feather/js/index.html at main · materials-commons/feather · GitHub

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<!doctype html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>feather TCL Interpreter</title>
    <style>
      :root {
        --bg: #0a1f10;
        --surface: #0f2e18;
        --primary: #0b5628;
        --accent: #7b8c11;
        --text: #eee;
        --text-dim: #8a9a7a;
        --success: #4a721e;
        --error: #c44536;
      }

      * {
        box-sizing: border-box;
      }

      body {
        margin: 0;
        padding: 20px;
        background: var(--bg);
        color: var(--text);
        font-family:
          system-ui,
          -apple-system,
          sans-serif;
        min-height: 100vh;
      }

      .container {
        max-width: 900px;
        margin: 0 auto;
      }

      h1 {
        margin: 0 0 10px 0;
        color: var(--accent);
        font-size: 2rem;
      }

      .subtitle {
        color: var(--text-dim);
        margin-bottom: 20px;
      }

      .editor-container {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 20px;
        margin-bottom: 20px;
      }

      @media (max-width: 768px) {
        .editor-container {
          grid-template-columns: 1fr;
        }
      }

      .panel {
        background: var(--surface);
        border-radius: 8px;
        overflow: hidden;
      }

      .panel-header {
        background: var(--primary);
        padding: 10px 15px;
        font-weight: 600;
        display: flex;
        justify-content: space-between;
        align-items: center;
      }

      .panel-body {
        padding: 0;
      }

      textarea {
        width: 100%;
        height: 300px;
        background: var(--surface);
        color: var(--text);
        border: none;
        padding: 15px;
        font-family: "JetBrains Mono", "Fira Code", monospace;
        font-size: 14px;
        resize: vertical;
        outline: none;
      }

      textarea::placeholder {
        color: var(--text-dim);
      }

      .output {
        padding: 15px;
        font-family: "JetBrains Mono", "Fira Code", monospace;
        font-size: 14px;
        min-height: 300px;
        max-height: 400px;
        overflow-y: auto;
        white-space: pre-wrap;
        word-break: break-all;
      }

      .output-line {
        margin: 2px 0;
      }

      .output-line.error {
        color: var(--error);
      }

      .output-line.result {
        color: var(--success);
      }

      .output-line.info {
        color: var(--text-dim);
      }

      .canvas-panel {
        margin-top: 20px;
      }

      .canvas-panel canvas {
        width: 100%;
        height: 300px;
        background: #111;
        border-radius: 0 0 8px 8px;
      }

      .controls {
        display: flex;
        gap: 10px;
        margin-bottom: 20px;
      }

      button {
        background: var(--accent);
        color: white;
        border: none;
        padding: 10px 20px;
        border-radius: 6px;
        font-size: 14px;
        font-weight: 600;
        cursor: pointer;
        transition: opacity 0.2s;
      }

      button:hover {
        opacity: 0.9;
      }

      button:disabled {
        opacity: 0.5;
        cursor: not-allowed;
      }

      button.secondary {
        background: var(--primary);
      }

      .examples {
        margin-top: 20px;
      }

      .examples h3 {
        margin: 0 0 10px 0;
        color: var(--text-dim);
        font-size: 14px;
        text-transform: uppercase;
        letter-spacing: 1px;
      }

      .example-buttons {
        display: flex;
        flex-wrap: wrap;
        gap: 8px;
      }

      .example-btn {
        background: var(--primary);
        padding: 6px 12px;
        font-size: 12px;
      }

      .status {
        display: flex;
        align-items: center;
        gap: 8px;
        font-size: 12px;
      }

      .status-dot {
        width: 8px;
        height: 8px;
        border-radius: 50%;
        background: var(--text-dim);
      }

      .status-dot.ready {
        background: var(--success);
      }

      .status-dot.loading {
        background: var(--accent);
        animation: pulse 1s infinite;
      }

      @keyframes pulse {
        0%,
        100% {
          opacity: 1;
        }
        50% {
          opacity: 0.5;
        }
      }
    </style>
  </head>
  <body>
    <div class="container">
      <h1>
        <img
          src="/logo.png"
          alt="feather"
          style="height: 1.5em; vertical-align: middle; margin-right: 8px"
        />feather
      </h1>
      <p class="subtitle">
        A lightweight TCL interpreter compiled to WebAssembly
      </p>

      <div class="controls">
        <button id="runBtn" disabled>▶ Run</button>
        <button id="clearBtn" class="secondary">Clear Output</button>
        <div class="status">
          <div class="status-dot" id="statusDot"></div>
          <span id="statusText">Loading...</span>
        </div>
      </div>

      <div class="editor-container">
        <div class="panel">
          <div class="panel-header">Script</div>
          <div class="panel-body">
            <textarea id="editor" placeholder="Enter TCL code here...">
# Welcome to feather!
# Try some TCL commands:

set greeting "Hello, World!"
puts $greeting

proc factorial {n} {
    if {$n <= 1} {
        return 1
    }
    expr {$n * [factorial [expr {$n - 1}]]}
}

puts "5! = [factorial 5]"

foreach fruit {apple banana cherry} {
    puts "I like $fruit"
}
</textarea
            >
          </div>
        </div>

