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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 template<typename CharType1, typename CharType2>
     74 static bool propertyNameMatchesAttributeName(const CharType1* propertyName, const CharType2* attributeName, unsigned propertyLength, unsigned attributeLength)
     75 {
     76     unsigned a = 5;
     77     unsigned p = 0;
     78     bool wordBoundary = false;
     79     while (a < attributeLength && p < propertyLength) {
     80         if (attributeName[a] == '-' && a + 1 < attributeLength && isASCIILower(attributeName[a + 1]))
     81             wordBoundary = true;
     82         else {
     83             if ((wordBoundary ? toASCIIUpper(attributeName[a]) : attributeName[a]) != propertyName[p])
     84                 return false;
     85             p++;
     86             wordBoundary = false;
     87         }
     88         a++;
     89     }
     90 
     91     return (a == attributeLength && p == propertyLength);
     92 }
     93 
     94 static bool propertyNameMatchesAttributeName(const String& propertyName, const String& attributeName)
     95 {
     96     if (!attributeName.startsWith("data-"))
     97         return false;
     98 
     99     unsigned propertyLength = propertyName.length();
    100     unsigned attributeLength = attributeName.length();
    101 
    102     if (propertyName.is8Bit()) {
    103         if (attributeName.is8Bit())
    104             return propertyNameMatchesAttributeName(propertyName.characters8(), attributeName.characters8(), propertyLength, attributeLength);
    105         return propertyNameMatchesAttributeName(propertyName.characters8(), attributeName.characters16(), propertyLength, attributeLength);
    106     }
    107 
    108     if (attributeName.is8Bit())
    109         return propertyNameMatchesAttributeName(propertyName.characters16(), attributeName.characters8(), propertyLength, attributeLength);
    110     return propertyNameMatchesAttributeName(propertyName.characters16(), attributeName.characters16(), propertyLength, attributeLength);
    111 }
    112 
    113 static bool isValidPropertyName(const String& name)
    114 {
    115     unsigned length = name.length();
    116     for (unsigned i = 0; i < length; ++i) {
    117         if (name[i] == '-' && (i + 1 < length) && isASCIILower(name[i + 1]))
    118             return false;
    119     }
    120     return true;
    121 }
    122 
    123 // This returns an AtomicString because attribute names are always stored
    124 // as AtomicString types in Element (see setAttribute()).
    125 static AtomicString convertPropertyNameToAttributeName(const String& name)
    126 {
    127     StringBuilder builder;
    128     builder.append("data-");
    129 
    130     unsigned length = name.length();
    131     for (unsigned i = 0; i < length; ++i) {
    132         UChar character = name[i];
    133         if (isASCIIUpper(character)) {
    134             builder.append('-');
    135             builder.append(toASCIILower(character));
    136         } else
    137             builder.append(character);
    138     }
    139 
    140     return builder.toAtomicString();
    141 }
    142 
    143 #if !ENABLE(OILPAN)
    144 void DatasetDOMStringMap::ref()
    145 {
    146     m_element->ref();
    147 }
    148 
    149 void DatasetDOMStringMap::deref()
    150 {
    151     m_element->deref();
    152 }
    153 #endif
    154 
    155 void DatasetDOMStringMap::getNames(Vector<String>& names)
    156 {
    157     if (!m_element->hasAttributes())
    158         return;
    159 
    160     AttributeCollection attributes = m_element->attributes();
    161     AttributeCollection::const_iterator end = attributes.end();
    162     for (AttributeCollection::const_iterator it = attributes.begin(); it != end; ++it) {
    163         if (isValidAttributeName(it->localName()))
    164             names.append(convertAttributeNameToPropertyName(it->localName()));
    165     }
    166 }
    167 
    168 String DatasetDOMStringMap::item(const String& name)
    169 {
    170     if (!m_element->hasAttributes())
    171         return String();
    172 
    173     AttributeCollection attributes = m_element->attributes();
    174     AttributeCollection::const_iterator end = attributes.end();
    175     for (AttributeCollection::const_iterator it = attributes.begin(); it != end; ++it) {
    176         if (propertyNameMatchesAttributeName(name, it->localName()))
    177             return it->value();
    178     }
    179 
    180     return String();
    181 }
    182 
    183 bool DatasetDOMStringMap::contains(const String& name)
    184 {
    185     if (!m_element->hasAttributes())
    186         return false;
    187 
    188     AttributeCollection attributes = m_element->attributes();
    189     AttributeCollection::const_iterator end = attributes.end();
    190     for (AttributeCollection::const_iterator it = attributes.begin(); it != end; ++it) {
    191         if (propertyNameMatchesAttributeName(name, it->localName()))
    192             return true;
    193     }
    194     return false;
    195 }
    196 
    197 void DatasetDOMStringMap::setItem(const String& name, const String& value, ExceptionState& exceptionState)
    198 {
    199     if (!isValidPropertyName(name)) {
    200         exceptionState.throwDOMException(SyntaxError, "'" + name + "' is not a valid property name.");
    201         return;
    202     }
    203 
    204     m_element->setAttribute(convertPropertyNameToAttributeName(name), AtomicString(value), exceptionState);
    205 }
    206 
    207 bool DatasetDOMStringMap::deleteItem(const String& name)
    208 {
    209     if (isValidPropertyName(name)) {
    210         AtomicString attributeName = convertPropertyNameToAttributeName(name);
    211         if (m_element->hasAttribute(attributeName)) {
    212             m_element->removeAttribute(attributeName);
    213             return true;
    214         }
    215     }
    216     return false;
    217 }
    218 
    219 void DatasetDOMStringMap::trace(Visitor* visitor)
    220 {
    221     visitor->trace(m_element);
    222     DOMStringMap::trace(visitor);
    223 }
    224 
    225 } // namespace WebCore
    226