01Match highlight — locating the typed letters inside each suggestion and bolding that span

<main class="stage">
<div class="hl" id="hl">
  <p class="hl__hint">Finds where your letters appear in each candidate and bolds them.</p>
  <div class="hl__field" role="combobox" aria-expanded="false" aria-owns="hlList" aria-haspopup="listbox" id="hlField">
    <svg class="hl__ic" viewBox="0 0 256 256" aria-hidden="true"><g fill="currentColor"><path d="M192 112a80 80 0 1 1-80-80a80 80 0 0 1 80 80" opacity=".35"/><path d="m229.66 218.34l-50.06-50.06a88.21 88.21 0 1 0-11.32 11.31l50.06 50.07a8 8 0 0 0 11.32-11.32M40 112a72 72 0 1 1 72 72a72.08 72.08 0 0 1-72-72"/></g></svg>
    <input class="hl__input" id="hlInput" type="text" role="searchbox" aria-autocomplete="list" aria-controls="hlList" aria-label="Search fruit" autocomplete="off">
  </div>
  <ul class="hl__list" id="hlList" role="listbox" aria-label="Candidate list"></ul>
  <p class="hl__meta"><b class="hl__tag" id="hlCount">8</b><span class="hl__unit" id="hlUnitText"> total</span></p>
</div>
</main>

@use "../../../../site/static/demo-tokens" as *;

$duration: $dur-quick;
$easing: $ease-out;
$color: $subject-blue-deep;

// 파스텔 강조(도구/파스텔.py to_pastel 결과: 채도 .34 · 명도 +.11, $subject-blue 기준)
$p-blue: #93a4ca;

@include stage($stage-ink);

.hl {
  width: 100%;
  max-width: 400px;
  display: flex;
  flex-direction: column;
  gap: $sp-2;
}

.hl__hint {
  margin: 0;
  padding: 0 $sp-1;
  font-weight: 400;
  font-size: 11px;
  line-height: 1.4;
  color: rgba($subject-cream, .72);
}

.hl__field {
  display: flex;
  align-items: center;
  gap: $sp-2;
  background: $subject-cream;
  border-radius: $r-control;
  padding: $sp-2 $sp-3;
  box-shadow: $shadow-press;
}

.hl__ic {
  width: 16px;
  height: 16px;
  flex: 0 0 auto;
  color: $subject-ink;
}

.hl__input {
  flex: 1 1 auto;
  min-width: 0;
  border: 0;
  outline: 0;
  background: transparent;
  font-weight: 500;
  font-size: 13px;
  line-height: 1.3;
  color: $subject-ink;
  caret-color: $color;
}

.hl__list {
  margin: 0;
  padding: $sp-1;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: $sp-1;
  max-height: 132px;
  overflow-y: auto;
  background: $subject-cream;
  border-radius: $r-card;
  box-shadow: $shadow-press;
}

.hl__item {
  padding: $sp-1 $sp-2;
  border-radius: $r-sm;
  background: transparent;
  color: rgba($subject-ink, .72);
  font-weight: 500;
  font-size: 12px;
  line-height: 1.5;
  transform: scale(1);
  transform-origin: center;
  transition: transform $duration $easing, background-color $duration $easing, color $duration $easing;
}

.hl__item.is-hit {
  background: $color;
  color: $subject-cream;
  transform: scale(1.02);
}

.hl__mark {
  background: $p-blue;
  color: $subject-ink;
  border-radius: $r-xs;
  padding: 0 $sp-1;
}

.hl__meta {
  margin: 0;
  padding: 0 $sp-1;
  display: flex;
  align-items: baseline;
  gap: $sp-1;
}

.hl__tag {
  font-weight: 700;
  font-size: 14px;
  color: $subject-cream;
}

.hl__unit {
  font-weight: 400;
  font-size: 11px;
  color: rgba($subject-cream, .72);
}

@media (max-width: 340px) {
  .hl { max-width: 280px; }
  .hl__item { font-size: 11px; }
  .hl__list { max-height: 70px; }
}

