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# frozen_string_literal: true
require_relative "nop"
require_relative "../color"
require_relative "../ruby-lex"
# :stopdoc:
module IRB
module ExtendCommand
class ShowSource < Nop
def execute(str = nil)
unless str.is_a?(String)
puts "Error: Expected a string but got #{str.inspect}"
return
end
source = find_source(str)
if source && File.exist?(source.file)
show_source(source)
else
puts "Error: Couldn't locate a definition for #{str}"
end
nil
end
private
# @param [IRB::ExtendCommand::ShowSource::Source] source
def show_source(source)
puts
puts "#{bold("From")}: #{source.file}:#{source.first_line}"
puts
code = IRB::Color.colorize_code(File.read(source.file))
puts code.lines[(source.first_line - 1)...source.last_line].join
puts
end
def find_source(str)
case str
when /\A[A-Z]\w*(::[A-Z]\w*)*\z/ # Const::Name
eval(str, irb_context.workspace.binding) # trigger autoload
base = irb_context.workspace.binding.receiver.yield_self { |r| r.is_a?(Module) ? r : Object }
file, line = base.const_source_location(str) if base.respond_to?(:const_source_location) # Ruby 2.7+
when /\A(?<owner>[A-Z]\w*(::[A-Z]\w*)*)#(?<method>[^ :.]+)\z/ # Class#method
owner = eval(Regexp.last_match[:owner], irb_context.workspace.binding)
method = Regexp.last_match[:method]
if owner.respond_to?(:instance_method) && owner.instance_methods.include?(method.to_sym)
file, line = owner.instance_method(method).source_location
end
when /\A((?<receiver>.+)(\.|::))?(?<method>[^ :.]+)\z/ # method, receiver.method, receiver::method
receiver = eval(Regexp.last_match[:receiver] || 'self', irb_context.workspace.binding)
method = Regexp.last_match[:method]
file, line = receiver.method(method).source_location if receiver.respond_to?(method)
end
if file && line
Source.new(file: file, first_line: line, last_line: find_end(file, line))
end
end
def find_end(file, first_line)
return first_line unless File.exist?(file)
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.process_continue(prev_tokens)
code_block_open = lex.check_code_block(code, prev_tokens)
if !continue && !code_block_open
return first_line + lnum
end
end
first_line
end
def bold(str)
Color.colorize(str, [:BOLD])
end
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
end
end
end
# :startdoc:
|
