1 files changed, 211 insertions, 0 deletions
diff --git a/vendor/google.golang.org/api/gensupport/json.go b/vendor/google.golang.org/api/gensupport/json.go
new file mode 100644
index 000000000..c01e32189
--- /dev/null
+++ b/vendor/google.golang.org/api/gensupport/json.go
@@ -0,0 +1,211 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package gensupport
+
+import (
+	"encoding/json"
+	"fmt"
+	"reflect"
+	"strings"
+)
+
+// MarshalJSON returns a JSON encoding of schema containing only selected fields.
+// A field is selected if any of the following is true:
+//   * it has a non-empty value
+//   * its field name is present in forceSendFields and it is not a nil pointer or nil interface
+//   * its field name is present in nullFields.
+// The JSON key for each selected field is taken from the field's json: struct tag.
+func MarshalJSON(schema interface{}, forceSendFields, nullFields []string) ([]byte, error) {
+	if len(forceSendFields) == 0 && len(nullFields) == 0 {
+		return json.Marshal(schema)
+	}
+
+	mustInclude := make(map[string]bool)
+	for _, f := range forceSendFields {
+		mustInclude[f] = true
+	}
+	useNull := make(map[string]bool)
+	useNullMaps := make(map[string]map[string]bool)
+	for _, nf := range nullFields {
+		parts := strings.SplitN(nf, ".", 2)
+		field := parts[0]
+		if len(parts) == 1 {
+			useNull[field] = true
+		} else {
+			if useNullMaps[field] == nil {
+				useNullMaps[field] = map[string]bool{}
+			}
+			useNullMaps[field][parts[1]] = true
+		}
+	}
+
+	dataMap, err := schemaToMap(schema, mustInclude, useNull, useNullMaps)
+	if err != nil {
+		return nil, err
+	}
+	return json.Marshal(dataMap)
+}
+
+func schemaToMap(schema interface{}, mustInclude, useNull map[string]bool, useNullMaps map[string]map[string]bool) (map[string]interface{}, error) {
+	m := make(map[string]interface{})
+	s := reflect.ValueOf(schema)
+	st := s.Type()
+
+	for i := 0; i < s.NumField(); i++ {
+		jsonTag := st.Field(i).Tag.Get("json")
+		if jsonTag == "" {
+			continue
+		}
+		tag, err := parseJSONTag(jsonTag)
+		if err != nil {
+			return nil, err
+		}
+		if tag.ignore {
+			continue
+		}
+
+		v := s.Field(i)
+		f := st.Field(i)
+
+		if useNull[f.Name] {
+			if !isEmptyValue(v) {
+				return nil, fmt.Errorf("field %q in NullFields has non-empty value", f.Name)
+			}
+			m[tag.apiName] = nil
+			continue
+		}
+
+		if !includeField(v, f, mustInclude) {
+			continue
+		}
+
+		// If map fields are explicitly set to null, use a map[string]interface{}.
+		if f.Type.Kind() == reflect.Map && useNullMaps[f.Name] != nil {
+			ms, ok := v.Interface().(map[string]string)
+			if !ok {
+				return nil, fmt.Errorf("field %q has keys in NullFields but is not a map[string]string", f.Name)
+			}
+			mi := map[string]interface{}{}
+			for k, v := range ms {
+				mi[k] = v
+			}
+			for k := range useNullMaps[f.Name] {
+				mi[k] = nil
+			}
+			m[tag.apiName] = mi
+			continue
+		}
+
+		// nil maps are treated as empty maps.
+		if f.Type.Kind() == reflect.Map && v.IsNil() {
+			m[tag.apiName] = map[string]string{}
+			continue
+		}
+
+		// nil slices are treated as empty slices.
+		if f.Type.Kind() == reflect.Slice && v.IsNil() {
+			m[tag.apiName] = []bool{}
+			continue
+		}
+
+		if tag.stringFormat {
+			m[tag.apiName] = formatAsString(v, f.Type.Kind())
+		} else {
+			m[tag.apiName] = v.Interface()
+		}
+	}
+	return m, nil
+}
+
+// formatAsString returns a string representation of v, dereferencing it first if possible.
+func formatAsString(v reflect.Value, kind reflect.Kind) string {
+	if kind == reflect.Ptr && !v.IsNil() {
+		v = v.Elem()
+	}
+
+	return fmt.Sprintf("%v", v.Interface())
+}
+
+// jsonTag represents a restricted version of the struct tag format used by encoding/json.
+// It is used to describe the JSON encoding of fields in a Schema struct.
+type jsonTag struct {
+	apiName      string
+	stringFormat bool
+	ignore       bool
+}
+
+// parseJSONTag parses a restricted version of the struct tag format used by encoding/json.
+// The format of the tag must match that generated by the Schema.writeSchemaStruct method
+// in the api generator.
+func parseJSONTag(val string) (jsonTag, error) {
+	if val == "-" {
+		return jsonTag{ignore: true}, nil
+	}
+
+	var tag jsonTag
+
+	i := strings.Index(val, ",")
+	if i == -1 || val[:i] == "" {
+		return tag, fmt.Errorf("malformed json tag: %s", val)
+	}
+
+	tag = jsonTag{
+		apiName: val[:i],
+	}
+
+	switch val[i+1:] {
+	case "omitempty":
+	case "omitempty,string":
+		tag.stringFormat = true
+	default:
+		return tag, fmt.Errorf("malformed json tag: %s", val)
+	}
+
+	return tag, nil
+}
+
+// Reports whether the struct field "f" with value "v" should be included in JSON output.
+func includeField(v reflect.Value, f reflect.StructField, mustInclude map[string]bool) bool {
+	// The regular JSON encoding of a nil pointer is "null", which means "delete this field".
+	// Therefore, we could enable field deletion by honoring pointer fields' presence in the mustInclude set.
+	// However, many fields are not pointers, so there would be no way to delete these fields.
+	// Rather than partially supporting field deletion, we ignore mustInclude for nil pointer fields.
+	// Deletion will be handled by a separate mechanism.
+	if f.Type.Kind() == reflect.Ptr && v.IsNil() {
+		return false
+	}
+
+	// The "any" type is represented as an interface{}.  If this interface
+	// is nil, there is no reasonable representation to send.  We ignore
+	// these fields, for the same reasons as given above for pointers.
+	if f.Type.Kind() == reflect.Interface && v.IsNil() {
+		return false
+	}
+
+	return mustInclude[f.Name] || !isEmptyValue(v)
+}
+
+// isEmptyValue reports whether v is the empty value for its type.  This
+// implementation is based on that of the encoding/json package, but its
+// correctness does not depend on it being identical. What's important is that
+// this function return false in situations where v should not be sent as part
+// of a PATCH operation.
+func isEmptyValue(v reflect.Value) bool {
+	switch v.Kind() {
+	case reflect.Array, reflect.Map, reflect.Slice, reflect.String:
+		return v.Len() == 0
+	case reflect.Bool:
+		return !v.Bool()
+	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+		return v.Int() == 0
+	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
+		return v.Uint() == 0
+	case reflect.Float32, reflect.Float64:
+		return v.Float() == 0
+	case reflect.Interface, reflect.Ptr:
+		return v.IsNil()
+	}
+	return false
+}