Add UI for RuntimeErrors in the ErrorConsole

extensions/browser/file_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_
+#ifndef EXTENSIONS_BROWSER_FILE_HIGHLIGHTER_H_
+#define EXTENSIONS_BROWSER_FILE_HIGHLIGHTER_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 
+namespace base {
+class DictionaryValue;
+}
+
 namespace extensions {
 
+// The FileHighlighter class is used in order to isolate and highlight a portion
+// of a given file (in string form). The Highlighter will split the source into
+// three portions: the portion before the highlighted feature, the highlighted
+// feature, and the portion following the highlighted feature.
+// The file will be parsed for highlighting upon construction of the Highlighter
+// object.
+class FileHighlighter {
+ public:
+  virtual ~FileHighlighter();
+
+  // 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;
+
+  // Populate a DictionaryValue with the highlighted portions (in UTF16) of the
+  // source file.
+  void SetHighlightedRegions(base::DictionaryValue* dict) const;
+
+ protected:
+  FileHighlighter(const std::string& contents);
+
+  // The contents of the file we are parsing.
+  std::string contents_;
+
+  // The start of the feature.
+  size_t start_;
+
+  // The end of the feature.
+  size_t end_;
+
+  DISALLOW_COPY_AND_ASSIGN(FileHighlighter);
+};
+
 // 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.
+// manifest.
 // 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 {
+class ManifestHighlighter : public FileHighlighter {
  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;
+  virtual ~ManifestHighlighter();
 
  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);
 };
 
+// Use the SourceHighlighter to highlight a particular line in a given source
+// file.
+class SourceHighlighter : public FileHighlighter {
+ public:
+  SourceHighlighter(const std::string& source, size_t line_number);
+  virtual ~SourceHighlighter();
+
+ private:
+  // Called from the constructor; determine the bounds of the line in the source
+  // file.
+  void Parse(size_t line_number);
+
+  DISALLOW_COPY_AND_ASSIGN(SourceHighlighter);
+};
+
 }  // namespace extensions
 
-#endif  // EXTENSIONS_BROWSER_MANIFEST_HIGHLIGHTER_H_
+#endif  // EXTENSIONS_BROWSER_FILE_HIGHLIGHTER_H_