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      1 /*
      2  * Copyright (C) 2010 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
      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'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     15  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     16  * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
     17  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     18  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     19  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
     20  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     21  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     22  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     23  */
     24 
     25 #include "config.h"
     26 #include "core/html/DOMTokenList.h"
     27 
     28 #include "bindings/v8/ExceptionState.h"
     29 #include "core/dom/ExceptionCode.h"
     30 #include "core/html/parser/HTMLParserIdioms.h"
     31 #include "wtf/text/StringBuilder.h"
     32 
     33 namespace WebCore {
     34 
     35 bool DOMTokenList::validateToken(const AtomicString& token, ExceptionState& es)
     36 {
     37     if (token.isEmpty()) {
     38         es.throwDOMException(SyntaxError);
     39         return false;
     40     }
     41 
     42     unsigned length = token.length();
     43     for (unsigned i = 0; i < length; ++i) {
     44         if (isHTMLSpace(token[i])) {
     45             es.throwDOMException(InvalidCharacterError);
     46             return false;
     47         }
     48     }
     49 
     50     return true;
     51 }
     52 
     53 bool DOMTokenList::validateTokens(const Vector<String>& tokens, ExceptionState& es)
     54 {
     55     for (size_t i = 0; i < tokens.size(); ++i) {
     56         if (!validateToken(tokens[i], es))
     57             return false;
     58     }
     59 
     60     return true;
     61 }
     62 
     63 bool DOMTokenList::contains(const AtomicString& token, ExceptionState& es) const
     64 {
     65     if (!validateToken(token, es))
     66         return false;
     67     return containsInternal(token);
     68 }
     69 
     70 void DOMTokenList::add(const AtomicString& token, ExceptionState& es)
     71 {
     72     Vector<String> tokens;
     73     tokens.append(token.string());
     74     add(tokens, es);
     75 }
     76 
     77 void DOMTokenList::add(const Vector<String>& tokens, ExceptionState& es)
     78 {
     79     Vector<String> filteredTokens;
     80     for (size_t i = 0; i < tokens.size(); ++i) {
     81         if (!validateToken(tokens[i], es))
     82             return;
     83         if (!containsInternal(tokens[i]))
     84             filteredTokens.append(tokens[i]);
     85     }
     86 
     87     if (filteredTokens.isEmpty())
     88         return;
     89 
     90     setValue(addTokens(value(), filteredTokens));
     91 }
     92 
     93 void DOMTokenList::remove(const AtomicString& token, ExceptionState& es)
     94 {
     95     Vector<String> tokens;
     96     tokens.append(token.string());
     97     remove(tokens, es);
     98 }
     99 
    100 void DOMTokenList::remove(const Vector<String>& tokens, ExceptionState& es)
    101 {
    102     if (!validateTokens(tokens, es))
    103         return;
    104 
    105     // Check using containsInternal first since it is a lot faster than going
    106     // through the string character by character.
    107     bool found = false;
    108     for (size_t i = 0; i < tokens.size(); ++i) {
    109         if (containsInternal(tokens[i])) {
    110             found = true;
    111             break;
    112         }
    113     }
    114 
    115     if (found)
    116         setValue(removeTokens(value(), tokens));
    117 }
    118 
    119 bool DOMTokenList::toggle(const AtomicString& token, ExceptionState& es)
    120 {
    121     if (!validateToken(token, es))
    122         return false;
    123 
    124     if (containsInternal(token)) {
    125         removeInternal(token);
    126         return false;
    127     }
    128     addInternal(token);
    129     return true;
    130 }
    131 
    132 bool DOMTokenList::toggle(const AtomicString& token, bool force, ExceptionState& es)
    133 {
    134     if (!validateToken(token, es))
    135         return false;
    136 
    137     if (force)
    138         addInternal(token);
    139     else
    140         removeInternal(token);
    141 
    142     return force;
    143 }
    144 
    145 void DOMTokenList::addInternal(const AtomicString& token)
    146 {
    147     if (!containsInternal(token))
    148         setValue(addToken(value(), token));
    149 }
    150 
    151 void DOMTokenList::removeInternal(const AtomicString& token)
    152 {
    153     // Check using contains first since it uses AtomicString comparisons instead
    154     // of character by character testing.
    155     if (!containsInternal(token))
    156         return;
    157     setValue(removeToken(value(), token));
    158 }
    159 
    160 String DOMTokenList::addToken(const AtomicString& input, const AtomicString& token)
    161 {
    162     Vector<String> tokens;
    163     tokens.append(token.string());
    164     return addTokens(input, tokens);
    165 }
    166 
    167 String DOMTokenList::addTokens(const AtomicString& input, const Vector<String>& tokens)
    168 {
    169     bool needsSpace = false;
    170 
    171     StringBuilder builder;
    172     if (!input.isEmpty()) {
    173         builder.append(input);
    174         needsSpace = !isHTMLSpace(input[input.length() - 1]);
    175     }
    176 
    177     for (size_t i = 0; i < tokens.size(); ++i) {
    178         if (needsSpace)
    179             builder.append(' ');
    180         builder.append(tokens[i]);
    181         needsSpace = true;
    182     }
    183 
    184     return builder.toString();
    185 }
    186 
    187 String DOMTokenList::removeToken(const AtomicString& input, const AtomicString& token)
    188 {
    189     Vector<String> tokens;
    190     tokens.append(token.string());
    191     return removeTokens(input, tokens);
    192 }
    193 
    194 String DOMTokenList::removeTokens(const AtomicString& input, const Vector<String>& tokens)
    195 {
    196     // Algorithm defined at http://www.whatwg.org/specs/web-apps/current-work/multipage/common-microsyntaxes.html#remove-a-token-from-a-string
    197     // New spec is at http://dom.spec.whatwg.org/#remove-a-token-from-a-string
    198 
    199     unsigned inputLength = input.length();
    200     StringBuilder output; // 3
    201     output.reserveCapacity(inputLength);
    202     unsigned position = 0; // 4
    203 
    204     // Step 5
    205     while (position < inputLength) {
    206         if (isHTMLSpace(input[position])) { // 6
    207             output.append(input[position++]); // 6.1, 6.2
    208             continue; // 6.3
    209         }
    210 
    211         // Step 7
    212         StringBuilder tokenBuilder;
    213         while (position < inputLength && isNotHTMLSpace(input[position]))
    214             tokenBuilder.append(input[position++]);
    215 
    216         // Step 8
    217         String token = tokenBuilder.toString();
    218         if (tokens.contains(token)) {
    219             // Step 8.1
    220             while (position < inputLength && isHTMLSpace(input[position]))
    221                 ++position;
    222 
    223             // Step 8.2
    224             size_t j = output.length();
    225             while (j > 0 && isHTMLSpace(output[j - 1]))
    226                 --j;
    227             output.resize(j);
    228 
    229             // Step 8.3
    230             if (position < inputLength && !output.isEmpty())
    231                 output.append(' ');
    232         } else {
    233             output.append(token); // Step 9
    234         }
    235     }
    236 
    237     return output.toString();
    238 }
    239 
    240 } // namespace WebCore
    241