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support catting subpatterns, fixes #87

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alex 2022-04-23 09:38:05 +01:00
parent f4dd549a41
commit 9df20fcbc5
2 changed files with 10 additions and 1 deletions
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5
packages/core/pattern.mjs
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@ -837,7 +837,10 @@ export function stack(...pats) {
export function slowcat(...pats) {
// Concatenation: combines a list of patterns, switching between them
// successively, one per cycle.
pats = pats.map(reify);
// Array test here is to avoid infinite recursions..
pats = pats.map(pat => Array.isArray(pat) ? sequence(...pat) : reify(pat));
const query = function (state) {
const span = state.span;
const pat_n = mod(span.begin.sam(), pats.length);