        <div class="panel">
          <div class="panel-header">Output</div>
          <div class="panel-body">
            <div class="output" id="output"></div>
          </div>
        </div>
      </div>

      <div class="examples">
        <h3>Examples</h3>
        <div class="example-buttons">
          <button class="example-btn" data-example="hello">Hello World</button>
          <button class="example-btn" data-example="math">Math</button>
          <button class="example-btn" data-example="lists">Lists</button>
          <button class="example-btn" data-example="procs">Procedures</button>
          <button class="example-btn" data-example="loops">Loops</button>
          <button class="example-btn" data-example="dict">Dictionaries</button>
          <button class="example-btn" data-example="canvas">Canvas</button>
        </div>
      </div>

      <div class="panel canvas-panel">
        <div class="panel-header">Canvas</div>
        <div class="panel-body">
          <canvas id="canvas" width="800" height="300"></canvas>
        </div>
      </div>
    </div>

    <script type="module">
      import { createFeather } from "./feather.js";

      const examples = {
        hello: `puts "Hello, World!"
set name "feather"
puts "Welcome to $name!"`,

        math: `# Basic arithmetic
puts [expr {2 + 3 * 4}]
puts [expr {(2 + 3) * 4}]

# Variables in expressions
set x 10
set y 5
puts "$x + $y = [expr {$x + $y}]"
puts "$x * $y = [expr {$x * $y}]"

# Comparisons
puts "10 > 5? [expr {10 > 5}]"
puts "10 == 10? [expr {10 == 10}]"`,

        lists: `# Create a list
set colors {red green blue}
puts "Colors: $colors"
puts "Length: [llength $colors]"

# Access elements
puts "First: [lindex $colors 0]"
puts "Last: [lindex $colors end]"

# Modify lists
lappend colors yellow
puts "After append: $colors"

# List operations
set nums {3 1 4 1 5 9 2 6}
puts "Sorted: [lsort $nums]"
puts "Range: [lrange $nums 2 5]"`,

        procs: `# Define a procedure
proc greet {name} {
    return "Hello, $name!"
}
puts [greet "World"]

# Procedure with default argument
proc add {a {b 10}} {
    expr {$a + $b}
}
puts "add 5: [add 5]"
puts "add 5 3: [add 5 3]"

# Recursive procedure
proc fib {n} {
    if {$n <= 1} {
        return $n
    }
    expr {[fib [expr {$n-1}]] + [fib [expr {$n-2}]]}
}
puts "fib(10) = [fib 10]"`,

        loops: `# foreach loop
foreach item {a b c d e} {
    puts "Item: $item"
}

# for loop
for {set i 0} {$i < 5} {incr i} {
    puts "i = $i"
}

# while loop
set count 3
while {$count > 0} {
    puts "Countdown: $count"
    incr count -1
}
puts "Blast off!"`,

        dict: `# Create a dictionary
set person [dict create name "Alice" age 30 city "NYC"]
puts "Person: $person"

# Access values
puts "Name: [dict get $person name]"
puts "Age: [dict get $person age]"

# Modify dictionary
dict set person job "Engineer"
puts "Updated: $person"

# Check existence
puts "Has name? [dict exists $person name]"
puts "Has salary? [dict exists $person salary]"

# Get all keys
puts "Keys: [dict keys $person]"`,

        canvas: `# Canvas drawing demo
canvas clear

# Draw some rectangles
canvas fill #e94560
canvas rect 50 50 100 80
canvas fill #4ade80
canvas rect 200 100 120 60

# Draw circles
canvas fill #60a5fa
canvas circle 450 100 50
canvas fill #fbbf24
canvas circle 550 180 30

# Draw lines
canvas stroke #fff
canvas width 2
canvas line 50 200 200 250
canvas line 200 250 350 200

# Draw a polygon (triangle)
canvas fill #a78bfa
canvas polygon 600 50 700 150 500 150

# Add some text
canvas fill #fff
canvas font "16px sans-serif"
canvas text 50 280 "Hello from feather!"

puts "Canvas demo complete!"`,
      };

      const editor = document.getElementById("editor");
      const output = document.getElementById("output");
      const runBtn = document.getElementById("runBtn");
      const clearBtn = document.getElementById("clearBtn");
      const statusDot = document.getElementById("statusDot");
      const statusText = document.getElementById("statusText");

      let feather, interp;

      function log(text, type = "") {
        const line = document.createElement("div");
        line.className = `output-line ${type}`;
        line.textContent = text;
        output.appendChild(line);
        output.scrollTop = output.scrollHeight;
      }

      async function init() {
        statusDot.className = "status-dot loading";
        statusText.textContent = "Loading WASM...";

        try {
          feather = await createFeather("./feather.wasm");
          interp = feather.create();

          feather.register(interp, "puts", (args) => {
            log(args.join(" "));
            return "";
          });

          feather.register(interp, "clock", (args) => {
            if (args[0] === "seconds") return Math.floor(Date.now() / 1000);
            if (args[0] === "milliseconds") return Date.now();
            throw new Error(`unknown clock subcommand "${args[0]}"`);
          });

