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30 lines
606 B
Go
30 lines
606 B
Go
package eval
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import (
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"errors"
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"strings"
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"github.com/Knetic/govaluate"
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)
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// EvaluateExpression evaulates a simple math expression string to a float64
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func EvaluateExpressionToFloat64(input string) (float64, error) {
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input = strings.TrimSpace(input) // remove trailing \0s
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if input == "" {
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return 0, nil
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}
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expression, err := govaluate.NewEvaluableExpression(input)
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if err != nil {
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return 0, err
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}
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result, err := expression.Evaluate(nil)
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if err != nil {
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return 0, err
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}
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f64, ok := result.(float64)
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if !ok {
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return 0, errors.New("could not type assert float64")
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}
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return f64, nil
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}
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