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webr.html
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<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"><head>
<meta charset="utf-8">
<meta name="generator" content="quarto-1.4.205">
<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
<title> </title>
<style>
code{white-space: pre-wrap;}
span.smallcaps{font-variant: small-caps;}
div.columns{display: flex; gap: min(4vw, 1.5em);}
div.column{flex: auto; overflow-x: auto;}
div.hanging-indent{margin-left: 1.5em; text-indent: -1.5em;}
ul.task-list{list-style: none;}
ul.task-list li input[type="checkbox"] {
width: 0.8em;
margin: 0 0.8em 0.2em -1em; /* quarto-specific, see https://github.com/quarto-dev/quarto-cli/issues/4556 */
vertical-align: middle;
}
</style>
<script src="webr_files/libs/clipboard/clipboard.min.js"></script>
<script src="webr_files/libs/quarto-html/quarto.js"></script>
<script src="webr_files/libs/quarto-html/popper.min.js"></script>
<script src="webr_files/libs/quarto-html/tippy.umd.min.js"></script>
<script src="webr_files/libs/quarto-html/anchor.min.js"></script>
<link href="webr_files/libs/quarto-html/tippy.css" rel="stylesheet">
<link href="webr_files/libs/quarto-html/quarto-syntax-highlighting.css" rel="stylesheet" id="quarto-text-highlighting-styles">
<script src="webr_files/libs/bootstrap/bootstrap.min.js"></script>
<link href="webr_files/libs/bootstrap/bootstrap-icons.css" rel="stylesheet">
<link href="webr_files/libs/bootstrap/bootstrap.min.css" rel="stylesheet" id="quarto-bootstrap" data-mode="light">
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/monaco-editor@0.31.0/min/vs/editor/editor.main.css">
<style>
.monaco-editor pre {
background-color: unset !important;
}
.btn-webr {
background-color: #EEEEEE;
border-bottom-left-radius: 0;
border-bottom-right-radius: 0;
}
</style>
<script src="https://cdn.jsdelivr.net/npm/monaco-editor@0.31.0/min/vs/loader.js"></script>
<script type="module">
// Configure the Monaco Editor's loader
require.config({
paths: {
'vs': 'https://cdn.jsdelivr.net/npm/monaco-editor@0.31.0/min/vs'
}
});
// Start a timer
const initializeWebRTimerStart = performance.now();
// Determine if we need to install R packages
var installRPackagesList = [''];
// Check to see if we have an empty array, if we do set to skip the installation.
var setupRPackages = !(installRPackagesList.indexOf("") !== -1);
// Display a startup message?
var showStartupMessage = true;
var showHeaderMessage = false;
if (showStartupMessage) {
// Create the outermost div element
var quartoTitleMeta = document.createElement("div");
quartoTitleMeta.classList.add("quarto-title-meta");
// Create the first inner div element
var firstInnerDiv = document.createElement("div");
// Create the second inner div element with "WebR Status" heading
// and contents
var secondInnerDiv = document.createElement("div");
secondInnerDiv.classList.add("quarto-title-meta-heading");
secondInnerDiv.innerText = "WebR Status";
// Add another inner div
var secondInnerDivContents = document.createElement("div");
secondInnerDivContents.classList.add("quarto-title-meta-contents");
// Describe the WebR state
var startupMessageWebR = document.createElement("p");
startupMessageWebR.innerText = "🟡 Loading...";
startupMessageWebR.setAttribute("id", "startup");
// Add `aria-live` to auto-announce the startup status to screen readers
startupMessageWebR.setAttribute("aria-live", "assertive");
// Put everything together
secondInnerDivContents.appendChild(startupMessageWebR);
// Add a status indicator for COOP and COEP Headers
if (showHeaderMessage) {
var crossOriginMessage = document.createElement("p");
crossOriginMessage.innerText = `${crossOriginIsolated ? '🟢' : '🟡'} COOP & COEP Headers`;
crossOriginMessage.setAttribute("id", "coop-coep-header");
secondInnerDivContents.appendChild(crossOriginMessage);
}
firstInnerDiv.appendChild(secondInnerDiv);
firstInnerDiv.appendChild(secondInnerDivContents);
quartoTitleMeta.appendChild(firstInnerDiv);
// Add new element as last child in header element
var header = document.getElementsByTagName("header")[0];
header.appendChild(quartoTitleMeta);
}
// Retrieve the webr.mjs
import { WebR } from "https://webr.r-wasm.org/v0.1.1/webr.mjs";
// Populate WebR options with defaults or new values based on
// webr meta
globalThis.webR = new WebR({
"baseURL": "",
"serviceWorkerUrl": "",
"homedir": "/home/web_user"
});
// Initialization WebR
await globalThis.webR.init();
// Setup a shelter
globalThis.webRCodeShelter = await new globalThis.webR.Shelter();
// Installing Packages
if (showStartupMessage && setupRPackages) {
// If initialized, but we have packages to install switch status
startupMessageWebR.innerText = "🟡 Installing package dependencies..."
