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data.go
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data.go
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package render_runtime
import (
"fmt"
"image/color"
"math"
"go.starlark.net/starlark"
"tidbyt.dev/pixlet/render"
)
func DataPointElementFromStarlark(value starlark.Value) (float64, error) {
if _, isNone := value.(starlark.NoneType); isNone {
return math.NaN(), nil
} else if result, isFloat := starlark.AsFloat(value); isFloat {
return result, nil
} else {
return math.NaN(), fmt.Errorf("invalid type for data point element 0: %s (expected None or float)", value.Type())
}
}
func DataPointFromStarlark(value starlark.Value) ([2]float64, error) {
result := [2]float64{math.NaN(), math.NaN()}
tuple, isTuple := value.(starlark.Tuple)
if !isTuple {
return result, fmt.Errorf("invalid type for data point: %s (expected a 2-tuple)", value.Type())
} else if tuple.Len() == 0 {
// (NaN, NaN)
return result, nil
} else if tuple.Len() != 2 {
return result, fmt.Errorf("invalid type for data point: %s (expected a 2-tuple)", value.Type())
}
for i := 0; i < len(result); i++ {
if value, err := DataPointElementFromStarlark(tuple.Index(i)); err == nil {
result[i] = value
} else {
return result, err
}
}
return result, nil
}
func DataSeriesFromStarlark(list *starlark.List) ([][2]float64, error) {
result := make([][2]float64, 0)
for i := 0; i < list.Len(); i++ {
if val, err := DataPointFromStarlark(list.Index(i)); err == nil {
result = append(result, val)
} else {
return nil, err
}
}
return result, nil
}
func WeightsFromStarlark(list *starlark.List) ([]float64, error) {
result := make([]float64, 0)
for i := 0; i < list.Len(); i++ {
if val, err := DataPointElementFromStarlark(list.Index(i)); err == nil {
result = append(result, val)
} else {
return nil, err
}
}
return result, nil
}
func ColorSeriesFromStarlark(list *starlark.List) ([]color.Color, error) {
result := make([]color.Color, 0)
for i := 0; i < list.Len(); i++ {
c := list.Index(i)
switch v := c.(type) {
case starlark.String:
c, err := render.ParseColor(v.GoString())
if err != nil {
return nil, fmt.Errorf("colors[%v] is not a valid hex string: %+v", i, c)
}
result = append(result, c)
default:
return nil, fmt.Errorf("colors[%v] is not a valid string", i)
}
}
return result, nil
}