ax-adoc-chrome.js

// @format
/*
 * Enhances he asciidoctor browser extension for:
 * - side toc, incl bootstrap styles
 * - theme selectors for adoc and code highlighting, persistent over sessions
 *
 * Save this on your host and tell the chrome extension to use it as prerendering script.
 * Disable any style in the extension!
 *
 * skins from https://github.com/darshandsoni/asciidoctor-skins
 *
 *
 */
// TODO: Encapsulate as module, we spam the namespace. But this is (not yet) a real js app
//
// ----------------------------------------------------------------------------- Config

// CAUTION: server cors necessary!
// for self hosting, e.g. nginx:  add_header Access-Control-Allow-Origin '*';
// Server serves: /stylesheets/.. and /highlightjs/... under the base url
var SERVER_URL =
    'https://raw.githubusercontent.com/axiros/adoctools/master/server/asciidoctor'

var TOC_LEFT = 'always' // ['always', ':toc:' ':toc: left', 'never']
var THEMES = 'always' // ['always', ':themes:', 'never']

// --------------------------------------------------------------------------- Internal
var D = document

//var S = localStorage
var byid = function(id) {
    return D.getElementById(id)
}
var dflt_theme = {adoc: 'asciidoctor', code: 'github'}

function docbody() {
    return D.getElementsByTagName('body')[0]
}
function is_set(s, getval = false) {
    // get attribute set bool or its value
    let i = docbody().innerText.split(s)
    if (i.length == 1) return false
    if (!getval) return true
    return i[1].split('\n')[0].replace(' ', '')
}
function S() {
    // we can't ref local storage global, crashes all when sandboxed:
    return localStorage
}
function get_cur_theme(typ) {
    let cur_theme = S().getItem('cur_theme' + typ)
    return cur_theme ? cur_theme : dflt_theme[typ]
}
function remember_cur_theme(t, typ) {
    S().setItem('cur_theme' + typ, t)
}

function allthemes() {
    return D.TH.index
}

function repl(s, l) {
    for (let i = 0; i < l.length; i++) s = s.replace(l[i][0], l[i][1])
    return s
}

function make_theme_switchers() {
    // theme switchers
    // wait until loaded, comes from server
    // if (!allthemes()['adoc']) {
    //     // don't know how to find when the extension is done rendering :-/
    //     return setTimeout(make_theme_switchers, 100)
    // }
    let switchers = D.createElement('table')
    switchers.id = 'switchers'
    docbody().appendChild(switchers)
    let tr, f, o, skin_name, ak, skins, cur_theme, switcher, dropdown, typ, m, d
    types = ['adoc', 'code']
    for (let j = 0; j < 2; j++) {
        typ = types[j]
        cur_theme = get_cur_theme(typ)
        switcher = D.createElement('td')
        tr = D.createElement('tr')
        switchers.appendChild(tr)
        tr.appendChild(switcher)
        switcher.id = typ + '_switcher'
        ak = {adoc: 's', code: 'c'}[typ]
        d =
            '\n<select title="ddtitle" name="switcher_dropdown" id="ddid" accesskey="ddaccesskey"'
        d += ' onchange="set_theme(this.value, \'ddtyp\')">\n'
        m = D.TH[typ]
        d = repl(d, [
            ['ddaccesskey', m.ddaccesskey],
            ['ddtitle', m.ddtitle],
            ['ddid', m.ddid],
            ['ddtyp', typ],
        ])
        skins = allthemes()[typ]
        if (!skins) debugger
        for (let i = 0; i < skins.length; i++) {
            f = skins[i]
            sel = cur_theme == f ? ' selected ' : ''
            o = '\n<option value="_f_" _sel_>_f2_</option>\n'
            d += repl(o, [
                ['_f_', f],
                ['_f2_', f],
                ['_sel_', sel],
            ])
        }
        d += '</select>\n      '
        switcher.innerHTML = d
    }
}

function ext_has_css_set() {
    // is the original style set? if so: dust it:
    let a = document.getElementById('asciidoctor-browser-style')
    if (a && a.href && a.href.indexOf('chrome') > -1) return true
    return false
}

function insert_ctheme_txt() {
    return insert_theme_txt(this.responseText, 'code', true)
}
function insert_theme_txt(txt, typ, sync_or_code) {
    if (!sync_or_code) {
        typ = 'adoc'
        txt = this.responseText
    } // async return for adoc
    if (typ == 'adoc' && D.TH.has_css_set) {
        function rmorigcss() {
            let a = document.getElementById('asciidoctor-browser-style')
            if (!a) {
                // not yet inserted. wait, it MUST be removed, otherwise crap on the screen:
                return setTimeout(rmorigcss, 10)
            }
            a.parentElement.removeChild(a)
        }
    }

