/
builtin_math.go
343 lines (291 loc) · 10.4 KB
/
builtin_math.go
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package goscript
import (
"math"
"math/bits"
)
func (r *Runtime) math_abs(call FunctionCall) Value {
return floatToValue(math.Abs(call.Argument(0).ToFloat()))
}
func (r *Runtime) math_acos(call FunctionCall) Value {
return floatToValue(math.Acos(call.Argument(0).ToFloat()))
}
func (r *Runtime) math_acosh(call FunctionCall) Value {
return floatToValue(math.Acosh(call.Argument(0).ToFloat()))
}
func (r *Runtime) math_asin(call FunctionCall) Value {
return floatToValue(math.Asin(call.Argument(0).ToFloat()))
}
func (r *Runtime) math_asinh(call FunctionCall) Value {
return floatToValue(math.Asinh(call.Argument(0).ToFloat()))
}
func (r *Runtime) math_atan(call FunctionCall) Value {
return floatToValue(math.Atan(call.Argument(0).ToFloat()))
}
func (r *Runtime) math_atanh(call FunctionCall) Value {
return floatToValue(math.Atanh(call.Argument(0).ToFloat()))
}
func (r *Runtime) math_atan2(call FunctionCall) Value {
y := call.Argument(0).ToFloat()
x := call.Argument(1).ToFloat()
return floatToValue(math.Atan2(y, x))
}
func (r *Runtime) math_cbrt(call FunctionCall) Value {
return floatToValue(math.Cbrt(call.Argument(0).ToFloat()))
}
func (r *Runtime) math_ceil(call FunctionCall) Value {
return floatToValue(math.Ceil(call.Argument(0).ToFloat()))
}
func (r *Runtime) math_clz32(call FunctionCall) Value {
return intToValue(int64(bits.LeadingZeros32(toUint32(call.Argument(0)))))
}
func (r *Runtime) math_cos(call FunctionCall) Value {
return floatToValue(math.Cos(call.Argument(0).ToFloat()))
}
func (r *Runtime) math_cosh(call FunctionCall) Value {
return floatToValue(math.Cosh(call.Argument(0).ToFloat()))
}
func (r *Runtime) math_exp(call FunctionCall) Value {
return floatToValue(math.Exp(call.Argument(0).ToFloat()))
}
func (r *Runtime) math_expm1(call FunctionCall) Value {
return floatToValue(math.Expm1(call.Argument(0).ToFloat()))
}
func (r *Runtime) math_floor(call FunctionCall) Value {
return floatToValue(math.Floor(call.Argument(0).ToFloat()))
}
func (r *Runtime) math_fround(call FunctionCall) Value {
return floatToValue(float64(float32(call.Argument(0).ToFloat())))
}
func (r *Runtime) math_hypot(call FunctionCall) Value {
var max float64
var hasNaN bool
absValues := make([]float64, 0, len(call.Arguments))
for _, v := range call.Arguments {
arg := nilSafe(v).ToFloat()
if math.IsNaN(arg) {
hasNaN = true
} else {
abs := math.Abs(arg)
if abs > max {
max = abs
}
absValues = append(absValues, abs)
}
}
if math.IsInf(max, 1) {
return _positiveInf
}
if hasNaN {
return _NaN
}
if max == 0 {
return _positiveZero
}
// Kahan summation to avoid rounding errors.
// Normalize the numbers to the largest one to avoid overflow.
var sum, compensation float64
for _, n := range absValues {
n /= max
summand := n*n - compensation
preliminary := sum + summand
compensation = (preliminary - sum) - summand
sum = preliminary
}
return floatToValue(math.Sqrt(sum) * max)
}
func (r *Runtime) math_imul(call FunctionCall) Value {
x := toUint32(call.Argument(0))
y := toUint32(call.Argument(1))
return intToValue(int64(int32(x * y)))
}
func (r *Runtime) math_log(call FunctionCall) Value {
return floatToValue(math.Log(call.Argument(0).ToFloat()))
}
func (r *Runtime) math_log1p(call FunctionCall) Value {
return floatToValue(math.Log1p(call.Argument(0).ToFloat()))
}
func (r *Runtime) math_log10(call FunctionCall) Value {
return floatToValue(math.Log10(call.Argument(0).ToFloat()))
}
func (r *Runtime) math_log2(call FunctionCall) Value {
return floatToValue(math.Log2(call.Argument(0).ToFloat()))
}
func (r *Runtime) math_max(call FunctionCall) Value {
result := math.Inf(-1)
args := call.Arguments
for i, arg := range args {
n := nilSafe(arg).ToFloat()
if math.IsNaN(n) {
args = args[i+1:]
goto NaNLoop
}
result = math.Max(result, n)
}
return floatToValue(result)
NaNLoop:
// All arguments still need to be coerced to number according to the specs.
