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(in-package #:monparser)
(defun parse (parser data)
(if (typep data 'string)
(funcall parser
(make-instance 'text :data data)
(make-instance 'text :data data))
(error "Only string parsing is allowed.")))
(defun append-on-failure (p message)
(lambda (start input)
(let ((result (funcall p start input)))
(if (failure-p result)
(make-failure :place (failure-place result)
:message (concatenate 'string message (failure-message result))
:priority (failure-priority result))
result))))
(defmacro defparser (name args parser)
(let ((message (format nil "In ~a:~&" name)))
(cond ((equal args :const)
`(defparameter ,name (append-on-failure ,parser ,message)))
((listp args)
`(defun ,name ,args (append-on-failure ,parser ,message)))
(t (error
(format nil "Cannot define ~a: ~a is not :const or a list." name args))))))
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