/
reduce.go
201 lines (175 loc) · 6.2 KB
/
reduce.go
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package sexp
import "reflect"
type Reducible interface {
Reduce(seed, function interface{}) (r interface{}, ok bool)
}
func reduceIndexedReader(c IndexedReader, seed, f interface{}) (r interface{}, ok bool) {
end := c.Len()
switch f := f.(type) {
case func(interface{}, interface{}) interface{}: for i := 0; i < end; i++ {
seed = f(seed, c.At(i))
}
ok = true
default: if f := reflect.ValueOf(f); f.Kind() == reflect.Func {
switch f.Type().NumIn() {
case 2: for i := 0; i < end; i++ {
f.Call(valueslice(i, c.At(i)))
}
ok = true
}
}
}
return
}
func reduceMappedReader(c MappedReader, seed, function interface{}) (r interface{}, ok bool) {
return
}
func reduceIterable(container Iterable, seed, f interface{}) (r interface{}, ok bool) {
switch f := f.(type) {
case func(interface{}, interface{}) interface{}: r = seed
Each(container, func(x interface{}) {
r = f(r, x)
})
ok = true
}
return
}
func reduceSlice(s reflect.Value, seed, f interface{}) (r interface{}, ok bool) {
end := s.Len()
switch f := f.(type) {
case func(interface{}, interface{}) interface{}: v := reflect.New(s.Type().Elem()).Elem()
v.Set(reflect.ValueOf(seed))
for i := 0; i < end; i++ {
v = reflect.ValueOf(f(v.Interface(), s.Index(i).Interface()))
}
r = v.Interface()
ok = true
default: if f := reflect.ValueOf(f); f.Kind() == reflect.Func {
v := reflect.New(s.Type().Elem()).Elem()
v.Set(reflect.ValueOf(seed))
switch f.Type().NumIn() {
case 2: for i, end := 0, s.Len(); i < end; i++ {
v = f.Call([]reflect.Value{ v, s.Index(i) })[0]
}
ok = true
}
if ok {
r = v.Interface()
}
}
}
return
}
func reduceMap(m reflect.Value, seed, f interface{}) (r interface{}, ok bool) {
switch f := f.(type) {
case func(interface{}, interface{}) interface{}: v := reflect.New(m.Type().Elem()).Elem()
v.Set(reflect.ValueOf(seed))
for iter := m.MapRange(); iter.Next(); {
v = reflect.ValueOf(f(v.Interface(), iter.Value().Interface()))
}
r = v.Interface()
ok = true
default: if f := reflect.ValueOf(f); f.Kind() == reflect.Func {
v := reflect.New(m.Type().Elem()).Elem()
v.Set(reflect.ValueOf(seed))
switch f.Type().NumIn() {
case 2: for iter := m.MapRange(); iter.Next(); {
v = f.Call([]reflect.Value{ v, iter.Value() })[0]
}
ok = true
}
if ok {
r = v.Interface()
}
}
}
return
}
func reduceChan(c reflect.Value, seed, f interface{}) (r interface{}, ok bool) {
switch f := f.(type) {
case func(interface{}, interface{}) interface{}: v := reflect.New(c.Type().Elem()).Elem()
v.Set(reflect.ValueOf(seed))
for {
if x, open := c.Recv(); open {
v = reflect.ValueOf(f(v.Interface(), x))
} else {
break
}
}
r = v.Interface()
ok = true
default: if f := reflect.ValueOf(f); f.Kind() == reflect.Func {
v := reflect.New(c.Type().Elem()).Elem()
v.Set(reflect.ValueOf(seed))
switch f.Type().NumIn() {
case 2: for {
if x, open := c.Recv(); open {
v = f.Call([]reflect.Value{ v, x })[0]
} else {
break
}
}
ok = true
}
if ok {
r = v.Interface()
}
}
}
return
}
func reduceFunction(g reflect.Value, seed, f interface{}) (r interface{}, ok bool) {
if t := g.Type(); t.NumOut() == 2 {
switch t.NumIn() {
case 0: switch f := f.(type) {
case func(interface{}) interface{}: v := reflect.New(g.Type().Out(0)).Elem()
v.Set(reflect.ValueOf(seed))
for x := g.Call([]reflect.Value{}); !x[1].Bool(); x = g.Call([]reflect.Value{}) {
v = reflect.ValueOf(f(x[0].Interface()))
}
r = v.Interface()
ok = true
}
case 1: count := 0
switch f := f.(type) {
case func(interface{}) interface{}: v := reflect.New(g.Type().Out(0)).Elem()
v.Set(reflect.ValueOf(seed))
for x := g.Call(valueslice(count)); !x[1].Bool(); x = g.Call(valueslice(count)) {
v = reflect.ValueOf(f(x[0].Interface()))
count++
}
r = v.Interface()
ok = true
}
}
}
return
}
func reduce(container, seed, f interface{}) (r interface{}, ok bool) {
switch c := reflect.ValueOf(container); c.Kind() {
case reflect.Invalid: r, ok = seed, true
case reflect.Slice: r, ok = reduceSlice(c, seed, f)
case reflect.Map: r, ok = reduceMap(c, seed, f)
case reflect.Chan: r, ok = reduceChan(c, seed, f)
case reflect.Func: r, ok = reduceFunction(c, seed, f)
}
return
}
func Reduce(container, seed interface{}, f interface{}) (r interface{}, ok bool) {
switch c := container.(type) {
case Reducible: println("reducible")
r, ok = c.Reduce(seed, f)
case IndexedReader: println("IndexedReader")
r, ok = reduceIndexedReader(c, seed, f)
case MappedReader: println("MappedReader")
r, ok = reduceMappedReader(c, seed, f)
case Iterable: println("Iterable")
r, ok = reduceIterable(c, seed, f)
default: switch c := reflect.ValueOf(container); c.Kind() {
case reflect.Invalid: r, ok = seed, true
case reflect.Slice: r, ok = reduceSlice(c, seed, f)
case reflect.Map: r, ok = reduceMap(c, seed, f)
}
}
return
}