Add lower camel case

bootstrap/bootstrap.go

@@ -24,6 +24,7 @@ type Generator struct {
 
 	NoStdMarshalers bool
 	SnakeCase       bool
+	LowerCamelCase  bool
 	OmitEmpty       bool
 
 	OutName   string
@@ -110,6 +111,9 @@ func (g *Generator) writeMain() (path string, err error) {
 	if g.SnakeCase {
 		fmt.Fprintln(f, "  g.UseSnakeCase()")
 	}
+	if g.SnakeCase {
+		fmt.Fprintln(f, "  g.UseLowerCamelCase()")
+	}
 	if g.OmitEmpty {
 		fmt.Fprintln(f, "  g.OmitEmpty()")
 	}

easyjson/main.go

@@ -18,6 +18,7 @@ import (
 
 var buildTags = flag.String("build_tags", "", "build tags to add to generated file")
 var snakeCase = flag.Bool("snake_case", false, "use snake_case names instead of CamelCase by default")
+var lowerCamelCase = flag.Bool("lower_camel_case", false, "use lowerCamelCase names instead of CamelCase by default")
 var noStdMarshalers = flag.Bool("no_std_marshalers", false, "don't generate MarshalJSON/UnmarshalJSON funcs")
 var omitEmpty = flag.Bool("omit_empty", false, "omit empty fields by default")
 var allStructs = flag.Bool("all", false, "generate marshaler/unmarshalers for all structs in a file")
@@ -59,6 +60,7 @@ func generate(fname string) (err error) {
 		PkgName:         p.PkgName,
 		Types:           p.StructNames,
 		SnakeCase:       *snakeCase,
+		LowerCamelCase:  *lowerCamelCase,
 		NoStdMarshalers: *noStdMarshalers,
 		OmitEmpty:       *omitEmpty,
 		LeaveTemps:      *leaveTemps,

gen/generator.go

@@ -11,6 +11,7 @@ import (
 	"strconv"
 	"strings"
 	"unicode"
+	"unicode/utf8"
 )
 
 const pkgWriter = "github.com/mailru/easyjson/jwriter"
@@ -99,6 +100,11 @@ func (g *Generator) UseSnakeCase() {
 	g.fieldNamer = SnakeCaseFieldNamer{}
 }
 
+// UseLowerCamelCase sets lowerCamelCase field naming strategy.
+func (g *Generator) UseLowerCamelCase() {
+	g.fieldNamer = LowerCamelCaseFieldNamer{}
+}
+
 // NoStdMarshalers instructs not to generate standard MarshalJSON/UnmarshalJSON
 // methods (only the custom interface).
 func (g *Generator) NoStdMarshalers() {
@@ -374,6 +380,25 @@ func (DefaultFieldNamer) GetJSONFieldName(t reflect.Type, f reflect.StructField)
 	}
 }
 
+// LowerCamelCaseFieldNamer
+type LowerCamelCaseFieldNamer struct {}
+func lowerFirst(s string) string {
+	if s == "" {
+		return ""
+	}
+	r, n := utf8.DecodeRuneInString(s)
+	return string(unicode.ToLower(r)) + s[n:]
+}
+
+func (LowerCamelCaseFieldNamer) GetJSONFieldName(t reflect.Type, f reflect.StructField) string {
+	jsonName := strings.Split(f.Tag.Get("json"), ",")[0]
+	if jsonName != "" {
+		return jsonName
+	} else {
+		return lowerFirst(f.Name)
+	}
+}
+
 // SnakeCaseFieldNamer implements CamelCase to snake_case conversion for fields names.
 type SnakeCaseFieldNamer struct{}