441 lines
10 KiB
Go
441 lines
10 KiB
Go
package gofakeit
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import (
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"errors"
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"math/rand"
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"reflect"
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"strconv"
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"strings"
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"time"
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)
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// Struct fills in exported fields of a struct with random data
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// based on the value of `fake` tag of exported fields.
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// Use `fake:"skip"` to explicitly skip an element.
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// All built-in types are supported, with templating support
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// for string types.
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func Struct(v interface{}) error { return structFunc(globalFaker.Rand, v) }
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// Struct fills in exported fields of a struct with random data
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// based on the value of `fake` tag of exported fields.
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// Use `fake:"skip"` to explicitly skip an element.
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// All built-in types are supported, with templating support
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// for string types.
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func (f *Faker) Struct(v interface{}) error { return structFunc(f.Rand, v) }
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func structFunc(ra *rand.Rand, v interface{}) error {
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return r(ra, reflect.TypeOf(v), reflect.ValueOf(v), "", 0)
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}
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func r(ra *rand.Rand, t reflect.Type, v reflect.Value, tag string, size int) error {
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switch t.Kind() {
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case reflect.Ptr:
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return rPointer(ra, t, v, tag, size)
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case reflect.Struct:
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return rStruct(ra, t, v, tag)
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case reflect.String:
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return rString(ra, v, tag)
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case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
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return rUint(ra, t, v, tag)
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case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
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return rInt(ra, t, v, tag)
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case reflect.Float32, reflect.Float64:
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return rFloat(ra, t, v, tag)
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case reflect.Bool:
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return rBool(ra, v, tag)
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case reflect.Array, reflect.Slice:
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return rSlice(ra, t, v, tag, size)
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case reflect.Map:
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return rMap(ra, t, v, tag, size)
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}
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return nil
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}
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func rCustom(ra *rand.Rand, t reflect.Type, v reflect.Value, tag string) error {
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// If tag is empty return error
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if tag == "" {
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return errors.New("tag is empty")
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}
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fName, fParams := parseNameAndParamsFromTag(tag)
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// Check to see if its a replaceable lookup function
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if info := GetFuncLookup(fName); info != nil {
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// Parse map params
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mapParams := parseMapParams(info, fParams)
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// Call function
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fValue, err := info.Generate(ra, mapParams, info)
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if err != nil {
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return err
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}
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// Create new element of expected type
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field := reflect.New(reflect.TypeOf(fValue))
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field.Elem().Set(reflect.ValueOf(fValue))
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// Check if element is pointer if so
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// grab the underlyning value
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fieldElem := field.Elem()
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if fieldElem.Kind() == reflect.Ptr {
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fieldElem = fieldElem.Elem()
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}
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// Check if field kind is the same as the expected type
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if fieldElem.Kind() != v.Kind() {
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// return error saying the field and kinds that do not match
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return errors.New("field kind " + fieldElem.Kind().String() + " does not match expected kind " + v.Kind().String())
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}
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// Set the value
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v.Set(fieldElem)
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// If a function is called to set the struct
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// stop from going through sub fields
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return nil
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}
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return errors.New("function not found")
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}
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func rStruct(ra *rand.Rand, t reflect.Type, v reflect.Value, tag string) error {
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// Check if tag exists, if so run custom function
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if t.Name() != "" && tag != "" {
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return rCustom(ra, t, v, tag)
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}
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n := t.NumField()
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for i := 0; i < n; i++ {
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elementT := t.Field(i)
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elementV := v.Field(i)
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fakeTag, ok := elementT.Tag.Lookup("fake")
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// Check whether or not to skip this field
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if ok && fakeTag == "skip" {
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// Do nothing, skip it
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continue
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}
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// Check to make sure you can set it or that its an embeded(anonymous) field
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if elementV.CanSet() || elementT.Anonymous {
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// Check if reflect type is of values we can specifically set
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switch elementT.Type.String() {
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case "time.Time":
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err := rTime(ra, elementT, elementV, fakeTag)
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if err != nil {
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return err
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}
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continue
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}
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// Check if fakesize is set
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size := -1 // Set to -1 to indicate fakesize was not set
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fs, ok := elementT.Tag.Lookup("fakesize")
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if ok {
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var err error
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// Check if size has params separated by ,
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if strings.Contains(fs, ",") {
