vendor/github.com/mailru/easyjson/gen/generator.go - cloudstack-kubernetes-provider - Git at Google

 package gen

 import (
 	"bytes"
 	"fmt"
 	"hash/fnv"
 	"io"
 	"path"
 	"reflect"
 	"sort"
 	"strconv"
 	"strings"
 	"unicode"
 )

 const pkgWriter = "github.com/mailru/easyjson/jwriter"
 const pkgLexer = "github.com/mailru/easyjson/jlexer"
 const pkgEasyJSON = "github.com/mailru/easyjson"

 // FieldNamer defines a policy for generating names for struct fields.
 type FieldNamer interface {
 	GetJSONFieldName(t reflect.Type, f reflect.StructField) string
 }

 // Generator generates the requested marshaler/unmarshalers.
 type Generator struct {
 	out *bytes.Buffer

 	pkgName    string
 	pkgPath    string
 	buildTags  string
 	hashString string

 	varCounter int

 	noStdMarshalers       bool
 	omitEmpty             bool
 	disallowUnknownFields bool
 	fieldNamer            FieldNamer

 	// package path to local alias map for tracking imports
 	imports map[string]string

 	// types that marshalers were requested for by user
 	marshalers map[reflect.Type]bool

 	// types that encoders were already generated for
 	typesSeen map[reflect.Type]bool

 	// types that encoders were requested for (e.g. by encoders of other types)
 	typesUnseen []reflect.Type

 	// function name to relevant type maps to track names of de-/encoders in
 	// case of a name clash or unnamed structs
 	functionNames map[string]reflect.Type
 }

 // NewGenerator initializes and returns a Generator.
 func NewGenerator(filename string) *Generator {
 	ret := &Generator{
 		imports: map[string]string{
 			pkgWriter:       "jwriter",
 			pkgLexer:        "jlexer",
 			pkgEasyJSON:     "easyjson",
 			"encoding/json": "json",
 		},
 		fieldNamer:    DefaultFieldNamer{},
 		marshalers:    make(map[reflect.Type]bool),
 		typesSeen:     make(map[reflect.Type]bool),
 		functionNames: make(map[string]reflect.Type),
 	}

 	// Use a file-unique prefix on all auxiliary funcs to avoid
 	// name clashes.
 	hash := fnv.New32()
 	hash.Write([]byte(filename))
 	ret.hashString = fmt.Sprintf("%x", hash.Sum32())

 	return ret
 }

 // SetPkg sets the name and path of output package.
 func (g *Generator) SetPkg(name, path string) {
 	g.pkgName = name
 	g.pkgPath = path
 }

 // SetBuildTags sets build tags for the output file.
 func (g *Generator) SetBuildTags(tags string) {
 	g.buildTags = tags
 }

 // SetFieldNamer sets field naming strategy.
 func (g *Generator) SetFieldNamer(n FieldNamer) {
 	g.fieldNamer = n
 }

 // UseSnakeCase sets snake_case field naming strategy.
 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() {
 	g.noStdMarshalers = true
 }

 // DisallowUnknownFields instructs not to skip unknown fields in json and return error.
 func (g *Generator) DisallowUnknownFields() {
 	g.disallowUnknownFields = true
 }

 // OmitEmpty triggers `json=",omitempty"` behaviour by default.
 func (g *Generator) OmitEmpty() {
 	g.omitEmpty = true
 }

 // addTypes requests to generate encoding/decoding funcs for the given type.
 func (g *Generator) addType(t reflect.Type) {
 	if g.typesSeen[t] {
 		return
 	}
 	for _, t1 := range g.typesUnseen {
 		if t1 == t {
 			return
 		}
 	}
 	g.typesUnseen = append(g.typesUnseen, t)
 }

 // Add requests to generate marshaler/unmarshalers and encoding/decoding
 // funcs for the type of given object.
 func (g *Generator) Add(obj interface{}) {
 	t := reflect.TypeOf(obj)
 	if t.Kind() == reflect.Ptr {
 		t = t.Elem()
 	}
 	g.addType(t)
 	g.marshalers[t] = true
 }

