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)
38 lines
862 B
Racket
38 lines
862 B
Racket
#lang racket/base
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(require (for-syntax racket/base))
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;; == Keywords
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(define-syntax-rule (define-keyword name)
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(begin
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(provide name)
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(define-syntax name
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(lambda (stx)
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(raise-syntax-error #f "keyword used out of context" stx)))))
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(define-keyword pattern)
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(define-keyword ~var)
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(define-keyword ~datum)
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(define-keyword ~literal)
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(define-keyword ~and)
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(define-keyword ~or)
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(define-keyword ~not)
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(define-keyword ~seq)
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(define-keyword ~between)
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(define-keyword ~once)
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(define-keyword ~optional)
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(define-keyword ~rest)
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(define-keyword ~describe)
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(define-keyword ~!)
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(define-keyword ~bind)
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(define-keyword ~fail)
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(define-keyword ~parse)
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(define-keyword ~do)
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(define-keyword ...+)
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(define-keyword ~delimit-cut)
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(define-keyword ~commit)
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(define-keyword ~reflect)
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(define-keyword ~splicing-reflect)
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(define-keyword ~post)
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(define-keyword ~eh-var)
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