prism-code-editor/dist/extensions/matchBrackets/highlight.js

Lightweight, extensible code editor component for the web using Prism

import { a as addTextareaListener, n as getClosestToken } from "../../index-CxiLA9IO.js";
const highlightBracketPairs = () => (editor) => {
  let prev;
  let els = [];
  let selectionChange = () => {
    let matcher = editor.extensions.matchBrackets;
    let [start, end] = editor.getSelection();
    if (matcher) {
      let brackets = matcher.brackets;
      let pairs = matcher.pairs;
      let opening;
      let closing;
      if (editor.focused && start == end) {
        for (let i = 0, bracket; bracket = brackets[++i]; ) {
          if (!bracket[5] && bracket[2] >= end && brackets[pairs[i]]?.[1] <= end) {
            opening = brackets[pairs[i]];
            closing = bracket;
            break;
          }
        }
      }
      if (closing != prev) {
        toggleActive();
        if (closing) {
          els = [opening, closing].map(
            (bracket) => getClosestToken(editor, ".punctuation", 0, -1, bracket[1])
          );
          if (els[0] != els[1] && opening[2] == closing[1]) {
            els[0].textContent += els[1].textContent;
            els[1].textContent = "";
            els[1] = els[0];
          }
          toggleActive(true);
        } else els = [];
      }
      prev = closing;
    }
  };
  let toggleActive = (add) => els.forEach((el) => el.classList.toggle("active-bracket", !!add));
  addTextareaListener(editor, "focus", selectionChange);
  addTextareaListener(editor, "blur", selectionChange);
  editor.on("selectionChange", selectionChange);
};
export {
  highlightBracketPairs
};
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