@media (prefers-reduced-motion: reduce) {
  .hl__item {
    transition: none;
  }
}

html, body {
  margin: 0;
  overflow: hidden;
}

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #17141a;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.hl {
  width: 100%;
  max-width: 400px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.hl__hint {
  margin: 0;
  padding: 0 4px;
  font-weight: 400;
  font-size: 11px;
  line-height: 1.4;
  color: rgba(255, 247, 230, 0.72);
}

.hl__field {
  display: flex;
  align-items: center;
  gap: 8px;
  background: #fff7e6;
  border-radius: 12px;
  padding: 8px 12px;
  box-shadow: 0 6px 12px rgba(23, 20, 26, 0.32);
}

.hl__ic {
  width: 16px;
  height: 16px;
  flex: 0 0 auto;
  color: #17141a;
}

.hl__input {
  flex: 1 1 auto;
  min-width: 0;
  border: 0;
  outline: 0;
  background: transparent;
  font-weight: 500;
  font-size: 13px;
  line-height: 1.3;
  color: #17141a;
  caret-color: #0a4fe8;
}

.hl__list {
  margin: 0;
  padding: 4px;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 4px;
  max-height: 132px;
  overflow-y: auto;
  background: #fff7e6;
  border-radius: 16px;
  box-shadow: 0 6px 12px rgba(23, 20, 26, 0.32);
}

.hl__item {
  padding: 4px 8px;
  border-radius: 8px;
  background: transparent;
  color: rgba(23, 20, 26, 0.72);
  font-weight: 500;
  font-size: 12px;
  line-height: 1.5;
  transform: scale(1);
  transform-origin: center;
  transition: transform 220ms ease-out, background-color 220ms ease-out, color 220ms ease-out;
}

.hl__item.is-hit {
  background: #0a4fe8;
  color: #fff7e6;
  transform: scale(1.02);
}

.hl__mark {
  background: #93a4ca;
  color: #17141a;
  border-radius: 4px;
  padding: 0 4px;
}

.hl__meta {
  margin: 0;
  padding: 0 4px;
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.hl__tag {
  font-weight: 700;
  font-size: 14px;
  color: #fff7e6;
}

.hl__unit {
  font-weight: 400;
  font-size: 11px;
  color: rgba(255, 247, 230, 0.72);
}

@media (max-width: 340px) {
  .hl {
    max-width: 280px;
  }
  .hl__item {
    font-size: 11px;
  }
  .hl__list {
    max-height: 70px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .hl__item {
    transition: none;
  }
}

// 일치 하이라이트(01) — 제안 문자열에서 입력어의 첫 일치 위치를 indexOf 로 찾아
// <mark> 로 감싸고, 그 뒤부터 다시 찾아 모든 일치를 강조한다(다중 일치). 비교는
// toLowerCase 로 통일해 대소문자를 무시한다. 자동 시연은 performance.now() 시계로
// 타이핑 시퀀스를 재생한다(CSS @keyframes 없음).
(function () {
  var field = document.getElementById('hlField');
  var input = document.getElementById('hlInput');
  var list = document.getElementById('hlList');
  var countEl = document.getElementById('hlCount');
  var unitEl = document.getElementById('hlUnitText');
  if (!field || !input || !list || !countEl) return;

  var WORDS = ['banana', 'papaya', 'avocado', 'pineapple', 'grapefruit', 'cherry', 'peach', 'watermelon'];

  function escapeHtml(s) {
    return s.replace(/[&<>]/g, function (c) { return c === '&' ? '&amp;' : c === '<' ? '&lt;' : '&gt;'; });
  }

  function highlightAll(text, query) {
    if (!query) return escapeHtml(text);
    var lowerText = text.toLowerCase();
    var lowerQuery = query.toLowerCase();
    var out = '', i = 0;
    while (i < text.length) {
      var idx = lowerText.indexOf(lowerQuery, i);
      if (idx === -1) { out += escapeHtml(text.slice(i)); break; }
      out += escapeHtml(text.slice(i, idx));
      out += '<mark class="hl__mark">' + escapeHtml(text.slice(idx, idx + query.length)) + '</mark>';
      i = idx + query.length;
    }
    return out;
  }

