1 /* 2 * Copyright (C) 2013, Opera Software ASA. 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 are 6 * met: 7 * 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above 11 * copyright notice, this list of conditions and the following disclaimer 12 * in the documentation and/or other materials provided with the 13 * distribution. 14 * * Neither the name of Google Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived from 16 * this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #ifndef BufferedLineReader_h 32 #define BufferedLineReader_h 33 34 #include "platform/text/SegmentedString.h" 35 #include "wtf/text/StringBuilder.h" 36 37 namespace WebCore { 38 39 // Line collection helper for the WebVTT Parser. 40 // 41 // Converts a stream of data (== a sequence of Strings) into a set of 42 // lines. CR, LR or CRLF are considered linebreaks. Normalizes NULs (U+0000) 43 // to 'REPLACEMENT CHARACTER' (U+FFFD) and does not return the linebreaks as 44 // part of the result. 45 class BufferedLineReader { 46 WTF_MAKE_NONCOPYABLE(BufferedLineReader); 47 public: BufferedLineReader()48 BufferedLineReader() 49 : m_endOfStream(false) 50 , m_maybeSkipLF(false) { } 51 52 // Append data to the internal buffer. append(const String & data)53 void append(const String& data) 54 { 55 ASSERT(!m_endOfStream); 56 m_buffer.append(SegmentedString(data)); 57 } 58 59 // Indicate that no more data will be appended. This will cause any 60 // potentially "unterminated" line to be returned from getLine. setEndOfStream()61 void setEndOfStream() { m_endOfStream = true; } 62 63 // Attempt to read a line from the internal buffer (fed via append). 64 // If successful, true is returned and |line| is set to the line that was 65 // read. If no line could be read false is returned. 66 bool getLine(String& line); 67 68 // Returns true if EOS has been reached proper. isAtEndOfStream()69 bool isAtEndOfStream() const { return m_endOfStream && m_buffer.isEmpty(); } 70 71 private: 72 // Consume the next character the buffer if it is the character |c|. scanCharacter(UChar c)73 void scanCharacter(UChar c) 74 { 75 ASSERT(!m_buffer.isEmpty()); 76 if (m_buffer.currentChar() == c) 77 m_buffer.advance(); 78 } 79 80 SegmentedString m_buffer; 81 StringBuilder m_lineBuffer; 82 bool m_endOfStream; 83 bool m_maybeSkipLF; 84 }; 85 86 } // namespace WebCore 87 88 #endif 89