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placeholder.go
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placeholder.go
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package jm
import (
"errors"
"fmt"
"reflect"
"regexp"
"time"
)
// Placeholder is a function used to validate partially unknown values
// in the actual JSON by assigning .
type Placeholder func() (string, func(actualValue interface{}) error)
// WithNotEmpty looks for a placeholder value in the expected JSON
// and confirms the actual value is not empty.
func WithNotEmpty(placeholder string) Placeholder {
return func() (string, func(interface{}) error) {
return placeholder, func(val interface{}) error {
if isEmpty(val) {
return errors.New("expected value to be not empty, but it was")
}
return nil
}
}
}
// WithRegexp looks for the placeholder value in the expected JSON and confirms the
// actual value matches the given regular expression.
func WithRegexp(placeholder string, re *regexp.Regexp) Placeholder {
return func() (string, func(interface{}) error) {
return placeholder, func(val interface{}) error {
str, ok := val.(string)
if !ok {
return fmt.Errorf("cannot match, value is of type %T - not a string", val)
}
if re.MatchString(str) {
return nil
}
return fmt.Errorf("value %s does not match with regexp %s", str, re)
}
}
}
// WithTimeLayout looks for the placeholder value in the expected JSON
// and confirms the actual value matches the given time layout format
func WithTimeLayout(placeholder, layout string) Placeholder {
return func() (string, func(interface{}) error) {
return placeholder, func(val interface{}) error {
str, ok := val.(string)
if !ok {
return fmt.Errorf("cannot parse time, value is of type %T - not a string", val)
}
if _, err := time.Parse(layout, str); err != nil {
return fmt.Errorf("cannot parse layout %q with %q", layout, str)
}
return nil
}
}
}
func isEmpty(i interface{}) bool {
if i == nil {
return true
}
val := reflect.ValueOf(i)
switch val.Kind() {
case reflect.Array, reflect.Chan, reflect.Map, reflect.Slice:
return val.Len() == 0
case reflect.Ptr:
if val.IsNil() {
return true
}
return isEmpty(val.Elem().Interface())
default:
return reflect.DeepEqual(i, reflect.Zero(val.Type()).Interface())
}
}