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|
#
# is_numeric.rb
#
module Puppet::Parser::Functions
newfunction(:is_numeric, :type => :rvalue, :doc => <<-EOS
Returns true if the variable passed to this function is a number.
The function recognizes only integer and float but not hex or octal
numbers (for now) until a decision is made how to handle these types.
The parameter can be in the native format or given as string representation
of a number.
Valid examples:
77435
10e-12
-8475
0.2343
-23.561e3
EOS
) do |arguments|
if (arguments.size != 1) then
raise(Puppet::ParseError, "is_numeric(): Wrong number of arguments "+
"given #{arguments.size} for 1")
end
value = arguments[0]
# Regex is taken from the lexer of puppet
# puppet/pops/parser/lexer.rb but modified to match also
# negative values and disallow invalid octal numbers or
# numbers prefixed with multiple 0's (except in hex numbers)
#
# TODO these parameters should be constants but I'm not sure
# if there is no risk to declare them inside of the module
# Puppet::Parser::Functions
# TODO decide if this should be used
# HEX numbers like
# 0xaa230F
# 0X1234009C
# 0x0012
# -12FcD
#numeric_hex = %r{^-?0[xX][0-9A-Fa-f]+$}
# TODO decide if this should be used
# OCTAL numbers like
# 01234567
# -045372
#numeric_oct = %r{^-?0[1-7][0-7]*$}
# Integer/Float numbers like
# -0.1234568981273
# 47291
# 42.12345e-12
numeric = %r{^-?(?:(?:[1-9]\d*)|0)(?:\.\d+)?(?:[eE]-?\d+)?$}
if value.is_a? Numeric or (value.is_a? String and (
value.match(numeric) #or
# value.match(numeric_hex) or
# value.match(numeric_oct)
))
return true
else
return false
end
end
end
# vim: set ts=2 sw=2 et :
|
