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(in-package #:monparser)
(defstruct parsing
tree
left)
(defstruct failure
place
message)
(defun new (tree)
(lambda (input &key lazy)
(declare (ignore lazy))
(make-parsing :tree tree :left input)))
(defmacro bind (parser f)
`(lambda (input &key lazy)
(let ((r (funcall ,parser input)))
(cond ((parsing-p r)
(if lazy
(lambda (ignored-input &key lazy)
(declare (ignore ignored-input))
(funcall (funcall ,f (parsing-tree r) input)
(parsing-left r)
:lazy lazy))
(funcall (funcall ,f (parsing-tree r) input)
(parsing-left r))))
((failure-p r)
r)
(t (error (format nil "Invalid return value: ~a" r)))))))
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