  function render(query) {
    var matched = 0;
    var rows = WORDS.map(function (w) {
      var hit = query && w.toLowerCase().indexOf(query.toLowerCase()) !== -1;
      if (hit) matched++;
      return '<li class="hl__item' + (hit ? ' is-hit' : ' is-dim') + '" role="option">' + highlightAll(w, query) + '</li>';
    });
    list.innerHTML = rows.join('');
    countEl.textContent = String(query ? matched : WORDS.length);
    unitEl.textContent = query ? ' matches' : ' candidates';
    field.setAttribute('aria-expanded', query ? 'true' : 'false');
  }
  render('');

  var reduce = window.matchMedia('(prefers-reduced-motion: reduce)').matches;

  var playing = true;
  function stop() { playing = false; }
  function onUserInput() { stop(); render(input.value); }
  input.addEventListener('input', onUserInput);
  input.addEventListener('keydown', stop);
  input.addEventListener('pointerdown', stop);

  var STEPS = [
    { q: '', ms: 220 },
    { q: 'pa', ms: 360 },
    { q: 'paya', ms: 520 },
    { q: 'paya', ms: 260 },
    { q: '', ms: 220 },
    { q: 'wa', ms: 360 },
    { q: 'watermelon', ms: 520 }
  ];

  if (reduce) {
    input.value = STEPS[2].q;
    render(STEPS[2].q);
  } else {
    var seg = 0, segStart = performance.now();
    (function step(now) {
      if (playing) {
        var elapsed = now - segStart;
        if (elapsed >= STEPS[seg].ms) {
          seg = (seg + 1) % STEPS.length;
          segStart = now;
        }
        var q = STEPS[seg].q;
        if (input.value !== q) { input.value = q; render(q); }
      }
      requestAnimationFrame(step);
    })(segStart);
  }
})();

// SearchAutocompleteHighlightMatch — vanilla 판(run/335/demo/01-search-autocomplete-highlight-match/index.html)
// 의 React 포트. indexOf 로 입력어의 첫 일치 위치를 찾아 <mark> 로 감싸고, 그 뒤부터 다시
// 찾아 모든 일치를 강조한다(다중 일치). 비교는 toLowerCase 로 통일해 대소문자를 무시한다.
// CSS @keyframes 는 없다 — 자동 시연은 performance.now() 시계로 타이핑 시퀀스를 재생한다.
import { useEffect, useRef } from "react";
import styles from "./SearchAutocompleteHighlightMatch.module.scss";

export type SearchAutocompleteHighlightMatchProps = {
  duration?: string;
  easing?: string;
  color?: string;
};

type Box<T> = { current: T };

const HINT = "입력한 글자가 후보 어디에 있는지 찾아 굵게 칠합니다";
const ARIA_LABEL = "과일 검색";
const ARIA_LIST_LABEL = "후보 목록";

const WORDS = ["바나나", "파파야", "아보카도", "파인애플", "자몽", "체리", "복숭아", "수박"];

type Step = { q: string; ms: number };
const STEPS: Step[] = [
  { q: "", ms: 220 },
  { q: "파", ms: 360 },
  { q: "파야", ms: 520 },
  { q: "파야", ms: 260 },
  { q: "", ms: 220 },
  { q: "수", ms: 360 },
  { q: "수박", ms: 520 }
];

function escapeHtml(s: string): string {
  return s.replace(/[&<>]/g, (c) => (c === "&" ? "&amp;" : c === "<" ? "&lt;" : "&gt;"));
}

