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C:/temp/src/j2k/DataType/Parenth.Frd/Parenth.cpp

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// Parenth.cpp - Parenthesis Checking Class Implementation

#include "Parenth.hpp"

int Parenth::read(const char* datafile)
{
   FILE*  record = NULL;         // Initialize variable
   DBase*   _db;              // Contains current data info
   Stack*   _stk;             // Contains the Double-Linked list Object

   char c = 0;
   char FLine[ LINE_SIZE ];      // MaxLength of a file line
   int  pos[   LINE_SIZE ];      // Storing '?' or ' ' on the next line

   bool perr;
   int  p = 0;
   int  i = 0;
   int  j = 0;

   for( i = 0; i < LINE_SIZE; i++ ) {  // Initialize to zero for stability.
      pos[i] = 0;
   }

   // Open a file in read-only text mode, if the file exist.
   if ( (record = fopen(datafile, "rt") ) == NULL)
   {
      cout << "Cannot open the data file [" << datafile;
      cout << "] in the current directory." << endl;
      return 1;
   }

   while ( !feof(record) )       // Loop until end of file
   {
      c = fgetc( record );    // Read a Byte from the record file

      if ( c != 13 && c != 10 )   // Scanning for CR, LF ASCII Code 
      {                    
         FLine[p] = c;        // Add the new char to the array.
         p++;
         FLine[p] = '\0';
      } else if ( p > 0 ) {      // We reached a end of line byte.
         FLine[p] = '\0';


      // We just read a line, so let's find the parenthesis match...

         _stk  = new Stack(); // Create a Stack
         perr  = false;

         cout << FLine << endl;

         for( i = 0; i < p; i++ ) {    // Read the line again...

            c = FLine[i];

            if ( c == '(' ) {
               _db = new DBase( i );   // Will be deleted by ~Stack()
               _stk->push( _db );   
            } else if ( c == ')' ) {
               _db = _stk->pop();
               if ( _db == NULL ) {
                  pos[i] = -1;
                  perr = true;
               } else {
                  delete _db;
               }
            }

         }

         while ( _stk->isNotEmpty() ) {   // Scan for remaining '('
            _db = _stk->pop();
            pos[ _db->pos() ] = 1;
            perr = true;
            delete _db;
         }

         if ( perr ) {              // Initialize to zero for stability
            for( i = 0; i < LINE_SIZE; i++ ) { 
               if ( pos[i] == 0 ) {
                  cout << " ";
               } else {
                  cout << "?";
                  pos[i] = 0;
               }
            }
            cout << endl << msg_BAD;
         } else {
            cout << msg_OK;
         }
   
         if ( _stk->isNotEmpty() )     // Delete the Stack object
            delete _stk;            

         p = 0;               // Reset the counter for the next file read

      } // End of line

   } // End of file while loop

   fclose(record);

   return 0;
}

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