tsuz/go-pine

package pine

import (
    "fmt"
)

func OperateWithNil(a, b ValueSeries, ns string, op func(a, b *Value) *Value) ValueSeries {
    key := fmt.Sprintf("operationwnil:%s:%s:%s", a.ID(), b.ID(), ns)
    dest := getCache(key)
    if dest == nil {
        dest = NewValueSeries()
    }

    f := a.GetFirst()
    for {
        if f == nil {
            break
        }

        newv := b.Get(f.t)

        if val := op(f, newv); val != nil {
            dest.Set(val.t, val.v)
        }

        f = f.next
    }

    propagateCurrent(b, dest)

    setCache(key, dest)

    return dest
}