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window.QuartoLineHighlight = function () {
function isPrintView() {
return /print-pdf/gi.test(window.location.search);
}
const delimiters = {
step: "|",
line: ",",
lineRange: "-",
};
const regex = new RegExp(
"^[\\d" + Object.values(delimiters).join("") + "]+$"
);
function handleLinesSelector(deck, attr) {
// if we are in printview with pdfSeparateFragments: false
// then we'll also want to supress
if (regex.test(attr)) {
if (isPrintView() && deck.getConfig().pdfSeparateFragments !== true) {
return false;
} else {
return true;
}
} else {
return false;
}
}
const kCodeLineNumbersAttr = "data-code-line-numbers";
const kFragmentIndex = "data-fragment-index";
function initQuartoLineHighlight(deck) {
const divSourceCode = deck
.getRevealElement()
.querySelectorAll("div.sourceCode");
// Process each div created by Pandoc highlighting - numbered line are already included.
divSourceCode.forEach((el) => {
if (el.hasAttribute(kCodeLineNumbersAttr)) {
const codeLineAttr = el.getAttribute(kCodeLineNumbersAttr);
el.removeAttribute("data-code-line-numbers");
if (handleLinesSelector(deck, codeLineAttr)) {
// Only process if attr is a string to select lines to highlights
// e.g "1|3,6|8-11"
const codeBlock = el.querySelectorAll("pre code");
codeBlock.forEach((code) => {
// move attributes on code block
code.setAttribute(kCodeLineNumbersAttr, codeLineAttr);
const scrollState = { currentBlock: code };
// Check if there are steps and duplicate code block accordingly
const highlightSteps = splitLineNumbers(codeLineAttr);
if (highlightSteps.length > 1) {
// If the original code block has a fragment-index,
// each clone should follow in an incremental sequence
let fragmentIndex = parseInt(
code.getAttribute(kFragmentIndex),
10
);
fragmentIndex =
typeof fragmentIndex !== "number" || isNaN(fragmentIndex)
? null
: fragmentIndex;
let stepN = 1;
highlightSteps.slice(1).forEach(
// Generate fragments for all steps except the original block
(step) => {
var fragmentBlock = code.cloneNode(true);
fragmentBlock.setAttribute(
"data-code-line-numbers",
joinLineNumbers([step])
);
fragmentBlock.classList.add("fragment");
// Pandoc sets id on spans we need to keep unique
fragmentBlock
.querySelectorAll(":scope > span")
.forEach((span) => {
if (span.hasAttribute("id")) {
span.setAttribute(
"id",
span.getAttribute("id").concat("-" + stepN)
);
}
});
stepN = ++stepN;
// Add duplicated <code> element after existing one
code.parentNode.appendChild(fragmentBlock);
// Each new <code> element is highlighted based on the new attributes value
highlightCodeBlock(fragmentBlock);
if (typeof fragmentIndex === "number") {
fragmentBlock.setAttribute(kFragmentIndex, fragmentIndex);
fragmentIndex += 1;
} else {
fragmentBlock.removeAttribute(kFragmentIndex);
}
// Scroll highlights into view as we step through them
fragmentBlock.addEventListener(
"visible",
scrollHighlightedLineIntoView.bind(
this,
fragmentBlock,
scrollState
)
);
fragmentBlock.addEventListener(
"hidden",
scrollHighlightedLineIntoView.bind(
this,
fragmentBlock.previousSibling,
scrollState
)
);
}
);
code.removeAttribute(kFragmentIndex);
code.setAttribute(
kCodeLineNumbersAttr,
joinLineNumbers([highlightSteps[0]])
);
}
// Scroll the first highlight into view when the slide becomes visible.
const slide =
typeof code.closest === "function"
? code.closest("section:not(.stack)")
: null;
if (slide) {
const scrollFirstHighlightIntoView = function () {
scrollHighlightedLineIntoView(code, scrollState, true);
slide.removeEventListener(
"visible",
scrollFirstHighlightIntoView
);
};
slide.addEventListener("visible", scrollFirstHighlightIntoView);
}
highlightCodeBlock(code);
});
}
}
});
}
function highlightCodeBlock(codeBlock) {
const highlightSteps = splitLineNumbers(
codeBlock.getAttribute(kCodeLineNumbersAttr)
);
if (highlightSteps.length) {
// If we have at least one step, we generate fragments
highlightSteps[0].forEach((highlight) => {
// Add expected class on <pre> for reveal CSS
codeBlock.parentNode.classList.add("code-wrapper");
// Select lines to highlight
spanToHighlight = [];
if (typeof highlight.last === "number") {
spanToHighlight = [].slice.call(
codeBlock.querySelectorAll(
":scope > span:nth-child(n+" +
highlight.first +
"):nth-child(-n+" +
highlight.last +
")"
)
);
} else if (typeof highlight.first === "number") {
spanToHighlight = [].slice.call(
codeBlock.querySelectorAll(
":scope > span:nth-child(" + highlight.first + ")"
)
);
}
if (spanToHighlight.length) {
// Add a class on <code> and <span> to select line to highlight
spanToHighlight.forEach((span) =>
span.classList.add("highlight-line")
);
codeBlock.classList.add("has-line-highlights");
}
});
}
}
/**
* Animates scrolling to the first highlighted line
* in the given code block.