function highlightAll(text: string, query: string): string {
  if (!query) return escapeHtml(text);
  const lowerText = text.toLowerCase();
  const lowerQuery = query.toLowerCase();
  let out = "";
  let i = 0;
  while (i < text.length) {
    const idx = lowerText.indexOf(lowerQuery, i);
    if (idx === -1) {
      out += escapeHtml(text.slice(i));
      break;
    }
    out += escapeHtml(text.slice(i, idx));
    out += '<mark class="' + styles.mark + '">' + escapeHtml(text.slice(idx, idx + query.length)) + "</mark>";
    i = idx + query.length;
  }
  return out;
}

export default function SearchAutocompleteHighlightMatch({
  duration = "220ms",
  easing = "ease-out",
  color = "#0a4fe8"
}: SearchAutocompleteHighlightMatchProps) {
  const fieldRef = useRef<HTMLDivElement | null>(null);
  const inputRef = useRef<HTMLInputElement | null>(null);
  const listRef = useRef<HTMLUListElement | null>(null);
  const rafRef = useRef(0) as Box<number>;

  useEffect(() => {
    const field = fieldRef.current;
    const input = inputRef.current;
    const list = listRef.current;
    if (!field || !input || !list) return;

    function render(query: string): void {
      const rows = WORDS.map((w) => {
        const hit = query !== "" && w.toLowerCase().indexOf(query.toLowerCase()) !== -1;
        return '<li class="' + styles.item + (hit ? " " + styles.isHit : "") + '" role="option">' + highlightAll(w, query) + "</li>";
      });
      list!.innerHTML = rows.join("");
      field!.setAttribute("aria-expanded", query ? "true" : "false");
    }
    render("");

    const reduce = window.matchMedia("(prefers-reduced-motion: reduce)").matches;

    let playing = true;
    function stop(): void {
      playing = false;
    }
    function onUserInput(): void {
      stop();
      render(input!.value);
    }
    input.addEventListener("input", onUserInput);
    input.addEventListener("keydown", stop);
    input.addEventListener("pointerdown", stop);

    if (reduce) {
      input.value = STEPS[2].q;
      render(STEPS[2].q);
    } else {
      let seg = 0;
      let segStart = performance.now();
      const step = (now: number): void => {
        if (playing) {
          const elapsed = now - segStart;
          if (elapsed >= STEPS[seg].ms) {
            seg = (seg + 1) % STEPS.length;
            segStart = now;
          }
          const q = STEPS[seg].q;
          if (input!.value !== q) {
            input!.value = q;
            render(q);
          }
        }
        rafRef.current = requestAnimationFrame(step);
      };
      rafRef.current = requestAnimationFrame(step);
    }

    return () => {
      cancelAnimationFrame(rafRef.current);
      input.removeEventListener("input", onUserInput);
      input.removeEventListener("keydown", stop);
      input.removeEventListener("pointerdown", stop);
    };
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, []);

  return (
    <main className={styles.stage}>
      <div className={styles.hl}>
        <p className={styles.hint}>{HINT}</p>
        <div
          className={styles.field}
          ref={fieldRef}
          role="combobox"
          aria-expanded="false"
          aria-owns="hlListReact"
          aria-haspopup="listbox"
        >
          <svg className={styles.ic} viewBox="0 0 256 256" aria-hidden="true">
            <g fill="currentColor">
              <path d="M192 112a80 80 0 1 1-80-80a80 80 0 0 1 80 80" opacity=".2" />
              <path d="m229.66 218.34l-50.06-50.06a88.21 88.21 0 1 0-11.32 11.31l50.06 50.07a8 8 0 0 0 11.32-11.32M40 112a72 72 0 1 1 72 72a72.08 72.08 0 0 1-72-72" />
            </g>
          </svg>
          <input
            className={styles.input}
            ref={inputRef}
            type="text"
            role="searchbox"
            aria-autocomplete="list"
            aria-controls="hlListReact"
            aria-label={ARIA_LABEL}
            autoComplete="off"
            style={{ caretColor: color, transitionDuration: duration, transitionTimingFunction: easing }}
          />
        </div>
        <ul className={styles.list} id="hlListReact" ref={listRef} role="listbox" aria-label={ARIA_LIST_LABEL} />
      </div>
    </main>
  );
}