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Parse date time string with spirit

, 19 Mar 2008 CPOL 18.7K 100 7
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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
Programmer live in china.
Interesting with knowledge management.

My home page: http://herosys.net

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Comments and Discussions

 
QuestionOverkill? Pin
PatLeCat20-Mar-08 3:05
memberPatLeCat20-Mar-08 3:05 
AnswerRe: Overkill? Pin
ComaWhite8616-Nov-08 10:33
memberComaWhite8616-Nov-08 10:33 
does it really matter? its the point of it, to show how spirit can be done and how to use it. not whether it is overkill or not.

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