func (i BigInt) Sprint(conf *config.Config) string {
bitLen := i.BitLen()
format := conf.Format()
var maxBits = (uint64(conf.MaxDigits()) * 33222) / 10000 // log 10 / log 2 is 3.32192809489
if uint64(bitLen) > maxBits && maxBits != 0 {
// Print in floating point.
return BigFloat{newF(conf).SetInt(i.Int)}.Sprint(conf)
}
if format != "" {
verb, prec, ok := conf.FloatFormat()
if ok {
return i.floatString(verb, prec)
}
return fmt.Sprintf(format, i.Int)
}
// Is this from a rational and we could use an int?
if i.BitLen() < intBits {
return Int(i.Int64()).Sprint(conf)
}
switch conf.OutputBase() {
case 0, 10:
return fmt.Sprintf("%d", i.Int)
case 2:
return fmt.Sprintf("%b", i.Int)
case 8:
return fmt.Sprintf("%o", i.Int)
case 16:
return fmt.Sprintf("%x", i.Int)
}
Errorf("can't print number in base %d (yet)", conf.OutputBase())
return ""
}
func (r BigRat) Sprint(conf *config.Config) string {
format := conf.Format()
if format != "" {
verb, prec, ok := conf.FloatFormat()
if ok {
return r.floatString(verb, prec)
}
return fmt.Sprintf(conf.RatFormat(), r.Num(), r.Denom())
}
num := BigInt{r.Num()}
den := BigInt{r.Denom()}
return fmt.Sprintf("%s/%s", num.Sprint(conf), den.Sprint(conf))
}
func (i Int) Sprint(conf *config.Config) string {
format := conf.Format()
if format != "" {
verb, prec, ok := conf.FloatFormat()
if ok {
return i.floatString(verb, prec)
}
return fmt.Sprintf(format, int64(i))
}
base := conf.OutputBase()
if base == 0 {
base = 10
}
return strconv.FormatInt(int64(i), base)
}
// save writes the state of the workspace to the named file.
// The format of the output is ivy source text.
func save(c *exec.Context, file string, conf *config.Config) {
// "<conf.out>" is a special case for testing.
out := conf.Output()
if file != "<conf.out>" {
fd, err := os.Create(file)
if err != nil {
value.Errorf("%s", err)
}
defer fd.Close()
buf := bufio.NewWriter(fd)
defer buf.Flush()
out = buf
}
// Configuration settings. We will set the base below,
// after we have printed all numbers in base 10.
fmt.Fprintf(out, ")prec %d\n", conf.FloatPrec())
ibase, obase := conf.Base()
fmt.Fprintf(out, ")maxbits %d\n", conf.MaxBits())
fmt.Fprintf(out, ")maxdigits %d\n", conf.MaxDigits())
fmt.Fprintf(out, ")origin %d\n", conf.Origin())
fmt.Fprintf(out, ")prompt %q\n", conf.Prompt())
fmt.Fprintf(out, ")format %q\n", conf.Format())
// Ops.
printed := make(map[exec.OpDef]bool)
for _, def := range c.Defs {
var fn *exec.Function
if def.IsBinary {
fn = c.BinaryFn[def.Name]
} else {
fn = c.UnaryFn[def.Name]
}
for _, ref := range references(c, fn.Body) {
if !printed[ref] {
if ref.IsBinary {
fmt.Fprintf(out, "op _ %s _\n", ref.Name)
} else {
fmt.Fprintf(out, "op %s _\n", ref.Name)
}
printed[ref] = true
}
}
printed[def] = true
fmt.Fprintln(out, fn)
}
// Global variables.
syms := c.Stack[0]
if len(syms) > 0 {
// Set the base strictly to 10 for output.
fmt.Fprintf(out, "# Set base 10 for parsing numbers.\n)base 10\n")
// Sort the names for consistent output.
sorted := sortSyms(syms)
for _, sym := range sorted {
// pi and e are generated
if sym.name == "pi" || sym.name == "e" {
continue
}
fmt.Fprintf(out, "%s = ", sym.name)
put(out, sym.val)
fmt.Fprint(out, "\n")
}
}
// Now we can set the base.
fmt.Fprintf(out, ")ibase %d\n", ibase)
fmt.Fprintf(out, ")obase %d\n", obase)
}
func (f BigFloat) Sprint(conf *config.Config) string {
var mant big.Float
exp := f.Float.MantExp(&mant)
positive := 1
if exp < 0 {
positive = 0
exp = -exp
}
verb, prec := byte('g'), 12
format := conf.Format()
if format != "" {
v, p, ok := conf.FloatFormat()
if ok {
verb, prec = v, p
}
}
// Printing huge floats can be very slow using
// big.Float's native methods; see issue #11068.
// For example 1e5000000 takes a minute of CPU time just
// to print. The code below is instantaneous, by rescaling
// first. It is however less feature-complete.
// (Big ints are problematic too, but if you print 1e50000000
// as an integer you probably won't be surprised it's slow.)
if fastFloatPrint && exp > 10000 {
// We always use %g to print the fraction, and it will
// never have an exponent, but if the format is %E we
// need to use a capital E.
eChar := 'e'
if verb == 'E' || verb == 'G' {
eChar = 'E'
}
fexp := newF(conf).SetInt64(int64(exp))
fexp.Mul(fexp, floatLog2)
fexp.Quo(fexp, floatLog10)
// We now have a floating-point base 10 exponent.
// Break into the integer part and the fractional part.
// The integer part is what we will show.
// The 10**(fractional part) will be multiplied back in.
iexp, _ := fexp.Int(nil)
fraction := fexp.Sub(fexp, newF(conf).SetInt(iexp))
// Now compute 10**(fractional part).
// Fraction is in base 10. Move it to base e.
fraction.Mul(fraction, floatLog10)
scale := exponential(conf, fraction)
if positive > 0 {
mant.Mul(&mant, scale)
} else {
mant.Quo(&mant, scale)
}
ten := newF(conf).SetInt64(10)
i64exp := iexp.Int64()
// For numbers not too far from one, print without the E notation.
// Shouldn't happen (exp must be large to get here) but just
// in case, we keep this around.
if -4 <= i64exp && i64exp <= 11 {
if i64exp > 0 {
for i := 0; i < int(i64exp); i++ {
mant.Mul(&mant, ten)
}
} else {
for i := 0; i < int(-i64exp); i++ {
mant.Quo(&mant, ten)
}
}
return fmt.Sprintf("%g\n", &mant)
} else {
sign := ""
if mant.Sign() < 0 {
sign = "-"
mant.Neg(&mant)
}
// If it has a leading zero, rescale.
digits := mant.Text('g', prec)
for digits[0] == '0' {
mant.Mul(&mant, ten)
if positive > 0 {
i64exp--
} else {
i64exp++
}
digits = mant.Text('g', prec)
}
return fmt.Sprintf("%s%s%c%c%d", sign, digits, eChar, "-+"[positive], i64exp)
}
}
return f.Float.Text(verb, prec)
}