tsuz/go-pine

package pine

import (
    "fmt"
)

// operationConst operates on a and b ValueSeries using op function. use ns as a unique cache identifier
func operationConst(a ValueSeries, ns string, op func(a float64) float64, cache bool) ValueSeries {
    key := fmt.Sprintf("operationconst:%s:%s", a.ID(), ns)
    dest := getCache(key)
    if dest == nil {
        dest = NewValueSeries()
    }

    firstaVal := operationGetStart(a, dest)

    // nowhere to start
    if firstaVal == nil {
        // propagate current pointer if needed
        propagateCurrent(a, dest)

        return dest
    }

    f := firstaVal
    for {
        if f == nil {
            break
        }

        dest.Set(f.t, op(f.v))

        f = f.next
    }

    propagateCurrent(a, dest)

    if cache {
        setCache(key, dest)
    }

    return dest
}