for _, arg := range args {
nilSafe(arg).ToFloat()
}
return _NaN
}
func (r *Runtime) math_min(call FunctionCall) Value {
result := math.Inf(1)
args := call.Arguments
for i, arg := range args {
n := nilSafe(arg).ToFloat()
if math.IsNaN(n) {
args = args[i+1:]
goto NaNLoop
}
result = math.Min(result, n)
}
return floatToValue(result)
NaNLoop:
// All arguments still need to be coerced to number according to the specs.
for _, arg := range args {
nilSafe(arg).ToFloat()
}
return _NaN
}
func pow(x, y Value) Value {
if x, ok := x.(valueInt); ok {
if y, ok := y.(valueInt); ok && y >= 0 && y < 64 {
if y == 0 {
return intToValue(1)
}
if x == 0 {
return intToValue(0)
}
ip := ipow(int64(x), int64(y))
if ip != 0 {
return intToValue(ip)
}
}
}
xf := x.ToFloat()
yf := y.ToFloat()
if math.Abs(xf) == 1 && math.IsInf(yf, 0) {
return _NaN
}
if xf == 1 && math.IsNaN(yf) {
return _NaN
}
return floatToValue(math.Pow(xf, yf))
}
func (r *Runtime) math_pow(call FunctionCall) Value {
return pow(call.Argument(0), call.Argument(1))
}
func (r *Runtime) math_random(call FunctionCall) Value {
return floatToValue(r.rand())
}
func (r *Runtime) math_round(call FunctionCall) Value {
f := call.Argument(0).ToFloat()
if math.IsNaN(f) {
return _NaN
}
if f == 0 && math.Signbit(f) {
return _negativeZero
}
t := math.Trunc(f)
if f >= 0 {
if f-t >= 0.5 {
return floatToValue(t + 1)
}
} else {
if t-f > 0.5 {
return floatToValue(t - 1)
}
}
return floatToValue(t)
}
func (r *Runtime) math_sign(call FunctionCall) Value {
arg := call.Argument(0)
num := arg.ToFloat()
if math.IsNaN(num) || num == 0 { // this will match -0 too
return arg
}
if num > 0 {
return intToValue(1)
}
return intToValue(-1)
}
func (r *Runtime) math_sin(call FunctionCall) Value {
return floatToValue(math.Sin(call.Argument(0).ToFloat()))
}
func (r *Runtime) math_sinh(call FunctionCall) Value {
return floatToValue(math.Sinh(call.Argument(0).ToFloat()))
}
func (r *Runtime) math_sqrt(call FunctionCall) Value {
return floatToValue(math.Sqrt(call.Argument(0).ToFloat()))
}
func (r *Runtime) math_tan(call FunctionCall) Value {
return floatToValue(math.Tan(call.Argument(0).ToFloat()))
}
func (r *Runtime) math_tanh(call FunctionCall) Value {
return floatToValue(math.Tanh(call.Argument(0).ToFloat()))
}
func (r *Runtime) math_trunc(call FunctionCall) Value {
arg := call.Argument(0)
if i, ok := arg.(valueInt); ok {
return i
}
return floatToValue(math.Trunc(arg.ToFloat()))
}
func (r *Runtime) createMath(val *Object) objectImpl {
m := &baseObject{
class: classObject,
val: val,
extensible: true,
prototype: r.global.ObjectPrototype,
}
m.init()
m._putProp("E", valueFloat(math.E), false, false, false)
m._putProp("LN10", valueFloat(math.Ln10), false, false, false)
m._putProp("LN2", valueFloat(math.Ln2), false, false, false)
m._putProp("LOG10E", valueFloat(math.Log10E), false, false, false)
m._putProp("LOG2E", valueFloat(math.Log2E), false, false, false)
m._putProp("PI", valueFloat(math.Pi), false, false, false)
m._putProp("SQRT1_2", valueFloat(sqrt1_2), false, false, false)
m._putProp("SQRT2", valueFloat(math.Sqrt2), false, false, false)
m._putSym(SymToStringTag, valueProp(asciiString(classMath), false, false, true))
