From: Mikko Rasa <tdb@tdb.fi>
Date: Sun, 24 Jul 2016 14:24:01 +0000 (+0300)
Subject: Add conversion from RFC3339 string to DateTime
X-Git-Url: http://git.tdb.fi/?p=libs%2Fcore.git;a=commitdiff_plain;h=d716073b5f2e2fcc518d53ec6ef09c5971b6d0e4

Add conversion from RFC3339 string to DateTime
---

diff --git a/source/time/datetime.cpp b/source/time/datetime.cpp
index c77796f..26bd7cd 100644
--- a/source/time/datetime.cpp
+++ b/source/time/datetime.cpp
@@ -1,6 +1,7 @@
 #include <cstdlib>
 #include <stdexcept>
 #include <msp/strings/format.h>
+#include <msp/strings/regex.h>
 #include "datetime.h"
 #include "timestamp.h"
 
@@ -104,6 +105,36 @@ void DateTime::init(int y, unsigned char m, unsigned char d, unsigned char h, un
 		throw out_of_range("DateTime::DateTime mday");
 }
 
+DateTime DateTime::parse_rfc3339(const string &str)
+{
+	static Regex re("^([0-9]{4})-([0-9]{2})-([0-9]{2})T([0-9]{2}):([0-9]{2}):([0-9]{2})(Z|[-+]([0-9]{2}):([0-9]{2}))$");
+
+	RegMatch m = re.match(str);
+	if(!m)
+		throw invalid_argument("DateTime::parse_rfc3339");
+
+	unsigned year = lexical_cast<unsigned>(m[1].str);
+	unsigned month = lexical_cast<unsigned>(m[2].str);
+	unsigned mday = lexical_cast<unsigned>(m[3].str);
+	unsigned hr = lexical_cast<unsigned>(m[4].str);
+	unsigned minute = lexical_cast<unsigned>(m[5].str);
+	unsigned second = lexical_cast<unsigned>(m[6].str);
+
+	DateTime result = DateTime(year, month, mday, hr, minute, second);
+
+	int tzoff = 0;
+	if(m[7].str!="Z")
+	{
+		tzoff = lexical_cast<unsigned>(m[8].str)*60+lexical_cast<unsigned>(m[9].str);
+		if(m[7].str[0]=='-')
+			tzoff = -tzoff;
+	}
+
+	result.set_timezone(tzoff);
+
+	return result;
+}
+
 void DateTime::add_days(int days)
 {
 	int new_year = year;
diff --git a/source/time/datetime.h b/source/time/datetime.h
index f065d32..b7f578c 100644
--- a/source/time/datetime.h
+++ b/source/time/datetime.h
@@ -43,6 +43,8 @@ private:
 	void init(int, unsigned char, unsigned char, unsigned char, unsigned char, unsigned char, unsigned);
 
 public:
+	static DateTime parse_rfc3339(const std::string &);
+
 	int get_year() const { return year; }
 	unsigned char get_month() const { return month; }
 	unsigned char get_mday() const { return mday; }
@@ -80,6 +82,9 @@ private:
 inline void operator<<(LexicalConverter &c, const DateTime &d)
 { c.result(d.format_rfc3339()); }
 
+inline void operator>>(const LexicalConverter &c, DateTime &d)
+{ d = DateTime::parse_rfc3339(c.get()); }
+
 } // namespace Time
 } // namespace Msp