position to line/column

pos-to-line.js

function posToLine(template, pos) {
  const lines = template.split("\n");
  let run = 0;
  let x;
  for (x = 0; x < lines.length; x++) {
    const line = lines[x];
    if (run + line.length < pos) {
      run += line.length + 1;
    } else {
      break;
    }
  }

  const line = x + 1;
  const col = pos - run;

  return { line, col };
}


console.log(
  posToLine(
    `abc
12345
hello world
foo bar`,
    12
  )
);