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rewrite.js
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/* Miscellaneous JS functions which run after the page loads to rewrite or adjust parts of the page. */
/* author: Said Achmiz */
/* license: MIT */
/*************/
/* CLIPBOARD */
/*************/
/*******************************************/
/* Set up copy processors in main document.
*/
doWhenDOMContentLoaded(() => {
registerCopyProcessorsForDocument(document);
});
/*************/
/* AUX-LINKS */
/*************/
/*************************************************************************/
/* Add “backlinks” link to start of section popups, when that section has
a backlinks block.
*/
addContentInjectHandler(GW.contentInjectHandlers.injectBacklinksLinkIntoLocalSectionPopFrame = (eventInfo) => {
GWLog("injectBacklinksLinkIntoLocalSectionPopFrame", "rewrite.js", 1);
let containingPopFrame = Extracts.popFrameProvider.containingPopFrame(eventInfo.container);
if ( containingPopFrame.classList.contains("local-page") == true
&& containingPopFrame.classList.contains("full-page") == false) {
let section = eventInfo.container.querySelector("section");
if (section == null)
return;
let backlinksBlock = eventInfo.container.querySelector(`#${(CSS.escape(section.id))}-backlinks`);
if (backlinksBlock == null)
return;
// Construct link and enclosing block.
let backlinksLink = newElement("A", {
"class": "aux-links backlinks",
"href": "#" + backlinksBlock.id,
"data-link-icon": "arrows-pointing-inwards-to-dot",
"data-link-icon-type": "svg"
}, {
"innerHTML": "backlinks"
});
let sectionMetadataBlock = newElement("P", {
"class": "section-metadata"
});
sectionMetadataBlock.append(backlinksLink);
section.insertBefore(sectionMetadataBlock, section.children[1]);
// Make a click on the link uncollapse the backlinks block.
backlinksLink.addActivateEvent((event) => {
if (isWithinCollapsedBlock(backlinksBlock)) {
GW.notificationCenter.addHandlerForEvent("Collapse.collapseStateDidChange", (info) => {
revealElement(backlinksBlock);
}, {
once: true,
condition: (isWithinCollapsedBlock(backlinksBlock) == false)
});
} else {
requestAnimationFrame(() => {
revealElement(backlinksBlock);
});
}
});
}
}, "rewrite", (info) => (info.context == "popFrame"));
/**************************************************************************/
/* Remove aux-links list labels when transcluding aux-links lists into the
aux-links sections of a page (Backlinks, Similars, Bibliography).
*/
addContentInjectHandler(GW.contentInjectHandlers.removeAuxLinksListLabelsInAuxLinksSections = (eventInfo) => {
GWLog("removeAuxLinksListLabelsInAuxLinksSections", "rewrite.js", 1);
let auxLinksTypes = [
"backlinks",
"similars",
"link-bibliography"
];
let auxLinksListLabelSelector = auxLinksTypes.map(auxLinksType =>
`#${auxLinksType} > .aux-links-list-label, #${auxLinksType} > .columns > .aux-links-list-label`
).join(", ");
let auxLinksListLabel = eventInfo.container.querySelector(auxLinksListLabelSelector);
if (auxLinksListLabel)
auxLinksListLabel.remove();
}, "rewrite", (info) => (info.source == "transclude"));
/*********/
/* LISTS */
/*********/
GW.layout.orderedListTypes = [
"decimal",
"lower-alpha",
"upper-alpha",
"lower-roman",
"upper-roman",
"lower-greek"
];
/*****************************************************************************/
/* Returns the type (CSS `list-item` counter value type) of an <ol> element.
*/
function orderedListType(list) {
if (list?.tagName != "OL")
return null;
for (let type of GW.layout.orderedListTypes)
if (list.classList.contains(`list-type-${type}`))
return type;
return null;
}
/************************************************************************/
/* Sets the type (CSS `list-item` counter value type) of an <ol> element.
*/
function setOrderedListType(list, type) {
if (list?.tagName != "OL")
return;
for (let type of GW.layout.orderedListTypes)
list.classList.remove(`list-type-${type}`);
list.classList.add(`list-type-${type}`);
}
/*******************************************************************/
/* Returns the nesting level (an integer in [1,listCyclePeriod]) of
a <ul> element.
*/
function unorderedListLevel(list) {
if (list?.tagName != "UL")
return 0;
let prefix = "list-level-";
return (parseInt(Array.from(list.classList).find(c => c.startsWith(prefix))?.slice(prefix.length)) || 1);
}
/***********************************************************/
/* Sets CSS class matching nesting level of a <ul> element.
