hugo-theme-relearn/js/theme.js

window.relearn = window.relearn || {};

var theme = true;
var isIE = /*@cc_on!@*/false || !!document.documentMode;
if( isIE ){
    // we don't support sidebar flyout in IE
    document.querySelector( 'body' ).classList.remove( 'mobile-support' );
}
else{
    document.querySelector( 'body' ).classList.add( 'mobile-support' );
}

var isPrint = document.querySelector( 'body' ).classList.contains( 'print' );

var isRtl = document.querySelector( 'html' ).getAttribute( 'dir' ) == 'rtl';
var dir_padding_start = 'padding-left';
var dir_padding_end = 'padding-right';
var dir_key_start = 37;
var dir_key_end = 39;
var dir_scroll = 1;
if( isRtl && !isIE ){
    dir_padding_start = 'padding-right';
    dir_padding_end = 'padding-left';
    dir_key_start = 39;
    dir_key_end = 37;
    dir_scroll = -1;
}

var touchsupport = ('ontouchstart' in window) || (navigator.maxTouchPoints > 0) || (navigator.msMaxTouchPoints > 0)

var formelements = 'button, datalist, fieldset, input, label, legend, meter, optgroup, option, output, progress, select, textarea';

// PerfectScrollbar
var psc;
var psm;
var pst;
var elc = document.querySelector('#body-inner');

function documentFocus(){
    elc.focus();
    psc && psc.scrollbarY.focus();
}

function scrollbarWidth(){
    // https://davidwalsh.name/detect-scrollbar-width
    // Create the measurement node
    var scrollDiv = document.createElement("div");
    scrollDiv.className = "scrollbar-measure";
    document.body.appendChild(scrollDiv);
    // Get the scrollbar width
    var scrollbarWidth = scrollDiv.offsetWidth - scrollDiv.clientWidth;
    // Delete the DIV
    document.body.removeChild(scrollDiv);
    return scrollbarWidth;
}

var scrollbarSize = scrollbarWidth();
function adjustContentWidth(){
    var start = parseFloat( getComputedStyle( elc ).getPropertyValue( dir_padding_start ) );
    var end = start;
    if( elc.scrollHeight > elc.clientHeight ){
        // if we have a scrollbar reduce the end margin by the scrollbar width
        end = Math.max( 0, start - scrollbarSize );
    }
    elc.style[ dir_padding_end ] = '' + end + 'px';
}

function fixCodeTabs(){
    /* if only a single code block is contained in the tab and no style was selected, treat it like style=code */
    var codeTabContents = Array.from( document.querySelectorAll( '.tab-content.tab-panel-style' ) ).filter( function( tabContent ){
        return tabContent.querySelector( '*:scope > .tab-content-text > div.highlight:only-child, *:scope > .tab-content-text > pre.pre-code:only-child');
    });

    codeTabContents.forEach( function( tabContent ){
        var tabId = tabContent.dataset.tabItem;
        var tabPanel = tabContent.parentNode.parentNode;
        var tabButton = tabPanel.querySelector( '.tab-nav-button.tab-panel-style[data-tab-item="'+tabId+'"]' );
        if( tabContent.classList.contains( 'initial' ) ){
            tabButton.classList.remove( 'initial' );
            tabButton.classList.add( 'code' );
            tabContent.classList.remove( 'initial' );
            tabContent.classList.add( 'code' );
        }
        // mark code blocks for FF without :has()
        tabContent.classList.add( 'codify' );
    });
}

function switchTab(tabGroup, tabId) {
    var tabs = Array.from( document.querySelectorAll( '.tab-panel[data-tab-group="'+tabGroup+'"]' ) ).filter( function( e ){
        return !!e.querySelector( '[data-tab-item="'+tabId+'"]' );
    });
    var allTabItems = tabs && tabs.reduce( function( a, e ){
        return a.concat( Array.from( e.querySelectorAll( '[data-tab-item]' ) ).filter( function( es ){
            return es.parentNode.parentNode == e;
        }) );
    }, [] );
    var targetTabItems = tabs && tabs.reduce( function( a, e ){
        return a.concat( Array.from( e.querySelectorAll( '[data-tab-item="'+tabId+'"]' ) ).filter( function( es ){
            return es.parentNode.parentNode == e;
        }) );
    }, [] );

    // if event is undefined then switchTab was called from restoreTabSelection
    // so it's not a button event and we don't need to safe the selction or
    // prevent page jump
    var isButtonEvent = event && event.target && event.target.getBoundingClientRect;
    if(isButtonEvent){
      // save button position relative to viewport
      var yposButton = event.target.getBoundingClientRect().top;
    }

    allTabItems && allTabItems.forEach( function( e ){ e.classList.remove( 'active' ); });
    targetTabItems && targetTabItems.forEach( function( e ){ e.classList.add( 'active' ); });

    if(isButtonEvent){
      // reset screen to the same position relative to clicked button to prevent page jump
      var yposButtonDiff = event.target.getBoundingClientRect().top - yposButton;
      window.scrollTo(window.scrollX, window.scrollY+yposButtonDiff);

      // Store the selection to make it persistent
      if(window.localStorage){
          var selectionsJSON = window.localStorage.getItem(baseUriFull+"tab-selections");
          if(selectionsJSON){
            var tabSelections = JSON.parse(selectionsJSON);
          }else{
            var tabSelections = {};
          }
          tabSelections[tabGroup] = tabId;
          window.localStorage.setItem(baseUriFull+"tab-selections", JSON.stringify(tabSelections));
      }
    }
}

function restoreTabSelections() {
    if(window.localStorage){
        var selectionsJSON = window.localStorage.getItem(baseUriFull+"tab-selections");
        if(selectionsJSON){
          var tabSelections = JSON.parse(selectionsJSON);
        }else{
          var tabSelections = {};
        }
        Object.keys(tabSelections).forEach(function(tabGroup) {
          var tabItem = tabSelections[tabGroup];
          switchTab(tabGroup, tabItem);
        });
    }
}

