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-rw-r--r--lib/puppet/parser/functions/bool2num.rb49
1 files changed, 49 insertions, 0 deletions
diff --git a/lib/puppet/parser/functions/bool2num.rb b/lib/puppet/parser/functions/bool2num.rb
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+++ b/lib/puppet/parser/functions/bool2num.rb
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+#
+# bool2num.rb
+#
+
+module Puppet::Parser::Functions
+ newfunction(:bool2num, :type => :rvalue, :doc => <<-EOS
+ Converts a boolean to a number. Converts the values:
+ false, f, 0, n, and no to 0
+ true, t, 1, y, and yes to 1
+ Requires a single boolean or string as an input.
+ EOS
+ ) do |arguments|
+
+ raise(Puppet::ParseError, "bool2num(): Wrong number of arguments " +
+ "given (#{arguments.size} for 1)") if arguments.size < 1
+
+ value = arguments[0]
+ klass = value.class
+
+ # We can have either true or false, or string which resembles boolean ...
+ unless [FalseClass, TrueClass, String].include?(klass)
+ raise(Puppet::ParseError, 'bool2num(): Requires either ' +
+ 'boolean or string to work with')
+ end
+
+ if value.is_a?(String)
+ # We consider all the yes, no, y, n and so on too ...
+ value = case value
+ #
+ # This is how undef looks like in Puppet ...
+ # We yield 0 (or false if you wish) in this case.
+ #
+ when /^$/, '' then false # Empty string will be false ...
+ when /^(1|t|y|true|yes)$/ then true
+ when /^(0|f|n|false|no)$/ then false
+ when /^(undef|undefined)$/ then false # This is not likely to happen ...
+ else
+ raise(Puppet::ParseError, 'bool2num(): Unknown type of boolean given')
+ end
+ end
+
+ # We have real boolean values as well ...
+ result = value ? 1 : 0
+
+ return result
+ end
+end
+
+# vim: set ts=2 sw=2 et :