Bundling JS with ESBuild (#702)

* add npm dependencies used in this theme * implement helper to configure JS and ESBuild * migrate jquery popper.js bootstrap fontawesome to js bundle * refactor main.js into smaller pieces, and moved navbar.js to assets * remove list.js. It adjusts post card height to be the same, but is actually not needed. * refactored notes.js, search.js, single.js into application.js * move ityped to js asset, implement experiences horizontal vertical line in css * align recent post height via css * migrated home.js and refactored into various sections * migrated darkMode feature to js bundle * moved mermaid feature to js bundle * migrate syntax highlight to js bundle * migrate katex ( js portion ) to js bundle * migrate pdf-js to js bundle by delegating to cdn * set explicit comparisions for feature envvars so js can properly optimize * removed goat-counter * more fixes for broken achievements and small bugs * more bug fixes * allow configuration of hightlight.js, fix video-player shortcode * remove jquery all together * add null handling and fix merge conflicts Co-authored-by: Aaron Qian <aaron@yeet.io>
2023-01-05 10:42:54 -08:00 · 2023-01-05 10:42:54 -08:00 · 02db3d3044
commit 02db3d3044
parent fe14b0fbf5
491 changed files with 4919 additions and 151344 deletions
--- a/assets/scripts/features/embedpdf/index.js
+++ b/assets/scripts/features/embedpdf/index.js
@ -0,0 +1,165 @@
+import { insertScript } from '../../core'
+
+const PDFJS_BUNDLE = 'https://cdn.jsdelivr.net/npm/pdfjs-dist@3.0.279/build/pdf.min.js'
+const WORKER_BUNDLE = 'https://cdn.jsdelivr.net/npm/pdfjs-dist@3.0.279/build/pdf.worker.min.js'
+
+class PDFViewer {
+  constructor (el) {
+    const {
+      url,
+      hidePaginator,
+      hideLoader,
+      scale,
+      pageNum
+    } = el.dataset
+
+    if (url == null) {
+      throw new Error('Cannot load PDF! Attribute `data-url` is not set.')
+    }
+
+    // props
+    this.url = url
+    this.hidePaginator = hidePaginator !== 'false'
+    this.hideLoader = hideLoader !== 'false'
+    this.scale = scale || 3
+
+    // initial state
+    this.pageNum = parseInt(pageNum, 10) || 1
+    this.loaded = false
+    this.pageRendering = false
+    this.pageNumPending = null
+
+    // DOM elements
+    this.canvas = el.getElementsByClassName('pdf-canvas')[0]
+    if (this.canvas == null) {
+      throw new Error('canvas element not found!')
+    };
+    this.paginator = el.getElementsByClassName('paginator')[0]
+    this.loadingWrapper = el.getElementsByClassName('loading-wrapper')[0]
+    this.next = el.getElementsByClassName('next')[0]
+    this.prev = el.getElementsByClassName('prev')[0]
+    this.pageNum = el.getElementsByClassName('page-num')[0]
+    this.pageCount = el.getElementsByClassName('page-count')[0]
+
+    // context
+    this.ctx = this.canvas.getContext('2d')
+
+    // events
+    this.next.addEventListener('click', this.handleNextPage.bind(this))
+    this.prev.addEventListener('click', this.handlePrevPage.bind(this))
+
+    this.showPaginator()
+    this.showLoader()
+    this.loadPDF()
+  }
+
+  /**
+   * If we haven't disabled the loader, show loader and hide canvas
+   */
+  showLoader () {
+    if (this.hideLoader) return
+    this.loadingWrapper.style.display = 'flex'
+    this.canvas.style.display = 'none'
+  }
+
+  /**
+   * If we haven't disabled the paginator, show paginator
+   */
+  showPaginator () {
+    if (this.hidePaginator) return
+    this.paginator.style.display = 'block'
+  }
+
+  /**
+   * Hides loader and shows canvas
+   */
+  showContent () {
+    this.loadingWrapper.style.display = 'none'
+    this.canvas.style.display = 'block'
+  }
+
+  /**
+   * Asynchronously downloads PDF.
+   */
+  async loadPDF () {
+    this.pdfDoc = await window.pdfjsLib.getDocument(this.url).promise
+
+    this.pageCount.textContent = this.pdfDoc.numPages
+
+    // If the user passed in a number that is out of range, render the last page.
+    if (this.pageNum > this.pdfDoc.numPages) {
+      this.pageNum = this.pdfDoc.numPages
+    }
+
+    this.renderPage(this.pageNum)
+  }
+
+  /**
+   * Get page info from document, resize canvas accordingly, and render page.
+   * @param num Page number.
+   */
+  async renderPage (num) {
+    this.pageRendering = true
+
+    const page = await this.pdfDoc.getPage(num)
+    const viewport = page.getViewport({ scale: this.scale })
+    this.canvas.height = viewport.height
+    this.canvas.width = viewport.width
+
+    // Wait for rendering to finish
+    await page.render({
+      canvasContext: this.ctx,
+      viewport
+    }).promise
+
+    this.pageRendering = false
+    this.showContent()
+
+    if (this.pageNumPending !== null) {
+      // New page rendering is pending
+      this.renderPage(this.pageNumPending)
+      this.pageNumPending = null
+    }
+    // Update page counters
+    this.pageNum.textContent = num
+  }
+
+  /**
+   * If another page rendering in progress, waits until the rendering is
+   * finished. Otherwise, executes rendering immediately.
+   */
+  queueRenderPage (num) {
+    if (this.pageRendering) {
+      this.pageNumPending = num
+    } else {
+      this.renderPage(num)
+    }
+  }
+
+  /**
+   * Displays previous page.
+   */
+  handlePrevPage () {
+    if (this.pageNum <= 1) {
+      return
+    }
+    this.pageNum--
+    this.queueRenderPage(this.pageNum)
+  }
+
+  /**
+   * Displays next page.
+   */
+  handleNextPage () {
+    if (this.pageNum >= this.pdfDoc.numPages) {
+      return
+    }
+    this.pageNum++
+    this.queueRenderPage(this.pageNum)
+  }
+}
+
+insertScript('pdfjs', PDFJS_BUNDLE, () => {
+  window.pdfjsLib.GlobalWorkerOptions.workerSrc = WORKER_BUNDLE
+  Array.from(document.getElementsByClassName('pdf-viewer')).forEach(el => new PDFViewer(el))
+})