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33 lines
714 B
Go
33 lines
714 B
Go
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package govaluate
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import (
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"errors"
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)
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/*
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Parameters is a collection of named parameters that can be used by an EvaluableExpression to retrieve parameters
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when an expression tries to use them.
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*/
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type Parameters interface {
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/*
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Get gets the parameter of the given name, or an error if the parameter is unavailable.
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Failure to find the given parameter should be indicated by returning an error.
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*/
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Get(name string) (interface{}, error)
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}
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type MapParameters map[string]interface{}
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func (p MapParameters) Get(name string) (interface{}, error) {
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value, found := p[name]
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if !found {
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errorMessage := "No parameter '" + name + "' found."
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return nil, errors.New(errorMessage)
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}
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return value, nil
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}
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