| /* |
| * Copyright (C) 2008, 2010 Apple Inc. All Rights Reserved. |
| * Copyright (C) 2009 Torch Mobile, Inc. http://www.torchmobile.com/ |
| * Copyright (C) 2010 Google Inc. All Rights Reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "core/html/parser/CSSPreloadScanner.h" |
| |
| #include "core/fetch/FetchInitiatorTypeNames.h" |
| #include "core/html/parser/HTMLParserIdioms.h" |
| #include "platform/text/SegmentedString.h" |
| #include <memory> |
| |
| namespace blink { |
| |
| CSSPreloadScanner::CSSPreloadScanner() |
| { |
| } |
| |
| CSSPreloadScanner::~CSSPreloadScanner() |
| { |
| } |
| |
| void CSSPreloadScanner::reset() |
| { |
| m_state = Initial; |
| m_rule.clear(); |
| m_ruleValue.clear(); |
| } |
| |
| template<typename Char> |
| void CSSPreloadScanner::scanCommon(const Char* begin, const Char* end, const SegmentedString& source, PreloadRequestStream& requests, const KURL& predictedBaseElementURL) |
| { |
| m_requests = &requests; |
| m_predictedBaseElementURL = &predictedBaseElementURL; |
| |
| for (const Char* it = begin; it != end && m_state != DoneParsingImportRules; ++it) |
| tokenize(*it, source); |
| |
| m_requests = nullptr; |
| m_predictedBaseElementURL = nullptr; |
| } |
| |
| void CSSPreloadScanner::scan(const HTMLToken::DataVector& data, const SegmentedString& source, PreloadRequestStream& requests, const KURL& predictedBaseElementURL) |
| { |
| scanCommon(data.data(), data.data() + data.size(), source, requests, predictedBaseElementURL); |
| } |
| |
| void CSSPreloadScanner::scan(const String& tagName, const SegmentedString& source, PreloadRequestStream& requests, const KURL& predictedBaseElementURL) |
| { |
| if (tagName.is8Bit()) { |
| const LChar* begin = tagName.characters8(); |
| scanCommon(begin, begin + tagName.length(), source, requests, predictedBaseElementURL); |
| return; |
| } |
| const UChar* begin = tagName.characters16(); |
| scanCommon(begin, begin + tagName.length(), source, requests, predictedBaseElementURL); |
| } |
| |
| void CSSPreloadScanner::setReferrerPolicy(const ReferrerPolicy policy) |
| { |
| m_referrerPolicy = policy; |
| } |
| |
| inline void CSSPreloadScanner::tokenize(UChar c, const SegmentedString& source) |
| { |
| // We are just interested in @import rules, no need for real tokenization here |
| // Searching for other types of resources is probably low payoff. |
| switch (m_state) { |
| case Initial: |
| if (isHTMLSpace<UChar>(c)) |
| break; |
| if (c == '@') |
| m_state = RuleStart; |
| else if (c == '/') |
| m_state = MaybeComment; |
| else |
| m_state = DoneParsingImportRules; |
| break; |
| case MaybeComment: |
| if (c == '*') |
| m_state = Comment; |
| else |
| m_state = Initial; |
| break; |
| case Comment: |
| if (c == '*') |
| m_state = MaybeCommentEnd; |
| break; |
| case MaybeCommentEnd: |
| if (c == '*') |
| break; |
| if (c == '/') |
| m_state = Initial; |
| else |
| m_state = Comment; |
| break; |
| case RuleStart: |
| if ((c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z')) { |
| m_rule.clear(); |
| m_ruleValue.clear(); |
| m_rule.append(c); |
| m_state = Rule; |
| } else |
| m_state = Initial; |
| break; |
| case Rule: |
| if (isHTMLSpace<UChar>(c)) |
| m_state = AfterRule; |
| else if (c == ';') |
| m_state = Initial; |
| else |
| m_rule.append(c); |
| break; |
| case AfterRule: |
| if (isHTMLSpace<UChar>(c)) |
| break; |
| if (c == ';') |
| m_state = Initial; |
| else if (c == '{') |
| m_state = DoneParsingImportRules; |
| else { |
| m_state = RuleValue; |
| m_ruleValue.append(c); |
| } |
| break; |
| case RuleValue: |
| if (isHTMLSpace<UChar>(c)) |
| m_state = AfterRuleValue; |
| else if (c == ';') |
| emitRule(source); |
| else |
| m_ruleValue.append(c); |
| break; |
| case AfterRuleValue: |
| if (isHTMLSpace<UChar>(c)) |
| break; |
| if (c == ';') |
| emitRule(source); |
| else if (c == '{') |
| m_state = DoneParsingImportRules; |
| else { |
| // FIXME: media rules |
| m_state = Initial; |
| } |
| break; |
| case DoneParsingImportRules: |
| ASSERT_NOT_REACHED(); |
| break; |
| } |
| } |
| |
| static String parseCSSStringOrURL(const String& string) |
| { |
| size_t offset = 0; |
| size_t reducedLength = string.length(); |
| |
| while (reducedLength && isHTMLSpace<UChar>(string[offset])) { |
| ++offset; |
| --reducedLength; |
| } |
| while (reducedLength && isHTMLSpace<UChar>(string[offset + reducedLength - 1])) |
| --reducedLength; |
| |
| if (reducedLength >= 5 |
| && (string[offset] == 'u' || string[offset] == 'U') |
| && (string[offset + 1] == 'r' || string[offset + 1] == 'R') |
| && (string[offset + 2] == 'l' || string[offset + 2] == 'L') |
| && string[offset + 3] == '(' |
| && string[offset + reducedLength - 1] == ')') { |
| offset += 4; |
| reducedLength -= 5; |
| } |
| |
| while (reducedLength && isHTMLSpace<UChar>(string[offset])) { |
| ++offset; |
| --reducedLength; |
| } |
| while (reducedLength && isHTMLSpace<UChar>(string[offset + reducedLength - 1])) |
| --reducedLength; |
| |
| if (reducedLength < 2 || string[offset] != string[offset + reducedLength - 1] || !(string[offset] == '\'' || string[offset] == '"')) |
| return String(); |
| offset++; |
| reducedLength -= 2; |
| |
| while (reducedLength && isHTMLSpace<UChar>(string[offset])) { |
| ++offset; |
| --reducedLength; |
| } |
| while (reducedLength && isHTMLSpace<UChar>(string[offset + reducedLength - 1])) |
| --reducedLength; |
| |
| return string.substring(offset, reducedLength); |
| } |
| |
| void CSSPreloadScanner::emitRule(const SegmentedString& source) |
| { |
| if (equalIgnoringCase(m_rule, "import")) { |
| String url = parseCSSStringOrURL(m_ruleValue.toString()); |
| if (!url.isEmpty()) { |
| TextPosition position = TextPosition(source.currentLine(), source.currentColumn()); |
| std::unique_ptr<PreloadRequest> request = PreloadRequest::create(FetchInitiatorTypeNames::css, position, url, *m_predictedBaseElementURL, Resource::CSSStyleSheet, m_referrerPolicy); |
| // FIXME: Should this be including the charset in the preload request? |
| m_requests->append(std::move(request)); |
| } |
| m_state = Initial; |
| } else if (equalIgnoringCase(m_rule, "charset")) |
| m_state = Initial; |
| else |
| m_state = DoneParsingImportRules; |
| m_rule.clear(); |
| m_ruleValue.clear(); |
| } |
| |
| } // namespace blink |