*/
function setUnorderedListLevel(list, level) {
if (list?.tagName != "UL")
return;
let prefix = "list-level-";
list.swapClasses([ Array.from(list.classList).find(c => c.startsWith(prefix)), `${prefix}${level}` ], 1);
}
/***********************************/
/* Designate list type via a class.
*/
addContentInjectHandler(GW.contentInjectHandlers.designateListTypes = (eventInfo) => {
GWLog("designateListTypes", "rewrite.js", 1);
// Workaround for case-insensitivity of CSS selectors.
eventInfo.container.querySelectorAll("ol[type]").forEach(list => {
switch (list.type) {
case '1':
setOrderedListType(list, "decimal");
break;
case 'a':
setOrderedListType(list, "lower-alpha");
break;
case 'A':
setOrderedListType(list, "upper-alpha");
break;
case 'i':
setOrderedListType(list, "lower-roman");
break;
case 'I':
setOrderedListType(list, "upper-roman");
break;
case 'α':
setOrderedListType(list, "lower-greek");
break;
default:
break;
}
});
// If not explicitly specified, cycle between these three list types.
eventInfo.container.querySelectorAll("ol:not([type])").forEach(list => {
let enclosingList = list.parentElement?.closest("ol");
let enclosingListType = enclosingList?.parentElement?.matches("section#footnotes")
? null
: orderedListType(enclosingList);
switch (enclosingListType) {
case "decimal":
setOrderedListType(list, "upper-roman");
break;
case "upper-roman":
setOrderedListType(list, "lower-alpha");
break;
case "lower-alpha":
default:
setOrderedListType(list, "decimal");
break;
}
});
// Set list levels.
let listCyclePeriod = 3;
eventInfo.container.querySelectorAll("ul").forEach(list => {
setUnorderedListLevel(list, (unorderedListLevel(list.parentElement?.closest("ul")) % listCyclePeriod) + 1);
});
}, ">rewrite");
/*****************************************************************/
/* Wrap text nodes and inline elements in list items in <p> tags.
*/
addContentLoadHandler(GW.contentLoadHandlers.paragraphizeListTextNodes = (eventInfo) => {
GWLog("paragraphizeListTextNodes", "rewrite.js", 1);
eventInfo.container.querySelectorAll("li").forEach(listItem => {
if (listItem.closest(".TOC"))
return;
paragraphizeTextNodesOfElementRetainingMetadata(listItem);
});
}, "rewrite");
/**********************************************/
/* Rectify styling/structure of list headings.
*/
addContentLoadHandler(GW.contentLoadHandlers.rectifyListHeadings = (eventInfo) => {
GWLog("rectifyListHeadings", "rewrite.js", 1);
eventInfo.container.querySelectorAll("p > strong:only-child").forEach(boldElement => {
if ( boldElement.parentElement.childNodes.length == 2
&& boldElement.parentElement.firstChild == boldElement
&& boldElement.parentElement.lastChild.nodeType == Node.TEXT_NODE
&& boldElement.parentElement.lastChild.nodeValue == ":") {
boldElement.parentElement.lastChild.remove();
boldElement.lastTextNode.nodeValue += ":";
}
});
}, "rewrite");
/***************/
/* BLOCKQUOTES */
/***************/
/*************************************************************************/
/* Returns the nesting level (an integer in [1,blockquoteCyclePeriod]) of
a <blockquote> element.
*/
function blockquoteLevel(blockquote) {
if (blockquote?.tagName != "BLOCKQUOTE")
return 0;
let prefix = "blockquote-level-";
return (parseInt(Array.from(blockquote.classList).find(c => c.startsWith(prefix))?.slice(prefix.length)) || 1);
}
/*******************************************************************/
/* Sets CSS class matching nesting level of a <blockquote> element.
*/
function setBlockquoteLevel(blockquote, level) {
if (blockquote?.tagName != "BLOCKQUOTE")
return;
let prefix = "blockquote-level-";
blockquote.swapClasses([ Array.from(blockquote.classList).find(c => c.startsWith(prefix)), `${prefix}${level}` ], 1);
}
/******************************************/
/* Designate blockquote level via a class.
*/
addContentInjectHandler(GW.contentInjectHandlers.designateBlockquoteLevels = (eventInfo) => {
GWLog("designateBlockquoteLevels", "rewrite.js", 1);
let blockquoteCyclePeriod = 6;
eventInfo.container.querySelectorAll("blockquote").forEach(blockquote => {
setBlockquoteLevel(blockquote, (blockquoteLevel(blockquote.parentElement?.closest("blockquote")) % blockquoteCyclePeriod) + 1);
});
}, ">rewrite");
/**********/
/* TABLES */
/**********/
/**********************************************/
/* Remove Pandoc-inserted <colgroup> elements.
