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-rw-r--r--lib/puppet/parser/functions/num2bool.rb40
1 files changed, 40 insertions, 0 deletions
diff --git a/lib/puppet/parser/functions/num2bool.rb b/lib/puppet/parser/functions/num2bool.rb
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+++ b/lib/puppet/parser/functions/num2bool.rb
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+#
+# num2bool.rb
+#
+
+# TODO(Krzysztof Wilczynski): We probably need to approach numeric values differently ...
+
+module Puppet::Parser::Functions
+ newfunction(:num2bool, :type => :rvalue, :doc => <<-EOS
+This function converts a number into a true boolean. Zero becomes false. Numbers
+higher then 0 become true.
+ EOS
+ ) do |arguments|
+
+ raise(Puppet::ParseError, "num2bool(): Wrong number of arguments " +
+ "given (#{arguments.size} for 1)") if arguments.size < 1
+
+ number = arguments[0]
+
+ # Only numbers allowed ...
+ unless number.match(/^\-?\d+$/)
+ raise(Puppet::ParseError, 'num2bool(): Requires integer to work with')
+ end
+
+ result = case number
+ when /^0$/
+ false
+ when /^\-?\d+$/
+ # Numbers in Puppet are often string-encoded which is troublesome ...
+ number = number.to_i
+ # We yield true for any positive number and false otherwise ...
+ number > 0 ? true : false
+ else
+ raise(Puppet::ParseError, 'num2bool(): Unknown numeric format given')
+ end
+
+ return result
+ end
+end
+
+# vim: set ts=2 sw=2 et :