initial code repo

[stor4nfv.git] / src / ceph / src / dmclock / sim / src / ConfUtils.h

diff --git a/src/ceph/src/dmclock/sim/src/ConfUtils.h b/src/ceph/src/dmclock/sim/src/ConfUtils.h
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+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2011 New Dream Network
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+#ifndef CEPH_CONFUTILS_H
+#define CEPH_CONFUTILS_H
+
+#include <deque>
+#include <map>
+#include <set>
+#include <string>
+
+/*
+ * Ceph configuration file support.
+ *
+ * This class loads an INI-style configuration from a file or bufferlist, and
+ * holds it in memory. In general, an INI configuration file is composed of
+ * sections, which contain key/value pairs. You can put comments on the end of
+ * lines by using either a hash mark (#) or the semicolon (;).
+ *
+ * You can get information out of ConfFile by calling get_key or by examining
+ * individual sections.
+ *
+ * This class could be extended to support modifying configuration files and
+ * writing them back out without too much difficulty. Currently, this is not
+ * implemented, and the file is read-only.
+ */
+class ConfLine {
+public:
+  ConfLine(const std::string &key_, const std::string val_,
+          const std::string newsection_, const std::string comment_, int line_no_);
+  bool operator<(const ConfLine &rhs) const;
+  friend std::ostream &operator<<(std::ostream& oss, const ConfLine &l);
+
+  std::string key, val, newsection;
+};
+
+class ConfSection {
+public:
+  typedef std::set <ConfLine>::const_iterator const_line_iter_t;
+
+  std::set <ConfLine> lines;
+};
+
+class ConfFile {
+public:
+  typedef std::map <std::string, ConfSection>::iterator section_iter_t;
+  typedef std::map <std::string, ConfSection>::const_iterator const_section_iter_t;
+
+  ConfFile();
+  ~ConfFile();
+  void clear();
+  int parse_file(const std::string &fname, std::deque<std::string> *errors, std::ostream *warnings);
+  int read(const std::string &section, const std::string &key,
+             std::string &val) const;
+
+  const_section_iter_t sections_begin() const;
+  const_section_iter_t sections_end() const;
+
+  static void trim_whitespace(std::string &str, bool strip_internal);
+  static std::string normalize_key_name(const std::string &key);
+  friend std::ostream &operator<<(std::ostream &oss, const ConfFile &cf);
+
+private:
+  void load_from_buffer(const char *buf, size_t sz,
+                       std::deque<std::string> *errors, std::ostream *warnings);
+  static ConfLine* process_line(int line_no, const char *line,
+                               std::deque<std::string> *errors);
+
+  std::map <std::string, ConfSection> sections;
+};
+
+#endif