function initMermaid( update, attrs ) {
    // we are either in update or initialization mode;
    // during initialization, we want to edit the DOM;
    // during update we only want to execute if something changed
    var decodeHTML = function( html ){
        var txt = document.createElement( 'textarea' );
        txt.innerHTML = html;
        return txt.value;
    };

    var parseGraph = function( graph ){
        // See https://github.com/mermaid-js/mermaid/blob/9a080bb975b03b2b1d4ef6b7927d09e6b6b62760/packages/mermaid/src/diagram-api/frontmatter.ts#L10
        // for reference on the regex originally taken from jekyll
        var YAML=1;
        var INIT=2;
        var GRAPH=3;
        var d = /^(?:\s*[\n\r])*(-{3}\s*[\n\r](?:.*?)[\n\r]-{3}(?:\s*[\n\r]+)+)?(?:\s*(?:%%\s*\{\s*\w+\s*:([^%]*?)%%\s*[\n\r]?))?(.*)$/s
        var m = d.exec( graph );
        var yaml = '';
        var dir = {};
        var content = graph;
        if( m && m.length == 4 ){
            yaml = m[YAML] ? m[YAML] : yaml;
            dir = m[INIT] ? JSON.parse( '{ "init": ' + m[INIT] ).init : dir;
            content = m[GRAPH] ? m[GRAPH] : content;
        }
        var ret = { yaml: yaml, dir: dir, content: content.trim() }
        return ret;
    };

    var serializeGraph = function( graph ){
        var s = graph.yaml + '%%{init: ' + JSON.stringify( graph.dir ) + '}%%\n' + graph.content;
        return s;
    };

    var init_func = function( attrs ){
        var is_initialized = false;
        var theme = attrs.theme;
        document.querySelectorAll('.mermaid').forEach( function( element ){
            var parse = parseGraph( decodeHTML( element.innerHTML ) );

            if( parse.dir.theme ){
                parse.dir.relearn_user_theme = true;
            }
            if( !parse.dir.relearn_user_theme ){
                parse.dir.theme = theme;
            }
            is_initialized = true;

            var graph = serializeGraph( parse );
            element.innerHTML = graph;
            var new_element = document.createElement( 'div' );
            new_element.classList.add( 'mermaid-container' );
            new_element.innerHTML = '<div class="mermaid-code">' + graph + '</div>' + element.outerHTML;
            element.parentNode.replaceChild( new_element, element );
        });
        return is_initialized;
    }

    var update_func = function( attrs ){
        var is_initialized = false;
        var theme = attrs.theme;
        document.querySelectorAll( '.mermaid-container' ).forEach( function( e ){
            var element = e.querySelector( '.mermaid' );
            var code = e.querySelector( '.mermaid-code' );
            var parse = parseGraph( decodeHTML( code.innerHTML ) );

            if( parse.dir.relearn_user_theme ){
                return;
            }
            if( parse.dir.theme == theme ){
                return;
            }
            is_initialized = true;

            parse.dir.theme = theme;
            var graph = serializeGraph( parse );
            element.removeAttribute('data-processed');
            element.innerHTML = graph;
            code.innerHTML = graph;
        });
        return is_initialized;
    };

    var state = this;
    if( update && !state.is_initialized ){
        return;
    }
    if( typeof variants == 'undefined' ){
        return;
    }
    if( typeof mermaid == 'undefined' || typeof mermaid.mermaidAPI == 'undefined' ){
        return;
    }

    if( !state.is_initialized ){
        state.is_initialized = true;
        window.addEventListener( 'beforeprint', function(){
            initMermaid( true, {
                'theme': variants.getColorValue( 'PRINT-MERMAID-theme' ),
            });
		}.bind( this ) );
		window.addEventListener( 'afterprint', function(){
            initMermaid( true );
		}.bind( this ) );
    }

    attrs = attrs || {
        'theme': variants.getColorValue( 'MERMAID-theme' ),
    };

    var search;
    if( update ){
        search = sessionStorage.getItem( baseUriFull+'search-value' );
        unmark();
    }
    var is_initialized = ( update ? update_func( attrs ) : init_func( attrs ) );
    if( is_initialized ){
        mermaid.init();
        // zoom for Mermaid
        // https://github.com/mermaid-js/mermaid/issues/1860#issuecomment-1345440607
        var svgs = d3.selectAll( '.mermaid.zoom svg' );
        svgs.each( function(){
            var svg = d3.select( this );
            svg.html( '<g>' + svg.html() + '</g>' );
            var inner = svg.select( 'g' );
            var zoom = d3.zoom().on( 'zoom', function( e ){
                inner.attr( 'transform', e.transform);
            });
            svg.call( zoom );
        });
    }
    if( update && search && search.length ){
        sessionStorage.setItem( baseUriFull+'search-value', search );
        mark();
    }
}

function initOpenapi( update, attrs ){
    if( isIE ){
        return;
    }

    var state = this;
    if( update && !state.is_initialized ){
        return;
    }
    if( typeof variants == 'undefined' ){
        return;
    }

    if( !state.is_initialized ){
        state.is_initialized = true;
        window.addEventListener( 'beforeprint', function(){
            initOpenapi( true, { isPrintPreview: true } );
        }.bind( this ) );
        window.addEventListener( 'afterprint', function(){
            initOpenapi( true, { isPrintPreview: false } );
        }.bind( this ) );
    }

    attrs = attrs || {
        isPrintPreview: false
    };

    function addFunctionToResizeEvent(){

    }
    function getFirstAncestorByClass(){

    }
    function renderOpenAPI(oc) {
        var buster = window.themeUseOpenapi.assetsBuster ? '?' + window.themeUseOpenapi.assetsBuster : '';
        var print = isPrint || attrs.isPrintPreview ? "PRINT-" : "";
		var theme = print ? `${baseUri}/css/theme-relearn-light.css` : document.querySelector( '#variant-style' ).attributes.href.value
        var swagger_theme = variants.getColorValue( print + 'OPENAPI-theme' );
        var swagger_code_theme = variants.getColorValue( print + 'OPENAPI-CODE-theme' );

