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import React from "react";
import ReactDOM from "react-dom";
import hljs from "highlight.js/lib/core";
import "highlight.js/styles/devibeans.css";
import markdown from "highlight.js/lib/languages/markdown.js";
import "../index.css";
import mit from "markdown-it";
hljs.registerLanguage("markdown", markdown);
// const mit = require("markdown-it")({ html: true })
// .enable(["table"])
// .disable(["strikethrough"])
// .use(require("markdown-it-texmath"), {
// engine: require("katex"),
// delimiters: "gitlab",
// katexOptions: { macros: { "\\RR": "\\mathbb{R}" } },
// })
// .use(require("markdown-it-multimd-table"))
// .use(require("markdown-it-highlightjs"), {
// inline: true,
// auto: true,
// code: true,
// });
export default class Editor extends React.Component {
constructor(props) {
super(props);
this.handleInput = this.handleInput.bind(this);
this.handleScroll = this.handleScroll.bind(this);
this.handleKeyDown = this.handleKeyDown.bind(this);
this.updateCodeSyntaxHighlighting =
this.updateCodeSyntaxHighlighting.bind(this);
this.handleChange = this.handleChange.bind(this);
this.parseMarkdown = this.parseMarkdown.bind(this);
this.state = { value: "" };
}
// TODO-we should highlight through a web worker
updateCodeSyntaxHighlighting() {
document.querySelectorAll("pre code").forEach((block) => {
hljs.highlightElement(block);
});
}
parseMarkdown() {
let element = document.getElementById("markdown-placeholder");
let md = new mit();
let htm = md.render(this.state.value);
element.innerHTML = htm;
console.log(htm);
console.log(md.render("# markdown-it rulezz!"));
}
handleChange(event) {
this.setState({ value: event.target.value });
}
handleInput(event) {
// let text = this.state.value;
let result_element = document.getElementById("highlight-content");
result_element.textContent = this.state.value;
this.updateCodeSyntaxHighlighting();
this.parseMarkdown();
let result_element_2 = document.querySelector("#highlight");
result_element_2.scrollTop = event.currentTarget.scrollTop;
result_element_2.scrollLeft = event.currentTarget.scrollLeft;
}
handleScroll(event) {
let result_element = document.querySelector("#highlight");
result_element.scrollTop = event.currentTarget.scrollTop;
result_element.scrollLeft = event.currentTarget.scrollLeft;
}
handleKeyDown(event) {
let element = event.currentTarget;
let code = this.state.value;
if (event.key == "Tab") {
event.preventDefault();
let before_tab = code.slice(0, element.selectionStart);
let after_tab = code.slice(element.selectionEnd, element.value.length);
let cursor_pos = element.selectionEnd + 1;
element.value = before_tab + "\t" + after_tab;
element.selectionStart = cursor_pos;
element.selectionEnd = cursor_pos;
this.handleInput(element.value, element);
}
}
render() {
return (
<div>
<div>
<pre id="highlight" aria-hidden="true" direction="rtl">
<code
id="highlight-content"
className="language-markdown"
direction="rtl"
></code>
</pre>
<textarea
spellcheck="false"
name="editor"
className="editor"
id="editor"
value={this.state.value}
onChange={this.handleChange.bind(this)}
onInput={this.handleInput.bind(this)}
onScroll={this.handleScroll.bind(this)}
onKeyDown={this.handleKeyDown.bind(this)}
direction="rtl"
></textarea>
</div>
<div className="split right">
<p direction="rtl" id="markdown-placeholder"></p>
</div>
</div>
);
}
}
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