AtCoderStrangeIHighlighter

AtCoderの制約において、範囲定義ではない i を強調します

You will need to install an extension such as Tampermonkey, Greasemonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey to install this script.

You will need to install an extension such as Tampermonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Userscripts to install this script.

You will need to install an extension such as Tampermonkey to install this script.

You will need to install a user script manager extension to install this script.

(У мене вже є менеджер скриптів, дайте мені встановити його!)

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

(I already have a user style manager, let me install it!)

// ==UserScript==
// @name         AtCoderStrangeIHighlighter
// @namespace    https://github.com/asakuchi
// @version      1.0
// @description  AtCoderの制約において、範囲定義ではない i を強調します
// @author       asakuchi
// @match        https://atcoder.jp/contests/*/tasks/*
// @license      MIT
// @grant        none
// ==/UserScript==

(function () {
  "use strict";

  const STYLE_IMPORTANT_I = {
    color: "#ff0080",
    fontWeight: "bold",
    fontSize: "1.25em",
  };

  function applyStyles(element, styles) {
    for (const [key, value] of Object.entries(styles)) {
      element.style[key] = value;
    }
  }

  function isRelation(node) {
    if (!node) return false;
    if (node.classList.contains("mrel")) return true;

    const text = node.textContent.trim();
    return [
      "<",
      ">",
      "≤",
      "≥",
      "≦",
      "≧",
      "=",
      "≠",
      "≡",
      "≪",
      "≫",
      "\\le",
      "\\ge",
    ].includes(text);
  }

  function highlightContextual() {
    const headers = Array.from(document.querySelectorAll("h3")).filter(
      (h) =>
        h.textContent.includes("制約") || h.textContent.includes("Constraints"),
    );

    headers.forEach((h3) => {
      const section = h3.parentElement;
      if (!section) return;

      const listItems = section.querySelectorAll("li");
      listItems.forEach((li) => {
        const katexHtml = li.querySelector(".katex-html");
        if (!katexHtml) return;

        const allNodes = Array.from(katexHtml.querySelectorAll("*"));

        const leafNodes = allNodes.filter((node) => {
          if (!node.textContent.trim()) return false;
          if (
            node.classList.contains("strut") ||
            node.classList.contains("mspace")
          )
            return false;

          return node.children.length === 0;
        });

        leafNodes.forEach((node, index) => {
          const text = node.textContent.trim();

          if (
            text === "i" &&
            (node.classList.contains("mathnormal") ||
              node.closest(".mathnormal")) &&
            !node.closest(".vlist-t")
          ) {
            const prev = leafNodes[index - 1];
            const next = leafNodes[index + 1];

            const isSandwiched = isRelation(prev) && isRelation(next);

            if (!isSandwiched) {
              if (!node.dataset.highlighted) {
                applyStyles(node, STYLE_IMPORTANT_I);
                node.dataset.highlighted = "true";
              }
            }
          }
        });
      });
    });
  }

  window.addEventListener("load", highlightContextual);

  setInterval(highlightContextual, 500);
})();