From c4c88aa65cfac511fcc830a7807da6ac9bde4d0a Mon Sep 17 00:00:00 2001
From: Luke Shumaker <lukeshu@lukeshu.com>
Date: Sat, 18 Feb 2023 17:55:32 -0700
Subject: decode_scan: Add a bunch of tests

---
 decode_scan_test.go | 92 +++++++++++++++++++++++++++++++++++++++++++++--------
 1 file changed, 79 insertions(+), 13 deletions(-)

(limited to 'decode_scan_test.go')

diff --git a/decode_scan_test.go b/decode_scan_test.go
index 1d61157..eaf2f37 100644
--- a/decode_scan_test.go
+++ b/decode_scan_test.go
@@ -106,19 +106,16 @@ func TestRuneTypeScanner(t *testing.T) {
 			{0, 0, jsonparse.RuneTypeEOF, nil},
 			{0, 0, jsonparse.RuneTypeEOF, nil},
 		}},
-		"unread-eof": {`{"foo": 12.0}`, ``, []ReadRuneTypeResult{
-			{'{', 1, jsonparse.RuneTypeObjectBeg, nil},
-			{'"', 1, jsonparse.RuneTypeStringBeg, nil},
-			{'f', 1, jsonparse.RuneTypeStringChar, nil},
-			{'o', 1, jsonparse.RuneTypeStringChar, nil},
-			{'o', 1, jsonparse.RuneTypeStringChar, nil},
-			{'"', 1, jsonparse.RuneTypeStringEnd, nil},
-			{':', 1, jsonparse.RuneTypeObjectColon, nil},
+		"unread-eof": {`[1,2]`, ``, []ReadRuneTypeResult{
+			{'[', 1, jsonparse.RuneTypeArrayBeg, nil},
 			{'1', 1, jsonparse.RuneTypeNumberIntDig, nil},
+			{',', 1, jsonparse.RuneTypeArrayComma, nil},
+			{0, pushReadBarrier, 0, nil},
 			{'2', 1, jsonparse.RuneTypeNumberIntDig, nil},
-			{'.', 1, jsonparse.RuneTypeNumberFracDot, nil},
-			{'0', 1, jsonparse.RuneTypeNumberFracDig, nil},
-			{'}', 1, jsonparse.RuneTypeObjectEnd, nil},
+			{']', 1, jsonparse.RuneTypeEOF, nil},
+			{0, unreadRune, 0, nil},
+			{0, popReadBarrier, 0, nil},
+			{']', 1, jsonparse.RuneTypeArrayEnd, nil},
 			{0, 0, jsonparse.RuneTypeEOF, nil},
 			{0, unreadRune, 0, ErrInvalidUnreadRune},
 			{0, 0, jsonparse.RuneTypeEOF, nil},
@@ -149,11 +146,32 @@ func TestRuneTypeScanner(t *testing.T) {
 			{']', 1, jsonparse.RuneTypeError, &DecodeSyntaxError{Offset: 4, Err: fmt.Errorf("invalid character %q looking for beginning of value", ']')}},
 			{']', 1, jsonparse.RuneTypeError, &DecodeSyntaxError{Offset: 4, Err: fmt.Errorf("invalid character %q looking for beginning of value", ']')}},
 		}},
-		"multi-value": {`1{}`, `}`, []ReadRuneTypeResult{
+		"multi-value1": {`1{}`, `{}`, []ReadRuneTypeResult{
+			{0, pushReadBarrier, 0, nil},
+			{'1', 1, jsonparse.RuneTypeNumberIntDig, nil},
+			{'{', 1, jsonparse.RuneTypeEOF, nil},
+			{'{', 1, jsonparse.RuneTypeEOF, nil},
+			{'{', 1, jsonparse.RuneTypeEOF, nil},
+			{0, popReadBarrier, 0, nil},
+		}},
+		"multi-value2": {`1{}`, ``, []ReadRuneTypeResult{
+			{0, pushReadBarrier, 0, nil},
 			{'1', 1, jsonparse.RuneTypeNumberIntDig, nil},
 			{'{', 1, jsonparse.RuneTypeEOF, nil},
 			{'{', 1, jsonparse.RuneTypeEOF, nil},
 			{'{', 1, jsonparse.RuneTypeEOF, nil},
+			{0, popReadBarrier, 0, nil},
+			{0, reset, 0, nil},
+			{0, pushReadBarrier, 0, nil},
+			{'{', 1, jsonparse.RuneTypeObjectBeg, nil},
+			{'}', 1, jsonparse.RuneTypeObjectEnd, nil},
+			{0, 0, jsonparse.RuneTypeEOF, nil},
+			{0, 0, jsonparse.RuneTypeEOF, nil},
