index.html

<!doctype html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>WasmBasic</title>

    <link
      rel="stylesheet"
      href="https://cdn.jsdelivr.net/npm/@tabler/icons-webfont@latest/tabler-icons.min.css"
    />

    <style>
      *,
      *::before,
      *::after {
        box-sizing: border-box;
      }
      * {
        margin: 0;
      }

      body {
        font-family: system-ui, sans-serif;
        background: #f5f5f3;
      }

      .ide-root {
        display: grid;
        grid-template-columns: 220px 1fr 1fr;
        height: 100vh;
      }

      .pane {
        display: flex;
        flex-direction: column;
        min-height: 0;
      }

      .pane-header {
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: 10px 16px;
        background: #fff;
        border-bottom: 0.5px solid rgba(0, 0, 0, 0.12);
        flex-shrink: 0;
      }

      .pane-label {
        font-size: 12px;
        color: #888;
        letter-spacing: 0.06em;
        text-transform: uppercase;
        font-weight: 500;
      }

      /* ── Examples ── */
      .examples-pane {
        background: white;
        border-right: 0.5px solid rgba(0, 0, 0, 0.12);
      }
      .examples-list {
        overflow-y: auto;
        padding: 12px;
      }

      .example-card {
        background: #f5f5f3;
        border-radius: 8px;
        padding: 12px;
        cursor: pointer;
        margin-bottom: 8px;
        transition: background 0.15s;
      }
      .example-card:hover {
        background: #e9e9e6;
      }
      .example-card.active {
        background: #ddf0e9;
      }

      .example-title {
        font-size: 13px;
        font-weight: 600;
        color: #222;
      }
      .example-desc {
        margin-top: 4px;
        font-size: 12px;
        color: #777;
        line-height: 1.4;
      }

      /* ── Editor ── */
      .editor-pane {
        border-right: 0.5px solid rgba(0, 0, 0, 0.12);
      }

      .run-btn {
        display: flex;
        align-items: center;
        gap: 6px;
        padding: 6px 14px;
        border-radius: 8px;
        background: #1d9e75;
        border: none;
        color: white;
        font-size: 13px;
        font-weight: 500;
        cursor: pointer;
        transition: background 0.15s;
      }
      .run-btn:hover {
        background: #0f6e56;
      }
      .run-btn:active {
        transform: scale(0.97);
      }

      /* Hand-rolled editor */
      .editor-wrap {
        flex: 1;
        display: flex;
        overflow: hidden;
        background: #1a1a2e;
        position: relative;
      }

      .line-numbers {
        padding: 20px 0;
        width: 44px;
        flex-shrink: 0;
        background: #14142a;
        border-right: 0.5px solid rgba(255, 255, 255, 0.06);
        overflow: hidden;
        user-select: none;
      }

      .line-numbers span {
        display: block;
        text-align: right;
        padding-right: 10px;
        font-size: 13px;
        font-family: "SF Mono", Monaco, Consolas, monospace;
        line-height: 1.7;
        color: #3d4a5c;
      }

      .line-numbers span.active-ln {
        color: #7a8a9a;
      }

      textarea#editor {
        flex: 1;
        border: none;
        outline: none;
        resize: none;
        padding: 20px 20px 20px 16px;
        background: transparent;
        color: #e2e8f0;
        font-family: "SF Mono", Monaco, Consolas, monospace;
        font-size: 13px;
        line-height: 1.7;
        caret-color: #1d9e75;
        overflow-y: auto;
        /* sync scroll with line numbers */
        position: relative;
        z-index: 1;
        tab-size: 4;
        -moz-tab-size: 4;
        white-space: pre;
        overflow-wrap: normal;
        overflow-x: auto;
        spellcheck: false;
      }

      textarea#editor::selection {
        background: rgba(29, 158, 117, 0.28);
      }

      /* ── Status bar ── */
      .status-bar {
        padding: 4px 16px;
        background: #f5f5f3;
        border-top: 0.5px solid rgba(0, 0, 0, 0.1);
        font-size: 11px;
        color: #888;
        flex-shrink: 0;
        display: flex;
        justify-content: space-between;
      }
      .status-bar.ok {
        color: #1d9e75;
      }
      .status-bar.err {
        color: #a32d2d;
      }

      /* ── Output ── */
      .output-pane {
        background: white;
      }

      .output-body {
        flex: 1;
        overflow-y: auto;
        padding: 20px;
        font-family: monospace;
        font-size: 14px;
        line-height: 1.8;
      }

      .output-empty {
        color: #aaa;
        font-size: 13px;
        font-family: system-ui, sans-serif;
      }

      .output-line {
        display: flex;
        gap: 12px;
        padding: 2px 0;
      }
      .output-line .arrow {
        color: #1d9e75;
      }
      .output-line .value {
        color: #1a1a2e;
      }

      .output-error {
        color: #a32d2d;
        background: #fcebeb;
        border-radius: 8px;
        padding: 10px 14px;
        margin-top: 8px;
        font-size: 13px;
      }
    </style>
  </head>

  <body>
    <div class="ide-root">
      <div class="pane examples-pane">
        <div class="pane-header">
          <span class="pane-label">Examples</span>
        </div>
        <div class="examples-list" id="examples"></div>
      </div>

      <div class="pane editor-pane">
        <div class="pane-header">
          <span class="pane-label">Source</span>
          <button class="run-btn" id="run">
            <i class="ti ti-player-play-filled"></i>
            Run
          </button>
        </div>

