// Sum
func SumFunc(ctx expr.EvalContext, vals ...value.Value) (value.NumberValue, bool) {
//u.Debugf("Sum: %v", vals)
sumval := float64(0)
for _, val := range vals {
if val == nil || val.Nil() || val.Err() {
// we don't need to evaluate if nil or error
} else {
switch valValue := val.(type) {
case value.StringsValue:
//u.Debugf("Nice, we have strings: %v", valValue)
for _, sv := range valValue.Value().([]string) {
if fv, ok := value.ToFloat64(reflect.ValueOf(sv)); ok && !math.IsNaN(fv) {
sumval += fv
}
}
default:
//u.Debugf("Sum: %T tofloat=%v %v", value.ToFloat64(val.Rv()), value.ToFloat64(val.Rv()), val.Rv())
if fv, ok := value.ToFloat64(val.Rv()); ok && !math.IsNaN(fv) {
sumval += fv
}
}
}
}
if sumval == float64(0) {
return value.NumberNaNValue, false
}
//u.Debugf("Sum() about to return? %v Nan?%v", sumval, sumval == math.NaN())
return value.NewNumberValue(sumval), true
}
// <= Less Than or Equal
// Must be able to convert items to Floats or else not ok
//
func LeFunc(ctx expr.EvalContext, lv, rv value.Value) (value.BoolValue, bool) {
left, _ := value.ToFloat64(lv.Rv())
right, _ := value.ToFloat64(rv.Rv())
if math.IsNaN(left) || math.IsNaN(right) {
return value.BoolValueFalse, false
}
return value.NewBoolValue(left <= right), true
}
// < Less Than
// Must be able to convert items to Floats or else not ok
//
func LtFunc(ctx expr.EvalContext, lv, rv value.Value) (value.BoolValue, bool) {
left := value.ToFloat64(lv.Rv())
right := value.ToFloat64(rv.Rv())
if left == math.NaN() || right == math.NaN() {
return value.BoolValueFalse, false
}
return value.NewBoolValue(left < right), true
}
// Convert to Number: Best attempt at converting to integer
//
// tonumber("5") => 5.0
// tonumber("5.75") => 5.75
// tonumber("5,555") => 5555
// tonumber("$5") => 5.00
// tonumber("5,555.00") => 5555
//
func ToNumber(ctx expr.EvalContext, item value.Value) (value.NumberValue, bool) {
fv, ok := value.ToFloat64(reflect.ValueOf(item.Value()))
if !ok {
return value.NewNumberValue(0), false
}
return value.NewNumberValue(fv), true
}
// Pow
func PowFunc(ctx EvalContext, val, toPower value.Value) (value.NumberValue, bool) {
//Pow(x, y float64) float64
//u.Infof("powFunc: %T:%v %T:%v ", val, val.Value(), toPower, toPower.Value())
if val.Err() || val.Nil() {
return value.NewNumberValue(0), false
}
if toPower.Err() || toPower.Nil() {
return value.NewNumberValue(0), false
}
fv, pow := value.ToFloat64(val.Rv()), value.ToFloat64(toPower.Rv())
if fv == math.NaN() || pow == math.NaN() {
return value.NewNumberValue(0), false
}
fv = math.Pow(fv, pow)
//u.Infof("pow ??? vals=[%v]", fv, pow)
return value.NewNumberValue(fv), true
}
// creates a new Value with a nil group and given value.
// TODO: convert this to an interface method on nodes called Value()
func numberNodeToValue(t *expr.NumberNode) (v value.Value) {
//u.Debugf("nodeToValue() isFloat?%v", t.IsFloat)
if t.IsInt {
v = value.NewIntValue(t.Int64)
} else if t.IsFloat {
v = value.NewNumberValue(value.ToFloat64(reflect.ValueOf(t.Text)))
} else {
u.Errorf("Could not find type? %v", t.Type())
}
//u.Debugf("return nodeToValue() %v %T arg:%T", v, v, t)
return v
}
// creates a new Value with a nil group and given value.
// TODO: convert this to an interface method on nodes called Value()
func numberNodeToValue(t *expr.NumberNode) (value.Value, bool) {
//u.Debugf("nodeToValue() isFloat?%v", t.IsFloat)
var v value.Value
if t.IsInt {
v = value.NewIntValue(t.Int64)
} else if t.IsFloat {
fv, ok := value.ToFloat64(reflect.ValueOf(t.Text))
if !ok {
u.Warnf("Could not perform numeric conversion for %q", t.Text)
return value.NilValueVal, false
}
v = value.NewNumberValue(fv)
} else {
u.Warnf("Could not find numeric conversion for %v", t.Type())
return value.NilValueVal, false
}
//u.Debugf("return nodeToValue() %v %T arg:%T", v, v, t)
return v, true
}