55 lines
1.4 KiB
Plaintext
55 lines
1.4 KiB
Plaintext
@<EmacsMode "-*- preserves -*-">
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version 1 .
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Schema = <schema {
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version: Version
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definitions: { symbol: Pattern ...:... }
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}>.
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; version 1 .
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Version = 1 .
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Pattern = <<or> [
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; special builtins or <<atom> symbol>
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<atom @atomKind <<or> [=Boolean =Float =Double =SignedInteger =String =ByteString =Symbol]>>
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; =symbol, <<lit> any>, or plain non-symbol atom
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<lit @value any>
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; symbol
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<ref @name symbol>
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; Pattern / Pattern / ...
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; <<or> [Pattern Pattern ...]>
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; and the empty pattern is <<or> []>
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<or @patterns [Pattern ...]>
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; Pattern & Pattern & ...
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; <<and> [Pattern Pattern ...]>
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; and the universal pattern, "any", is <<and> []>
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<and @patterns [Pattern ...]>
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; <label a b c> ----> <rec <lit label> <tuple [<ref a> <ref b> <ref c>]>>
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; except for record labels
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; <<rec> x y> ---> <rec <ref x> <ref y>>
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<rec @label Pattern @fields Pattern>
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; [a b c] ----> <tuple [<ref a> <ref b> <ref c>]>
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<tuple @patterns [NamedPattern ...]>
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; [a b c ...] ----> <tuple* [<ref a> <ref b>] <ref c>]>
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<tuple* @fixed [NamedPattern ...] @variable NamedPattern>
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; #{p} ----> <setof <ref p>>
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<setof @pattern Pattern>
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; {k: v, ...:...} ----> <dictof <ref k> <ref v>>
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<dictof @key Pattern @value Pattern>
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; {a: b, c: d} ----> <dict {a: <ref b>, c: <ref d>}>
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<dict @entries { any: Pattern ...:... }>
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]>.
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NamedPattern = <named @name symbol @pattern Pattern> / Pattern .
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