Fix parsing of ".E0" input

parser.go

@@ -297,7 +297,7 @@ func (p *parsing) parseNumber() bool {
 				if start == -1 { // floats can be started from a pointer
 					start = p.pos
 				}
-			} else if !(nextByte == 'e' || nextByte == 'E' || nextByte == 0) {
+			} else if !((nextByte == 'e' || nextByte == 'E') && hasNumber) && nextByte != 0 {
 				break
 			}
 			floatTraitPos = p.pos

testdata/fuzz/FuzzStream/0989a2a2ef3fb8ff

@@ -0,0 +1,2 @@
+go test fuzz v1
+string(".E0")

tokenizer_test.go

@@ -158,6 +158,11 @@ func TestTokenizeEdgeCases(t *testing.T) {
 			}},
 			{"\x00", []Token{ // https://github.com/bzick/tokenizer/issues/28
 			}},
+			{".E0", []Token{ // https://github.com/bzick/tokenizer/issues/42
+				{key: TokenUnknown, value: s2b("."), offset: 0, line: 1, id: 0},
+				{key: TokenKeyword, value: s2b("E"), offset: 1, line: 1, id: 1},
+				{key: TokenInteger, value: s2b("0"), offset: 2, line: 1, id: 2},
+			}},
 		}
 		for _, v := range data1 {
 			t.Run(v.str, func(t *testing.T) {
@@ -389,14 +394,14 @@ func FuzzStream(f *testing.F) {
 
 		stream := tokenizer.ParseStream(buffer, 100)
 		var actual []byte
+		var tokens []*Token
 		for stream.IsValid() {
 			current := stream.CurrentToken()
-			// t.Logf("%#v", current)
+			tokens = append(tokens, current)
 			actual = append(actual, current.Indent()...)
 			actual = append(actual, current.Value()...)
 			stream.GoNext()
 		}
-		// t.Logf("%#v", stream.CurrentToken())
 
 		// As we only concatenate the indents of each token, the trailing
 		// whitespaces and token separators are lost, so we trim these
@@ -405,6 +410,7 @@ func FuzzStream(f *testing.F) {
 		expected := bytes.TrimRight(origBytes, trimset)
 		actual = bytes.TrimRight(actual, trimset)
 		if !bytes.Equal(expected, actual) {
+			t.Log(tokens)
 			t.Errorf("input:\n%q\nexpected:\n%q\nactual:\n%q", orig, expected, actual)
 		}
 	})