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Added note about qq support

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Justin Ethier 2015-05-29 21:02:15 -04:00
parent 1d5892fd8d
commit 309c029097
1 changed files with 7 additions and 0 deletions
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7
eval.scm
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@ -35,6 +35,9 @@
(define (quoted? exp)
(tagged-list? exp 'quote))
(define (quasiquoted? exp)
(tagged-list? exp 'quasiquote))
(define (assignment? exp)
(tagged-list? exp 'set!))
(define (assignment-variable exp) (cadr exp))
@ -352,6 +355,7 @@
(cond ((self-evaluating? exp)
(analyze-self-evaluating exp))
((quoted? exp) (analyze-quoted exp))
((quasiquoted? exp) (analyze-quasiquoted exp))
((variable? exp) (analyze-variable exp))
((assignment? exp) (analyze-assignment exp))
((definition? exp) (analyze-definition exp))
@ -389,6 +393,9 @@
(let ((qval (cadr exp)))
(lambda (env) qval)))
(define (analyze-quasiquoted exp)
(error "quasiquote not supported yet by eval"))
(define (analyze-variable exp)
(lambda (env) (lookup-variable-value exp env)))