Source file src/github.com/json-iterator/go/extra/naming_strategy.go

Documentation: github.com/json-iterator/go/extra

     1  package extra
     2  
     3  import (
     4  	"github.com/json-iterator/go"
     5  	"strings"
     6  	"unicode"
     7  )
     8  
     9  // SetNamingStrategy rename struct fields uniformly
    10  func SetNamingStrategy(translate func(string) string) {
    11  	jsoniter.RegisterExtension(&namingStrategyExtension{jsoniter.DummyExtension{}, translate})
    12  }
    13  
    14  type namingStrategyExtension struct {
    15  	jsoniter.DummyExtension
    16  	translate func(string) string
    17  }
    18  
    19  func (extension *namingStrategyExtension) UpdateStructDescriptor(structDescriptor *jsoniter.StructDescriptor) {
    20  	for _, binding := range structDescriptor.Fields {
    21  		if unicode.IsLower(rune(binding.Field.Name()[0])) || binding.Field.Name()[0] == '_'{
    22  			continue
    23  		}
    24  		tag, hastag := binding.Field.Tag().Lookup("json")
    25  		if hastag {
    26  			tagParts := strings.Split(tag, ",")
    27  			if tagParts[0] == "-" {
    28  				continue // hidden field
    29  			}
    30  			if tagParts[0] != "" {
    31  				continue // field explicitly named
    32  			}
    33  		}
    34  		binding.ToNames = []string{extension.translate(binding.Field.Name())}
    35  		binding.FromNames = []string{extension.translate(binding.Field.Name())}
    36  	}
    37  }
    38  
    39  // LowerCaseWithUnderscores one strategy to SetNamingStrategy for. It will change HelloWorld to hello_world.
    40  func LowerCaseWithUnderscores(name string) string {
    41  	newName := []rune{}
    42  	for i, c := range name {
    43  		if i == 0 {
    44  			newName = append(newName, unicode.ToLower(c))
    45  		} else {
    46  			if unicode.IsUpper(c) {
    47  				newName = append(newName, '_')
    48  				newName = append(newName, unicode.ToLower(c))
    49  			} else {
    50  				newName = append(newName, c)
    51  			}
    52  		}
    53  	}
    54  	return string(newName)
    55  }
    56  

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