 // printHeader prints package declaration and imports.
 func (g *Generator) printHeader() {
 	if g.buildTags != "" {
 		fmt.Println("// +build ", g.buildTags)
 		fmt.Println()
 	}
 	fmt.Println("// Code generated by easyjson for marshaling/unmarshaling. DO NOT EDIT.")
 	fmt.Println()
 	fmt.Println("package ", g.pkgName)
 	fmt.Println()

 	byAlias := map[string]string{}
 	var aliases []string
 	for path, alias := range g.imports {
 		aliases = append(aliases, alias)
 		byAlias[alias] = path
 	}

 	sort.Strings(aliases)
 	fmt.Println("import (")
 	for _, alias := range aliases {
 		fmt.Printf("  %s %q\n", alias, byAlias[alias])
 	}

 	fmt.Println(")")
 	fmt.Println("")
 	fmt.Println("// suppress unused package warning")
 	fmt.Println("var (")
 	fmt.Println("   _ *json.RawMessage")
 	fmt.Println("   _ *jlexer.Lexer")
 	fmt.Println("   _ *jwriter.Writer")
 	fmt.Println("   _ easyjson.Marshaler")
 	fmt.Println(")")

 	fmt.Println()
 }

 // Run runs the generator and outputs generated code to out.
 func (g *Generator) Run(out io.Writer) error {
 	g.out = &bytes.Buffer{}

 	for len(g.typesUnseen) > 0 {
 		t := g.typesUnseen[len(g.typesUnseen)-1]
 		g.typesUnseen = g.typesUnseen[:len(g.typesUnseen)-1]
 		g.typesSeen[t] = true

 		if err := g.genDecoder(t); err != nil {
 			return err
 		}
 		if err := g.genEncoder(t); err != nil {
 			return err
 		}

 		if !g.marshalers[t] {
 			continue
 		}

 		if err := g.genStructMarshaler(t); err != nil {
 			return err
 		}
 		if err := g.genStructUnmarshaler(t); err != nil {
 			return err
 		}
 	}
 	g.printHeader()
 	_, err := out.Write(g.out.Bytes())
 	return err
 }

 // fixes vendored paths
 func fixPkgPathVendoring(pkgPath string) string {
 	const vendor = "/vendor/"
 	if i := strings.LastIndex(pkgPath, vendor); i != -1 {
 		return pkgPath[i+len(vendor):]
 	}
 	return pkgPath
 }

 func fixAliasName(alias string) string {
 	alias = strings.Replace(
 		strings.Replace(alias, ".", "_", -1),
 		"-",
 		"_",
 		-1,
 	)

 	if alias[0] == 'v' { // to void conflicting with var names, say v1
 		alias = "_" + alias
 	}
 	return alias
 }

 // pkgAlias creates and returns and import alias for a given package.
 func (g *Generator) pkgAlias(pkgPath string) string {
 	pkgPath = fixPkgPathVendoring(pkgPath)
 	if alias := g.imports[pkgPath]; alias != "" {
 		return alias
 	}

 	for i := 0; ; i++ {
 		alias := fixAliasName(path.Base(pkgPath))
 		if i > 0 {
 			alias += fmt.Sprint(i)
 		}

 		exists := false
 		for _, v := range g.imports {
 			if v == alias {
 				exists = true
 				break
 			}
 		}

 		if !exists {
 			g.imports[pkgPath] = alias
 			return alias
 		}
 	}
 }

 // getType return the textual type name of given type that can be used in generated code.
 func (g *Generator) getType(t reflect.Type) string {
 	if t.Name() == "" {
 		switch t.Kind() {
 		case reflect.Ptr:
 			return "*" + g.getType(t.Elem())
 		case reflect.Slice:
 			return "[]" + g.getType(t.Elem())
 		case reflect.Array:
 			return "[" + strconv.Itoa(t.Len()) + "]" + g.getType(t.Elem())
 		case reflect.Map:
 			return "map[" + g.getType(t.Key()) + "]" + g.getType(t.Elem())
 		}
 	}

 	if t.Name() == "" || t.PkgPath() == "" {
 		if t.Kind() == reflect.Struct {
 			// the fields of an anonymous struct can have named types,
 			// and t.String() will not be sufficient because it does not
 			// remove the package name when it matches g.pkgPath.
 			// so we convert by hand
 			nf := t.NumField()
 			lines := make([]string, 0, nf)
 			for i := 0; i < nf; i++ {
 				f := t.Field(i)
 				var line string
 				if !f.Anonymous {
 					line = f.Name + " "
 				} // else the field is anonymous (an embedded type)
 				line += g.getType(f.Type)
 				t := f.Tag
 				if t != "" {
 					line += " " + escapeTag(t)
 				}
 				lines = append(lines, line)
 			}
 			return strings.Join([]string{"struct { ", strings.Join(lines, "; "), " }"}, "")
 		}
 		return t.String()
 	} else if t.PkgPath() == g.pkgPath {
 		return t.Name()
 	}
 	return g.pkgAlias(t.PkgPath()) + "." + t.Name()
 }

