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iterable.go
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145 lines (120 loc) · 2 KB
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package core
import (
"io"
"reflect"
)
type Iterable interface {
Next() bool
Key() any
Value() any
}
type ReaderIterable struct {
reader io.Reader
buffer []byte
pos int
}
func (r *ReaderIterable) Key() any {
if r.pos > 0 {
return r.pos - 1
}
return nil
}
func (r *ReaderIterable) Next() bool {
if r.pos < len(r.buffer) {
r.pos++
return true
}
buf := make([]byte, 1)
n, err := r.reader.Read(buf)
if n > 0 {
r.buffer = append(r.buffer, buf[0])
r.pos++
return true
}
closer, ok := r.reader.(io.Closer)
if ok {
_ = closer.Close()
}
if err != nil {
if err == io.EOF {
return false
}
panic(err)
}
return false
}
func (r *ReaderIterable) Value() any {
if r.pos > 0 && r.pos <= len(r.buffer) {
return r.buffer[r.pos-1]
}
return nil
}
func (r *ReaderIterable) Reset() {
r.pos = 0
}
type StringIterable struct {
data string
pos int
}
func (s *StringIterable) Key() any {
return s.pos
}
func (s *StringIterable) Next() bool {
if s.pos < len(s.data) {
s.pos++
return true
}
return false
}
func (s *StringIterable) Value() any {
return string(s.data[s.pos-1])
}
func (s *StringIterable) Reset() {
s.pos = 0
}
type SliceIterable struct {
data reflect.Value
pos int
}
func (s *SliceIterable) Key() any {
return s.pos - 1
}
func (s *SliceIterable) Next() bool {
if s.pos < s.data.Len() {
s.pos++
return true
}
return false
}
func (s *SliceIterable) Value() any {
return s.data.Index(s.pos - 1).Interface()
}
func (s *SliceIterable) Reset() {
s.pos = 0
}
type MapIterable struct {
data reflect.Value
pos int
}
func (m *MapIterable) Key() any {
if m.pos > 0 {
return m.data.MapKeys()[m.pos-1].Interface()
}
return nil
}
func (m *MapIterable) Next() bool {
if m.pos < len(m.data.MapKeys()) {
m.pos++
return true
}
return false
}
func (m *MapIterable) Value() any {
if m.pos > 0 && m.pos <= len(m.data.MapKeys()) {
return m.data.MapIndex(m.data.MapKeys()[m.pos-1]).Interface()
}
return nil
}
func (m *MapIterable) Reset() {
m.pos = 0
}