*/
function scrollHighlightedLineIntoView(block, scrollState, skipAnimation) {
window.cancelAnimationFrame(scrollState.animationFrameID);
// Match the scroll position of the currently visible
// code block
if (scrollState.currentBlock) {
block.scrollTop = scrollState.currentBlock.scrollTop;
}
// Remember the current code block so that we can match
// its scroll position when showing/hiding fragments
scrollState.currentBlock = block;
const highlightBounds = getHighlightedLineBounds(block);
let viewportHeight = block.offsetHeight;
// Subtract padding from the viewport height
const blockStyles = window.getComputedStyle(block);
viewportHeight -=
parseInt(blockStyles.paddingTop) + parseInt(blockStyles.paddingBottom);
// Scroll position which centers all highlights
const startTop = block.scrollTop;
let targetTop =
highlightBounds.top +
(Math.min(highlightBounds.bottom - highlightBounds.top, viewportHeight) -
viewportHeight) /
2;
// Make sure the scroll target is within bounds
targetTop = Math.max(
Math.min(targetTop, block.scrollHeight - viewportHeight),
0
);
if (skipAnimation === true || startTop === targetTop) {
block.scrollTop = targetTop;
} else {
// Don't attempt to scroll if there is no overflow
if (block.scrollHeight <= viewportHeight) return;
let time = 0;
const animate = function () {
time = Math.min(time + 0.02, 1);
// Update our eased scroll position
block.scrollTop =
startTop + (targetTop - startTop) * easeInOutQuart(time);
// Keep animating unless we've reached the end
if (time < 1) {
scrollState.animationFrameID = requestAnimationFrame(animate);
}
};
animate();
}
}
function getHighlightedLineBounds(block) {
const highlightedLines = block.querySelectorAll(".highlight-line");
if (highlightedLines.length === 0) {
return { top: 0, bottom: 0 };
} else {
const firstHighlight = highlightedLines[0];
const lastHighlight = highlightedLines[highlightedLines.length - 1];
return {
top: firstHighlight.offsetTop,
bottom: lastHighlight.offsetTop + lastHighlight.offsetHeight,
};
}
}
/**
* The easing function used when scrolling.
*/
function easeInOutQuart(t) {
// easeInOutQuart
return t < 0.5 ? 8 * t * t * t * t : 1 - 8 * --t * t * t * t;
}
function splitLineNumbers(lineNumbersAttr) {
// remove space
lineNumbersAttr = lineNumbersAttr.replace("/s/g", "");
// seperate steps (for fragment)
lineNumbersAttr = lineNumbersAttr.split(delimiters.step);
// for each step, calculate first and last line, if any
return lineNumbersAttr.map((highlights) => {
// detect lines
const lines = highlights.split(delimiters.line);
return lines.map((range) => {
if (/^[\d-]+$/.test(range)) {
range = range.split(delimiters.lineRange);
const firstLine = parseInt(range[0], 10);
const lastLine = range[1] ? parseInt(range[1], 10) : undefined;
return {
first: firstLine,
last: lastLine,
};
} else {
return {};
}
});
});
}
function joinLineNumbers(splittedLineNumbers) {
return splittedLineNumbers
.map(function (highlights) {
return highlights
.map(function (highlight) {
// Line range
if (typeof highlight.last === "number") {
return highlight.first + delimiters.lineRange + highlight.last;
}
// Single line
else if (typeof highlight.first === "number") {
return highlight.first;
}
// All lines
else {
return "";
}
})
.join(delimiters.line);
})
.join(delimiters.step);
}
return {
id: "quarto-line-highlight",
init: function (deck) {
initQuartoLineHighlight(deck);
// If we're printing to PDF, scroll the code highlights of
// all blocks in the deck into view at once
deck.on("pdf-ready", function () {
[].slice
.call(
deck
.getRevealElement()
.querySelectorAll(
"pre code[data-code-line-numbers].current-fragment"
)
)
.forEach(function (block) {
scrollHighlightedLineIntoView(block, {}, true);
});
});
},
};
};
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