        const openapiId = 'relearn-swagger-ui';
        const openapiIframeId = openapiId + "-iframe";
        const openapiIframe = document.getElementById(openapiIframeId);
        if (openapiIframe) {
            openapiIframe.remove();
        }
        const openapiErrorId = openapiId + '-error';
        const openapiError = document.getElementById(openapiErrorId);
        if (openapiError) {
            openapiError.remove();
        }
        const oi = document.createElement('iframe');
        oi.id = openapiIframeId;
        oi.classList.toggle('sc-openapi-iframe', true);
        oi.srcdoc =
            '<!doctype html>' +
            '<html lang="en">' +
                '<head>' +
                    '<link rel="stylesheet" href="' + window.themeUseOpenapi.css + '">' +
                    '<link rel="stylesheet" href="' + theme + '">' +
                    '<link rel="stylesheet" href="' + baseUri + '/css/swagger.css' + buster + '">' +
                    '<link rel="stylesheet" href="' + baseUri + '/css/swagger-' + swagger_theme + '.css' + buster + '">' +
                '</head>' +
                '<body>' +
                    '<a class="relearn-expander" href="" onclick="return relearn_collapse_all()">Collapse all</a>' +
                    '<a class="relearn-expander" href="" onclick="return relearn_expand_all()">Exapnd all</a>' +
                    '<div id="relearn-swagger-ui"></div>' +
                    '<script>' +
                        'function relearn_expand_all(){' +
                            'document.querySelectorAll( ".opblock-summary-control[aria-expanded=false]" ).forEach( btn => btn.click() );' +
                            'document.querySelectorAll( ".model-container > .model-box > button[aria-expanded=false]" ).forEach( btn => btn.click() );' +
                            'return false;' +
                        '}' +
                        'function relearn_collapse_all(){' +
                            'document.querySelectorAll( ".opblock-summary-control[aria-expanded=true]" ).forEach( btn => btn.click() );' +
                            'document.querySelectorAll( ".model-container > .model-box > .model-box > .model > span > button[aria-expanded=true]" ).forEach( btn => btn.click() );' +
                            'return false;' +
                        '}' +
                    '</script>' +
                '</body>' +
            '</html>';
        oi.height = '100%';
        oi.width = '100%';
        oi.onload = function(){
            const openapiWrapper = getFirstAncestorByClass(oc, 'sc-openapi-wrapper');
            const openapiPromise = new Promise( function(resolve){ resolve() });
            openapiPromise
                .then( function(){
                    SwaggerUIBundle({
                        defaultModelsExpandDepth: 2,
                        defaultModelExpandDepth: 2,
                        docExpansion: isPrint || attrs.isPrintPreview ? 'full' : 'list',
                        domNode: oi.contentWindow.document.getElementById(openapiId),
                        filter: !( isPrint || attrs.isPrintPreview ),
                        layout: 'BaseLayout',
                        onComplete: function(){
                            if( isPrint || attrs.isPrintPreview ){
                                oi.contentWindow.document.querySelectorAll( '.model-container > .model-box > button[aria-expanded=false]' ).forEach( function(btn){ btn.click() });
                                setOpenAPIHeight(oi);
                            }
                        },
                        plugins: [
                            SwaggerUIBundle.plugins.DownloadUrl
                        ],
                        presets: [
                            SwaggerUIBundle.presets.apis,
                            SwaggerUIStandalonePreset,
                        ],
                        syntaxHighlight: {
                            activated: true,
                            theme: swagger_code_theme,
                        },
                        url: oc.getAttribute('openapi-url'),
                        validatorUrl: 'none',
                    });
                })
                .then( function(){
                    let observerCallback = function () {
                        setOpenAPIHeight(oi);
                    };
                    let observer = new MutationObserver(observerCallback);
                    observer.observe(oi.contentWindow.document.documentElement, {
                        childList: true,
                        subtree: true,
                    });
                })
                .then( function(){
                    if (openapiWrapper) {
                        openapiWrapper.classList.toggle('is-loading', false);
                    }
                    setOpenAPIHeight(oi);
                })
                .catch( function(error){
                    const ed = document.createElement('div');
                    ed.classList.add('sc-alert', 'sc-alert-error');
                    ed.innerHTML = error;
                    ed.id = openapiErrorId;
                    while (oc.lastChild) {
                        oc.removeChild(oc.lastChild);
                    }
                    if (openapiWrapper) {
                        openapiWrapper.classList.toggle('is-loading', false);
                        openapiWrapper.insertAdjacentElement('afterbegin', ed);
                    }
                });
        };
        oc.appendChild(oi);
    }
    function setOpenAPIHeight(oi) {
        // add empirical offset if in print preview (GC 103)
        oi.style.height =
            (oi.contentWindow.document.documentElement.getBoundingClientRect().height + (attrs.isPrintPreview ? 200 : 0) )+
            'px';
    }
    function resizeOpenAPI() {
        let divi = document.getElementsByClassName('sc-openapi-iframe');
        for (let i = 0; i < divi.length; i++) {
            setOpenAPIHeight(divi[i]);
        }
    };
    let divo = document.getElementsByClassName('sc-openapi-container');
    for (let i = 0; i < divo.length; i++) {
        renderOpenAPI(divo[i]);
    }
    if (divo.length) {
        addFunctionToResizeEvent(resizeOpenAPI);
    }
}

function initAnchorClipboard(){
    document.querySelectorAll( 'h1~h2,h1~h3,h1~h4,h1~h5,h1~h6').forEach( function( element ){
        var url = encodeURI( (document.location.origin == "null" ? (document.location.protocol + "//" + document.location.host) : document.location.origin )+ document.location.pathname);
        var link = url + "#" + element.id;
        var new_element = document.createElement( 'span' );
        new_element.classList.add( 'anchor' );
        new_element.setAttribute( 'title', window.T_Copy_link_to_clipboard );
        new_element.setAttribute( 'data-clipboard-text', link );
        new_element.innerHTML = '<i class="fas fa-link fa-lg"></i>';
        element.appendChild( new_element );
    });