*/
addContentLoadHandler(GW.contentLoadHandlers.deleteColgroups = (eventInfo) => {
GWLog("deleteColgroups", "rewrite.js", 1);
eventInfo.container.querySelectorAll("colgroup").forEach(colgroup => {
colgroup.remove();
});
}, "rewrite");
/**************************************************************************/
/* If there are tables, import tablesorter.js (if need be) and make tables
sortable.
*/
addContentInjectHandler(GW.contentInjectHandlers.makeTablesSortable = (eventInfo) => {
GWLog("makeTablesSortable", "rewrite.js", 1);
if (eventInfo.container.querySelector("table") == null)
return;
// Import tablesorter.js, if need be.
let scriptTag = document.querySelector("script[src*='/static/js/tablesorter.js']");
if (scriptTag == null) {
scriptTag = newElement("SCRIPT", {
"type": "text/javascript",
"src": "/static/js/tablesorter.js"
});
document.body.appendChild(scriptTag);
}
let sortTables = (eventInfo) => {
jQuery(".table:not(.table-sort-not) table", eventInfo.document).tablesorter();
};
if (window["jQuery"]) {
sortTables(eventInfo);
} else {
GW.notificationCenter.addHandlerForEvent("Tablesorter.didLoad", (info) => {
sortTables(eventInfo);
}, { once: true });
}
}, ">rewrite");
/************************************************************************/
/* Wrap each table in a div.table-wrapper and a div.table-scroll-wrapper
(for layout purposes).
*/
addContentLoadHandler(GW.contentLoadHandlers.wrapTables = (eventInfo) => {
GWLog("wrapTables", "rewrite.js", 1);
wrapAll("table", ".table-wrapper", {
useExistingWrapper: true,
root: eventInfo.container
});
wrapAll("table", ".table-scroll-wrapper", {
useExistingWrapper: false,
root: eventInfo.container
});
/* Move .width-full class from the outer .table-wrapper down to the inner
.table-scroll-wrapper. (This is done so that the `wrapFullWidthTables`
content inject handler may work properly.)
*/
eventInfo.container.querySelectorAll(".table-scroll-wrapper").forEach(tableScrollWrapper => {
let tableWrapper = tableScrollWrapper.closest(".table-wrapper");
transferClasses(tableWrapper, tableScrollWrapper, [ "width-full" ]);
});
}, "rewrite");
/****************************************************/
/* Rectify full-width table wrapper class structure:
div.table-wrapper.table.width-full
div.table-scroll-wrapper
table
or
div.table-wrapper.collapse
div.collapse-content-wrapper.table.width-full
div.table-scroll-wrapper
table
*/
addContentInjectHandler(GW.contentInjectHandlers.rectifyFullWidthTableWrapperStructure = (eventInfo) => {
GWLog("rectifyFullWidthTableWrapperStructure", "rewrite.js", 1);
wrapAll(".table-scroll-wrapper.width-full", ".table", {
useExistingWrapper: true,
moveClasses: [ "width-full" ],
root: eventInfo.container
});
}, "rewrite", (info) => info.fullWidthPossible);
/***********/
/* FIGURES */
/***********/
/******************************************************************************/
/* Add observers to transform thumbnails into full-sized images if page layout
demands it.
*/
addContentInjectHandler(GW.contentInjectHandlers.addSwapOutThumbnailEvents = (eventInfo) => {
GWLog("addSwapOutThumbnailEvents", "rewrite.js", 1);
eventInfo.container.querySelectorAll("img[data-src-size-full]").forEach(image => {
let thumbnailSize = Images.thumbnailSizeFromURL(image.src);
lazyLoadObserver(() => {
resizeObserver(() => {
if (thumbnailSize < image.clientWidth * window.devicePixelRatio) {
Images.unthumbnailifyImage(image);
return false;
} else if (Images.isThumbnail(image) == false) {
return false;
}
}, image);
}, image, {
root: scrollContainerOf(image),
rootMargin: "100%"
});
});
}, "eventListeners");
/******************************************************************************/
/* Request image inversion and outlining judgments for images in the loaded
content. (We omit from this load handler those GW.contentDidLoad events
which are fired when we construct templated content from already extracted
reference data, as by then it is already too late; there is no time to send
an invertOrNot / outlineOrNot API request and receive a response, before
the image must be displayed. Instead, requesting inversion and outlining
judgments for images in templated content is handled by the data source
object for that content (either Content, in content.js, or Annotations, in
annotations.js).)
