1/*
2 * Copyright (C) 2008 Apple Inc. All Rights Reserved.
3 * Copyright (C) 2010 Google Inc. All Rights Reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
17 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
18 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
19 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
21 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
22 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#ifndef CSSPreloadScanner_h
28#define CSSPreloadScanner_h
29
30#include "core/html/parser/HTMLResourcePreloader.h"
31#include "core/html/parser/HTMLToken.h"
32#include "wtf/text/StringBuilder.h"
33
34namespace blink {
35
36class SegmentedString;
37
38class CSSPreloadScanner {
39    WTF_MAKE_NONCOPYABLE(CSSPreloadScanner);
40public:
41    CSSPreloadScanner();
42    ~CSSPreloadScanner();
43
44    void reset();
45
46    void scan(const HTMLToken::DataVector&, const SegmentedString&, PreloadRequestStream&);
47    void scan(const String&, const SegmentedString&, PreloadRequestStream&);
48
49private:
50    enum State {
51        Initial,
52        MaybeComment,
53        Comment,
54        MaybeCommentEnd,
55        RuleStart,
56        Rule,
57        AfterRule,
58        RuleValue,
59        AfterRuleValue,
60        DoneParsingImportRules,
61    };
62
63    template<typename Char>
64    void scanCommon(const Char* begin, const Char* end, const SegmentedString&, PreloadRequestStream&);
65
66    inline void tokenize(UChar, const SegmentedString&);
67    void emitRule(const SegmentedString&);
68
69    State m_state;
70    StringBuilder m_rule;
71    StringBuilder m_ruleValue;
72
73    // Only non-zero during scan()
74    PreloadRequestStream* m_requests;
75};
76
77}
78
79#endif
80