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negate.go
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negate.go
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// Copyright 2017 Baliance. All rights reserved.
//
// Use of this source code is governed by the terms of the Affero GNU General
// Public License version 3.0 as published by the Free Software Foundation and
// appearing in the file LICENSE included in the packaging of this file. A
// commercial license can be purchased by contacting sales@baliance.com.
package formula
type Negate struct {
e Expression
}
func NewNegate(e Expression) Expression {
return Negate{e}
}
func (n Negate) Eval(ctx Context, ev Evaluator) Result {
r := n.e.Eval(ctx, ev)
if r.Type == ResultTypeNumber {
return MakeNumberResult(-r.ValueNumber)
}
return MakeErrorResult("NEGATE expected number argument")
}
func (n Negate) Reference(ctx Context, ev Evaluator) Reference {
return ReferenceInvalid
}