1/*
2 * Copyright (C) 2008, 2009, 2012, 2013 Apple 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
6 * are met:
7 *
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 * 3.  Neither the name of Apple Inc. ("Apple") nor the names of
14 *     its contributors may be used to endorse or promote products derived
15 *     from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#ifndef SourceProvider_h
30#define SourceProvider_h
31
32#include <wtf/PassOwnPtr.h>
33#include <wtf/RefCounted.h>
34#include <wtf/text/TextPosition.h>
35#include <wtf/text/WTFString.h>
36
37namespace JSC {
38
39    class SourceProvider : public RefCounted<SourceProvider> {
40    public:
41        static const intptr_t nullID = 1;
42
43        JS_EXPORT_PRIVATE SourceProvider(const String& url, const TextPosition& startPosition);
44
45        JS_EXPORT_PRIVATE virtual ~SourceProvider();
46
47        virtual const String& source() const = 0;
48        String getRange(int start, int end) const
49        {
50            return source().substringSharingImpl(start, end - start);
51        }
52
53        const String& url() { return m_url; }
54        TextPosition startPosition() const { return m_startPosition; }
55        intptr_t asID()
56        {
57            ASSERT(this);
58            if (!this) // Be defensive in release mode.
59                return nullID;
60            if (!m_id)
61                getID();
62            return m_id;
63        }
64
65        bool isValid() const { return m_validated; }
66        void setValid() { m_validated = true; }
67
68    private:
69
70        JS_EXPORT_PRIVATE void getID();
71        Vector<size_t>& lineStarts();
72
73        String m_url;
74        TextPosition m_startPosition;
75        bool m_validated : 1;
76        uintptr_t m_id : sizeof(uintptr_t) * 8 - 1;
77    };
78
79    class StringSourceProvider : public SourceProvider {
80    public:
81        static PassRefPtr<StringSourceProvider> create(const String& source, const String& url, const TextPosition& startPosition = TextPosition::minimumPosition())
82        {
83            return adoptRef(new StringSourceProvider(source, url, startPosition));
84        }
85
86        virtual const String& source() const override
87        {
88            return m_source;
89        }
90
91    private:
92        StringSourceProvider(const String& source, const String& url, const TextPosition& startPosition)
93            : SourceProvider(url, startPosition)
94            , m_source(source)
95        {
96        }
97
98        String m_source;
99    };
100
101} // namespace JSC
102
103#endif // SourceProvider_h
104