1/* 2 * Copyright (C) 2014 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/HTMLImportStateResolver.h" 33 34#include "core/html/imports/HTMLImport.h" 35#include "core/html/imports/HTMLImportChild.h" 36#include "core/html/imports/HTMLImportLoader.h" 37 38namespace blink { 39 40inline bool HTMLImportStateResolver::isBlockingFollowers(HTMLImport* import) 41{ 42 if (!import->isSync()) 43 return false; 44 HTMLImportChild* child = toHTMLImportChild(import); 45 if (!child->loader()->isFirstImport(child)) 46 return false; 47 return !import->state().isReady(); 48} 49 50inline bool HTMLImportStateResolver::shouldBlockScriptExecution() const 51{ 52 // FIXME: Memoize to make this faster. 53 for (HTMLImport* ancestor = m_import; ancestor; ancestor = ancestor->parent()) { 54 for (HTMLImport* predecessor = ancestor->previous(); predecessor; predecessor = predecessor->previous()) { 55 if (isBlockingFollowers(predecessor)) 56 return true; 57 } 58 } 59 60 for (HTMLImport* child = m_import->firstChild(); child; child = child->next()) { 61 if (isBlockingFollowers(child)) 62 return true; 63 } 64 65 return false; 66} 67 68inline bool HTMLImportStateResolver::isActive() const 69{ 70 return !m_import->isDone(); 71} 72 73HTMLImportState HTMLImportStateResolver::resolve() const 74{ 75 if (shouldBlockScriptExecution()) 76 return HTMLImportState(HTMLImportState::BlockingScriptExecution); 77 if (isActive()) 78 return HTMLImportState(HTMLImportState::Active); 79 return HTMLImportState(HTMLImportState::Ready); 80} 81 82} 83 84