Created
September 4, 2020 20:37
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Group methods together that are called together
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#!/usr/bin/env ruby | |
# frozen_string_literal: true | |
# | |
# Output a grouping of methods (within a file) such that for each group G, and any method m ∈ G: | |
# - ∃ x ∈ G such that x calls m, or | |
# - no other method in all groups calls m | |
# | |
# The output is a kind of "function cohesion", where you can find groups of methods that are related. | |
# This is useful when trying to find what you need to extract from a file. | |
# | |
require "set" | |
def walk(node, call_graph: {}, current_method: nil) | |
return call_graph unless node.is_a?(::RubyVM::AbstractSyntaxTree::Node) | |
called_method = nil | |
case node.type | |
when :DEFN | |
current_method = node.children[0] | |
when :CALL | |
called_method = node.children[1] | |
when :FCALL | |
called_method = node.children[0] | |
when :QCALL | |
called_method = node.children[1] | |
when :VCALL | |
called_method = node.children[0] | |
end | |
if called_method && current_method | |
call_graph[current_method] ||= Set.new | |
call_graph[current_method] << called_method | |
end | |
node.children.each do |child| | |
walk(child, call_graph: call_graph, current_method: current_method) | |
end | |
call_graph | |
end | |
call_graph = walk(::RubyVM::AbstractSyntaxTree.parse(ARGF.read)) | |
result = [] | |
call_graph.each do |method, called_methods| | |
called_methods = called_methods.filter { |m| call_graph.key?(m) } | |
existing = result.find { |methods| methods.include?(method) } | |
if existing | |
existing += called_methods | |
else | |
result << ([method] + called_methods) | |
end | |
end | |
pp result |
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