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string.go
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string.go
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package gofakeit
import "math/rand"
// Letter will generate a single random lower case ASCII letter
func Letter() string { return letter(globalFaker.Rand) }
// Letter will generate a single random lower case ASCII letter
func (f *Faker) Letter() string { return letter(f.Rand) }
func letter(r *rand.Rand) string { return string(randLetter(r)) }
// LetterN will generate a random ASCII string with length N
func LetterN(n uint) string { return letterN(globalFaker.Rand, n) }
// LetterN will generate a random ASCII string with length N
func (f *Faker) LetterN(n uint) string { return letterN(f.Rand, n) }
func letterN(r *rand.Rand, n uint) string {
// Make sure we dont use 0
if n == 0 {
n = 1
}
out := make([]rune, n)
for i := 0; i < int(n); i++ {
out[i] = randLetter(r)
}
return string(out)
}
// Vowel will generate a single random lower case vowel
func Vowel() string { return vowel(globalFaker.Rand) }
// Vowel will generate a single random lower case vowel
func (f *Faker) Vowel() string { return vowel(f.Rand) }
func vowel(r *rand.Rand) string { return string(randCharacter(r, vowels)) }
// Digit will generate a single ASCII digit
func Digit() string { return digit(globalFaker.Rand) }
// Digit will generate a single ASCII digit
func (f *Faker) Digit() string { return digit(f.Rand) }
func digit(r *rand.Rand) string { return string(randDigit(r)) }
// DigitN will generate a random string of length N consists of ASCII digits (note it can start with 0).
func DigitN(n uint) string { return digitN(globalFaker.Rand, n) }
// DigitN will generate a random string of length N consists of ASCII digits (note it can start with 0).
func (f *Faker) DigitN(n uint) string { return digitN(f.Rand, n) }
func digitN(r *rand.Rand, n uint) string {
// Make sure we dont use 0
if n == 0 {
n = 1
}
out := make([]rune, n)
for i := 0; i < int(n); i++ {
out[i] = randDigit(r)
}
return string(out)
}
// Numerify will replace # with random numerical values
func Numerify(str string) string { return numerify(globalFaker.Rand, str) }
// Numerify will replace # with random numerical values
func (f *Faker) Numerify(str string) string { return numerify(f.Rand, str) }
func numerify(r *rand.Rand, str string) string { return replaceWithNumbers(r, str) }
// Lexify will replace ? with random generated letters
func Lexify(str string) string { return lexify(globalFaker.Rand, str) }
// Lexify will replace ? with random generated letters
func (f *Faker) Lexify(str string) string { return lexify(f.Rand, str) }
func lexify(r *rand.Rand, str string) string { return replaceWithLetters(r, str) }
// ShuffleStrings will randomize a slice of strings
func ShuffleStrings(a []string) { shuffleStrings(globalFaker.Rand, a) }
// ShuffleStrings will randomize a slice of strings
func (f *Faker) ShuffleStrings(a []string) { shuffleStrings(f.Rand, a) }
func shuffleStrings(r *rand.Rand, a []string) {
swap := func(i, j int) {
a[i], a[j] = a[j], a[i]
}
//to avoid upgrading to 1.10 I copied the algorithm
n := len(a)
if n <= 1 {
return
}
//if size is > int32 probably it will never finish, or ran out of entropy
i := n - 1
for ; i > 0; i-- {
j := int(r.Int31n(int32(i + 1)))
swap(i, j)
}
}
// RandomString will take in a slice of string and return a randomly selected value
func RandomString(a []string) string { return randomString(globalFaker.Rand, a) }
// RandomString will take in a slice of string and return a randomly selected value
func (f *Faker) RandomString(a []string) string { return randomString(f.Rand, a) }
func randomString(r *rand.Rand, a []string) string {
size := len(a)
if size == 0 {
return ""
}
if size == 1 {
return a[0]
}
return a[r.Intn(size)]