    var anchors = document.querySelectorAll( '.anchor' );
    for( var i = 0; i < anchors.length; i++ ) {
      anchors[i].addEventListener( 'mouseleave', function( e ){
        this.removeAttribute( 'aria-label' );
        this.classList.remove( 'tooltipped', 'tooltipped-se', 'tooltipped-sw' );
      });
    }

    var clip = new ClipboardJS( '.anchor' );
    clip.on( 'success', function( e ){
        e.clearSelection();
        e.trigger.setAttribute( 'aria-label', window.T_Link_copied_to_clipboard );
        e.trigger.classList.add( 'tooltipped', 'tooltipped-s'+(isRtl?'e':'w') );
    });
}

function initCodeClipboard(){
    function fallbackMessage( action ){
        var actionMsg = '';
        var actionKey = (action === 'cut' ? 'X' : 'C');
        if (/iPhone|iPad/i.test(navigator.userAgent)) {
            actionMsg = 'No support :(';
        }
        else if (/Mac/i.test(navigator.userAgent)) {
            actionMsg = 'Press ⌘-' + actionKey + ' to ' + action;
        }
        else {
            actionMsg = 'Press Ctrl-' + actionKey + ' to ' + action;
        }
        return actionMsg;
    }

	var codeElements = document.querySelectorAll( 'code' );
	for( var i = 0; i < codeElements.length; i++ ){
        var code = codeElements[i];
        var text = code.textContent;
        var inPre = code.parentNode.tagName.toLowerCase() == 'pre';

        if( inPre || text.length > 5 ){
            var clip = new ClipboardJS( '.copy-to-clipboard-button', {
                text: function( trigger ){
                    var text = trigger.previousElementSibling && trigger.previousElementSibling.matches( 'code' ) && trigger.previousElementSibling.textContent;
                    // remove a trailing line break, this may most likely
                    // come from the browser / Hugo transformation
                    text = text.replace( /\n$/, '' );
                    // removes leading $ signs from text in an assumption
                    // that this has to be the unix prompt marker - weird
                    return text.replace( /^\$\s/gm, '' );
                }
            });

            clip.on( 'success', function( e ){
                e.clearSelection();
                var inPre = e.trigger.parentNode.tagName.toLowerCase() == 'pre';
                e.trigger.setAttribute( 'aria-label', window.T_Copied_to_clipboard );
                e.trigger.classList.add( 'tooltipped', 'tooltipped-' + (inPre ? 'w' : 's'+(isRtl?'e':'w')) );
            });

            clip.on( 'error', function( e ){
                var inPre = e.trigger.parentNode.tagName.toLowerCase() == 'pre';
                e.trigger.setAttribute( 'aria-label', fallbackMessage(e.action) );
                e.trigger.classList.add( 'tooltipped', 'tooltipped-' + (inPre ? 'w' : 's'+(isRtl?'e':'w')) );
                var f = function(){
                    e.trigger.setAttribute( 'aria-label', window.T_Copied_to_clipboard );
                    e.trigger.classList.add( 'tooltipped', 'tooltipped-' + (inPre ? 'w' : 's'+(isRtl?'e':'w')) );
                    document.removeEventListener( 'copy', f );
                };
                document.addEventListener( 'copy', f );
            });

            code.classList.add( 'copy-to-clipboard-code' );
            if( inPre ){
                code.classList.add( 'copy-to-clipboard' );
                code.parentNode.classList.add( 'pre-code' );
            }
            else{
                var clone = code.cloneNode( true );
                var span = document.createElement( 'span' );
                span.classList.add( 'copy-to-clipboard' );
                span.appendChild( clone );
                code.parentNode.replaceChild( span, code );
                code = clone;
            }
            var button = document.createElement( 'span' );
            button.classList.add( 'copy-to-clipboard-button' );
            button.setAttribute( 'title', window.T_Copy_to_clipboard );
            button.innerHTML = '<i class="fas fa-copy"></i>';
            button.addEventListener( 'mouseleave', function() {
                this.removeAttribute( 'aria-label' );
                this.classList.remove( 'tooltipped', 'tooltipped-w', 'tooltipped-se', 'tooltipped-sw' );
            });
            code.parentNode.insertBefore( button, code.nextSibling );
        }
    }
}

function initArrowNav(){
    if( isPrint ){
        return;
    }

    // button navigation
    var prev = document.querySelector( 'a.nav-prev' );
    prev && prev.addEventListener( 'click', navPrev );
    var next = document.querySelector( 'a.nav-next' );
    next && next.addEventListener( 'click', navNext );

    // keyboard navigation
    // avoid prev/next navigation if we are not at the start/end of the
    // horizontal area
    var el = document.querySelector('#body-inner');
    var scrollStart = 0;
    var scrollEnd = 0;
    document.addEventListener('keydown', function(event){
        if( !event.shiftKey && !event.ctrlKey && !event.altKey && !event.metaKey ){
            if( event.which == dir_key_start ){
                if( !scrollStart && +el.scrollLeft.toFixed()*dir_scroll <= 0 ){
                    prev && prev.click();
                }
                else if( scrollStart != -1 ){
                    clearTimeout( scrollStart );
                }
                scrollStart = -1;
            }
            if( event.which == dir_key_end ){
                if( !scrollEnd && +el.scrollLeft.toFixed()*dir_scroll + +el.clientWidth.toFixed() >= +el.scrollWidth.toFixed() ){
                    next && next.click();
                }
                else if( scrollEnd != -1 ){
                    clearTimeout( scrollEnd );
                }
                scrollEnd = -1;
            }
        }
    });
    document.addEventListener('keyup', function(event){
        if( !event.shiftKey && !event.ctrlKey && !event.altKey && !event.metaKey ){
            if( event.which == dir_key_start ){
                // check for false indication if keyup is delayed after navigation
                if( scrollStart == -1 ){
                    scrollStart = setTimeout( function(){ scrollStart = 0; }, 300 );
                }
            }
            if( event.which == dir_key_end ){
                if( scrollEnd == -1 ){
                    scrollEnd = setTimeout( function(){ scrollEnd = 0; }, 300 );
                }
            }
        }
    });

