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      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/HTMLImport.h"
     33 
     34 #include "core/dom/Document.h"
     35 
     36 namespace WebCore {
     37 
     38 Frame* HTMLImport::frame()
     39 {
     40     return master()->frame();
     41 }
     42 
     43 Document* HTMLImport::master()
     44 {
     45     return root()->document();
     46 }
     47 
     48 HTMLImportsController* HTMLImport::controller()
     49 {
     50     return root()->toController();
     51 }
     52 
     53 void HTMLImport::appendChild(HTMLImport* child)
     54 {
     55     ASSERT(child->parent() == this);
     56     ASSERT(!child->hasChildren());
     57 
     58     if (isBlocked())
     59         child->block();
     60     m_children.append(child);
     61     blockAfter(child);
     62 }
     63 
     64 bool HTMLImport::areChilrenLoaded() const
     65 {
     66     for (size_t i = 0; i < m_children.size(); ++i) {
     67         if (!m_children[i]->isLoaded())
     68             return false;
     69     }
     70 
     71     return true;
     72 }
     73 
     74 bool HTMLImport::arePredecessorsLoaded() const
     75 {
     76     HTMLImport* parent = this->parent();
     77     if (!parent)
     78         return true;
     79 
     80     for (size_t i = 0; i < parent->m_children.size(); ++i) {
     81         HTMLImport* sibling = parent->m_children[i];
     82         if (sibling == this)
     83             break;
     84         if (!sibling->isLoaded())
     85             return false;
     86     }
     87 
     88     return true;
     89 }
     90 
     91 void HTMLImport::block()
     92 {
     93     m_blocked = true;
     94 }
     95 
     96 void HTMLImport::unblock()
     97 {
     98     bool wasBlocked = m_blocked;
     99     m_blocked = false;
    100     if (wasBlocked)
    101         didUnblock();
    102 }
    103 
    104 void HTMLImport::didUnblock()
    105 {
    106     ASSERT(!isBlocked());
    107     if (!isProcessing())
    108         return;
    109 
    110     if (Document* document = this->document())
    111         document->didLoadAllImports();
    112 }
    113 
    114 bool HTMLImport::unblock(HTMLImport* import)
    115 {
    116     ASSERT(import->arePredecessorsLoaded());
    117     ASSERT(import->isBlocked() || import->areChilrenLoaded());
    118 
    119     if (import->isBlocked()) {
    120         for (size_t i = 0; i < import->m_children.size(); ++i) {
    121             if (!unblock(import->m_children[i]))
    122                 return false;
    123         }
    124     }
    125 
    126     import->unblock();
    127     return import->isLoaded();
    128 }
    129 
    130 void HTMLImport::block(HTMLImport* import)
    131 {
    132     import->block();
    133     for (size_t i = 0; i < import->m_children.size(); ++i)
    134         block(import->m_children[i]);
    135 }
    136 
    137 void HTMLImport::blockAfter(HTMLImport* child)
    138 {
    139     ASSERT(child->parent() == this);
    140 
    141     for (size_t i = 0; i < m_children.size(); ++i) {
    142         HTMLImport* sibling = m_children[m_children.size() - i - 1];
    143         if (sibling == child)
    144             break;
    145         HTMLImport::block(sibling);
    146     }
    147 
    148     this->block();
    149 
    150     if (HTMLImport* parent = this->parent())
    151         parent->blockAfter(this);
    152 }
    153 
    154 
    155 } // namespace WebCore
    156