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funcs.go
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funcs.go
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package mathexp
import (
"math"
"github.com/grafana/grafana/pkg/expr/mathexp/parse"
)
var builtins = map[string]parse.Func{
"abs": {
Args: []parse.ReturnType{parse.TypeVariantSet},
VariantReturn: true,
F: abs,
},
"log": {
Args: []parse.ReturnType{parse.TypeVariantSet},
VariantReturn: true,
F: log,
},
"nan": {
Return: parse.TypeScalar,
F: nan,
},
"is_nan": {
Args: []parse.ReturnType{parse.TypeVariantSet},
VariantReturn: true,
F: isNaN,
},
"inf": {
Return: parse.TypeScalar,
F: inf,
},
"infn": {
Return: parse.TypeScalar,
F: infn,
},
"is_inf": {
Args: []parse.ReturnType{parse.TypeVariantSet},
VariantReturn: true,
F: isInf,
},
"null": {
Return: parse.TypeScalar,
F: null,
},
"is_null": {
Args: []parse.ReturnType{parse.TypeVariantSet},
VariantReturn: true,
F: isNull,
},
"is_number": {
Args: []parse.ReturnType{parse.TypeVariantSet},
VariantReturn: true,
F: isNumber,
},
"round": {
Args: []parse.ReturnType{parse.TypeVariantSet},
VariantReturn: true,
F: round,
},
"ceil": {
Args: []parse.ReturnType{parse.TypeVariantSet},
VariantReturn: true,
F: ceil,
},
"floor": {
Args: []parse.ReturnType{parse.TypeVariantSet},
VariantReturn: true,
F: floor,
},
}
// abs returns the absolute value for each result in NumberSet, SeriesSet, or Scalar
func abs(e *State, varSet Results) (Results, error) {
newRes := Results{}
for _, res := range varSet.Values {
newVal, err := perFloat(e, res, math.Abs)
if err != nil {
return newRes, err
}
newRes.Values = append(newRes.Values, newVal)
}
return newRes, nil
}
// log returns the natural logarithm value for each result in NumberSet, SeriesSet, or Scalar
func log(e *State, varSet Results) (Results, error) {
newRes := Results{}
for _, res := range varSet.Values {
newVal, err := perFloat(e, res, math.Log)
if err != nil {
return newRes, err
}
newRes.Values = append(newRes.Values, newVal)
}
return newRes, nil
}
// isNaN returns 1 if the value for each result in NumberSet, SeriesSet, or Scalar is NaN, else 0.
func isNaN(e *State, varSet Results) (Results, error) {
newRes := Results{}
for _, res := range varSet.Values {
newVal, err := perFloat(e, res, func(f float64) float64 {
if math.IsNaN(f) {
return 1
}
return 0
})
if err != nil {
return newRes, err
}
newRes.Values = append(newRes.Values, newVal)
}
return newRes, nil
}
// isInf returns 1 if the value for each result in NumberSet, SeriesSet, or Scalar is a
// positive or negative Inf, else 0.
func isInf(e *State, varSet Results) (Results, error) {
newRes := Results{}
for _, res := range varSet.Values {
newVal, err := perFloat(e, res, func(f float64) float64 {
if math.IsInf(f, 0) {
return 1
}
return 0
})
if err != nil {
return newRes, err
}
newRes.Values = append(newRes.Values, newVal)
}
return newRes, nil
}
// nan returns a scalar nan value
func nan(e *State) Results {
aNaN := math.NaN()
return NewScalarResults(e.RefID, &aNaN)
}
// inf returns a scalar positive infinity value
func inf(e *State) Results {
aInf := math.Inf(0)
return NewScalarResults(e.RefID, &aInf)
}
// infn returns a scalar negative infinity value
func infn(e *State) Results {
aInf := math.Inf(-1)
return NewScalarResults(e.RefID, &aInf)
}
// null returns a null scalar value
func null(e *State) Results {
return NewScalarResults(e.RefID, nil)
}
// isNull returns 1 if the value for each result in NumberSet, SeriesSet, or Scalar is null, else 0.
func isNull(e *State, varSet Results) (Results, error) {
newRes := Results{}
for _, res := range varSet.Values {
newVal, err := perNullableFloat(e, res, func(f *float64) *float64 {
nF := float64(0)
if f == nil {
nF = 1
}
return &nF
})
if err != nil {
return newRes, err
}
newRes.Values = append(newRes.Values, newVal)
}
return newRes, nil
}
// isNumber returns 1 if the value for each result in NumberSet, SeriesSet, or Scalar is a real number, else 0.
