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(in-package #:monparser)
(defmacro literal (word)
(when (not (stringp word))
(error "Literal only accepts strings as input."))
(let ((binding-list '())
(name-list '()))
(loop :for c :across word :do
(when c
(let ((name (gensym)))
(push name name-list)
(push `(,name (unit ,c)) binding-list))))
`(comp ,(reverse binding-list)
,(cons 'list (reverse name-list)))))
(defparameter nothing
(new nil))
(defun optional (p)
(one-of p nothing))
(defun many (p &key all)
(comp ((x p)
(xs (if all
(one-of end
(many p :all all))
(optional (many p)))))
(if x (cons x xs) xs)))
(defun repeat (p min &optional (max 0))
(if (> min 0)
(comp ((x p)
(xs (repeat p (1- min) (1- max))))
(cons x xs))
(if (> max 0)
(comp ((x (optional p))
(xs (repeat p 0 (if x (1- max) 0))))
(if x (cons x xs) x))
nothing)))
(defun whitespace? (x)
(or (char= x #\Space)
(not (graphic-char-p x))))
(defun separated-list (p separator)
(comp ((v p)
(sep (optional separator))
(vn (if sep
(separated-list p separator)
nothing)))
(cons v vn)))
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