Function findOperator

packages/sheet/src/sheet.ts:23–68

(operator: string, selector: string, from: number)

  value.replace(/\s+/g, " ").trim();

function findOperator(operator: string, selector: string, from: number) {
  const start = selector.indexOf(operator, from);

  if (start < 0) {
    return null;
  }

  let index = start + operator.length;

  while (whitespaceRegex.test(selector[index] ?? "")) {
    index += 1;
  }

  const unmatchedOrMissingParenthesis: OperatorMatch = {
    start,
    end: index,
    value: undefined,
  };

  if (selector[index] !== "(") {
    return unmatchedOrMissingParenthesis;
  }

  let depth = 1;
  let cursor = index + 1;

  while (cursor < selector.length && depth > 0) {
    if (selector[cursor] === "(") {
      depth += 1;
    } else if (selector[cursor] === ")") {
      depth -= 1;
    }

    cursor += 1;
  }

  if (depth !== 0) {
    return unmatchedOrMissingParenthesis;
  }

  return {
    start,
    end: cursor,
    value: selector.slice(index + 1, cursor - 1),
  };
}

function extractOperators(operator: string, style: string) {
  const selectors: string[] = [];