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module Pry::Command::Ls::JRubyHacks
private
# JRuby creates lots of aliases for methods imported from java in an attempt
# to make life easier for ruby programmers. (e.g. getFooBar becomes
# get_foo_bar and foo_bar, and maybe foo_bar? if it returns a Boolean). The
# full transformations are in the assignAliases method of:
# https://github.com/jruby/jruby/blob/master/src/org/jruby/javasupport/JavaClass.java
#
# This has the unfortunate side-effect of making the output of ls even more
# incredibly verbose than it normally would be for these objects; and so we
# filter out all but the nicest of these aliases here.
#
# TODO: This is a little bit vague, better heuristics could be used.
# JRuby also has a lot of scala-specific logic, which we don't copy.
def trim_jruby_aliases(methods)
grouped = methods.group_by do |m|
m.name.sub(/\A(is|get|set)(?=[A-Z_])/, '').gsub(/[_?=]/, '').downcase
end
grouped.flat_map do |_key, values|
values = values.sort_by do |m|
rubbishness(m.name)
end
found = []
values.select do |x|
(!found.any? { |y| x == y }) && found << x
end
end
end
# When removing jruby aliases, we want to keep the alias that is
# "least rubbish" according to this metric.
def rubbishness(name)
name.each_char.map { |x|
case x
when /[A-Z]/
1
when '?', '=', '!'
-2
else
0
end
}.inject(&:+) + (name.size / 100.0)
end
end
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