module Pry::Command::Ls::JRubyHacks

Private Instance Methods

rubbishness(name) click to toggle source

When removing jruby aliases, we want to keep the alias that is “least rubbish” according to this metric.

# File lib/pry/commands/ls/jruby_hacks.rb, line 40
def rubbishness(name)
  name.each_char.map do |x|
    case x
    when /[A-Z]/
      1
    when '?', '=', '!'
      -2
    else
      0
    end
  end.inject(&:+) + (name.size / 100.0)
end
trim_jruby_aliases(methods) click to toggle source

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: 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.
# File lib/pry/commands/ls/jruby_hacks.rb, line 21
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.none? { |y| x == y }) && found << x
    end
  end
end