1 /* 2 * Copyright (c) 2015, Intel Corporation 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are met: 6 * 7 * * Redistributions of source code must retain the above copyright notice, 8 * this list of conditions and the following disclaimer. 9 * * 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 * * Neither the name of Intel Corporation nor the names of its contributors 13 * may be used to endorse or promote products derived from this software 14 * without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 /** \file 30 * \brief Boundary assertions (^, $, \\A, \\Z, \\z) 31 */ 32 33 #ifndef _RE_COMPONENTBOUNDARY_H_ 34 #define _RE_COMPONENTBOUNDARY_H_ 35 36 #include "Component.h" 37 #include "position.h" 38 39 namespace ue2 { 40 41 /** \brief Encapsulates a line/string boundary assertion. */ 42 class ComponentBoundary : public Component { 43 friend class DumpVisitor; 44 friend class PrintVisitor; 45 friend class UnsafeBoundsVisitor; 46 friend class MultilineVisitor; 47 public: 48 enum Boundary { 49 BEGIN_STRING, //!< beginning of data stream 50 END_STRING, //!< end of data stream 51 END_STRING_OPTIONAL_LF, //!< end of data stream with an optional 52 // linefeed 53 BEGIN_LINE, //!< '(^|\\n)' 54 END_LINE //!< '($|\\n)' 55 }; 56 57 explicit ComponentBoundary(enum Boundary bound); 58 ~ComponentBoundary() override; 59 ComponentBoundary *clone() const override; 60 accept(ComponentVisitor & v)61 Component *accept(ComponentVisitor &v) override { 62 Component *c = v.visit(this); 63 v.post(this); 64 return c; 65 } 66 accept(ConstComponentVisitor & v)67 void accept(ConstComponentVisitor &v) const override { 68 v.pre(*this); 69 v.during(*this); 70 v.post(*this); 71 } 72 73 std::vector<PositionInfo> first() const override; 74 std::vector<PositionInfo> last() const override; 75 bool empty() const override; 76 bool repeatable() const override; 77 void notePositions(GlushkovBuildState &bs) override; 78 void buildFollowSet(GlushkovBuildState &bs, 79 const std::vector<PositionInfo> &lastPos) override; 80 bool checkEmbeddedStartAnchor(bool at_start) const override; 81 bool checkEmbeddedEndAnchor(bool at_end) const override; 82 83 private: 84 enum Boundary m_bound; //!< \brief which assertion is that? 85 Position m_newline; //!< \brief special newline state 86 std::vector<PositionInfo> m_first; //!< \brief positions returned for first() 87 std::vector<PositionInfo> m_last; //!< \brief positions returned for last() 88 89 ComponentBoundary(const ComponentBoundary &other); 90 }; 91 92 } // namespace ue2 93 94 #endif 95