 // escape a struct field tag string back to source code
 func escapeTag(tag reflect.StructTag) string {
 	t := string(tag)
 	if strings.ContainsRune(t, '`') {
 		// there are ` in the string; we can't use ` to enclose the string
 		return strconv.Quote(t)
 	}
 	return "`" + t + "`"
 }

 // uniqueVarName returns a file-unique name that can be used for generated variables.
 func (g *Generator) uniqueVarName() string {
 	g.varCounter++
 	return fmt.Sprint("v", g.varCounter)
 }

 // safeName escapes unsafe characters in pkg/type name and returns a string that can be used
 // in encoder/decoder names for the type.
 func (g *Generator) safeName(t reflect.Type) string {
 	name := t.PkgPath()
 	if t.Name() == "" {
 		name += "anonymous"
 	} else {
 		name += "." + t.Name()
 	}

 	parts := []string{}
 	part := []rune{}
 	for _, c := range name {
 		if unicode.IsLetter(c) || unicode.IsDigit(c) {
 			part = append(part, c)
 		} else if len(part) > 0 {
 			parts = append(parts, string(part))
 			part = []rune{}
 		}
 	}
 	return joinFunctionNameParts(false, parts...)
 }

 // functionName returns a function name for a given type with a given prefix. If a function
 // with this prefix already exists for a type, it is returned.
 //
 // Method is used to track encoder/decoder names for the type.
 func (g *Generator) functionName(prefix string, t reflect.Type) string {
 	prefix = joinFunctionNameParts(true, "easyjson", g.hashString, prefix)
 	name := joinFunctionNameParts(true, prefix, g.safeName(t))

 	// Most of the names will be unique, try a shortcut first.
 	if e, ok := g.functionNames[name]; !ok || e == t {
 		g.functionNames[name] = t
 		return name
 	}

 	// Search if the function already exists.
 	for name1, t1 := range g.functionNames {
 		if t1 == t && strings.HasPrefix(name1, prefix) {
 			return name1
 		}
 	}

 	// Create a new name in the case of a clash.
 	for i := 1; ; i++ {
 		nm := fmt.Sprint(name, i)
 		if _, ok := g.functionNames[nm]; ok {
 			continue
 		}
 		g.functionNames[nm] = t
 		return nm
 	}
 }

 // DefaultFieldsNamer implements trivial naming policy equivalent to encoding/json.
 type DefaultFieldNamer struct{}

 func (DefaultFieldNamer) GetJSONFieldName(t reflect.Type, f reflect.StructField) string {
 	jsonName := strings.Split(f.Tag.Get("json"), ",")[0]
 	if jsonName != "" {
 		return jsonName
 	} else {
 		return f.Name
 	}
 }

 // LowerCamelCaseFieldNamer
 type LowerCamelCaseFieldNamer struct{}

 func isLower(b byte) bool {
 	return b <= 122 && b >= 97
 }

 func isUpper(b byte) bool {
 	return b >= 65 && b <= 90
 }

 // convert HTTPRestClient to httpRestClient
 func lowerFirst(s string) string {
 	if s == "" {
 		return ""
 	}

 	str := ""
 	strlen := len(s)

