egison-pattern-src
Manipulating Egison patterns: abstract syntax, parser, and pretty-printer
https://github.com/egison/egison-pattern-src#readme
| Version on this page: | 0.2.1.0 |
| LTS Haskell 24.18: | 0.2.1.2@rev:1 |
| Stackage Nightly 2025-11-03: | 0.2.1.2@rev:1 |
| Latest on Hackage: | 0.2.1.2@rev:1 |
Maintained by coord_e, Satoshi Egi
This version can be pinned in stack with:
egison-pattern-src-0.2.1.0@sha256:8f4e72f25abb4f6cf8f1283774ae0d5030c44dad32838de2423c8f9644529c78,4197Module documentation for 0.2.1.0
- Language
- Language.Egison
- Language.Egison.Parser
- Language.Egison.Pretty
- Language.Egison.Syntax
- Language.Egison
Depends on 9 packages(full list with versions):
Used by 2 packages in nightly-2020-03-25(full list with versions):
Egison Pattern Source
The egison-pattern-src provides a standalone syntax definition for patterns in Egison programming language. This package enables you to embed Egison’s patterns in your parser (pretty-printer) by supplying expression and name parsers (printers) externally.
Syntax
The following is a simplified syntax of pattern expressions where x, v, op and e are respectively names, variable names, user-defined infix operators and expressions in host language.
p ::= _ (wildcard pattern)
| $v (pattern variable)
| #e (value pattern)
| ?e (predicate pattern)
| (p_1, p_2, ..., p_n) (tuple pattern)
| [p_1, p_2, ..., p_n] (collection pattern)
| p & p (and pattern)
| p | p (or pattern)
| !p (not pattern)
| p op p (user-defined infix pattern)
| x p_1 p_2 ... p_n (constructor pattern)
License
egison-pattern-src is distributed as open source software under the terms of the 3 clause BSD License. See LICENSE for details.