From 54d065f4a1f05b799bd7f36ed926e0ab504ea395 Mon Sep 17 00:00:00 2001
From: Edward Faulkner <ef@alum.mit.edu>
Date: Fri, 29 Apr 2011 10:39:00 -0400
Subject: [PATCH] Adding a parser for postgres time intervals

---
 lib/types.js                                  | 31 ++++++++++++++++++-
 test/unit/client/typed-query-results-tests.js | 21 +++++++++++++
 2 files changed, 51 insertions(+), 1 deletion(-)

diff --git a/lib/types.js b/lib/types.js
index 89bc5a01..a43608b6 100644
--- a/lib/types.js
+++ b/lib/types.js
@@ -18,6 +18,7 @@ var getStringTypeParser = function(oid) {
   return typeParsers[oid] || noParse;
 };
 
+
 //parses PostgreSQL server formatted date strings into javascript date objects
 var parseDate = function(isoDate) {
   //TODO this could do w/ a refactor
@@ -86,6 +87,33 @@ var parseStringArray = function(val) {
   });
 };
 
+
+var NUM = '([+-]?\\d+)';
+var YEAR = NUM + '\\s+years?';
+var MON = NUM + '\\s+mons?';
+var DAY = NUM + '\\s+days?';
+var TIME = '([+-])?(\\d\\d):(\\d\\d):(\\d\\d)';
+var INTERVAL = [YEAR,MON,DAY,TIME].map(function(p){ return "("+p+")?" }).join('\\s*');
+
+
+var parseInterval = function(val) {
+  if (!val) return {};
+  var m = new RegExp(INTERVAL).exec(val);
+  var i = {};
+  if (m[2]) i.years = parseInt(m[2]);
+  if (m[4]) i.months = parseInt(m[4]);
+  if (m[6]) i.days = parseInt(m[6]);
+  if (m[9]) i.hours = parseInt(m[9]);
+  if (m[10]) i.minutes = parseInt(m[10]);
+  if (m[11]) i.seconds = parseInt(m[11]);
+  if (m[8] == '-'){
+      if (i.hours) i.hours *= -1;
+      if (i.minutes) i.minutes *= -1;
+      if (i.seconds) i.seconds *= -1;
+  }
+  return i;
+};
+
 //default string type parser registrations
 registerStringTypeParser(20, parseInt);
 registerStringTypeParser(21, parseInt);
@@ -99,8 +127,9 @@ registerStringTypeParser(1114, parseDate);
 registerStringTypeParser(1184, parseDate);
 registerStringTypeParser(1007, parseIntegerArray);
 registerStringTypeParser(1009, parseStringArray);
+registerStringTypeParser(1186, parseInterval);
 
 module.exports = {
   registerStringTypeParser: registerStringTypeParser,
-  getStringTypeParser: getStringTypeParser
+  getStringTypeParser: getStringTypeParser,
 }
diff --git a/test/unit/client/typed-query-results-tests.js b/test/unit/client/typed-query-results-tests.js
index 77b3beda..5b5632d9 100644
--- a/test/unit/client/typed-query-results-tests.js
+++ b/test/unit/client/typed-query-results-tests.js
@@ -98,6 +98,27 @@ test('typed results', function() {
     expected: function(val) {
       assert.UTCDate(val, 2010, 9, 31, 0, 0, 0, 0);
     }
+  },{
+    name: 'interval time',
+    dataTypeID: 1186,
+    actual: '01:02:03',
+    expected: function(val) {
+      assert.deepEqual(val, {'hours':1, 'minutes':2, 'seconds':3})
+    }
+  },{
+    name: 'interval long',
+    dataTypeID: 1186,
+    actual: '1 year -32 days',
+    expected: function(val) {
+      assert.deepEqual(val, {'years':1, 'days':-32})
+    }
+  },{
+    name: 'interval combined negative',
+    dataTypeID: 1186,
+    actual: '1 day -00:00:03',
+    expected: function(val) {
+      assert.deepEqual(val, {'days':1, 'hours': 0, 'minutes': 0, 'seconds':-3})
+    }
   }];