 	/**
 	  Loop each char
 	  If is uppercase:
 	    If is first char, LOWER it
 	    If the following char is lower, LEAVE it
 	    If the following char is upper OR numeric, LOWER it
 	    If is the end of string, LEAVE it
 	  Else lowercase
 	*/

 	foundLower := false
 	for i := range s {
 		ch := s[i]
 		if isUpper(ch) {
 			if i == 0 {
 				str += string(ch + 32)
 			} else if !foundLower { // Currently just a stream of capitals, eg JSONRESTS[erver]
 				if strlen > (i+1) && isLower(s[i+1]) {
 					// Next char is lower, keep this a capital
 					str += string(ch)
 				} else {
 					// Either at end of string or next char is capital
 					str += string(ch + 32)
 				}
 			} else {
 				str += string(ch)
 			}
 		} else {
 			foundLower = true
 			str += string(ch)
 		}
 	}

 	return str
 }

 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{}

 func camelToSnake(name string) string {
 	var ret bytes.Buffer

 	multipleUpper := false
 	var lastUpper rune
 	var beforeUpper rune

 	for _, c := range name {
 		// Non-lowercase character after uppercase is considered to be uppercase too.
 		isUpper := (unicode.IsUpper(c) || (lastUpper != 0 && !unicode.IsLower(c)))

 		if lastUpper != 0 {
 			// Output a delimiter if last character was either the first uppercase character
 			// in a row, or the last one in a row (e.g. 'S' in "HTTPServer").
 			// Do not output a delimiter at the beginning of the name.

 			firstInRow := !multipleUpper
 			lastInRow := !isUpper

 			if ret.Len() > 0 && (firstInRow || lastInRow) && beforeUpper != '_' {
 				ret.WriteByte('_')
 			}
 			ret.WriteRune(unicode.ToLower(lastUpper))
 		}

 		// Buffer uppercase char, do not output it yet as a delimiter may be required if the
 		// next character is lowercase.
 		if isUpper {
 			multipleUpper = (lastUpper != 0)
 			lastUpper = c
 			continue
 		}

 		ret.WriteRune(c)
 		lastUpper = 0
 		beforeUpper = c
 		multipleUpper = false
 	}

 	if lastUpper != 0 {
 		ret.WriteRune(unicode.ToLower(lastUpper))
 	}
 	return string(ret.Bytes())
 }

 func (SnakeCaseFieldNamer) GetJSONFieldName(t reflect.Type, f reflect.StructField) string {
 	jsonName := strings.Split(f.Tag.Get("json"), ",")[0]
 	if jsonName != "" {
 		return jsonName
 	}

 	return camelToSnake(f.Name)
 }

 func joinFunctionNameParts(keepFirst bool, parts ...string) string {
 	buf := bytes.NewBufferString("")
 	for i, part := range parts {
 		if i == 0 && keepFirst {
 			buf.WriteString(part)
 		} else {
 			if len(part) > 0 {
 				buf.WriteString(strings.ToUpper(string(part[0])))
 			}
 			if len(part) > 1 {
 				buf.WriteString(part[1:])
 			}
 		}
 	}
 	return buf.String()
 }
	package gen

	import (
	"bytes"
	"fmt"
	"hash/fnv"
	"io"
	"path"
	"reflect"
	"sort"
	"strconv"
	"strings"
	"unicode"
	)

	const pkgWriter = "github.com/mailru/easyjson/jwriter"
	const pkgLexer = "github.com/mailru/easyjson/jlexer"
	const pkgEasyJSON = "github.com/mailru/easyjson"

	// FieldNamer defines a policy for generating names for struct fields.
	type FieldNamer interface {
	GetJSONFieldName(t reflect.Type, f reflect.StructField) string
	}

	// Generator generates the requested marshaler/unmarshalers.
	type Generator struct {
	out *bytes.Buffer

	pkgName string
	pkgPath string
	buildTags string
	hashString string

	varCounter int

	noStdMarshalers bool
	omitEmpty bool
	disallowUnknownFields bool
	fieldNamer FieldNamer

	// package path to local alias map for tracking imports
	imports map[string]string

	// types that marshalers were requested for by user
	marshalers map[reflect.Type]bool

	// types that encoders were already generated for
	typesSeen map[reflect.Type]bool

	// types that encoders were requested for (e.g. by encoders of other types)
	typesUnseen []reflect.Type

	// function name to relevant type maps to track names of de-/encoders in
	// case of a name clash or unnamed structs
	functionNames map[string]reflect.Type
	}