*/
addContentLoadHandler(GW.contentLoadHandlers.requestImageInversionJudgments = (eventInfo) => {
GWLog("requestImageInversionJudgments", "rewrite.js", 1);
// Request image inversion judgments from invertOrNot.
requestImageInversionJudgmentsForImagesInContainer(eventInfo.container);
// Request image outlining judgments from outlineOrNot.
requestImageOutliningJudgmentsForImagesInContainer(eventInfo.container);
}, ">rewrite", (info) => (info.source != "transclude"));
/*****************************************************************************/
/* Apply image inversion judgment, if one is available, to the given image;
otherwise, add a handler to apply a judgment that becomes available later.
*/
function applyImageInversionJudgmentNowOrLater(image) {
if ( applyImageInversionJudgment(image) == false
&& image.inversionJudgmentAvailabilityHandler == null) {
/* If no inversion judgment has been applied, there may yet be hope
for this image; add another listener to wait for additional
image inversion judgments to become available in the future.
*/
GW.notificationCenter.addHandlerForEvent("GW.imageInversionJudgmentsAvailable", image.inversionJudgmentAvailabilityHandler = (info) => {
if (applyImageInversionJudgment(image)) {
GW.notificationCenter.removeHandlerForEvent("GW.imageInversionJudgmentsAvailable", image.inversionJudgmentAvailabilityHandler);
image.inversionJudgmentAvailabilityHandler = null;
}
});
}
}
/*****************************************************************************/
/* Apply image outlining judgment, if one is available, to the given image;
otherwise, add a handler to apply a judgment that becomes available later.
*/
function applyImageOutliningJudgmentNowOrLater(image) {
let propagateClassesToFigure = (image) => {
image.closest("figure").swapClasses([ "outline-not", "outline" ], outliningJudgmentForImage(image) ? 1 : 0);
};
if (applyImageOutliningJudgment(image)) {
propagateClassesToFigure(image);
} else if ( outliningJudgmentHasBeenAppliedToImage(image) == false
&& image.outliningJudgmentAvailabilityHandler == null) {
/* If no outlining judgment has been applied, there may yet be hope
for this image; add another listener to wait for additional
image outlining judgments to become available in the future.
*/
GW.notificationCenter.addHandlerForEvent("GW.imageOutliningJudgmentsAvailable", image.outliningJudgmentAvailabilityHandler = (info) => {
if (applyImageOutliningJudgment(image)) {
propagateClassesToFigure(image);
GW.notificationCenter.removeHandlerForEvent("GW.imageOutliningJudgmentsAvailable", image.outliningJudgmentAvailabilityHandler);
image.outliningJudgmentAvailabilityHandler = null;
}
});
}
}
/***************************************************************************/
/* Apply image inversion judgments (received from the invertOrNot API) and
image outlining judgments (received from the outlineOrNot API) to images
in the loaded content, if available.
*/
addContentInjectHandler(GW.contentInjectHandlers.applyImageInversionAndOutliningJudgments = (eventInfo) => {
GWLog("applyImageInversionAndOutliningJudgments", "rewrite.js", 1);
eventInfo.container.querySelectorAll("figure img").forEach(applyImageInversionJudgmentNowOrLater);
eventInfo.container.querySelectorAll("figure img").forEach(applyImageOutliningJudgmentNowOrLater);
}, "rewrite");
/******************************************************************/
/* Wrap text nodes and inline elements in figcaptions in <p> tags.
*/
addContentLoadHandler(GW.contentLoadHandlers.paragraphizeFigcaptionTextNodes = (eventInfo) => {
GWLog("paragraphizeFigcaptionTextNodes", "rewrite.js", 1);
eventInfo.container.querySelectorAll("figcaption").forEach(paragraphizeTextNodesOfElementRetainingMetadata);
}, "rewrite");
/***************************************************************************/
/* Make sure that the figcaption, alt-text, and title are, collectively, as
useful as possible (i.e., ensure that neither the alt-text nor the title
duplicate the contents of the figcaption).
*/
addContentLoadHandler(GW.contentLoadHandlers.rectifyImageAuxText = (eventInfo) => {
GWLog("rectifyImageAuxText", "rewrite.js", 1);
eventInfo.container.querySelectorAll("figure img").forEach(image => {
let figcaption = image.closest("figure").querySelector("figcaption");
if (figcaption == null)
return;
let [ captionText, titleText, altText ] = [
figcaption.cloneNode(true),
newElement("SPAN", null, { "innerHTML": image.getAttribute("title") }),
newElement("SPAN", null, { "innerHTML": image.getAttribute("alt") }),
].map(element => {
if (element)
Typography.processElement(element, Typography.replacementTypes.CLEAN|Typography.replacementTypes.QUOTES);
return element.textContent.trim();
});
/* If the ‘title’ attribute merely duplicates the caption, but the
‘alt’ attribute has something different (and nonempty), then copy
the ‘alt’ to the ‘title’.