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sizeSplit := strings.SplitN(fs, ",", 2)
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if len(sizeSplit) == 2 {
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var sizeMin int
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var sizeMax int
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sizeMin, err = strconv.Atoi(sizeSplit[0])
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if err != nil {
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return err
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}
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sizeMax, err = strconv.Atoi(sizeSplit[1])
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if err != nil {
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return err
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}
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size = ra.Intn(sizeMax-sizeMin+1) + sizeMin
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}
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} else {
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size, err = strconv.Atoi(fs)
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if err != nil {
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return err
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}
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}
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}
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err := r(ra, elementT.Type, elementV, fakeTag, size)
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if err != nil {
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return err
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}
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}
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}
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return nil
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}
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func rPointer(ra *rand.Rand, t reflect.Type, v reflect.Value, tag string, size int) error {
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elemT := t.Elem()
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if v.IsNil() {
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nv := reflect.New(elemT)
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err := r(ra, elemT, nv.Elem(), tag, size)
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if err != nil {
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return err
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}
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v.Set(nv)
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} else {
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err := r(ra, elemT, v.Elem(), tag, size)
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if err != nil {
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return err
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}
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}
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return nil
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}
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func rSlice(ra *rand.Rand, t reflect.Type, v reflect.Value, tag string, size int) error {
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// If you cant even set it dont even try
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if !v.CanSet() {
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return errors.New("cannot set slice")
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}
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// Check if tag exists, if so run custom function
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if t.Name() != "" && tag != "" {
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// Check to see if custom function works if not continue to normal loop of values
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err := rCustom(ra, t, v, tag)
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if err == nil {
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return nil
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}
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}
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// Grab original size to use if needed for sub arrays
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ogSize := size
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// If the value has a len and is less than the size
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// use that instead of the requested size
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elemLen := v.Len()
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if elemLen == 0 && size == -1 {
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size = number(ra, 1, 10)
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} else if elemLen != 0 && (size == -1 || elemLen < size) {
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size = elemLen
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}
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// Get the element type
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elemT := t.Elem()
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// Loop through the elements length and set based upon the index
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for i := 0; i < size; i++ {
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nv := reflect.New(elemT)
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err := r(ra, elemT, nv.Elem(), tag, ogSize)
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if err != nil {
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return err
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}
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// If values are already set fill them up, otherwise append
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if elemLen != 0 {
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v.Index(i).Set(reflect.Indirect(nv))
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} else {
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v.Set(reflect.Append(reflect.Indirect(v), reflect.Indirect(nv)))
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}
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}
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return nil
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}
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func rMap(ra *rand.Rand, t reflect.Type, v reflect.Value, tag string, size int) error {
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// If you cant even set it dont even try
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if !v.CanSet() {
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return errors.New("cannot set slice")
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}
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// Check if tag exists, if so run custom function
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if t.Name() != "" && tag != "" {
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return rCustom(ra, t, v, tag)
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}
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// Set a size
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newSize := size
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if newSize == -1 {
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newSize = number(ra, 1, 10)
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}
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// Create new map based upon map key value type
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mapType := reflect.MapOf(t.Key(), t.Elem())
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newMap := reflect.MakeMap(mapType)
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for i := 0; i < newSize; i++ {
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// Create new key
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mapIndex := reflect.New(t.Key())
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err := r(ra, t.Key(), mapIndex.Elem(), "", -1)
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if err != nil {
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return err
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}
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// Create new value
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mapValue := reflect.New(t.Elem())
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err = r(ra, t.Elem(), mapValue.Elem(), "", -1)
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if err != nil {
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return err
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}
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newMap.SetMapIndex(mapIndex.Elem(), mapValue.Elem())
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}
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// Set newMap into struct field
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if t.Kind() == reflect.Ptr {
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v.Set(newMap.Elem())
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} else {
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v.Set(newMap)
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}
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return nil
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}
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func rString(ra *rand.Rand, v reflect.Value, tag string) error {
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if tag != "" {
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v.SetString(generate(ra, tag))
