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https://github.com/ashinn/chibi-scheme.git
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8b5eb68238
They can be close()d explicitly with close-file-descriptor, and will close() on gc, but only explicitly closing the last port on them will close the fileno. Notably needed for network sockets where we open separate input and output ports on the same socket.
79 lines
3.4 KiB
Scheme
79 lines
3.4 KiB
Scheme
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(define-library (chibi parse)
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(export grammar grammar/unmemoized define-grammar define-grammar/unmemoized
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call-with-parse parse parse-fully parse-fold
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parse->list parse-fully->list
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file->parse-stream string->parse-stream parse-stream-substring
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parse-stream-start? parse-stream-end? parse-stream-ref
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parse-anything parse-nothing parse-epsilon
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parse-seq parse-and parse-or parse-not
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parse-repeat parse-repeat+ parse-optional
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parse-map parse-map-substring parse-ignore parse-assert
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parse-atomic parse-commit parse-memoize
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parse-char parse-not-char parse-char-pred
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parse-string parse-token parse-sre
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parse-beginning parse-end
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parse-beginning-of-line parse-end-of-line
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parse-beginning-of-line parse-end-of-line
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parse-beginning-of-word parse-end-of-word
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parse-word parse-word+
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parse-with-failure-reason)
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(import (chibi) (chibi char-set) (srfi 9))
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(include "parse/parse.scm")
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(cond-expand
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(chibi
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(begin
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(define-syntax grammar-bind
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(er-macro-transformer
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(lambda (expr rename compare)
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(let ((name (cadr expr))
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(k (car (cddr expr)))
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(f (cadr (cddr expr)))
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(bindings (car (cddr (cddr expr)))))
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(if (and (identifier? name)
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(not (assq name bindings)))
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(let ((new-tmp (rename 'new-tmp))
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(save-tmp (rename 'save-tmp))
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(lambda_ (rename 'lambda))
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(set!_ (rename 'set!))
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(s (rename 's))
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(i (rename 'i))
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(sk (rename 'sk))
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(fk (rename 'fk))
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(r (rename 'r)))
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(append
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k
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(list
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`(,lambda_
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(,s ,i ,sk ,fk)
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((,lambda_ (,save-tmp)
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(,f ,s ,i
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(,lambda_ (,r ,s ,i ,fk)
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(,set!_ ,new-tmp ,r)
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(,sk ,r ,s ,i ,fk))
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(,lambda_ (,s ,i ,r)
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(,set!_ ,new-tmp ,save-tmp)
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(,fk ,s ,i ,r))))
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,new-tmp))
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(cons (list name new-tmp) bindings))))
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(append k (list f bindings)))))))))
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(else
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(begin
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(define-syntax grammar-bind
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(syntax-rules ()
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((grammar-bind name (k ...) f ((var tmp) ...))
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(let-syntax ((new-symbol?
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(syntax-rules (var ...)
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((new-symbol? name sk fk) sk)
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((new-symbol? _ sk fk) fk))))
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;; Bind the name only to the first instance in the pattern.
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(new-symbol?
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random-symbol-to-match
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(k ...
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(lambda (s i sk fk)
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(let ((save-tmp new-tmp))
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(f s i
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(lambda (r s i fk) (set! new-tmp r) (sk r s i fk))
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(lambda (s i r) (set! new-tmp save-tmp) (fk s i r)))))
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((var tmp) ... (name new-tmp)))
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(k ... f ((var tmp) ...)))))))))))
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