    // avoid keyboard navigation for input fields
    document.querySelectorAll( formelements ).forEach( function( e ){
        e.addEventListener( 'keydown', function( event ){
            if( event.which == dir_key_start || event.which == dir_key_end ){
                event.stopPropagation();
            }
        });
    });
}

function initMenuScrollbar(){
    if( isPrint ){
        return;
    }

    var elm = document.querySelector('#content-wrapper');
    var elt = document.querySelector('#TableOfContents');

    var autofocus = true;
    document.addEventListener('keydown', function(event){
        // for initial keyboard scrolling support, no element
        // may be hovered, but we still want to react on
        // cursor/page up/down. because we can't hack
        // the scrollbars implementation, we try to trick
        // it and give focus to the scrollbar - only
        // to just remove the focus right after scrolling
        // happend
        autofocus = false;
        if( event.shiftKey || event.altKey || event.ctrlKey || event.metaKey || event.which < 32 || event.which > 40 ){
            // if tab key was pressed, we are ended with our initial
            // focus job
            return;
        }

        var c = elc && elc.matches(':hover');
        var m = elm && elm.matches(':hover');
        var t = elt && elt.matches(':hover');
        var f = event.target.matches( formelements );
        if( !c && !m && !t && !f ){
            // only do this hack if none of our scrollbars
            // is hovered
            // if we are showing the sidebar as a flyout we
            // want to scroll the content-wrapper, otherwise we want
            // to scroll the body
            var nt = document.querySelector('body').matches('.toc-flyout');
            var nm = document.querySelector('body').matches('.sidebar-flyout');
            if( nt ){
                pst && pst.scrollbarY.focus();
            }
            else if( nm ){
                psm && psm.scrollbarY.focus();
            }
            else{
                document.querySelector('#body-inner').focus();
                psc && psc.scrollbarY.focus();
            }
        }
    });
    // scrollbars will install their own keyboard handlers
    // that need to be executed inbetween our own handlers
    // PSC removed for #242 #243 #244
    // psc = elc && new PerfectScrollbar('#body-inner');
    psm = elm && new PerfectScrollbar('#content-wrapper');
    pst = elt && new PerfectScrollbar('#TableOfContents');
    document.addEventListener('keydown', function(){
        // if we facked initial scrolling, we want to
        // remove the focus to not leave visual markers on
        // the scrollbar
        if( autofocus ){
            psc && psc.scrollbarY.blur();
            psm && psm.scrollbarY.blur();
            pst && pst.scrollbarY.blur();
            autofocus = false;
        }
    });
    // on resize, we have to redraw the scrollbars to let new height
    // affect their size
    window.addEventListener('resize', function(){
        pst && setTimeout( function(){ pst.update(); }, 10 );
        psm && setTimeout( function(){ psm.update(); }, 10 );
        psc && setTimeout( function(){ psc.update(); }, 10 );
    });
    // now that we may have collapsible menus, we need to call a resize
    // for the menu scrollbar if sections are expanded/collapsed
    document.querySelectorAll('#sidebar .collapsible-menu input').forEach( function(e){
        e.addEventListener('change', function(){
            psm && setTimeout( function(){ psm.update(); }, 10 );
        });
    });
    // bugfix for PS in RTL mode: the initial scrollbar position is off;
    // calling update() once, fixes this
    pst && setTimeout( function(){ pst.update(); }, 10 );
    psm && setTimeout( function(){ psm.update(); }, 10 );
    psc && setTimeout( function(){ psc.update(); }, 10 );

    // finally, we want to adjust the contents end padding if there is a scrollbar visible
    window.addEventListener('resize', adjustContentWidth );
    adjustContentWidth();
}

function imageEscapeHandler( event ){
    if( event.key == "Escape" ){
        var image = event.target;
        image.click();
    }
}

function sidebarEscapeHandler( event ){
    if( event.key == "Escape" ){
        var b = document.querySelector( 'body' );
        b.classList.remove( 'sidebar-flyout' );
        document.removeEventListener( 'keydown', sidebarEscapeHandler );
        documentFocus();
    }
}

function tocEscapeHandler( event ){
    if( event.key == "Escape" ){
        var b = document.querySelector( 'body' );
        b.classList.remove( 'toc-flyout' );
        document.removeEventListener( 'keydown', tocEscapeHandler );
        documentFocus();
    }
}

function sidebarShortcutHandler( event ){
    if( !event.shiftKey && event.altKey && event.ctrlKey && !event.metaKey && event.which == 78 /* n */ ){
        showNav();
    }
}

function searchShortcutHandler( event ){
    if( !event.shiftKey && event.altKey && event.ctrlKey && !event.metaKey && event.which == 70 /* f */ ){
        showSearch();
    }
}

function tocShortcutHandler( event ){
    if( !event.shiftKey && event.altKey && event.ctrlKey && !event.metaKey && event.which == 84 /* t */ ){
        showToc();
    }
}

function editShortcutHandler( event ){
    if( !event.shiftKey && event.altKey && event.ctrlKey && !event.metaKey && event.which == 87 /* w */ ){
        showEdit();
    }
}

function printShortcutHandler( event ){
    if( !event.shiftKey && event.altKey && event.ctrlKey && !event.metaKey && event.which == 80 /* p */ ){
        showPrint();
    }
}

function showSearch(){
    var s = document.querySelector( '#search-by' );
    if( !s ){
        return;
    }
    var b = document.querySelector( 'body' );
    if( s == document.activeElement ){
        if( b.classList.contains( 'sidebar-flyout' ) ){
            showNav();
        }
        documentFocus();
    } else {
        if( !b.classList.contains( 'sidebar-flyout' ) ){
            showNav();
        }
        s.focus();
    }
}

