(in-package #:sod)

(defun try-parse* (parser string)
  (call-with-module-environment
   (lambda ()
     (let* ((char-scanner (make-string-scanner string))
	    (scanner (make-instance 'sod-token-scanner
				    :char-scanner char-scanner)))
       (funcall parser scanner)))))

(defmacro try-parse ((scanner string) &body parser)
  `(try-parse* (lambda (,scanner)
		 (with-parser-context
		     (token-scanner-context :scanner ,scanner)
		   ,@parser))
	       ,string))