Function dedentMarkup

packages/jest-snapshot/src/dedentLines.ts:80–123

(input: Array<string>, output: Array<string>)

// * text has more than one adjacent line
// * markup does not close
const dedentMarkup = (input: Array<string>, output: Array<string>): boolean => {
  let line = input[output.length];

  if (!dedentStartTag(input, output)) {
    return false;
  }

  if (input[output.length - 1].includes('/>')) {
    return true;
  }

  let isText = false;
  const stack = [getIndentationLength(line)];

  while (stack.length > 0 && output.length < input.length) {
    line = input[output.length];

    if (isFirstLineOfTag(line)) {
      if (line.includes('</')) {
        output.push(dedentLine(line));
        stack.pop();
      } else {
        if (!dedentStartTag(input, output)) {
          return false;
        }

        if (!input[output.length - 1].includes('/>')) {
          stack.push(getIndentationLength(line));
        }
      }
      isText = false;
    } else {
      if (isText) {
        return false; // because text has more than one adjacent line
      }

      const indentationLengthOfTag = stack.at(-1)!;
      output.push(line.slice(indentationLengthOfTag + 2));
      isText = true;
    }
  }

  return stack.length === 0;
};

// Return lines unindented by heuristic;
// otherwise return null because: