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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