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psyntax: fold chi-top-sequence into chi-top
* module/ice-9/psyntax.scm (chi-top-sequence): Pull chi-top into the body of this toplevel begin expander. This will let us do r6rs toplevel expansion correctly. (chi-top): Remove. (macroexpand): Dispatch to chi-top-sequence directly.
This commit is contained in:
Andy Wingo
parent
249f2788c6
commit
4c2e13e548
1 changed files with 132 additions and 113 deletions
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@ -521,7 +521,7 @@
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;; (define-syntax) define-syntax
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;; (local-syntax . rec?) let-syntax/letrec-syntax
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;; (eval-when) eval-when
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;; #'. (<var> . <level>) pattern variables
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;; (syntax . (<var> . <level>)) pattern variables
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;; (global) assumed global variable
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;; (lexical . <var>) lexical variables
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;; (displaced-lexical) displaced lexicals
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@ -899,14 +899,136 @@
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(define chi-top-sequence
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(lambda (body r w s m esew mod)
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(build-sequence s
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(let dobody ((body body) (r r) (w w) (m m) (esew esew)
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(mod mod) (out '()))
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(if (null? body)
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(reverse out)
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(dobody (cdr body) r w m esew mod
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(cons (chi-top (car body) r w m esew mod) out)))))))
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(define (scan body r w s m esew mod exps)
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(define-syntax eval-if-c&e
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(syntax-rules ()
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((_ m e mod)
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(let ((x e))
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(if (eq? m 'c&e) (top-level-eval-hook x mod))
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x))))
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(cond
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((null? body)
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;; in reversed order
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exps)
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(else
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(call-with-values
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(lambda ()
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(call-with-values
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(lambda ()
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(let ((e (car body)))
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(syntax-type e r w (or (source-annotation e) s) #f mod #f)))
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(lambda (type value e w s mod)
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(case type
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((begin-form)
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(syntax-case e ()
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((_) exps)
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((_ e1 e2 ...)
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(scan #'(e1 e2 ...) r w s m esew mod exps))))
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((local-syntax-form)
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(chi-local-syntax value e r w s mod
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(lambda (body r w s mod)
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(scan body r w s m esew mod exps))))
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((eval-when-form)
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(syntax-case e ()
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((_ (x ...) e1 e2 ...)
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(let ((when-list (chi-when-list e #'(x ...) w))
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(body #'(e1 e2 ...)))
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(cond
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((eq? m 'e)
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(if (memq 'eval when-list)
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(scan body r w s
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(if (memq 'expand when-list) 'c&e 'e)
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'(eval)
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mod exps)
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(begin
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(if (memq 'expand when-list)
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(top-level-eval-hook
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(chi-top-sequence body r w s 'e '(eval) mod)
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mod))
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(values exps))))
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((memq 'load when-list)
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(if (or (memq 'compile when-list)
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(memq 'expand when-list)
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(and (eq? m 'c&e) (memq 'eval when-list)))
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(scan body r w s 'c&e '(compile load) mod exps)
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(if (memq m '(c c&e))
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(scan body r w s 'c '(load) mod exps)
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(values exps))))
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((or (memq 'compile when-list)
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(memq 'expand when-list)
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(and (eq? m 'c&e) (memq 'eval when-list)))
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(top-level-eval-hook
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(chi-top-sequence body r w s 'e '(eval) mod)
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mod)
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(values exps))
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(else
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(values exps)))))))
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((define-syntax-form)
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(let ((n (id-var-name value w)) (r (macros-only-env r)))
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(case m
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((c)
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(if (memq 'compile esew)
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(let ((e (chi-install-global n (chi e r w mod))))
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(top-level-eval-hook e mod)
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(if (memq 'load esew)
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(values (cons e exps))
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(values exps)))
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(if (memq 'load esew)
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(values (cons (chi-install-global n (chi e r w mod))
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exps))
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(values exps))))
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((c&e)
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(let ((e (chi-install-global n (chi e r w mod))))
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(top-level-eval-hook e mod)
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(values (cons e exps))))
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(else
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(if (memq 'eval esew)
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(top-level-eval-hook
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(chi-install-global n (chi e r w mod))
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mod))
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(values exps)))))
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((define-form)
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(let* ((n (id-var-name value w))
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;; Lookup the name in the module of the define form.
