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-rw-r--r--lib/puppet/parser/functions/range.rb71
1 files changed, 71 insertions, 0 deletions
diff --git a/lib/puppet/parser/functions/range.rb b/lib/puppet/parser/functions/range.rb
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+++ b/lib/puppet/parser/functions/range.rb
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+#
+# range.rb
+#
+
+# TODO(Krzysztof Wilczynski): We probably need to approach numeric values differently ...
+
+module Puppet::Parser::Functions
+ newfunction(:range, :type => :rvalue, :doc => <<-EOS
+When given range in the form of (start, stop) it will extrapolate a range as
+an array.
+
+*Examples:*
+
+ range("0", "9")
+
+Will return: [0,1,2,3,4,5,6,7,8,9]
+
+ range("a", "c")
+
+Will return: ["a","b","c"]
+ EOS
+ ) do |arguments|
+
+ # We support more than one argument but at least one is mandatory ...
+ 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 integer 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 :