Pyodide 対話型 REPL

<!-- FlowDesk：請求コンソール。式を入力するとPythonで集計を即評価 -->
<section class="fd-console" aria-label="FlowDesk 請求コンソール">
  <header class="fd-console__bar">
    <span class="fd-console__brand"><b>Flow</b>Desk</span>
    <nav class="fd-console__crumb">請求 / 集計コンソール</nav>
    <span class="fd-console__chip" id="status" data-state="boot">エンジン起動中…</span>
  </header>

  <div class="fd-console__body">
    <!-- 左：使えるメトリクス一覧 -->
    <aside class="fd-vars">
      <p class="fd-vars__h">利用可能な変数</p>
      <ul class="fd-vars__list">
        <li><code>seats</code><span>席数 42</span></li>
        <li><code>price</code><span>単価 2480</span></li>
        <li><code>months</code><span>契約 12</span></li>
        <li><code>discount</code><span>割引 0.15</span></li>
      </ul>
      <p class="fd-vars__hint">式を入力して Enter で即時集計</p>
    </aside>

    <!-- 右：評価ログ -->
    <div class="fd-eval">
      <div class="fd-eval__screen" id="screen" aria-live="polite">
        <div class="fd-line fd-line--sys">FlowDesk 集計エンジン — Python 式を評価します</div>
      </div>
      <form class="fd-eval__form" id="form" autocomplete="off">
        <span class="fd-eval__prompt">f(x)</span>
        <input class="fd-eval__field" id="field" type="text"
               placeholder="例: seats * price * months" spellcheck="false" disabled
               aria-label="集計式の入力">
        <button class="fd-eval__run" id="run" type="submit" disabled>集計</button>
      </form>
    </div>
  </div>
</section>

/* FlowDesk：請求集計コンソール（REPLを業務UIに） */
:root {
  --navy: #0f1b34;
  --navy2: #16264a;
  --blue: #4f7cff;
  --ink: #cdd6ee;
  --mut: #8a97bd;
  --line: rgba(255, 255, 255, 0.08);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  height: 400px;
  display: grid;
  place-items: center;
  background: radial-gradient(120% 120% at 100% 0%, #16264a, #0f1b34 60%);
  font-family: "Segoe UI", "Hiragino Kaku Gothic ProN", system-ui, sans-serif;
  color: var(--ink);
  overflow: hidden;
}

.fd-console {
  width: min(620px, 94vw);
  height: 356px;
  display: flex;
  flex-direction: column;
  border-radius: 16px;
  background: var(--navy2);
  border: 1px solid var(--line);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
  overflow: hidden;
}

/* 上部バー */
.fd-console__bar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 11px 16px;
  background: rgba(255, 255, 255, 0.03);
  border-bottom: 1px solid var(--line);
  font-size: 12px;
}
.fd-console__brand { font-size: 14px; color: #fff; letter-spacing: 0.02em; }
.fd-console__brand b { color: var(--blue); }
.fd-console__crumb { color: var(--mut); }
.fd-console__chip {
  margin-left: auto;
  padding: 4px 11px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 700;
  background: rgba(79, 124, 255, 0.14);
  color: #9bb4ff;
}
.fd-console__chip[data-state="ready"] { background: rgba(46, 204, 144, 0.16); color: #5fe0a8; }
.fd-console__chip[data-state="err"]   { background: rgba(255, 99, 99, 0.16); color: #ff9b9b; }

.fd-console__body { flex: 1; display: grid; grid-template-columns: 180px 1fr; min-height: 0; }

/* 左サイド：変数一覧 */
.fd-vars {
  padding: 16px 14px;
  border-right: 1px solid var(--line);
  background: rgba(0, 0, 0, 0.12);
}
.fd-vars__h { margin: 0 0 10px; font-size: 11px; letter-spacing: 0.14em; color: var(--mut); }
.fd-vars__list { list-style: none; margin: 0 0 14px; padding: 0; }
.fd-vars__list li {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 7px 0;
  border-bottom: 1px dashed var(--line);
}
.fd-vars__list code { color: #9bb4ff; font-size: 12.5px; }
.fd-vars__list span { font-size: 11px; color: var(--mut); }
.fd-vars__hint { margin: 0; font-size: 10.5px; line-height: 1.6; color: #6f7da6; }

