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values.go
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values.go
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// Package values declares the flux data types and implements them.
package values
import (
"bytes"
"fmt"
"regexp"
"runtime/debug"
"strconv"
"github.com/influxdata/flux/codes"
"github.com/influxdata/flux/internal/errors"
"github.com/influxdata/flux/semantic"
)
type Typer interface {
Type() semantic.MonoType
}
type Value interface {
Typer
IsNull() bool
Str() string
Bytes() []byte
Int() int64
UInt() uint64
Float() float64
Bool() bool
Time() Time
Duration() Duration
Regexp() *regexp.Regexp
Array() Array
Object() Object
Function() Function
Dict() Dictionary
Equal(Value) bool
}
type value struct {
t semantic.MonoType
v interface{}
}
func (v value) Type() semantic.MonoType {
return v.t
}
func (v value) IsNull() bool {
return v.v == nil
}
func (v value) Str() string {
CheckKind(v.t.Nature(), semantic.String)
return v.v.(string)
}
func (v value) Bytes() []byte {
CheckKind(v.t.Nature(), semantic.Bytes)
return v.v.([]byte)
}
func (v value) Int() int64 {
CheckKind(v.t.Nature(), semantic.Int)
return v.v.(int64)
}
func (v value) UInt() uint64 {
CheckKind(v.t.Nature(), semantic.UInt)
return v.v.(uint64)
}
func (v value) Float() float64 {
CheckKind(v.t.Nature(), semantic.Float)
return v.v.(float64)
}
func (v value) Bool() bool {
CheckKind(v.t.Nature(), semantic.Bool)
return v.v.(bool)
}
func (v value) Time() Time {
CheckKind(v.t.Nature(), semantic.Time)
return v.v.(Time)
}
func (v value) Duration() Duration {
CheckKind(v.t.Nature(), semantic.Duration)
return v.v.(Duration)
}
func (v value) Regexp() *regexp.Regexp {
CheckKind(v.t.Nature(), semantic.Regexp)
return v.v.(*regexp.Regexp)
}
func (v value) Array() Array {
CheckKind(v.t.Nature(), semantic.Array)
return v.v.(Array)
}
func (v value) Object() Object {
CheckKind(v.t.Nature(), semantic.Object)
return v.v.(Object)
}
func (v value) Function() Function {
CheckKind(v.t.Nature(), semantic.Function)
return v.v.(Function)
}
func (v value) Dict() Dictionary {
CheckKind(v.t.Nature(), semantic.Dictionary)
return v.v.(Dictionary)
}
func (v value) Equal(r Value) bool {
if v.Type().Nature() != r.Type().Nature() {
return false
}
if v.IsNull() || r.IsNull() {
return false
}
switch k := v.Type().Nature(); k {
case semantic.Bool:
return v.Bool() == r.Bool()
case semantic.UInt:
return v.UInt() == r.UInt()
case semantic.Int:
return v.Int() == r.Int()
case semantic.Float:
return v.Float() == r.Float()
case semantic.String:
return v.Str() == r.Str()
case semantic.Bytes:
return bytes.Equal(v.Bytes(), r.Bytes())
case semantic.Time:
return v.Time() == r.Time()
case semantic.Duration:
return v.Duration() == r.Duration()
case semantic.Regexp:
return v.Regexp().String() == r.Regexp().String()
case semantic.Object:
return v.Object().Equal(r.Object())
case semantic.Array:
return v.Array().Equal(r.Array())
case semantic.Function:
return v.Function().Equal(r.Function())
case semantic.Dictionary:
return v.Dict().Equal(r.Dict())
default:
return false
}
}
func (v value) String() string {
return fmt.Sprintf("%v", v.v)
}
var (
// InvalidValue is a non nil value who's type is semantic.Invalid
InvalidValue = value{}
// Null is an untyped nil value.
Null = null{}
// Void is an empty record used to represent a void value.
Void = NewObject(semantic.NewObjectType(nil))
)
// Unwrap will extract the primitive value from the Value interface.
func Unwrap(v Value) interface{} {
if v.IsNull() {
return nil
}
switch n := v.Type().Nature(); n {
case semantic.String:
return v.Str()
case semantic.Bytes:
return v.Bytes()
case semantic.Int:
return v.Int()
case semantic.UInt:
return v.UInt()
case semantic.Float:
return v.Float()
case semantic.Bool:
return v.Bool()
case semantic.Time:
return v.Time()
case semantic.Duration:
return v.Duration()
case semantic.Regexp:
return v.Regexp()
case semantic.Array:
arr := v.Array()
a := make([]interface{}, arr.Len())
arr.Range(func(i int, v Value) {
val := Unwrap(v)
a[i] = val
})
return a
case semantic.Object:
obj := v.Object()
o := make(map[string]interface{}, obj.Len())
obj.Range(func(k string, v Value) {
val := Unwrap(v)
o[k] = val
})
return o
case semantic.Dictionary:
dict := v.Dict()
d := make(map[interface{}]interface{}, dict.Len())
dict.Range(func(key, value Value) {
k := Unwrap(key)
d[k] = Unwrap(value)
})
return d
case semantic.Function:
// there is no primitive value for a Function object, just return itself.
return v
default:
panic(errors.Newf(codes.Unknown, "cannot unwrap a %v type value", n))
}
}
// New constructs a new Value by inferring the type from the interface.