          // Canvas command with drawing subcommands
          const canvas = document.getElementById("canvas");
          const ctx = canvas.getContext("2d");
          let fillColor = "#fff";
          let strokeColor = "#fff";
          let lineWidth = 1;

          feather.register(interp, "canvas", (args) => {
            const sub = args[0];
            switch (sub) {
              case "clear":
                ctx.clearRect(0, 0, canvas.width, canvas.height);
                break;
              case "fill":
                fillColor = args[1];
                ctx.fillStyle = fillColor;
                break;
              case "stroke":
                strokeColor = args[1];
                ctx.strokeStyle = strokeColor;
                break;
              case "width":
                lineWidth = parseFloat(args[1]);
                ctx.lineWidth = lineWidth;
                break;
              case "rect":
                ctx.fillRect(
                  parseFloat(args[1]),
                  parseFloat(args[2]),
                  parseFloat(args[3]),
                  parseFloat(args[4]),
                );
                break;
              case "strokerect":
                ctx.strokeRect(
                  parseFloat(args[1]),
                  parseFloat(args[2]),
                  parseFloat(args[3]),
                  parseFloat(args[4]),
                );
                break;
              case "circle":
                ctx.beginPath();
                ctx.arc(
                  parseFloat(args[1]),
                  parseFloat(args[2]),
                  parseFloat(args[3]),
                  0,
                  Math.PI * 2,
                );
                ctx.fill();
                break;
              case "strokecircle":
                ctx.beginPath();
                ctx.arc(
                  parseFloat(args[1]),
                  parseFloat(args[2]),
                  parseFloat(args[3]),
                  0,
                  Math.PI * 2,
                );
                ctx.stroke();
                break;
              case "line":
                ctx.beginPath();
                ctx.moveTo(parseFloat(args[1]), parseFloat(args[2]));
                ctx.lineTo(parseFloat(args[3]), parseFloat(args[4]));
                ctx.stroke();
                break;
              case "polygon": {
                const points = args.slice(1).map(parseFloat);
                if (points.length >= 4) {
                  ctx.beginPath();
                  ctx.moveTo(points[0], points[1]);
                  for (let i = 2; i < points.length; i += 2) {
                    ctx.lineTo(points[i], points[i + 1]);
                  }
                  ctx.closePath();
                  ctx.fill();
                }
                break;
              }
              case "strokepolygon": {
                const points = args.slice(1).map(parseFloat);
                if (points.length >= 4) {
                  ctx.beginPath();
                  ctx.moveTo(points[0], points[1]);
                  for (let i = 2; i < points.length; i += 2) {
                    ctx.lineTo(points[i], points[i + 1]);
                  }
                  ctx.closePath();
                  ctx.stroke();
                }
                break;
              }
              case "font":
                ctx.font = args[1];
                break;
              case "text":
                ctx.fillText(
                  args.slice(3).join(" "),
                  parseFloat(args[1]),
                  parseFloat(args[2]),
                );
                break;
              case "arc":
                ctx.beginPath();
                ctx.arc(
                  parseFloat(args[1]),
                  parseFloat(args[2]),
                  parseFloat(args[3]),
                  parseFloat(args[4]),
                  parseFloat(args[5]),
                );
                ctx.stroke();
                break;
              default:
                throw new Error(`unknown canvas subcommand "${sub}"`);
            }
            return "";
          });

          statusDot.className = "status-dot ready";
          statusText.textContent = "Ready";
          runBtn.disabled = false;

          log("feather interpreter ready", "info");
        } catch (e) {
          statusDot.className = "status-dot";
          statusText.textContent = "Failed to load";
          log(`Failed to load WASM: ${e.message}`, "error");
          console.error(e);
        }
      }

      runBtn.addEventListener("click", () => {
        const script = editor.value;
        if (!script.trim()) return;

        log("", "info");
        log("--- Running script ---", "info");

        try {
          const result = feather.eval(interp, script);
          if (result) {
            log(`=> ${result}`, "result");
          }
        } catch (e) {
          log(`Error: ${e.message}`, "error");
        }
      });

      clearBtn.addEventListener("click", () => {
        output.innerHTML = "";
      });

      editor.addEventListener("keydown", (e) => {
        if ((e.ctrlKey || e.metaKey) && e.key === "Enter") {
          e.preventDefault();
          runBtn.click();
        }
      });

      document.querySelectorAll(".example-btn").forEach((btn) => {
        btn.addEventListener("click", () => {
          const example = examples[btn.dataset.example];
          if (example) {
            editor.value = example;
          }
        });
      });

      init();
    </script>
  </body>
</html>