# frozen_string_literal: false
#
# irb/lib/tracer.rb -
# $Release Version: 0.9.6$
# $Revision$
# by Keiju ISHITSUKA(keiju@ruby-lang.org)
#
# --
#
#
#
begin
require "tracer"
rescue LoadError
$stderr.puts "Tracer extension of IRB is enabled but tracer gem doesn't found."
module IRB
TracerLoadError = true
class Context
def use_tracer=(opt)
# do nothing
end
end
end
return # This is about to disable loading below
end
module IRB
# initialize tracing function
def IRB.initialize_tracer
Tracer.verbose = false
Tracer.add_filter {
|event, file, line, id, binding, *rests|
/^#{Regexp.quote(@CONF[:IRB_LIB_PATH])}/ !~ file and
File::basename(file) != "irb.rb"
}
end
class Context
# Whether Tracer is used when evaluating statements in this context.
#
# See +lib/tracer.rb+ for more information.
attr_reader :use_tracer
alias use_tracer? use_tracer
# Sets whether or not to use the Tracer library when evaluating statements
# in this context.
#
# See +lib/tracer.rb+ for more information.
def use_tracer=(opt)
if opt
Tracer.set_get_line_procs(@irb_path) {
|line_no, *rests|
@io.line(line_no)
}
elsif !opt && @use_tracer
Tracer.off
end
@use_tracer=opt
end
end
class WorkSpace
alias __evaluate__ evaluate
# Evaluate the context of this workspace and use the Tracer library to
# output the exact lines of code are being executed in chronological order.
#
# See +lib/tracer.rb+ for more information.
def evaluate(context, statements, file = nil, line = nil)
if context.use_tracer? && file != nil && line != nil
Tracer.on
begin
__evaluate__(context, statements, file, line)
ensure
Tracer.off
end
else
__evaluate__(context, statements, file || __FILE__, line || __LINE__)
end
end
end
IRB.initialize_tracer
end
