esrgpcpj/hyreach/mf_lex.c

/* $Header: /cvsroot/esrg/sfesrg/esrgpcpj/hyreach/mf_lex.c,v 1.5 2002/01/30 00:51:04 dtashley Exp $
**
** This module defines functions which are related to lexically
** analyzing the HyReach model input file.
*/

//--------------------------------------------------------------------------------
//Copyright 2001 David T. Ashley
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//-------------------------------------------------------------------------------------------------
//--------------------------------------------------------------------------------
#define MODULE_MF_LEX

#include <assert.h>
#include <stdio.h>

#include "ccmalloc.h"
#include "mf_lex.h"


//This module implements a character-by-character parser which breaks the input file
//into tokens, allowing string literals to be quoted and allowing the standard 'C' and
//'C++' style of comments to be used.  The major functionality implemented by this FSA
//parser is:
//   (a)'C'-style comments may be used.
//   (b)'C++'-style comments may be used.
//   (c)The sequence \" may be used to embed a quote character in a token or string
//      literal (this is the standard way of doing it in most programming languages).
//   (d)The +" sequence may be used to start a string literal and to cause it to
//      be concatenated with the previous token.
//
//There are lots of subtleties to the way that this parser operates (subtle behaviors),
//but these can be elicited by studying the state machine design.  For example,
//'C++'-style comment delimiters within 'C' comments are ignored, and vice-versa.
//
//The documentation of the FSA parser is contained in the file (with relative path)
//docs/mf_lex/mf_lex_fsa_01.abc, which is an ABC-flowcharter document generated by
//ABC Flowcharter version 6.0a.
//
//Each state in the ABC Flowcharter document is named, and each transition is
//numbered.  These states and [outgoing] transitions are described in detail below.
//
//   START (initial state)
//      The parser is in between tokens.
//
//      Outgoing Transitions:
//         [001]:  Character is whitespace.  Only column number advances.
//         [002]:  Character is LF.  This is out-of-order for Windows systems, but
//                 standard for Unix systems.  column number resets to 1 for new
//                 line, line counter advances to indicate new line.
//         [003]:  Is not any of the special characters, so is the start of a token.
//                 Set token to be this character, will perhaps append more chars
//                 later.  Advance column number.
//         [004]:  Character is opening quote.  Advance column number.  Set token
//                 to the empty string, will probably add more characters to token
//                 later.

/* The allocation increment (in characters) for tokens in the list 
** returned.  This is a balance between efficiency and memory waste.
*/
#define MF_LEX_TOKEN_CHAR_ALLOC_INC  (100)

/* The allocation increment (in tokens, in the token array).  This is
** a static rather than a proportional hit, so there is no harm in
** going large here.  The increment below (10000) grabs about 40K 
** bytes at a time.
*/
#define MF_LEX_TOKEN_PTR_ALLOC_INC   (10000)


unsigned MF_LEX_cclass(unsigned char arg)
   {
   unsigned rv = 0;

   if (arg == 0)
      {
      rv = MF_LEX_CCLASS_TERMINATOR;
      goto endpoint;
      }
   else if (arg >= 128)
      {
      rv = MF_LEX_CCLASS_ILLEGAL;
      goto endpoint;
      }
   else
      {
      /* In this path, the character is legal to be in the source
      ** file.  OR in all the right flags.
      */

      if (arg == '\\')
         {
         rv |= MF_LEX_CCLASS_BACKSLASH;
         }

      if (arg == '\"')
         {
         rv |= MF_LEX_CCLASS_DOUBLE_QUOTE;
         }

      if (arg == ' ')
         {
         rv |= MF_LEX_CCLASS_SPACE;
         }

      if (arg == '\t')
         {
         rv |= MF_LEX_CCLASS_TAB;
         }

      if ((arg >= '0') && (arg <= '9'))
         {
         rv |= MF_LEX_CCLASS_DIGIT;
         }

      if ((arg >= 'a') && (arg <= 'z'))
         {
         rv |= MF_LEX_CCLASS_LC_LETTER;
         }

      if ((arg >= 'A') && (arg <= 'Z'))
         {
         rv |= MF_LEX_CCLASS_UC_LETTER;
         }

      /* A character which is legal but not
      ** whitespace can be defined recursively.  It it were not
      ** legal, we would not be here, and whitespace (which is defined
      ** canonically as space or tab only) has already been calculated.
      */
      if (rv & (MF_LEX_CCLASS_SPACE | MF_LEX_CCLASS_TAB))
         {
         rv |= MF_LEX_CCLASS_LEGAL_NON_WHITESPACE;
         }

