| /* |
| * Copyright (C) 2011 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: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * 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. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "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 THE COPYRIGHT |
| * OWNER 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. |
| */ |
| |
| #ifndef WebVTTTokenizer_h |
| #define WebVTTTokenizer_h |
| |
| #include "core/html/parser/InputStreamPreprocessor.h" |
| #include "core/html/track/WebVTTToken.h" |
| #include "wtf/PassOwnPtr.h" |
| |
| namespace WebCore { |
| |
| class WebVTTTokenizerState { |
| public: |
| enum State { |
| DataState, |
| EscapeState, |
| TagState, |
| StartTagState, |
| StartTagClassState, |
| StartTagAnnotationState, |
| EndTagState, |
| EndTagOpenState, |
| TimestampTagState, |
| }; |
| }; |
| |
| class WebVTTTokenizer { |
| WTF_MAKE_NONCOPYABLE(WebVTTTokenizer); |
| WTF_MAKE_FAST_ALLOCATED; |
| public: |
| static PassOwnPtr<WebVTTTokenizer> create() { return adoptPtr(new WebVTTTokenizer); } |
| |
| typedef WebVTTTokenizerState State; |
| |
| void reset(); |
| |
| bool nextToken(SegmentedString&, WebVTTToken&); |
| |
| inline bool haveBufferedCharacterToken() |
| { |
| return m_token->type() == WebVTTToken::Type::Character; |
| } |
| |
| inline void bufferCharacter(UChar character) |
| { |
| ASSERT(character != kEndOfFileMarker); |
| m_token->ensureIsCharacterToken(); |
| m_token->appendToCharacter(character); |
| } |
| |
| inline bool emitAndResumeIn(SegmentedString& source, State::State state) |
| { |
| m_state = state; |
| source.advanceAndUpdateLineNumber(); |
| return true; |
| } |
| |
| inline bool emitEndOfFile(SegmentedString& source) |
| { |
| if (haveBufferedCharacterToken()) |
| return true; |
| m_state = State::DataState; |
| source.advanceAndUpdateLineNumber(); |
| m_token->clear(); |
| m_token->makeEndOfFile(); |
| return true; |
| } |
| |
| bool shouldSkipNullCharacters() const { return true; } |
| |
| private: |
| WebVTTTokenizer(); |
| |
| // m_token is owned by the caller. If nextToken is not on the stack, |
| // this member might be pointing to unallocated memory. |
| WebVTTToken* m_token; |
| WebVTTTokenizerState::State m_state; |
| |
| Vector<LChar, 32> m_buffer; |
| |
| // ://www.whatwg.org/specs/web-apps/current-work/#preprocessing-the-input-stream |
| InputStreamPreprocessor<WebVTTTokenizer> m_inputStreamPreprocessor; |
| }; |
| |
| } |
| |
| #endif |