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)
32 lines
1.1 KiB
Racket
32 lines
1.1 KiB
Racket
#lang scribble/doc
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@(require scribble/manual
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(for-label syntax/parse))
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@title[#:tag "stxparse" #:style '(toc)]{Parsing and classifying syntax}
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The @schememodname[syntax/parse] library provides a framework for
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writing macros and processing syntax. The library provides a powerful
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language of syntax patterns, used by the pattern-matching form
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@scheme[syntax-parse] and the specification form
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@scheme[define-syntax-class]. Macros that use @scheme[syntax-parse]
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automatically generate error messages based on descriptions and
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messages embedded in the macro's syntax patterns.
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@defmodule[syntax/parse]
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@local-table-of-contents[]
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@include-section["parse/intro.scrbl"]
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@include-section["parse/examples.scrbl"]
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@include-section["parse/parsing.scrbl"]
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@include-section["parse/patterns.scrbl"]
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@include-section["parse/litconv.scrbl"]
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@include-section["parse/lib.scrbl"]
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@;{Description of how error reporting works}
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@;{and designing for good errors}
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@;{Cut and Commit for efficiency and error reporting.}
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@include-section["parse/debug.scrbl"]
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@include-section["parse/experimental.scrbl"]
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