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add walk-symbol

This commit is contained in:
Yuichi Nishiwaki 2014-07-19 18:14:11 +09:00
parent 346494524f
commit 2c1db4472b
1 changed files with 25 additions and 27 deletions
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52
piclib/picrin/macro.scm
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@ -37,20 +37,26 @@
(vector-map proc expr)
(proc expr)))))
(define (make-syntactic-closure env free form)
(define cache (make-dictionary))
(define (walk-symbol proc expr)
(walk
(lambda (atom)
(if (not (symbol? atom))
atom
(if (memq atom free)
atom
(if (dictionary-has? cache atom)
(dictionary-ref cache atom)
(begin
(define id (make-identifier atom env))
(dictionary-set! cache atom id)
id)))))
(if (symbol? atom)
(proc atom)
atom))
expr))
(define (make-syntactic-closure env free form)
(define cache (make-dictionary))
(walk-symbol
(lambda (sym)
(if (memq sym free)
sym
(if (dictionary-has? cache sym)
(dictionary-ref cache sym)
(begin
(define id (make-identifier sym env))
(dictionary-set! cache sym id)
id))))
form))
(define (close-syntax form env)
@ -115,6 +121,11 @@
(dictionary-set! rcache sym id)
id)))
(define (uninject sym)
(if (dictionary-has? icache* sym)
(dictionary-ref icache* sym)
(rename sym)))
(define (compare x y)
(if (not (symbol? x))
#f
@ -123,23 +134,10 @@
(identifier=? mac-env x mac-env y))))
(define (wrap expr)
(walk
(lambda (atom)
(if (not (symbol? atom))
atom
(inject atom)))
expr))
(walk-symbol inject expr))
(define (unwrap expr)
(define cache (make-dictionary))
(walk
(lambda (atom)
(if (not (symbol? atom))
atom
(if (dictionary-has? icache* atom)
(dictionary-ref icache* atom)
(rename atom))))
expr))
(walk-symbol uninject expr))
(unwrap (f (wrap expr) inject compare))))