fix hanging on empty string

glob_test.go

@@ -64,6 +64,9 @@ func TestGlob(t *testing.T) {
 	for _, test := range []test{
 		glob(true, "* ?at * eyes", "my cat has very bright eyes"),
 
+		glob(true, "", ""),
+		glob(false, "", "b"),
+
 		glob(true, "abc", "abc"),
 		glob(true, "a*c", "abc"),
 		glob(true, "a*c", "a12345c"),

lexer.go

@@ -152,7 +152,7 @@ func newLexer(source string) *lexer {
 	l := &lexer{
 		input:       source,
 		state:       lexRaw,
-		items:       make(chan item, len(source)),
+		items:       make(chan item, len(source)+1),
 		termPhrases: make(map[int]int),
 	}
 	return l

lexer_test.go

@@ -9,6 +9,12 @@ func TestLexGood(t *testing.T) {
 		pattern string
 		items   []item
 	}{
+		{
+			pattern: "",
+			items: []item{
+				item{item_eof, ""},
+			},
+		},
 		{
 			pattern: "hello",
 			items: []item{