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# frozen_string_literal: true
#
# merge.rb
#
module Puppet::Parser::Functions
newfunction(:merge, type: :rvalue, doc: <<-DOC) do |args|
@summary
Merges two or more hashes together and returns the resulting hash.
@example **Usage**
$hash1 = {'one' => 1, 'two', => 2}
$hash2 = {'two' => 'dos', 'three', => 'tres'}
$merged_hash = merge($hash1, $hash2) # $merged_hash = {'one' => 1, 'two' => 'dos', 'three' => 'tres'}
When there is a duplicate key, the key in the rightmost hash will "win."
@return [Hash]
The merged hash
Note that since Puppet 4.0.0 the same merge can be achieved with the + operator.
`$merged_hash = $hash1 + $hash2`
DOC
raise Puppet::ParseError, "merge(): wrong number of arguments (#{args.length}; must be at least 2)" if args.length < 2
# 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
raise Puppet::ParseError, "merge: unexpected argument type #{arg.class}, only expects hash arguments" unless arg.is_a?(Hash)
accumulator.merge!(arg)
end
# Return the fully merged hash
accumulator
end
end
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