/* 右：評価エリア */
.fd-eval { display: flex; flex-direction: column; min-height: 0; }
.fd-eval__screen {
  flex: 1;
  padding: 14px 16px;
  overflow-y: auto;
  font-family: "Cascadia Code", "Consolas", monospace;
  font-size: 12.5px;
  line-height: 1.7;
}
.fd-eval__screen::-webkit-scrollbar { width: 6px; }
.fd-eval__screen::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 4px; }

.fd-line { white-space: pre-wrap; word-break: break-word; }
.fd-line--sys { color: var(--mut); margin-bottom: 6px; }
.fd-line--in { color: var(--ink); }
.fd-line--in .gt { color: var(--blue); margin-right: 8px; font-weight: 700; }
.fd-line--out { color: #5fe0a8; }
.fd-line--out::before { content: "= "; color: var(--mut); }
.fd-line--err { color: #ff9b9b; }

/* 入力行 */
.fd-eval__form {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  background: rgba(0, 0, 0, 0.18);
}
.fd-eval__prompt {
  font-family: "Cascadia Code", monospace;
  font-size: 12px;
  color: var(--blue);
  font-weight: 700;
}
.fd-eval__field {
  flex: 1;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--line);
  border-radius: 9px;
  padding: 8px 11px;
  color: var(--ink);
  font-family: "Cascadia Code", monospace;
  font-size: 12.5px;
  outline: none;
  transition: border-color 0.2s ease;
}
.fd-eval__field:focus { border-color: var(--blue); }
.fd-eval__field:disabled { opacity: 0.5; }
.fd-eval__run {
  font: inherit;
  font-size: 12.5px;
  font-weight: 700;
  padding: 8px 16px;
  border: none;
  border-radius: 9px;
  cursor: pointer;
  color: #fff;
  background: linear-gradient(135deg, #5f8bff, var(--blue));
}
.fd-eval__run:disabled { opacity: 0.45; cursor: default; }
.fd-eval__run:not(:disabled):active { transform: translateY(1px); }

// 要素取得（null安全）
const $ = (id) => document.getElementById(id);
const screen = $("screen"), field = $("field"), form = $("form"),
      runBtn = $("run"), statusEl = $("status");

if (screen && field && form && runBtn && statusEl) {
  let pyodide = null;

  // 1行を画面に追加するヘルパ
  const append = (text, cls) => {
    const div = document.createElement("div");
    div.className = "fd-line " + cls;
    if (cls === "fd-line--in") {
      const gt = document.createElement("span");
      gt.className = "gt"; gt.textContent = "f(x)";
      div.append(gt, document.createTextNode(text));
    } else {
      div.textContent = text;
    }
    screen.append(div);
    screen.scrollTop = screen.scrollHeight;
  };

  const setStatus = (state, label) => {
    statusEl.dataset.state = state;
    statusEl.textContent = label;
  };

  // ¥表示（数値なら通貨整形）
  const fmt = (v) => {
    const n = Number(v);
    return Number.isFinite(n) && Math.abs(n) >= 100
      ? "¥" + Math.round(n).toLocaleString()
      : String(v);
  };

  // Pyodide読込。請求変数を名前空間に投入
  async function boot() {
    try {
      const mod = await import("https://cdn.jsdelivr.net/pyodide/v0.26.2/full/pyodide.mjs");
      pyodide = await mod.loadPyodide();
      // 集計に使う業務変数を事前定義
      pyodide.runPython("seats=42; price=2480; months=12; discount=0.15");
      setStatus("ready", "集計エンジン: Python");
      field.disabled = runBtn.disabled = false;
      field.focus();
      append("seats=42, price=2480, months=12, discount=0.15 を定義しました", "fd-line--sys");
      // サンプルを1件自動評価して使い方を提示
      evaluate("seats * price * months", true);
    } catch (e) {
      setStatus("err", "オフライン算定");
      append("エンジンに接続できません。式の集計は現在利用できません。", "fd-line--err");
    }
  }

  // 式を評価して結果を表示
  async function evaluate(code, auto) {
    if (!pyodide) return;
    append(code, "fd-line--in");
    setStatus("busy", "集計中…");
    field.disabled = runBtn.disabled = true;
    try {
      const result = await pyodide.runPythonAsync(code);
      if (result !== undefined && result !== null) {
        append(fmt(result), "fd-line--out");
        if (result?.destroy) result.destroy(); // PyProxy解放
      }
    } catch (e) {
      const msg = String(e.message || e).trim().split("\n").pop();
      append(msg, "fd-line--err");
    } finally {
      setStatus("ready", "集計エンジン: Python");
      field.disabled = runBtn.disabled = false;
      if (!auto) field.focus();
    }
  }

