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