Use upstream libaddressinput in Chrome.

third_party/libaddressinput/chromium/json.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "cpp/src/util/json.h"
+#include "third_party/libaddressinput/src/cpp/src/util/json.h"
+
+#include <map>
+#include <utility>
 
 #include "base/basictypes.h"
 #include "base/json/json_reader.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/stl_util.h"
 #include "base/values.h"
 
 namespace i18n {
 namespace addressinput {
 
-namespace {
-
-// A base class for Chrome Json objects. JSON gets parsed into a
-// base::DictionaryValue and data is accessed via the Json interface.
-class ChromeJson : public Json {
+class Json::JsonImpl {
  public:
-  virtual bool GetStringValueForKey(const std::string& key, std::string* value)
-      const OVERRIDE;
-  virtual bool GetJsonValueForKey(const std::string& key,
-                                  scoped_ptr<Json>* value) const OVERRIDE;
- protected:
-  ChromeJson() {}
-  virtual ~ChromeJson() {}
-
-  virtual const base::DictionaryValue* GetDict() const = 0;
-
-  DISALLOW_COPY_AND_ASSIGN(ChromeJson);
-};
-
-// A Json object that will parse a string and own the parsed data.
-class JsonDataOwner : public ChromeJson {
- public:
-  JsonDataOwner() {}
-  virtual ~JsonDataOwner() {}
-
-  virtual bool ParseObject(const std::string& json) OVERRIDE {
-    dict_.reset();
-
-    // |json| is converted to a |c_str()| here because rapidjson and other parts
-    // of the standalone library use char* rather than std::string.
-    scoped_ptr<base::Value> parsed(base::JSONReader::Read(json.c_str()));
-    if (parsed && parsed->IsType(base::Value::TYPE_DICTIONARY))
-      dict_.reset(static_cast<base::DictionaryValue*>(parsed.release()));
-
-    return !!dict_;
+  // ::scoped_ptr is from "base/memory/scoped_ptr.h", which does not interfere
+  // with ::i18n::addressinput::scoped_ptr from
+  // <libaddressinput/util/scoped_ptr.h>

[Evan Stade, 2014/07/07 21:59:08]

remove this comment

[please use gerrit instead, 2014/07/08 22:47:59]

Done.

+  explicit JsonImpl(::scoped_ptr<const base::DictionaryValue> to_take_ownership)
+      : owned_(to_take_ownership.Pass()), not_owned_(owned_.get()) {
+    DCHECK(not_owned_);
+    InitKeys();
   }
 
- protected:
-  virtual const base::DictionaryValue* GetDict() const OVERRIDE {
-    return dict_.get();
+  explicit JsonImpl(const base::DictionaryValue* do_not_take_ownership)

[Evan Stade, 2014/07/07 21:59:08]

why not a const ref?

[please use gerrit instead, 2014/07/08 22:47:59]

Done.

+      : not_owned_(do_not_take_ownership) {
+    DCHECK(not_owned_);
+    InitKeys();
+  }
+
+  ~JsonImpl() {
+    STLDeleteValues(&dictionaries_);
+  }
+
+  const std::vector<std::string>& GetKeys() const { return keys_; }
+
+  bool GetStringValueForKey(const std::string& key, std::string* value) const {
+    return not_owned_->GetStringWithoutPathExpansion(key, value);
+  }
+
+  bool GetDictionaryValueForKey(const std::string& key,
+                                const base::DictionaryValue** value) const {
+    return not_owned_->GetDictionaryWithoutPathExpansion(key, value);
+  }
+
+  // The caller does not own the result. The result can be NULL if there's no
+  // dictionary for |key|.
+  const Json* FindDictionary(const std::string& key) const {
+    std::map<std::string, const Json*>::const_iterator it =
+        dictionaries_.find(key);
+    return it != dictionaries_.end() ? it->second : NULL;
+  }
+
+  // Takes ownership of |dictionary|. Should be called only once per |key| and
+  // per |dictionary|.
+  void AddDictionary(const std::string& key, const Json* dictionary) {
+    bool inserted =
+        dictionaries_.insert(std::make_pair(key, dictionary)).second;

[Evan Stade, 2014/07/07 21:59:08]

this whole function can be distilled down to:

if (!dictionaries_.insert(std::make_pair(key, dictionary)).second)
  NOTREACHED();

[please use gerrit instead, 2014/07/08 22:47:59]

This function is no longer necessary after moving all logic to JsonImpl and
making Json methods pass through to JsonImpl equivalents.

+    // Cannot do work inside of DCHECK(), because the compiler can optimize it
+    // away.
+    DCHECK(inserted);
+    // Avoid unused variable warning when DCHECK() is optimized away.
+    (void)inserted;
   }
 
  private:
-  scoped_ptr<base::DictionaryValue> dict_;
+  void InitKeys() {
+    DCHECK(keys_.empty());
+    for (base::DictionaryValue::Iterator it(*not_owned_); !it.IsAtEnd();
+         it.Advance()) {
+      keys_.push_back(it.key());
+    }
+  }
 
-  DISALLOW_COPY_AND_ASSIGN(JsonDataOwner);
+  const ::scoped_ptr<const base::DictionaryValue> owned_;
+  const base::DictionaryValue* const not_owned_;

[Evan Stade, 2014/07/07 21:59:07]

why not a const ref?

[please use gerrit instead, 2014/07/08 22:47:59]

Done.