m._putProp("abs", r.newNativeFunc(r.math_abs, nil, "abs", nil, 1), true, false, true)
m._putProp("acos", r.newNativeFunc(r.math_acos, nil, "acos", nil, 1), true, false, true)
m._putProp("acosh", r.newNativeFunc(r.math_acosh, nil, "acosh", nil, 1), true, false, true)
m._putProp("asin", r.newNativeFunc(r.math_asin, nil, "asin", nil, 1), true, false, true)
m._putProp("asinh", r.newNativeFunc(r.math_asinh, nil, "asinh", nil, 1), true, false, true)
m._putProp("atan", r.newNativeFunc(r.math_atan, nil, "atan", nil, 1), true, false, true)
m._putProp("atanh", r.newNativeFunc(r.math_atanh, nil, "atanh", nil, 1), true, false, true)
m._putProp("atan2", r.newNativeFunc(r.math_atan2, nil, "atan2", nil, 2), true, false, true)
m._putProp("cbrt", r.newNativeFunc(r.math_cbrt, nil, "cbrt", nil, 1), true, false, true)
m._putProp("ceil", r.newNativeFunc(r.math_ceil, nil, "ceil", nil, 1), true, false, true)
m._putProp("clz32", r.newNativeFunc(r.math_clz32, nil, "clz32", nil, 1), true, false, true)
m._putProp("cos", r.newNativeFunc(r.math_cos, nil, "cos", nil, 1), true, false, true)
m._putProp("cosh", r.newNativeFunc(r.math_cosh, nil, "cosh", nil, 1), true, false, true)
m._putProp("exp", r.newNativeFunc(r.math_exp, nil, "exp", nil, 1), true, false, true)
m._putProp("expm1", r.newNativeFunc(r.math_expm1, nil, "expm1", nil, 1), true, false, true)
m._putProp("floor", r.newNativeFunc(r.math_floor, nil, "floor", nil, 1), true, false, true)
m._putProp("fround", r.newNativeFunc(r.math_fround, nil, "fround", nil, 1), true, false, true)
m._putProp("hypot", r.newNativeFunc(r.math_hypot, nil, "hypot", nil, 2), true, false, true)
m._putProp("imul", r.newNativeFunc(r.math_imul, nil, "imul", nil, 2), true, false, true)
m._putProp("log", r.newNativeFunc(r.math_log, nil, "log", nil, 1), true, false, true)
m._putProp("log1p", r.newNativeFunc(r.math_log1p, nil, "log1p", nil, 1), true, false, true)
m._putProp("log10", r.newNativeFunc(r.math_log10, nil, "log10", nil, 1), true, false, true)
m._putProp("log2", r.newNativeFunc(r.math_log2, nil, "log2", nil, 1), true, false, true)
m._putProp("max", r.newNativeFunc(r.math_max, nil, "max", nil, 2), true, false, true)
m._putProp("min", r.newNativeFunc(r.math_min, nil, "min", nil, 2), true, false, true)
m._putProp("pow", r.newNativeFunc(r.math_pow, nil, "pow", nil, 2), true, false, true)
m._putProp("random", r.newNativeFunc(r.math_random, nil, "random", nil, 0), true, false, true)
m._putProp("round", r.newNativeFunc(r.math_round, nil, "round", nil, 1), true, false, true)
m._putProp("sign", r.newNativeFunc(r.math_sign, nil, "sign", nil, 1), true, false, true)
m._putProp("sin", r.newNativeFunc(r.math_sin, nil, "sin", nil, 1), true, false, true)
m._putProp("sinh", r.newNativeFunc(r.math_sinh, nil, "sinh", nil, 1), true, false, true)
m._putProp("sqrt", r.newNativeFunc(r.math_sqrt, nil, "sqrt", nil, 1), true, false, true)
m._putProp("tan", r.newNativeFunc(r.math_tan, nil, "tan", nil, 1), true, false, true)
m._putProp("tanh", r.newNativeFunc(r.math_tanh, nil, "tanh", nil, 1), true, false, true)
m._putProp("trunc", r.newNativeFunc(r.math_trunc, nil, "trunc", nil, 1), true, false, true)
return m
}
func (r *Runtime) initMath() {
r.addToGlobal("Math", r.newLazyObject(r.createMath))
}