codefrags.cpp

用于词法分析的词法分析器

/*
  $Id: CodeFrags.cpp,v 1.4 1997/02/02 01:31:02 matt Exp $

  Code frags handler class.

  (c) Matt Phillips 1996.
  */

#include <ctype.h>

#include "CodeFrags.h"

static const string sectionSep ("*");

int CodeFrags::nextFrag ()
{
  nextSection ();
  
  atFrag = 0;			// pessimistic!

  // look for language
  while (!input.eof () && line.length () != 0 && line != lang)
  {
    if (line == sectionSep)
      return 0;
    getline (input, line);
  }

  atFrag = !input.eof ();
  getline (input, line);

  return atFrag;
}

void CodeFrags::nextSection ()
{
  while (line != sectionSep && !input.eof ())
  {
    getline (input, line);
  };

  getline (input, line);
}

void CodeFrags::outputFrag (ostream &output)
{
  if (hasFrag)
  {
    while (line [0] == '>' && !input.eof ())
    {
      if (line.length () > 1)
	output << line.substr (1, line.length () - 1) << endl;
      else
	output << endl;

      getline (input, line); 
    }
  }
  atFrag = 0;
}