comparison DEPENDENCIES/generic/include/boost/date_time/period_parser.hpp @ 16:2665513ce2d3

Add boost headers

+
+#ifndef DATETIME_PERIOD_PARSER_HPP___
+#define DATETIME_PERIOD_PARSER_HPP___
+
+/* Copyright (c) 2002-2004 CrystalClear Software, Inc.
+ * Use, modification and distribution is subject to the 
+ * Boost Software License, Version 1.0. (See accompanying
+ * file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
+ * Author: Jeff Garland, Bart Garst
+ * $Date: 2008-11-13 12:10:23 -0800 (Thu, 13 Nov 2008) $
+ */
+
+#include <boost/throw_exception.hpp>
+#include <boost/date_time/string_parse_tree.hpp>
+#include <boost/date_time/string_convert.hpp>
+
+
+namespace boost { namespace date_time {
+
+
+  //! Not a facet, but a class used to specify and control period parsing 
+  /*! Provides settings for the following:
+   *   - period_separator -- default '/'
+   *   - period_open_start_delimeter -- default '['
+   *   - period_open_range_end_delimeter -- default ')' 
+   *   - period_closed_range_end_delimeter -- default ']' 
+   *   - display_as_open_range, display_as_closed_range -- default closed_range
+   *
+   *  For a typical date_period, the contents of the input stream would be
+   *@code
+   *  [2004-Jan-04/2004-Feb-01]
+   *@endcode
+   * where the date format is controlled by the date facet
+   */
+  template<class date_type, typename CharT>
+  class period_parser {
+  public:
+    typedef std::basic_string<CharT> string_type;
+    typedef CharT                    char_type;
+    //typedef typename std::basic_string<char_type>::const_iterator const_itr_type;
+    typedef std::istreambuf_iterator<CharT> stream_itr_type;
+    typedef string_parse_tree<CharT> parse_tree_type;
+    typedef typename parse_tree_type::parse_match_result_type match_results;
+    typedef std::vector<std::basic_string<CharT> > collection_type;
+
+    static const char_type default_period_separator[2];
+    static const char_type default_period_start_delimeter[2];
+    static const char_type default_period_open_range_end_delimeter[2];
+    static const char_type default_period_closed_range_end_delimeter[2];
+
+    enum period_range_option { AS_OPEN_RANGE, AS_CLOSED_RANGE };
+
+    //! Constructor that sets up period parser options
+    period_parser(period_range_option range_opt = AS_CLOSED_RANGE,
+                  const char_type* const period_separator = default_period_separator,
+                  const char_type* const period_start_delimeter = default_period_start_delimeter,
+                  const char_type* const period_open_range_end_delimeter = default_period_open_range_end_delimeter,
+                  const char_type* const period_closed_range_end_delimeter = default_period_closed_range_end_delimeter)
+      : m_range_option(range_opt)
+    {
+      delimiters.push_back(string_type(period_separator));
+      delimiters.push_back(string_type(period_start_delimeter));
+      delimiters.push_back(string_type(period_open_range_end_delimeter));
+      delimiters.push_back(string_type(period_closed_range_end_delimeter));
+    }
+
+    period_parser(const period_parser<date_type,CharT>& p_parser)
+    {
+      this->delimiters = p_parser.delimiters;
+      this->m_range_option = p_parser.m_range_option;
+    }
+
+    period_range_option range_option() const
+    {
+      return m_range_option;
+    }
+    void range_option(period_range_option option)
+    {
+      m_range_option = option;
+    }
+    collection_type delimiter_strings() const
+    {
+      return delimiters;
+    }
+    void delimiter_strings(const string_type& separator,
+                           const string_type& start_delim,
+                           const string_type& open_end_delim,
+                           const string_type& closed_end_delim)
+    {
+      delimiters.clear();
+      delimiters.push_back(separator);
+      delimiters.push_back(start_delim);
+      delimiters.push_back(open_end_delim);
+      delimiters.push_back(closed_end_delim);
+    }
+
+    //! Generic code to parse a period -- no matter the period type.