// Install packages
await globalThis.webR.installPackages(installRPackagesList)
}
// Switch to allowing code to be executed
document.querySelectorAll(".btn-webr").forEach((btn) => {
btn.innerText = "Run code";
btn.disabled = false;
});
// Stop timer
const initializeWebRTimerEnd = performance.now();
if (showStartupMessage) {
// If initialized, switch to a green light
startupMessageWebR.innerText = "🟢 Ready!"
}
</script>
</head>
<body class="fullcontent">
<div id="quarto-content" class="page-columns page-rows-contents page-layout-article">
<main class="content" id="quarto-document-content">
<header id="title-block-header" class="quarto-title-block default">
<div class="quarto-title">
<h1 class="title"> </h1>
</div>
<div class="quarto-title-meta">
</div>
</header>
<style>
body {
background-color: black;
}
pre code {
color: white;
}
.quarto-title-meta-heading,
.quarto-title-meta-contents {
color: white !important;
}
</style>
<button class="btn btn-default btn-webr" disabled="" type="button" id="webr-run-button-1">Loading
webR...</button>
<div id="webr-editor-1"></div>
<div id="webr-code-output-1" aria-live="assertive">
<pre style="visibility: hidden"></pre>
</div>
<script type="module">
// Retrieve webR code cell information
const runButton = document.getElementById("webr-run-button-1");
const outputDiv = document.getElementById("webr-code-output-1");
const editorDiv = document.getElementById("webr-editor-1");
// Add a light grey outline around the code editor
editorDiv.style.border = "1px solid #eee";
// Load the Monaco Editor and create an instance
let editor;
require(['vs/editor/editor.main'], function () {
editor = monaco.editor.create(editorDiv, {
value: `sessionInfo()`,
language: 'r',
theme: 'vs-light',
automaticLayout: true, // TODO: Could be problematic for slide decks
scrollBeyondLastLine: false,
minimap: {
enabled: false
},
fontSize: '17.5rem', // Bootstrap is 1 rem
renderLineHighlight: "none", // Disable current line highlighting
hideCursorInOverviewRuler: true // Remove cursor indictor in right hand side scroll bar
});
// Add a keydown event listener for Shift+Enter using the addCommand method
editor.addCommand(monaco.KeyMod.Shift | monaco.KeyCode.Enter, function () {
// Code to run when Shift+Enter is pressed
executeCode(editor.getValue());
});
// Add a keydown event listener for Ctrl+Enter to run selected code
editor.addCommand(monaco.KeyMod.CtrlCmd | monaco.KeyCode.Enter, function () {
// Get the selected text from the editor
const selectedText = editor.getModel().getValueInRange(editor.getSelection());
// Code to run when Ctrl+Enter is pressed (run selected code)
executeCode(selectedText);
});
// Dynamically modify the height of the editor window if new lines are added.
let ignoreEvent = false;
const updateHeight = () => {
const contentHeight = editor.getContentHeight();
// We're avoiding a width change
//editorDiv.style.width = `${width}px`;
editorDiv.style.height = `${contentHeight}px`;
try {
ignoreEvent = true;
// The key to resizing is this call
editor.layout();
} finally {
ignoreEvent = false;
}
};
// Register an on change event for when new code is added to the editor window
editor.onDidContentSizeChange(updateHeight);
// Manually re-update height to account for the content we inserted into the call
updateHeight();
});
// Function to execute the code (accepts code as an argument)
async function executeCode(codeToRun) {
// Disable run button for code cell active
runButton.disabled = true;
// Create a canvas variable for graphics
let canvas = undefined;
// Initialize webR
await globalThis.webR.init();
// Setup a webR canvas
await webR.evalRVoid("canvas(width=504, height=360)");
// Capture output data from evaluating the code
const result = await webRCodeShelter.captureR(codeToRun, {
withAutoprint: true,
captureStreams: true,
captureConditions: false,
env: webR.objs.emptyEnv,
});
// Start attempting to parse the result data
try {
// Stop creating images
await webR.evalRVoid("dev.off()");
// Merge output streams of STDOUT and STDErr (messages and errors are combined.)
