1 : /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 : /* ***** BEGIN LICENSE BLOCK *****
3 : * Version: MPL 1.1/GPL 2.0/LGPL 2.1
4 : *
5 : * The contents of this file are subject to the Mozilla Public License Version
6 : * 1.1 (the "License"); you may not use this file except in compliance with
7 : * the License. You may obtain a copy of the License at
8 : * http://www.mozilla.org/MPL/
9 : *
10 : * Software distributed under the License is distributed on an "AS IS" basis,
11 : * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
12 : * for the specific language governing rights and limitations under the
13 : * License.
14 : *
15 : * The Original Code is mozilla.org code.
16 : *
17 : * The Initial Developer of the Original Code is
18 : * Netscape Communications Corporation.
19 : * Portions created by the Initial Developer are Copyright (C) 2003
20 : * the Initial Developer. All Rights Reserved.
21 : *
22 : * Contributor(s):
23 : * Dave Hyatt <hyatt@mozilla.org> (Original Author)
24 : * Jan Varga <varga@ku.sk>
25 : *
26 : * Alternatively, the contents of this file may be used under the terms of
27 : * either the GNU General Public License Version 2 or later (the "GPL"), or
28 : * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
29 : * in which case the provisions of the GPL or the LGPL are applicable instead
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35 : * the provisions above, a recipient may use your version of this file under
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37 : *
38 : * ***** END LICENSE BLOCK ***** */
39 :
40 : #include "nsTreeStyleCache.h"
41 : #include "nsISupportsArray.h"
42 : #include "nsStyleSet.h"
43 : #include "mozilla/dom/Element.h"
44 :
45 : // The style context cache impl
46 : nsStyleContext*
47 0 : nsTreeStyleCache::GetStyleContext(nsICSSPseudoComparator* aComparator,
48 : nsPresContext* aPresContext,
49 : nsIContent* aContent,
50 : nsStyleContext* aContext,
51 : nsIAtom* aPseudoElement,
52 : nsISupportsArray* aInputWord)
53 : {
54 : PRUint32 count;
55 0 : aInputWord->Count(&count);
56 0 : nsDFAState startState(0);
57 0 : nsDFAState* currState = &startState;
58 :
59 : // Go ahead and init the transition table.
60 0 : if (!mTransitionTable) {
61 : // Automatic miss. Build the table
62 : mTransitionTable =
63 0 : new nsObjectHashtable(nsnull, nsnull, DeleteDFAState, nsnull);
64 : }
65 :
66 : // The first transition is always made off the supplied pseudo-element.
67 0 : nsTransitionKey key(currState->GetStateID(), aPseudoElement);
68 0 : currState = static_cast<nsDFAState*>(mTransitionTable->Get(&key));
69 :
70 0 : if (!currState) {
71 : // We had a miss. Make a new state and add it to our hash.
72 0 : currState = new nsDFAState(mNextState);
73 0 : mNextState++;
74 0 : mTransitionTable->Put(&key, currState);
75 : }
76 :
77 0 : for (PRUint32 i = 0; i < count; i++) {
78 0 : nsCOMPtr<nsIAtom> pseudo = getter_AddRefs(static_cast<nsIAtom*>(aInputWord->ElementAt(i)));
79 0 : nsTransitionKey key(currState->GetStateID(), pseudo);
80 0 : currState = static_cast<nsDFAState*>(mTransitionTable->Get(&key));
81 :
82 0 : if (!currState) {
83 : // We had a miss. Make a new state and add it to our hash.
84 0 : currState = new nsDFAState(mNextState);
85 0 : mNextState++;
86 0 : mTransitionTable->Put(&key, currState);
87 : }
88 : }
89 :
90 : // We're in a final state.
91 : // Look up our style context for this state.
92 0 : nsStyleContext* result = nsnull;
93 0 : if (mCache)
94 0 : result = static_cast<nsStyleContext*>(mCache->Get(currState));
95 0 : if (!result) {
96 : // We missed the cache. Resolve this pseudo-style.
97 : result = aPresContext->StyleSet()->
98 : ResolveXULTreePseudoStyle(aContent->AsElement(), aPseudoElement,
99 0 : aContext, aComparator).get();
100 :
101 : // Put the style context in our table, transferring the owning reference to the table.
102 0 : if (!mCache) {
103 0 : mCache = new nsObjectHashtable(nsnull, nsnull, ReleaseStyleContext, nsnull);
104 : }
105 0 : mCache->Put(currState, result);
106 : }
107 :
108 0 : return result;
109 : }
110 :
111 : bool
112 0 : nsTreeStyleCache::DeleteDFAState(nsHashKey *aKey,
113 : void *aData,
114 : void *closure)
115 : {
116 0 : nsDFAState* entry = static_cast<nsDFAState*>(aData);
117 0 : delete entry;
118 0 : return true;
119 : }
120 :
121 : bool
122 0 : nsTreeStyleCache::ReleaseStyleContext(nsHashKey *aKey,
123 : void *aData,
124 : void *closure)
125 : {
126 0 : nsStyleContext* context = static_cast<nsStyleContext*>(aData);
127 0 : context->Release();
128 0 : return true;
129 : }
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