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Added helper functions for SEXP/AST conversions

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Added: ast:ast->sexp and ast:sexp->ast
This commit is contained in:
Justin Ethier 2018-05-22 12:45:17 -04:00
parent e6d5de2702
commit 7dbfb64205
1 changed files with 56 additions and 0 deletions
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56
scheme/cyclone/ast.sld
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@ -25,8 +25,14 @@
ast:set-lambda-has-cont!
ast:get-next-lambda-id!
ast:ast->pp-sexp
ast:ast->sexp
ast:sexp->ast
)
(begin
(define ast:ast->sexp ast->sexp)
(define ast:sexp->ast sexp->ast)
(define *lambda-id* 0)
(define (ast:get-next-lambda-id!)
@ -78,4 +84,54 @@
((app? exp)
(map ast:ast->pp-sexp exp))
(else exp)))
;; Transform AST back to an equivalent sexp
(define (ast->sexp exp)
(cond
((ast:lambda? exp)
(let* ((id (ast:lambda-id exp))
(has-cont (ast:lambda-has-cont exp))
(sym 'lambda))
`(,sym ,(ast:lambda-args exp)
,@(map ast->sexp (ast:lambda-body exp)))))
((quote? exp) exp)
((const? exp) exp)
((ref? exp) exp)
((define? exp)
`(define ,(define->var exp)
,@(ast->sexp (define->exp exp))))
((set!? exp)
`(set! ,(set!->var exp)
,(ast->sexp (set!->exp exp))))
((if? exp)
`(if ,(ast->sexp (if->condition exp))
,(ast->sexp (if->then exp))
,(ast->sexp (if->else exp))))
((app? exp)
(map ast->sexp exp))
(else exp)))
;; Transform given SEXP into AST form.
(define (sexp->ast exp)
(cond
((lambda? exp)
(ast:make-lambda
(lambda->formals exp)
(map sexp->ast (lambda->exp exp))))
((quote? exp) exp)
((const? exp) exp)
((ref? exp) exp)
((define? exp)
`(define ,(define->var exp)
,@(sexp->ast (define->exp exp))))
((set!? exp)
`(set! ,(set!->var exp)
,(sexp->ast (set!->exp exp))))
((if? exp)
`(if ,(sexp->ast (if->condition exp))
,(sexp->ast (if->then exp))
,(sexp->ast (if->else exp))))
((app? exp)
(map sexp->ast exp))
(else exp)))
))