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