    let t = byid('theme_sel_css' + typ)
    t && t.parentElement.removeChild(t)
    let n = get_cur_theme(typ)
    t = D.createElement('style')
    t.type = 'text/css'
    t.id = 'theme_sel_css' + typ
    D.getElementsByTagName('head')[0].appendChild(t)
    // they are remote, but this is resolved to local:
    if (typ == 'adoc') {
        let ad = '@import "asciidoctor.css";'
        if (txt.indexOf(ad) > -1) txt = txt.replace(ad, ad_css)
    }
    t.appendChild(D.createTextNode(txt))
    if (typ == 'code') return
    if (!D.axattrs.themes) return

    //postprocessing - boot styles don't support toc:left. But we want it nevertheless,
    // so hammer the stuff into it (using a big hammer):
    let ta, bg
    ta = document.querySelector('#toc a')
    if (!ta) return
    // colors and style of switcher boxes, dependend on boot or not boot theme:
    let pl = ''
    let pr = ''
    bg = window.getComputedStyle(ta, null).getPropertyValue('background-color')
    byid('adoc_switcher_dropdown').style['background-color'] = bg
    byid('code_switcher_dropdown').style['background-color'] = bg
    byid('adoc_switcher_dropdown').style['border-color'] = bg
    byid('code_switcher_dropdown').style['border-color'] = bg

    if (n.indexOf('boot-') > -1) {
        pl = '10em'
        pr = '0px'
        if (n.indexOf('boot-cerulean') > -1) bg = 'gray'
        document.querySelectorAll('pre code').forEach(function(el) {
            el.style['white-space'] = 'pre'
        })

        // make the toc be vertical for boot items, otherwise they float:
        document.querySelectorAll('#toc a').forEach(function(el) {
            el.style.float = 'none'
            el.style.padding = '2px'
        })
    }
    byid('content').style['padding-left'] = pl
    byid('content').style['padding-right'] = pr
    byid('toc').style['background-color'] = bg
    byid('code_switcher').style['background-color'] = bg
    byid('adoc_switcher').style['background-color'] = bg
    let l = ['color', 'background-color']
    for (let i = 0; i < l.length; i++) {
        bg = window
            .getComputedStyle(D.getElementsByTagName('h2')[0], null)
            .getPropertyValue(l[i])
        byid('toctitle').style[l[i]] = bg
    }
}

function set_theme(theme, typ) {
    let th = D.TH[typ]
    let isinit = theme ? false : true
    let url,
        base = SERVER_URL + th.urlpth
    if (!theme) {
        url = byid(th.ext_id)
        theme = new URLSearchParams(window.location.search).get(th.query_sel)
    }
    theme = theme ? theme : get_cur_theme(typ)
    let themes = allthemes()[typ]
    if (themes && themes.indexOf(theme) < 0) return
    if (get_cur_theme(typ) == theme && !isinit) return
    remember_cur_theme(theme, typ)
    // syncronous loading of locally stored ones?
    // naa, they are cached, loaded in 1ms says network inspector, and its a meg in total:
    // let t = S.getItem('theme_' + typ + theme)
    // if (t) {
    //     insert_theme_txt(t, typ, true)
    // } else {
    let r = new XMLHttpRequest()
    let cb = typ == 'adoc' ? insert_theme_txt : insert_ctheme_txt
    r.addEventListener('load', cb)
    r.open('GET', base + theme + '.css')
    r.send()
}

function make_css_container_elmt() {
    if (D.axattrs.tocleft) {
        // css to treat toc like toc2 - fixed:
        var css = `
        #toc {z-index:100;top:10em!; right:0em!; float:none; display:block!; position:fixed!}
        body>div#content {padding-left:1em!;}
        @media only screen and (min-width:1280px){
            #toc {width:20%!;height:100%!;left:0em!;overflow:auto;top:0em!;padding-top:2em;}
            body>div#content {width:75%!;
                              max-width:none;
                              margin:0;
                              padding-right: 5em;
                              margin-left:auto!;
                              padding-left:0em!;
                              }
            }
        @media only screen and (min-width:1500px){
            body>div#content {padding-right:10em;}
            }
        @media only screen and (min-width:1750px){
            }
        #switchers {z-index:200!;width:20%!; position:fixed; bottom: 0em; left: 0em;}
        #adoc_switcher,#code_switcher {border-width:0px!}
        `.replace(/!/gi, '!important')
        //.highlight {background-color: inherit!important; border-width: 0!important}
        head = D.getElementsByTagName('head')[0]
        style = D.createElement('style')
        head.appendChild(style)
        style.type = 'text/css'
        style.appendChild(D.createTextNode(css))
    }
}

