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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)
(coerce ,(cons 'list (reverse name-list)) 'string))))
(defparameter nothing
(new nil))
(defun optional (p)
(one-of p nothing))
(defun many (p)
(comp ((x p)
(xs (if x
(optional (many p))
(fail "Parsing result is empty."))))
(cons x 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)
(some (lambda (y) (char= x y)) '(#\Space #\Newline #\Return #\Tab)))
(defparameter whitespace
(optional (many (unit whitespace?))))
(defun separated-list (p separator)
(comp ((v p)
(sep (optional separator))
(vn (if sep
(separated-list p separator)
nothing)))
(cons v vn)))
(defun surrounded (p left right)
(comp ((_ left)
(body p)
(_ right))
body))
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