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
validateToken(const AtomicString & token,ExceptionState & exceptionState)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
validateTokens(const Vector<String> & tokens,ExceptionState & exceptionState)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
contains(const AtomicString & token,ExceptionState & exceptionState) const63 bool DOMTokenList::contains(const AtomicString& token, ExceptionState& exceptionState) const
64 {
65 if (!validateToken(token, exceptionState))
66 return false;
67 return containsInternal(token);
68 }
69
add(const AtomicString & token,ExceptionState & exceptionState)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
add(const Vector<String> & tokens,ExceptionState & exceptionState)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
remove(const AtomicString & token,ExceptionState & exceptionState)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
remove(const Vector<String> & tokens,ExceptionState & exceptionState)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
toggle(const AtomicString & token,ExceptionState & exceptionState)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
toggle(const AtomicString & token,bool force,ExceptionState & exceptionState)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
addInternal(const AtomicString & token)149 void DOMTokenList::addInternal(const AtomicString& token)
150 {
151 if (!containsInternal(token))
152 setValue(addToken(value(), token));
153 }
154
removeInternal(const AtomicString & token)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
addToken(const AtomicString & input,const AtomicString & token)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
addTokens(const AtomicString & input,const Vector<String> & tokens)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
removeToken(const AtomicString & input,const AtomicString & token)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
removeTokens(const AtomicString & input,const Vector<String> & tokens)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