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null/zero/float.go at main · guregu/null · GitHub
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float.go
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package
zero
import
(
"database/sql"
"encoding/json"
"fmt"
"math"
"reflect"
"strconv"
"github.com/guregu/null/v6/internal"
)
// Float is a nullable float64. Zero input will be considered null.
// JSON marshals to zero if null.
// Considered null to SQL if zero.
type
Float
struct
{
sql.
NullFloat64
}
// NewFloat creates a new Float
func
NewFloat
(
f
float64
,
valid
bool
)
Float
{
return
Float
{
NullFloat64
: sql.
NullFloat64
{
Float64
:
f
,
Valid
:
valid
,
},
}
}
// FloatFrom creates a new Float that will be null if zero.
func
FloatFrom
(
f
float64
)
Float
{
return
NewFloat
(
f
,
f
!=
0
)
}
// FloatFromPtr creates a new Float that be null if f is nil.
func
FloatFromPtr
(
f
*
float64
)
Float
{
if
f
==
nil
{
return
NewFloat
(
0
,
false
)
}
return
NewFloat
(
*
f
,
true
)
}
// ValueOrZero returns the inner value if valid, otherwise zero.
func
(
f
Float
)
ValueOrZero
()
float64
{
if
!
f
.
Valid
{
return
0
}
return
f
.
Float64
}
// ValueOr returns the inner value if valid, otherwise v.
func
(
f
Float
)
ValueOr
(
v
float64
)
float64
{
if
!
f
.
Valid
{
return
v
}
return
f
.
Float64
}
// UnmarshalJSON implements json.Unmarshaler.
// It supports number and null input.
// 0 will be considered a null Float.
func
(
f
*
Float
)
UnmarshalJSON
(
data
[]
byte
)
error
{
err
:=
internal
.
UnmarshalFloatJSON
(
data
,
&
f
.
Float64
,
&
f
.
Valid
)
f
.
Valid
=
f
.
Float64
!=
0
return
err
}
// UnmarshalText implements encoding.TextUnmarshaler.
// It will unmarshal to a null Float if the input is blank or zero.
// It will return an error if the input is not a float, blank, or "null".
func
(
f
*
Float
)
UnmarshalText
(
text
[]
byte
)
error
{
str
:=
string
(
text
)
if
str
==
""
||
str
==
"null"
{
f
.
Valid
=
false
return
nil
}
var
err
error
f
.
Float64
,
err
=
strconv
.
ParseFloat
(
str
,
64
)
if
err
!=
nil
{
return
fmt
.
Errorf
(
"zero: couldn't unmarshal text: %w"
,
err
)
}
f
.
Valid
=
f
.
Float64
!=
0
return
err
}
// MarshalJSON implements json.Marshaler.
// It will encode null if this Float is null.
func
(
f
Float
)
MarshalJSON
() ([]
byte
,
error
) {
n
:=
f
.
Float64
if
!
f
.
Valid
{
n
=
0
}
if
math
.
IsInf
(
f
.
Float64
,
0
)
||
math
.
IsNaN
(
f
.
Float64
) {
return
nil
,
&
json.
UnsupportedValueError
{
Value
:
reflect
.
ValueOf
(
f
.
Float64
),
Str
:
strconv
.
FormatFloat
(
f
.
Float64
,
'g'
,
-
1
,
64
),
}
}
return
[]
byte
(
strconv
.
FormatFloat
(
n
,
'f'
,
-
1
,
64
)),
nil
}
// MarshalText implements encoding.TextMarshaler.
// It will encode a zero if this Float is null.
func
(
f
Float
)
MarshalText
() ([]
byte
,
error
) {
n
:=
f
.
Float64
if
!
f
.
Valid
{
n
=
0
}
return
[]
byte
(
strconv
.
FormatFloat
(
n
,
'f'
,
-
1
,
64
)),
nil
}
// SetValid changes this Float's value and also sets it to be non-null.
func
(
f
*
Float
)
SetValid
(
v
float64
) {
f
.
Float64
=
v
f
.
Valid
=
true
}
// Ptr returns a poFloater to this Float's value, or a nil poFloater if this Float is null.
func
(
f
Float
)
Ptr
()
*
float64
{
if
!
f
.
Valid
{
return
nil
}
return
&
f
.
Float64
}
// IsZero returns true for null or zero Floats, for future omitempty support (Go 1.4?)
func
(
f
Float
)
IsZero
()
bool
{
return
!
f
.
Valid
||
f
.
Float64
==
0
}
// Equal returns true if both floats have the same value or are both either null or zero.
// Warning: calculations using floating point numbers can result in different ways
// the numbers are stored in memory. Therefore, this function is not suitable to
// compare the result of a calculation. Use this method only to check if the value
// has changed in comparison to some previous value.
func
(
f
Float
)
Equal
(
other
Float
)
bool
{
return
f
.
ValueOrZero
()
==
other
.
ValueOrZero
()
}
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