	// NewGenerator initializes and returns a Generator.
	func NewGenerator(filename string) *Generator {
	ret := &Generator{
	imports: map[string]string{
	pkgWriter: "jwriter",
	pkgLexer: "jlexer",
	pkgEasyJSON: "easyjson",
	"encoding/json": "json",
	},
	fieldNamer: DefaultFieldNamer{},
	marshalers: make(map[reflect.Type]bool),
	typesSeen: make(map[reflect.Type]bool),
	functionNames: make(map[string]reflect.Type),
	}

	// Use a file-unique prefix on all auxiliary funcs to avoid
	// name clashes.
	hash := fnv.New32()
	hash.Write([]byte(filename))
	ret.hashString = fmt.Sprintf("%x", hash.Sum32())

	return ret
	}

	// SetPkg sets the name and path of output package.
	func (g *Generator) SetPkg(name, path string) {
	g.pkgName = name
	g.pkgPath = path
	}

	// SetBuildTags sets build tags for the output file.
	func (g *Generator) SetBuildTags(tags string) {
	g.buildTags = tags
	}

	// SetFieldNamer sets field naming strategy.
	func (g *Generator) SetFieldNamer(n FieldNamer) {
	g.fieldNamer = n
	}

	// UseSnakeCase sets snake_case field naming strategy.
	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() {
	g.noStdMarshalers = true
	}

	// DisallowUnknownFields instructs not to skip unknown fields in json and return error.
	func (g *Generator) DisallowUnknownFields() {
	g.disallowUnknownFields = true
	}

	// OmitEmpty triggers `json=",omitempty"` behaviour by default.
	func (g *Generator) OmitEmpty() {
	g.omitEmpty = true
	}

	// addTypes requests to generate encoding/decoding funcs for the given type.
	func (g *Generator) addType(t reflect.Type) {
	if g.typesSeen[t] {
	return
	}
	for _, t1 := range g.typesUnseen {
	if t1 == t {
	return
	}
	}
	g.typesUnseen = append(g.typesUnseen, t)
	}

	// Add requests to generate marshaler/unmarshalers and encoding/decoding
	// funcs for the type of given object.
	func (g *Generator) Add(obj interface{}) {
	t := reflect.TypeOf(obj)
	if t.Kind() == reflect.Ptr {
	t = t.Elem()
	}
	g.addType(t)
	g.marshalers[t] = true
	}

	// printHeader prints package declaration and imports.
	func (g *Generator) printHeader() {
	if g.buildTags != "" {
	fmt.Println("// +build ", g.buildTags)
	fmt.Println()
	}
	fmt.Println("// Code generated by easyjson for marshaling/unmarshaling. DO NOT EDIT.")
	fmt.Println()
	fmt.Println("package ", g.pkgName)
	fmt.Println()

	byAlias := map[string]string{}
	var aliases []string
	for path, alias := range g.imports {
	aliases = append(aliases, alias)
	byAlias[alias] = path
	}

	sort.Strings(aliases)
	fmt.Println("import (")
	for _, alias := range aliases {
	fmt.Printf(" %s %q\n", alias, byAlias[alias])
	}

	fmt.Println(")")
	fmt.Println("")
	fmt.Println("// suppress unused package warning")
	fmt.Println("var (")
	fmt.Println(" _ *json.RawMessage")
	fmt.Println(" _ *jlexer.Lexer")
	fmt.Println(" _ *jwriter.Writer")
	fmt.Println(" _ easyjson.Marshaler")
	fmt.Println(")")

	fmt.Println()
	}

	// Run runs the generator and outputs generated code to out.
	func (g *Generator) Run(out io.Writer) error {
	g.out = &bytes.Buffer{}

	for len(g.typesUnseen) > 0 {
	t := g.typesUnseen[len(g.typesUnseen)-1]
	g.typesUnseen = g.typesUnseen[:len(g.typesUnseen)-1]
	g.typesSeen[t] = true

	if err := g.genDecoder(t); err != nil {
	return err
	}
	if err := g.genEncoder(t); err != nil {
	return err
	}

	if !g.marshalers[t] {
	continue
	}

	if err := g.genStructMarshaler(t); err != nil {
	return err
	}
	if err := g.genStructUnmarshaler(t); err != nil {
	return err
	}
	}
	g.printHeader()
	_, err := out.Write(g.out.Bytes())
	return err
	}

