1 /* 2 * Copyright (C) 2008, 2010 Apple Inc. All Rights Reserved. 3 * Copyright (C) 2009 Torch Mobile, Inc. http://www.torchmobile.com/ 4 * Copyright (C) 2010 Google Inc. All Rights Reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY 16 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 18 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR 19 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 20 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 22 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 23 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 25 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include "config.h" 29 #include "core/html/parser/CSSPreloadScanner.h" 30 31 #include "FetchInitiatorTypeNames.h" 32 #include "core/html/parser/HTMLIdentifier.h" 33 #include "core/html/parser/HTMLParserIdioms.h" 34 #include "core/platform/text/SegmentedString.h" 35 36 namespace WebCore { 37 38 CSSPreloadScanner::CSSPreloadScanner() 39 : m_state(Initial) 40 , m_requests(0) 41 { 42 } 43 44 CSSPreloadScanner::~CSSPreloadScanner() 45 { 46 } 47 48 void CSSPreloadScanner::reset() 49 { 50 m_state = Initial; 51 m_rule.clear(); 52 m_ruleValue.clear(); 53 } 54 55 template<typename Char> 56 void CSSPreloadScanner::scanCommon(const Char* begin, const Char* end, const SegmentedString& source, PreloadRequestStream& requests) 57 { 58 m_requests = &requests; 59 for (const Char* it = begin; it != end && m_state != DoneParsingImportRules; ++it) 60 tokenize(*it, source); 61 m_requests = 0; 62 } 63 64 void CSSPreloadScanner::scan(const HTMLToken::DataVector& data, const SegmentedString& source, PreloadRequestStream& requests) 65 { 66 scanCommon(data.data(), data.data() + data.size(), source, requests); 67 } 68 69 void CSSPreloadScanner::scan(const HTMLIdentifier& identifier, const SegmentedString& source, PreloadRequestStream& requests) 70 { 71 const StringImpl* data = identifier.asStringImpl(); 72 if (data->is8Bit()) { 73 const LChar* begin = data->characters8(); 74 scanCommon(begin, begin + data->length(), source, requests); 75 return; 76 } 77 const UChar* begin = data->characters16(); 78 scanCommon(begin, begin + data->length(), source, requests); 79 } 80 81 inline void CSSPreloadScanner::tokenize(UChar c, const SegmentedString& source) 82 { 83 // We are just interested in @import rules, no need for real tokenization here 84 // Searching for other types of resources is probably low payoff. 85 switch (m_state) { 86 case Initial: 87 if (isHTMLSpace(c)) 88 break; 89 if (c == '@') 90 m_state = RuleStart; 91 else if (c == '/') 92 m_state = MaybeComment; 93 else 94 m_state = DoneParsingImportRules; 95 break; 96 case MaybeComment: 97 if (c == '*') 98 m_state = Comment; 99 else 100 m_state = Initial; 101 break; 102 case Comment: 103 if (c == '*') 104 m_state = MaybeCommentEnd; 105 break; 106 case MaybeCommentEnd: 107 if (c == '*') 108 break; 109 if (c == '/') 110 m_state = Initial; 111 else 112 m_state = Comment; 113 break; 114 case RuleStart: 115 if ((c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z')) { 116 m_rule.clear(); 117 m_ruleValue.clear(); 118 m_rule.append(c); 119 m_state = Rule; 120 } else 121 m_state = Initial; 122 break; 123 case Rule: 124 if (isHTMLSpace(c)) 125 m_state = AfterRule; 126 else if (c == ';') 127 m_state = Initial; 128 else 129 m_rule.append(c); 130 break; 131 case AfterRule: 132 if (isHTMLSpace(c)) 133 break; 134 if (c == ';') 135 m_state = Initial; 136 else if (c == '{') 137 m_state = DoneParsingImportRules; 138 else { 139 m_state = RuleValue; 140 m_ruleValue.append(c); 141 } 142 break; 143 case RuleValue: 144 if (isHTMLSpace(c)) 145 m_state = AfterRuleValue; 146 else if (c == ';') 147 emitRule(source); 148 else 149 m_ruleValue.append(c); 150 break; 151 case AfterRuleValue: 152 if (isHTMLSpace(c)) 153 break; 154 if (c == ';') 155 emitRule(source); 156 else if (c == '{') 157 m_state = DoneParsingImportRules; 158 else { 159 // FIXME: media rules 160 m_state = Initial; 161 } 162 break; 163 case DoneParsingImportRules: 164 ASSERT_NOT_REACHED(); 165 break; 166 } 167 } 168 169 static String parseCSSStringOrURL(const String& string) 170 { 171 size_t offset = 0; 172 size_t reducedLength = string.length(); 173 174 while (reducedLength && isHTMLSpace(string[offset])) { 175 ++offset; 176 --reducedLength; 177 } 178 while (reducedLength && isHTMLSpace(string[offset + reducedLength - 1])) 179 --reducedLength; 180 181 if (reducedLength >= 5 182 && (string[offset] == 'u' || string[offset] == 'U') 183 && (string[offset + 1] == 'r' || string[offset + 1] == 'R') 184 && (string[offset + 2] == 'l' || string[offset + 2] == 'L') 185 && string[offset + 3] == '(' 186 && string[offset + reducedLength - 1] == ')') { 187 offset += 4; 188 reducedLength -= 5; 189 } 190 191 while (reducedLength && isHTMLSpace(string[offset])) { 192 ++offset; 193 --reducedLength; 194 } 195 while (reducedLength && isHTMLSpace(string[offset + reducedLength - 1])) 196 --reducedLength; 197 198 if (reducedLength < 2 || string[offset] != string[offset + reducedLength - 1] || !(string[offset] == '\'' || string[offset] == '"')) 199 return String(); 200 offset++; 201 reducedLength -= 2; 202 203 while (reducedLength && isHTMLSpace(string[offset])) { 204 ++offset; 205 --reducedLength; 206 } 207 while (reducedLength && isHTMLSpace(string[offset + reducedLength - 1])) 208 --reducedLength; 209 210 return string.substring(offset, reducedLength); 211 } 212 213 void CSSPreloadScanner::emitRule(const SegmentedString& source) 214 { 215 if (equalIgnoringCase(m_rule, "import")) { 216 String url = parseCSSStringOrURL(m_ruleValue.toString()); 217 if (!url.isEmpty()) { 218 KURL baseElementURL; // FIXME: This should be passed in from the HTMLPreloadScaner via scan()! 219 TextPosition position = TextPosition(source.currentLine(), source.currentColumn()); 220 OwnPtr<PreloadRequest> request = PreloadRequest::create(FetchInitiatorTypeNames::css, position, url, baseElementURL, Resource::CSSStyleSheet); 221 // FIXME: Should this be including the charset in the preload request? 222 m_requests->append(request.release()); 223 } 224 m_state = Initial; 225 } else if (equalIgnoringCase(m_rule, "charset")) 226 m_state = Initial; 227 else 228 m_state = DoneParsingImportRules; 229 m_rule.clear(); 230 m_ruleValue.clear(); 231 } 232 233 } 234
