1/*
2 * Copyright (C) 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 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#ifndef StringHashDumpContext_h
27#define StringHashDumpContext_h
28
29#include <wtf/HashMap.h>
30#include <wtf/SixCharacterHash.h>
31#include <wtf/StdLibExtras.h>
32#include <wtf/StringPrintStream.h>
33#include <wtf/text/CString.h>
34
35namespace WTF {
36
37template<typename T>
38class StringHashDumpContext {
39public:
40    StringHashDumpContext() { }
41
42    CString getID(const T* value)
43    {
44        typename HashMap<const T*, CString>::iterator iter = m_forwardMap.find(value);
45        if (iter != m_forwardMap.end())
46            return iter->value;
47
48        for (unsigned hashValue = toCString(*value).hash(); ; hashValue++) {
49            CString fullHash = integerToSixCharacterHashString(hashValue).data();
50
51            for (unsigned length = 2; length < 6; ++length) {
52                CString shortHash = CString(fullHash.data(), length);
53                if (!m_backwardMap.contains(shortHash)) {
54                    m_forwardMap.add(value, shortHash);
55                    m_backwardMap.add(shortHash, value);
56                    return shortHash;
57                }
58            }
59        }
60    }
61
62    void dumpBrief(const T* value, PrintStream& out)
63    {
64        value->dumpBrief(out, getID(value));
65    }
66
67    CString brief(const T* value)
68    {
69        StringPrintStream out;
70        dumpBrief(value, out);
71        return out.toCString();
72    }
73
74    bool isEmpty() const { return m_forwardMap.isEmpty(); }
75
76    void dump(PrintStream& out, const char* prefix = "") const
77    {
78        out.print(prefix);
79        T::dumpContextHeader(out);
80        out.print("\n");
81
82        Vector<CString> keys;
83        unsigned maxKeySize = 0;
84        for (
85            typename HashMap<CString, const T*>::const_iterator iter = m_backwardMap.begin();
86            iter != m_backwardMap.end();
87            ++iter) {
88            keys.append(iter->key);
89            maxKeySize = std::max(maxKeySize, static_cast<unsigned>(brief(iter->value, iter->key).length()));
90        }
91
92        std::sort(keys.begin(), keys.end());
93
94        for (unsigned i = 0; i < keys.size(); ++i) {
95            const T* value = m_backwardMap.get(keys[i]);
96            out.print(prefix, "    ");
97            CString briefString = brief(value, keys[i]);
98            out.print(briefString);
99            for (unsigned n = briefString.length(); n < maxKeySize; ++n)
100                out.print(" ");
101            out.print(" = ", *value, "\n");
102        }
103    }
104
105public:
106    static CString brief(const T* value, const CString& string)
107    {
108        StringPrintStream out;
109        value->dumpBrief(out, string);
110        return out.toCString();
111    }
112
113    HashMap<const T*, CString> m_forwardMap;
114    HashMap<CString, const T*> m_backwardMap;
115};
116
117} // namespace WTF
118
119using WTF::StringHashDumpContext;
120
121#endif // StringHashDumpContext_h
122
123