route/vendor/github.com/zclconf/go-cty/cty/function/stdlib/number.go

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2017-12-02 23:34:35 +00:00
package stdlib
import (
"fmt"
"math/big"
"github.com/zclconf/go-cty/cty"
"github.com/zclconf/go-cty/cty/function"
)
var AbsoluteFunc = function.New(&function.Spec{
Params: []function.Parameter{
{
Name: "num",
Type: cty.Number,
AllowDynamicType: true,
},
},
Type: function.StaticReturnType(cty.Number),
Impl: func(args []cty.Value, retType cty.Type) (cty.Value, error) {
return args[0].Absolute(), nil
},
})
var AddFunc = function.New(&function.Spec{
Params: []function.Parameter{
{
Name: "a",
Type: cty.Number,
AllowDynamicType: true,
},
{
Name: "b",
Type: cty.Number,
AllowDynamicType: true,
},
},
Type: function.StaticReturnType(cty.Number),
Impl: func(args []cty.Value, retType cty.Type) (ret cty.Value, err error) {
// big.Float.Add can panic if the input values are opposing infinities,
// so we must catch that here in order to remain within
// the cty Function abstraction.
defer func() {
if r := recover(); r != nil {
if _, ok := r.(big.ErrNaN); ok {
ret = cty.NilVal
err = fmt.Errorf("can't compute sum of opposing infinities")
} else {
// not a panic we recognize
panic(r)
}
}
}()
return args[0].Add(args[1]), nil
},
})
var SubtractFunc = function.New(&function.Spec{
Params: []function.Parameter{
{
Name: "a",
Type: cty.Number,
AllowDynamicType: true,
},
{
Name: "b",
Type: cty.Number,
AllowDynamicType: true,
},
},
Type: function.StaticReturnType(cty.Number),
Impl: func(args []cty.Value, retType cty.Type) (ret cty.Value, err error) {
// big.Float.Sub can panic if the input values are infinities,
// so we must catch that here in order to remain within
// the cty Function abstraction.
defer func() {
if r := recover(); r != nil {
if _, ok := r.(big.ErrNaN); ok {
ret = cty.NilVal
err = fmt.Errorf("can't subtract infinity from itself")
} else {
// not a panic we recognize
panic(r)
}
}
}()
return args[0].Subtract(args[1]), nil
},
})
var MultiplyFunc = function.New(&function.Spec{
Params: []function.Parameter{
{
Name: "a",
Type: cty.Number,
AllowDynamicType: true,
},
{
Name: "b",
Type: cty.Number,
AllowDynamicType: true,
},
},
Type: function.StaticReturnType(cty.Number),
Impl: func(args []cty.Value, retType cty.Type) (ret cty.Value, err error) {
// big.Float.Mul can panic if the input values are both zero or both
// infinity, so we must catch that here in order to remain within
// the cty Function abstraction.
defer func() {
if r := recover(); r != nil {
if _, ok := r.(big.ErrNaN); ok {
ret = cty.NilVal
err = fmt.Errorf("can't multiply zero by infinity")
} else {
// not a panic we recognize
panic(r)
}
}
}()
return args[0].Multiply(args[1]), nil
},
})
var DivideFunc = function.New(&function.Spec{
Params: []function.Parameter{
{
Name: "a",
Type: cty.Number,
AllowDynamicType: true,
},
{
Name: "b",
Type: cty.Number,
AllowDynamicType: true,
},
},
Type: function.StaticReturnType(cty.Number),
Impl: func(args []cty.Value, retType cty.Type) (ret cty.Value, err error) {
// big.Float.Quo can panic if the input values are both zero or both
// infinity, so we must catch that here in order to remain within
// the cty Function abstraction.
