From 9b787b749b7f50494f7dfb0af032e8fb45fac0b3 Mon Sep 17 00:00:00 2001
From: Gregory Eremin <g@erem.in>
Date: Wed, 18 Feb 2015 20:26:13 +0700
Subject: [PATCH] Simpla data buffer

---
 buffer/data.go | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)
 create mode 100644 buffer/data.go

diff --git a/buffer/data.go b/buffer/data.go
new file mode 100644
index 0000000..d408b75
--- /dev/null
+++ b/buffer/data.go
@@ -0,0 +1,34 @@
+package buffer
+
+import (
+	"bytes"
+	"unicode/utf8"
+)
+
+type (
+	DataBuffer struct {
+		input []byte
+		size  uint64
+		pos   uint64
+	}
+)
+
+func NewDataBuffer(input []byte) *DataBuffer {
+	return &DataBuffer{
+		input: input,
+		size:  uint64(len(input)),
+	}
+}
+
+func (b *DataBuffer) Next() rune {
+	var buf bytes.Buffer
+	for b.pos < b.size-1 {
+		buf.WriteByte(b.input[b.pos])
+		b.pos++
+		if ok := utf8.FullRune(buf.Bytes()); ok {
+			r, _ := utf8.DecodeRune(buf.Bytes())
+			return r
+		}
+	}
+	return 0
+}