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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,64 @@ | ||
import {parse} from 'csv-parse'; | ||
import fs from 'fs'; | ||
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const parser = parse(); | ||
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const adjacencyList: Record<string, string[]> = {}; | ||
const visited: Map<string, boolean> = new Map<string, boolean>(); | ||
const backEdges: Map<string, boolean> = new Map<string, boolean>(); | ||
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function addEdge(source: string, target: string) { | ||
if (!adjacencyList[source]) { | ||
adjacencyList[source] = []; | ||
} | ||
adjacencyList[source].push(target); | ||
} | ||
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function isCyclic(currentNode: string): boolean { | ||
visited.set(currentNode, true); | ||
backEdges.set(currentNode, true); | ||
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// Do a depth first search for all the neighbours. If a node is found in backedge, a cycle is detected. | ||
const neighbours = adjacencyList[currentNode]; | ||
if (neighbours) { | ||
for (const node of neighbours) { | ||
if (!visited.has(node)) { | ||
if (isCyclic(node)) { | ||
return true; | ||
} | ||
} else if (backEdges.has(node)) { | ||
return true; | ||
} | ||
} | ||
} | ||
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backEdges.delete(currentNode); | ||
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return false; | ||
} | ||
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function detectCycle(): boolean { | ||
for (const [node] of Object.entries(adjacencyList)) { | ||
if (!visited.has(node)) { | ||
if (isCyclic(node)) { | ||
const cycle = Array.from(backEdges.keys()); | ||
console.log(`Infinite redirect found in the cycle: ${cycle.join(' -> ')} -> ${node}`); | ||
return true; | ||
} | ||
} | ||
} | ||
return false; | ||
} | ||
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fs.createReadStream(`${process.cwd()}/docs/redirects.csv`) | ||
.pipe(parser) | ||
.on('data', (row) => { | ||
// Create a directed graph of sourceURL -> targetURL | ||
addEdge(row[0], row[1]); | ||
}) | ||
.on('end', () => { | ||
if (detectCycle()) { | ||
process.exit(1); | ||
} | ||
process.exit(0); | ||
}); |
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