const out = result.output.filter(
evt => evt.type == "stdout" || evt.type == "stderr"
).map((evt) => evt.data).join("\n");
// Clean the state
const msgs = await webR.flush();
// Output each image stored
msgs.forEach(msg => {
if (msg.type === "canvasExec") {
if (!canvas) {
canvas = document.createElement("canvas");
canvas.setAttribute("width", 2 * 504);
canvas.setAttribute("height", 2 * 360);
canvas.style.width = "700px";
canvas.style.display = "block";
canvas.style.margin = "auto";
}
Function(`this.getContext("2d").${msg.data}`).bind(canvas)();
}
});
// Nullify the outputDiv of content
outputDiv.innerHTML = "";
// Design an output object for messages
const pre = document.createElement("pre");
if (/\S/.test(out)) {
// Display results as text
const code = document.createElement("code");
code.innerText = out;
pre.appendChild(code);
} else {
// If nothing is present, hide the element.
pre.style.visibility = "hidden";
}
outputDiv.appendChild(pre);
// Place the graphics on the canvas
if (canvas) {
const p = document.createElement("p");
p.appendChild(canvas);
outputDiv.appendChild(p);
}
} finally {
// Clean up the remaining code
webRCodeShelter.purge();
runButton.disabled = false;
}
}
// Add a click event listener to the run button
runButton.onclick = function () {
executeCode(editor.getValue());
};
</script>
</main>
<!-- /main column -->
<script id="quarto-html-after-body" type="application/javascript">
window.document.addEventListener("DOMContentLoaded", function (event) {
const toggleBodyColorMode = (bsSheetEl) => {
const mode = bsSheetEl.getAttribute("data-mode");
const bodyEl = window.document.querySelector("body");
if (mode === "dark") {
bodyEl.classList.add("quarto-dark");
bodyEl.classList.remove("quarto-light");
} else {
bodyEl.classList.add("quarto-light");
bodyEl.classList.remove("quarto-dark");
}
}
const toggleBodyColorPrimary = () => {
const bsSheetEl = window.document.querySelector("link#quarto-bootstrap");
if (bsSheetEl) {
toggleBodyColorMode(bsSheetEl);
}
}
toggleBodyColorPrimary();
const icon = "";
const anchorJS = new window.AnchorJS();
anchorJS.options = {
placement: 'right',
icon: icon
};
anchorJS.add('.anchored');
const isCodeAnnotation = (el) => {
for (const clz of el.classList) {
if (clz.startsWith('code-annotation-')) {
return true;
}
}
return false;
}
const clipboard = new window.ClipboardJS('.code-copy-button', {
text: function(trigger) {
const codeEl = trigger.previousElementSibling.cloneNode(true);
for (const childEl of codeEl.children) {
if (isCodeAnnotation(childEl)) {
childEl.remove();
}
}
return codeEl.innerText;
}
});
clipboard.on('success', function(e) {
// button target
const button = e.trigger;
// don't keep focus
button.blur();
// flash "checked"
button.classList.add('code-copy-button-checked');
var currentTitle = button.getAttribute("title");
button.setAttribute("title", "Copied!");
let tooltip;
if (window.bootstrap) {
button.setAttribute("data-bs-toggle", "tooltip");
button.setAttribute("data-bs-placement", "left");
button.setAttribute("data-bs-title", "Copied!");
tooltip = new bootstrap.Tooltip(button,
{ trigger: "manual",
customClass: "code-copy-button-tooltip",
offset: [0, -8]});
tooltip.show();
}
setTimeout(function() {
if (tooltip) {
tooltip.hide();
button.removeAttribute("data-bs-title");
button.removeAttribute("data-bs-toggle");
button.removeAttribute("data-bs-placement");
}
button.setAttribute("title", currentTitle);
button.classList.remove('code-copy-button-checked');
}, 1000);
// clear code selection
e.clearSelection();
});
function tippyHover(el, contentFn, onTriggerFn, onUntriggerFn) {
const config = {
allowHTML: true,
maxWidth: 500,
delay: 100,
arrow: false,
appendTo: function(el) {
return el.parentElement;
},
interactive: true,
interactiveBorder: 10,
theme: 'quarto',
placement: 'bottom-start',
};
if (contentFn) {
config.content = contentFn;
}
if (onTriggerFn) {
config.onTrigger = onTriggerFn;
}
if (onUntriggerFn) {
config.onUntrigger = onUntriggerFn;
}
window.tippy(el, config);
}
const noterefs = window.document.querySelectorAll('a[role="doc-noteref"]');
for (var i=0; i<noterefs.length; i++) {
const ref = noterefs[i];
tippyHover(ref, function() {
// use id or data attribute instead here
let href = ref.getAttribute('data-footnote-href') || ref.getAttribute('href');
try { href = new URL(href).hash; } catch {}
const id = href.replace(/^#\/?/, "");
const note = window.document.getElementById(id);
return note.innerHTML;
});
}
const xrefs = window.document.querySelectorAll('a.quarto-xref');
const processXRef = (id, note) => {
