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

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
(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)