function loaded_themes() {
    // callback after load - we poll for index set in wait_rendered:
    D.TH.index = JSON.parse(this.responseText)
    console.log('have set', D.TH.index)
}
function wait_rendered() {
    // blocking for async and rendering results:
    if (!D.TH.index || !byid('content')) {
        console.log('waiting for content and theme index')
        return setTimeout(wait_rendered, 5)
    }
    if (ext_has_css_set()) D.TH.has_css_set = true
    if (D.TH.index == 'offline') return
    D.axattrs.themes && make_theme_switchers()
    // sets stored themes:
    set_theme(false, 'adoc')
    set_theme(false, 'code')
    if (D.TH.qsappend == 'local') run_qs_append_feature()
    if (D.TH.toclogo) add_toc_logo()
    add_docs_links()
}

function add_docs_links() {
    let toc = byid('toc')
    let lis = toc.getElementsByTagName('li')
    let hr,
        lnk,
        li,
        ch = false
    for (var i = 0; i < lis.length; i++) {
        li = lis[i]
        // this is a unicode block space - use this!!
        hr = li.firstElementChild
        if (ch) {
            lnk = byid(hr.href.split('#')[1])
            hr.href = lnk.firstElementChild.href
            lnk.innerHTML = ''
        }
        if (hr.innerText && hr.innerText.endsWith('──')) {
            ch = true
        }
    }
}

function add_toc_logo() {
    let img = D.createElement('img')
    img.src = D.TH.toclogo
    byid('toc').insertBefore(img, byid('toctitle'))
}
function run_qs_append_feature() {
    // query string append feature for bitbucket's fubared revision in query strings:
    function replace_link(el, attr, thishost, thisqs) {
        orig = el[attr]
        if (orig.indexOf(thishost) != 0) return
        orig = new URL(orig)
        s = orig.search.replace('?', '')
        if (s.indexOf(thisqs) == -1) {
            el[attr] = (
                el[attr].split('?', 1)[0] +
                '?' +
                s +
                '&' +
                thisqs +
                '#' +
                orig.hash
            ).replace('&&', '&')
        }
    }
    let thishost = new URL(location.href)
    let thisqs = thishost.search.replace('?', '')
    thishost = thishost.protocol + '//' + thishost.hostname
    if (!thisqs) return
    document.querySelectorAll('a').forEach(function(el) {
        replace_link(el, 'href', thishost, thisqs)
    })
    document.querySelectorAll('img').forEach(function(el) {
        replace_link(el, 'src', thishost, thisqs)
    })
}

if (D.axattrs) {
    if (D.TH.has_css_set) {
        set_theme(false, 'adoc')
        set_theme(false, 'code')
    }
    if (D.TH.toclogo) add_toc_logo()
}

if (!D.axattrs) {
    // Initial rendering, we see the source (only) now!
    // var targetNode = document.querySelector('body')
    // var observerOptions = {
    //     childList: true,
    //     attributes: true,
    //     subtree: true, //Omit or set to false to observe only changes to the parent node.
    // }
    // function callback(ml, observer) {
    //     let c = document.getElementById('content')
    //     if (window.mutated || !c) return
    //     window.mutated = true
    //     c.firstChild.innerText = 'New Title'
    // }
    // var observer = new MutationObserver(callback)
    // observer.observe(targetNode, observerOptions)
    // theme config for adoc itself and the code:
    D.TH = {
        adoc: {
            urlpth: '/stylesheets/',
            ext_id: 'asciidoctor-browser-style',
            ddtitle: 'Theme Selector (Alt-s)',
            ddid: 'adoc_switcher_dropdown',
            ddaccesskey: 's',
            query_sel: 'theme',
        },
        code: {
            urlpth: '/highlightjs/',
            ext_id: 'asciidoctor-browser-github-highlight-style',
            ddtitle: 'Code Selector (Alt-c)',
            ddid: 'code_switcher_dropdown',
            ddaccesskey: 'c',
            query_sel: 'ctheme',
        },
        index: false, // from server
        has_css_set: false, // will be inserted again and again.
        qsappend: false,
    }

