elem_text_out()

void DPoly::elem_text_out	(	buffer &	o,
		int	level,
		const TowerPolynomial	f,
		bool	p_one,
		bool	p_plus,
		bool	p_parens,
		M2_ArrayString	names ) const

Definition at line 144 of file dpoly.cpp.

{
  // o << to_string(level, f);
  if (f == nullptr)
    {
      o << "0";
      return;
    }
 
  int nterms = n_nonzero_terms(level, f);
  bool needs_parens = p_parens && (nterms >= 2);
 
  if (needs_parens)
    {
      if (p_plus) o << '+';
      o << '(';
      p_plus = false;
    }
 
  bool one = is_one(level, f);
 
  if (one)
    {
      if (p_plus) o << "+";
      if (p_one) o << "1";
      return;
    }
 
  M2_string this_varname = names->array[level];
 
  if (level == 0)
    {
      bool firstterm = true;
      for (int i = f->deg; i >= 0; i--)
        if (f->arr.ints[i] != 0)
          {
            if (!firstterm || p_plus) o << "+";
            firstterm = false;
            if (i == 0 || f->arr.ints[i] != 1) o << f->arr.ints[i];
            if (i > 0) o << this_varname;
            if (i > 1) o << i;
          }
      if (needs_parens) o << ")";
    }
  else
    {
      bool firstterm = true;
      for (int i = f->deg; i >= 0; i--)
        if (f->arr.polys[i] != nullptr)
          {
            bool this_p_parens = p_parens || (i > 0);
 
            if (i == 0 || !is_one(level - 1, f->arr.polys[i]))
              elem_text_out(o,
                            level - 1,
                            f->arr.polys[i],
                            p_one,
                            p_plus || !firstterm,
                            this_p_parens,
                            names);
            else if (p_plus || !firstterm)
              o << "+";
            if (i > 0) o << this_varname;
            if (i > 1) o << i;
 
            firstterm = false;
          }
      if (needs_parens) o << ")";
    }
}

References elem_text_out(), is_one(), and n_nonzero_terms().

Referenced by elem_text_out(), and extensions_text_out().