handle unexported fields

csvstruct.go

@@ -1,8 +1,10 @@
 // TODO: struct tags
+// TODO: support DecodeNext(nil) to skip a line
 // TODO: NewEncoder/EncodeNext -- header will be fields in first item...
 // TODO: Encode/Decode map[string]string
 // TODO: Encode/Decode non-string values?
 
+// Package csvstruct provides methods to decode a CSV file into a struct.
 package csvstruct
 
 import (
@@ -13,6 +15,7 @@ import (
 	"reflect"
 )
 
+// Decoder reads and decodes CSV rows from an input stream.
 type Decoder interface {
 	DecodeNext(v interface{}) error
 }
@@ -22,12 +25,14 @@ type decoder struct {
 	r  csv.Reader
 }
 
+// NewDecoder returns a decoder that reads from r.
 func NewDecoder(r io.Reader) Decoder {
 	return &decoder{
 		r: *csv.NewReader(r),
 	}
 }
 
+// DecodeNext reads the next CSV-encoded value from its input and stores it in the value pointed to by v.
 func (d *decoder) DecodeNext(v interface{}) error {
 	rv := reflect.ValueOf(v)
 	if rv.Kind() != reflect.Ptr || rv.IsNil() {
@@ -58,7 +63,10 @@ func (d *decoder) DecodeNext(v interface{}) error {
 			continue
 		}
 		strv := line[idx]
-		rv.FieldByName(n).SetString(strv)
+		vf := rv.FieldByName(n)
+		if vf.CanSet() {
+			vf.SetString(strv)
+		}
 	}
 	return nil
 }