Merge pull request #514 from DavidS/add-convert_base

Adds a convert_base function, which can convert numbers between bases

1 files changed, 35 insertions, 0 deletions

diff --git a/lib/puppet/parser/functions/convert_base.rb b/lib/puppet/parser/functions/convert_base.rb
new file mode 100644
index 0000000..0fcbafe
--- /dev/null
+++ b/lib/puppet/parser/functions/convert_base.rb
@@ -0,0 +1,35 @@
+module Puppet::Parser::Functions
+
+  newfunction(:convert_base, :type => :rvalue, :arity => 2, :doc => <<-'ENDHEREDOC') do |args|
+
+    Converts a given integer or base 10 string representing an integer to a specified base, as a string.
+
+    Usage:
+
+      $binary_repr = convert_base(5, 2)  # $binary_repr is now set to "101"
+      $hex_repr = convert_base("254", "16")  # $hex_repr is now set to "fe"
+
+    ENDHEREDOC
+
+    raise Puppet::ParseError, ("convert_base(): First argument must be either a string or an integer") unless (args[0].is_a?(Integer) or args[0].is_a?(String))
+    raise Puppet::ParseError, ("convert_base(): Second argument must be either a string or an integer") unless (args[1].is_a?(Integer) or args[1].is_a?(String))
+
+    if args[0].is_a?(String)
+      raise Puppet::ParseError, ("convert_base(): First argument must be an integer or a string corresponding to an integer in base 10") unless args[0] =~ /^[0-9]+$/
+    end
+
+    if args[1].is_a?(String)
+      raise Puppet::ParseError, ("convert_base(): First argument must be an integer or a string corresponding to an integer in base 10") unless args[1] =~ /^[0-9]+$/
+    end
+
+    number_to_convert = args[0]
+    new_base = args[1]
+
+    number_to_convert = number_to_convert.to_i()
+    new_base = new_base.to_i()
+
+    raise Puppet::ParseError, ("convert_base(): base must be at least 2 and must not be greater than 36") unless new_base >= 2 and new_base <= 36
+
+    return number_to_convert.to_s(new_base)
+  end
+end