*/
if ( titleText == captionText
&& altText != captionText
&& altText > "")
image.title = altText;
/* As above, but vice-versa (copy ‘title’ to ‘alt’, if appropriate).
*/
if ( altText == captionText
&& titleText != captionText
&& titleText > "")
image.alt = titleText;
});
}, "rewrite");
/*******************************/
/* Wrap bare images in figures.
*/
addContentLoadHandler(GW.contentLoadHandlers.wrapImages = (eventInfo) => {
GWLog("wrapImages", "rewrite.js", 1);
eventInfo.container.querySelectorAll("p > img:only-child").forEach(image => {
unwrap(image.parentElement);
});
let exclusionSelector = [
"td",
"th",
".footnote-back"
].join(", ");
wrapAll("img", (image) => {
if ( image.classList.contains("figure-not")
|| image.closest(exclusionSelector) != null
|| image.closest("figure") != null)
return;
wrapElement(image, "figure");
}, {
root: eventInfo.container
});
}, "rewrite");
/*****************************************************************************/
/* Inject the page thumbnail image into the page abstract (or the abstract of
a full-page pop-frame.
*/
addContentInjectHandler(GW.contentInjectHandlers.injectThumbnailIntoPageAbstract = (eventInfo) => {
GWLog("injectThumbnailIntoPageAbstract", "rewrite.js", 1);
let pageAbstract = eventInfo.container.querySelector(".abstract blockquote");
if ( pageAbstract == null
|| previousBlockOf(pageAbstract) != null)
return;
// Designate page abstract.
pageAbstract.classList.add("page-abstract");
if (pageAbstract.querySelector(".page-thumbnail-figure") != null)
return;
// Insert page thumbnail into page abstract.
let referenceData = Content.referenceDataForLink(newElement("A", { href: eventInfo.loadLocation.href }));
if (referenceData.pageThumbnailHTML != null) {
let pageThumbnailFigure = pageAbstract.insertBefore(newElement("FIGURE", {
class: "page-thumbnail-figure " + (eventInfo.context == "popFrame" ? "float-right" : "float-not")
}, {
innerHTML: referenceData.pageThumbnailHTML
}), (eventInfo.context == "popFrame"
? pageAbstract.firstElementChild
: null));
let pageThumbnail = pageThumbnailFigure.querySelector("img");
wrapElement(pageThumbnail, "span.image-wrapper.img");
if (eventInfo.context == "popFrame")
Images.thumbnailifyImage(pageThumbnail);
// Invert, or not.
applyImageInversionJudgmentNowOrLater(pageThumbnail);
}
}, "rewrite", (info) => ( info.container == document.main
|| ( info.context == "popFrame"
&& Extracts.popFrameProvider == Popups
&& Extracts.popFrameProvider.containingPopFrame(info.container).classList.contains("full-page"))));
/******************************************************************************/
/* Set, in CSS, the media (image/video) dimensions that are specified in HTML.
*/
function setMediaElementDimensions(mediaElement, fixWidth = false, fixHeight = false) {
let width = mediaElement.getAttribute("width");
let height = mediaElement.getAttribute("height");
mediaElement.style.aspectRatio = mediaElement.dataset.aspectRatio ?? `${width} / ${height}`;
if (mediaElement.maxHeight == null) {
// This should match `1rem`.
let baseFontSize = GW.isMobile() ? "18" : "20";
/* This should match the `max-height` property value for all images in
figures (the `figure img` selector; see initial.css).
*/
mediaElement.maxHeight = window.innerHeight - (8 * baseFontSize);
}
if (mediaElement.maxHeight)
width = Math.round(Math.min(width, mediaElement.maxHeight * (width/height)));
if (fixWidth) {
mediaElement.style.width = `${width}px`;
}
if (fixHeight) {
// Nothing, for now.
}
}
GW.dimensionSpecifiedMediaElementSelector = [
"img[width][height]:not([src$='.svg'])",
"video[width][height]"
].map(x => `figure ${x}`).join(", ");
/**************************************************************/
/* Prevent reflow for floats, reduce reflow for other figures.
