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package filter
import (
"errors"
"fmt"
)
// Value is a type that can represent a number, a string, or a boolean value.
type Value struct {
Number *int64
Text *string
Boolean *bool
}
// String returns a string representation of the value. If the value is nil, an empty
// string is returned.
func (v *Value) String() string {
if v == nil {
return ""
}
switch {
case v.Number != nil:
return fmt.Sprintf("%d", *v.Number)
case v.Text != nil:
return *v.Text
case v.Boolean != nil:
return fmt.Sprintf("%t", *v.Boolean)
default:
return ""
}
}
func (v *Value) tovalue(name string) (*value, error) {
if v != nil {
return &value{
Number: v.Number,
Text: v.Text,
Boolean: (*boolean)(v.Boolean),
}, nil
} else {
return &value{}, errors.New(fmt.Sprintf("\"%s\" is unknown", name))
}
}
// NumberValue creates a new Value instance that represents the given number.
func NumberValue(f int64) *Value {
return &Value{
Number: &f,
}
}
// TextValue creates a new Value instance that represents the given string.
func TextValue(s string) *Value {
return &Value{
Text: &s,
}
}
// BoolValue creates a new Value instance that represents the given boolean value.
func BoolValue(v bool) *Value {
b := bool(v)
return &Value{
Boolean: &b,
}
}
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