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Source file src/encoding/json/number_test.go

Documentation: encoding/json

     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: https://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  

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