27c3b644b0
This commit replaces the example in the merge function with a much clearer one. It also mentions that the rightmost value wins in the event of duplicated hash keys.
33 lines
1 KiB
Ruby
33 lines
1 KiB
Ruby
module Puppet::Parser::Functions
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newfunction(:merge, :type => :rvalue, :doc => <<-'ENDHEREDOC') do |args|
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Merges two or more hashes together and returns the resulting hash.
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For example:
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$hash1 = {'one' => 1, 'two', => 2}
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$hash2 = {'two' => 'dos', 'three', => 'tres'}
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$merged_hash = merge($hash1, $hash2)
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# The resulting hash is equivalent to:
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# $merged_hash = {'one' => 1, 'two' => 'dos', 'three' => 'tres'}
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When there is a duplicate key, the key in the rightmost hash will "win."
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ENDHEREDOC
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if args.length < 2
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raise Puppet::ParseError, ("merge(): wrong number of arguments (#{args.length}; must be at least 2)")
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end
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# The hash we accumulate into
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accumulator = Hash.new
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# Merge into the accumulator hash
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args.each do |arg|
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unless arg.is_a?(Hash)
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raise Puppet::ParseError, "merge: unexpected argument type #{arg.class}, only expects hash arguments"
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end
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accumulator.merge!(arg)
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end
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# Return the fully merged hash
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accumulator
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end
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end
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