// Therefore 0 is returned if the value Inf+, Inf-, NaN, or Null.
func isNumber(e *State, varSet Results) (Results, error) {
newRes := Results{}
for _, res := range varSet.Values {
newVal, err := perNullableFloat(e, res, func(f *float64) *float64 {
nF := float64(1)
if f == nil || math.IsInf(*f, 0) || math.IsNaN(*f) {
nF = 0
}
return &nF
})
if err != nil {
return newRes, err
}
newRes.Values = append(newRes.Values, newVal)
}
return newRes, nil
}
// perFloat passes the non-null value of a Scalar/Number or each value point of a Series to floatF.
// The return Value type will be the same type provided to function, (e.g. a Series input returns a series).
// If input values are null the function is not called and NaN is returned for each value.
func perFloat(e *State, val Value, floatF func(x float64) float64) (Value, error) {
var newVal Value
switch val.Type() {
case parse.TypeNumberSet:
n := NewNumber(e.RefID, val.GetLabels())
f := val.(Number).GetFloat64Value()
nF := math.NaN()
if f != nil {
nF = floatF(*f)
}
n.SetValue(&nF)
newVal = n
case parse.TypeScalar:
f := val.(Scalar).GetFloat64Value()
nF := math.NaN()
if f != nil {
nF = floatF(*f)
}
newVal = NewScalar(e.RefID, &nF)
case parse.TypeSeriesSet:
resSeries := val.(Series)
newSeries := NewSeries(e.RefID, resSeries.GetLabels(), resSeries.Len())
for i := 0; i < resSeries.Len(); i++ {
t, f := resSeries.GetPoint(i)
nF := math.NaN()
if f != nil {
nF = floatF(*f)
}
newSeries.SetPoint(i, t, &nF)
}
newVal = newSeries
default:
// TODO: Should we deal with TypeString, TypeVariantSet?
}
return newVal, nil
}
// perNullableFloat is like perFloat, but takes and returns float pointers instead of floats.
// This is for instead for functions that need specific null handling.
// The input float pointer should not be modified in the floatF func.
func perNullableFloat(e *State, val Value, floatF func(x *float64) *float64) (Value, error) {
var newVal Value
switch val.Type() {
case parse.TypeNumberSet:
n := NewNumber(e.RefID, val.GetLabels())
f := val.(Number).GetFloat64Value()
n.SetValue(floatF(f))
newVal = n
case parse.TypeScalar:
f := val.(Scalar).GetFloat64Value()
newVal = NewScalar(e.RefID, floatF(f))
case parse.TypeSeriesSet:
resSeries := val.(Series)
newSeries := NewSeries(e.RefID, resSeries.GetLabels(), resSeries.Len())
for i := 0; i < resSeries.Len(); i++ {
t, f := resSeries.GetPoint(i)
newSeries.SetPoint(i, t, floatF(f))
}
newVal = newSeries
default:
// TODO: Should we deal with TypeString, TypeVariantSet?
}
return newVal, nil
}
// round returns the rounded value for each result in NumberSet, SeriesSet, or Scalar
func round(e *State, varSet Results) (Results, error) {
newRes := Results{}
for _, res := range varSet.Values {
newVal, err := perFloat(e, res, math.Round)
if err != nil {
return newRes, err
}
newRes.Values = append(newRes.Values, newVal)
}
return newRes, nil
}
// ceil returns the rounded up value for each result in NumberSet, SeriesSet, or Scalar
func ceil(e *State, varSet Results) (Results, error) {
newRes := Results{}
for _, res := range varSet.Values {
newVal, err := perFloat(e, res, math.Ceil)
if err != nil {
return newRes, err
}
newRes.Values = append(newRes.Values, newVal)
}
return newRes, nil
}
// floor returns the rounded down value for each result in NumberSet, SeriesSet, or Scalar
func floor(e *State, varSet Results) (Results, error) {
newRes := Results{}
for _, res := range varSet.Values {
newVal, err := perFloat(e, res, math.Floor)
if err != nil {
return newRes, err
}
newRes.Values = append(newRes.Values, newVal)
}
return newRes, nil
}