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-rw-r--r--Godeps/_workspace/src/github.com/awslabs/aws-sdk-go/aws/awsutil/path_value.go142
1 files changed, 142 insertions, 0 deletions
diff --git a/Godeps/_workspace/src/github.com/awslabs/aws-sdk-go/aws/awsutil/path_value.go b/Godeps/_workspace/src/github.com/awslabs/aws-sdk-go/aws/awsutil/path_value.go
new file mode 100644
index 000000000..ce4c5e27a
--- /dev/null
+++ b/Godeps/_workspace/src/github.com/awslabs/aws-sdk-go/aws/awsutil/path_value.go
@@ -0,0 +1,142 @@
+package awsutil
+
+import (
+ "reflect"
+ "regexp"
+ "strconv"
+ "strings"
+)
+
+var indexRe = regexp.MustCompile(`(.+)\[(-?\d+)?\]$`)
+
+func rValuesAtPath(v interface{}, path string, create bool) []reflect.Value {
+ pathparts := strings.Split(path, "||")
+ if len(pathparts) > 1 {
+ for _, pathpart := range pathparts {
+ vals := rValuesAtPath(v, pathpart, create)
+ if vals != nil && len(vals) > 0 {
+ return vals
+ }
+ }
+ return nil
+ }
+
+ values := []reflect.Value{reflect.Indirect(reflect.ValueOf(v))}
+ components := strings.Split(path, ".")
+ for len(values) > 0 && len(components) > 0 {
+ var index *int64
+ var indexStar bool
+ c := strings.TrimSpace(components[0])
+ if c == "" { // no actual component, illegal syntax
+ return nil
+ } else if c != "*" && strings.ToLower(c[0:1]) == c[0:1] {
+ // TODO normalize case for user
+ return nil // don't support unexported fields
+ }
+
+ // parse this component
+ if m := indexRe.FindStringSubmatch(c); m != nil {
+ c = m[1]
+ if m[2] == "" {
+ index = nil
+ indexStar = true
+ } else {
+ i, _ := strconv.ParseInt(m[2], 10, 32)
+ index = &i
+ indexStar = false
+ }
+ }
+
+ nextvals := []reflect.Value{}
+ for _, value := range values {
+ // pull component name out of struct member
+ if value.Kind() != reflect.Struct {
+ continue
+ }
+
+ if c == "*" { // pull all members
+ for i := 0; i < value.NumField(); i++ {
+ if f := reflect.Indirect(value.Field(i)); f.IsValid() {
+ nextvals = append(nextvals, f)
+ }
+ }
+ continue
+ }
+
+ value = value.FieldByName(c)
+ if create && value.Kind() == reflect.Ptr && value.IsNil() {
+ value.Set(reflect.New(value.Type().Elem()))
+ value = value.Elem()
+ } else {
+ value = reflect.Indirect(value)
+ }
+
+ if value.IsValid() {
+ nextvals = append(nextvals, value)
+ }
+ }
+ values = nextvals
+
+ if indexStar || index != nil {
+ nextvals = []reflect.Value{}
+ for _, value := range values {
+ value := reflect.Indirect(value)
+ if value.Kind() != reflect.Slice {
+ continue
+ }
+
+ if indexStar { // grab all indices
+ for i := 0; i < value.Len(); i++ {
+ idx := reflect.Indirect(value.Index(i))
+ if idx.IsValid() {
+ nextvals = append(nextvals, idx)
+ }
+ }
+ continue
+ }
+
+ // pull out index
+ i := int(*index)
+ if i >= value.Len() { // check out of bounds
+ if create {
+ // TODO resize slice
+ } else {
+ continue
+ }
+ } else if i < 0 { // support negative indexing
+ i = value.Len() + i
+ }
+ value = reflect.Indirect(value.Index(i))
+
+ if value.IsValid() {
+ nextvals = append(nextvals, value)
+ }
+ }
+ values = nextvals
+ }
+
+ components = components[1:]
+ }
+ return values
+}
+
+// ValuesAtPath returns a list of objects at the lexical path inside of a structure
+func ValuesAtPath(i interface{}, path string) []interface{} {
+ if rvals := rValuesAtPath(i, path, false); rvals != nil {
+ vals := make([]interface{}, len(rvals))
+ for i, rval := range rvals {
+ vals[i] = rval.Interface()
+ }
+ return vals
+ }
+ return nil
+}
+
+// SetValueAtPath sets an object at the lexical path inside of a structure
+func SetValueAtPath(i interface{}, path string, v interface{}) {
+ if rvals := rValuesAtPath(i, path, true); rvals != nil {
+ for _, rval := range rvals {
+ rval.Set(reflect.ValueOf(v))
+ }
+ }
+}