to find a mismatch and return early
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--len;
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}
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if (c1 != c2) {
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c1 = ToLowerCase_inline(c1);
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c2 = ToLowerCase_inline(c2);
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if (c1 != c2) {
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if (c1 < c2) {
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return -1;
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}
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return 1;
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}
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}
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} while (--len != 0);
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}
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return 0;
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}
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// Calculates the codepoint of the UTF8 sequence starting at aStr. Sets aNext
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// to the byte following the end of the sequence.
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//
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// If the sequence is invalid, or if computing the codepoint would take us off
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// the end of the string (as marked by aEnd), returns -1 and does not set
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// aNext. Note that this function doesn't check that aStr < aEnd -- it assumes
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// you've done that already.
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static MOZ_ALWAYS_INLINE uint32_t
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GetLowerUTF8Codepoint(const char* aStr, const char* aEnd, const char **aNext)
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{
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// Convert to unsigned char so that stuffing chars into PRUint32s doesn't
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// sign extend.
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const unsigned char *str = (unsigned char*)aStr;
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if (UTF8traits::isASCII(str[0])) {
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// It's ASCII; just convert to lower-case and return it.
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*aNext = aStr + 1;
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return gASCIIToLower[*str];
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}
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if (UTF8traits::is2byte(str[0]) && MOZ_LIKELY(aStr + 1 < aEnd)) {
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// It's a two-byte sequence, so it looks like
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// 110XXXXX 10XXXXXX.
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// This is definitely in the BMP, so we can store straightaway into a
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// uint16_t.
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uint16_t c;
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c = (str[0] & 0x1F) << 6;
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c += (str[1] & 0x3F);
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// we don't go through ToLowerCase here, because we know this isn't
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// an ASCII character so the ASCII fast-path there is useless
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c = mozilla::unicode::GetLowercase(c);
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*aNext = aStr + 2;
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return c;
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}
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if (UTF8traits::is3byte(str[0]) && MOZ_LIKELY(aStr + 2 < aEnd)) {
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// It's a three-byte sequence, so it looks like
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// 1110XXXX 10XXXXXX 10XXXXXX.
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// This will just barely fit into 16-bits, so store into a uint16_t.
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uint16_t c;
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c = (str[0] & 0x0F) << 12;
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c += (str[1] & 0x3F) << 6;
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c += (str[2] & 0x3F);
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c = mozilla::unicode::GetLowercase(c);
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*aNext = aStr + 3;
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return c;
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}
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if (UTF8traits::is4byte(str[0]) && MOZ_LIKELY(aStr + 3 < aEnd)) {
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// It's a four-byte sequence, so it looks like
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// 11110XXX 10XXXXXX 10XXXXXX 10XXXXXX.
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uint32_t c;
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c = (str[0] & 0x07) << 18;
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c += (str[1] & 0x3F) << 12;
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c += (str[2] & 0x3F) << 6;
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c += (str[3] & 0x3F);
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c = mozilla::unicode::GetLowercase(c);
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*aNext = aStr + 4;
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return c;
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}
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// Hm, we don't understand this sequence.
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return -1;
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}
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int32_t CaseInsensitiveCompare(const char *aLeft,
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const char *aRight,
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uint32_t aLeftBytes,
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uint32_t aRightBytes)
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{
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const char *leftEnd = aLeft + aLeftBytes;
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const char *rightEnd = aRight + aRightBytes;
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while (aLeft < leftEnd && aRight < rightEnd) {
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uint32_t leftChar = GetLowerUTF8Codepoint(aLeft, leftEnd, &aLeft);
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if (MOZ_UNLIKELY(leftChar == uint32_t(-1)))
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return -1;
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uint32_t rightChar = GetLowerUTF8Codepoint(aRight, rightEnd, &aRight);
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if (MOZ_UNLIKELY(rightChar == uint32_t(-1)))
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return -1;
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// Now leftChar and rightChar are lower-case, so we can compare them.
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if (leftChar != rightChar) {
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if (leftChar > rightChar)
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return 1;
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return -1;
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}
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}
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// Make sure that if one string is longer than the other we return the
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// correct result.
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if (aLeft < leftEnd)
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return 1;
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if (aRight < rightEnd)
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return -1;
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return 0;
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}
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bool
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CaseInsensitiveUTF8CharsEqual(const char* aLeft, const char* aRight,
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const char* aLeftEnd, const char* aRightEnd,
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const char** aLeftNext, const char** aRightNext,
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bool* aErr)
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{
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NS_ASSERTION(aLeftNext, "Out pointer shouldn't be null.");
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NS_ASSERTION(aRightNext, "Out pointer shouldn't be null.");
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NS_ASSERTION(aErr, "Out pointer shouldn't be null.");
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NS_ASSERTION(aLeft < aLeftEnd, "aLeft must be less than aLeftEnd.");
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NS_ASSERTION(aRight < aRightEnd, "aRight must be less than aRightEnd.");
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uint32_t leftChar = GetLowerUTF8Codepoint(aLeft, aLeftEnd, aLeftNext);
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if (MOZ_UNLIKELY(leftChar == uint32_t(-1))) {
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*aErr = true;
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return false;
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}
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uint32_t rightChar = GetLowerUTF8Codepoint(aRight, aRightEnd, aRightNext);
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if (MOZ_UNLIKELY(rightChar == uint32_t(-1))) {
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*aErr = true;
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return false;
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}
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// Can't have an error past this point.
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*aErr = false;
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return leftChar == rightChar;
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}
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namespace mozilla {
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uint32_t
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HashUTF8AsUTF16(const char* aUTF8, uint32_t aLength, bool* aErr)
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{
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uint32_t hash = 0;
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const char* s = aUTF8;
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const char* end = aUTF8 + aLength;
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*aErr = false;
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while (s < end)
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{
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uint32_t ucs4 = UTF8CharEnumerator::NextChar(&s, end, aErr);
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if (*aErr) {
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return 0;
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}
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if (ucs4 < PLANE1_BASE) {
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hash = AddToHash(hash, ucs4);
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}
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else {
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hash = AddToHash(hash, H_SURROGATE(ucs4), L_SURROGATE(ucs4));
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}
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}
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return hash;
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}
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} // namespace mozilla
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