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import React, { useState } from "react";
import ReactDOM from "react-dom";
import hljs from "highlight.js/lib/core";
// const hljs = window.hljs;
import "highlight.js/styles/devibeans.css";
import markdown from "highlight.js/lib/languages/markdown.js";
import javascript from "highlight.js/lib/languages/javascript.js";
import python from "highlight.js/lib/languages/python.js";
import C from "highlight.js/lib/languages/c.js";
import bash from "highlight.js/lib/languages/bash.js";
import "../index.css";
import mit from "markdown-it";
import mithljs from "markdown-it-highlightjs";
import mittexmath from "markdown-it-texmath";
import mitmmdtable from "markdown-it-multimd-table";
import katex from "katex";
hljs.registerLanguage("markdown", markdown);
hljs.registerLanguage("javascript", javascript);
hljs.registerLanguage("python", python);
hljs.registerLanguage("c", C);
hljs.registerLanguage("bash", bash);
const md = new mit({ html: true })
.enable(["table"])
.use(mittexmath, {
engine: katex,
delimiters: "gitlab",
katexOptions: { output: "mathml" },
})
.use(mitmmdtable)
.use(mithljs, { inline: true, auto: true, code: true, hljs: hljs });
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.handleTitleClick = this.handleTitleClick.bind(this);
this.state = { value: "", drawerActive: false };
// this.hljs_worker = new Worker("../highlight_worker.js");
// this.md_worker = new Worker("../parse_worker.js");
}
// TODO-use web worker instead
updateCodeSyntaxHighlighting() {
document.querySelectorAll("pre code").forEach((block) => {
hljs.highlightElement(block);
});
// this.hljs_worker.postMessage("message");
// this.hljs_worker.ouMessage = (event) => {
// console.log("highlighed successfully");
// };
}
// TODO-use web worker instead
parseMarkdown(event) {
let element = document.getElementById("markdown-placeholder");
let htm = md.render(event.target.value);
element.innerHTML = htm;
// this.md_worker.postMessage(event);
// this.md_worker.onMessage((htm) => {
// element.innerHTML = htm;
// });
}
handleChange(event) {
// this.setState({ value: event.target.value });
}
handleInput(event) {
let result_element = document.getElementById("highlight-content");
result_element.textContent = event.target.value;
this.updateCodeSyntaxHighlighting();
this.parseMarkdown(event);
result_element.scrollTop = event.currentTarget.scrollTop;
result_element.scrollLeft = event.currentTarget.scrollLeft;
let result_element_2 = document.querySelector("#highlight");
result_element_2.scrollTop = event.currentTarget.scrollTop;
result_element_2.scrollLeft = event.currentTarget.scrollLeft;
this.setState({ value: event.target.value });
}
handleScroll(event) {
let result_element = document.querySelector("#highlight-content");
result_element.scrollTop = event.currentTarget.scrollTop;
result_element.scrollLeft = event.currentTarget.scrollLeft;
let result_element_2 = document.querySelector("#highlight");
result_element_2.scrollTop = event.currentTarget.scrollTop;
result_element_2.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(event);
}
}
handleTitleClick() {
this.setState((prevState) => ({ drawerActive: !prevState.drawerActive }));
}
render() {
const { markdownText, drawerTitle, drawerChildren } = this.props;
const drawerStyles = this.state.drawerActive ? "is-expanded" : "";
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"
tabIndex="0"
>
{markdownText}
</textarea>
</div>
<div className="split right">
<div direction="rtl" id="markdown-placeholder"></div>
</div>
</div>
);
}
}
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