	// fixes vendored paths
	func fixPkgPathVendoring(pkgPath string) string {
	const vendor = "/vendor/"
	if i := strings.LastIndex(pkgPath, vendor); i != -1 {
	return pkgPath[i+len(vendor):]
	}
	return pkgPath
	}

	func fixAliasName(alias string) string {
	alias = strings.Replace(
	strings.Replace(alias, ".", "_", -1),
	"-",
	"_",
	-1,
	)

	if alias[0] == 'v' { // to void conflicting with var names, say v1
	alias = "_" + alias
	}
	return alias
	}

	// pkgAlias creates and returns and import alias for a given package.
	func (g *Generator) pkgAlias(pkgPath string) string {
	pkgPath = fixPkgPathVendoring(pkgPath)
	if alias := g.imports[pkgPath]; alias != "" {
	return alias
	}

	for i := 0; ; i++ {
	alias := fixAliasName(path.Base(pkgPath))
	if i > 0 {
	alias += fmt.Sprint(i)
	}

	exists := false
	for _, v := range g.imports {
	if v == alias {
	exists = true
	break
	}
	}

	if !exists {
	g.imports[pkgPath] = alias
	return alias
	}
	}
	}

	// getType return the textual type name of given type that can be used in generated code.
	func (g *Generator) getType(t reflect.Type) string {
	if t.Name() == "" {
	switch t.Kind() {
	case reflect.Ptr:
	return "*" + g.getType(t.Elem())
	case reflect.Slice:
	return "[]" + g.getType(t.Elem())
	case reflect.Array:
	return "[" + strconv.Itoa(t.Len()) + "]" + g.getType(t.Elem())
	case reflect.Map:
	return "map[" + g.getType(t.Key()) + "]" + g.getType(t.Elem())
	}
	}

	if t.Name() == "" \|\| t.PkgPath() == "" {
	if t.Kind() == reflect.Struct {
	// the fields of an anonymous struct can have named types,
	// and t.String() will not be sufficient because it does not
	// remove the package name when it matches g.pkgPath.
	// so we convert by hand
	nf := t.NumField()
	lines := make([]string, 0, nf)
	for i := 0; i < nf; i++ {
	f := t.Field(i)
	var line string
	if !f.Anonymous {
	line = f.Name + " "
	} // else the field is anonymous (an embedded type)
	line += g.getType(f.Type)
	t := f.Tag
	if t != "" {
	line += " " + escapeTag(t)
	}
	lines = append(lines, line)
	}
	return strings.Join([]string{"struct { ", strings.Join(lines, "; "), " }"}, "")
	}
	return t.String()
	} else if t.PkgPath() == g.pkgPath {
	return t.Name()
	}
	return g.pkgAlias(t.PkgPath()) + "." + t.Name()
	}

	// escape a struct field tag string back to source code
	func escapeTag(tag reflect.StructTag) string {
	t := string(tag)
	if strings.ContainsRune(t, '`') {
	// there are ` in the string; we can't use ` to enclose the string
	return strconv.Quote(t)
	}
	return "`" + t + "`"
	}

	// uniqueVarName returns a file-unique name that can be used for generated variables.
	func (g *Generator) uniqueVarName() string {
	g.varCounter++
	return fmt.Sprint("v", g.varCounter)
	}

	// safeName escapes unsafe characters in pkg/type name and returns a string that can be used
	// in encoder/decoder names for the type.
	func (g *Generator) safeName(t reflect.Type) string {
	name := t.PkgPath()
	if t.Name() == "" {
	name += "anonymous"
	} else {
	name += "." + t.Name()
	}

	parts := []string{}
	part := []rune{}
	for _, c := range name {
	if unicode.IsLetter(c) \|\| unicode.IsDigit(c) {
	part = append(part, c)
	} else if len(part) > 0 {
	parts = append(parts, string(part))
	part = []rune{}
	}
	}
	return joinFunctionNameParts(false, parts...)
	}

	// functionName returns a function name for a given type with a given prefix. If a function
	// with this prefix already exists for a type, it is returned.
	//
	// Method is used to track encoder/decoder names for the type.
	func (g *Generator) functionName(prefix string, t reflect.Type) string {
	prefix = joinFunctionNameParts(true, "easyjson", g.hashString, prefix)
	name := joinFunctionNameParts(true, prefix, g.safeName(t))

	// Most of the names will be unique, try a shortcut first.
	if e, ok := g.functionNames[name]; !ok \|\| e == t {
	g.functionNames[name] = t
	return name
	}

