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|
# frozen_string_literal: true
require "forwardable"
require_relative "../helpers/eval"
require_relative "../errors"
module Byebug
#
# Processes commands in regular mode.
#
# You can override this class to create your own command processor that, for
# example, whitelists only certain commands to be executed.
#
# @see PostMortemProcessor for a example
#
class CommandProcessor
include Helpers::EvalHelper
attr_accessor :prev_line
attr_reader :context, :interface
def initialize(context, interface = LocalInterface.new)
@context = context
@interface = interface
@proceed = false
@prev_line = nil
end
def printer
@printer ||= Printers::Plain.new
end
extend Forwardable
def_delegators :@context, :frame
def_delegator :printer, :print, :pr
def_delegator :printer, :print_collection, :prc
def_delegator :printer, :print_variables, :prv
def_delegators :interface, :errmsg, :puts, :confirm
def_delegators :Byebug, :commands
#
# Available commands
#
def command_list
@command_list ||= CommandList.new(commands)
end
def at_line
process_commands
end
def at_tracing
puts "Tracing: #{context.full_location}"
run_auto_cmds(2)
end
def at_breakpoint(brkpt)
number = Byebug.breakpoints.index(brkpt) + 1
puts "Stopped by breakpoint #{number} at #{frame.file}:#{frame.line}"
end
def at_catchpoint(exception)
puts "Catchpoint at #{context.location}: `#{exception}'"
end
def at_return(return_value)
puts "Return value is: #{safe_inspect(return_value)}"
process_commands
end
def at_end
process_commands
end
#
# Let the execution continue
#
def proceed!
@proceed = true
end
#
# Handle byebug commands.
#
def process_commands
before_repl
repl
ensure
after_repl
end
protected
#
# Prompt shown before reading a command.
#
def prompt
"(byebug) "
end
def before_repl
@proceed = false
@prev_line = nil
run_auto_cmds(1)
interface.autorestore
end
def after_repl
interface.autosave
end
#
# Main byebug's REPL
#
def repl
until @proceed
cmd = interface.read_command(prompt)
return if cmd.nil?
next if cmd == ""
run_cmd(cmd)
end
end
private
def auto_cmds_for(run_level)
command_list.select { |cmd| cmd.always_run >= run_level }
end
#
# Run permanent commands.
#
def run_auto_cmds(run_level)
safely do
auto_cmds_for(run_level).each { |cmd| cmd.new(self).execute }
end
end
#
# Executes the received input
#
# Instantiates a command matching the input and runs it. If a matching
# command is not found, it evaluates the unknown input.
#
def run_cmd(input)
safely do
command = command_list.match(input)
return command.new(self, input).execute if command
puts safe_inspect(multiple_thread_eval(input))
end
end
def safely
yield
rescue StandardError => e
errmsg(e.message)
end
end
end
|
