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-rw-r--r--lib/puppet/parser/functions/str2bool.rb46
1 files changed, 46 insertions, 0 deletions
diff --git a/lib/puppet/parser/functions/str2bool.rb b/lib/puppet/parser/functions/str2bool.rb
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+++ b/lib/puppet/parser/functions/str2bool.rb
@@ -0,0 +1,46 @@
+#
+# str2bool.rb
+#
+
+module Puppet::Parser::Functions
+ newfunction(:str2bool, :type => :rvalue, :doc => <<-EOS
+This converts a string to a boolean. This attempt to convert strings that
+contain things like: y, 1, t, true to 'true' and strings that contain things
+like: 0, f, n, false, no to 'false'.
+ EOS
+ ) do |arguments|
+
+ raise(Puppet::ParseError, "str2bool(): Wrong number of arguments " +
+ "given (#{arguments.size} for 1)") if arguments.size < 1
+
+ string = arguments[0]
+
+ # If string is already Boolean, return it
+ if !!string == string
+ return string
+ end
+
+ unless string.is_a?(String)
+ raise(Puppet::ParseError, 'str2bool(): Requires either ' +
+ 'string to work with')
+ end
+
+ # We consider all the yes, no, y, n and so on too ...
+ result = case string
+ #
+ # This is how undef looks like in Puppet ...
+ # We yield false 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, 'str2bool(): Unknown type of boolean given')
+ end
+
+ return result
+ end
+end
+
+# vim: set ts=2 sw=2 et :