function showNav(){
    if( !document.querySelector( '#sidebar-overlay' ) ){
        // we may not have a flyout
        return;
    }
    var b = document.querySelector( 'body' );
    b.classList.toggle( 'sidebar-flyout' );
    if( b.classList.contains( 'sidebar-flyout' ) ){
        b.classList.remove( 'toc-flyout' );
        document.removeEventListener( 'keydown', tocEscapeHandler );
        document.addEventListener( 'keydown', sidebarEscapeHandler );
    }
    else{
        document.removeEventListener( 'keydown', sidebarEscapeHandler );
        documentFocus();
    }
}

function showToc(){
    var t = document.querySelector( '#toc-menu' );
    if( !t ){
        // we may not have a toc
        return;
    }
    var b = document.querySelector( 'body' );
    b.classList.toggle( 'toc-flyout' );
    if( b.classList.contains( 'toc-flyout' ) ){
        pst && setTimeout( function(){ pst.update(); }, 10 );
        pst && pst.scrollbarY.focus();
        document.querySelector( '.toc-wrapper ul a' ).focus();
        document.addEventListener( 'keydown', tocEscapeHandler );
    }
    else{
        document.removeEventListener( 'keydown', tocEscapeHandler );
        documentFocus();
    }
}

function showEdit(){
    var l = document.querySelector( '#top-github-link a' );
    if( l ){
        l.click();
    }
}

function showPrint(){
    var l = document.querySelector( '#top-print-link a' );
    if( l ){
        l.click();
    }
}

function navPrev(){
    var e = document.querySelector( 'a.nav-prev' );
    location.href = e && e.getAttribute( 'href' );
};

function navNext(){
    var e = document.querySelector( 'a.nav-next' );
    location.href = e && e.getAttribute( 'href' );
};

function initToc(){
    if( isPrint ){
        return;
    }

    document.addEventListener( 'keydown', editShortcutHandler );
    document.addEventListener( 'keydown', printShortcutHandler );
    document.addEventListener( 'keydown', sidebarShortcutHandler );
    document.addEventListener( 'keydown', searchShortcutHandler );
    document.addEventListener( 'keydown', tocShortcutHandler );

    document.querySelector( '#sidebar-overlay' ).addEventListener( 'click', showNav );
    document.querySelector( '#sidebar-toggle' ).addEventListener( 'click', showNav );
    document.querySelector( '#toc-overlay' ).addEventListener( 'click', showToc );
    var t = document.querySelector( '#toc-menu' );
    var p = document.querySelector( '.progress' );
    if( t && p ){
        // we may not have a toc
        t.addEventListener( 'click', showToc );
        p.addEventListener( 'click', showToc );
    }

    // finally give initial focus to allow keyboard scrolling in FF
    documentFocus();
}

function initSwipeHandler(){
    if( !touchsupport ){
        return;
    }

    var startx = null;
    var starty = null;
    var handleStartX = function(evt) {
        startx = evt.touches[0].clientX;
        starty = evt.touches[0].clientY;
        return false;
    };
    var handleMoveX = function(evt) {
        if( startx !== null ){
            var diffx = startx - evt.touches[0].clientX;
            var diffy = starty - evt.touches[0].clientY || .1 ;
            if( diffx / Math.abs( diffy ) < 2 ){
                // detect mostly vertical swipes and reset our starting pos
                // to not detect a horizontal move if vertical swipe is unprecise
                startx = evt.touches[0].clientX;
            }
            else if( diffx > 30 ){
                startx = null;
                starty = null;
                var b = document.querySelector( 'body' );
                b.classList.remove( 'sidebar-flyout' );
                document.removeEventListener( 'keydown', sidebarEscapeHandler );
                documentFocus();
            }
        }
        return false;
    };
    var handleEndX = function(evt) {
        startx = null;
        starty = null;
        return false;
    };

    document.querySelector( '#sidebar-overlay' ).addEventListener("touchstart", handleStartX, false);
    document.querySelector( '#sidebar' ).addEventListener("touchstart", handleStartX, false);
    document.querySelectorAll( '#sidebar *' ).forEach( function(e){ e.addEventListener("touchstart", handleStartX); }, false);
    document.querySelector( '#sidebar-overlay' ).addEventListener("touchmove", handleMoveX, false);
    document.querySelector( '#sidebar' ).addEventListener("touchmove", handleMoveX, false);
    document.querySelectorAll( '#sidebar *' ).forEach( function(e){ e.addEventListener("touchmove", handleMoveX); }, false);
    document.querySelector( '#sidebar-overlay' ).addEventListener("touchend", handleEndX, false);
    document.querySelector( '#sidebar' ).addEventListener("touchend", handleEndX, false);
    document.querySelectorAll( '#sidebar *' ).forEach( function(e){ e.addEventListener("touchend", handleEndX); }, false);
}

function initImage(){
    document.querySelectorAll( '.lightbox' ).forEach( function(e){ e.addEventListener("keydown", imageEscapeHandler); }, false);
}

function clearHistory() {
    var visitedItem = baseUriFull + 'visited-url/'
    for( var item in sessionStorage ){
        if( item.substring( 0, visitedItem.length ) === visitedItem ){
            sessionStorage.removeItem( item );
            var url = item.substring( visitedItem.length );
            // in case we have `relativeURLs=true` we have to strip the
            // relative path to root
            url = url.replace( /\.\.\//g, '/' ).replace( /^\/+\//, '/' );
            document.querySelectorAll( '[data-nav-id="'+url+'"]' ).forEach( function( e ){
                e.classList.remove( 'visited' );
            });
        }
    }
}

function initHistory() {
    var visitedItem = baseUriFull + 'visited-url/'
    sessionStorage.setItem( visitedItem+document.querySelector( 'body' ).dataset.url, 1);

