| /* |
| * Copyright (C) 2013 Google Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following disclaimer |
| * in the documentation and/or other materials provided with the |
| * distribution. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "config.h" |
| #include "core/html/imports/HTMLImport.h" |
| |
| #include "core/dom/Document.h" |
| #include "core/html/imports/HTMLImportStateResolver.h" |
| |
| namespace WebCore { |
| |
| HTMLImport* HTMLImport::root() |
| { |
| HTMLImport* i = this; |
| while (i->parent()) |
| i = i->parent(); |
| return i; |
| } |
| |
| bool HTMLImport::precedes(HTMLImport* import) |
| { |
| for (HTMLImport* i = this; i; i = traverseNext(i)) { |
| if (i == import) |
| return true; |
| } |
| |
| return false; |
| } |
| |
| bool HTMLImport::formsCycle() const |
| { |
| for (const HTMLImport* i = this->parent(); i; i = i->parent()) { |
| if (i->document() == this->document()) |
| return true; |
| } |
| |
| return false; |
| |
| } |
| |
| void HTMLImport::appendImport(HTMLImport* child) |
| { |
| appendChild(child); |
| |
| // This prevents HTML parser from going beyond the |
| // blockage line before the precise state is computed by recalcState(). |
| if (child->isSync()) |
| m_state = HTMLImportState::blockedState(); |
| |
| stateWillChange(); |
| } |
| |
| void HTMLImport::stateDidChange() |
| { |
| if (!state().shouldBlockScriptExecution()) { |
| if (Document* document = this->document()) |
| document->didLoadAllImports(); |
| } |
| } |
| |
| void HTMLImport::recalcTreeState(HTMLImport* root) |
| { |
| HashMap<HTMLImport*, HTMLImportState> snapshot; |
| Vector<HTMLImport*> updated; |
| |
| for (HTMLImport* i = root; i; i = traverseNext(i)) { |
| snapshot.add(i, i->state()); |
| i->m_state = HTMLImportState::invalidState(); |
| } |
| |
| // The post-visit DFS order matters here because |
| // HTMLImportStateResolver in recalcState() Depends on |
| // |m_state| of its children and precedents of ancestors. |
| // Accidental cycle dependency of state computation is prevented |
| // by invalidateCachedState() and isStateCacheValid() check. |
| for (HTMLImport* i = traverseFirstPostOrder(root); i; i = traverseNextPostOrder(i)) { |
| ASSERT(!i->m_state.isValid()); |
| i->m_state = HTMLImportStateResolver(i).resolve(); |
| |
| HTMLImportState newState = i->state(); |
| HTMLImportState oldState = snapshot.get(i); |
| // Once the state reaches Ready, it shouldn't go back. |
| ASSERT(!oldState.isReady() || oldState <= newState); |
| if (newState != oldState) |
| updated.append(i); |
| } |
| |
| for (size_t i = 0; i < updated.size(); ++i) |
| updated[i]->stateDidChange(); |
| } |
| |
| #if !defined(NDEBUG) |
| void HTMLImport::show() |
| { |
| root()->showTree(this, 0); |
| } |
| |
| void HTMLImport::showTree(HTMLImport* highlight, unsigned depth) |
| { |
| for (unsigned i = 0; i < depth*4; ++i) |
| fprintf(stderr, " "); |
| |
| fprintf(stderr, "%s", this == highlight ? "*" : " "); |
| showThis(); |
| fprintf(stderr, "\n"); |
| for (HTMLImport* child = firstChild(); child; child = child->next()) |
| child->showTree(highlight, depth + 1); |
| } |
| |
| void HTMLImport::showThis() |
| { |
| fprintf(stderr, "%p state=%d", this, m_state.peekValueForDebug()); |
| } |
| #endif |
| |
| } // namespace WebCore |