defpackage my parser use common-lisp export run in-package my parser p

  • Anonymous
  • Common Lisp
  • 14 Oct 2009 
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(defpackage :my.parser



  (:use :common-lisp)



  (:export :run))







(in-package :my.parser)







;;; package vars







(defvar *characters* (make-hash-table))



(defvar *words* (make-hash-table))



(defvar *fname* "infile.txt")



(defvar *f-processor*)







;;; CLASSes







(defclass token ()



  ((cnt



	:initform 0



	:accessor cnt)))







(defclass gramma (token)



  ((symb



	:initarg :symb



	:initform (error "empty symb init")



	:accessor symb)))







;;; MACROses







(defmacro insert-hash (element hashtable)



  `(multiple-value-bind (val result) (gethash ,element ,hashtable)



	(if result



		(incf (cnt val) 1)



		(setf (gethash ,element ,hashtable)



			  (make-instance 'gramma :symb ,element)))))







(defmacro show-sorted-hash (hashtable)



  `(let ((lst nil))



	 (maphash #'(lambda (k v)



				  (push (cons k (cnt v)) lst))



			  ,hashtable)



	 (sort lst #'(lambda (a b)



				   (< (cdr a) (cdr b))))



	 (mapcar #'(lambda (a)



				 (format t "~a = ~a~%" (car a) (cdr a)))



			 lst)))







;;; METHODs







(defgeneric processor (character) ; generic



  (:documentation "abstract processor"))







(defmethod processor (character)



  (insert-hash character *characters*))







(let ((ws nil)) ; lexical closure 



  (defmethod processor :before (character) ; before combinator



	(if (not (eql character #\Space))



		(push character ws)



		(let ((word (concatenate 'string (reverse ws))))



		  (insert-hash word *words*)



		  (setf ws nil)))))











;;; EXPORTs











(defun run (&optional



				(fname "infile.txt")



				(f-processor #'processor))



  (clrhash *characters*)



  (clrhash *words*)



  (setf *fname* fname)



  (setf *f-processor* f-processor)



  (with-open-file (file-stream *fname*)



	(loop



	   (let ((character (read-char file-stream nil)))



		 (if character



			 (funcall *f-processor* character) ; high order method (+ combinator of methods)



			 (return)))))



  (show-sorted-hash *characters*)



  (show-sorted-hash *words*)



  (setf *flag-prepared* nil)



  'done)
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