added support for float numbers

git-svn-id: http://galileo.dmi.unict.it/svn/relational/trunk@34 014f5005-505e-4b48-8d0a-63407b615a7c

CHANGELOG

@@ -23,4 +23,7 @@
 - Added support for parenthesis in relational queries
 
 0.4
-- Created GUI
+- Created GUI
+
+0.5
+- Added support for float numbers

relation.py

@@ -16,6 +16,8 @@
 # 
 # author Salvo "LtWorf" Tomaselli <tiposchi@tiscali.it>
 
+import rtypes
+
 class relation (object):
 	'''This objects defines a relation (as a group of consistent tuples) and operations
 	A relation can be represented using a table
@@ -76,6 +78,8 @@ class relation (object):
 			for j in range(len(self.header.attributes)):
 				if i[j].isdigit():
 					attributes[self.header.attributes[j]]=int(i[j])
+				elif rtypes.rstring(i[j]).isFloat():
+					attributes[self.header.attributes[j]]=float(i[j])
 				else:
 					attributes[self.header.attributes[j]]=i[j]
 				
@@ -411,6 +415,7 @@ class header (object):
 					res.append(j)
 		return res
 		
+
 if __name__=="__main__":
 	a=["id","nome","cognome"]
 	

relational.py

@@ -24,7 +24,7 @@ import parser
 import relation
 import maingui
 
-version="0.4"
+version="0.5"
 
 if __name__ == "__main__":
 	app = QtGui.QApplication(sys.argv)

rtypes.py

@@ -0,0 +1,28 @@
+# Relational
+# Copyright (C) 2008  Salvo "LtWorf" Tomaselli
+# 
+# Relation is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+# 
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+# 
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+# 
+# author Salvo "LtWorf" Tomaselli <tiposchi@tiscali.it>
+
+'''Custom types for relational algebra'''
+class rstring (str):
+	'''String subclass with some custom methods'''
+	def isFloat(self):
+		'''True if the string is a float number, false otherwise'''
+		lst=['0','1','2','3','4','5','6','7','8','9','.']
+		for i in self:
+			if i not in lst:
+				return False;
+		return True;

samples/people.tlb

@@ -1,9 +1,9 @@
 id name chief age
-0 jack 0 22
+0 jack 0 22.1
 1 carl 0 20
 2 john 1 30
 3 dean 1 33
 4 eve 0 25
 5 duncan 4 30
 6 paul 4 30
-7 alia 1 28
+7 alia 1 28