Module: Wacktrace

Defined in:
lib/wacktrace.rb,
lib/wacktrace/version.rb

Defined Under Namespace

Classes: Error

Constant Summary collapse

VERSION = 
"1.0.1"

Class Method Summary collapse

Class Method Details

.add_to_stack(lines, &real) ⇒ Object

Runs the given block with the given lines inserted into the call stack above it. Lines should be an array like:

[

["somemethod1", 111, "somefile1"],
["somemethod2", 222, "somefile2"],
["somemethod3", 333, "somefile3"],

]

That will result in a strack trace like:

"somefile3:333:in ` somemethod3'",
"somefile2:222:in ` somemethod2'",
"somefile1:111:in ` somemethod1'",



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# File 'lib/wacktrace.rb', line 23

def add_to_stack(lines, &real)
  if lines.length <= 0
    return real.call
  end

  # If stack traces are being printed newest-to-oldest, we need to reverse
  # the input lines in order to have them print out readably.
  if detect_order == :recent_first
    lines.reverse!
  end

  lines = fix_duplicate_methods(lines)

  # Create a namespace for all these methods so we don't polute the global
  # namespace.
  container_class = Class.new

  raise "add to stack missing block" unless block_given?

  lines = lines.map { |line| [clean_method_name(line[0]), line[1], line[2]] }

  # Define each method in series: a calls b, b calls c, and so on.  The last
  # line does not get a method defined here.
  lines.each_cons(2) do |line_1, line_2|
    # puts "defining '#{line_1[0]}'"
    success = true
    define_stack_level(container_class, line_1, line_2[0])
  end

  last = lines.last
  define_stack_level(container_class, last, 'ending')
  container_class.define_singleton_method("ending") { real.call }
  return container_class.send(lines.first[0])
end

.add_to_stack_from_lyrics(lyrics, filename, &block) ⇒ Object

This is a convenience method to construct a stack trace from a single string with a bunch of newlines (eg the lyrics to a song or words to a poem). It’ll use the same filename for each line.



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# File 'lib/wacktrace.rb', line 61

def add_to_stack_from_lyrics(lyrics, filename, &block)
  lines = lyrics.split("\n").map.with_index do |line, i|
    [line, i, filename]
  end
  add_to_stack(lines, &block)
end