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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/dom/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& exceptionState)
     36 {
     37     if (token.isEmpty()) {
     38         exceptionState.throwDOMException(SyntaxError, "The token provided must not be empty.");
     39         return false;
     40     }
     41 
     42     unsigned length = token.length();
     43     for (unsigned i = 0; i < length; ++i) {
     44         if (isHTMLSpace<UChar>(token[i])) {
     45             exceptionState.throwDOMException(InvalidCharacterError, "The token provided ('" + token + "') contains HTML space characters, which are not valid in tokens.");
     46             return false;
     47         }
     48     }
     49 
     50     return true;
     51 }
     52 
     53 bool DOMTokenList::validateTokens(const Vector<String>& tokens, ExceptionState& exceptionState)
     54 {
     55     for (size_t i = 0; i < tokens.size(); ++i) {
     56         if (!validateToken(tokens[i], exceptionState))
     57             return false;
     58     }
     59 
     60     return true;
     61 }
     62 
     63 bool DOMTokenList::contains(const AtomicString& token, ExceptionState& exceptionState) const
     64 {
     65     if (!validateToken(token, exceptionState))
     66         return false;
     67     return containsInternal(token);
     68 }
     69 
     70 void DOMTokenList::add(const AtomicString& token, ExceptionState& exceptionState)
     71 {
     72     Vector<String> tokens;
     73     tokens.append(token.string());
     74     add(tokens, exceptionState);
     75 }
     76 
     77 void DOMTokenList::add(const Vector<String>& tokens, ExceptionState& exceptionState)
     78 {
     79     Vector<String> filteredTokens;
     80     filteredTokens.reserveCapacity(tokens.size());
     81     for (size_t i = 0; i < tokens.size(); ++i) {
     82         if (!validateToken(tokens[i], exceptionState))
     83             return;
     84         if (containsInternal(tokens[i]))
     85             continue;
     86         if (filteredTokens.contains(tokens[i]))
     87             continue;
     88         filteredTokens.append(tokens[i]);
     89     }
     90 
     91     if (filteredTokens.isEmpty())
     92         return;
     93 
     94     setValue(addTokens(value(), filteredTokens));
     95 }
     96 
     97 void DOMTokenList::remove(const AtomicString& token, ExceptionState& exceptionState)
     98 {
     99     Vector<String> tokens;
    100     tokens.append(token.string());
    101     remove(tokens, exceptionState);
    102 }
    103 
    104 void DOMTokenList::remove(const Vector<String>& tokens, ExceptionState& exceptionState)
    105 {
    106     if (!validateTokens(tokens, exceptionState))
    107         return;
    108 
    109     // Check using containsInternal first since it is a lot faster than going
    110     // through the string character by character.
    111     bool found = false;
    112     for (size_t i = 0; i < tokens.size(); ++i) {
    113         if (containsInternal(tokens[i])) {
    114             found = true;
    115             break;
    116         }
    117     }
    118 
    119     if (found)
    120         setValue(removeTokens(value(), tokens));
    121 }
    122 
    123 bool DOMTokenList::toggle(const AtomicString& token, ExceptionState& exceptionState)
    124 {
    125     if (!validateToken(token, exceptionState))
    126         return false;
    127 
    128     if (containsInternal(token)) {
    129         removeInternal(token);
    130         return false;
    131     }
    132     addInternal(token);
    133     return true;
    134 }
    135 
    136 bool DOMTokenList::toggle(const AtomicString& token, bool force, ExceptionState& exceptionState)
    137 {
    138     if (!validateToken(token, exceptionState))
    139         return false;
    140 
    141     if (force)
    142         addInternal(token);
    143     else
    144         removeInternal(token);
    145 
    146     return force;
    147 }
    148 
    149 void DOMTokenList::addInternal(const AtomicString& token)
    150 {
    151     if (!containsInternal(token))
    152         setValue(addToken(value(), token));
    153 }
    154 
    155 void DOMTokenList::removeInternal(const AtomicString& token)
    156 {
    157     // Check using contains first since it uses AtomicString comparisons instead
    158     // of character by character testing.
    159     if (!containsInternal(token))
    160         return;
    161     setValue(removeToken(value(), token));
    162 }
    163 
    164 String DOMTokenList::addToken(const AtomicString& input, const AtomicString& token)
    165 {
    166     Vector<String> tokens;
    167     tokens.append(token.string());
    168     return addTokens(input, tokens);
    169 }
    170 
    171 String DOMTokenList::addTokens(const AtomicString& input, const Vector<String>& tokens)
    172 {
    173     bool needsSpace = false;
    174 
    175     StringBuilder builder;
    176     if (!input.isEmpty()) {
    177         builder.append(input);
    178         needsSpace = !isHTMLSpace<UChar>(input[input.length() - 1]);
    179     }
    180 
    181     for (size_t i = 0; i < tokens.size(); ++i) {
    182         if (needsSpace)
    183             builder.append(' ');
    184         builder.append(tokens[i]);
    185         needsSpace = true;
    186     }
    187 
    188     return builder.toString();
    189 }
    190 
    191 String DOMTokenList::removeToken(const AtomicString& input, const AtomicString& token)
    192 {
    193     Vector<String> tokens;
    194     tokens.append(token.string());
    195     return removeTokens(input, tokens);
    196 }
    197 
    198 String DOMTokenList::removeTokens(const AtomicString& input, const Vector<String>& tokens)
    199 {
    200     // Algorithm defined at http://www.whatwg.org/specs/web-apps/current-work/multipage/common-microsyntaxes.html#remove-a-token-from-a-string
    201     // New spec is at http://dom.spec.whatwg.org/#remove-a-token-from-a-string
    202 
    203     unsigned inputLength = input.length();
    204     StringBuilder output; // 3
    205     output.reserveCapacity(inputLength);
    206     unsigned position = 0; // 4
    207 
    208     // Step 5
    209     while (position < inputLength) {
    210         if (isHTMLSpace<UChar>(input[position])) { // 6
    211             output.append(input[position++]); // 6.1, 6.2
    212             continue; // 6.3
    213         }
    214 
    215         // Step 7
    216         StringBuilder tokenBuilder;
    217         while (position < inputLength && isNotHTMLSpace<UChar>(input[position]))
    218             tokenBuilder.append(input[position++]);
    219 
    220         // Step 8
    221         String token = tokenBuilder.toString();
    222         if (tokens.contains(token)) {
    223             // Step 8.1
    224             while (position < inputLength && isHTMLSpace<UChar>(input[position]))
    225                 ++position;
    226 
    227             // Step 8.2
    228             size_t j = output.length();
    229             while (j > 0 && isHTMLSpace<UChar>(output[j - 1]))
    230                 --j;
    231             output.resize(j);
    232 
    233             // Step 8.3
    234             if (position < inputLength && !output.isEmpty())
    235                 output.append(' ');
    236         } else {
    237             output.append(token); // Step 9
    238         }
    239     }
    240 
    241     return output.toString();
    242 }
    243 
    244 } // namespace WebCore
    245