mirror of https://github.com/spf13/viper.git
42 lines
1.0 KiB
Go
42 lines
1.0 KiB
Go
package dotenv
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import (
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"strings"
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"github.com/spf13/cast"
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)
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// flattenAndMergeMap recursively flattens the given map into a new map
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// Code is based on the function with the same name in tha main package.
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// TODO: move it to a common place
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func flattenAndMergeMap(shadow map[string]interface{}, m map[string]interface{}, prefix string, delimiter string) map[string]interface{} {
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if shadow != nil && prefix != "" && shadow[prefix] != nil {
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// prefix is shadowed => nothing more to flatten
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return shadow
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}
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if shadow == nil {
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shadow = make(map[string]interface{})
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}
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var m2 map[string]interface{}
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if prefix != "" {
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prefix += delimiter
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}
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for k, val := range m {
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fullKey := prefix + k
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switch val.(type) {
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case map[string]interface{}:
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m2 = val.(map[string]interface{})
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case map[interface{}]interface{}:
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m2 = cast.ToStringMap(val)
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default:
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// immediate value
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shadow[strings.ToLower(fullKey)] = val
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continue
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}
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// recursively merge to shadow map
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shadow = flattenAndMergeMap(shadow, m2, fullKey, delimiter)
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}
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return shadow
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}
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