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      1 // Copyright 2011 The Go Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style
      3 // license that can be found in the LICENSE file.
      4 
      5 package json
      6 
      7 import (
      8 	"regexp"
      9 	"testing"
     10 )
     11 
     12 func TestNumberIsValid(t *testing.T) {
     13 	// From: http://stackoverflow.com/a/13340826
     14 	var jsonNumberRegexp = regexp.MustCompile(`^-?(?:0|[1-9]\d*)(?:\.\d+)?(?:[eE][+-]?\d+)?$`)
     15 
     16 	validTests := []string{
     17 		"0",
     18 		"-0",
     19 		"1",
     20 		"-1",
     21 		"0.1",
     22 		"-0.1",
     23 		"1234",
     24 		"-1234",
     25 		"12.34",
     26 		"-12.34",
     27 		"12E0",
     28 		"12E1",
     29 		"12e34",
     30 		"12E-0",
     31 		"12e+1",
     32 		"12e-34",
     33 		"-12E0",
     34 		"-12E1",
     35 		"-12e34",
     36 		"-12E-0",
     37 		"-12e+1",
     38 		"-12e-34",
     39 		"1.2E0",
     40 		"1.2E1",
     41 		"1.2e34",
     42 		"1.2E-0",
     43 		"1.2e+1",
     44 		"1.2e-34",
     45 		"-1.2E0",
     46 		"-1.2E1",
     47 		"-1.2e34",
     48 		"-1.2E-0",
     49 		"-1.2e+1",
     50 		"-1.2e-34",
     51 		"0E0",
     52 		"0E1",
     53 		"0e34",
     54 		"0E-0",
     55 		"0e+1",
     56 		"0e-34",
     57 		"-0E0",
     58 		"-0E1",
     59 		"-0e34",
     60 		"-0E-0",
     61 		"-0e+1",
     62 		"-0e-34",
     63 	}
     64 
     65 	for _, test := range validTests {
     66 		if !isValidNumber(test) {
     67 			t.Errorf("%s should be valid", test)
     68 		}
     69 
     70 		var f float64
     71 		if err := Unmarshal([]byte(test), &f); err != nil {
     72 			t.Errorf("%s should be valid but Unmarshal failed: %v", test, err)
     73 		}
     74 
     75 		if !jsonNumberRegexp.MatchString(test) {
     76 			t.Errorf("%s should be valid but regexp does not match", test)
     77 		}
     78 	}
     79 
     80 	invalidTests := []string{
     81 		"",
     82 		"invalid",
     83 		"1.0.1",
     84 		"1..1",
     85 		"-1-2",
     86 		"012a42",
     87 		"01.2",
     88 		"012",
     89 		"12E12.12",
     90 		"1e2e3",
     91 		"1e+-2",
     92 		"1e--23",
     93 		"1e",
     94 		"e1",
     95 		"1e+",
     96 		"1ea",
     97 		"1a",
     98 		"1.a",
     99 		"1.",
    100 		"01",
    101 		"1.e1",
    102 	}
    103 
    104 	for _, test := range invalidTests {
    105 		if isValidNumber(test) {
    106 			t.Errorf("%s should be invalid", test)
    107 		}
    108 
    109 		var f float64
    110 		if err := Unmarshal([]byte(test), &f); err == nil {
    111 			t.Errorf("%s should be invalid but unmarshal wrote %v", test, f)
    112 		}
    113 
    114 		if jsonNumberRegexp.MatchString(test) {
    115 			t.Errorf("%s should be invalid but matches regexp", test)
    116 		}
    117 	}
    118 }
    119 
    120 func BenchmarkNumberIsValid(b *testing.B) {
    121 	s := "-61657.61667E+61673"
    122 	for i := 0; i < b.N; i++ {
    123 		isValidNumber(s)
    124 	}
    125 }
    126 
    127 func BenchmarkNumberIsValidRegexp(b *testing.B) {
    128 	var jsonNumberRegexp = regexp.MustCompile(`^-?(?:0|[1-9]\d*)(?:\.\d+)?(?:[eE][+-]?\d+)?$`)
    129 	s := "-61657.61667E+61673"
    130 	for i := 0; i < b.N; i++ {
    131 		jsonNumberRegexp.MatchString(s)
    132 	}
    133 }
    134