// Note this method will panic if passed a nil value. If the interface
// does not translate to a valid Value type, then InvalidValue is returned.
func New(v interface{}) Value {
if v == nil {
return Null
}
switch v := v.(type) {
case string:
return NewString(v)
case []byte:
return NewBytes(v)
case int64:
return NewInt(v)
case uint64:
return NewUInt(v)
case float64:
return NewFloat(v)
case bool:
return NewBool(v)
case Time:
return NewTime(v)
case Duration:
return NewDuration(v)
case *regexp.Regexp:
return NewRegexp(v)
default:
return InvalidValue
}
}
func NewNull(t semantic.MonoType) Value {
return value{
t: t,
v: nil,
}
}
func NewString(v string) Value {
return value{
t: semantic.BasicString,
v: v,
}
}
func NewBytes(v []byte) Value {
return value{
t: semantic.BasicBytes,
v: v,
}
}
func NewInt(v int64) Value {
return value{
t: semantic.BasicInt,
v: v,
}
}
func NewUInt(v uint64) Value {
return value{
t: semantic.BasicUint,
v: v,
}
}
func NewFloat(v float64) Value {
return value{
t: semantic.BasicFloat,
v: v,
}
}
func NewTime(v Time) Value {
return value{
t: semantic.BasicTime,
v: v,
}
}
func NewDuration(v Duration) Value {
return value{
t: semantic.BasicDuration,
v: v,
}
}
func NewRegexp(v *regexp.Regexp) Value {
return value{
t: semantic.BasicRegexp,
v: v,
}
}
func Stringify(v Value) (Value, error) {
val := Unwrap(v)
switch v.Type().Nature() {
case semantic.Bool:
return NewString(strconv.FormatBool(val.(bool))), nil
case semantic.Int:
return NewString(strconv.FormatInt(val.(int64), 10)), nil
case semantic.UInt:
return NewString(strconv.FormatUint(val.(uint64), 10)), nil
case semantic.Float:
return NewString(strconv.FormatFloat(val.(float64), 'f', -1, 64)), nil
case semantic.Time:
return NewString(val.(Time).String()), nil
case semantic.Duration:
return NewString(val.(Duration).String()), nil
case semantic.String:
return v, nil
}
return nil, errors.Newf(codes.Invalid, "invalid interpolation type")
}
func UnexpectedKind(got, exp semantic.Nature) error {
return unexpectedKind{got: got, want: exp}
}
// CheckKind panics if got != exp.
func CheckKind(got, exp semantic.Nature) {
if got != exp {
panic(UnexpectedKind(got, exp))
}
}
type unexpectedKind struct {
got, want semantic.Nature
}
func (e unexpectedKind) Error() string {
// Reuse the Error method from flux.Error by converting
// this to a flux.Error type and then calling Error.
var err *errors.Error
e.As(&err)
return err.Error()
}
func (e unexpectedKind) As(target interface{}) bool {
if err, ok := target.(**errors.Error); ok {
*err = errors.Newf(codes.Internal, "unexpected kind: got %q expected %q, trace: %s", e.got, e.want, string(debug.Stack()))
return true
}
return false
}
// IsTimeable checks if value v is Timeable.
func IsTimeable(v Value) bool {
return v.Type().Nature() == semantic.Time || v.Type().Nature() == semantic.Duration
}
type null struct{}
func (n null) Type() semantic.MonoType { return semantic.MonoType{} }
func (n null) IsNull() bool { return true }
func (n null) Str() string { panic(UnexpectedKind(semantic.Invalid, semantic.String)) }
func (n null) Bytes() []byte { panic(UnexpectedKind(semantic.Invalid, semantic.Bytes)) }
func (n null) Int() int64 { panic(UnexpectedKind(semantic.Invalid, semantic.Int)) }
func (n null) UInt() uint64 { panic(UnexpectedKind(semantic.Invalid, semantic.UInt)) }
func (n null) Float() float64 { panic(UnexpectedKind(semantic.Invalid, semantic.Float)) }
func (n null) Bool() bool { panic(UnexpectedKind(semantic.Invalid, semantic.Bool)) }
func (n null) Time() Time { panic(UnexpectedKind(semantic.Invalid, semantic.Time)) }
func (n null) Duration() Duration { panic(UnexpectedKind(semantic.Invalid, semantic.Duration)) }
func (n null) Regexp() *regexp.Regexp { panic(UnexpectedKind(semantic.Invalid, semantic.Regexp)) }
func (n null) Array() Array { panic(UnexpectedKind(semantic.Invalid, semantic.Array)) }
func (n null) Object() Object { panic(UnexpectedKind(semantic.Invalid, semantic.Object)) }
func (n null) Function() Function { panic(UnexpectedKind(semantic.Invalid, semantic.Function)) }
func (n null) Dict() Dictionary { panic(UnexpectedKind(semantic.Invalid, semantic.Dictionary)) }
func (n null) Equal(Value) bool { return false }