    // // var docs = docbody().innerText.split('// DOCS: ')[1]
    // if (docs) D.TH.docs = JSON.parse(docs)

    // query string append feature for bitbucket (via doc or query string, when otherwise hosted):
    D.TH.qsappend = is_set(':qsappend: local') ? 'local' : false
    if (location.href.indexOf('qsappend=local') > -1) D.TH.qsappend = 'local'

    let tocleft =
        TOC_LEFT == 'never'
            ? false
            : TOC_LEFT == ':toc: left' && is_set(':toc: left')
            ? true
            : TOC_LEFT == ':toc:' && is_set(':toc:')
            ? true
            : true
    let themes =
        THEMES == 'never' ? false : THEMES == 'always' ? true : is_set(':themes:')

    D.axattrs = {tocleft: tocleft, themes: themes}
    if (themes) {
        function offline() {
            D.TH.index = 'offline'
        }
        // make the switchers, add all available themes into them, from the server:
        let r = new XMLHttpRequest()
        r.addEventListener('load', loaded_themes)
        r.addEventListener('abort', offline)
        r.addEventListener('error', offline) // won't see those, the extension is overwriting xhr
        r.open('GET', SERVER_URL + '/index.txt')
        r.send()
    } else {
        D.TH.index = 'n.a.'
    }
    D.TH['toclogo'] = is_set(':toclogo:', true)
    make_css_container_elmt()
    //
    // many styles import this, and we pull from remote so we would not get them:
    // don't want to change the css-es for the skins
    var ad_css = String.raw`
/* Asciidoctor default stylesheet | MIT License | http://asciidoctor.org *//* Remove comment around @import statement below when using as a custom stylesheet *//*@import "https://fonts.googleapis.com/css?family=Open+Sans:300,300italic,400,400italic,600,600italic%7CNoto+Serif:400,400italic,700,700italic%7CDroid+Sans+Mono:400,700";*/article,aside,details,figcaption,figure,footer,header,hgroup,main,nav,section,summary{display:block}audio,canvas,video{display:inline-block}audio:not([controls]){display:none;height:0}[hidden],template{display:none}script{display:none!important}html{font-family:sans-serif;-ms-text-size-adjust:100%;-webkit-text-size-adjust:100%}body{margin:0}a{background:transparent}a:focus{outline:thin dotted}a:active,a:hover{outline:0}h1{font-size:2em;margin:.67em 0}abbr[title]{border-bottom:1px dotted}b,strong{font-weight:bold}dfn{font-style:italic}hr{-moz-box-sizing:content-box;box-sizing:content-box;height:0}mark{background:#ff0;color:#000}code,kbd,pre,samp{font-family:monospace;font-size:1em}pre{white-space:pre-wrap}q{quotes:"\201C" "\201D" "\2018" "\2019"}small{font-size:80%}sub,sup{font-size:75%;line-height:0;position:relative;vertical-align:baseline}sup{top:-.5em}sub{bottom:-.25em}img{border:0}svg:not(:root){overflow:hidden}figure{margin:0}fieldset{border:1px solid silver;margin:0 2px;padding:.35em .625em .75em}legend{border:0;padding:0}button,input,select,textarea{font-family:inherit;font-size:100%;margin:0}button,input{line-height:normal}button,select{text-transform:none}button,html input[type="button"],input[type="reset"],input[type="submit"]{-webkit-appearance:button;cursor:pointer}button[disabled],html input[disabled]{cursor:default}input[type="checkbox"],input[type="radio"]{box-sizing:border-box;padding:0}input[type="search"]{-webkit-appearance:textfield;-moz-box-sizing:content-box;-webkit-box-sizing:content-box;box-sizing:content-box}input[type="search"]::-webkit-search-cancel-button,input[type="search"]::-webkit-search-decoration{-webkit-appearance:none}button::-moz-focus-inner,input::-moz-focus-inner{border:0;padding:0}textarea{overflow:auto;vertical-align:top}table{border-collapse:collapse;border-spacing:0}*,*:before,*:after{-moz-box-sizing:border-box;-webkit-box-sizing:border-box;box-sizing:border-box}html,body{font-size:100%}body{background:#fff;color:rgba(0,0,0,.8);padding:0;margin:0;font-family:"Noto