Add ErrorConsole UI for Extension Install Warnings

extensions/browser/manifest_highlighter.h

+// 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.
+
+#ifndef EXTENSIONS_BROWSER_MANIFEST_HIGHLIGHTER_H_
+#define EXTENSIONS_BROWSER_MANIFEST_HIGHLIGHTER_H_
+
+#include <string>
+
+#include "base/basictypes.h"
+
+namespace extensions {
+
+// Use the ManifestHighlighter class to find the bounds of a feature in the
+// manifest. The manifest is parsed for the feature upon construction of the
+// object.
+// A feature can be at any level in the hierarchy. The "start" of a feature is
+// the first character of the feature name, or the beginning quote of the name,
+// if present. The "end" of a feature is wherever the next item at the same
+// level starts.
+// For instance, the bounds for the 'permissions' feature at the top level could
+// be '"permissions": { "tabs", "history", "downloads" }', but the feature for
+// 'tabs' within 'permissions' would just be '"tabs"'.
+// We can't use the JSONParser to do this, because we want to display the actual
+// manifest, and once we parse it into Values, we lose any formatting the user
+// may have had.
+// If a feature cannot be found, the feature will have zero-length.
+class ManifestHighlighter {
+ public:
+  ManifestHighlighter(const std::string& manifest,
+                      const std::string& key,
+                      const std::string& specific /* optional */);
+  ~ManifestHighlighter();
+
+  // Get the portion of the manifest which should not be highlighted and is
+  // before the feature.
+  std::string GetBeforeFeature() const;
+
+  // Get the feature portion of the manifest, which should be highlighted.
+  std::string GetFeature() const;
+
+  // Get the portion of the manifest which should not be highlighted and is
+  // after the feature.
+  std::string GetAfterFeature() const;
+
+ private:
+  // Called from the constructor; determine the start and end bounds of a
+  // feature, using both the key and specific information.
+  void Parse(const std::string& key, const std::string& specific);
+
+  // Find the bounds of any feature, either a full key or a specific item within
+  // the key. |enforce_at_top_level| means that the feature we find must be at
+  // the same level as |start_| (i.e., ignore nested elements).
+  // Returns true on success.
+  bool FindBounds(const std::string& feature, bool enforce_at_top_level);
+
+  // Finds the end of the feature.
+  void FindBoundsEnd(const std::string& feature, size_t local_start);
+
+  // The manifest we are parsing.
+  std::string manifest_;
+
+  // The start of the feature.
+  size_t start_;
+
+  // The end of the feature.
+  size_t end_;
+
+  DISALLOW_COPY_AND_ASSIGN(ManifestHighlighter);
+};
+
+}  // namespace extensions
+
+#endif  // EXTENSIONS_BROWSER_MANIFEST_HIGHLIGHTER_H_