decode_scan, jsonparse: Rework the behavior to make a bit more sense

 - decode_scan: Don't have .Reset() re-play an erroring rune
 - decode_Scan: Have RuneTypeEOF always be zero-width
 - jsonparse: Don't replace syntax errors with RuneTypeEOF if there's no barrier

1 files changed, 5 insertions, 1 deletions

diff --git a/internal/jsonparse/parse.go b/internal/jsonparse/parse.go
index d867cbc..06efc8c 100644
--- a/internal/jsonparse/parse.go
+++ b/internal/jsonparse/parse.go
@@ -545,7 +545,11 @@ func (par *Parser) HandleRune(c rune) (RuneType, error) {
 		case 0x0020, 0x000A, 0x000D, 0x0009:
 			return RuneTypeSpace, nil
 		default:
-			return RuneTypeEOF, nil
+			if len(par.barriers) > 0 {
+				return RuneTypeEOF, nil
+			} else {
+				return RuneTypeError, fmt.Errorf("invalid character %q after top-level value", c)
+			}
 		}
 	}
 	switch par.stack[len(par.stack)-1] {