Serif","DejaVu Serif",serif;font-weight:400;font-style:normal;line-height:1;position:relative;cursor:auto}a:hover{cursor:pointer}img,object,embed{max-width:100%;height:auto}object,embed{height:100%}img{-ms-interpolation-mode:bicubic}.left{float:left!important}.right{float:right!important}.text-left{text-align:left!important}.text-right{text-align:right!important}.text-center{text-align:center!important}.text-justify{text-align:justify!important}.hide{display:none}body{-webkit-font-smoothing:antialiased}img,object,svg{display:inline-block;vertical-align:middle}textarea{height:auto;min-height:50px}select{width:100%}.center{margin-left:auto;margin-right:auto}.spread{width:100%}p.lead,.paragraph.lead>p,#preamble>.sectionbody>.paragraph:first-of-type p{font-size:1.21875em;line-height:1.6}.subheader,.admonitionblock td.content>.title,.audioblock>.title,.exampleblock>.title,.imageblock>.title,.listingblock>.title,.literalblock>.title,.stemblock>.title,.openblock>.title,.paragraph>.title,.quoteblock>.title,table.tableblock>.title,.verseblock>.title,.videoblock>.title,.dlist>.title,.olist>.title,.ulist>.title,.qlist>.title,.hdlist>.title{line-height:1.45;color:#7a2518;font-weight:400;margin-top:0;margin-bottom:.25em}div,dl,dt,dd,ul,ol,li,h1,h2,h3,#toctitle,.sidebarblock>.content>.title,h4,h5,h6,pre,form,p,blockquote,th,td{margin:0;padding:0;direction:ltr}a{color:#2156a5;text-decoration:underline;line-height:inherit}a:hover,a:focus{color:#1d4b8f}a img{border:none}p{font-family:inherit;font-weight:400;font-size:1em;line-height:1.6;margin-bottom:1.25em;text-rendering:optimizeLegibility}p aside{font-size:.875em;line-height:1.35;font-style:italic}h1,h2,h3,#toctitle,.sidebarblock>.content>.title,h4,h5,h6{font-family:"Open Sans","DejaVu Sans",sans-serif;font-weight:300;font-style:normal;color:#ba3925;text-rendering:optimizeLegibility;margin-top:1em;margin-bottom:.5em;line-height:1.0125em}h1 small,h2 small,h3 small,#toctitle small,.sidebarblock>.content>.title small,h4 small,h5 small,h6 small{font-size:60%;color:#e99b8f;line-height:0}h1{font-size:2.125em}h2{font-size:1.6875em}h3,#toctitle,.sidebarblock>.content>.title{font-size:1.375em}h4,h5{font-size:1.125em}h6{font-size:1em}hr{border:solid #ddddd8;border-width:1px 0 0;clear:both;margin:1.25em 0 1.1875em;height:0}em,i{font-style:italic;line-height:inherit}strong,b{font-weight:bold;line-height:inherit}small{font-size:60%;line-height:inherit}code{font-family:"Droid Sans Mono","DejaVu Sans Mono",monospace;font-weight:400;color:rgba(0,0,0,.9)}ul,ol,dl{font-size:1em;line-height:1.6;margin-bottom:1.25em;list-style-position:outside;font-family:inherit}ul,ol,ul.no-bullet,ol.no-bullet{margin-left:1.5em}ul li ul,ul li ol{margin-left:1.25em;margin-bottom:0;font-size:1em}ul.square li ul,ul.circle li ul,ul.disc li ul{list-style:inherit}ul.square{list-style-type:square}ul.circle{list-style-type:circle}ul.disc{list-style-type:disc}ul.no-bullet{list-style:none}ol li ul,ol li ol{margin-left:1.25em;margin-bottom:0}dl dt{margin-bottom:.3125em;font-weight:bold}dl dd{margin-bottom:1.25em}abbr,acronym{text-transform:uppercase;font-size:90%;color:rgba(0,0,0,.8);border-bottom:1px dotted #ddd;cursor:help}abbr{text-transform:none}blockquote{margin:0 0 1.25em;padding:.5625em 1.25em 0 1.1875em;border-left:1px solid #ddd}blockquote cite{display:block;font-size:.9375em;color:rgba(0,0,0,.6)}blockquote cite:before{content:"\2014 \0020"}blockquote cite a,blockquote cite a:visited{color:rgba(0,0,0,.6)}blockquote,blockquote p{line-height:1.6;color:rgba(0,0,0,.85)}@media only screen and 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