emforth/template.html at main · ntavish/emforth · GitHub

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<!doctype html>
<html>
    <head>
        <title>emForth Web Shell</title>
        <style>
            body {
                font-family: monospace;
                background-color: #1e1e1e;
                color: #d4d4d4;
                display: flex;
                flex-direction: column;
                align-items: center;
                padding: 20px;
            }
            #output {
                width: 80%;
                max-width: 800px;
                height: 400px;
                background-color: #000;
                color: #0f0;
                font-family: monospace;
                white-space: pre;
                border: 1px solid #333;
                overflow-y: scroll;
                padding: 10px;
                box-sizing: border-box;
                resize: vertical;
            }
            #input {
                width: 80%;
                max-width: 800px;
                background-color: #333;
                color: #fff;
                border: 1px solid #555;
                padding: 5px;
                margin-top: 10px;
                box-sizing: border-box;
            }
        </style>
    </head>
    <body>
        <h1>emForth Web Shell</h1>
        <textarea id="output" readonly></textarea>
        <input type="text" id="input" autofocus />
        <script type="text/javascript">
            var inputBuffer = [];
            var encoder = new TextEncoder();

            var Module = {
                print: function (text) {
                    if (arguments.length > 1) {
                        text = Array.prototype.slice.call(arguments).join(" ");
                    }
                    var element = document.getElementById("output");
                    if (element) {
                        element.value += text + "\n";
                        element.scrollTop = element.scrollHeight;
                    }
                },
                printErr: function (text) {
                    if (arguments.length > 1) {
                        text = Array.prototype.slice.call(arguments).join(" ");
                    }
                    console.error(text);
                    var element = document.getElementById("output");
                    if (element) {
                        element.value += "ERR: " + text + "\n";
                        element.scrollTop = element.scrollHeight;
                    }
                },
                stdin: function () {
                    if (inputBuffer.length > 0) {
                        return inputBuffer.shift();
                    }
                    return undefined;
                },
                onRuntimeInitialized: function () {
                    document
                        .getElementById("input")
                        .addEventListener("keydown", function (event) {
                            if (event.key === "Enter") {
                                var line = this.value + "\n";
                                var encoded = encoder.encode(line);

                                // Echo input to console
                                var output = document.getElementById("output");
                                if (output) {
                                    output.value += this.value + "\n";
                                    output.scrollTop = output.scrollHeight;
                                }

                                // Add to input buffer
                                for (var i = 0; i < encoded.length; i++) {
                                    inputBuffer.push(encoded[i]);
                                }

                                this.value = "";
                                this.focus();
                            }
                        });
                },
            };

            var script = document.createElement("script");
            script.src = "./emforth.js";
            script.onload = function () {
                EmforthModule(Module);
            };
            document.body.appendChild(script);
        </script>
    </body>
</html>