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// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package json_test
import (
"regexp"
"testing"
"github.com/goccy/go-json"
)
func TestNumberIsValid(t *testing.T) {
// From: https://stackoverflow.com/a/13340826
var jsonNumberRegexp = regexp.MustCompile(`^-?(?:0|[1-9]\d*)(?:\.\d+)?(?:[eE][+-]?\d+)?$`)
validTests := []string{
"0",
"-0",
"1",
"-1",
"0.1",
"-0.1",
"1234",
"-1234",
"12.34",
"-12.34",
"12E0",
"12E1",
"12e34",
"12E-0",
"12e+1",
"12e-34",
"-12E0",
"-12E1",
"-12e34",
"-12E-0",
"-12e+1",
"-12e-34",
"1.2E0",
"1.2E1",
"1.2e34",
"1.2E-0",
"1.2e+1",
"1.2e-34",
"-1.2E0",
"-1.2E1",
"-1.2e34",
"-1.2E-0",
"-1.2e+1",
"-1.2e-34",
"0E0",
"0E1",
"0e34",
"0E-0",
"0e+1",
"0e-34",
"-0E0",
"-0E1",
"-0e34",
"-0E-0",
"-0e+1",
"-0e-34",
}
for i, test := range validTests {
if !isValidNumber(test) {
t.Errorf("%d: %s should be valid", i, test)
}
var f float64
if err := json.Unmarshal([]byte(test), &f); err != nil {
t.Errorf("%d: %s should be valid but Unmarshal failed: %v", i, test, err)
}
if !jsonNumberRegexp.MatchString(test) {
t.Errorf("%d: %s should be valid but regexp does not match", i, test)
}
}
invalidTests := []string{
"",
"invalid",
"1.0.1",
"1..1",
"-1-2",
"012a42",
//"01.2",
//"012",
"12E12.12",
"1e2e3",
"1e+-2",
"1e--23",
"1e",
"e1",
"1e+",
"1ea",
"1a",
"1.a",
//"1.",
//"01",
//"1.e1",
}
for i, test := range invalidTests {
if isValidNumber(test) {
t.Errorf("%d: %s should be invalid", i, test)
}
var f float64
if err := json.Unmarshal([]byte(test), &f); err == nil {
t.Errorf("%d: %s should be invalid but unmarshal wrote %v", i, test, f)
}
if jsonNumberRegexp.MatchString(test) {
t.Errorf("%d: %s should be invalid but matches regexp", i, test)
}
}
}
// isValidNumber reports whether s is a valid JSON number literal.
func isValidNumber(s string) bool {
// This function implements the JSON numbers grammar.
// See https://tools.ietf.org/html/rfc7159#section-6
// and https://www.json.org/img/number.png
if s == "" {
return false
}
// Optional -
if s[0] == '-' {
s = s[1:]
if s == "" {
return false
}
}
// Digits
switch {
default:
return false
case s[0] == '0':
s = s[1:]
case '1' <= s[0] && s[0] <= '9':
s = s[1:]
for len(s) > 0 && '0' <= s[0] && s[0] <= '9' {
s = s[1:]
}
}
// . followed by 1 or more digits.
if len(s) >= 2 && s[0] == '.' && '0' <= s[1] && s[1] <= '9' {
s = s[2:]
for len(s) > 0 && '0' <= s[0] && s[0] <= '9' {
s = s[1:]
}
}
// e or E followed by an optional - or + and
// 1 or more digits.
if len(s) >= 2 && (s[0] == 'e' || s[0] == 'E') {
s = s[1:]
if s[0] == '+' || s[0] == '-' {
s = s[1:]
if s == "" {
return false
}
}
for len(s) > 0 && '0' <= s[0] && s[0] <= '9' {
s = s[1:]
}
}
// Make sure we are at the end.
return s == ""
}
func BenchmarkNumberIsValid(b *testing.B) {
s := "-61657.61667E+61673"
for i := 0; i < b.N; i++ {
isValidNumber(s)
}
}
func BenchmarkNumberIsValidRegexp(b *testing.B) {
var jsonNumberRegexp = regexp.MustCompile(`^-?(?:0|[1-9]\d*)(?:\.\d+)?(?:[eE][+-]?\d+)?$`)
s := "-61657.61667E+61673"
for i := 0; i < b.N; i++ {
jsonNumberRegexp.MatchString(s)
}
}
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