}
func addStringLookup() {
AddFuncLookup("letter", Info{
Display: "Letter",
Category: "string",
Description: "Generate a single random lower case ASCII letter",
Example: "g",
Output: "string",
Generate: func(r *rand.Rand, m *MapParams, info *Info) (interface{}, error) {
return letter(r), nil
},
})
AddFuncLookup("lettern", Info{
Display: "LetterN",
Category: "string",
Description: "Generate a random ASCII string with length N",
Example: "gbRMaRxHki",
Output: "string",
Params: []Param{
{Field: "count", Display: "Count", Type: "uint", Description: "Number of digits to generate"},
},
Generate: func(r *rand.Rand, m *MapParams, info *Info) (interface{}, error) {
ui, err := info.GetUint(m, "count")
if err != nil {
return nil, err
}
return letterN(r, ui), nil
},
})
AddFuncLookup("vowel", Info{
Display: "Vowel",
Category: "string",
Description: "Generate a single random lower case vowel",
Example: "a",
Output: "string",
Generate: func(r *rand.Rand, m *MapParams, info *Info) (interface{}, error) {
return vowel(r), nil
},
})
AddFuncLookup("digit", Info{
Display: "Digit",
Category: "string",
Description: "Generate a single ASCII digit",
Example: "0",
Output: "string",
Generate: func(r *rand.Rand, m *MapParams, info *Info) (interface{}, error) {
return digit(r), nil
},
})
AddFuncLookup("digitn", Info{
Display: "DigitN",
Category: "string",
Description: "Generate a random string of length N consists of ASCII digits",
Example: "0136459948",
Output: "string",
Params: []Param{
{Field: "count", Display: "Count", Type: "uint", Description: "Number of digits to generate"},
},
Generate: func(r *rand.Rand, m *MapParams, info *Info) (interface{}, error) {
ui, err := info.GetUint(m, "count")
if err != nil {
return nil, err
}
return digitN(r, ui), nil
},
})
AddFuncLookup("numerify", Info{
Display: "Numerify",
Category: "string",
Description: "Replace # with random numerical values",
Example: "(###)###-#### => (555)867-5309",
Output: "string",
Params: []Param{
{Field: "str", Display: "String", Type: "string", Description: "String value to replace #'s"},
},
Generate: func(r *rand.Rand, m *MapParams, info *Info) (interface{}, error) {
str, err := info.GetString(m, "str")
if err != nil {
return nil, err
}
return numerify(r, str), nil
},
})
AddFuncLookup("lexify", Info{
Display: "Lexify",
Category: "string",
Description: "Replace ? with random generated letters",
Example: "?????@??????.com => [email protected]",
Output: "string",
Params: []Param{
{Field: "str", Display: "String", Type: "string", Description: "String value to replace ?'s"},
},
Generate: func(r *rand.Rand, m *MapParams, info *Info) (interface{}, error) {
str, err := info.GetString(m, "str")
if err != nil {
return nil, err
}
return lexify(r, str), nil
},
})
AddFuncLookup("shufflestrings", Info{
Display: "Shuffle Strings",
Category: "string",
Description: "Shuffle an array of strings",
Example: "hello,world,whats,up => whats,world,hello,up",
Output: "[]string",
ContentType: "application/json",
Params: []Param{
{Field: "strs", Display: "Strings", Type: "[]string", Description: "Delimited separated strings"},
},
Generate: func(r *rand.Rand, m *MapParams, info *Info) (interface{}, error) {
strs, err := info.GetStringArray(m, "strs")
if err != nil {
return nil, err
}
shuffleStrings(r, strs)
return strs, nil
},
})
AddFuncLookup("randomstring", Info{
Display: "Random String",
Category: "string",
Description: "Randomly grab one string from array",
Example: "hello,world,whats,up => world",
Output: "[]string",
Params: []Param{
{Field: "strs", Display: "Strings", Type: "[]string", Description: "Delimited separated strings"},
},
Generate: func(r *rand.Rand, m *MapParams, info *Info) (interface{}, error) {
strs, err := info.GetStringArray(m, "strs")
if err != nil {
return nil, err
}
return randomString(r, strs), nil
},
})
}