mirror of
https://github.com/squidfunk/mkdocs-material.git
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123 lines
3.5 KiB
TypeScript
123 lines
3.5 KiB
TypeScript
/*
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* Copyright (c) 2016-2022 Martin Donath <martin.donath@squidfunk.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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import {
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Observable,
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map,
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of,
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shareReplay,
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tap
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} from "rxjs"
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import { watchScript } from "~/browser"
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import { h } from "~/utilities"
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import { Component } from "../../../_"
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import themeCSS from "./index.css"
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/* ----------------------------------------------------------------------------
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* Types
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* ------------------------------------------------------------------------- */
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/**
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* Mermaid diagram
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*/
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export interface Mermaid {}
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/* ----------------------------------------------------------------------------
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* Data
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* ------------------------------------------------------------------------- */
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/**
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* Mermaid instance observable
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*/
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let mermaid$: Observable<void>
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/**
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* Global index for Mermaid integration
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*/
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let index = 0
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/* ----------------------------------------------------------------------------
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* Helper functions
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* ------------------------------------------------------------------------- */
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/**
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* Fetch Mermaid script
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*
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* @returns Mermaid scripts observable
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*/
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function fetchScripts(): Observable<void> {
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return typeof mermaid === "undefined" || mermaid instanceof Element
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? watchScript("https://unpkg.com/mermaid@8.13.3/dist/mermaid.min.js")
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: of(undefined)
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}
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/* ----------------------------------------------------------------------------
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* Functions
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* ------------------------------------------------------------------------- */
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/**
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* Mount Mermaid diagram
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*
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* @param el - Code block element
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*
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* @returns Mermaid diagram component observable
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*/
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export function mountMermaid(
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el: HTMLElement
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): Observable<Component<Mermaid>> {
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el.classList.remove("mermaid") // Hack: mitigate https://bit.ly/3CiN6Du
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mermaid$ ||= fetchScripts()
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.pipe(
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tap(() => mermaid.initialize({
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startOnLoad: false,
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themeCSS
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})),
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map(() => undefined),
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shareReplay(1)
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)
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/* Render diagram */
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mermaid$.subscribe(() => {
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el.classList.add("mermaid") // Hack: mitigate https://bit.ly/3CiN6Du
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const id = `__mermaid_${index++}`
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const host = h("div", { class: "mermaid" })
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mermaid.mermaidAPI.render(id, el.textContent, (svg: string) => {
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/* Create a shadow root and inject diagram */
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const shadow = host.attachShadow({ mode: "closed" })
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shadow.innerHTML = svg
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/* Replace code block with diagram */
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el.replaceWith(host)
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})
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})
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/* Create and return component */
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return mermaid$
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.pipe(
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map(() => ({ ref: el }))
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)
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}
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