Any complex number can be (un)archived properly.
[ginac.git] / ginac / numeric.cpp
index 69a787b5d985b5e174ea61a6f38c7b89f2bb3a2c..49951470475de6ccf9de61b97b9f76e03a259d88 100644 (file)
@@ -255,60 +255,120 @@ numeric::numeric(const cln::cl_N &z) : basic(&numeric::tinfo_static)
 // archiving
 //////////
 
-numeric::numeric(const archive_node &n, lst &sym_lst) : inherited(n, sym_lst)
+/** 
+ * Construct a floating point number from sign, mantissa, and exponent 
+ */
+static const cln::cl_F make_real_float(const cln::cl_idecoded_float& dec)
 {
-       cln::cl_N ctorval = 0;
+       cln::cl_F x = cln::cl_float(dec.mantissa, cln::default_float_format);
+       x = cln::scale_float(x, dec.exponent);
+       cln::cl_F sign = cln::cl_float(dec.sign, cln::default_float_format);
+       x = cln::float_sign(sign, x);
+       return x;
+}
+
+/** 
+ * Read serialized floating point number 
+ */
+static const cln::cl_F read_real_float(std::istream& s)
+{
+       cln::cl_idecoded_float dec;
+       s >> dec.sign >> dec.mantissa >> dec.exponent;
+       const cln::cl_F x = make_real_float(dec);
+       return x;
+}
 
+numeric::numeric(const archive_node &n, lst &sym_lst) : inherited(n, sym_lst)
+{
+       value = 0;
+       
        // Read number as string
        std::string str;
        if (n.find_string("number", str)) {
                std::istringstream s(str);
-               cln::cl_idecoded_float re, im;
+               cln::cl_R re, im;
                char c;
                s.get(c);
                switch (c) {
-                       case 'R':    // Integer-decoded real number
-                               s >> re.sign >> re.mantissa >> re.exponent;
-                               ctorval = re.sign * re.mantissa * cln::expt(cln::cl_float(2.0, cln::default_float_format), re.exponent);
+                       case 'R':
+                               // real FP (floating point) number
+                               re = read_real_float(s);
+                               value = re;
+                               break;
+                       case 'C':
+                               // both real and imaginary part are FP numbers
+                               re = read_real_float(s);
+                               im = read_real_float(s); 
+                               value = cln::complex(re, im);
+                               break;
+                       case 'H':
+                               // real part is a rational number,
+                               // imaginary part is a FP number
+                               s >> re;
+                               im = read_real_float(s);
+                               value = cln::complex(re, im);
                                break;
-                       case 'C':    // Integer-decoded complex number
-                               s >> re.sign >> re.mantissa >> re.exponent;
-                               s >> im.sign >> im.mantissa >> im.exponent;
-                               ctorval = cln::complex(re.sign * re.mantissa * cln::expt(cln::cl_float(2.0, cln::default_float_format), re.exponent),
-                                                      im.sign * im.mantissa * cln::expt(cln::cl_float(2.0, cln::default_float_format), im.exponent));
+                       case 'J':
+                               // real part is a FP number,
+                               // imaginary part is a rational number
+                               re = read_real_float(s);
+                               s >> im;
+                               value = cln::complex(re, im);
                                break;
-                       default:    // Ordinary number
+                       default:
+                               // both real and imaginary parts are rational
                                s.putback(c);
-                               s >> ctorval;
+                               s >> value;
                                break;
                }
        }
-       value = ctorval;
        setflag(status_flags::evaluated | status_flags::expanded);
 }
 
+static void write_real_float(std::ostream& s, const cln::cl_R& n)
+{
+       const cln::cl_idecoded_float dec = cln::integer_decode_float(cln::the<cln::cl_F>(n));
+       s << dec.sign << ' ' << dec.mantissa << ' ' << dec.exponent;
+}
+
 void numeric::archive(archive_node &n) const
 {
        inherited::archive(n);
 
        // Write number as string
+       
+       const cln::cl_R re = cln::realpart(value);
+       const cln::cl_R im = cln::imagpart(value);
+       const bool re_rationalp = cln::instanceof(re, cln::cl_RA_ring);
+       const bool im_rationalp = cln::instanceof(im, cln::cl_RA_ring);
+
+       // Non-rational numbers are written in an integer-decoded format
+       // to preserve the precision
        std::ostringstream s;
-       if (this->is_crational())
+       if (re_rationalp && im_rationalp)
                s << value;
-       else {
-               // Non-rational numbers are written in an integer-decoded format
-               // to preserve the precision
-               if (this->is_real()) {
-                       cln::cl_idecoded_float re = cln::integer_decode_float(cln::the<cln::cl_F>(value));
-                       s << "R";
-                       s << re.sign << " " << re.mantissa << " " << re.exponent;
-               } else {
-                       cln::cl_idecoded_float re = cln::integer_decode_float(cln::the<cln::cl_F>(cln::realpart(cln::the<cln::cl_N>(value))));
-                       cln::cl_idecoded_float im = cln::integer_decode_float(cln::the<cln::cl_F>(cln::imagpart(cln::the<cln::cl_N>(value))));
-                       s << "C";
-                       s << re.sign << " " << re.mantissa << " " << re.exponent << " ";
-                       s << im.sign << " " << im.mantissa << " " << im.exponent;
-               }
+       else if (zerop(im)) {
+               // real FP (floating point) number
+               s << 'R';
+               write_real_float(s, re);
+       } else if (re_rationalp) {
+               s << 'H'; // just any unique character
+               // real part is a rational number,
+               // imaginary part is a FP number
+               s << re << ' ';
+               write_real_float(s, im);
+       } else if (im_rationalp) {
+               s << 'J';
+               // real part is a FP number,
+               // imaginary part is a rational number
+               write_real_float(s, re);
+               s << ' ' << im;
+       } else  {
+               // both real and imaginary parts are floating point
+               s << 'C';
+               write_real_float(s, re);
+               s << ' ';
+               write_real_float(s, im);
        }
        n.add_string("number", s.str());
 }