55 lines
1.6 KiB
Go
55 lines
1.6 KiB
Go
// Mgmt
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// Copyright (C) 2013-2024+ James Shubin and the project contributors
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// Written by James Shubin <james@shubin.ca> and the project contributors
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package coremath
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import (
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"fmt"
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"math"
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"github.com/purpleidea/mgmt/lang/funcs/simple"
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"github.com/purpleidea/mgmt/lang/types"
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)
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func init() {
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simple.ModuleRegister(ModuleName, "pow", &types.FuncValue{
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T: types.NewType("func(x float, y float) float"),
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V: Pow,
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})
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}
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// Pow returns x ^ y, the base-x exponential of y.
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func Pow(input []types.Value) (types.Value, error) {
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x, y := input[0].Float(), input[1].Float()
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// FIXME: check for overflow
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z := math.Pow(x, y)
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if math.IsNaN(z) {
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return nil, fmt.Errorf("result is not a number")
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}
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if math.IsInf(z, 1) {
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return nil, fmt.Errorf("result is positive infinity")
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}
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if math.IsInf(z, -1) {
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return nil, fmt.Errorf("result is negative infinity")
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}
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// TODO: consider only returning floats, and adding isinf and
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// isnan functions so that users can decide for themselves...
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return &types.FloatValue{
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V: z,
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}, nil
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}
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