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// Package extensions implements a system for working with extended options.
package extensions
// Transformer functions for transforming payloads of an extension option into
// something that can be rendered by a template.
type Transformer func(payload interface{}) interface{}
var transformers = make(map[string]Transformer)
// SetTransformer sets the transformer function for the given extension name
func SetTransformer(extensionName string, f Transformer) {
transformers[extensionName] = f
}
// Transform the extensions using the registered transformers.
func Transform(extensions map[string]interface{}) map[string]interface{} {
if extensions == nil {
return nil
}
out := make(map[string]interface{}, len(extensions))
for name, payload := range extensions {
transform, ok := transformers[name]
if !ok {
// No transformer registered, skip.
continue
}
transformedPayload := transform(payload)
if transformedPayload == nil {
// Transformer returned nothing, skip.
continue
}
out[name] = transformedPayload
}
return out
}
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