+			{0, 0, jsonparse.RuneTypeEOF, nil},
+			{0, popReadBarrier, 0, nil},
+			{0, 0, jsonparse.RuneTypeEOF, nil},
+			{0, 0, jsonparse.RuneTypeEOF, nil},
+			{0, 0, jsonparse.RuneTypeEOF, nil},
 		}},
 		"early-eof": {` {`, ``, []ReadRuneTypeResult{
 			{'{', 1, jsonparse.RuneTypeObjectBeg, nil},
@@ -173,6 +191,22 @@ func TestRuneTypeScanner(t *testing.T) {
 			{0, 0, jsonparse.RuneTypeEOF, nil},
 		}},
 		"fragment": {`1,`, ``, []ReadRuneTypeResult{
+			// Disable auto-child.
+			{0, pushReadBarrier, 0, nil},
+			{0, popReadBarrier, 0, nil},
+			// Test main.
+			{'1', 1, jsonparse.RuneTypeNumberIntDig, nil},
+			{',', 1, jsonparse.RuneTypeEOF, nil},
+			{',', 1, jsonparse.RuneTypeEOF, nil},
+			{',', 1, jsonparse.RuneTypeEOF, nil},
+		}},
+		"child-fragment": {`[1,` + `1,`, ``, []ReadRuneTypeResult{
+			// Child prefix.
+			{'[', 1, jsonparse.RuneTypeArrayBeg, nil},
+			{'1', 1, jsonparse.RuneTypeNumberIntDig, nil},
+			{',', 1, jsonparse.RuneTypeArrayComma, nil},
+			{0, pushReadBarrier, 0, nil},
+			// Test main.
 			{'1', 1, jsonparse.RuneTypeNumberIntDig, nil},
 			{',', 1, jsonparse.RuneTypeEOF, nil},
 			{',', 1, jsonparse.RuneTypeEOF, nil},
@@ -198,13 +232,45 @@ func TestRuneTypeScanner(t *testing.T) {
 			{0, 0, jsonparse.RuneTypeEOF, nil},
 			{0, 0, jsonparse.RuneTypeEOF, nil},
 		}},
+		"invalid-number": {`1.2.3`, `.3`, []ReadRuneTypeResult{
+			{'1', 1, jsonparse.RuneTypeNumberIntDig, nil},
+			{'.', 1, jsonparse.RuneTypeNumberFracDot, nil},
+			{'2', 1, jsonparse.RuneTypeNumberFracDig, nil},
+			{'.', 1, jsonparse.RuneTypeEOF, nil},
+			{0, reset, 0, nil},
+			{'.', 1, jsonparse.RuneTypeError, &DecodeSyntaxError{Offset: 3, Err: fmt.Errorf("invalid character %q looking for beginning of value", '.')}},
+		}},
+		"trailing-garbage": {" 42 x", `x`, []ReadRuneTypeResult{
+			{0, pushReadBarrier, 0, nil},
+			{'4', 1, jsonparse.RuneTypeNumberIntDig, nil},
+			{0, unreadRune, 0, nil},
+			{'4', 1, jsonparse.RuneTypeNumberIntDig, nil},
+			{0, unreadRune, 0, nil},
+			{0, pushReadBarrier, 0, nil},
+			{'4', 1, jsonparse.RuneTypeNumberIntDig, nil},
+			{'2', 1, jsonparse.RuneTypeNumberIntDig, nil},
+			{'x', 1, jsonparse.RuneTypeEOF, nil},
+			{0, popReadBarrier, 0, nil},
+			{0, popReadBarrier, 0, nil},
+			{'x', 1, jsonparse.RuneTypeEOF, nil},
+		}},
+		"unread-reset": {`{}`, ``, []ReadRuneTypeResult{
+			{'{', 1, jsonparse.RuneTypeObjectBeg, nil},
+			{0, unreadRune, 0, nil},
+			{0, reset, 0, nil},
+			{'{', 1, jsonparse.RuneTypeObjectBeg, nil},
+			{'}', 1, jsonparse.RuneTypeObjectEnd, nil},
+			{0, 0, jsonparse.RuneTypeEOF, nil},
+			{0, 0, jsonparse.RuneTypeEOF, nil},
+			{0, 0, jsonparse.RuneTypeEOF, nil},
+		}},
 	}
 	func() {
 		childTestcases := make(map[string]runeTypeScannerTestcase)
 		for tcName, tc := range testcases {
 			canChild := true
 			for _, res := range tc.Exp {
-				if res.s == pushReadBarrier {
+				if res.s == pushReadBarrier || res.s == reset {
 					canChild = false
 					break
 				}
-- 
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