1 // Copyright 2019 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "util/json/json_value.h"
6
7 namespace openscreen {
8
MaybeGetInt(const Json::Value & message,const char * first,const char * last)9 absl::optional<int> MaybeGetInt(const Json::Value& message,
10 const char* first,
11 const char* last) {
12 const Json::Value* value = message.find(first, last);
13 absl::optional<int> result;
14 if (value && value->isInt()) {
15 result = value->asInt();
16 }
17 return result;
18 }
19
MaybeGetString(const Json::Value & message)20 absl::optional<absl::string_view> MaybeGetString(const Json::Value& message) {
21 if (message.isString()) {
22 const char* begin = nullptr;
23 const char* end = nullptr;
24 message.getString(&begin, &end);
25 if (begin && end >= begin) {
26 return absl::string_view(begin, end - begin);
27 }
28 }
29 return absl::nullopt;
30 }
31
MaybeGetString(const Json::Value & message,const char * first,const char * last)32 absl::optional<absl::string_view> MaybeGetString(const Json::Value& message,
33 const char* first,
34 const char* last) {
35 const Json::Value* value = message.find(first, last);
36 absl::optional<absl::string_view> result;
37 if (value && value->isString()) {
38 return MaybeGetString(*value);
39 }
40 return result;
41 }
42
43 } // namespace openscreen
44