Recursively load mojo packages

mojo/tools/package_manager/manifest.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 "mojo/tools/package_manager/manifest.h"
+
+#include "base/files/file_util.h"
+#include "base/json/json_reader.h"
+#include "base/values.h"
+#include "url/gurl.h"
+
+namespace mojo {
+
+Manifest::Manifest() {
+}
+
+Manifest::~Manifest() {
+}
+
+bool Manifest::Parse(const std::string& str, std::string* err_msg) {
+  int err_code = base::JSONReader::JSON_NO_ERROR;
+  scoped_ptr<base::Value> root(base::JSONReader::ReadAndReturnError(
+      str,
+      base::JSON_ALLOW_TRAILING_COMMAS,
+      &err_code, err_msg));
+  if (err_code != base::JSONReader::JSON_NO_ERROR)
+    return false;
+
+  const base::DictionaryValue* root_dict;
+  if (!root->GetAsDictionary(&root_dict)) {
+    *err_msg = "Manifest is not a dictionary.";
+    return false;
+  }
+
+  if (!PopulateDeps(root_dict, err_msg))
+    return false;
+
+  return true;
+}
+
+bool Manifest::ParseFromFile(const base::FilePath& file_name,
+                             std::string* err_msg) {
+  std::string data;
+  if (!base::ReadFileToString(file_name, &data)) {
+    *err_msg = "Couldn't read manifest file " + file_name.AsUTF8Unsafe();
+    return false;
+  }
+  return Parse(data, err_msg);
+}
+
+bool Manifest::PopulateDeps(const base::DictionaryValue* root,
+                            std::string* err_msg) {
+  const base::Value* deps_value;
+  if (!root->Get("deps", &deps_value))
+    return true;  // No deps, that's OK.
+
+  const base::ListValue* deps;
+  if (!deps_value->GetAsList(&deps)) {
+    *err_msg = "Deps is not a list. Should be \"deps\": [ \"...\", \"...\" ]";
+    return false;
+  }
+
+  deps_.reserve(deps->GetSize());
+  for (size_t i = 0; i < deps->GetSize(); i++) {
+    std::string cur_dep;
+    if (!deps->GetString(i, &cur_dep)) {
+      *err_msg = "Dependency list item wasn't a string.";
+      return false;
+    }
+
+    GURL cur_url(cur_dep);
+    if (!cur_url.is_valid()) {
+      *err_msg = "Dependency entry isn't a valid URL: " + cur_dep;
+      return false;
+    }
+
+    deps_.push_back(cur_url);
+  }
+
+  return true;
+}
+
+}  // namespace mojo