if (id.startsWith('sec-')) {
// Special case sections, only their first couple elements
const container = document.createElement("div");
if (note.children && note.children.length > 2) {
for (let i = 0; i < 2; i++) {
container.appendChild(note.children[i].cloneNode(true));
}
return container.innerHTML
} else {
return note.innerHTML;
}
} else {
return note.innerHTML;
}
}
for (var i=0; i<xrefs.length; i++) {
const xref = xrefs[i];
tippyHover(xref, undefined, function(instance) {
instance.disable();
let url = xref.getAttribute('href');
let hash = undefined;
try { hash = new URL(url).hash; } catch {}
const id = hash.replace(/^#\/?/, "");
const note = window.document.getElementById(id);
if (note !== null) {
try {
const html = processXRef(id, note);
instance.setContent(html);
} finally {
instance.enable();
instance.show();
}
} else {
// See if we can fetch this
fetch(url.split('#')[0])
.then(res => res.text())
.then(html => {
const parser = new DOMParser();
const htmlDoc = parser.parseFromString(html, "text/html");
const note = htmlDoc.getElementById(id);
if (note !== null) {
const html = processXRef(id, note);
instance.setContent(html);
}
}).finally(() => {
instance.enable();
instance.show();
});
}
}, function(instance) {
});
}
let selectedAnnoteEl;
const selectorForAnnotation = ( cell, annotation) => {
let cellAttr = 'data-code-cell="' + cell + '"';
let lineAttr = 'data-code-annotation="' + annotation + '"';
const selector = 'span[' + cellAttr + '][' + lineAttr + ']';
return selector;
}
const selectCodeLines = (annoteEl) => {
const doc = window.document;
const targetCell = annoteEl.getAttribute("data-target-cell");
const targetAnnotation = annoteEl.getAttribute("data-target-annotation");
const annoteSpan = window.document.querySelector(selectorForAnnotation(targetCell, targetAnnotation));
const lines = annoteSpan.getAttribute("data-code-lines").split(",");
const lineIds = lines.map((line) => {
return targetCell + "-" + line;
})
let top = null;
let height = null;
let parent = null;
if (lineIds.length > 0) {
//compute the position of the single el (top and bottom and make a div)
const el = window.document.getElementById(lineIds[0]);
top = el.offsetTop;
height = el.offsetHeight;
parent = el.parentElement.parentElement;
if (lineIds.length > 1) {
const lastEl = window.document.getElementById(lineIds[lineIds.length - 1]);
const bottom = lastEl.offsetTop + lastEl.offsetHeight;
height = bottom - top;
}
if (top !== null && height !== null && parent !== null) {
// cook up a div (if necessary) and position it
let div = window.document.getElementById("code-annotation-line-highlight");
if (div === null) {
div = window.document.createElement("div");
div.setAttribute("id", "code-annotation-line-highlight");
div.style.position = 'absolute';
parent.appendChild(div);
}
div.style.top = top - 2 + "px";
div.style.height = height + 4 + "px";
div.style.left = 0;
let gutterDiv = window.document.getElementById("code-annotation-line-highlight-gutter");
if (gutterDiv === null) {
gutterDiv = window.document.createElement("div");
gutterDiv.setAttribute("id", "code-annotation-line-highlight-gutter");
gutterDiv.style.position = 'absolute';
const codeCell = window.document.getElementById(targetCell);
const gutter = codeCell.querySelector('.code-annotation-gutter');
gutter.appendChild(gutterDiv);
}
gutterDiv.style.top = top - 2 + "px";
gutterDiv.style.height = height + 4 + "px";
}
selectedAnnoteEl = annoteEl;
}
};
const unselectCodeLines = () => {
const elementsIds = ["code-annotation-line-highlight", "code-annotation-line-highlight-gutter"];
elementsIds.forEach((elId) => {
const div = window.document.getElementById(elId);
if (div) {
div.remove();
}
});
selectedAnnoteEl = undefined;
};
// Attach click handler to the DT
const annoteDls = window.document.querySelectorAll('dt[data-target-cell]');
for (const annoteDlNode of annoteDls) {
annoteDlNode.addEventListener('click', (event) => {
const clickedEl = event.target;
if (clickedEl !== selectedAnnoteEl) {
unselectCodeLines();
const activeEl = window.document.querySelector('dt[data-target-cell].code-annotation-active');
if (activeEl) {
activeEl.classList.remove('code-annotation-active');
}
selectCodeLines(clickedEl);
clickedEl.classList.add('code-annotation-active');
} else {
// Unselect the line
unselectCodeLines();
clickedEl.classList.remove('code-annotation-active');
}
});
}
const findCites = (el) => {
const parentEl = el.parentElement;
if (parentEl) {
const cites = parentEl.dataset.cites;
if (cites) {
return {
el,
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