text: /*
  Open Asset Import Library (assimp)
  ----------------------------------------------------------------------
  
  Copyright (c) 2006-2021, assimp team
  
  
  All rights reserved.
  
  Redistribution and use of this software 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 the assimp team, nor the names of its
    contributors may be used to endorse or promote products
    derived from this software without specific prior
    written permission of the assimp team.
  
  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.
  
  ----------------------------------------------------------------------
  */
  
  /** @file  LineSplitter.h
   *  @brief LineSplitter, a helper class to iterate through all lines
   *    of a file easily. Works with StreamReader.
   */
  #pragma once
  #ifndef INCLUDED_LINE_SPLITTER_H
  #define INCLUDED_LINE_SPLITTER_H
  
  #ifdef __GNUC__
  #   pragma GCC system_header
  #endif
  
  #include <stdexcept>
  #include <assimp/StreamReader.h>
  #include <assimp/ParsingUtils.h>
  
  namespace Assimp {
  
  // ------------------------------------------------------------------------------------------------
  /** Usage:
  @code
  for(LineSplitter splitter(stream);splitter;++splitter) {
  
      if (*splitter == "hi!") {
         ...
      }
      else if (splitter->substr(0,5) == "hello") {
         ...
         // access the third token in the line (tokens are space-separated)
         if (strtol(splitter[2]) > 5) { .. }
      }
  
      ASSIMP_LOG_VERBOSE_DEBUG("Current line is: ", splitter.get_index());
  }
  @endcode
  */
  // ------------------------------------------------------------------------------------------------
  class LineSplitter {
  public:
      typedef size_t line_idx;
  
      // -----------------------------------------
      /** construct from existing stream reader
      note: trim is *always* assumed true if skyp_empty_lines==true
      */
      LineSplitter(StreamReaderLE& stream, bool skip_empty_lines = true, bool trim = true);
  
      ~LineSplitter();
  
      // -----------------------------------------
      /** pseudo-iterator increment */
      LineSplitter& operator++();
  
      // -----------------------------------------
      LineSplitter& operator++(int);
  
      // -----------------------------------------
      /** get a pointer to the beginning of a particular token */
      const char* operator[] (size_t idx) const;
  
      // -----------------------------------------
      /** extract the start positions of N tokens from the current line*/
      template <size_t N>
      void get_tokens(const char* (&tokens)[N]) const;
  
      // -----------------------------------------
      /** member access */
      const std::string* operator -> () const;
  
      std::string operator* () const;
  
      // -----------------------------------------
      /** boolean context */
      operator bool() const;
  
      // -----------------------------------------
      /** line indices are zero-based, empty lines are included */
      operator line_idx() const;
  
      line_idx get_index() const;
  
      // -----------------------------------------
      /** access the underlying stream object */
      StreamReaderLE& get_stream();
  
      // -----------------------------------------
      /** !strcmp((*this)->substr(0,strlen(check)),check) */
      bool match_start(const char* check);
  
      // -----------------------------------------
      /** swallow the next call to ++, return the previous value. */
      void swallow_next_increment();
  
      LineSplitter( const LineSplitter & ) = delete;
      LineSplitter(LineSplitter &&) = delete;
      LineSplitter &operator = ( const LineSplitter & ) = delete;
  
  private:
      line_idx mIdx;
      std::string mCur;
      StreamReaderLE& mStream;
      bool mSwallow, mSkip_empty_lines, mTrim;
  };
  
  AI_FORCE_INLINE
  LineSplitter::LineSplitter(StreamReaderLE& stream, bool skip_empty_lines, bool trim )
  : mIdx(0)
  , mCur()
  , mStream(stream)
  , mSwallow()
  , mSkip_empty_lines(skip_empty_lines)
  , mTrim(trim) {
      mCur.reserve(1024);
      operator++();
      mIdx = 0;
  }
  
  AI_FORCE_INLINE
  LineSplitter::~LineSplitter() {
      // empty
  }
  
  AI_FORCE_INLINE
  LineSplitter& LineSplitter::operator++() {
      if (mSwallow) {
          mSwallow = false;
          return *this;
      }
  
      if (!*this) {
          throw std::logic_error("End of file, no more lines to be retrieved.");
      }
  
      char s;
      mCur.clear();
      while (mStream.GetRemainingSize() && (s = mStream.GetI1(), 1)) {
          if (s == '\n' || s == '\r') {
              if (mSkip_empty_lines) {
                  while (mStream.GetRemainingSize() && ((s = mStream.GetI1()) == ' ' || s == '\r' || s == '\n'));
                  if (mStream.GetRemainingSize()) {
                      mStream.IncPtr(-1);
                  }
              } else {
                  // skip both potential line terminators but don't read past this line.
                  if (mStream.GetRemainingSize() && (s == '\r' && mStream.GetI1() != '\n')) {
                      mStream.IncPtr(-1);
                  }
                  if (mTrim) {
                      while (mStream.GetRemainingSize() && ((s = mStream.GetI1()) == ' ' || s == '\t'));
                      if (mStream.GetRemainingSize()) {
                          mStream.IncPtr(-1);
                      }
                  }
              }
              break;
          }
          mCur += s;
      }
      ++mIdx;
  
      return *this;
  }
  
  AI_FORCE_INLINE
  LineSplitter &LineSplitter::operator++(int) {
      return ++(*this);
  }
  
  AI_FORCE_INLINE
  const char *LineSplitter::operator[] (size_t idx) const {
      const char* s = operator->()->c_str();
  
      SkipSpaces(&s);
      for (size_t i = 0; i < idx; ++i) {
  
          for (; !IsSpace(*s); ++s) {
              if (IsLineEnd(*s)) {
                  throw std::range_error("Token index out of range, EOL reached");
              }
          }
          SkipSpaces(&s);
      }
      return s;
  }
  
  template <size_t N>
  AI_FORCE_INLINE
  void LineSplitter::get_tokens(const char* (&tokens)[N]) const {
      const char* s = operator->()->c_str();
  
      SkipSpaces(&s);
      for (size_t i = 0; i < N; ++i) {
          if (IsLineEnd(*s)) {
              throw std::range_error("Token count out of range, EOL reached");
          }
          tokens[i] = s;
  
          for (; *s && !IsSpace(*s); ++s);
          SkipSpaces(&s);
      }
  }
  
  AI_FORCE_INLINE
  const std::string* LineSplitter::operator -> () const {
      return &mCur;
  }
  
  AI_FORCE_INLINE
  std::string LineSplitter::operator* () const {
      return mCur;
  }
  
  AI_FORCE_INLINE
  LineSplitter::operator bool() const {
      return mStream.GetRemainingSize() > 0;
  }
  
  AI_FORCE_INLINE
  LineSplitter::operator line_idx() const {
      return mIdx;
  }
  
  AI_FORCE_INLINE
  LineSplitter::line_idx LineSplitter::get_index() const {
      return mIdx;
  }
  
  AI_FORCE_INLINE
  StreamReaderLE &LineSplitter::get_stream() {
      return mStream;
  }
  
  AI_FORCE_INLINE
  bool LineSplitter::match_start(const char* check) {
      const size_t len = ::strlen(check);
  
      return len <= mCur.length() && std::equal(check, check + len, mCur.begin());
  }
  
  AI_FORCE_INLINE
  void LineSplitter::swallow_next_increment() {
      mSwallow = true;
  }
  
  } // Namespace Assimp
  
  #endif // INCLUDED_LINE_SPLITTER_H
  