	// Search if the function already exists.
	for name1, t1 := range g.functionNames {
	if t1 == t && strings.HasPrefix(name1, prefix) {
	return name1
	}
	}

	// Create a new name in the case of a clash.
	for i := 1; ; i++ {
	nm := fmt.Sprint(name, i)
	if _, ok := g.functionNames[nm]; ok {
	continue
	}
	g.functionNames[nm] = t
	return nm
	}
	}

	// DefaultFieldsNamer implements trivial naming policy equivalent to encoding/json.
	type DefaultFieldNamer struct{}

	func (DefaultFieldNamer) GetJSONFieldName(t reflect.Type, f reflect.StructField) string {
	jsonName := strings.Split(f.Tag.Get("json"), ",")[0]
	if jsonName != "" {
	return jsonName
	} else {
	return f.Name
	}
	}

	// LowerCamelCaseFieldNamer
	type LowerCamelCaseFieldNamer struct{}

	func isLower(b byte) bool {
	return b <= 122 && b >= 97
	}

	func isUpper(b byte) bool {
	return b >= 65 && b <= 90
	}

	// convert HTTPRestClient to httpRestClient
	func lowerFirst(s string) string {
	if s == "" {
	return ""
	}

	str := ""
	strlen := len(s)

	/**
	Loop each char
	If is uppercase:
	If is first char, LOWER it
	If the following char is lower, LEAVE it
	If the following char is upper OR numeric, LOWER it
	If is the end of string, LEAVE it
	Else lowercase
	*/

	foundLower := false
	for i := range s {
	ch := s[i]
	if isUpper(ch) {
	if i == 0 {
	str += string(ch + 32)
	} else if !foundLower { // Currently just a stream of capitals, eg JSONRESTS[erver]
	if strlen > (i+1) && isLower(s[i+1]) {
	// Next char is lower, keep this a capital
	str += string(ch)
	} else {
	// Either at end of string or next char is capital
	str += string(ch + 32)
	}
	} else {
	str += string(ch)
	}
	} else {
	foundLower = true
	str += string(ch)
	}
	}

	return str
	}

	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{}

	func camelToSnake(name string) string {
	var ret bytes.Buffer

	multipleUpper := false
	var lastUpper rune
	var beforeUpper rune

	for _, c := range name {
	// Non-lowercase character after uppercase is considered to be uppercase too.
	isUpper := (unicode.IsUpper(c) \|\| (lastUpper != 0 && !unicode.IsLower(c)))

	if lastUpper != 0 {
	// Output a delimiter if last character was either the first uppercase character
	// in a row, or the last one in a row (e.g. 'S' in "HTTPServer").
	// Do not output a delimiter at the beginning of the name.

	firstInRow := !multipleUpper
	lastInRow := !isUpper

	if ret.Len() > 0 && (firstInRow \|\| lastInRow) && beforeUpper != '_' {
	ret.WriteByte('_')
	}
	ret.WriteRune(unicode.ToLower(lastUpper))
	}

	// Buffer uppercase char, do not output it yet as a delimiter may be required if the
	// next character is lowercase.
	if isUpper {
	multipleUpper = (lastUpper != 0)
	lastUpper = c
	continue
	}

	ret.WriteRune(c)
	lastUpper = 0
	beforeUpper = c
	multipleUpper = false
	}

	if lastUpper != 0 {
	ret.WriteRune(unicode.ToLower(lastUpper))
	}
	return string(ret.Bytes())
	}

	func (SnakeCaseFieldNamer) GetJSONFieldName(t reflect.Type, f reflect.StructField) string {
	jsonName := strings.Split(f.Tag.Get("json"), ",")[0]
	if jsonName != "" {
	return jsonName
	}

	return camelToSnake(f.Name)
	}

	func joinFunctionNameParts(keepFirst bool, parts ...string) string {
	buf := bytes.NewBufferString("")
	for i, part := range parts {
	if i == 0 && keepFirst {
	buf.WriteString(part)
	} else {
	if len(part) > 0 {
	buf.WriteString(strings.ToUpper(string(part[0])))
	}
	if len(part) > 1 {
	buf.WriteString(part[1:])
	}
	}
	}
	return buf.String()
	}