class Hash
From : www.geekmade.co.uk/2008/09/ruby-tip-normalizing-hash-keys-as-symbols/
Public Instance Methods
each_except( e ) { |k, v| ... }
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x = {
:none => String, :png => "file.png", :svg => "file.svg"
}
x.each_except( :key => [:none], :value => [/.png$/] ) do |k, v|
puts "#{k} -> #{v}"
end
> svg -> file.svg¶ ↑
# File lib/graphviz/core_ext.rb, line 46 def each_except( e, &b ) key_table = (e[:key]||[]).clone.delete_if {|i| i.kind_of? Regexp } key_regexp = (e[:key]||[]).clone.delete_if {|i| key_table.include? i }.map {|i| i.to_s }.join("|") value_table = (e[:value]||[]).clone.delete_if {|i| i.kind_of? Regexp } value_regexp = (e[:value]||[]).clone.delete_if {|i| value_table.include? i }.map {|i| i.to_s }.join("|") self.each do |k, v| yield( k, v ) unless (key_table.size > 0 and key_table.include?(k)) or (key_regexp.size > 0 and k.to_s.match(key_regexp)) or (value_table.size > 0 and value_table.include?(v)) or (value_regexp.size > 0 and v.to_s.match(value_regexp)) end end
symbolize_keys()
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# File lib/graphviz/core_ext.rb, line 28 def symbolize_keys inject({}) do |options, (key, value)| options[(key.to_sym rescue key) || key] = value options end end