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Explicitly test for undefined arguments to handle false values like 0

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This commit is contained in:
Ian Price 2015-06-24 19:57:28 +01:00
parent b631576f13
commit 89029a54f4
3 changed files with 52 additions and 8 deletions
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39
module/language/javascript.scm
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@ -15,6 +15,8 @@
make-branch branch
make-var var
make-binop binop
make-ternary ternary
make-prefix prefix
print-statement))
@ -59,6 +61,8 @@
(define-js-type branch test then else)
(define-js-type var id exp)
(define-js-type binop op arg1 arg2)
(define-js-type ternary test then else)
(define-js-type prefix op expr)
(define (unparse-js exp)
(match exp
@ -85,7 +89,12 @@
(($ var id exp)
`(var ,id ,(unparse-js exp)))
(($ binop op arg1 arg2)
`(binop ,op ,(unparse-js arg1) ,(unparse-js arg2)))))
`(binop ,op ,(unparse-js arg1) ,(unparse-js arg2)))
(($ ternary test then else)
`(ternary ,(unparse-js test) ,(unparse-js then) ,(unparse-js else)))
(($ prefix op expr)
`(prefix ,op ,(unparse-js expr)))
))
(define (print-exp exp port)
(match exp
@ -136,17 +145,41 @@
(print-binop op port)
(display "(" port)
(print-exp arg2 port)
(display ")" port))))
(display ")" port))
(($ ternary test then else)
(display "(" port)
(print-exp test port)
(display ") ? (" port)
(print-exp then port)
(display ") : (" port)
(print-exp else port)
(display ")" port))
(($ prefix op exp)
(print-prefix op port)
(display "(" port)
(print-exp exp port)
(display ")" port))
))
(define (print-binop op port)
(case op
((or) (display "||" port))
((and) (display "&&" port))
((=) (display "==" port))
((+ - < <= > >=) (format port "~a" op))
((+ - < <= > >= ===) (format port "~a" op))
(else
(throw 'unprintable-binop op))))
(define (print-prefix op port)
(case op
((not) (display "!" port))
((typeof + -)
(format port "~a" op))
(else
(throw 'unprintable-prefix op))))
(define (print-statement stmt port)
(match stmt
(($ var id exp)