steve-taylor/lua-editor.html

## lua-editor.html
<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <meta http-equiv="content-type" content="text/html; charset=UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1">
        <title>Lua editor with Syntax highlighting</title>
        <script src="https://cdnjs.cloudflare.com/ajax/libs/babel-standalone/6.26.0/babel.min.js"></script>
        <script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.2.0/umd/react.production.min.js"></script>
        <script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.2.0/umd/react-dom.production.min.js"></script>
        <script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/highlight.min.js"></script>
        <script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/languages/lua.min.js"></script>
        <link rel="stylesheet" type="text/css" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/solarized-dark.min.css">

        <style>
            .editor__input-area {
                position: absolute;
                top: 0;
                left: 0;
                outline: 0;
                margin: 0;
                border: 0;
                border-radius: 0;
                padding: 0;
                width: 100%;
                height: 100%;
                font-family: monospace;
                font-size: 24px;
                color: #fff;
                -webkit-text-fill-color: transparent;
                white-space: nowrap;
                overflow: auto;
                background-color: #002b36;
            }

            .editor__output-area {
                position: absolute;
                overflow: hidden;
                top: 0;
                left: 0;
                width: 100%;
                height: 100%;
                pointer-events: none;
            }

            .editor__output-area-wrapper {
                position: absolute;
                left: 0;
                width: 100%;
                height: 100%;
                margin: 0;
                padding: 0;
            }

            .editor__output-area-body {
                position: absolute;
                top: 0;
                left: 0;
                width: 100%;
                height: 100%;
                margin: 0;
                padding: 0;
                font-size: 24px;
                background: transparent;
                overflow: visible;
            }
        </style>
    </head>
    <script type="text/babel" data-presets="es2017,react">
        hljs.initHighlightingOnLoad();

        class Editor extends React.PureComponent {
            state = {
                text: '',
                scrollTop: 0,
                scrollLeft: 0,
            };

            highlight = () => {
                if (this.codeElement) {
                    hljs.highlightBlock(this.codeElement);
                }
            };

            onChangeText = ({target}) => {
                this.setState({text: target.value}, this.highlight);
            };

            onScroll = ({target}) => {
                this.setState({
                    scrollTop: target.scrollTop,
                    scrollLeft: target.scrollLeft,
                });
            };

            setCodeElement = (element) => {
                this.codeElement = element;
            }

            render() {
                return (
                    <React.Fragment>
                        <textarea
                            className="editor__input-area"
                            spellCheck={false}
                            autoComplete="off"
                            autoCorrect="off"
                            autoCapitalize="none"
                            value={this.state.text}
                            onChange={this.onChangeText}
                            onScroll={this.onScroll}
                        />
                        <div className="editor__output-area">
                            <pre
                                className="editor__output-area-wrapper"
                                style={{
                                    top: -this.state.scrollTop,
                                    left: -this.state.scrollLeft,
                                }}
                            >
                                <code
                                    ref={this.setCodeElement}
                                    className="editor__output-area-body lua"
                                >
                                    {this.state.text}
                                </code>
                            </pre>
                        </div>
                    </React.Fragment>
                );
            }
        }

        ReactDOM.render(
            <Editor />,
            document.getElementById('container')
        );
    </script>
    </head>
    <body>
        <div id="container"></div>
    </body>
</html>
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8">
	<meta http-equiv="content-type" content="text/html; charset=UTF-8">
	<meta name="viewport" content="width=device-width, initial-scale=1">
	<title>Lua editor with Syntax highlighting</title>
	<script src="https://cdnjs.cloudflare.com/ajax/libs/babel-standalone/6.26.0/babel.min.js"></script>
	<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.2.0/umd/react.production.min.js"></script>
	<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.2.0/umd/react-dom.production.min.js"></script>
	<script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/highlight.min.js"></script>
	<script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/languages/lua.min.js"></script>
	<link rel="stylesheet" type="text/css" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/solarized-dark.min.css">

	<style>
	.editor__input-area {
	position: absolute;
	top: 0;
	left: 0;
	outline: 0;
	margin: 0;
	border: 0;
	border-radius: 0;
	padding: 0;
	width: 100%;
	height: 100%;
	font-family: monospace;
	font-size: 24px;
	color: #fff;
	-webkit-text-fill-color: transparent;
	white-space: nowrap;
	overflow: auto;
	background-color: #002b36;
	}

	.editor__output-area {
	position: absolute;
	overflow: hidden;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	pointer-events: none;
	}

	.editor__output-area-wrapper {
	position: absolute;
	left: 0;
	width: 100%;
	height: 100%;
	margin: 0;
	padding: 0;
	}

	.editor__output-area-body {
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	margin: 0;
	padding: 0;
	font-size: 24px;
	background: transparent;
	overflow: visible;
	}
	</style>
	</head>
	<script type="text/babel" data-presets="es2017,react">
	hljs.initHighlightingOnLoad();

	class Editor extends React.PureComponent {
	state = {
	text: '',
	scrollTop: 0,
	scrollLeft: 0,
	};

	highlight = () => {
	if (this.codeElement) {
	hljs.highlightBlock(this.codeElement);
	}
	};

	onChangeText = ({target}) => {
	this.setState({text: target.value}, this.highlight);
	};

	onScroll = ({target}) => {
	this.setState({
	scrollTop: target.scrollTop,
	scrollLeft: target.scrollLeft,
	});
	};

	setCodeElement = (element) => {
	this.codeElement = element;
	}

	render() {
	return (
	<React.Fragment>
	<textarea
	className="editor__input-area"
	spellCheck={false}
	autoComplete="off"
	autoCorrect="off"
	autoCapitalize="none"
	value={this.state.text}
	onChange={this.onChangeText}
	onScroll={this.onScroll}
	/>
	<div className="editor__output-area">
	<pre
	className="editor__output-area-wrapper"
	style={{
	top: -this.state.scrollTop,
	left: -this.state.scrollLeft,
	}}
	>
	<code
	ref={this.setCodeElement}
	className="editor__output-area-body lua"
	>
	{this.state.text}
	</code>
	</pre>
	</div>
	</React.Fragment>
	);
	}
	}

	ReactDOM.render(
	<Editor />,
	document.getElementById('container')
	);
	</script>
	</head>
	<body>
	<div id="container"></div>
	</body>
	</html>