mirror of
https://github.com/classilla/tenfourfox.git
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200 lines
5.5 KiB
C++
200 lines
5.5 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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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/* Class to manage lookup of static names in a table. */
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#include "nsCRT.h"
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#include "nscore.h"
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#include "mozilla/HashFunctions.h"
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#include "nsISupportsImpl.h"
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#define PL_ARENA_CONST_ALIGN_MASK 3
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#include "nsStaticNameTable.h"
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using namespace mozilla;
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struct NameTableKey
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{
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explicit NameTableKey(const nsAFlatCString* aKeyStr)
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: mIsUnichar(false)
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{
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mKeyStr.m1b = aKeyStr;
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}
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explicit NameTableKey(const nsAFlatString* aKeyStr)
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: mIsUnichar(true)
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{
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mKeyStr.m2b = aKeyStr;
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}
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bool mIsUnichar;
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union
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{
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const nsAFlatCString* m1b;
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const nsAFlatString* m2b;
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} mKeyStr;
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};
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struct NameTableEntry : public PLDHashEntryHdr
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{
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// no ownership here!
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const nsAFlatCString* mString;
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int32_t mIndex;
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};
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static bool
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matchNameKeysCaseInsensitive(PLDHashTable*, const PLDHashEntryHdr* aHdr,
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const void* aKey)
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{
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const NameTableEntry* entry = static_cast<const NameTableEntry*>(aHdr);
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const NameTableKey* keyValue = static_cast<const NameTableKey*>(aKey);
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const nsAFlatCString* entryKey = entry->mString;
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if (keyValue->mIsUnichar) {
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return keyValue->mKeyStr.m2b->LowerCaseEqualsASCII(entryKey->get(),
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entryKey->Length());
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}
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return keyValue->mKeyStr.m1b->LowerCaseEqualsASCII(entryKey->get(),
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entryKey->Length());
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}
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/*
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* caseInsensitiveHashKey is just like PLDHashTable::HashStringKey except it
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* uses (*s & ~0x20) instead of simply *s. This means that "aFOO" and
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* "afoo" and "aFoo" will all hash to the same thing. It also means
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* that some strings that aren't case-insensensitively equal will hash
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* to the same value, but it's just a hash function so it doesn't
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* matter.
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*/
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static PLDHashNumber
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caseInsensitiveStringHashKey(PLDHashTable* aTable, const void* aKey)
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{
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PLDHashNumber h = 0;
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const NameTableKey* tableKey = static_cast<const NameTableKey*>(aKey);
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if (tableKey->mIsUnichar) {
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for (const char16_t* s = tableKey->mKeyStr.m2b->get();
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*s != '\0';
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s++) {
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h = AddToHash(h, *s & ~0x20);
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}
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} else {
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for (const unsigned char* s = reinterpret_cast<const unsigned char*>(
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tableKey->mKeyStr.m1b->get());
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*s != '\0';
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s++) {
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h = AddToHash(h, *s & ~0x20);
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}
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}
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return h;
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}
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static const struct PLDHashTableOps nametable_CaseInsensitiveHashTableOps = {
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caseInsensitiveStringHashKey,
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matchNameKeysCaseInsensitive,
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PLDHashTable::MoveEntryStub,
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PLDHashTable::ClearEntryStub,
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nullptr,
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};
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nsStaticCaseInsensitiveNameTable::nsStaticCaseInsensitiveNameTable(
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const char* const aNames[], int32_t aLength)
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: mNameArray(nullptr)
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, mNameTable(&nametable_CaseInsensitiveHashTableOps,
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sizeof(NameTableEntry), aLength)
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, mNullStr("")
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{
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MOZ_COUNT_CTOR(nsStaticCaseInsensitiveNameTable);
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MOZ_ASSERT(aNames, "null name table");
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MOZ_ASSERT(aLength, "0 length");
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mNameArray = (nsDependentCString*)
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moz_xmalloc(aLength * sizeof(nsDependentCString));
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for (int32_t index = 0; index < aLength; ++index) {
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const char* raw = aNames[index];
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#ifdef DEBUG
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{
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// verify invariants of contents
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nsAutoCString temp1(raw);
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nsDependentCString temp2(raw);
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ToLowerCase(temp1);
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MOZ_ASSERT(temp1.Equals(temp2), "upper case char in table");
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MOZ_ASSERT(nsCRT::IsAscii(raw),
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"non-ascii string in table -- "
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"case-insensitive matching won't work right");
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}
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#endif
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// use placement-new to initialize the string object
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nsDependentCString* strPtr = &mNameArray[index];
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new (strPtr) nsDependentCString(raw);
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NameTableKey key(strPtr);
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auto entry = static_cast<NameTableEntry*>(mNameTable.Add(&key, fallible));
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if (!entry) {
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continue;
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}
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NS_ASSERTION(entry->mString == 0, "Entry already exists!");
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entry->mString = strPtr; // not owned!
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entry->mIndex = index;
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}
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#ifdef DEBUG
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mNameTable.MarkImmutable();
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#endif
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}
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nsStaticCaseInsensitiveNameTable::~nsStaticCaseInsensitiveNameTable()
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{
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// manually call the destructor on placement-new'ed objects
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for (uint32_t index = 0; index < mNameTable.EntryCount(); index++) {
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mNameArray[index].~nsDependentCString();
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}
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free((void*)mNameArray);
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MOZ_COUNT_DTOR(nsStaticCaseInsensitiveNameTable);
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}
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int32_t
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nsStaticCaseInsensitiveNameTable::Lookup(const nsACString& aName)
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{
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NS_ASSERTION(mNameArray, "not inited");
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const nsAFlatCString& str = PromiseFlatCString(aName);
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NameTableKey key(&str);
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auto entry = static_cast<NameTableEntry*>(mNameTable.Search(&key));
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return entry ? entry->mIndex : nsStaticCaseInsensitiveNameTable::NOT_FOUND;
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}
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int32_t
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nsStaticCaseInsensitiveNameTable::Lookup(const nsAString& aName)
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{
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NS_ASSERTION(mNameArray, "not inited");
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const nsAFlatString& str = PromiseFlatString(aName);
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NameTableKey key(&str);
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auto entry = static_cast<NameTableEntry*>(mNameTable.Search(&key));
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return entry ? entry->mIndex : nsStaticCaseInsensitiveNameTable::NOT_FOUND;
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}
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const nsAFlatCString&
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nsStaticCaseInsensitiveNameTable::GetStringValue(int32_t aIndex)
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{
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NS_ASSERTION(mNameArray, "not inited");
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if ((NOT_FOUND < aIndex) && ((uint32_t)aIndex < mNameTable.EntryCount())) {
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return mNameArray[aIndex];
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}
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return mNullStr;
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}
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