Program Listing for File StreamIO.h

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#ifndef STREAM_IO_H
#define STREAM_IO_H

#include <iostream>
#include <assert.h>

inline bool is_space( char c)
{
  return c == ' ' || c == '\t' || c == '\n';
}

inline bool is_num( char c)
{
  return c >= '0' && c <= '9';
}

inline bool is_id( char c)
{
  return c == '_' || (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z');
}

inline char getch( istream& in)
 {
    char c = in.get();
    return c;
 }

inline char read_ch( istream& in )
{
  char c = 0;
  do { c = getch(in); } while (in.good() && is_space(c));
  if (!in.good())
      return 0;
  return c;
}

inline void read_ch( istream& in, char c)
{
  char c1 = read_ch(in);
  if (c1 != c) {
     cerr << "read char error: expecting '" << c << "' instead of '" << c1 << "'\n";
     ROSE_ABORT();
  }
}

inline string read_id( istream& in )
{
  char c = read_ch(in);
  string buf = "";
  while (in.good() && (is_id(c) || is_num(c)) ) {
    buf.push_back(c);
    c = getch(in);
  }
  if (in.good())
    in.unget();
  return buf;
}

inline void read_id( istream& in, const string& id )
{
  string id1 = read_id(in);
  if (id1 != id) {
     cerr << "read id error: expecting '" << id << "' instead of '" << id1 << "'\n";
     ROSE_ABORT();
  }
}

inline string read_num( istream& in )
{
  char c = read_ch(in);
  if (!in.good())
      return "";
  assert( is_num(c));
  string buf = "";
  buf.push_back(c);
  for (;;) {
    c = getch(in);
    if ( !is_num(c) && c != '.') {
      in.unget();
      break;
    }
    buf.push_back(c);
  }
  return buf;
}

template <class ItemGen>
void read_list( istream& in, ItemGen& op )
{
  op.read(in);
  while (in.good()) {
    char c = read_ch(in);
    if (c != ',')
        break;
    op.read(in);
  }
  if (in.good())
    in.unget();
}

template <class ItemGen, class Container>
class ReadContainerWrap
{
  ItemGen &op;
  Container& c;
 public:
  ReadContainerWrap( ItemGen& _op, Container& _c) : op(_op), c(_c) {}
  void read( istream& in)
   { c.push_back( op.read(in) ); }
};

#endif