Add std.exponent and std.mantissa

builtins.go

@@ -404,6 +404,14 @@ var builtinAcos = liftNumeric(math.Acos)
 var builtinAtan = liftNumeric(math.Atan)
 var builtinLog = liftNumeric(math.Log)
 var builtinExp = liftNumeric(math.Exp)
+var builtinMantissa = liftNumeric(func(f float64) float64 {
+	mantissa, _ := math.Frexp(f)
+	return mantissa
+})
+var builtinExponent = liftNumeric(func(f float64) float64 {
+	_, exponent := math.Frexp(f)
+	return float64(exponent)
+})
 
 func liftBitwise(f func(int64, int64) int64) func(*evaluator, potentialValue, potentialValue) (value, error) {
 	return func(e *evaluator, xp, yp potentialValue) (value, error) {
@@ -604,6 +612,8 @@ var funcBuiltins = map[string]evalCallable{
 	"atan":            &UnaryBuiltin{name: "atan", function: builtinAtan, parameters: ast.Identifiers{"x"}},
 	"log":             &UnaryBuiltin{name: "log", function: builtinLog, parameters: ast.Identifiers{"x"}},
 	"exp":             &UnaryBuiltin{name: "exp", function: builtinExp, parameters: ast.Identifiers{"x"}},
+	"mantissa":        &UnaryBuiltin{name: "mantissa", function: builtinMantissa, parameters: ast.Identifiers{"x"}},
+	"exponent":        &UnaryBuiltin{name: "exponent", function: builtinExponent, parameters: ast.Identifiers{"x"}},
 	"pow":             &BinaryBuiltin{name: "pow", function: builtinPow, parameters: ast.Identifiers{"base", "exp"}},
 	"modulo":          &BinaryBuiltin{name: "modulo", function: builtinModulo, parameters: ast.Identifiers{"x", "y"}},
 }

testdata/std.exponent.golden

@@ -0,0 +1 @@
+0

testdata/std.exponent.input

@@ -0,0 +1 @@
+std.exponent(0)

testdata/std.exponent2.golden

@@ -0,0 +1 @@
+6

testdata/std.exponent2.input

@@ -0,0 +1 @@
+std.exponent(42)

testdata/std.exponent3.golden

@@ -0,0 +1 @@
+100

testdata/std.exponent3.input

@@ -0,0 +1 @@
+std.exponent(1e30)

testdata/std.exponent4.golden

@@ -0,0 +1 @@
+31

testdata/std.exponent4.input

@@ -0,0 +1 @@
+std.exponent(1 << 30)

testdata/std.exponent5.golden

@@ -0,0 +1 @@
+36

testdata/std.exponent5.input

@@ -0,0 +1 @@
+std.exponent(42 << 30)

testdata/std.exponent6.golden

@@ -0,0 +1 @@
+-24

testdata/std.exponent6.input

@@ -0,0 +1 @@
+std.exponent(42 / (1 << 30))

testdata/std.exponent7.golden

@@ -0,0 +1 @@
+6

testdata/std.exponent7.input

@@ -0,0 +1 @@
+std.exponent(-42)

testdata/std.mantissa.golden

@@ -0,0 +1 @@
+0

testdata/std.mantissa.input

@@ -0,0 +1 @@
+std.mantissa(0)

testdata/std.mantissa2.golden

@@ -0,0 +1 @@
+0.65625

testdata/std.mantissa2.input

@@ -0,0 +1 @@
+std.mantissa(42)

testdata/std.mantissa3.golden

@@ -0,0 +1 @@
+0.83999999999999997

testdata/std.mantissa3.input

@@ -0,0 +1 @@
+std.mantissa(0.42)

testdata/std.mantissa4.golden

@@ -0,0 +1 @@
+0.5714936956411375

testdata/std.mantissa4.input

@@ -0,0 +1 @@
+std.mantissa(1e100)

testdata/std.mantissa5.golden

@@ -0,0 +1 @@
+0.65625

testdata/std.mantissa5.input

@@ -0,0 +1 @@
+std.mantissa(42 << 30)

testdata/std.mantissa6.golden

@@ -0,0 +1 @@
+0.65625

testdata/std.mantissa6.input

@@ -0,0 +1 @@
+std.mantissa(42 / (1 << 30))

testdata/std.mantissa7.golden

@@ -0,0 +1 @@
+-0.65625

testdata/std.mantissa7.input

@@ -0,0 +1 @@
+std.mantissa(-42)