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module BinData
# Turn on trace information when reading a BinData object.
# If +block+ is given then the tracing only occurs for that block.
# This is useful for debugging a BinData declaration.
def trace_reading(io = STDERR)
@tracer = Tracer.new(io)
[BasePrimitive, Choice].each(&:turn_on_tracing)
if block_given?
begin
yield
ensure
[BasePrimitive, Choice].each(&:turn_off_tracing)
@tracer = nil
end
end
end
# reference to the current tracer
@tracer ||= nil
class Tracer # :nodoc:
def initialize(io)
@trace_io = io
end
def trace(msg)
@trace_io.puts(msg)
end
def trace_obj(obj_name, val)
if val.length > 30
val = val.slice(0..30) + "..."
end
trace "#{obj_name} => #{val}"
end
end
def trace_message # :nodoc:
yield @tracer
end
module_function :trace_reading, :trace_message
module TraceHook
def turn_on_tracing
if !method_defined? :do_read_without_hook
alias_method :do_read_without_hook, :do_read
alias_method :do_read, :do_read_with_hook
end
end
def turn_off_tracing
if method_defined? :do_read_without_hook
alias_method :do_read, :do_read_without_hook
remove_method :do_read_without_hook
end
end
end
class BasePrimitive < BinData::Base
extend TraceHook
def do_read_with_hook(io)
do_read_without_hook(io)
BinData.trace_message do |tracer|
value_string = _value.inspect
tracer.trace_obj(debug_name, value_string)
end
end
end
class Choice < BinData::Base
extend TraceHook
def do_read_with_hook(io)
BinData.trace_message do |tracer|
selection_string = eval_parameter(:selection).inspect
tracer.trace_obj("#{debug_name}-selection-", selection_string)
end
do_read_without_hook(io)
end
end
end
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