diff options
Diffstat (limited to 'code/environments/production/modules/stdlib/lib/puppet/parser/functions/merge.rb')
-rw-r--r-- | code/environments/production/modules/stdlib/lib/puppet/parser/functions/merge.rb | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/code/environments/production/modules/stdlib/lib/puppet/parser/functions/merge.rb b/code/environments/production/modules/stdlib/lib/puppet/parser/functions/merge.rb new file mode 100644 index 0000000..25ebc79 --- /dev/null +++ b/code/environments/production/modules/stdlib/lib/puppet/parser/functions/merge.rb @@ -0,0 +1,37 @@ +# +# merge.rb +# +module Puppet::Parser::Functions + newfunction(:merge, :type => :rvalue, :doc => <<-'DOC') do |args| + Merges two or more hashes together and returns the resulting hash. + + For example: + + $hash1 = {'one' => 1, 'two', => 2} + $hash2 = {'two' => 'dos', 'three', => 'tres'} + $merged_hash = merge($hash1, $hash2) + # The resulting hash is equivalent to: + # $merged_hash = {'one' => 1, 'two' => 'dos', 'three' => 'tres'} + + When there is a duplicate key, the key in the rightmost hash will "win." + + DOC + + if args.length < 2 + raise Puppet::ParseError, "merge(): wrong number of arguments (#{args.length}; must be at least 2)" + end + + # The hash we accumulate into + accumulator = {} + # Merge into the accumulator hash + args.each do |arg| + next if arg.is_a?(String) && arg.empty? # empty string is synonym for puppet's undef + unless arg.is_a?(Hash) + raise Puppet::ParseError, "merge: unexpected argument type #{arg.class}, only expects hash arguments" + end + accumulator.merge!(arg) + end + # Return the fully merged hash + accumulator + end +end |