        <div class="editor-wrap">
          <div class="line-numbers" id="line-numbers"></div>
          <textarea
            id="editor"
            spellcheck="false"
            autocorrect="off"
            autocapitalize="off"
            placeholder="LET A = 10&#10;PRINT A"
          ></textarea>
        </div>

        <div class="status-bar" id="status">
          <span id="status-msg">Ready</span>
          <span id="status-pos">Ln 1, Col 1</span>
        </div>
      </div>

      <div class="pane output-pane">
        <div class="pane-header">
          <span class="pane-label">Output</span>
        </div>
        <div class="output-body" id="output">
          <div class="output-empty">Run your program to see output here.</div>
        </div>
      </div>
    </div>

    <script type="module">
      const EXAMPLES = [
        {
          title: "Hello Numbers",
          desc: "Simple PRINT statements",
          code: "PRINT 1\nPRINT 2\nPRINT 3",
        },
        {
          title: "Variables",
          desc: "LET declarations and arithmetic",
          code: "LET A = 10\nLET B = 20\n\nPRINT A + B",
        },
        {
          title: "If Statement",
          desc: "Conditional execution",
          code: "LET A = 10\n\nIF A > 5 THEN\n    PRINT A\nEND",
        },
        {
          title: "For Loop",
          desc: "Inclusive loop range",
          code: "FOR I = 1 TO 5\n    PRINT I\nEND",
        },
        {
          title: "Sum 1 to 100",
          desc: "Accumulating values in a loop",
          code: "LET TOTAL = 0\n\nFOR I = 1 TO 100\n    TOTAL = TOTAL + I\nEND\n\nPRINT TOTAL",
        },
        {
          title: "Even Numbers",
          desc: "Using the modulo (%) operator",
          code: "FOR I = 1 TO 10\n    IF I % 2 == 0 THEN\n        PRINT I\n    END\nEND",
        },
        {
          title: "Absolute Value",
          desc: "Handling negatives via subtraction",
          code: "LET X = 0 - 42\nLET RESULT = X\n\nIF X < 0 THEN\n    RESULT = 0 - X\nEND\n\nPRINT RESULT",
        },
        {
          title: "Fibonacci Sequence",
          desc: "Generates the first 10 Fibonacci numbers",
          code: "LET A = 0\nLET B = 1\nLET TEMP = 0\n\nFOR I = 1 TO 10\n    PRINT A\n    TEMP = A + B\n    A = B\n    B = TEMP\nEND",
        },
      ];

      const editor = document.getElementById("editor");
      const lnPanel = document.getElementById("line-numbers");
      const statusMsg = document.getElementById("status-msg");
      const statusPos = document.getElementById("status-pos");

      // ── Line numbers ──────────────────────────────────────────────
      function renderLineNumbers() {
        const lines = editor.value.split("\n");
        const totalLines = lines.length;
        const cursorPos = editor.selectionStart;
        const activeLine = editor.value.slice(0, cursorPos).split("\n").length;

        lnPanel.innerHTML = lines
          .map((_, i) => {
            const n = i + 1;
            return `<span class="${n === activeLine ? "active-ln" : ""}">${n}</span>`;
          })
          .join("");
      }

      // Sync line number scroll with textarea scroll
      editor.addEventListener("scroll", () => {
        lnPanel.scrollTop = editor.scrollTop;
      });

      // ── Cursor position ───────────────────────────────────────────
      function updateCursor() {
        const pos = editor.selectionStart;
        const text = editor.value.slice(0, pos);
        const ln = text.split("\n").length;
        const col = text.split("\n").pop().length + 1;
        statusPos.textContent = `Ln ${ln}, Col ${col}`;
        renderLineNumbers();
      }

      editor.addEventListener("keyup", updateCursor);
      editor.addEventListener("click", updateCursor);
      editor.addEventListener("input", updateCursor);
      editor.addEventListener("selectionchange", updateCursor);

      // ── Tab key → 4 spaces ────────────────────────────────────────
      editor.addEventListener("keydown", (e) => {
        if (e.key === "Tab") {
          e.preventDefault();
          const s = editor.selectionStart;
          const v = editor.value;
          editor.value = v.slice(0, s) + "    " + v.slice(editor.selectionEnd);
          editor.selectionStart = editor.selectionEnd = s + 4;
          renderLineNumbers();
        }

        // Ctrl/Cmd+Enter → run
        if ((e.ctrlKey || e.metaKey) && e.key === "Enter") {
          e.preventDefault();
          document.getElementById("run").click();
        }
      });

      // ── Examples sidebar ──────────────────────────────────────────
      const container = document.getElementById("examples");
      const cards = [];

      EXAMPLES.forEach((example, i) => {
        const card = document.createElement("div");
        card.className = "example-card" + (i === 0 ? " active" : "");
        card.innerHTML = `
          <div class="example-title">${example.title}</div>
          <div class="example-desc">${example.desc}</div>
        `;
        card.addEventListener("click", () => {
          editor.value = example.code;
          cards.forEach((c) => c.classList.remove("active"));
          card.classList.add("active");
          editor.focus();
          renderLineNumbers();
          updateCursor();
        });
        container.appendChild(card);
        cards.push(card);
      });

      // ── Init ──────────────────────────────────────────────────────
      editor.value = EXAMPLES[0].code;
      renderLineNumbers();

      // Expose for script.js
      window.getEditorCode = () => editor.value;
      window.setEditorStatus = (msg, type) => {
        statusMsg.textContent = msg;
        const bar = document.getElementById("status");
        bar.className = "status-bar" + (type ? " " + type : "");
      };
    </script>

    <script src="script.js" type="module"></script>
  </body>
</html>