defer func() {
if r := recover(); r != nil {
if _, ok := r.(big.ErrNaN); ok {
ret = cty.NilVal
err = fmt.Errorf("can't divide zero by zero or infinity by infinity")
} else {
// not a panic we recognize
panic(r)
}
}
}()
return args[0].Divide(args[1]), nil
},
})
var ModuloFunc = function.New(&function.Spec{
Params: []function.Parameter{
{
Name: "a",
Type: cty.Number,
AllowDynamicType: true,
},
{
Name: "b",
Type: cty.Number,
AllowDynamicType: true,
},
},
Type: function.StaticReturnType(cty.Number),
Impl: func(args []cty.Value, retType cty.Type) (ret cty.Value, err error) {
// big.Float.Mul can panic if the input values are both zero or both
// infinity, so we must catch that here in order to remain within
// the cty Function abstraction.
defer func() {
if r := recover(); r != nil {
if _, ok := r.(big.ErrNaN); ok {
ret = cty.NilVal
err = fmt.Errorf("can't use modulo with zero and infinity")
} else {
// not a panic we recognize
panic(r)
}
}
}()
return args[0].Modulo(args[1]), nil
},
})
var GreaterThanFunc = function.New(&function.Spec{
Params: []function.Parameter{
{
Name: "a",
Type: cty.Number,
AllowDynamicType: true,
},
{
Name: "b",
Type: cty.Number,
AllowDynamicType: true,
},
},
Type: function.StaticReturnType(cty.Bool),
Impl: func(args []cty.Value, retType cty.Type) (ret cty.Value, err error) {
return args[0].GreaterThan(args[1]), nil
},
})
var GreaterThanOrEqualToFunc = function.New(&function.Spec{
Params: []function.Parameter{
{
Name: "a",
Type: cty.Number,
AllowDynamicType: true,
},
{
Name: "b",
Type: cty.Number,
AllowDynamicType: true,
},
},
Type: function.StaticReturnType(cty.Bool),
Impl: func(args []cty.Value, retType cty.Type) (ret cty.Value, err error) {
return args[0].GreaterThanOrEqualTo(args[1]), nil
},
})
var LessThanFunc = function.New(&function.Spec{
Params: []function.Parameter{
{
Name: "a",
Type: cty.Number,
AllowDynamicType: true,
},
{
Name: "b",
Type: cty.Number,
AllowDynamicType: true,
},
},
Type: function.StaticReturnType(cty.Bool),
Impl: func(args []cty.Value, retType cty.Type) (ret cty.Value, err error) {
return args[0].LessThan(args[1]), nil
},
})
var LessThanOrEqualToFunc = function.New(&function.Spec{
Params: []function.Parameter{
{
Name: "a",
Type: cty.Number,
AllowDynamicType: true,
},
{
Name: "b",
Type: cty.Number,
AllowDynamicType: true,
},
},
Type: function.StaticReturnType(cty.Bool),
Impl: func(args []cty.Value, retType cty.Type) (ret cty.Value, err error) {
return args[0].LessThanOrEqualTo(args[1]), nil
},
})
var NegateFunc = function.New(&function.Spec{
Params: []function.Parameter{
{
Name: "num",
Type: cty.Number,
AllowDynamicType: true,
},
},
Type: function.StaticReturnType(cty.Number),
Impl: func(args []cty.Value, retType cty.Type) (cty.Value, error) {
return args[0].Negate(), nil
},
})
var MinFunc = function.New(&function.Spec{
Params: []function.Parameter{},
VarParam: &function.Parameter{
Name: "numbers",
Type: cty.Number,
AllowDynamicType: true,
},
Type: function.StaticReturnType(cty.Number),
Impl: func(args []cty.Value, retType cty.Type) (cty.Value, error) {
if len(args) == 0 {
return cty.NilVal, fmt.Errorf("must pass at least one number")
}
min := cty.PositiveInfinity
for _, num := range args {
if num.LessThan(min).True() {
min = num
}
}
return min, nil
},
})
var MaxFunc = function.New(&function.Spec{
Params: []function.Parameter{},
VarParam: &function.Parameter{
Name: "numbers",
Type: cty.Number,
AllowDynamicType: true,
},
Type: function.StaticReturnType(cty.Number),
Impl: func(args []cty.Value, retType cty.Type) (cty.Value, error) {
if len(args) == 0 {
return cty.NilVal, fmt.Errorf("must pass at least one number")
}
max := cty.NegativeInfinity
for _, num := range args {
if num.GreaterThan(max).True() {
max = num
}
}
return max, nil
},
})
var IntFunc = function.New(&function.Spec{
Params: []function.Parameter{
{
Name: "num",
Type: cty.Number,
AllowDynamicType: true,
},
},
Type: function.StaticReturnType(cty.Number),
Impl: func(args []cty.Value, retType cty.Type) (cty.Value, error) {
bf := args[0].AsBigFloat()
if bf.IsInt() {
return args[0], nil
}
bi, _ := bf.Int(nil)
bf = (&big.Float{}).SetInt(bi)
return cty.NumberVal(bf), nil
},
})
// Absolute returns the magnitude of the given number, without its sign.
