Source file src/github.com/spf13/viper/internal/encoding/dotenv/map_utils.go

Documentation: github.com/spf13/viper/internal/encoding/dotenv

     1  package dotenv
     2  
     3  import (
     4  	"strings"
     5  
     6  	"github.com/spf13/cast"
     7  )
     8  
     9  // flattenAndMergeMap recursively flattens the given map into a new map
    10  // Code is based on the function with the same name in the main package.
    11  // TODO: move it to a common place.
    12  func flattenAndMergeMap(shadow, m map[string]any, prefix, delimiter string) map[string]any {
    13  	if shadow != nil && prefix != "" && shadow[prefix] != nil {
    14  		// prefix is shadowed => nothing more to flatten
    15  		return shadow
    16  	}
    17  	if shadow == nil {
    18  		shadow = make(map[string]any)
    19  	}
    20  
    21  	var m2 map[string]any
    22  	if prefix != "" {
    23  		prefix += delimiter
    24  	}
    25  	for k, val := range m {
    26  		fullKey := prefix + k
    27  		switch val := val.(type) {
    28  		case map[string]any:
    29  			m2 = val
    30  		case map[any]any:
    31  			m2 = cast.ToStringMap(val)
    32  		default:
    33  			// immediate value
    34  			shadow[strings.ToLower(fullKey)] = val
    35  			continue
    36  		}
    37  		// recursively merge to shadow map
    38  		shadow = flattenAndMergeMap(shadow, m2, fullKey, delimiter)
    39  	}
    40  	return shadow
    41  }
    42  

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