const lineSplitRE = /\r?\n/;
function positionToOffset(source, lineNumber, columnNumber) {
  const lines = source.split(lineSplitRE);
  const nl = /\r\n/.test(source) ? 2 : 1;
  let start = 0;
  if (lineNumber > lines.length) {
    return source.length;
  }
  for (let i = 0; i < lineNumber - 1; i++) {
    start += lines[i].length + nl;
  }
  return start + columnNumber;
}
function offsetToLineNumber(source, offset) {
  if (offset > source.length) {
    throw new Error(`offset is longer than source length! offset ${offset} > length ${source.length}`);
  }
  const lines = source.split(lineSplitRE);
  const nl = /\r\n/.test(source) ? 2 : 1;
  let counted = 0;
  let line = 0;
  for (; line < lines.length; line++) {
    const lineLength = lines[line].length + nl;
    if (counted + lineLength >= offset) {
      break;
    }
    counted += lineLength;
  }
  return line + 1;
}
export {
  lineSplitRE,
  offsetToLineNumber,
  positionToOffset
};
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