Fast single byte matcher

1 files changed, 15 insertions, 0 deletions

diff --git a/parser.go b/parser.go
index c6d7f9b..2477bb4 100644
--- a/parser.go
+++ b/parser.go
@@ -81,6 +81,21 @@ func ParseString(parser Parserish, input string) (result interface{}, remaining
 }
 
 func Exact(match string) Parser {
+	if len(match) == 1 {
+		matchByte := match[0]
+		return NewParser(match, func(ps *State) Node {
+			ps.AutoWS()
+			if ps.Input[ps.Pos] != matchByte {
+				ps.ErrorHere(match)
+				return Node{}
+			}
+
+			ps.Advance(1)
+
+			return Node{Token: match}
+		})
+	}
+
 	return NewParser(match, func(ps *State) Node {
 		ps.AutoWS()
 		if !strings.HasPrefix(ps.Get(), match) {