+    /*! This generic code will parse any period using a facet to
+     *  to get the 'elements'.  For example, in the case of a date_period
+     *  the elements will be instances of a date which will be parsed
+     *  according the to setup in the passed facet parameter.
+     * 
+     *  The steps for parsing a period are always the same:
+     *  - consume the start delimiter
+     *  - get start element
+     *  - consume the separator 
+     *  - get either last or end element depending on range settings
+     *  - consume the end delimeter depending on range settings
+     *
+     *  Thus for a typical date period the contents of the input stream
+     *  might look like this:
+     *@code
+     *
+     *    [March 01, 2004/June 07, 2004]   <-- closed range
+     *    [March 01, 2004/June 08, 2004)   <-- open range
+     *
+     *@endcode
+     */
+    template<class period_type, class duration_type, class facet_type>
+    period_type get_period(stream_itr_type& sitr, 
+                           stream_itr_type& stream_end,
+                           std::ios_base& a_ios, 
+                           const period_type& /* p */,
+                           const duration_type& dur_unit,
+                           const facet_type& facet) const 
+    {
+      // skip leading whitespace
+      while(std::isspace(*sitr) && sitr != stream_end) { ++sitr; } 
+
+      typedef typename period_type::point_type point_type;
+      point_type p1(not_a_date_time), p2(not_a_date_time);
+
+
+      consume_delim(sitr, stream_end, delimiters[START]);       // start delim
+      facet.get(sitr, stream_end, a_ios, p1);                   // first point
+      consume_delim(sitr, stream_end, delimiters[SEPARATOR]);   // separator
+      facet.get(sitr, stream_end, a_ios, p2);                   // second point
+
+      // period construction parameters are always open range [begin, end)
+      if (m_range_option == AS_CLOSED_RANGE) {
+        consume_delim(sitr, stream_end, delimiters[CLOSED_END]);// end delim
+        // add 1 duration unit to p2 to make range open
+        p2 += dur_unit;
+      }
+      else {
+        consume_delim(sitr, stream_end, delimiters[OPEN_END]);  // end delim
+      }
+
+      return period_type(p1, p2);
+    }
+
+  private:
+    collection_type delimiters; 
+    period_range_option m_range_option;
+
+    enum delim_ids { SEPARATOR, START, OPEN_END, CLOSED_END };
+
+    //! throws ios_base::failure if delimiter and parsed data do not match
+    void consume_delim(stream_itr_type& sitr,
+                       stream_itr_type& stream_end,
+                       const string_type& delim) const
+    {
+      /* string_parse_tree will not parse a string of punctuation characters 
+       * without knowing exactly how many characters to process
+       * Ex [2000. Will not parse out the '[' string without knowing 
+       * to process only one character. By using length of the delimiter 
+       * string we can safely iterate past it. */
+      string_type s;
+      for(unsigned int i = 0; i < delim.length() && sitr != stream_end; ++i) {
+        s += *sitr;
+        ++sitr;
+      }
+      if(s != delim) {
+        boost::throw_exception(std::ios_base::failure("Parse failed. Expected '"
+          + convert_string_type<char_type,char>(delim) + "' but found '" + convert_string_type<char_type,char>(s) + "'"));
+      }
+    }
+  };
+
+  template <class date_type, class char_type>  
+  const typename period_parser<date_type, char_type>::char_type 
+  period_parser<date_type, char_type>::default_period_separator[2] = {'/'};
+
+  template <class date_type, class char_type>  
+  const typename period_parser<date_type, char_type>::char_type 
+  period_parser<date_type, char_type>::default_period_start_delimeter[2] = {'['};
+
+  template <class date_type, class char_type>  
+  const typename period_parser<date_type, char_type>::char_type 
+  period_parser<date_type, char_type>::default_period_open_range_end_delimeter[2] = {')'};
+
+  template <class date_type, class char_type>  
+  const typename period_parser<date_type, char_type>::char_type 
+  period_parser<date_type, char_type>::default_period_closed_range_end_delimeter[2] = {']'};
+
+ } } //namespace boost::date_time
+
+#endif // DATETIME_PERIOD_PARSER_HPP___