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Parse date time string with spirit

, 19 Mar 2008
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A sample show how to parse date with boost spirit framework

Introduction

This article include a sample show how to use boost spirit framework parse a date time string like "1999-01-20T00:01:22".

Background

The XML schema define the date time format like this "2000-01-30T00:10:20+1".

Using the code

First create your parser

struct myparser: public grammar<myparser>
{
  template <typename ScannerT>
  struct definition
  {
    definition(myparser const& self)
    {
      first = int_p[assign(self.date_.year_)] >> "-" >> int_p[assign(self.date_.month_)] 
      >> "-" >> int_p[assign(self.date_.day_)] >> "T" >> int_p[assign(self.date_.hour_)] 
      >> ":" >> int_p[assign(self.date_.minute_)] >> ":" >> int_p[assign(self.date_.second_)] ;
    }
    rule<ScannerT> first;
    rule<ScannerT> const&
    start() const { return first; }
  };
  myparser(date& d):date_(d){};
  date& date_;
};        

Then invoke the parser:

bool parse_date(char const* str, date& d)
{
  myparser p(d);
  return parse(str, p).full;
}      

Points of Interest

This parser can be improved to support more flexible format

History

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

ZhengPing Wang
Software Developer (Senior)
China China
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Comments and Discussions

 
QuestionOverkill? PinmemberPatLeCat20-Mar-08 3:05 
Is Spirit really well advised for such a small and static structure? A simple regex or even an STL find() would do the trick.
 
I must admit, that I haven't seen a really clever example which shows a Spirit based solution which is easier than other approaches.
AnswerRe: Overkill? PinmemberComaWhite8616-Nov-08 10:33 

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