*/
addContentLoadHandler(GW.contentLoadHandlers.setMediaElementDimensions = (eventInfo) => {
GWLog("setMediaElementDimensions", "rewrite.js", 1);
// Set specified dimensions in CSS.
eventInfo.container.querySelectorAll(GW.dimensionSpecifiedMediaElementSelector).forEach(mediaElement => {
let fixWidth = ( mediaElement.classList.containsAnyOf([ "float-left", "float-right" ])
|| mediaElement.closest("figure")?.classList.containsAnyOf([ "float-left", "float-right" ]));
setMediaElementDimensions(mediaElement, fixWidth);
});
// Also ensure that SVGs get rendered as big as possible.
eventInfo.container.querySelectorAll("figure img[src$='.svg']").forEach(svg => {
svg.style.width = "100vw";
svg.style.aspectRatio = svg.dataset.aspectRatio;
});
}, "rewrite");
/************************************************************/
/* Prevent reflow due to lazy-loaded media (images, videos).
*/
addContentInjectHandler(GW.contentInjectHandlers.updateMediaElementDimensions = (eventInfo) => {
GWLog("updateMediaElementDimensions", "rewrite.js", 1);
eventInfo.container.querySelectorAll(GW.dimensionSpecifiedMediaElementSelector).forEach(mediaElement => {
setMediaElementDimensions(mediaElement, true);
});
}, "rewrite", (info) => ( info.context == "popFrame"
&& Extracts.popFrameProvider.containingPopFrame(info.container).classList.contains("object")) == false);
/************************************************************************/
/* Set image dimensions from inline-specified image data (e.g., base64).
*/
addContentInjectHandler(GW.contentInjectHandlers.setImageDimensionsFromImageData = (eventInfo) => {
GWLog("setImageDimensionsFromImageData", "rewrite.js", 1);
/* If an image doesn’t have dimensions set, but image data is already
available (because the source is a data: URI), we can determine
dimensions once the image “loads” (i.e., ‘load’ event fires, when
browser parses the data: attribute).
*/
eventInfo.container.querySelectorAll("figure img:not([width])").forEach(image => {
if (image.loadHandler)
return;
image.addEventListener("load", image.loadHandler = (event) => {
image.setAttribute("width", image.naturalWidth);
image.setAttribute("height", image.naturalHeight);
image.setAttribute("data-aspect-ratio", `${image.naturalWidth} / ${image.naturalHeight}`);
setMediaElementDimensions(image);
// Ensure proper interaction with image-focus.
if (image.classList.contains("focusable"))
ImageFocus.designateSmallImageIfNeeded(image);
}, { once: true });
});
}, "eventListeners");
/************************************************************************/
/* Ensure media (image, video) dimensions update when device is rotated.
*/
addContentInjectHandler(GW.contentInjectHandlers.addOrientationChangeMediaElementDimensionUpdateEvents = (eventInfo) => {
GWLog("addOrientationChangeMediaElementDimensionUpdateEvents", "rewrite.js", 1);
let mediaElements = eventInfo.container.querySelectorAll(GW.dimensionSpecifiedMediaElementSelector);
doWhenMatchMedia(GW.mediaQueries.portraitOrientation, "Rewrite.updateMediaElementDimensionsWhenOrientationChanges", (mediaQuery) => {
mediaElements.forEach(mediaElement => {
mediaElement.maxHeight = null;
});
requestAnimationFrame(() => {
mediaElements.forEach(mediaElement => {
mediaElement.style.width = "";
setMediaElementDimensions(mediaElement, true);
});
});
});
}, "eventListeners", (info) => ( info.context == "popFrame"
&& Extracts.popFrameProvider.containingPopFrame(info.container).classList.contains("object")) == false);
/********************************/
/* Inject wrappers into figures.
*/
addContentLoadHandler(GW.contentLoadHandlers.wrapFigures = (eventInfo) => {
GWLog("wrapFigures", "rewrite.js", 1);
let mediaSelector = "img, audio, video";
eventInfo.container.querySelectorAll("figure").forEach(figure => {
let media = figure.querySelector(mediaSelector);
if (media == null)
return;
// Create a wrapper for the figure contents (media plus caption).
let outerWrapper = figure.appendChild(newElement("SPAN", { "class": "figure-outer-wrapper" }));
// Re-insert the (possibly wrapped) media into the figure.
figure.querySelectorAll(mediaSelector).forEach(mediaElement => {
let mediaBlock = ( mediaElement.closest(".image-row-wrapper")
?? mediaElement.closest(".image-wrapper")
?? mediaElement);
outerWrapper.appendChild(mediaBlock);
// Ensure proper wrapping.
if ( mediaBlock == mediaElement
|| ( mediaBlock.matches(".image-wrapper") == false
&& mediaElement.closest(".image-wrapper") == null))
mediaBlock = wrapElement(mediaElement, "span.image-wrapper." + mediaElement.tagName.toLowerCase());
});
// Wrap the caption (if any) in a caption wrapper.
let caption = figure.querySelector("figcaption");
if (caption)
outerWrapper.appendChild(newElement("SPAN", { "class": "caption-wrapper" })).appendChild(caption);
});
}, "rewrite");
/***************************************************************************/
/* Designate whether the media element backdrop should be inverted (back to
a light color) in dark mode.
