fix: parse signed hex and octal integers

pkg/yqlib/json_test.go

@@ -189,6 +189,38 @@ var jsonScenarios = []formatScenario{
 		expected:     "{\n  \"cat\": \"meow\"\n}\n",
 		scenarioType: "encode",
 	},
+	{
+		description:  "Encode json: signed hex int",
+		skipDoc:      true,
+		input:        `+0x12`,
+		indent:       0,
+		expected:     "18\n",
+		scenarioType: "encode",
+	},
+	{
+		description:  "Encode json: negative hex int",
+		skipDoc:      true,
+		input:        `-0x12`,
+		indent:       0,
+		expected:     "-18\n",
+		scenarioType: "encode",
+	},
+	{
+		description:  "Encode json: signed octal int",
+		skipDoc:      true,
+		input:        `+0o22`,
+		indent:       0,
+		expected:     "18\n",
+		scenarioType: "encode",
+	},
+	{
+		description:  "Encode json: negative octal int",
+		skipDoc:      true,
+		input:        `-0o22`,
+		indent:       0,
+		expected:     "-18\n",
+		scenarioType: "encode",
+	},
 	{
 		description:  "Encode json: simple - in one line",
 		input:        `cat: meow # this is a comment, and it will be dropped.`,

pkg/yqlib/lib.go

@@ -161,12 +161,21 @@ func parseInt64(numberString string) (string, int64, error) {
 		numberString = strings.ReplaceAll(numberString, "_", "")
 	}
 
-	if strings.HasPrefix(numberString, "0x") ||
-		strings.HasPrefix(numberString, "0X") {
-		num, err := strconv.ParseInt(numberString[2:], 16, 64)
+	// A leading +/- sign would hide the 0x/0o prefix below, so peel it off and
+	// hand it back to ParseInt with the digits.
+	sign := ""
+	digits := numberString
+	if len(digits) > 0 && (digits[0] == '+' || digits[0] == '-') {
+		sign = digits[:1]
+		digits = digits[1:]
+	}
+
+	if strings.HasPrefix(digits, "0x") ||
+		strings.HasPrefix(digits, "0X") {
+		num, err := strconv.ParseInt(sign+digits[2:], 16, 64)
 		return "0x%X", num, err
-	} else if strings.HasPrefix(numberString, "0o") {
-		num, err := strconv.ParseInt(numberString[2:], 8, 64)
+	} else if strings.HasPrefix(digits, "0o") {
+		num, err := strconv.ParseInt(sign+digits[2:], 8, 64)
 		return "0o%o", num, err
 	}
 	num, err := strconv.ParseInt(numberString, 10, 64)

pkg/yqlib/lib_test.go

@@ -143,6 +143,16 @@ var parseInt64Scenarios = []parseInt64Scenario{
 		numberString:         "0o10",
 		expectedParsedNumber: 8,
 	},
+	{
+		numberString:         "+0x12",
+		expectedParsedNumber: 18,
+		expectedFormatString: "0x12",
+	},
+	{
+		numberString:         "+0o22",
+		expectedParsedNumber: 18,
+		expectedFormatString: "0o22",
+	},
 }
 
 func TestParseInt64(t *testing.T) {