Implement ManifestParser in content/.

content/renderer/manifest/manifest_parser.cc

Index: content/renderer/manifest/manifest_parser.cc
diff --git a/content/renderer/manifest/manifest_parser.cc b/content/renderer/manifest/manifest_parser.cc
new file mode 100644
index 0000000000000000000000000000000000000000..163d3432cfa698c30e994a2a9057418563e42ce3
--- /dev/null
+++ b/content/renderer/manifest/manifest_parser.cc
@@ -0,0 +1,84 @@
+// 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 "content/renderer/manifest/manifest_parser.h"
+
+#include "base/json/json_reader.h"
+#include "base/strings/nullable_string16.h"
+#include "base/strings/string_util.h"
+#include "base/strings/utf_string_conversions.h"
+#include "base/values.h"
+#include "content/public/common/manifest.h"
+
+namespace {
+
+// Parses the 'name' field of the manifest, as defined in:
+// http://w3c.github.io/manifest/#dfn-steps-for-processing-the-name-member
+// Returns the parsed string if any, a null string if the parsing failed.
+base::NullableString16 ParseName(const base::DictionaryValue& dictionary)  {
+  if (!dictionary.HasKey("name"))
+    return base::NullableString16();
+
+  base::string16 name;
+  if (!dictionary.GetString("name", &name)) {
+    // TODO(mlamouri): provide a custom message to the developer console.
+    return base::NullableString16();
+  }
+
+  base::TrimWhitespace(name, base::TRIM_ALL, &name);
+  return base::NullableString16(name, false);
+}
+
+// Parses the 'short_name' field of the manifest, as defined in:
+// http://w3c.github.io/manifest/#dfn-steps-for-processing-the-short-name-member
+// |short_name| is an out parameter that must not be null.
+// Returns the parsed string if any, a null string if the parsing failed.
+base::NullableString16 ParseShortName(
+    const base::DictionaryValue& dictionary)  {
+  if (!dictionary.HasKey("short_name"))
+    return base::NullableString16();
+
+  base::string16 short_name;
+  if (!dictionary.GetString("short_name", &short_name)) {
+    // TODO(mlamouri): provide a custom message to the developer console.
+    return base::NullableString16();
+  }
+
+  base::TrimWhitespace(short_name, base::TRIM_ALL, &short_name);
+  return base::NullableString16(short_name, false);
+}
+
+} // anonymous namespace
+
+namespace content {
+
+Manifest ManifestParser::Parse(const base::StringPiece& json) {
+  base::Value* value = base::JSONReader::Read(json);
+  if (!value) {
+    // TODO(mlamouri): get the JSON parsing error and report it to the developer
+    // console.
+    return Manifest();
+  }
+
+  if (value->GetType() != base::Value::TYPE_DICTIONARY) {
+    // TODO(mlamouri): provide a custom message to the developer console.
+    return Manifest();
+  }
+
+  base::DictionaryValue* dictionary = 0;
+  value->GetAsDictionary(&dictionary);
+  if (!dictionary) {
+    // TODO(mlamouri): provide a custom message to the developer console.
+    return Manifest();
+  }
+
+  Manifest manifest;
+
+  manifest.name = ParseName(*dictionary);
+  manifest.short_name = ParseShortName(*dictionary);
+
+  return manifest;
+}
+
+} // namespace content