CEvaluationLexer.h

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// Copyright (C) 2010 - 2015 by Pedro Mendes, Virginia Tech Intellectual
// Properties, Inc., University of Heidelberg, and The University
// of Manchester.
// All rights reserved.

// Copyright (C) 2008 - 2009 by Pedro Mendes, Virginia Tech Intellectual
// Properties, Inc., EML Research, gGmbH, University of Heidelberg,
// and The University of Manchester.
// All rights reserved.

// Copyright (C) 2005 - 2007 by Pedro Mendes, Virginia Tech Intellectual
// Properties, Inc. and EML Research, gGmbH.
// All rights reserved.

#ifndef COPASI_CEvaluationLexer
#define COPASI_CEvaluationLexer

#include <vector>

#undef yyFlexLexer
#include "FlexLexer.h"

#define yyFlexLexer CEvaluationLexer

#undef yyYaccParser
#define yyYaccParser CEvaluationParserBase

#undef YYDEBUG
#ifdef COPASI_DEBUG
# define YYDEBUG 0  // Set his different from zero to trace the parser
#else
# define YYDEBUG 0
#endif // COPASI_DEBUG

/**
 * This is a base class for the CEvaluationLexer adding member
 * attributes to enhance the internal functionality.
 */
class yyYaccParser
{
public:
  /**
   * Default constructor
   */
  yyYaccParser():
    mpNode(NULL),
    mpRootNode(NULL),
    mBoolean(false),
    mpNodeList(NULL),
    mPosition(0)
  {}

  /**
   * Destructor
   */
  virtual ~yyYaccParser() {}

  /**
   * Retrieve the generated list of nodes.
   * The user owns the list and is repsonsible for the destruction.
   * To delete the list please use freeNodeList.
   * Please note that each call to yylex() creates a new list which
   * must be destoyed.
   * @return std::vector< CEvaluationNode * > * pNodeList
   */
  std::vector< CEvaluationNode * > *getNodeList()
  {return mpNodeList;}

  /**
   * Convenient function to free the list of generated nodes.
   * @param std::vector< CEvaluationNode * > * pNodeList
   */
  static void freeNodeList(std::vector< CEvaluationNode * > * pNodeList)
  {
    if (pNodeList == NULL) return;

    std::vector< CEvaluationNode * >::iterator it;
    std::vector< CEvaluationNode * >::iterator end = pNodeList->end();

    for (it = pNodeList->begin(); it != end; ++it)
      if (*it && (*it)->getParent())
        (*it)->getParent()->removeChild(*it);

    for (it = pNodeList->begin(); it != end; ++it)
      pdelete(*it);

    pdelete(pNodeList);
  }

  virtual int yylex() = 0;

  virtual int yyparse();

  CEvaluationNode * getRootNode() {return mpRootNode;}

  bool isBoolean() const {return mBoolean;}

  size_t getErrorPosition() {return mPosition;}

protected:
  CEvaluationNode * mpNode;
  CEvaluationNode * mpRootNode;
  bool mBoolean;
  std::vector< CEvaluationNode * > * mpNodeList;
  size_t mPosition;

private:
  void correctErrorPosition()
  {
    std::vector< CEvaluationNode * >::iterator it
    = mpNodeList->begin();
    std::vector< CEvaluationNode * >::iterator end
    = mpNodeList->end();
    size_t oldPosition = mPosition;
    mPosition = 0;

    for (; it != end && mPosition < oldPosition; ++it)
      mPosition += (*it)->getData().length();

    if (mPosition > 0)
      mPosition -= (*--it)->getData().length();
  }
};

class CEvaluationLexer : public FlexLexer, public yyYaccParser
{
public:
  // arg_yyin and arg_yyout default to the cin and cout, but we
  // only make that assignment when initializing in yylex().
  yyFlexLexer(FLEX_STD istream* arg_yyin = 0, FLEX_STD ostream* arg_yyout = 0);

  virtual ~yyFlexLexer();

  void yy_switch_to_buffer(struct yy_buffer_state* new_buffer);
  struct yy_buffer_state* yy_create_buffer(FLEX_STD istream* s, int size);
  void yy_delete_buffer(struct yy_buffer_state* b);
  void yyrestart(FLEX_STD istream* s);

  void yypush_buffer_state(struct yy_buffer_state* new_buffer);
  void yypop_buffer_state(void);

  virtual int yylex();
  virtual void switch_streams(FLEX_STD istream* new_in, FLEX_STD ostream* new_out);
  virtual int yywrap() {return 1;}

protected:
  virtual size_t LexerInput(char* buf, size_t max_size);
  virtual void LexerOutput(const char* buf, size_t size);
  virtual void LexerError(const char* msg);

  void yyunput(int c, char* buf_ptr);
  int yyinput();

  void yy_load_buffer_state();

  void yy_init_buffer(struct yy_buffer_state* b, std::istream* s);

  void yy_flush_buffer(struct yy_buffer_state* b);

  int yy_start_stack_ptr;
  int yy_start_stack_depth;
  int* yy_start_stack;

  void yy_push_state(int new_state);
  void yy_pop_state();
  int yy_top_state();

  yy_state_type yy_get_previous_state();
  yy_state_type yy_try_NUL_trans(yy_state_type current_state);
  int yy_get_next_buffer();

  std::istream* yyin; // input source for default LexerInput
  std::ostream* yyout; // output sink for default LexerOutput

  struct yy_buffer_state* yy_current_buffer;

  // yy_hold_char holds the character lost when yytext is formed.
  char yy_hold_char;

  // Number of characters read into yy_ch_buf.
  int yy_n_chars;

  // Points to current character in buffer.
  char* yy_c_buf_p;

  int yy_init;  // whether we need to initialize
  int yy_start;  // start state number

  // Flag which is used to allow yywrap()'s to do buffer switches
  // instead of setting up a fresh yyin.  A bit of a hack ...
  int yy_did_buffer_switch_on_eof;

  size_t yy_buffer_stack_top; /**< index of top of stack. */
  size_t yy_buffer_stack_max; /**< capacity of stack. */
  struct yy_buffer_state ** yy_buffer_stack; /**< Stack as an array. */
  void yyensure_buffer_stack(void);

  // The following are not always needed, but may be depending
  // on use of certain flex features (like REJECT or yymore()).

  yy_state_type yy_last_accepting_state;
  char* yy_last_accepting_cpos;

  yy_state_type* yy_state_buf;
  yy_state_type* yy_state_ptr;

  char* yy_full_match;
  int* yy_full_state;
  int yy_full_lp;

  int yy_lp;
  int yy_looking_for_trail_begin;

  int yy_more_flag;
  int yy_more_len;
  int yy_more_offset;
  int yy_prev_more_offset;
};

#endif // COPASI_CEvaluationLexer