Stream buffer

buffer/stream.go

@@ -0,0 +1,37 @@
+package buffer
+
+import (
+	"bytes"
+	"io"
+	"unicode/utf8"
+)
+
+type (
+	StreamBuffer struct {
+		input io.Reader
+	}
+)
+
+func NewStreamBuffer(input io.Reader) *StreamBuffer {
+	return &StreamBuffer{
+		input: input,
+	}
+}
+
+func (b *StreamBuffer) Next() rune {
+	var (
+		buf bytes.Buffer
+	)
+	for {
+		rbuf := make([]byte, 1)
+		if n, err := b.input.Read(rbuf); n != 1 || err != nil {
+			return 0
+		}
+		buf.Write(rbuf)
+		if ok := utf8.FullRune(buf.Bytes()); ok {
+			r, _ := utf8.DecodeRune(buf.Bytes())
+			return r
+		}
+	}
+	return 0
+}