lib/bytes: add method Peek to Parser

The Peek method take a look on n bytes inside the buffer without
using delimiters.
The returned bytes may empty or have length less than n.

1 files changed, 9 insertions, 0 deletions

diff --git a/lib/bytes/parser.go b/lib/bytes/parser.go
index e5c7addb..b6adc0d8 100644
--- a/lib/bytes/parser.go
+++ b/lib/bytes/parser.go
@@ -40,6 +40,15 @@ func (bp *Parser) Delimiters() []byte {
 	return bytes.Clone(bp.delims)
 }
 
+// Peek take a look on n bytes inside the buffer without using delimiters.
+// The returned bytes may empty or have length less than n.
+func (bp *Parser) Peek(n int) []byte {
+	if bp.x+n > bp.size {
+		return bp.content[bp.x:]
+	}
+	return bp.content[bp.x : bp.x+n]
+}
+
 // Read read a token until one of the delimiters found.
 // If one of delimiter match, it will return it as d.
 // When end of content encountered, the returned token may be not empty but