The Tor Browser / file comparison
comparison: content/xul/templates/src/nsContentSupportMap.h
content/xul/templates/src/nsContentSupportMap.h
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
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| -1:000000000000 | 0:827599cddf95 |
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| 1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ | |
| 2 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 #ifndef nsContentSupportMap_h__ | |
| 7 #define nsContentSupportMap_h__ | |
| 8 | |
| 9 #include "pldhash.h" | |
| 10 #include "nsTemplateMatch.h" | |
| 11 | |
| 12 /** | |
| 13 * The nsContentSupportMap maintains a mapping from a "resource element" | |
| 14 * in the content tree to the nsTemplateMatch that was used to instantiate it. This | |
| 15 * is necessary to allow the XUL content to be built lazily. Specifically, | |
| 16 * when building "resumes" on a partially-built content element, the builder | |
| 17 * will walk upwards in the content tree to find the first element with an | |
| 18 * 'id' attribute. This element is assumed to be the "resource element", | |
| 19 * and allows the content builder to access the nsTemplateMatch (variable assignments | |
| 20 * and rule information). | |
| 21 */ | |
| 22 class nsContentSupportMap { | |
| 23 public: | |
| 24 nsContentSupportMap() { Init(); } | |
| 25 ~nsContentSupportMap() { Finish(); } | |
| 26 | |
| 27 nsresult Put(nsIContent* aElement, nsTemplateMatch* aMatch) { | |
| 28 if (!mMap.ops) | |
| 29 return NS_ERROR_NOT_INITIALIZED; | |
| 30 | |
| 31 PLDHashEntryHdr* hdr = PL_DHashTableOperate(&mMap, aElement, PL_DHASH_ADD); | |
| 32 if (!hdr) | |
| 33 return NS_ERROR_OUT_OF_MEMORY; | |
| 34 | |
| 35 Entry* entry = reinterpret_cast<Entry*>(hdr); | |
| 36 NS_ASSERTION(entry->mMatch == nullptr, "over-writing entry"); | |
| 37 entry->mContent = aElement; | |
| 38 entry->mMatch = aMatch; | |
| 39 return NS_OK; } | |
| 40 | |
| 41 bool Get(nsIContent* aElement, nsTemplateMatch** aMatch) { | |
| 42 if (!mMap.ops) | |
| 43 return false; | |
| 44 | |
| 45 PLDHashEntryHdr* hdr = PL_DHashTableOperate(&mMap, aElement, PL_DHASH_LOOKUP); | |
| 46 if (PL_DHASH_ENTRY_IS_FREE(hdr)) | |
| 47 return false; | |
| 48 | |
| 49 Entry* entry = reinterpret_cast<Entry*>(hdr); | |
| 50 *aMatch = entry->mMatch; | |
| 51 return true; } | |
| 52 | |
| 53 nsresult Remove(nsIContent* aElement); | |
| 54 | |
| 55 void Clear() { Finish(); Init(); } | |
| 56 | |
| 57 protected: | |
| 58 PLDHashTable mMap; | |
| 59 | |
| 60 void Init(); | |
| 61 void Finish(); | |
| 62 | |
| 63 struct Entry { | |
| 64 PLDHashEntryHdr mHdr; | |
| 65 nsIContent* mContent; | |
| 66 nsTemplateMatch* mMatch; | |
| 67 }; | |
| 68 }; | |
| 69 | |
| 70 #endif |
