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266 lines
8.3 KiB
C++
266 lines
8.3 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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*
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Communicator client code, released
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* March 31, 1998.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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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 "nsString.h"
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#include "nsReadableUtils.h"
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#include "prbit.h"
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#define PL_ARENA_CONST_ALIGN_MASK 3
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#include "nsStaticNameTable.h"
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struct NameTableKey
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{
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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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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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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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PRInt32 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* key)
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{
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const NameTableEntry* entry =
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static_cast<const NameTableEntry *>(aHdr);
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const NameTableKey *keyValue = static_cast<const NameTableKey*>(key);
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const nsAFlatCString* entryKey = entry->mString;
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if (keyValue->mIsUnichar) {
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return keyValue->mKeyStr.m2b->
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LowerCaseEqualsASCII(entryKey->get(), entryKey->Length());
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}
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return keyValue->mKeyStr.m1b->
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LowerCaseEqualsASCII(entryKey->get(), entryKey->Length());
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}
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/*
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* caseInsensitiveHashKey is just like PL_DHashStringKey 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 *table, const void *key)
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{
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PLDHashNumber h = 0;
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const NameTableKey* tableKey = static_cast<const NameTableKey*>(key);
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if (tableKey->mIsUnichar) {
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for (const PRUnichar* s = tableKey->mKeyStr.m2b->get();
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*s != '\0';
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s++)
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h = PR_ROTATE_LEFT32(h, 4) ^ (*s & ~0x20);
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} else {
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for (const unsigned char* s =
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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 = PR_ROTATE_LEFT32(h, 4) ^ (*s & ~0x20);
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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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PL_DHashAllocTable,
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PL_DHashFreeTable,
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caseInsensitiveStringHashKey,
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matchNameKeysCaseInsensitive,
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PL_DHashMoveEntryStub,
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PL_DHashClearEntryStub,
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PL_DHashFinalizeStub,
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nsnull,
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};
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nsStaticCaseInsensitiveNameTable::nsStaticCaseInsensitiveNameTable()
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: mNameArray(nsnull), mNullStr("")
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{
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MOZ_COUNT_CTOR(nsStaticCaseInsensitiveNameTable);
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mNameTable.ops = nsnull;
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}
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nsStaticCaseInsensitiveNameTable::~nsStaticCaseInsensitiveNameTable()
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{
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if (mNameArray) {
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// manually call the destructor on placement-new'ed objects
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for (PRUint32 index = 0; index < mNameTable.entryCount; index++) {
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mNameArray[index].~nsDependentCString();
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}
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nsMemory::Free((void*)mNameArray);
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}
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if (mNameTable.ops)
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PL_DHashTableFinish(&mNameTable);
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MOZ_COUNT_DTOR(nsStaticCaseInsensitiveNameTable);
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}
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bool
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nsStaticCaseInsensitiveNameTable::Init(const char* const aNames[], PRInt32 Count)
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{
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NS_ASSERTION(!mNameArray, "double Init");
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NS_ASSERTION(!mNameTable.ops, "double Init");
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NS_ASSERTION(aNames, "null name table");
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NS_ASSERTION(Count, "0 count");
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mNameArray = (nsDependentCString*)
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nsMemory::Alloc(Count * sizeof(nsDependentCString));
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if (!mNameArray)
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return false;
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if (!PL_DHashTableInit(&mNameTable,
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&nametable_CaseInsensitiveHashTableOps,
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nsnull, sizeof(NameTableEntry), Count)) {
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mNameTable.ops = nsnull;
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return false;
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}
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for (PRInt32 index = 0; index < Count; ++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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nsCAutoString temp1(raw);
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nsDependentCString temp2(raw);
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ToLowerCase(temp1);
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NS_ASSERTION(temp1.Equals(temp2), "upper case char in table");
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NS_ASSERTION(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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NameTableEntry *entry =
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static_cast<NameTableEntry*>
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(PL_DHashTableOperate(&mNameTable, &key,
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PL_DHASH_ADD));
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if (!entry) continue;
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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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return true;
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}
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PRInt32
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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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NS_ASSERTION(mNameTable.ops, "not inited");
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const nsAFlatCString& str = PromiseFlatCString(aName);
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NameTableKey key(&str);
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NameTableEntry *entry =
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static_cast<NameTableEntry*>
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(PL_DHashTableOperate(&mNameTable, &key,
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PL_DHASH_LOOKUP));
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if (PL_DHASH_ENTRY_IS_FREE(entry))
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return nsStaticCaseInsensitiveNameTable::NOT_FOUND;
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return entry->mIndex;
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}
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PRInt32
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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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NS_ASSERTION(mNameTable.ops, "not inited");
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const nsAFlatString& str = PromiseFlatString(aName);
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NameTableKey key(&str);
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NameTableEntry *entry =
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static_cast<NameTableEntry*>
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(PL_DHashTableOperate(&mNameTable, &key,
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PL_DHASH_LOOKUP));
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if (PL_DHASH_ENTRY_IS_FREE(entry))
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return nsStaticCaseInsensitiveNameTable::NOT_FOUND;
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return entry->mIndex;
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}
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const nsAFlatCString&
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nsStaticCaseInsensitiveNameTable::GetStringValue(PRInt32 index)
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{
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NS_ASSERTION(mNameArray, "not inited");
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NS_ASSERTION(mNameTable.ops, "not inited");
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if ((NOT_FOUND < index) && ((PRUint32)index < mNameTable.entryCount)) {
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return mNameArray[index];
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}
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return mNullStr;
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}
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