angular2/src/change_detection/coalesce.map

Angular 2 - a web framework for modern web apps

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It assuming that record evaluation does not\n * have side-effects.\n *\n * Records that are not last in bindings are removed and all the indices\n * of the records that depend on them are updated.\n *\n * Records that are last in bindings CANNOT be removed, and instead are\n * replaced with very cheap SELF records.\n */\nexport function coalesce(records:List<ProtoRecord>):List<ProtoRecord> {\n  var res = ListWrapper.create();\n  var indexMap = MapWrapper.create();\n\n  for (var i = 0; i < records.length; ++i) {\n    var r = records[i];\n    var record = _replaceIndices(r, res.length + 1, indexMap);\n    var matchingRecord = _findMatching(record, res);\n\n    if (isPresent(matchingRecord) && record.lastInBinding) {\n      ListWrapper.push(res, _selfRecord(record, matchingRecord.selfIndex, res.length + 1));\n      MapWrapper.set(indexMap, r.selfIndex, matchingRecord.selfIndex);\n\n    } else if (isPresent(matchingRecord) && !record.lastInBinding) {\n      MapWrapper.set(indexMap, r.selfIndex, matchingRecord.selfIndex);\n\n    } else {\n      ListWrapper.push(res, record);\n      MapWrapper.set(indexMap, r.selfIndex, record.selfIndex);\n    }\n  }\n\n  return res;\n}\n\nfunction _selfRecord(r:ProtoRecord, contextIndex:number, selfIndex:number):ProtoRecord {\n  return new ProtoRecord(\n    RECORD_TYPE_SELF,\n    \"self\",\n    null,\n    [],\n    r.fixedArgs,\n    contextIndex,\n    selfIndex,\n    r.bindingRecord,\n    r.expressionAsString,\n    r.lastInBinding,\n    r.lastInDirective\n  );\n}\n\nfunction _findMatching(r:ProtoRecord, rs:List<ProtoRecord>){\n  return ListWrapper.find(rs, (rr) =>\n    rr.mode === r.mode &&\n    rr.funcOrValue === r.funcOrValue &&\n    rr.contextIndex === r.contextIndex &&\n    ListWrapper.equals(rr.args, r.args)\n  );\n}\n\nfunction _replaceIndices(r:ProtoRecord, selfIndex:number, indexMap:Map) {\n  var args = ListWrapper.map(r.args, (a) => _map(indexMap, a));\n  var contextIndex = _map(indexMap, r.contextIndex);\n  return new ProtoRecord(\n    r.mode,\n    r.name,\n    r.funcOrValue,\n    args,\n    r.fixedArgs,\n    contextIndex,\n    selfIndex,\n    r.bindingRecord,\n    r.expressionAsString,\n    r.lastInBinding,\n    r.lastInDirective\n  );\n}\n\nfunction _map(indexMap:Map, value:number) {\n  var r = MapWrapper.get(indexMap, value)\n  return isPresent(r) ? r : value;\n}"]}