1/* 2 * Copyright (C) 2013 Google Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are 6 * met: 7 * 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above 11 * copyright notice, this list of conditions and the following disclaimer 12 * in the documentation and/or other materials provided with the 13 * distribution. 14 * * Neither the name of Google Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived from 16 * this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31#include "config.h" 32#include "core/html/imports/HTMLImport.h" 33 34#include "core/dom/Document.h" 35#include "core/html/imports/HTMLImportStateResolver.h" 36#include "wtf/Vector.h" 37 38namespace blink { 39 40HTMLImport* HTMLImport::root() 41{ 42 HTMLImport* i = this; 43 while (i->parent()) 44 i = i->parent(); 45 return i; 46} 47 48bool HTMLImport::precedes(HTMLImport* import) 49{ 50 for (HTMLImport* i = this; i; i = traverseNext(i)) { 51 if (i == import) 52 return true; 53 } 54 55 return false; 56} 57 58bool HTMLImport::formsCycle() const 59{ 60 for (const HTMLImport* i = this->parent(); i; i = i->parent()) { 61 if (i->document() == this->document()) 62 return true; 63 } 64 65 return false; 66 67} 68 69void HTMLImport::appendImport(HTMLImport* child) 70{ 71 appendChild(child); 72 73 // This prevents HTML parser from going beyond the 74 // blockage line before the precise state is computed by recalcState(). 75 if (child->isSync()) 76 m_state = HTMLImportState::blockedState(); 77 78 stateWillChange(); 79} 80 81void HTMLImport::stateDidChange() 82{ 83 if (!state().shouldBlockScriptExecution()) { 84 if (Document* document = this->document()) 85 document->didLoadAllImports(); 86 } 87} 88 89void HTMLImport::recalcTreeState(HTMLImport* root) 90{ 91 WillBeHeapHashMap<RawPtrWillBeMember<HTMLImport>, HTMLImportState> snapshot; 92 WillBeHeapVector<RawPtrWillBeMember<HTMLImport> > updated; 93 94 for (HTMLImport* i = root; i; i = traverseNext(i)) { 95 snapshot.add(i, i->state()); 96 i->m_state = HTMLImportState::invalidState(); 97 } 98 99 // The post-visit DFS order matters here because 100 // HTMLImportStateResolver in recalcState() Depends on 101 // |m_state| of its children and precedents of ancestors. 102 // Accidental cycle dependency of state computation is prevented 103 // by invalidateCachedState() and isStateCacheValid() check. 104 for (HTMLImport* i = traverseFirstPostOrder(root); i; i = traverseNextPostOrder(i)) { 105 ASSERT(!i->m_state.isValid()); 106 i->m_state = HTMLImportStateResolver(i).resolve(); 107 108 HTMLImportState newState = i->state(); 109 HTMLImportState oldState = snapshot.get(i); 110 // Once the state reaches Ready, it shouldn't go back. 111 ASSERT(!oldState.isReady() || oldState <= newState); 112 if (newState != oldState) 113 updated.append(i); 114 } 115 116 for (size_t i = 0; i < updated.size(); ++i) 117 updated[i]->stateDidChange(); 118} 119 120#if !defined(NDEBUG) 121void HTMLImport::show() 122{ 123 root()->showTree(this, 0); 124} 125 126void HTMLImport::showTree(HTMLImport* highlight, unsigned depth) 127{ 128 for (unsigned i = 0; i < depth*4; ++i) 129 fprintf(stderr, " "); 130 131 fprintf(stderr, "%s", this == highlight ? "*" : " "); 132 showThis(); 133 fprintf(stderr, "\n"); 134 for (HTMLImport* child = firstChild(); child; child = child->next()) 135 child->showTree(highlight, depth + 1); 136} 137 138void HTMLImport::showThis() 139{ 140 fprintf(stderr, "%p state=%d", this, m_state.peekValueForDebug()); 141} 142#endif 143 144} // namespace blink 145