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      1 /*
      2  * Copyright (C) 2009 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 #ifndef WebCString_h
     32 #define WebCString_h
     33 
     34 #include "WebCommon.h"
     35 
     36 #if WEBKIT_IMPLEMENTATION
     37 #include <wtf/Forward.h>
     38 #else
     39 #include <string>
     40 #endif
     41 
     42 namespace WTF {
     43 class CString;
     44 }
     45 
     46 namespace WebKit {
     47 
     48 class WebCStringPrivate;
     49 class WebString;
     50 
     51 // A single-byte string container with unspecified encoding.  It is
     52 // inexpensive to copy a WebCString object.
     53 //
     54 // WARNING: It is not safe to pass a WebCString across threads!!!
     55 //
     56 class WebCString {
     57 public:
     58     ~WebCString() { reset(); }
     59 
     60     WebCString() : m_private(0) { }
     61 
     62     WebCString(const char* data, size_t len) : m_private(0)
     63     {
     64         assign(data, len);
     65     }
     66 
     67     WebCString(const WebCString& s) : m_private(0) { assign(s); }
     68 
     69     WebCString& operator=(const WebCString& s)
     70     {
     71         assign(s);
     72         return *this;
     73     }
     74 
     75     // Returns 0 if both strings are equals, a value greater than zero if the
     76     // first character that does not match has a greater value in this string
     77     // than in |other|, or a value less than zero to indicate the opposite.
     78     WEBKIT_API int compare(const WebCString& other) const;
     79 
     80     WEBKIT_API void reset();
     81     WEBKIT_API void assign(const WebCString&);
     82     WEBKIT_API void assign(const char* data, size_t len);
     83 
     84     WEBKIT_API size_t length() const;
     85     WEBKIT_API const char* data() const;
     86 
     87     bool isEmpty() const { return !length(); }
     88     bool isNull() const { return !m_private; }
     89 
     90     WEBKIT_API WebString utf16() const;
     91 
     92     WEBKIT_API static WebCString fromUTF16(const WebUChar* data, size_t length);
     93     WEBKIT_API static WebCString fromUTF16(const WebUChar* data);
     94 
     95 #if WEBKIT_IMPLEMENTATION
     96     WebCString(const WTF::CString&);
     97     WebCString& operator=(const WTF::CString&);
     98     operator WTF::CString() const;
     99 #else
    100     WebCString(const std::string& s) : m_private(0)
    101     {
    102         assign(s.data(), s.length());
    103     }
    104 
    105     WebCString& operator=(const std::string& s)
    106     {
    107         assign(s.data(), s.length());
    108         return *this;
    109     }
    110 
    111     operator std::string() const
    112     {
    113         size_t len = length();
    114         return len ? std::string(data(), len) : std::string();
    115     }
    116 
    117     template <class UTF16String>
    118     static WebCString fromUTF16(const UTF16String& s)
    119     {
    120         return fromUTF16(s.data(), s.length());
    121     }
    122 #endif
    123 
    124 private:
    125     void assign(WebCStringPrivate*);
    126     WebCStringPrivate* m_private;
    127 };
    128 
    129 inline bool operator<(const WebCString& a, const WebCString& b)
    130 {
    131     return a.compare(b) < 0;
    132 }
    133 
    134 } // namespace WebKit
    135 
    136 #endif
    137