From 3a7693d5c89981e1230d0d49163fc23d02224873 Mon Sep 17 00:00:00 2001
From: daurnimator <quae@daurnimator.com>
Date: Tue, 23 Jul 2013 18:51:47 -0400
Subject: [PATCH] src/timetable: Move normalise to be a method on timetable
 object

---
 spec/timetable_spec.lua | 40 ++++++++++++++++++++--------------------
 src/timetable.lua       | 33 +++++++++++++++++++++------------
 2 files changed, 41 insertions(+), 32 deletions(-)

diff --git a/spec/timetable_spec.lua b/spec/timetable_spec.lua
index 6536459..a72a0f9 100644
--- a/spec/timetable_spec.lua
+++ b/spec/timetable_spec.lua
@@ -12,26 +12,26 @@ describe ( "Time table library" , function ( )
 	end )
 
 	it ( "Get day of week correct" , function ( )
-		local function native_normalise ( tbl )
-			return os.date("*t",os.time(tbl))
+		local function native_normalise ( year , month , day )
+			return os.date("*t",os.time{
+				year = year ;
+				month = month ;
+				day = day ;
+			})
 		end
-		local tbl = {
-			year = 2013 ;
-			month = 7 ;
-			day = 23 ;
-		}
-		assert.are.same ( native_normalise ( tbl ).wday  , timetable.normalise ( tbl ).wday )
-		tbl.day=24
-		assert.are.same ( native_normalise ( tbl ).wday  , timetable.normalise ( tbl ).wday )
-		tbl.day=25
-		assert.are.same ( native_normalise ( tbl ).wday  , timetable.normalise ( tbl ).wday )
-		tbl.day=26
-		assert.are.same ( native_normalise ( tbl ).wday  , timetable.normalise ( tbl ).wday )
-		tbl.day=27
-		assert.are.same ( native_normalise ( tbl ).wday  , timetable.normalise ( tbl ).wday )
-		tbl.day=28
-		assert.are.same ( native_normalise ( tbl ).wday  , timetable.normalise ( tbl ).wday )
-		tbl.day=29
-		assert.are.same ( native_normalise ( tbl ).wday  , timetable.normalise ( tbl ).wday )
+		local function assert_same_wday ( year , month , day )
+			return assert.are.same (
+				native_normalise ( year , month , day ).wday ,
+				timetable.new ( year , month , day ):normalise().wday
+			)
+		end
+
+		assert_same_wday ( 2013 , 7 , 23 )
+		assert_same_wday ( 2013 , 7 , 24 )
+		assert_same_wday ( 2013 , 7 , 25 )
+		assert_same_wday ( 2013 , 7 , 26 )
+		assert_same_wday ( 2013 , 7 , 27 )
+		assert_same_wday ( 2013 , 7 , 28 )
+		assert_same_wday ( 2013 , 7 , 29 )
 	end )
 end )
diff --git a/src/timetable.lua b/src/timetable.lua
index df78b15..7e986a1 100644
--- a/src/timetable.lua
+++ b/src/timetable.lua
@@ -72,9 +72,8 @@ local function unpack_tm ( tm )
 		tm.sec  or 0
 end
 
-local function normalise ( tm )
-	local year , month , day , hour , min , sec = unpack_tm ( tm )
-
+-- Modify parameters so they all fit within the "normal" range
+local function normalise ( year , month , day , hour , min , sec )
 	min  , sec  = increment ( min  , sec  , 60 ) -- TODO: consider leap seconds?
 	hour , min  = increment ( hour , min  , 60 )
 	day  , hour = increment ( day  , hour , 24 )
@@ -96,22 +95,32 @@ local function normalise ( tm )
 	year , month = increment ( year , month - 1 , 12 )
 	month = month + 1
 
-	tm.sec   = sec
-	tm.min   = min
-	tm.hour  = hour
-	tm.day   = day
-	tm.month = month
-	tm.year  = year
+	return year , month , day , hour , min , sec
+end
+
+
+local timetable_methods = { }
+
+function timetable_methods:normalise ( )
+	local year , month , day
+	year , month , day , self.hour , self.min , self.sec = normalise ( unpack_tm ( self ) )
+
+	self.day   = day
+	self.month = month
+	self.year  = year
 
 	local yday = day_of_year ( day , month , year )
 	local wday = day_of_week ( yday , year )
 
-	tm.yday = yday
-	tm.wday = wday
+	self.yday = yday
+	self.wday = wday
 
-	return tm
+	return self
 end
+timetable_methods.normalize = timetable_methods.normalise -- American English
+
 local timetable_mt = {
+	__index    = timetable_methods ;
 }
 
 local function cast_timetable ( tm )
-- 
2.39.5