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value.go
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value.go
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// Copyright (c) 2020 SDSLabs
// Use of this source code is governed by an MIT license
// details of which can be found in the LICENSE file.
package set
import (
"encoding/json"
"fmt"
"github.com/sdslabs/kiwi"
)
func init() {
kiwi.RegisterValue(func() kiwi.Value { return &Value{} })
}
// Type of set value.
const Type kiwi.ValueType = "set"
// Value can store a set of strings.
//
// It implements the kiwi.Value interface.
type Value map[string]struct{}
// Various errors for set value type.
var (
ErrInvalidParamLen = fmt.Errorf("not enough parameters")
ErrInvalidParamType = fmt.Errorf("invalid paramater type")
)
// newParamLenErr creates an error where parameter length is wrong.
func newParamLenErr(u, l int) error {
return fmt.Errorf("%w: got %d; requires %d", ErrInvalidParamLen, u, l)
}
// newParamTypeErr creates an error where parameter type is wrong.
func newParamTypeErr(p, e interface{}) error {
typ := fmt.Sprintf("%T", e)
return fmt.Errorf("%w: %#v not a(n) %q", ErrInvalidParamType, p, typ)
}
const (
// Insert inserts the element(s) in the set.
//
// Returns an array of added elements.
Insert kiwi.Action = "INSERT"
// Remove removes the element(s) from the set.
//
// Returns an array of removed elements.
Remove kiwi.Action = "REMOVE"
// Has checks if set has the element.
//
// Returns boolean value.
Has kiwi.Action = "HAS"
// Len gets the length of the set.
//
// Returns an integer.
Len kiwi.Action = "LEN"
// Get gets all the elements of set.
//
// Returns an array of elements.
Get kiwi.Action = "GET"
)
// Type returns v's type, i.e., "set".
func (v *Value) Type() kiwi.ValueType {
return Type
}
// DoMap returns the map of v's actions with it's do functions.
func (v *Value) DoMap() map[kiwi.Action]kiwi.DoFunc {
return map[kiwi.Action]kiwi.DoFunc{
Insert: v.insert,
Remove: v.remove,
Has: v.has,
Len: v.len,
Get: v.get,
}
}
// ToJSON returns the raw byte array of value
func (v *Value) ToJSON() (json.RawMessage, error) {
vals := make([]string, len(*v))
i := 0
for k := range *v {
vals[i] = k
i++
}
c, err := json.Marshal(vals)
if err != nil {
return nil, err
}
return json.RawMessage(c), nil
}
// FromJSON populates the value with the data from RawMessage
func (v *Value) FromJSON(rawmessage json.RawMessage) error {
vals := []string{}
if err := json.Unmarshal(rawmessage, &vals); err != nil {
return err
}
for _, c := range vals {
(*v)[c] = struct{}{}
}
return nil
}
// insert implements the INSERT action.
func (v *Value) insert(params ...interface{}) (interface{}, error) {
if len(params) == 0 {
return nil, newParamLenErr(0, 1)
}
var (
toInsert string
ok bool
)
out := make([]string, len(params))
for i := 0; i < len(params); i++ {
toInsert, ok = params[i].(string)
if !ok {
return nil, newParamTypeErr(params[i], toInsert)
}
(*v)[toInsert] = struct{}{}
out[i] = toInsert
}
return out, nil
}
// remove implements the REMOVE action.
func (v *Value) remove(params ...interface{}) (interface{}, error) {
if len(params) == 0 {
return nil, newParamLenErr(0, 1)
}
var (
toRemove string
ok bool
)
out := make([]string, len(params))
for i := 0; i < len(params); i++ {
toRemove, ok = params[i].(string)
if !ok {
return nil, newParamTypeErr(params[i], toRemove)
}
delete((*v), toRemove)
out[i] = toRemove
}
return out, nil
}
// has implements the HAS action.
func (v *Value) has(params ...interface{}) (interface{}, error) {
if len(params) != 1 {
return nil, newParamLenErr(len(params), 1)
}
toCheck, ok := params[0].(string)
if !ok {
return nil, newParamTypeErr(params[0], toCheck)
}
_, ok = (*v)[toCheck]
return ok, nil
}
// len implements the LEN action.
func (v *Value) len(params ...interface{}) (interface{}, error) {
if len(params) != 0 {
return nil, newParamLenErr(len(params), 0)
}
return len(*v), nil
}
// get implements the GET action.
func (v *Value) get(params ...interface{}) (interface{}, error) {
if len(params) != 0 {
return nil, newParamLenErr(len(params), 0)
}
i := 0
out := make([]string, len(*v))
for elem := range *v {
out[i] = elem
i++
}
return out, nil
}
// Interface guard.
var _ kiwi.Value = (*Value)(nil)