call/cc in Lua - Possible?

Question

The Wikipedia article on Continuation says:
\"In any language which supports closures, it is possible to write programs in continuation passing style an

Answer 1

Here's my cps-convert in scheme, just pass it every function you want to convert.

(define (cps-convert function . functions)
  # Since "help" is called at 2 different places...
  (define (help) (error "syntax: (cps-convert f1 f2 ...)"))
  # Single function converter
  (define (convert func)
    # "name" contains the function's name prefixed with "cps-"
    (let ([name (string->symbol
                          (string-append "cps-" (symbol->string func)))])
      # Dirty hack to define "cps-*" in the global environment
     `(eval '(begin
                   # Necessary to prevent the function from being evaluated
                   (define ,name #f)
                                # Magic
                   (set! ,name (lambda (k . args) (k (func args)))))
                 # Global environment
                 (interaction-environment))))
  # Prerequisite... Call help if condition not met
  (if (symbol? function)
      # function is a symbol
      (cond
        # If there is only one function to convert
        [(null? functions) (convert function)]
        # Else ensure every other "functions" are symbols and convert each
        [(every symbol? functions) (apply convert function functions)]
        # Oops! Condition not met!
        [else (help)])
      # Else clause from previous "if"
      (help)))