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#
# is_integer.rb
#
module Puppet::Parser::Functions
newfunction(:is_integer, :type => :rvalue, :doc => <<-EOS
Returns true if the variable passed to this function is an Integer or
a decimal (base 10) integer in String form. The string may
start with a '-' (minus). A value of '0' is allowed, but a leading '0' digit may not
be followed by other digits as this indicates that the value is octal (base 8).
If given any other argument `false` is returned.
EOS
) do |arguments|
if (arguments.size != 1) then
raise(Puppet::ParseError, "is_integer(): 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 numbers prefixed with multiple
# 0's
#
# TODO these parameter should be a constant but I'm not sure
# if there is no risk to declare it inside of the module
# Puppet::Parser::Functions
# Integer numbers like
# -1234568981273
# 47291
numeric = %r{^-?(?:(?:[1-9]\d*)|0)$}
if value.is_a? Integer or (value.is_a? String and value.match numeric)
return true
else
return false
end
end
end
# vim: set ts=2 sw=2 et :
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