  form.addEventListener("submit", (e) => {
    e.preventDefault();
    const code = field.value.trim();
    if (!code || !pyodide) return;
    field.value = "";
    evaluate(code, false);
  });

  boot();
}

<!-- Pyodideでブラウザ上にPython REPLを構築するデモ -->
<main class="repl" role="application" aria-label="Python REPL">
  <header class="repl__bar">
    <span class="repl__dot repl__dot--r"></span>
    <span class="repl__dot repl__dot--y"></span>
    <span class="repl__dot repl__dot--g"></span>
    <span class="repl__title">python &mdash; pyodide</span>
    <span class="repl__status" id="status" data-state="boot">起動中…</span>
  </header>

  <!-- 出力ログ -->
  <div class="repl__screen" id="screen" tabindex="0" aria-live="polite">
    <div class="line line--sys">Pyodide REPL &mdash; <code>print()</code> や式を入力して Enter</div>
  </div>

  <!-- 入力行 -->
  <form class="repl__input" id="form" autocomplete="off">
    <span class="repl__prompt">&gt;&gt;&gt;</span>
    <input class="repl__field" id="field" type="text"
           placeholder="例: sum(range(101))" spellcheck="false" disabled aria-label="Pythonコード入力">
    <button class="repl__run" id="run" type="submit" disabled>実行</button>
  </form>
</main>

/* カラートークン */
:root {
  --bg: #0c1021;
  --panel: #11162e;
  --panel-2: #161d3d;
  --ink: #e7ecff;
  --muted: #8a93c2;
  --accent: #7c9cff;
  --green: #5ee6a8;
  --red: #ff6b81;
  --yellow: #ffd166;
  --radius: 14px;
  --mono: ui-monospace, "SF Mono", "Cascadia Code", "Roboto Mono", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 16px;
  font-family: var(--mono);
  /* 奥行きのある放射状グラデ背景 */
  background:
    radial-gradient(1200px 500px at 15% -10%, #1b2350 0%, transparent 55%),
    radial-gradient(900px 500px at 110% 120%, #20184a 0%, transparent 50%),
    var(--bg);
  color: var(--ink);
}

.repl {
  width: min(100%, 680px);
  height: min(330px, 92vh);
  display: flex;
  flex-direction: column;
  background: linear-gradient(180deg, var(--panel) 0%, var(--panel-2) 100%);
  border: 1px solid #2a335f;
  border-radius: var(--radius);
  box-shadow: 0 24px 60px -20px rgba(0,0,0,.7), inset 0 1px 0 rgba(255,255,255,.05);
  overflow: hidden;
}

/* タイトルバー */
.repl__bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  background: rgba(255,255,255,.03);
  border-bottom: 1px solid #232b52;
}
.repl__dot { width: 11px; height: 11px; border-radius: 50%; }
.repl__dot--r { background: var(--red); }
.repl__dot--y { background: var(--yellow); }
.repl__dot--g { background: var(--green); }
.repl__title {
  margin-left: 6px;
  font-size: 12px;
  color: var(--muted);
  letter-spacing: .04em;
}
.repl__status {
  margin-left: auto;
  font-size: 11px;
  padding: 3px 9px;
  border-radius: 999px;
  border: 1px solid currentColor;
}
.repl__status[data-state="boot"]  { color: var(--yellow); }
.repl__status[data-state="ready"] { color: var(--green); }
.repl__status[data-state="busy"]  { color: var(--accent); }

/* スクリーン */
.repl__screen {
  flex: 1;
  overflow-y: auto;
  padding: 14px 16px;
  font-size: 13px;
  line-height: 1.55;
  scroll-behavior: smooth;
}
.repl__screen:focus-visible { outline: 2px solid var(--accent); outline-offset: -2px; }

.line { white-space: pre-wrap; word-break: break-word; animation: pop .18s ease both; }
.line + .line { margin-top: 2px; }
.line--sys { color: var(--muted); }
.line--in  { color: var(--ink); }
.line--in .gt { color: var(--accent); margin-right: 6px; }
.line--out { color: var(--green); }
.line--err { color: var(--red); }

@keyframes pop { from { opacity: 0; transform: translateY(3px); } to { opacity: 1; transform: none; } }

