зеркало из https://github.com/github/ruby.git
79 строки
2.7 KiB
Ruby
79 строки
2.7 KiB
Ruby
# frozen_string_literal: true
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require_relative "ruby-lex"
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module IRB
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class SourceFinder
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Source = Struct.new(
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:file, # @param [String] - file name
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:first_line, # @param [String] - first line
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:last_line, # @param [String] - last line
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keyword_init: true,
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)
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private_constant :Source
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def initialize(irb_context)
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@irb_context = irb_context
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end
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def find_source(signature, super_level = 0)
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context_binding = @irb_context.workspace.binding
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case signature
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when /\A[A-Z]\w*(::[A-Z]\w*)*\z/ # Const::Name
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eval(signature, context_binding) # trigger autoload
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base = context_binding.receiver.yield_self { |r| r.is_a?(Module) ? r : Object }
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file, line = base.const_source_location(signature)
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when /\A(?<owner>[A-Z]\w*(::[A-Z]\w*)*)#(?<method>[^ :.]+)\z/ # Class#method
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owner = eval(Regexp.last_match[:owner], context_binding)
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method = Regexp.last_match[:method]
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return unless owner.respond_to?(:instance_method)
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file, line = method_target(owner, super_level, method, "owner")
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when /\A((?<receiver>.+)(\.|::))?(?<method>[^ :.]+)\z/ # method, receiver.method, receiver::method
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receiver = eval(Regexp.last_match[:receiver] || 'self', context_binding)
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method = Regexp.last_match[:method]
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return unless receiver.respond_to?(method, true)
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file, line = method_target(receiver, super_level, method, "receiver")
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end
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if file && line && File.exist?(file)
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Source.new(file: file, first_line: line, last_line: find_end(file, line))
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end
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end
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private
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def find_end(file, first_line)
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lex = RubyLex.new
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lines = File.read(file).lines[(first_line - 1)..-1]
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tokens = RubyLex.ripper_lex_without_warning(lines.join)
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prev_tokens = []
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# chunk with line number
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tokens.chunk { |tok| tok.pos[0] }.each do |lnum, chunk|
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code = lines[0..lnum].join
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prev_tokens.concat chunk
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continue = lex.should_continue?(prev_tokens)
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syntax = lex.check_code_syntax(code, local_variables: [])
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if !continue && syntax == :valid
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return first_line + lnum
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end
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end
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first_line
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end
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def method_target(owner_receiver, super_level, method, type)
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case type
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when "owner"
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target_method = owner_receiver.instance_method(method)
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when "receiver"
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target_method = owner_receiver.method(method)
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end
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super_level.times do |s|
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target_method = target_method.super_method if target_method
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end
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target_method.nil? ? nil : target_method.source_location
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rescue NameError
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nil
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end
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end
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end
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