runtime/JSStringBuilder.h

   1 /*
   2  * Copyright (C) 2009 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 JSStringBuilder_h
  27 #define JSStringBuilder_h
  28
  29 #include "ExceptionHelpers.h"
  30 #include "JSString.h"
  31 #include "Vector.h"
  32
  33 namespace JSC {
  34
  35 class JSStringBuilder {
  36 public:
  37     JSStringBuilder()
  38         : m_okay(true)
  39     {
  40     }
  41
  42     void append(const UChar u)
  43     {
  44         m_okay &= buffer.tryAppend(&u, 1);
  45     }
  46
  47     void append(const char* str)
  48     {
  49         append(str, strlen(str));
  50     }
  51
  52     void append(const char* str, size_t len)
  53     {
  54         m_okay &= buffer.tryReserveCapacity(buffer.size() + len);
  55         for (size_t i = 0; i < len; i++) {
  56             UChar u = static_cast<unsigned char>(str[i]);
  57             m_okay &= buffer.tryAppend(&u, 1);
  58         }
  59     }
  60
  61     void append(const UChar* str, size_t len)
  62     {
  63         m_okay &= buffer.tryAppend(str, len);
  64     }
  65
  66     void append(const UString& str)
  67     {
  68         m_okay &= buffer.tryAppend(str.data(), str.size());
  69     }
  70
  71     JSValue build(ExecState* exec)
  72     {
  73         if (!m_okay)
  74             return throwOutOfMemoryError(exec);
  75         buffer.shrinkToFit();
  76         if (!buffer.data())
  77             return throwOutOfMemoryError(exec);
  78         return jsString(exec, UString::adopt(buffer));
  79     }
  80
  81 protected:
  82     Vector<UChar, 64> buffer;
  83     bool m_okay;
  84 };
  85
  86 template<typename StringType1, typename StringType2>
  87 inline JSValue jsMakeNontrivialString(ExecState* exec, StringType1 string1, StringType2 string2)
  88 {
  89     PassRefPtr<UStringImpl> result = tryMakeString(string1, string2);
  90     if (!result)
  91         return throwOutOfMemoryError(exec);
  92     return jsNontrivialString(exec, result);
  93 }
  94
  95 template<typename StringType1, typename StringType2, typename StringType3>
  96 inline JSValue jsMakeNontrivialString(ExecState* exec, StringType1 string1, StringType2 string2, StringType3 string3)
  97 {
  98     PassRefPtr<UStringImpl> result = tryMakeString(string1, string2, string3);
  99     if (!result)
 100         return throwOutOfMemoryError(exec);
 101     return jsNontrivialString(exec, result);
 102 }
 103
 104 template<typename StringType1, typename StringType2, typename StringType3, typename StringType4>
 105 inline JSValue jsMakeNontrivialString(ExecState* exec, StringType1 string1, StringType2 string2, StringType3 string3, StringType4 string4)
 106 {
 107     PassRefPtr<UStringImpl> result = tryMakeString(string1, string2, string3, string4);
 108     if (!result)
 109         return throwOutOfMemoryError(exec);
 110     return jsNontrivialString(exec, result);
 111 }
 112
 113 template<typename StringType1, typename StringType2, typename StringType3, typename StringType4, typename StringType5>
 114 inline JSValue jsMakeNontrivialString(ExecState* exec, StringType1 string1, StringType2 string2, StringType3 string3, StringType4 string4, StringType5 string5)
 115 {
 116     PassRefPtr<UStringImpl> result = tryMakeString(string1, string2, string3, string4, string5);
 117     if (!result)
 118         return throwOutOfMemoryError(exec);
 119     return jsNontrivialString(exec, result);
 120 }
 121
 122 template<typename StringType1, typename StringType2, typename StringType3, typename StringType4, typename StringType5, typename StringType6>
 123 inline JSValue jsMakeNontrivialString(ExecState* exec, StringType1 string1, StringType2 string2, StringType3 string3, StringType4 string4, StringType5 string5, StringType6 string6)
 124 {
 125     PassRefPtr<UStringImpl> result = tryMakeString(string1, string2, string3, string4, string5, string6);
 126     if (!result)
 127         return throwOutOfMemoryError(exec);
 128     return jsNontrivialString(exec, result);
 129 }
 130
 131 }
 132
 133 #endif