Introduce gin_shell

gin/modules/file_module_provider.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 "gin/modules/file_module_provider.h"
+
+#include "base/bind.h"
+#include "base/file_util.h"
+#include "base/message_loop/message_loop.h"
+#include "base/strings/string_split.h"
+#include "gin/converter.h"
+
+namespace gin {
+
+namespace {
+
+void AttempToLoadModule(const base::WeakPtr<Runner>& runner,
+                        const base::FilePath& base,
+                        const std::string& id) {
+  if (!runner)
+    return;
+
+  std::vector<std::string> components;
+  base::SplitString(id, '/', &components);
+  base::FilePath path = base;
+  for (size_t i = 0; i < components.size(); ++i) {
+    // TODO(abarth): Technically the path components can be UTF-8. We don't
+    // handle that case correctly yet.
+    path = path.AppendASCII(components[i]);
+  }
+  path = path.AddExtension(FILE_PATH_LITERAL("js"));
+
+  std::string source;
+  if (!ReadFileToString(path, &source))
+    return;
+
+  Runner::Scope scope(runner.get());
+  v8::Handle<v8::Script> script = v8::Script::New(
+      StringToV8(runner->isolate(), source),
+      StringToV8(runner->isolate(), id));
+  runner->Run(script);
+}
+
+}  // namespace
+
+FileModuleProvider::FileModuleProvider(const base::FilePath& base)
+    : base_(base) {
+}
+
+FileModuleProvider::~FileModuleProvider() {
+}
+
+void FileModuleProvider::AttempToLoadModules(
+    Runner* runner, const std::set<std::string>& ids) {
+  std::set<std::string> modules = ids;
+  for (std::set<std::string>::const_iterator it = modules.begin();
+       it != modules.end(); ++it) {
+    const std::string& id = *it;
+    if (attempted_ids_.count(id))
+      continue;
+    attempted_ids_.insert(id);
+    base::MessageLoop::current()->PostTask(FROM_HERE,
+        base::Bind(AttempToLoadModule, runner->GetWeakPtr(), base_, id));
+  }
+}
+
+}  // namespace gin