syndicate-lang
/
syndicate-js
1
0
Fork 0
Code Issues 1 Pull Requests Projects Releases Wiki Activity

Experimental "flattening" of during

This commit is contained in:
Tony Garnock-Jones 2019-06-21 13:53:56 +01:00
parent 1806080793
commit c4ce36ca1d
1 changed files with 33 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

41
packages/syntax/src/plugin.js
View File

@ -547,15 +547,40 @@ export default declare((api, options) => {
INSTID: instId,
}));
} else {
// TODO: this is a hopefully-temporary performance hack. Ideally we'd expand to
// something like we had earlier, namely
//
// on asserted PATTERN1 react {
// stop on retracted :snapshot PATTERN2
// BODY
// }
//
// but for now, in order to avoid subscription churn, we use PATTERN1's retracted
// events to manage the lifetimes of the nested react.
const info = compilePattern(state, path.get('pattern'));
path.replaceWith(syndicateTemplate(
`on asserted PATTERN1 react {
stop on retracted :snapshot PATTERN2;
BODY
}`)({
PATTERN1: node.pattern,
PATTERN2: instantiatePatternToPattern(state, path.get('pattern')),
BODY: node.body,
}));
`{
let FACETS = SYNDICATE.Map();
on asserted PATTERN react {
FACETS = FACETS.set(KEY, DATASPACE._currentFacet);
dataflow void 0; // TODO: horrible hack to keep the facet alive if no other endpoints
BODY
}
on retracted PATTERN {
let KEYID = KEY;
FACETS.get(KEYID).stop();
FACETS = FACETS.remove(KEYID);
}
}`)({
FACETS: path.scope.generateUidIdentifier("facets"),
SYNDICATE: state.SyndicateID,
PATTERN: node.pattern,
KEY: listAst(state, t.arrayExpression(info.captureIds)),
DATASPACE: state.DataspaceID,
BODY: node.body,
KEYID: path.scope.generateUidIdentifier("key"),
}));
}
path.parentPath.traverse(bindingRegistrationVisitor, state);
},