index.rb

ODBA - index.rb

    def proc_resolve_search_term # :nodoc:
      if(@proc_resolve_search_term.nil?)
        src = <<-EOS
          Proc.new { |origin| 
            values = {}
        EOS
        @resolve_search_term.each { |name, info|
          src << <<-EOS
            begin
              values.store('#{name}', origin.#{info['resolve']})
            rescue NameError
            end
          EOS
        }
        src << <<-EOS 
            values
          }
        EOS
        @proc_resolve_search_term = eval(src)
      end
      @proc_resolve_search_term
    end

EOS is Ruby heredocument.

Sample for a nested Hash:
hash = {'name' => {'resolve' => 'value'}}

hash.each do |key, value|
p value['resolve']
end

Strings can continue across multiple input lines, in which case they will contain newline characters. It is also possible to use here documents to express long string literals. Whenever Ruby parses the sequence <<identifier or <<quoted string, it replaces it with a string literal built from successive logical input lines. It stops building the string when it finds a line that starts with the identifier or the quoted string. You can put a minus sign immediately after the << characters, in which case the terminator can be indented from the left margin. If a quoted string was used to specify the terminator, its quoting rules will be applied to the here document; otherwise, double-quoting rules apply.