Add a class to parse answer json.

components/omnibox/suggestion_answer.cc

+// Copyright 2014 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 "components/omnibox/suggestion_answer.h"
+
+#include "base/json/json_reader.h"
+#include "base/strings/string_util.h"
+#include "base/strings/utf_string_conversions.h"
+#include "base/values.h"
+#include "url/url_constants.h"
+
+namespace {
+
+// All of these are defined here (even though they're only used once each) so
+// the format details are easy to locate and update or compare to the spec doc.
+static const char* kAnswerJsonLines = "l";
+static const char* kAnswerJsonImageLine = "il";
+static const char* kAnswerJsonText = "t";
+static const char* kAnswerJsonAdditionalText = "at";
+static const char* kAnswerJsonStatusText = "st";
+static const char* kAnswerJsonTextType = "tt";
+static const char* kAnswerJsonImage = "i";
+static const char* kAnswerJsonImageData = "i.d";
+
+}  // namespace
+
+// SuggestionAnswer::TextField -------------------------------------------------
+
+SuggestionAnswer::TextField::TextField() : type_(-1) {}
+SuggestionAnswer::TextField::~TextField() {}
+
+// static
+void SuggestionAnswer::TextField::ParseTextField(
+    const base::DictionaryValue* field_json, TextField* text_field) {
+  if (!field_json->GetString(kAnswerJsonText, &text_field->text_) ||
+      text_field->text_.empty())
+    return;
+  field_json->GetInteger(kAnswerJsonTextType, &text_field->type_);
+}
+
+bool SuggestionAnswer::TextField::Equals(const TextField& field) const {
+  return type_ == field.type_ && text_ == field.text_;
+}
+
+void SuggestionAnswer::TextField::Clear() {
+  text_.clear();
+  type_ = -1;
+}
+
+// SuggestionAnswer::ImageLine -------------------------------------------------
+
+SuggestionAnswer::ImageLine::ImageLine() : is_valid_(false) {}
+SuggestionAnswer::ImageLine::~ImageLine() {}
+
+// static
+void SuggestionAnswer::ImageLine::ParseImageLine(
+    const base::DictionaryValue* line_json, ImageLine* image_line) {
+  image_line->is_valid_ = false;
+
+  const base::DictionaryValue* inner_json;
+  if (!line_json->GetDictionary(kAnswerJsonImageLine, &inner_json))
+    return;
+
+  const base::ListValue* fields_json;
+  if (!inner_json->GetList(kAnswerJsonText, &fields_json) ||
+      fields_json->GetSize() == 0)
+    return;
+
+  for (size_t i = 0; i < fields_json->GetSize(); ++i) {
+    const base::DictionaryValue* field_json;
+    TextField text_field;
+    if (!fields_json->GetDictionary(i, &field_json))
+      return;
+    TextField::ParseTextField(field_json, &text_field);
+    if (!text_field.is_valid())
+      return;
+    image_line->text_fields_.push_back(text_field);
+  }
+
+  if (inner_json->HasKey(kAnswerJsonAdditionalText)) {
+    const base::DictionaryValue* field_json;
+    if (!inner_json->GetDictionary(kAnswerJsonAdditionalText, &field_json))
+      return;
+    TextField::ParseTextField(field_json, &image_line->additional_text_);
+    if (!image_line->additional_text_.is_valid())
+      return;
+  }
+
+  if (inner_json->HasKey(kAnswerJsonStatusText)) {
+    const base::DictionaryValue* field_json;
+    if (!inner_json->GetDictionary(kAnswerJsonStatusText, &field_json))
+      return;
+    TextField::ParseTextField(field_json, &image_line->status_text_);
+    if (!image_line->status_text_.is_valid())
+      return;
+  }
+
+  if (inner_json->HasKey(kAnswerJsonImage)) {
+    base::string16 url_string;
+    if (!inner_json->GetString(kAnswerJsonImageData, &url_string) ||
+        url_string.empty())
+      return;
+    // If necessary, concatenate scheme and host/path using only ':' as
+    // separator. This is due to the results delivering strings of the form
+    // "//host/path", which is web-speak for "use the enclosing page's scheme",
+    // but not a valid path of an URL.  The GWS frontend commonly (always?)
