2003-07-14 21:21:54 +00:00
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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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2000-08-16 02:07:37 +00:00
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*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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2002-03-19 04:30:17 +00:00
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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2000-08-16 02:07:37 +00:00
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* implied. See the License for the specific language governing
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* rights and limitations under the 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 Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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2003-07-14 21:21:54 +00:00
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* Contributor(s):
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2000-08-16 02:07:37 +00:00
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*
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* Alternatively, the contents of this file may be used under the
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* terms of the GNU Public License (the "GPL"), in which case the
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* provisions of the GPL are applicable instead of those above.
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* If you wish to allow use of your version of this file only
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* under the terms of the GPL and not to allow others to use your
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* version of this file under the NPL, indicate your decision by
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* deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL. If you do not delete
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* the provisions above, a recipient may use your version of this
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* file under either the NPL or the GPL.
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*/
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/* Class to manage lookup of static names in a table. */
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2003-01-17 04:55:10 +00:00
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#include "nsCRT.h"
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2001-08-14 04:18:27 +00:00
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#include "nscore.h"
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#include "nsString.h"
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2001-12-03 00:37:35 +00:00
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#include "nsReadableUtils.h"
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2002-06-26 03:46:39 +00:00
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#define PL_ARENA_CONST_ALIGN_MASK 3
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#include "nsStaticNameTable.h"
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struct nameTableEntry : public PLDHashEntryHdr
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{
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2003-07-14 21:21:54 +00:00
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// no ownership here!
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const char *mKey;
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PRInt32 mIndex;
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2002-06-26 03:46:39 +00:00
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};
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PR_STATIC_CALLBACK(PRBool)
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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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NS_STATIC_CAST(const nameTableEntry *, aHdr);
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const char *keyValue = NS_STATIC_CAST(const char*, key);
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return (nsCRT::strcasecmp(entry->mKey, keyValue)==0);
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}
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2003-01-17 04:55:10 +00:00
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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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PR_STATIC_CALLBACK(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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for (const unsigned char* s =
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NS_STATIC_CAST(const unsigned char*, key);
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*s != '\0';
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s++)
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h = (h >> (PL_DHASH_BITS - 4)) ^ (h << 4) ^ (*s & ~0x20);
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return h;
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}
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PR_STATIC_CALLBACK(const void*)
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getNameKey(PLDHashTable*, PLDHashEntryHdr* aHdr)
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{
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nameTableEntry* entry = NS_STATIC_CAST(nameTableEntry*, aHdr);
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2003-07-14 21:21:54 +00:00
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return entry->mKey;
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}
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2003-04-04 15:10:37 +00:00
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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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getNameKey,
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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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PRBool
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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 PR_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 PR_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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2001-12-03 00:37:35 +00:00
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#endif
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2002-02-18 22:42:37 +00:00
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// use placement-new to initialize the string object
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new (&mNameArray[index]) nsDependentCString(raw);
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2002-06-26 03:46:39 +00:00
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nameTableEntry *entry =
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NS_STATIC_CAST(nameTableEntry*,
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PL_DHashTableOperate(&mNameTable, raw, PL_DHASH_ADD));
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2002-06-26 19:36:24 +00:00
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if (!entry) continue;
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2002-06-26 03:46:39 +00:00
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NS_ASSERTION(entry->mKey == 0, "Entry already exists!");
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entry->mKey = raw; // not owned!
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entry->mIndex = index;
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}
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return PR_TRUE;
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}
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inline PRInt32
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LookupFlatKeyword(const nsAFlatCString& aKeyword,
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PLDHashTable& aTable)
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{
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nameTableEntry *entry =
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NS_STATIC_CAST(nameTableEntry*,
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2003-01-17 04:55:10 +00:00
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PL_DHashTableOperate(&aTable, aKeyword.get(), PL_DHASH_LOOKUP));
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2002-06-26 19:36:24 +00:00
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if (!entry || PL_DHASH_ENTRY_IS_FREE(entry))
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return nsStaticCaseInsensitiveNameTable::NOT_FOUND;
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2002-06-26 03:46:39 +00:00
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return entry->mIndex;
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}
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PRInt32
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2001-11-14 01:33:42 +00:00
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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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2003-01-17 04:55:10 +00:00
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return LookupFlatKeyword(PromiseFlatCString(aName), mNameTable);
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}
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PRInt32
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2001-11-14 01:33:42 +00:00
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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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2003-01-17 04:55:10 +00:00
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nsCAutoString cstring;
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cstring.AssignWithConversion(aName);
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return LookupFlatKeyword(cstring, mNameTable);
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}
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2001-12-03 00:37:35 +00:00
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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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2003-01-17 04:55:10 +00:00
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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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