      if (arg == '{')
         {
         rv |= MF_LEX_CCLASS_OPEN_BRACE;
         }

      if (arg == '}')
         {
         rv |= MF_LEX_CCLASS_CLOSE_BRACE;
         }

      if (arg == '/')
         {
         rv |= MF_LEX_CCLASS_SLASH;
         }

      if (arg == '*')
         {
         rv |= MF_LEX_CCLASS_ASTERISK;
         }

      if (arg == 13)
         {
         rv |= MF_LEX_CCLASS_CR;
         }

      if (arg == 10)
         {
         rv |= MF_LEX_CCLASS_LF;
         }
      }

   endpoint:
      return(rv);
   }


void MF_LEX_parse(const char        *fname,
                  unsigned          *ntokens,
                  MF_LEX_TOKEN_PTR **tokens,
                  int               *result_code)
   {
   FILE *mf_stream;
      /* The model input file.
      */
   int end_of_file;
      /* TRUE if EOF found.
      */
   int file_int;
      /* The integer read from the file which might also be the EOF
      ** code.
      */
   unsigned char file_char;
      /* The character read from the file.  This is only
      ** defined if EOF is not true.
      */
   int parser_state;
      /* The state of the parser, a discrete value.
      */
   int exit_flag;
      /* TRUE if something was encountered which should cause
      ** the parser to exit.
      */
   int warnings_found;
      /* TRUE if warnings were issued.
      */
   int fatals_found;
      /* TRUE if an error which should cause the program to
      ** abort because the model input file is 
      ** essentially unusable.
      */

   /* Eyeball the input parameters closely.
   */
   assert(fname       != NULL);
   assert(ntokens     != NULL);
   assert(tokens      != NULL);
   assert(*tokens     == NULL);
   assert(result_code != NULL);

   /* Set the pointer to the array of tokens NULL and the 
   ** number of tokens to 0.  This is in case we crap out on
   ** the file open--we need to have these set even in that case.
   */
   *tokens = NULL;
   *ntokens = 0;

   /* Try to open the model input file for reading.  We may die here.
   */
   mf_stream = fopen(fname, "rb");
   if (!mf_stream)
      {
      *result_code = MF_LEX_PARSE_RESULT_ERROR_FOPEN;
      return;
      }

   /* Run the parser, which is a finite state machine arrangement.
   ** The documentation of the parser is in the file mf_lex_fsa_01.abc,
   ** a Micrografx ABC-Flowcharter document, which is also under version 
   ** control.  The documentation is slightly incomplete, but this is a 
   ** very straightforward parser.  Symbolic names and comments are
   ** taken from the ABC-Flowcharter document.
   */
   end_of_file    = 0;
   file_char      = 0;
   parser_state   = 0;
   exit_flag      = 0;
   warnings_found = 0;
   fatals_found   = 0;

   while (!exit_flag)
      {
      /* Grab the character, which might also be the EOF code.
      */
      file_int  = fgetc(mf_stream);

      file_char = file_int;

      /* If the EOF code is indicated, we must differentiate between an 
      ** EOF and a read error.  An EOF is normal and expected, but
      ** a read error must be treated differently.
      */
      if (file_int == EOF)
         {
         if (feof(mf_stream))
            {
            /* EOF, which is normal and expected.
            */
            end_of_file = 1;
            }
         else
            {
            /* Presumably a file read error, which is abnormal and necessarily
            ** fatal.
            */

            }
         }  /* End if returned EOF */

      /* As a temporary measure until get the parser into place, just terminate on EOF and
      ** return OK.
      */

      if (file_int == EOF)
         {
         exit_flag = 1;
         }
      }  /* End while() */


   *result_code = MF_LEX_PARSE_RESULT_OK;

   }  /* End function */


void MF_LEX_token_list_destroy(
                              unsigned          *ntokens,
                              MF_LEX_TOKEN_PTR **tokens)
   {
   unsigned i;
   MF_LEX_TOKEN_PTR p;

   /* Eyeball the input parameters.   However, we don't want to check that the
   ** list of tokens is non-NULL unless the count is non-zero.
   */
   assert(ntokens  != NULL);
   assert(tokens   != NULL);

   if (*ntokens)
      {
      /* The number of tokens is non-zero.  In this case the pointer to the array of
      ** tokens may not be NULL.
      */
      assert(*tokens != NULL);

      /* For each token in the array.
      */
      for (i=0; i<*ntokens; i++)
         {
         /* Get the pointer to the token. */
         p = (*tokens)[i];

         /* The token must have storage allocated.  Even an empty string must have the
         ** zero terminator.
         */
         assert(p->token != NULL);

         /* Free the token string storage. */
         CCMALLOC_free(p->token);

         /* Free the space for the token structure itself. */
         CCMALLOC_free(p);
         }

      /* Free up the array itself and set the pointer to NULL.
      */
      CCMALLOC_free(*tokens);
      *tokens = NULL;
      }
   else
      {
      /* The array has no elements.  In this case the pointer must be
      ** NULL.
      */
      assert(*tokens == NULL);
      }
   }


const char *MF_LEX_cvcinfo(void)
   {
   return("$Header: /cvsroot/esrg/sfesrg/esrgpcpj/hyreach/mf_lex.c,v 1.5 2002/01/30 00:51:04 dtashley Exp $");
   }


const char *MF_LEX_hvcinfo(void)
   {
   return(MF_LEX_H_VERSION);
   }


/******************************************************************************
** $Log: mf_lex.c,v $
** Revision 1.5  2002/01/30 00:51:04  dtashley
** Nightly safety checkin.
**
** Revision 1.4  2001/12/13 07:36:35  dtashley
** Evening safety checkin.
**
** Revision 1.3  2001/12/07 05:06:33  dtashley
** Evening safety checkin.
**
** Revision 1.2  2001/12/01 21:29:18  dtashley
** Safety checkin after edits.
**
** Revision 1.1  2001/12/01 21:23:44  dtashley
** Initial checkin.
*******************************************************************************
** End of MF_LEX.C. */