Fixed negative number parsing in snbt and added tests

nbt/snbt_scanner.go

@@ -115,9 +115,9 @@ func stateBeginValue(s *scanner, c byte) int {
 		return s.pushParseState(c, parseListValue, scanBeginList)
 	case '"', '\'': // beginning of TAG_String
 		return stateBeginString(s, c)
-	case '-': // beginning of negative number
-		s.step = stateNeg
-		return scanBeginLiteral
+	//case '-': // beginning of negative number
+	//s.step = stateNeg
+	//return scanBeginLiteral
 	default:
 		if isNumber(c) {
 			stateNum0(s, c)

nbt/snbt_scanner_test.go

@@ -43,12 +43,16 @@ func TestSNBT_number(t *testing.T) {
 //go:embed bigTest_test.snbt
 var bigTestSNBT string
 
+//go:embed 1-dimension_codec.snbt
+var dimensionCodecSNBT string
+
 func TestSNBT_compound(t *testing.T) {
 	goods := []string{
 		`{}`, `{name:3.14f}`, `{ "name" : 12345 }`,
 		`{ abc: { }}`, `{ "a b\"c": {}, def: 12345}`,
 		`{ ghi: [], klm: 1}`,
 		bigTestSNBT,
+		dimensionCodecSNBT,
 	}
 	var s scanner
 	for _, str := range goods {