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beamer-reveal-example_files/libs/revealjs/plugin/quarto-line-highlight/line-highlight.js  view on Meta::CPAN

  function isPrintView() {
    return /print-pdf/gi.test(window.location.search) || /view=print/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(kCodeLineNumbersAttr);
        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);