/* 入力行 */
.repl__input {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-top: 1px solid #232b52;
  background: rgba(0,0,0,.18);
}
.repl__prompt { color: var(--accent); font-weight: 700; }
.repl__field {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--ink);
  font: inherit;
  caret-color: var(--accent);
}
.repl__field::placeholder { color: #5b6498; }
.repl__field:focus { outline: none; }
.repl__field:disabled { opacity: .5; }

.repl__run {
  border: 1px solid var(--accent);
  background: linear-gradient(180deg, #2a3f8f, #1c2b66);
  color: var(--ink);
  font: inherit;
  font-size: 12px;
  padding: 6px 14px;
  border-radius: 8px;
  cursor: pointer;
  transition: transform .12s ease, box-shadow .12s ease;
}
.repl__run:hover:not(:disabled) { transform: translateY(-1px); box-shadow: 0 6px 16px -6px var(--accent); }
.repl__run:active:not(:disabled) { transform: translateY(0); }
.repl__run:disabled { opacity: .45; cursor: not-allowed; }

/* スクロールバー */
.repl__screen::-webkit-scrollbar { width: 8px; }
.repl__screen::-webkit-scrollbar-thumb { background: #2c3568; border-radius: 8px; }

@media (prefers-reduced-motion: reduce) {
  .line { animation: none; }
  .repl__screen { scroll-behavior: auto; }
  .repl__run { transition: none; }
}

// 要素を安全に取得（null時は早期return）
const $ = (id) => document.getElementById(id);
const screen = $("screen"), field = $("field"), form = $("form"),
      runBtn = $("run"), statusEl = $("status");

if (screen && field && form && runBtn && statusEl) {
  let pyodide = null;
  const history = [];        // 入力履歴
  let histIndex = -1;

  // 画面に1行追加するヘルパ
  const append = (text, cls) => {
    const div = document.createElement("div");
    div.className = "line " + cls;
    if (cls === "line--in") {
      const gt = document.createElement("span");
      gt.className = "gt"; gt.textContent = ">>>";
      div.append(gt, document.createTextNode(text));
    } else {
      div.textContent = text;
    }
    screen.append(div);
    screen.scrollTop = screen.scrollHeight;
  };

  const setStatus = (state, label) => {
    statusEl.dataset.state = state;
    statusEl.textContent = label;
  };

  // Pyodideを動的ロード（CDN）
  async function boot() {
    try {
      const mod = await import("https://cdn.jsdelivr.net/pyodide/v0.26.2/full/pyodide.mjs");
      pyodide = await mod.loadPyodide();
      // print出力をJS側へ橋渡し
      pyodide.setStdout({ batched: (s) => append(s, "line--out") });
      pyodide.setStderr({ batched: (s) => append(s, "line--err") });
      setStatus("ready", "準備完了");
      field.disabled = false; runBtn.disabled = false;
      field.focus();
      append("Python " + pyodide.runPython("import sys; sys.version.split()[0]") + " ready.", "line--sys");
    } catch (e) {
      setStatus("boot", "読込失敗");
      append("Pyodideの読み込みに失敗しました: " + e.message, "line--err");
    }
  }

  // 1コマンド評価。式なら値も表示（REPLっぽく）
  async function evaluate(code) {
    append(code, "line--in");
    setStatus("busy", "実行中…");
    field.disabled = runBtn.disabled = true;
    try {
      // runPythonAsyncは最後の式の値を返す（文ならundefined）
      const result = await pyodide.runPythonAsync(code);
      if (result !== undefined && result !== null) {
        append(String(result), "line--out");
        if (result?.destroy) result.destroy(); // PyProxyの解放
      }
    } catch (e) {
      // トレースバックの最終行だけ簡潔に表示
      const msg = String(e.message || e).trim().split("\n").pop();
      append(msg, "line--err");
    } finally {
      setStatus("ready", "準備完了");
      field.disabled = runBtn.disabled = false;
      field.focus();
    }
  }

  form.addEventListener("submit", (e) => {
    e.preventDefault();
    const code = field.value.trim();
    if (!code || !pyodide) return;
    history.push(code); histIndex = history.length;
    field.value = "";
    evaluate(code);
  });

  // ↑↓で履歴ナビゲーション
  field.addEventListener("keydown", (e) => {
    if (e.key === "ArrowUp" && histIndex > 0) {
      histIndex--; field.value = history[histIndex];
      e.preventDefault();
    } else if (e.key === "ArrowDown") {
      if (histIndex < history.length - 1) { histIndex++; field.value = history[histIndex]; }
      else { histIndex = history.length; field.value = ""; }
      e.preventDefault();
    }
  });

  boot();
}