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(type (binding-type (lookup n r mod))))
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(case type
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((global core macro module-ref)
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;; affect compile-time environment (once we have booted)
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(if (and (memq m '(c c&e))
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(not (module-local-variable (current-module) n))
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(current-module))
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(let ((old (module-variable (current-module) n)))
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;; use value of the same-named imported variable, if
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;; any
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(if (and (variable? old) (variable-bound? old))
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(module-define! (current-module) n (variable-ref old))
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(module-add! (current-module) n (make-undefined-variable)))))
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(values
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(cons
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(eval-if-c&e m
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(build-global-definition s n (chi e r w mod))
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mod)
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exps)))
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((displaced-lexical)
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(syntax-violation #f "identifier out of context"
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e (wrap value w mod)))
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(else
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(syntax-violation #f "cannot define keyword at top level"
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e (wrap value w mod))))))
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(else
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(values (cons
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(eval-if-c&e m (chi-expr type value e r w s mod) mod)
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exps)))))))
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(lambda (exps)
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(scan (cdr body) r w s m esew mod exps))))))
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(call-with-values (lambda ()
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(scan body r w s m esew mod '()))
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(lambda (exps)
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(if (null? exps)
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(build-void s)
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(build-sequence s (reverse exps)))))))
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(define chi-install-global
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(lambda (name e)
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(build-global-definition
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@ -1054,109 +1176,6 @@
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((self-evaluating? e) (values 'constant #f e w s mod))
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(else (values 'other #f e w s mod)))))
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(define chi-top
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(lambda (e r w m esew mod)
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(define-syntax eval-if-c&e
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(syntax-rules ()
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((_ m e mod)
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(let ((x e))
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(if (eq? m 'c&e) (top-level-eval-hook x mod))
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x))))
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(call-with-values
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(lambda () (syntax-type e r w (source-annotation e) #f mod #f))
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(lambda (type value e w s mod)
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(case type
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((begin-form)
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(syntax-case e ()
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((_) (chi-void))
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((_ e1 e2 ...)
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(chi-top-sequence #'(e1 e2 ...) r w s m esew mod))))
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((local-syntax-form)
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(chi-local-syntax value e r w s mod
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(lambda (body r w s mod)
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(chi-top-sequence body r w s m esew mod))))
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((eval-when-form)
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(syntax-case e ()
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((_ (x ...) e1 e2 ...)
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(let ((when-list (chi-when-list e #'(x ...) w))
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(body #'(e1 e2 ...)))
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(cond
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((eq? m 'e)
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(if (memq 'eval when-list)
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(chi-top-sequence body r w s
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(if (memq 'expand when-list) 'c&e 'e)
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'(eval)
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mod)
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(begin
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(if (memq 'expand when-list)
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(top-level-eval-hook
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(chi-top-sequence body r w s 'e '(eval) mod)
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mod))
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(chi-void))))
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((memq 'load when-list)
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(if (or (memq 'compile when-list)
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(memq 'expand when-list)
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(and (eq? m 'c&e) (memq 'eval when-list)))
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(chi-top-sequence body r w s 'c&e '(compile load) mod)
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(if (memq m '(c c&e))
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(chi-top-sequence body r w s 'c '(load) mod)
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(chi-void))))
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((or (memq 'compile when-list)
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(memq 'expand when-list)
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(and (eq? m 'c&e) (memq 'eval when-list)))
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(top-level-eval-hook
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(chi-top-sequence body r w s 'e '(eval) mod)
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mod)
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(chi-void))
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(else (chi-void)))))))
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((define-syntax-form)
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(let ((n (id-var-name value w)) (r (macros-only-env r)))
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(case m
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((c)
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(if (memq 'compile esew)
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(let ((e (chi-install-global n (chi e r w mod))))
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(top-level-eval-hook e mod)
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(if (memq 'load esew) e (chi-void)))
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(if (memq 'load esew)
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(chi-install-global n (chi e r w mod))
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(chi-void))))
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((c&e)
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(let ((e (chi-install-global n (chi e r w mod))))
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(top-level-eval-hook e mod)
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e))
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(else
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(if (memq 'eval esew)
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(top-level-eval-hook
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(chi-install-global n (chi e r w mod))
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mod))
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(chi-void)))))
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((define-form)
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(let* ((n (id-var-name value w))
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;; Lookup the name in the module of the define form.
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(type (binding-type (lookup n r mod))))
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(case type
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((global core macro module-ref)
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;; affect compile-time environment (once we have booted)
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(if (and (memq m '(c c&e))
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(not (module-local-variable (current-module) n))
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(current-module))
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(let ((old (module-variable (current-module) n)))
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;; use value of the same-named imported variable, if
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;; any
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(if (and (variable? old) (variable-bound? old))
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(module-define! (current-module) n (variable-ref old))
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(module-add! (current-module) n (make-undefined-variable)))))
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(eval-if-c&e m
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(build-global-definition s n (chi e r w mod))
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mod))
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((displaced-lexical)
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(syntax-violation #f "identifier out of context"
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e (wrap value w mod)))
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(else
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(syntax-violation #f "cannot define keyword at top level"
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e (wrap value w mod))))))
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(else (eval-if-c&e m (chi-expr type value e r w s mod) mod)))))))
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(define chi
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(lambda (e r w mod)
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(call-with-values
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@ -2375,8 +2394,8 @@
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;; the object file if we are compiling a file.
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(set! macroexpand
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(lambda* (x #:optional (m 'e) (esew '(eval)))
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(chi-top x null-env top-wrap m esew
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(cons 'hygiene (module-name (current-module))))))
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(chi-top-sequence (list x) null-env top-wrap #f m esew
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(cons 'hygiene (module-name (current-module))))))
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(set! identifier?
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(lambda (x)
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