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(defpackage #:cparse
(:use #:common-lisp #:cutil #:clex #:cabs-syn)
(:export
#:parse))
(in-package #:cparse)
(defclass <exp-elem> () () (:metaclass <abstract-class>))
(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 (make-instance (find-class '<string-lexer>) 's str))
(tok (lexer cl)))
(cond ((instancep tok (find-class '<lint>))
(make-instance (find-class '<line>) 'n n 'c (parse-cmd cl)))
((instancep tok (find-class '<lident>))
(cond ((string= (ident tok) "LIST")
(make-instance (find-class '<phrase-list>)))
((string= (ident tok) "RUN")
(make-instance (find-class '<phrase-run>)))
((string= (ident tok) "END")
(make-instance (find-class '<phrase-p-end>)))
(t (error "Parse error"))))
(t (error "Parse error")))))
(provide "cparse")
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