sdnext/javascript/promptChecker.js

// Stable Diffusion WebUI - Bracket checker
// By Hingashi no Florin/Bwin4L & @akx
// Counts open and closed brackets (round, square, curly) in the prompt and negative prompt text boxes in the txt2img and img2img tabs.
// If there's a mismatch, the keyword counter turns red and if you hover on it, a tooltip tells you what's wrong.

function checkBrackets(textArea, counterElt) {
  const counts = {};
  const errors = [];

  function checkPair(open, close, kind) {
    if (counts[open] !== counts[close]) errors.push(`${open}...${close} - Detected ${counts[open] || 0} opening and ${counts[close] || 0} closing ${kind}.`);
  }

  (textArea.value.match(/[(){}[\]]/g) || []).forEach((bracket) => { counts[bracket] = (counts[bracket] || 0) + 1; });
  checkPair('(', ')', 'round brackets');
  checkPair('[', ']', 'square brackets');
  checkPair('{', '}', 'curly brackets');
  counterElt.title = errors.join('\n');
  counterElt.classList.toggle('error', errors.length !== 0);
}

function setupBracketChecking(idPrompt, idCounter) {
  const textarea = gradioApp().querySelector(`#${idPrompt} > label > textarea`);
  const counter = gradioApp().getElementById(idCounter);
  if (!textarea || !counter) return;
  textarea.addEventListener('input', () => checkBrackets(textarea, counter));
}

async function initPromptChecker() {
  log('initPromptChecker');
  setupBracketChecking('txt2img_prompt', 'txt2img_token_counter');
  setupBracketChecking('txt2img_neg_prompt', 'txt2img_negative_token_counter');
  setupBracketChecking('img2img_prompt', 'img2img_token_counter');
  setupBracketChecking('img2img_neg_prompt', 'img2img_negative_token_counter');
  setupBracketChecking('control_prompt', 'control_token_counter');
  setupBracketChecking('control_neg_prompt', 'control_negative_token_counter');
  setupBracketChecking('video_prompt', 'video_token_counter');
  setupBracketChecking('video_neg_prompt', 'video_negative_token_counter');
}