Move Firefox importer's INI parser to c/browser/common.

base/ini_parser.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 BASE_INI_PARSER_H_
+#define BASE_INI_PARSER_H_
+
+#include <string>
+
+#include "base/base_export.h"
+#include "base/basictypes.h"
+#include "base/values.h"
+
+namespace base {
+
+// A simple class to parse INI files in a string. Users should in inherit from
+// this class. This is a very basic INI parser with these characteristics:
+//  - Ignores blank lines.
+//  - Ignores comment lines beginning with '#' or ';'.
+//  - Duplicate key names in the same section will simply cause repeated calls
+//    to HandleTriplet with the same |section| and |key| parameters.
+//  - No escape characters supported.
+//  - Global properties result in calls to HandleTriplet with an empty string in
+//    the |section| argument.
+//  - Section headers begin with a '[' character. It is recommended, but
+//    not required to close the header bracket with a ']' character. All
+//    characters after a closing ']' character is ignored.
+//  - Key value pairs are indicated with an '=' character. Whitespace is not
+//    ignored. Quoting is not supported. Everything before the first '='
+//    is considered the |key|, and everything after is the |value|.
+class BASE_EXPORT INIParser {
+ public:
+  INIParser();
+  virtual ~INIParser();
+
+  void Parse(const std::string& content);
+
+ private:
+  virtual void HandleTriplet(const std::string& section, const std::string& key,
+                             const std::string& value) = 0;
+
+  DISALLOW_COPY_AND_ASSIGN(INIParser);
+};
+
+// Parsed values are stored as strings at the "section.key" path. Triplets with
+// |section| or |key| parameters containing '.' are ignored.
+class BASE_EXPORT DictionaryValueINIParser : public INIParser {
+ public:
+  DictionaryValueINIParser();
+  virtual ~DictionaryValueINIParser();
+
+  const DictionaryValue& root() const { return root_; }
+
+ private:
+  virtual void HandleTriplet(const std::string& section, const std::string& key,
+                             const std::string& value) OVERRIDE;
+
+  DictionaryValue root_;
+
+  DISALLOW_COPY_AND_ASSIGN(DictionaryValueINIParser);
+};
+
+}  // namespace base
+
+#endif  // BASE_INI_PARSER_H_