Method propose

src/runtime/join.ts:275–283

(tripleIndex, prefix)

  // Return a proposal or nothing based on the currently solved prefix of variables.
  propose(tripleIndex, prefix) : Proposal | undefined {
    let resolved = this.resolve(prefix);
    let [e,a,v,node] = resolved;
    // if this scan is fully resolved, then there's no variable for us to propose
    if(e !== undefined && a !== undefined && v !== undefined && (node !== undefined || this.node === undefined)) {
      return;
    }
    return this.getProposal(tripleIndex, resolved);
  }

  // Given a proposal, get the values for that proposal. There are two proposal types
  // for scans purely because of the way we wrote our indexes. Because JS will turn all