+
+  // Owned JSON objects.
+  std::map<std::string, const Json*> dictionaries_;
+
+  std::vector<std::string> keys_;
+
+  DISALLOW_COPY_AND_ASSIGN(JsonImpl);
 };
 
-// A Json object which will point to data that's been parsed by a different
-// ChromeJson. It does not own its data and is only valid as long as its parent
-// ChromeJson is valid.
-class JsonDataCopy : public ChromeJson {
- public:
-  explicit JsonDataCopy(const base::DictionaryValue* dict) :
-      dict_(dict) {}
-  virtual ~JsonDataCopy() {}
-
-  virtual bool ParseObject(const std::string& json) OVERRIDE {
-    NOTREACHED();
-    return false;
-  }
-
- protected:
-  virtual const base::DictionaryValue* GetDict() const OVERRIDE {
-    return dict_;
-  }
-
- private:
-  const base::DictionaryValue* dict_;  // weak reference.
-
-  DISALLOW_COPY_AND_ASSIGN(JsonDataCopy);
-};
-
-// ChromeJson ------------------------------------------------------------------
-
-bool ChromeJson::GetStringValueForKey(const std::string& key,
-                                      std::string* value) const {
-  return GetDict()->GetStringWithoutPathExpansion(key, value);
-}
-
-bool ChromeJson::GetJsonValueForKey(const std::string& key,
-                                    scoped_ptr<Json>* value) const {
-  const base::DictionaryValue* sub_dict = NULL;
-  if (!GetDict()->GetDictionaryWithoutPathExpansion(key, &sub_dict) ||
-      !sub_dict) {
-    return false;
-  }
-
-  if (value)
-    value->reset(new JsonDataCopy(sub_dict));
-
-  return true;
-}
-
-}  // namespace
+Json::Json() {}
 
 Json::~Json() {}
 
-// static
-scoped_ptr<Json> Json::Build() {
-  return scoped_ptr<Json>(new JsonDataOwner);
+bool Json::ParseObject(const std::string& json) {
+  DCHECK(!impl_);
+
+  // |json| is converted to a |c_str()| here because rapidjson and other parts
+  // of the standalone library use char* rather than std::string.
+  ::scoped_ptr<const base::Value> parsed(base::JSONReader::Read(json.c_str()));
+  if (parsed && parsed->IsType(base::Value::TYPE_DICTIONARY)) {
+    ::scoped_ptr<const base::DictionaryValue> dict(
+        static_cast<const base::DictionaryValue*>(parsed.release()));
+    impl_.reset(new JsonImpl(dict.Pass()));
+  }
+
+  return !!impl_;
 }
 
-Json::Json() {}
+const std::vector<std::string>& Json::GetKeys() const {
+  DCHECK(impl_);
+  return impl_->GetKeys();
+}
+
+bool Json::HasStringValueForKey(const std::string& key) const {
+  DCHECK(impl_);
+  std::string not_used;
+  return impl_->GetStringValueForKey(key, &not_used);
+}
+
+std::string Json::GetStringValueForKey(const std::string& key) const {
+  DCHECK(impl_);
+  std::string value;
+  bool found = impl_->GetStringValueForKey(key, &value);

[Evan Stade, 2014/07/07 21:59:08]

ditto

[please use gerrit instead, 2014/07/08 22:47:59]

Done.

+  // Do not work inside of a DCHECK(), because it can be optimized away.
+  DCHECK(found);
+  // Avoid a compiler warning about unused variable when DCHECK() is optimized
+  // away.
+  (void)found;
+  return value;
+}
+
+bool Json::HasDictionaryValueForKey(const std::string& key) const {
+  DCHECK(impl_);
+
+  // The value returned by FindDictionary() is owned by impl_.
+  if (impl_->FindDictionary(key))
+    return true;
+
+  // Value is owned by impl_.
+  const base::DictionaryValue* value = NULL;
+  return impl_->GetDictionaryValueForKey(key, &value) && value;
+}
+
+const Json& Json::GetDictionaryValueForKey(const std::string& key) const {
+  DCHECK(impl_);
+
+  // The value returned by FindDictionary() is owned by impl_.

[Evan Stade, 2014/07/07 21:59:08]

I think it would be a bit less confusing if all the functionality were
concentrated in JsonImpl and the Json functions were pass-throughs

[please use gerrit instead, 2014/07/08 22:47:59]

Done.

+  const Json* existing_dictionary = impl_->FindDictionary(key);
+  if (existing_dictionary)
+    return *existing_dictionary;
+
+  // Value is owned by impl_.
+  const base::DictionaryValue* value = NULL;
+  bool found = impl_->GetDictionaryValueForKey(key, &value);

[Evan Stade, 2014/07/07 21:59:08]

ditto

[please use gerrit instead, 2014/07/08 22:47:59]

Done.

+  // Cannot do work inside of DCHECK(), because it can be optimized by the
+  // compiler.
+  DCHECK(found);
+  // Avoid a compiler warning about an unused variable when the DCHECK() is
+  // optimized away.
+  (void)found;
+  DCHECK(value);
+
+  // Dictionary is owned by impl_.
+  Json* dictionary = new Json;
+  dictionary->impl_.reset(new JsonImpl(value));
+  impl_->AddDictionary(key, dictionary);
+  return *dictionary;
+}
 
 }  // namespace addressinput
 }  // namespace i18n