Created
August 21, 2015 20:07
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Have ruby print its own Exception class tree
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#!/usr/bin/env ruby | |
# copied from http://blog.nicksieger.com/articles/2006/09/06/rubys-exception-hierarchy | |
# still relevant after all this time. | |
exceptions = [] | |
tree = {} | |
ObjectSpace.each_object(Class) do |cls| | |
next unless cls.ancestors.include? Exception | |
next if exceptions.include? cls | |
next if cls.superclass == SystemCallError # avoid dumping Errno's | |
exceptions << cls | |
cls.ancestors.delete_if {|e| [Object, Kernel].include? e }.reverse.inject(tree) {|memo,cls| memo[cls] ||= {}} | |
end | |
indent = 0 | |
tree_printer = Proc.new do |t| | |
t.keys.sort { |c1,c2| c1.name <=> c2.name }.each do |k| | |
space = (' ' * indent); space ||= '' | |
puts space + k.to_s | |
indent += 2; tree_printer.call t[k]; indent -= 2 | |
end | |
end | |
tree_printer.call tree |
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