    // loop through the sessionStorage and see if something should be marked as visited
    for( var item in sessionStorage ){
        if( item.substring( 0, visitedItem.length ) === visitedItem && sessionStorage.getItem( item ) == 1 ){
            var url = item.substring( visitedItem.length );
            // in case we have `relativeURLs=true` we have to strip the
            // relative path to root
            url = url.replace( /\.\.\//g, '/' ).replace( /^\/+\//, '/' );
            document.querySelectorAll( '[data-nav-id="'+url+'"]' ).forEach( function( e ){
                e.classList.add( 'visited' );
            });
        }
    }
}

function initScrollPositionSaver(){
    function savePosition( event ){
        var state = window.history.state || {};
        state = Object.assign( {}, ( typeof state === 'object' ) ? state : {} );
        state.contentScrollTop = +elc.scrollTop;
        window.history.replaceState( state, '', window.location );
    };
    window.addEventListener( 'pagehide', savePosition );
}

function scrollToPositions() {
    // show active menu entry
    window.setTimeout( function(){
        var e = document.querySelector( '#sidebar li.active a' );
        if( e && e.scrollIntoView ){
            e.scrollIntoView({
                block: 'center',
            });
        }
    }, 10 );

    // scroll the content to point of interest;
    // if we have a scroll position saved, the user was here
    // before in his history stack and we want to reposition
    // to the position he was when he left the page;
    // otherwise if he used page search before, we want to position
    // to its last outcome;
    // otherwise he may want to see a specific fragment

    var state = window.history.state || {};
    state = ( typeof state === 'object')  ? state : {};
    if( state.hasOwnProperty( 'contentScrollTop' ) ){
        window.setTimeout( function(){
            elc.scrollTop = +state.contentScrollTop;
        }, 10 );
        return;
    }

    var search = sessionStorage.getItem( baseUriFull+'search-value' );
    if( search && search.length ){
        var found = elementContains( search, elc );
        var searchedElem = found.length && found[ 0 ];
        if( searchedElem ){
            searchedElem.scrollIntoView( true );
            var scrolledY = window.scrollY;
            if( scrolledY ){
                window.scroll( 0, scrolledY - 125 );
            }
        }
        return;
    }

    if( window.location.hash && window.location.hash.length > 1 ){
        window.setTimeout( function(){
            try{
                var e = document.querySelector( window.location.hash );
                if( e && e.scrollIntoView ){
                    e.scrollIntoView({
                        block: 'start',
                    });
                }
            } catch( e ){}
        }, 10 );
        return;
    }
}

function mark() {
	// mark some additional stuff as searchable
	var topbarLinks = document.querySelectorAll( '#topbar a:not(.topbar-link):not(.btn)' );
	for( var i = 0; i < topbarLinks.length; i++ ){
		topbarLinks[i].classList.add( 'highlight' );
	}

	var bodyInnerLinks = document.querySelectorAll( '#body-inner a:not(.lightbox-link):not(.btn):not(.lightbox)' );
	for( var i = 0; i < bodyInnerLinks.length; i++ ){
		bodyInnerLinks[i].classList.add( 'highlight' );
	}

	var value = sessionStorage.getItem( baseUriFull + 'search-value' );
    var highlightableElements = document.querySelectorAll( '.highlightable' );
    highlight( highlightableElements, value, { element: 'mark' } );

	var markedElements = document.querySelectorAll( 'mark' );
	for( var i = 0; i < markedElements.length; i++ ){
		var parent = markedElements[i].parentNode;
		while( parent && parent.classList ){
			if( parent.classList.contains( 'expand' ) ){
				var expandInputs = parent.querySelectorAll( 'input:not(.expand-marked)' );
				if( expandInputs.length ){
					expandInputs[0].classList.add( 'expand-marked' );
					expandInputs[0].dataset.checked = expandInputs[0].checked ? 'true' : 'false';
					expandInputs[0].checked = true;
				}
			}
			if( parent.tagName.toLowerCase() === 'li' && parent.parentNode && parent.parentNode.tagName.toLowerCase() === 'ul' && parent.parentNode.classList.contains( 'collapsible-menu' )){
				var toggleInputs = parent.querySelectorAll( 'input:not(.menu-marked)' );
				if( toggleInputs.length ){
					toggleInputs[0].classList.add( 'menu-marked' );
					toggleInputs[0].dataset.checked = toggleInputs[0].checked ? 'true' : 'false';
					toggleInputs[0].checked = true;
				}
			}
			parent = parent.parentNode;
		}
	}
    psm && setTimeout( function(){ psm.update(); }, 10 );
}
window.relearn.markSearch = mark;

function highlight( es, words, options ){
    var settings = {
        className: 'highlight',
        element: 'span',
        caseSensitive: false,
        wordsOnly: false
    };
    Object.assign( settings, options );

    if( !words ){ return; }
    if( words.constructor === String ){
        words = [ words ];
    }
    words = words.filter( function( word, i ){
        return word != '';
    });
    words = words.map( function( word, i ){
        return word.replace(/[-[\]{}()*+?.,\\^$|#\s]/g, "\\$&");
    });
    if( words.length == 0 ){ return this; }

    var flag = settings.caseSensitive ? '' : 'i';
    var pattern = "(" + words.join( '|' ) + ')';
    if( settings.wordsOnly ){
        pattern = '\\b' + pattern + '\\b';
    }
    var re = new RegExp( pattern, flag );

	for( var i = 0; i < es.length; i++ ){
        highlightNode( es[i], re, settings.element, settings.className );
	}
};

function highlightNode( node, re, nodeName, className ){
    if( node.nodeType === 3 && node.parentElement && node.parentElement.namespaceURI == 'http://www.w3.org/1999/xhtml' ) { // text nodes
        var match = node.data.match( re );
        if( match ){
            var highlight = document.createElement( nodeName || 'span' );
            highlight.className = className || 'highlight';
            var wordNode = node.splitText( match.index );
            wordNode.splitText( match[0].length );
            var wordClone = wordNode.cloneNode( true );
            highlight.appendChild( wordClone );
            wordNode.parentNode.replaceChild( highlight, wordNode );
            return 1; //skip added node in parent
        }
    } else if( (node.nodeType === 1 && node.childNodes) && // only element nodes that have children
        !/(script|style)/i.test(node.tagName) && // ignore script and style nodes
        !(node.tagName === nodeName.toUpperCase() && node.className === className) ){ // skip if already highlighted
        for( var i = 0; i < node.childNodes.length; i++ ){
            i += highlightNode( node.childNodes[i], re, nodeName, className );
        }
    }
    return 0;
};

