First version. Simple range function to use within Puppet DSL.

Signed-off-by: Krzysztof Wilczynski <krzysztof.wilczynski@linux.com>

1 files changed, 56 insertions, 0 deletions

diff --git a/range.rb b/range.rb
new file mode 100644
index 0000000..0c513ef
--- /dev/null
+++ b/range.rb
@@ -0,0 +1,56 @@
+#
+# range.rb
+#
+
+module Puppet::Parser::Functions
+  newfunction(:range, :type => :rvalue, :doc => <<-EOS
+    EOS
+  ) do |arguments|
+
+    raise(Puppet::ParseError, "range(): Wrong number of " +
+      "arguments given (#{arguments.size} for 1)") if arguments.size < 1
+
+    if arguments.size > 1
+      start = arguments[0]
+      stop  = arguments[1]
+
+      type = '..' # We select simplest type for Range available in Ruby ...
+
+    elsif arguments.size > 0
+      value = arguments[0]
+
+      if m = value.match(/^(\w+)(\.\.\.?|\-)(\w+)$/)
+        start = m[1]
+        stop  = m[3]
+
+        type = m[2]
+
+      elsif value.match(/^.+$/)
+        raise(Puppet::ParseError, 'range(): Unable to compute range ' +
+          'from the value given')
+      else
+        raise(Puppet::ParseError, 'range(): Unknown format of range given')
+      end
+    end
+
+      # Check whether we have numeric value if so then make it so ...
+      if start.match(/^\d+$/)
+        start = start.to_i
+        stop  = stop.to_i
+      else
+        start = start.to_s
+        stop  = stop.to_s
+      end
+
+      range = case type
+        when /^(\.\.|\-)$/ then (start .. stop)
+        when /^(\.\.\.)$/  then (start ... stop) # Exclusive of last element ...
+      end
+
+      result = range.collect { |i| i } # Get them all ... Pokemon ...
+
+    return result
+  end
+end
+
+# vim: set ts=2 sw=2 et :