+    // redirects to HTTPS so we just default to that here.
+    image_line->image_url_ = GURL(
+        StartsWith(url_string, base::ASCIIToUTF16("//"), false) ?
+            (base::ASCIIToUTF16(url::kHttpsScheme) + base::ASCIIToUTF16(":") +
+                url_string) :
+            url_string);
+
+    if (!image_line->image_url_.is_valid())
+      return;
+  }
+
+  image_line->is_valid_ = true;
+}
+
+bool SuggestionAnswer::ImageLine::Equals(const ImageLine& line) const {
+  if (text_fields_.size() != line.text_fields_.size())
+    return false;
+  for (size_t i = 0; i < text_fields_.size(); ++i) {
+    if (!text_fields_[i].Equals(line.text_fields_[i]))
+      return false;
+  }
+  return additional_text_.Equals(line.additional_text_) &&
+         status_text_.Equals(line.status_text_) &&
+         image_url_ == line.image_url_;
+}
+
+void SuggestionAnswer::ImageLine::Clear() {
+  text_fields_.clear();
+  additional_text_.Clear();
+  status_text_.Clear();
+  image_url_ = GURL();
+  is_valid_ = false;
+}
+
+// SuggestionAnswer ------------------------------------------------------------
+
+SuggestionAnswer::SuggestionAnswer() : type_(-1) {}
+SuggestionAnswer::~SuggestionAnswer() {}
+
+// static
+void SuggestionAnswer::ParseAnswer(
+    const std::string& answer_json, SuggestionAnswer* answer) {
+  scoped_ptr<base::Value> value(base::JSONReader::Read(answer_json));
+  base::DictionaryValue* dict;
+  if (!value.get() || !value->GetAsDictionary(&dict))
+    return;
+
+  ParseAnswer(dict, answer);
+}
+
+// static
+void SuggestionAnswer::ParseAnswer(
+    const base::DictionaryValue* answer_json, SuggestionAnswer* answer) {
+  const base::ListValue* lines_json;
+  if (!answer_json->GetList(kAnswerJsonLines, &lines_json) ||
+      lines_json->GetSize() != 2)
+    return;
+
+  const base::DictionaryValue* first_line_json;
+  if (!lines_json->GetDictionary(0, &first_line_json)) {
+    answer->Clear();
+    return;
+  }
+  ImageLine::ParseImageLine(first_line_json, &answer->first_line_);
+  if (!answer->first_line_.is_valid()) {
+    answer->Clear();
+    return;
+  }
+
+  const base::DictionaryValue* second_line_json;
+  if (!lines_json->GetDictionary(1, &second_line_json)) {
+    answer->Clear();
+    return;
+  }
+  ImageLine::ParseImageLine(second_line_json, &answer->second_line_);
+  if (!answer->second_line_.is_valid()) {
+    answer->Clear();
+    return;
+  }
+}
+
+bool SuggestionAnswer::Equals(const SuggestionAnswer& answer) const {
+  return type_ == answer.type_ &&
+         first_line_.Equals(answer.first_line_) &&
+         second_line_.Equals(answer.second_line_);
+}
+
+void SuggestionAnswer::Clear() {
+  first_line_.Clear();
+  second_line_.Clear();
+  type_ = -1;
+}
+
+void SuggestionAnswer::GetImageURLs(std::vector<GURL>* urls) const {
+  urls->clear();
+
+  if (!is_valid())
+    return;
+
+  if (first_line_.has_image_url())
+    urls->push_back(first_line_.image_url());
+  if (second_line_.has_image_url())
+    urls->push_back(second_line_.image_url());
+}