function unmark() {
	sessionStorage.removeItem( baseUriFull + 'search-value' );
	var markedElements = document.querySelectorAll( 'mark' );
	for( var i = 0; i < markedElements.length; i++ ){
		var parent = markedElements[i].parentNode;
		while( parent && parent.classList ){
			if( parent.tagName.toLowerCase() === 'li' && parent.parentNode && parent.parentNode.tagName.toLowerCase() === 'ul' && parent.parentNode.classList.contains( 'collapsible-menu' )){
				var toggleInputs = parent.querySelectorAll( 'input.menu-marked' );
				if( toggleInputs.length ){
					toggleInputs[0].checked = toggleInputs[0].dataset.checked === 'true';
					toggleInputs[0].dataset.checked = null;
					toggleInputs[0].classList.remove( 'menu-marked' );
				}
			}
			if( parent.classList.contains( 'expand' ) ){
				var expandInputs = parent.querySelectorAll( 'input.expand-marked' );
				if( expandInputs.length ){
					expandInputs[0].checked = expandInputs[0].dataset.checked === 'true';
					expandInputs[0].dataset.checked = null;
					expandInputs[0].classList.remove( 'expand-marked' );
				}
			}
			parent = parent.parentNode;
		}
	}

	var highlighted = document.querySelectorAll( '.highlightable' );
    unhighlight( highlighted, { element: 'mark' } );
    psm && setTimeout( function(){ psm.update(); }, 10 );
}

function unhighlight( es, options ){
    var settings = {
        className: 'highlight',
        element: 'span'
    };
    Object.assign( settings, options );

	for( var i = 0; i < es.length; i++ ){
        var highlightedElements = es[i].querySelectorAll( settings.element + '.' + settings.className );
        for( var j = 0; j < highlightedElements.length; j++ ){
            var parent = highlightedElements[j].parentNode;
            parent.replaceChild( highlightedElements[j].firstChild, highlightedElements[j] );
            parent.normalize();
        }
	}
};

// replace jQuery.createPseudo with https://stackoverflow.com/a/66318392
function elementContains( txt, e ){
    var regex = RegExp( txt, 'i' );
    var nodes = [];
    if( e ){
        var tree = document.createTreeWalker( e, 4 /* NodeFilter.SHOW_TEXT */, function( node ){
            return regex.test( node.data );
        }, false );
        var node = null;
        while( node = tree.nextNode() ){
            nodes.push( node.parentElement );
        }
    }
    return nodes;
}

function searchInputHandler( value ){
    unmark();
    if( value.length ){
        sessionStorage.setItem( baseUriFull+'search-value', value );
        mark();
    }
}

function initSearch() {
    // sync input/escape between searchbox and searchdetail
    var inputs = document.querySelectorAll( 'input.search-by' );
    inputs.forEach( function( e ){
        e.addEventListener( 'keydown', function( event ){
            if( event.key == 'Escape' ){
                var input = event.target;
                var search = sessionStorage.getItem( baseUriFull+'search-value' );
                if( !search || !search.length ){
                    input.blur();
                }
                searchInputHandler( '' );
                inputs.forEach( function( e ){
                    e.value = '';
                });
                if( !search || !search.length ){
                    documentFocus();
                }
            }
        });
        e.addEventListener( 'input', function( event ){
            var input = event.target;
            var value = input.value;
            searchInputHandler( value );
            inputs.forEach( function( e ){
                if( e != input ){
                    e.value = value;
                }
            });
        });
    });

    document.querySelectorAll( '[data-search-clear]' ).forEach( function( e ){
        e.addEventListener( 'click', function(){
            inputs.forEach( function( e ){
                e.value = '';
                var event = document.createEvent( 'Event' );
                event.initEvent( 'input', false, false );
                e.dispatchEvent( event );
            });
            unmark();
        });
    });

    var urlParams = new URLSearchParams( window.location.search );
    var value = urlParams.get( 'search-by' );
    if( value ){
        sessionStorage.setItem( baseUriFull+'search-value', value );
    }
    mark();

    // set initial search value for inputs on page load
    if( sessionStorage.getItem( baseUriFull+'search-value' ) ){
        var search = sessionStorage.getItem( baseUriFull+'search-value' );
        inputs.forEach( function( e ){
            e.value = search;
            var event = document.createEvent( 'Event' );
            event.initEvent( 'input', false, false );
            e.dispatchEvent( event );
        });
    }

    window.relearn.isSearchInit = true;
    window.relearn.runInitialSearch && window.relearn.runInitialSearch();
}

ready( function(){
    initArrowNav();
    initMermaid();
    initOpenapi();
    initMenuScrollbar();
    initToc();
    initAnchorClipboard();
    initCodeClipboard();
    fixCodeTabs();
    restoreTabSelections();
    initSwipeHandler();
    initHistory();
    initSearch();
    initImage();
    initScrollPositionSaver();
    scrollToPositions();
});

function useMermaid( config ){
    if( !Object.assign ){
        // We don't support Mermaid for IE11 anyways, so bail out early
        return;
    }
    if (typeof mermaid != 'undefined' && typeof mermaid.mermaidAPI != 'undefined') {
        mermaid.initialize( Object.assign( { "securityLevel": "antiscript", "startOnLoad": false     }, config ) );
        if( config.theme && variants ){
            var write_style = variants.findLoadedStylesheet( 'variant-style' );
            write_style.setProperty( '--CONFIG-MERMAID-theme', config.theme );
        }
    }
}
if( window.themeUseMermaid ){
    useMermaid( window.themeUseMermaid );
}

function useOpenapi( config ){
    if( config.css && config.css.startsWith( '/' ) ){
        config.css = baseUri + config.css;
    }
}
if( window.themeUseOpenapi ){
    useOpenapi( window.themeUseOpenapi );
}