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require_relative '../../puppet/thread_local'
module Puppet
module Pops
# Utility class for keeping track of the "Puppet stack", ie the file
# and line numbers of Puppet Code that created the current context.
#
# To use this make a call with:
#
# ```rb
# Puppet::Pops::PuppetStack.stack(file, line, receiver, message, args)
# ```
#
# To get the stack call:
#
# ```rb
# Puppet::Pops::PuppetStack.stacktrace
# ```
#
# or
#
# ```rb
# Puppet::Pops::PuppetStack.top_of_stack
# ```
#
# To support testing, a given file that is an empty string, or nil
# as well as a nil line number are supported. Such stack frames
# will be represented with the text `unknown` and `0ยด respectively.
module PuppetStack
@stack = Puppet::ThreadLocal.new { Array.new }
def self.stack(file, line, obj, message, args, &block)
file = 'unknown' if (file.nil? || file == '')
line = 0 if line.nil?
result = nil
@stack.value.unshift([file, line])
begin
if block_given?
result = obj.send(message, *args, &block)
else
result = obj.send(message, *args)
end
ensure
@stack.value.shift()
end
result
end
def self.stacktrace
@stack.value.dup
end
# Returns an Array with the top of the puppet stack, or an empty
# Array if there was no such entry.
def self.top_of_stack
@stack.value.first || []
end
end
end
end
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