*/
addContentInjectHandler(GW.contentInjectHandlers.designateImageBackdropInversionStatus = (eventInfo) => {
GWLog("designateImageBackdropInversionStatus", "rewrite.js", 1);
let mediaSelector = _π("figure", " ", [ "img", "audio", "video" ]).join(", ");
eventInfo.container.querySelectorAll(mediaSelector).forEach(mediaElement => {
if (mediaElement.matches("audio")) {
mediaElement.classList.add("dark-mode-invert");
} else {
let wrapper = mediaElement.closest(".image-wrapper");
if (mediaElement.classList.containsAnyOf([ "invert", "invert-auto" ]) == false)
wrapper.classList.add("dark-mode-invert");
}
});
}, ">rewrite");
/******************************************************************************/
/* Figure captions might be empty if they are generated by including the
annotation abstract of an annotated media include link, but the abstract is
actually empty (because it’s a partial annotation).
*/
addContentLoadHandler(GW.contentLoadHandlers.removeEmptyFigureCaptions = (eventInfo) => {
GWLog("removeEmptyFigureCaptions", "rewrite.js", 1);
eventInfo.container.querySelectorAll("figcaption").forEach(figcaption => {
if (isNodeEmpty(figcaption, { alsoExcludeSelector: "a" }))
figcaption.remove();
});
}, "rewrite");
/*****************************************************************************/
/* Allow for specifying figure classes by setting classes on a media element.
*/
addContentLoadHandler(GW.contentLoadHandlers.rectifyFigureClasses = (eventInfo) => {
GWLog("rectifyFigureClasses", "rewrite.js", 1);
let mediaSelector = "img, audio, video";
eventInfo.container.querySelectorAll("figure").forEach(figure => {
let media = figure.querySelector(mediaSelector);
if (media == null)
return;
// Tag the figure with the first (or only) media element’s classes.
[ "float-left", "float-right", "outline-not", "image-focus-not" ].forEach(imgClass => {
if (media.classList.contains(imgClass)) {
figure.classList.add(imgClass);
media.classList.remove(imgClass);
}
});
media.classList.remove("float");
});
}, "rewrite");
/********************************/
/* Don’t float solitary figures.
*/
addContentInjectHandler(GW.contentInjectHandlers.deFloatSolitaryFigures = (eventInfo) => {
GWLog("deFloatSolitaryFigures", "rewrite.js", 1);
let floatClasses = [ "float-left", "float-right" ];
eventInfo.container.querySelectorAll(floatClasses.map(x => `figure.${x}:only-child`).join(", ")).forEach(figure => {
if (isOnlyChild(figure))
figure.classList.remove(...floatClasses);
});
}, "rewrite");
/***********************************************************************/
/* Prepare full-width (class `width-full`) figures; add listeners, etc.
*/
addContentInjectHandler(GW.contentInjectHandlers.prepareFullWidthFigures = (eventInfo) => {
GWLog("prepareFullWidthFigures", "rewrite.js", 1);
let fullWidthClass = "width-full";
let allFullWidthMedia = eventInfo.container.querySelectorAll(`figure img.${fullWidthClass}, figure video.${fullWidthClass}`);
allFullWidthMedia.forEach(fullWidthMedia => {
fullWidthMedia.closest("figure").classList.toggle(fullWidthClass, true);
});
// Constrain caption width to width of media element.
let constrainCaptionWidth = (fullWidthMedia) => {
let caption = fullWidthMedia.closest("figure").querySelector(".caption-wrapper");
if (caption)
caption.style.maxWidth = fullWidthMedia.offsetWidth > 0
? fullWidthMedia.offsetWidth + "px"
: fullWidthMedia.closest(".markdownBody").offsetWidth + "px";
};
// Add ‘load’ listener for lazy-loaded media.
allFullWidthMedia.forEach(fullWidthMedia => {
fullWidthMedia.addEventListener("load", fullWidthMedia.loadListener = (event) => {
constrainCaptionWidth(fullWidthMedia);
fullWidthMedia.loadListener = null;
}, { once: true });
});
doWhenPageLayoutComplete(() => {
/* Update ‘load’ listener for any lazy-loaded media which has not
already loaded (as it might cause re-layout of e.g. sidenotes). Do
this only after page layout is complete, to avoid spurious re-layout
at initial page load.
