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Name	Size	Last Modified	Actions
[F]index.js Edit	5.50 KB	2022-10-02 10:07:38
[F]topologicalSort.js Edit	1.25 KB	2022-10-02 10:07:40

const PERMANENT_MARKER = 2;
const TEMPORARY_MARKER = 1;

function createError(node, graph) {
  const er = new Error("Nondeterministic import's order");

const related = graph[node];
  const relatedNode = related.find(
    (relatedNode) => graph[relatedNode].indexOf(node) > -1
  );

er.nodes = [node, relatedNode];

return er;
}

function walkGraph(node, graph, state, result, strict) {
  if (state[node] === PERMANENT_MARKER) {
    return;
  }

if (state[node] === TEMPORARY_MARKER) {
    if (strict) {
      return createError(node, graph);
    }

return;
  }

state[node] = TEMPORARY_MARKER;

const children = graph[node];
  const length = children.length;

for (let i = 0; i < length; ++i) {
    const error = walkGraph(children[i], graph, state, result, strict);

if (error instanceof Error) {
      return error;
    }
  }

state[node] = PERMANENT_MARKER;

result.push(node);
}

function topologicalSort(graph, strict) {
  const result = [];
  const state = {};

const nodes = Object.keys(graph);
  const length = nodes.length;

for (let i = 0; i < length; ++i) {
    const er = walkGraph(nodes[i], graph, state, result, strict);

if (er instanceof Error) {
      return er;
    }
  }

return result;
}

module.exports = topologicalSort;

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