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feat: improve messages render performance (casibase#777)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,91 @@ | ||
| // Copyright 2023 The casbin Authors. All Rights Reserved. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| import {marked} from "marked"; | ||
| import DOMPurify from "dompurify"; | ||
| import katex from "katex"; | ||
| import "katex/dist/katex.min.css"; | ||
| import hljs from "highlight.js"; | ||
| import "highlight.js/styles/atom-one-dark-reasonable.css"; | ||
|
|
||
| marked.setOptions({ | ||
| renderer: new marked.Renderer(), | ||
| gfm: true, | ||
| tables: true, | ||
| breaks: true, | ||
| pedantic: false, | ||
| sanitize: false, | ||
| smartLists: true, | ||
| smartypants: true, | ||
| }); | ||
|
|
||
| export function renderMarkdown(text) { | ||
| const rawHtml = marked(text); | ||
| let cleanHtml = DOMPurify.sanitize(rawHtml); | ||
| /* replace <p></p> with <div></div>, reduce paragraph spacing. */ | ||
| cleanHtml = cleanHtml.replace(/<p>/g, "<div>").replace(/<\/p>/g, "</div>"); | ||
| /* h2 is larger than h1, h2 is the largest, so replace h1 with h2, and set margin as 20px. */ | ||
| cleanHtml = cleanHtml.replace(/<h1>/g, "<h2>").replace(/<(h[1-6])>/g, "<$1 style='margin-top: 20px; margin-bottom: 20px'>"); | ||
| /* adjust margin and internal gap for unordered list and ordered list. */ | ||
| cleanHtml = cleanHtml.replace(/<(ul)>/g, "<ul style='display: flex; flex-direction: column; gap: 10px; margin-top: 10px; margin-bottom: 10px'>").replace(/<(ol)>/g, "<ol style='display: flex; flex-direction: column; gap: 0px; margin-top: 20px; margin-bottom: 20px'>"); | ||
| /* adjust code block, for auto line feed. */ | ||
| cleanHtml = cleanHtml.replace(/<pre>/g, "<pre style='white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;'>"); | ||
| return cleanHtml; | ||
| } | ||
|
|
||
| export function renderLatex(text) { | ||
| const inlineLatexRegex = /\(\s*(([a-zA-Z])|(\\.+?)|([^)]*?[_^!].*?))\s*\)/g; | ||
| const blockLatexRegex = /\[\s*(.+?)\s*\]/g; | ||
|
|
||
| text = text.replace(blockLatexRegex, (match, formula) => { | ||
| try { | ||
| return katex.renderToString(formula, { | ||
| throwOnError: false, | ||
| displayMode: true, | ||
| }); | ||
| } catch (error) { | ||
| return match; | ||
| } | ||
| }); | ||
|
|
||
| return text.replace(inlineLatexRegex, (match, formula) => { | ||
| try { | ||
| return katex.renderToString(formula, { | ||
| throwOnError: false, | ||
| displayMode: false, | ||
| }); | ||
| } catch (error) { | ||
| return match; | ||
| } | ||
| }); | ||
| } | ||
|
|
||
| export function renderCode(text) { | ||
| const tempDiv = document.createElement("div"); | ||
| tempDiv.innerHTML = text; | ||
| tempDiv.querySelectorAll("pre code").forEach((block) => { | ||
| hljs.highlightBlock(block); | ||
| }); | ||
| return tempDiv.innerHTML; | ||
| } | ||
|
|
||
| export function renderText(text) { | ||
| let html; | ||
| html = renderMarkdown(text); | ||
| html = renderLatex(html); | ||
| html = renderCode(html); | ||
| return ( | ||
| <div dangerouslySetInnerHTML={{__html: html}} style={{display: "flex", flexDirection: "column", gap: "0px"}} /> | ||
| ); | ||
| } |
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