d7a87c79e0
Changed backtracking algorithm, runtime representations
- syntax classes, ~describe no longer implicitly commit
- ~describe no longer delimits effect of cut
Added keyword & optional args for stxclasses
Added ~do and #:do, ~post, ~commit and #:commit,
~delimit-cut and #:no-delimit-cut
Added syntax/parse/debug, syntax/parse/experimental/*
- expr/c for contracting macro sub-expressions
moved from syntax/parse to syntax/parse/experimental/contract
- syntax class reflection (~reflect, ~splicing-reflect)
- eh-alternative-sets (~eh-var)
- provide-syntax-class/contract
(only for params, not attrs so far)
Changed ~fail to not include POST progress (#:fail still does)
old (~fail _) is now (~post (~fail _))
Made msg argument of ~fail optional
Removed generic "repetition constraint violated" msg
Removed atom-in-list stxclass
Removed unnecessary datum->syntax on cdr of pair pattern
massive improvements to long-list microbenchmarks
Optimization: integrable syntax classes (id, expr, keyword)
need better measurements
Optimization: ad hoc elimination of head/tail choice point
for (EH ... . ()) patterns
Added unstable/wrapc (proc version of expr/c)
132 lines
3.6 KiB
Racket
132 lines
3.6 KiB
Racket
#lang racket/base
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(require rackunit
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syntax/parse
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syntax/parse/private/rep-attrs
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(only-in syntax/parse/private/runtime attribute-binding)
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(for-syntax racket/base))
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(provide tok
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terx
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terx*
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tcerr
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bound
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s=
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a=
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convert-syntax-error)
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#|
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Testing forms
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-------------
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(tok stx-template pattern [#:pre pre-pattern ...] [#:post post-pattern ...])
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-- pattern should succeed parsing stx (pre and post patterns should fail)
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(terx stx-template pattern ErrorPattern ...)
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(terx* stx-template (pattern ...) ErrorPattern ...)
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where ErrorPattern is regexp | (not regexp)
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-- pattern should fail with exn message matching every ErrorPattern
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(tcerr tc-name-expr expr ErrorPattern ...)
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-- delays syntax errors in expr until runtime, error msg must every pattern
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Auxiliaries
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-----------
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(bound (name depth [syntax?]) ...)
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-- checks that name is an attr w/ proper depth and syntax?
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(s= stx-template sexpr)
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-- checks that stx-template produces stx w/ datum equivalent to sexpr
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(a= attr expr)
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-- checks that attr has value equal to expr
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|#
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;; tok = test pattern ok
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(define-syntax tok
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(syntax-rules ()
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[(tok s p expr #:pre [pre-p ...] #:post [post-p ...])
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(test-case (format "line ~s: ~s match ~s"
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(syntax-line (quote-syntax s))
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's 'p)
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(syntax-parse (quote-syntax s)
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[pre-p (error 'wrong-pattern "~s" 'pre-p)] ...
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[p expr]
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[post-p (error 'wrong-pattern "~s" 'post-p)] ...)
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(void))]
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[(tok s p expr)
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(tok s p expr #:pre () #:post ())]
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[(tok s p)
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(tok s p 'ok)]))
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(define-syntax-rule (bound b ...)
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(begin (bound1 b) ...))
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(define-syntax bound1
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(syntax-rules ()
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[(bound1 (name depth))
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(let ([a (attribute-binding name)])
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(check-pred attr? a)
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(when (attr? a)
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(check-equal? (attr-depth a) 'depth)))]
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[(bound1 (name depth syntax?))
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(let ([a (attribute-binding name)])
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(check-pred attr? a)
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(when (attr? a)
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(check-equal? (attr-depth a) 'depth)
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(check-equal? (attr-syntax? a) 'syntax?)))]))
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(define-syntax-rule (s= t v)
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(check-equal? (syntax->datum #'t) v))
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(define-syntax-rule (a= a v)
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(check-equal? (attribute a) v))
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(define-syntax-rule (terx s p rx ...)
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(terx* s [p] rx ...))
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(define-syntax terx*
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(syntax-rules ()
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[(terx s [p ...] rx ...)
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(test-case (format "line ~s: ~a match ~s for error"
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(syntax-line (quote-syntax s))
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's '(p ...))
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(check-exn (lambda (exn)
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(erx rx (exn-message exn)) ... #t)
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(lambda ()
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(syntax-parse (quote-syntax s)
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[p 'ok] ...)))
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(void))]))
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(define-syntax erx
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(syntax-rules (not)
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[(erx (not rx) msg)
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(check (compose not regexp-match?) rx msg)]
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[(erx rx msg)
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(check regexp-match? rx msg)]))
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;; ====
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(define-syntax-rule (tcerr name expr rx ...)
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(test-case name
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(check-exn (lambda (exn)
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(define msg (exn-message exn))
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(erx rx msg) ...
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#t)
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(lambda ()
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(parameterize ((error-print-source-location #f))
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(convert-syntax-error expr))))
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(void)))
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(define-syntax (convert-syntax-error stx)
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(syntax-case stx ()
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[(_ expr)
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(with-handlers ([exn:fail:syntax?
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(lambda (e)
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#`(error '#,(exn-message e)))])
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(parameterize ((error-print-source-location #f))
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(local-expand #'expr 'expression null)))]))
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