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      1 /*
      2  * Copyright (C) 2010 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. AND ITS CONTRIBUTORS ``AS IS''
     14  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
     15  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
     17  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     18  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     19  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     20  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     21  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     22  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
     23  * THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #include "config.h"
     27 #include "core/dom/DatasetDOMStringMap.h"
     28 
     29 #include "bindings/v8/ExceptionState.h"
     30 #include "core/dom/Attribute.h"
     31 #include "core/dom/Element.h"
     32 #include "core/dom/ExceptionCode.h"
     33 #include "wtf/ASCIICType.h"
     34 #include "wtf/text/StringBuilder.h"
     35 
     36 namespace WebCore {
     37 
     38 static bool isValidAttributeName(const String& name)
     39 {
     40     if (!name.startsWith("data-"))
     41         return false;
     42 
     43     unsigned length = name.length();
     44     for (unsigned i = 5; i < length; ++i) {
     45         if (isASCIIUpper(name[i]))
     46             return false;
     47     }
     48 
     49     return true;
     50 }
     51 
     52 static String convertAttributeNameToPropertyName(const String& name)
     53 {
     54     StringBuilder stringBuilder;
     55 
     56     unsigned length = name.length();
     57     for (unsigned i = 5; i < length; ++i) {
     58         UChar character = name[i];
     59         if (character != '-')
     60             stringBuilder.append(character);
     61         else {
     62             if ((i + 1 < length) && isASCIILower(name[i + 1])) {
     63                 stringBuilder.append(toASCIIUpper(name[i + 1]));
     64                 ++i;
     65             } else
     66                 stringBuilder.append(character);
     67         }
     68     }
     69 
     70     return stringBuilder.toString();
     71 }
     72 
     73 static bool propertyNameMatchesAttributeName(const String& propertyName, const String& attributeName)
     74 {
     75     if (!attributeName.startsWith("data-"))
     76         return false;
     77 
     78     unsigned propertyLength = propertyName.length();
     79     unsigned attributeLength = attributeName.length();
     80 
     81     unsigned a = 5;
     82     unsigned p = 0;
     83     bool wordBoundary = false;
     84     while (a < attributeLength && p < propertyLength) {
     85         if (attributeName[a] == '-' && a + 1 < attributeLength && attributeName[a + 1] != '-')
     86             wordBoundary = true;
     87         else {
     88             if ((wordBoundary ? toASCIIUpper(attributeName[a]) : attributeName[a]) != propertyName[p])
     89                 return false;
     90             p++;
     91             wordBoundary = false;
     92         }
     93         a++;
     94     }
     95 
     96     return (a == attributeLength && p == propertyLength);
     97 }
     98 
     99 static bool isValidPropertyName(const String& name)
    100 {
    101     unsigned length = name.length();
    102     for (unsigned i = 0; i < length; ++i) {
    103         if (name[i] == '-' && (i + 1 < length) && isASCIILower(name[i + 1]))
    104             return false;
    105     }
    106     return true;
    107 }
    108 
    109 static String convertPropertyNameToAttributeName(const String& name)
    110 {
    111     StringBuilder builder;
    112     builder.append("data-");
    113 
    114     unsigned length = name.length();
    115     for (unsigned i = 0; i < length; ++i) {
    116         UChar character = name[i];
    117         if (isASCIIUpper(character)) {
    118             builder.append('-');
    119             builder.append(toASCIILower(character));
    120         } else
    121             builder.append(character);
    122     }
    123 
    124     return builder.toString();
    125 }
    126 
    127 void DatasetDOMStringMap::ref()
    128 {
    129     m_element->ref();
    130 }
    131 
    132 void DatasetDOMStringMap::deref()
    133 {
    134     m_element->deref();
    135 }
    136 
    137 void DatasetDOMStringMap::getNames(Vector<String>& names)
    138 {
    139     if (!m_element->hasAttributes())
    140         return;
    141 
    142     unsigned length = m_element->attributeCount();
    143     for (unsigned i = 0; i < length; i++) {
    144         const Attribute* attribute = m_element->attributeItem(i);
    145         if (isValidAttributeName(attribute->localName()))
    146             names.append(convertAttributeNameToPropertyName(attribute->localName()));
    147     }
    148 }
    149 
    150 String DatasetDOMStringMap::item(const String& name)
    151 {
    152     if (!m_element->hasAttributes())
    153         return String();
    154 
    155     unsigned length = m_element->attributeCount();
    156     for (unsigned i = 0; i < length; i++) {
    157         const Attribute* attribute = m_element->attributeItem(i);
    158         if (propertyNameMatchesAttributeName(name, attribute->localName()))
    159             return attribute->value();
    160     }
    161 
    162     return String();
    163 }
    164 
    165 bool DatasetDOMStringMap::contains(const String& name)
    166 {
    167     if (!m_element->hasAttributes())
    168         return false;
    169 
    170     unsigned length = m_element->attributeCount();
    171     for (unsigned i = 0; i < length; i++) {
    172         const Attribute* attribute = m_element->attributeItem(i);
    173         if (propertyNameMatchesAttributeName(name, attribute->localName()))
    174             return true;
    175     }
    176 
    177     return false;
    178 }
    179 
    180 void DatasetDOMStringMap::setItem(const String& name, const String& value, ExceptionState& es)
    181 {
    182     if (!isValidPropertyName(name)) {
    183         es.throwDOMException(SyntaxError);
    184         return;
    185     }
    186 
    187     m_element->setAttribute(convertPropertyNameToAttributeName(name), value, es);
    188 }
    189 
    190 void DatasetDOMStringMap::deleteItem(const String& name, ExceptionState& es)
    191 {
    192     if (!isValidPropertyName(name)) {
    193         es.throwDOMException(SyntaxError);
    194         return;
    195     }
    196 
    197     m_element->removeAttribute(convertPropertyNameToAttributeName(name));
    198 }
    199 
    200 } // namespace WebCore
    201