blob: 3e26a35439c58b53a3404c6bc6fbf136e2057841 (
plain) (
blame)
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
|
(defpackage #:parsing
(:use #:openlisp #:lex #:abs-syn)
(:export
#:parse))
(in-package #:parsing)
(defclass <exp-elem> () () (:abstractp t))
(defclass <elem-exp> (<exp-elem>) ((expr :accessor expr)))
(defclass <elem-bin> (<exp-elem>) ((bin-op :accessor bin-op)))
(defclass <elem-unr> (<exp-elem>) ((unr-op :accessor unr-op)))
(defclass <elem-lp> (<exp-elem>) ())
(defun unr-symb (s)
(cond ((string= s "!") 'not)
((string= s "-") 'uminus)
(t (error "Parse error"))))
(defun bin-symb (s)
(cond ((string= s "+") 'plus)
((string= s "-") 'minus)
((string= s "*") 'mult)
((string= s "/") 'div)
((string= s "%") 'mod)
((string= s "=") 'equal)
((string= s "<") 'less)
((string= s "<=") 'lesseq)
((string= s ">") 'great)))
(defun parse (str)
(let* ((cl (init-lex str))
(tok (lexer cl)))
(cond ((instancep tok (class <lint>))
(create (class <line>) 'n n 'c (parse-cmd cl)))
((instancep tok (class <lident>))
(cond ((string= (ident tok) "LIST")
(create (class <phrase-list>)))
((string= (ident tok) "RUN")
(create (class <phrase-run>)))
((string= (ident tok) "END")
(create (class <phrase-p-end>)))
(t (error "Parse error"))))
(t (error "Parse error")))))
(provide "parsing")
|