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# $Header: /var/local/cvsroot/4Suite/Ft/Xml/XPath/MathFunctions.py,v 1.6 2005/02/09 11:10:54 mbrown Exp $
"""
4XPath-specific math extension functions
Copyright 2005 Fourthought, Inc. (USA).
Detailed license and copyright information: http://4suite.org/COPYRIGHT
Project home, documentation, distributions: http://4suite.org/
"""
import math
from Ft.Xml.XPath import Conversions, FT_EXT_NAMESPACE
def Sin(context, x):
"math.sin"
return math.sin(Conversions.NumberValue(x))
def Cos(context, x):
"math.cos"
return math.cos(Conversions.NumberValue(x))
def DegreesToRads(context, x):
"Convert degrees to radians"
return Conversions.NumberValue(x)/180*math.pi
def Fact(context, x):
"Factorial"
x = Conversions.NumberValue(x)
if x > 1:
return reduce(lambda x,y: x*y, xrange(1,x+1), 1)
return 1
ExtNamespaces = {
FT_EXT_NAMESPACE : 'f',
}
ExtFunctions = {
(FT_EXT_NAMESPACE, 'cos'): Cos,
(FT_EXT_NAMESPACE, 'sin'): Sin,
(FT_EXT_NAMESPACE, 'degrees-to-rads'): DegreesToRads,
(FT_EXT_NAMESPACE, 'fact'): Fact,
}
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