// That is, it turns negative values into positive values.
func Absolute(num cty.Value) (cty.Value, error) {
return AbsoluteFunc.Call([]cty.Value{num})
}
// Add returns the sum of the two given numbers.
func Add(a cty.Value, b cty.Value) (cty.Value, error) {
return AddFunc.Call([]cty.Value{a, b})
}
// Subtract returns the difference between the two given numbers.
func Subtract(a cty.Value, b cty.Value) (cty.Value, error) {
return SubtractFunc.Call([]cty.Value{a, b})
}
// Multiply returns the product of the two given numbers.
func Multiply(a cty.Value, b cty.Value) (cty.Value, error) {
return MultiplyFunc.Call([]cty.Value{a, b})
}
// Divide returns a divided by b, where both a and b are numbers.
func Divide(a cty.Value, b cty.Value) (cty.Value, error) {
return DivideFunc.Call([]cty.Value{a, b})
}
// Negate returns the given number multipled by -1.
func Negate(num cty.Value) (cty.Value, error) {
return NegateFunc.Call([]cty.Value{num})
}
// LessThan returns true if a is less than b.
func LessThan(a cty.Value, b cty.Value) (cty.Value, error) {
return LessThanFunc.Call([]cty.Value{a, b})
}
// LessThanOrEqualTo returns true if a is less than b.
func LessThanOrEqualTo(a cty.Value, b cty.Value) (cty.Value, error) {
return LessThanOrEqualToFunc.Call([]cty.Value{a, b})
}
// GreaterThan returns true if a is less than b.
func GreaterThan(a cty.Value, b cty.Value) (cty.Value, error) {
return GreaterThanFunc.Call([]cty.Value{a, b})
}
// GreaterThanOrEqualTo returns true if a is less than b.
func GreaterThanOrEqualTo(a cty.Value, b cty.Value) (cty.Value, error) {
return GreaterThanOrEqualToFunc.Call([]cty.Value{a, b})
}
// Modulo returns the remainder of a divided by b under integer division,
// where both a and b are numbers.
func Modulo(a cty.Value, b cty.Value) (cty.Value, error) {
return ModuloFunc.Call([]cty.Value{a, b})
}
// Min returns the minimum number from the given numbers.
func Min(numbers ...cty.Value) (cty.Value, error) {
return MinFunc.Call(numbers)
}
// Max returns the maximum number from the given numbers.
func Max(numbers ...cty.Value) (cty.Value, error) {
return MaxFunc.Call(numbers)
}
// Int removes the fractional component of the given number returning an
// integer representing the whole number component, rounding towards zero.
// For example, -1.5 becomes -1.
//
// If an infinity is passed to Int, an error is returned.
func Int(num cty.Value) (cty.Value, error) {
if num == cty.PositiveInfinity || num == cty.NegativeInfinity {
return cty.NilVal, fmt.Errorf("can't truncate infinity to an integer")
}
return IntFunc.Call([]cty.Value{num})
}