1 files changed, 46 insertions, 0 deletions
diff --git a/lib/puppet/parser/functions/str2bool.rb b/lib/puppet/parser/functions/str2bool.rb
new file mode 100644
index 00000000..446732ec
--- /dev/null
+++ 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 :