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