*/
allFullWidthMedia.forEach(fullWidthMedia => {
constrainCaptionWidth(fullWidthMedia);
if (fullWidthMedia.loadListener) {
fullWidthMedia.removeEventListener("load", fullWidthMedia.loadListener);
fullWidthMedia.addEventListener("load", (event) => {
constrainCaptionWidth(fullWidthMedia);
GW.notificationCenter.fireEvent("Rewrite.fullWidthMediaDidLoad", {
mediaElement: fullWidthMedia
});
}, { once: true });
}
});
// Add listener to update caption max-width when window resizes.
addWindowResizeListener(event => {
allFullWidthMedia.forEach(constrainCaptionWidth);
}, {
name: "constrainFullWidthMediaCaptionWidthOnWindowResizeListener"
});
});
}, "rewrite", (info) => info.fullWidthPossible);
/******************************************************************************/
/* There is no browser native lazy loading for <video> tag `poster` attribute,
so we implement it ourselves.
*/
addContentInjectHandler(GW.contentInjectHandlers.lazyLoadVideoPosters = (eventInfo) => {
GWLog("lazyLoadVideoPosters", "rewrite.js", 1);
eventInfo.container.querySelectorAll("video:not([poster])").forEach(video => {
let videoURL = URLFromString(video.querySelector("source").src);
if (videoURL.hostname == location.hostname)
video.dataset.videoPoster = videoURL.pathname + "-poster.jpg";
if (video.dataset.videoPoster > "") {
lazyLoadObserver(() => {
video.poster = video.dataset.videoPoster;
}, video, {
root: scrollContainerOf(video),
rootMargin: "100%"
});
}
});
}, "eventListeners");
/******************************************************************************/
/* Enable clicking anywhere on a video (that has not yet loaded and started to
play) to load it and start playing it. (Otherwise, only clicking the ‘play’
button causes the video to load and play.)
*/
addContentInjectHandler(GW.contentInjectHandlers.enableVideoClickToPlay = (eventInfo) => {
GWLog("enableVideoClickToPlay", "rewrite.js", 1);
eventInfo.container.querySelectorAll("video").forEach(video => {
video.addEventListener("click", video.clickToPlayEvent = (event) => {
video.play();
video.removeEventListener("click", video.clickToPlayEvent);
video.clickToPlayEvent = null;
});
});
}, "eventListeners");
/****************************************************************/
/* Account for interaction between image-focus.js and popups.js.
*/
if (Extracts.popFrameProvider == Popups) {
GW.notificationCenter.addHandlerForEvent("ImageFocus.imageOverlayDidAppear", (info) => {
Popups.hidePopupContainer();
});
GW.notificationCenter.addHandlerForEvent("ImageFocus.imageOverlayDidDisappear", (info) => {
Popups.unhidePopupContainer();
});
GW.notificationCenter.addHandlerForEvent("ImageFocus.imageDidFocus", (info) => {
/* Pin a popup when clicking to image-focus an image within it
(unless it’s a popup that contains *only* the image, and nothing
else - no metadata, no other content, nothing - in which case,
pinning is unnecessary).
*/
let popup = Popups.containingPopFrame(info.image);
if ( popup
&& ( popup.classList.contains("object")
&& Annotations.isAnnotatedLink(popup.spawningTarget) == false) == false)
Popups.pinPopup(popup);
});
}
/***************/
/* CODE BLOCKS */
/***************/
/*************************************************************/
/* Wrap each <pre> in a div.sourceCode (for layout purposes).
*/
addContentLoadHandler(GW.contentLoadHandlers.wrapPreBlocks = (eventInfo) => {
GWLog("wrapPreBlocks", "rewrite.js", 1);
wrapAll("pre", ".sourceCode", {
useExistingWrapper: true,
root: eventInfo.container
});
}, "rewrite");
/********************************************************/
/* EXPERIMENTAL: Highlight-on-hover for all code blocks.
*/
addContentLoadHandler(GW.contentLoadHandlers.addCodeBlockLineClasses = (eventInfo) => {
GWLog("addCodeBlockLineClasses", "rewrite.js", 1);
eventInfo.container.querySelectorAll("code.sourceCode > span:not(.line)").forEach(lineSpan => {
lineSpan.classList.add("line");
if (lineSpan.innerHTML.length == 0)
lineSpan.innerHTML = " ";
});
eventInfo.container.querySelectorAll("pre code:not(.sourceCode)").forEach(codeBlock => {
codeBlock.innerHTML = codeBlock.innerHTML.split("\n").map(
line => `<span class="line">${(line || " ")}</span>`