OpenCascade is subclass of OpenHash. It differs in a few significant ways. The reason this class is called “cascade” is that every internal Hash is transformed into an OpenCascade dynamically upon access. This makes it easy to create “cascading” references.
h = { :x => { :y => { :z => 1 } } } c = OpenCascade[h] c.x.y.z #=> 1
As soon as you access a node it automatically becomes an OpenCascade.
c = OpenCascade.new #=> #<OpenCascade:0x7fac3680ccf0 {}> c.r #=> #<OpenCascade:0x7fac368084c0 {}> c.a.b #=> #<OpenCascade:0x7fac3680a4f0 {}>
But if you set a node, then that will be that value.
c.a.b = 4 #=> 4
To query a node without causing the auto-creation of an OpenCasade instance, use the `?`-mark.
c.a.z? #=> nil
OpenCascade also transforms Hashes within Arrays.
h = { :x=>[ {:a=>1}, {:a=>2} ], :y=>1 } c = OpenCascade[h] c.x.first.a.assert == 1 c.x.last.a.assert == 2
Finally, you can set call a private method via bang methods using the `!`-mark.
c = OpenCascade.new #=> #<OpenCascade:0x7fac3680ccf0 {}> c.each = 4 c.each! do |k,v| ... end c.x!(4).y!(3) #=> #<OpenCascade:0x7fac3680ccf0 {:x=>4, :y=>3}>
Initialize new OpenCascade instance.
default - The usual default object.
# File lib/hashery/open_cascade.rb, line 60 def initialize(*default) @read = {} leet = lambda { |h,k| h[k] = OpenCascade.new(&leet) } super(*default, &leet) end
# File lib/hashery/open_cascade.rb, line 90 def method_missing(sym, *args, &blk) type = sym.to_s[-1,1] name = sym.to_s.gsub(/[=!?]$/, '').to_sym case type when '=' store(name, args.first) when '?' key?(name) ? read!(name) : nil # key?(name) when '!' __send__(name, *args, &blk) else #if key?(name) read(name) #else # #default = OpenCascade.new #self.class.new # #default = default_proc ? default_proc.call(self, name) : default # store(name, read(name)) #end end end
Read value given a key
.
key - Index key to lookup.
Returns value.
# File lib/hashery/open_cascade.rb, line 79 def read(key) if @read[cast_key(key)] super(key) else @read[cast_key(key)] = store(key, cast_value(super(key))) end end
Cast value, such that Hashes are converted to OpenCascades. And Hashes in Arrays are converted to OpenCascades as well.
# File lib/hashery/open_cascade.rb, line 124 def cast_value(entry) case entry when Hash e = OpenCascade.new e.key_proc = key_proc if key_proc e.merge!(entry) e when Array entry.map{ |e| cast_value(e) } else entry end end