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} else {
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v.SetString(generate(ra, strings.Repeat("?", number(ra, 4, 10))))
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}
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return nil
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}
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func rInt(ra *rand.Rand, t reflect.Type, v reflect.Value, tag string) error {
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if tag != "" {
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i, err := strconv.ParseInt(generate(ra, tag), 10, 64)
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if err != nil {
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return err
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}
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v.SetInt(i)
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return nil
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}
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// If no tag or error converting to int, set with random value
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switch t.Kind() {
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case reflect.Int:
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v.SetInt(int64Func(ra))
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case reflect.Int8:
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v.SetInt(int64(int8Func(ra)))
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case reflect.Int16:
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v.SetInt(int64(int16Func(ra)))
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case reflect.Int32:
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v.SetInt(int64(int32Func(ra)))
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case reflect.Int64:
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v.SetInt(int64Func(ra))
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}
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return nil
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}
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func rUint(ra *rand.Rand, t reflect.Type, v reflect.Value, tag string) error {
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if tag != "" {
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u, err := strconv.ParseUint(generate(ra, tag), 10, 64)
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if err != nil {
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return err
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}
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v.SetUint(u)
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return nil
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}
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// If no tag or error converting to uint, set with random value
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switch t.Kind() {
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case reflect.Uint:
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v.SetUint(uint64Func(ra))
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case reflect.Uint8:
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v.SetUint(uint64(uint8Func(ra)))
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case reflect.Uint16:
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v.SetUint(uint64(uint16Func(ra)))
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case reflect.Uint32:
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v.SetUint(uint64(uint32Func(ra)))
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case reflect.Uint64:
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v.SetUint(uint64Func(ra))
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}
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return nil
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}
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func rFloat(ra *rand.Rand, t reflect.Type, v reflect.Value, tag string) error {
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if tag != "" {
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f, err := strconv.ParseFloat(generate(ra, tag), 64)
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if err != nil {
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return err
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}
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v.SetFloat(f)
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return nil
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}
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// If no tag or error converting to float, set with random value
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switch t.Kind() {
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case reflect.Float64:
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v.SetFloat(float64Func(ra))
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case reflect.Float32:
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v.SetFloat(float64(float32Func(ra)))
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}
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return nil
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}
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func rBool(ra *rand.Rand, v reflect.Value, tag string) error {
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if tag != "" {
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b, err := strconv.ParseBool(generate(ra, tag))
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if err != nil {
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return err
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}
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v.SetBool(b)
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return nil
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}
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// If no tag or error converting to boolean, set with random value
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v.SetBool(boolFunc(ra))
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return nil
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}
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// rTime will set a time.Time field the best it can from either the default date tag or from the generate tag
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func rTime(ra *rand.Rand, t reflect.StructField, v reflect.Value, tag string) error {
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if tag != "" {
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// Generate time
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timeOutput := generate(ra, tag)
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// Check to see if timeOutput has monotonic clock reading
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// if so, remove it. This is because time.Parse() does not
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// support parsing the monotonic clock reading
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if strings.Contains(timeOutput, " m=") {
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timeOutput = strings.Split(timeOutput, " m=")[0]
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}
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// Check to see if they are passing in a format to parse the time
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timeFormat, timeFormatOK := t.Tag.Lookup("format")
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if timeFormatOK {
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timeFormat = javaDateFormatToGolangDateFormat(timeFormat)
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} else {
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// If tag == "{date}" use time.RFC3339
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// They are attempting to use the default date lookup
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if tag == "{date}" {
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timeFormat = time.RFC3339
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} else {
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// Default format of time.Now().String()
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timeFormat = "2006-01-02 15:04:05.999999999 -0700 MST"
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}
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}
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// If output is larger than format cut the output
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// This helps us avoid errors from time.Parse
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if len(timeOutput) > len(timeFormat) {
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timeOutput = timeOutput[:len(timeFormat)]
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}
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// Attempt to parse the time
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timeStruct, err := time.Parse(timeFormat, timeOutput)
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if err != nil {
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return err
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}
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v.Set(reflect.ValueOf(timeStruct))
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return nil
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}
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v.Set(reflect.ValueOf(date(ra)))
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return nil
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}
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