Hide Builder, StringValue, and StringValueArray types.

No need to export these types.

decode.go

@@ -60,7 +60,7 @@ func (j *decoder) Array() { j.value = make([]interface{}, 0, 8) }
 
 func (j *decoder) Map() { j.value = make(map[string]interface{}) }
 
-func (j *decoder) Elem(i int) Builder {
+func (j *decoder) Elem(i int) builder {
 	v, ok := j.value.([]interface{})
 	if !ok {
 		v = make([]interface{}, 0, 8)
@@ -80,7 +80,7 @@ func (j *decoder) Elem(i int) Builder {
 	return newDecoder(v, i)
 }
 
-func (j *decoder) Key(s string) Builder {
+func (j *decoder) Key(s string) builder {
 	m, ok := j.value.(map[string]interface{})
 	if !ok {
 		m = make(map[string]interface{})

parse.go

@@ -18,8 +18,8 @@ import (
 // Parser
 //
 // Implements parsing but not the actions.  Those are
-// carried out by the implementation of the Builder interface.
-// A Builder represents the object being created.
+// carried out by the implementation of the builder interface.
+// A builder represents the object being created.
 // Calling a method like Int64(i) sets that object to i.
 // Calling a method like Elem(i) or Key(s) creates a
 // new builder for a subpiece of the object (logically,
@@ -32,10 +32,10 @@ import (
 // nested data structure, using the "map keys"
 // as struct field names.
 
-// A Builder is an interface implemented by clients and passed
+// A builder is an interface implemented by clients and passed
 // to the bencode parser.  It gives clients full control over the
 // eventual representation returned by the parser.
-type Builder interface {
+type builder interface {
 	// Set value
 	Int64(i int64)
 	Uint64(i uint64)
@@ -44,10 +44,10 @@ type Builder interface {
 	Map()
 
 	// Create sub-Builders
-	Elem(i int) Builder
-	Key(s string) Builder
+	Elem(i int) builder
+	Key(s string) builder
 
-	// Flush changes to parent Builder if necessary.
+	// Flush changes to parent builder if necessary.
 	Flush()
 }
 
@@ -97,7 +97,7 @@ func decodeString(r *bufio.Reader) (data string, err error) {
 	return
 }
 
-func parseFromReader(r *bufio.Reader, build Builder) (err error) {
+func parseFromReader(r *bufio.Reader, build builder) (err error) {
 	c, err := r.ReadByte()
 	if err != nil {
 		goto exit
@@ -195,6 +195,6 @@ exit:
 
 // Parse parses the bencode stream and makes calls to
 // the builder to construct a parsed representation.
-func parse(r io.Reader, builder Builder) (err error) {
+func parse(r io.Reader, builder builder) (err error) {
 	return parseFromReader(bufio.NewReader(r), builder)
 }

struct.go

@@ -145,7 +145,7 @@ func (b *structBuilder) Array() {
 	}
 }
 
-func (b *structBuilder) Elem(i int) Builder {
+func (b *structBuilder) Elem(i int) builder {
 	if b == nil || i < 0 {
 		return nobuilder
 	}
@@ -194,7 +194,7 @@ func (b *structBuilder) Map() {
 	}
 }
 
-func (b *structBuilder) Key(k string) Builder {
+func (b *structBuilder) Key(k string) builder {
 	if b == nil {
 		return nobuilder
 	}
@@ -332,22 +332,22 @@ func writeArrayOrSlice(w io.Writer, val reflect.Value) (err error) {
 	return nil
 }
 
-type StringValue struct {
+type stringValue struct {
 	key   string
 	value reflect.Value
 }
 
-type StringValueArray []StringValue
+type stringValueArray []stringValue
 
 // Satisfy sort.Interface
 
-func (a StringValueArray) Len() int { return len(a) }
+func (a stringValueArray) Len() int { return len(a) }
 
-func (a StringValueArray) Less(i, j int) bool { return a[i].key < a[j].key }
+func (a stringValueArray) Less(i, j int) bool { return a[i].key < a[j].key }
 
-func (a StringValueArray) Swap(i, j int) { a[i], a[j] = a[j], a[i] }
+func (a stringValueArray) Swap(i, j int) { a[i], a[j] = a[j], a[i] }
 
-func writeSVList(w io.Writer, svList StringValueArray) (err error) {
+func writeSVList(w io.Writer, svList stringValueArray) (err error) {
 	sort.Sort(svList)
 
 	for _, sv := range svList {
@@ -381,7 +381,7 @@ func writeMap(w io.Writer, val reflect.Value) (err error) {
 
 	// Sort keys
 
-	svList := make(StringValueArray, len(keys))
+	svList := make(stringValueArray, len(keys))
 	for i, key := range keys {
 		svList[i].key = key.String()
 		svList[i].value = val.MapIndex(key)
@@ -408,7 +408,7 @@ func writeStruct(w io.Writer, val reflect.Value) (err error) {
 	typ := val.Type()
 
 	numFields := val.NumField()
-	svList := make(StringValueArray, numFields)
+	svList := make(stringValueArray, numFields)
 
 	for i := 0; i < numFields; i++ {
 		field := typ.Field(i)