OCCT

// -*-C++-*-
// FlexLexer.h -- define interfaces for lexical analyzer classes generated
// by flex

// Copyright (c) 1993 The Regents of the University of California.
// All rights reserved.
//
// This code is derived from software contributed to Berkeley by
// Kent Williams and Tom Epperly.
//
//  Redistribution and use in source and binary forms, with or without
//  modification, are permitted provided that the following conditions
//  are met:

//  1. Redistributions of source code must retain the above copyright
//  notice, this list of conditions and the following disclaimer.
//  2. 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 University 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 ``AS IS'' AND WITHOUT ANY EXPRESS OR
//  IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
//  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
//  PURPOSE.

// This file defines FlexLexer, an abstract class which specifies the
// external interface provided to flex C++ lexer objects, and yyFlexLexer,
// which defines a particular lexer class.
//
// If you want to create multiple lexer classes, you use the -P flag
// to rename each yyFlexLexer to some other xxFlexLexer.  You then
// include <FlexLexer.h> in your other sources once per lexer class:
//
//      #undef yyFlexLexer
//      #define yyFlexLexer xxFlexLexer
//      #include <FlexLexer.h>
//
//      #undef yyFlexLexer
//      #define yyFlexLexer zzFlexLexer
//      #include <FlexLexer.h>
//      ...

#ifndef __FLEX_LEXER_H
// Never included before - need to define base class.
#define __FLEX_LEXER_H

#include <iostream>

extern "C++"
{

  struct yy_buffer_state;
  typedef int yy_state_type;

  class FlexLexer
  {
  public:
    virtual ~FlexLexer() = default;

    const char* YYText() const { return yytext; }

    int YYLeng() const { return yyleng; }

    virtual void             yy_switch_to_buffer(yy_buffer_state* new_buffer) = 0;
    virtual yy_buffer_state* yy_create_buffer(std::istream* s, int size)      = 0;
    virtual yy_buffer_state* yy_create_buffer(std::istream& s, int size)      = 0;
    virtual void             yy_delete_buffer(yy_buffer_state* b)             = 0;
    virtual void             yyrestart(std::istream* s)                       = 0;
    virtual void             yyrestart(std::istream& s)                       = 0;

    virtual int yylex() = 0;

    // Call yylex with new input/output sources.
    int yylex(std::istream& new_in, std::ostream& new_out)
    {
      switch_streams(new_in, new_out);
      return yylex();
    }

    int yylex(std::istream* new_in, std::ostream* new_out = nullptr)
    {
      switch_streams(new_in, new_out);
      return yylex();
    }

    // Switch to new input/output streams.  A nil stream pointer
    // indicates "keep the current one".
    virtual void switch_streams(std::istream* new_in, std::ostream* new_out) = 0;
    virtual void switch_streams(std::istream& new_in, std::ostream& new_out) = 0;

    int lineno() const { return yylineno; }

    int debug() const { return yy_flex_debug; }

    void set_debug(int flag) { yy_flex_debug = flag; }

  protected:
    char* yytext;
    int   yyleng;
    int   yylineno;      // only maintained if you use %option yylineno
    int   yy_flex_debug; // only has effect with -d or "%option debug"
  };
}
#endif // FLEXLEXER_H

#if defined(yyFlexLexer) || !defined(yyFlexLexerOnce)
// Either this is the first time through (yyFlexLexerOnce not defined),
// or this is a repeated include to define a different flavor of
// yyFlexLexer, as discussed in the flex manual.
#define yyFlexLexerOnce

extern "C++"
{

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

  private:
    void ctor_common();

  public:
    virtual ~yyFlexLexer();

    void             yy_switch_to_buffer(yy_buffer_state* new_buffer);
    yy_buffer_state* yy_create_buffer(std::istream* s, int size);
    yy_buffer_state* yy_create_buffer(std::istream& s, int size);
    void             yy_delete_buffer(yy_buffer_state* b);
    void             yyrestart(std::istream* s);
    void             yyrestart(std::istream& s);

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

    virtual int  yylex();
    virtual void switch_streams(std::istream& new_in, std::ostream& new_out);
    virtual void switch_streams(std::istream* new_in = nullptr, std::ostream* new_out = nullptr);
    virtual int  yywrap();

  protected:
    virtual int  LexerInput(char* buf, int max_size);
    virtual void LexerOutput(const char* buf, int 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(yy_buffer_state* b, std::istream& s);
    void yy_flush_buffer(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

    // 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. */
    yy_buffer_state** yy_buffer_stack;     /**< Stack as an array. */
    void              yyensure_buffer_stack();

    // 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 // yyFlexLexer || ! yyFlexLexerOnce