custom.js

// These two things need to be updated at each release for the version selector.
// Last stable version
const stableVersion = "v3.0.0"
// Dictionary doc folder to label
const versionMapping = {
    "master": "master",
    "": "v3.0.0 (stable)",
    "v2.11.0": "v2.11.0",
    "v2.10.0": "v2.10.0",
    "v2.9.1": "v2.9.0/v2.9.1",
    "v2.8.0": "v2.8.0",
    "v2.7.0": "v2.7.0",
    "v2.6.0": "v2.6.0",
    "v2.5.1": "v2.5.0/v2.5.1",
    "v2.4.0": "v2.4.0/v2.4.1",
    "v2.3.0": "v2.3.0",
    "v2.2.0": "v2.2.0/v2.2.1/v2.2.2",
    "v2.1.1": "v2.1.1",
    "v2.0.0": "v2.0.0",
    "v1.2.0": "v1.2.0",
    "v1.1.0": "v1.1.0",
    "v1.0.0": "v1.0.0"
}

function addIcon() {
    const huggingFaceLogo = "https://huggingface.co/landing/assets/transformers-docs/huggingface_logo.svg";
    const image = document.createElement("img");
    image.setAttribute("src", huggingFaceLogo);

    const div = document.createElement("div");
    div.appendChild(image);
    div.style.textAlign = 'center';
    div.style.paddingTop = '30px';
    div.style.backgroundColor = '#6670FF';

    const scrollDiv = document.querySelector(".wy-side-scroll");
    scrollDiv.prepend(div);
}

function addCustomFooter() {
    const customFooter = document.createElement("div");
    const questionOrIssue = document.createElement("div");
    questionOrIssue.innerHTML = "Stuck? Read our <a href='https://medium.com/huggingface'>Blog posts</a> or <a href='https://github.com/huggingface/transformers'>Create an issue</a>";
    customFooter.appendChild(questionOrIssue);
    customFooter.classList.add("footer");

    const social = document.createElement("div");
    social.classList.add("footer__Social");

    const imageDetails = [
        { link: "https://huggingface.co", imageLink: "https://huggingface.co/landing/assets/transformers-docs/website.svg" },
        { link: "https://twitter.com/huggingface", imageLink: "https://huggingface.co/landing/assets/transformers-docs/twitter.svg" },
        { link: "https://github.com/huggingface", imageLink: "https://huggingface.co/landing/assets/transformers-docs/github.svg" },
        { link: "https://www.linkedin.com/company/huggingface/", imageLink: "https://huggingface.co/landing/assets/transformers-docs/linkedin.svg" }
    ];

    imageDetails.forEach(imageLinks => {
        const link = document.createElement("a");
        const image = document.createElement("img");
        image.src = imageLinks.imageLink;
        link.href = imageLinks.link;
        image.style.width = "30px";
        image.classList.add("footer__CustomImage");
        link.appendChild(image);
        social.appendChild(link);
    });

    customFooter.appendChild(social);
    document.querySelector("footer").appendChild(customFooter);
}

function addGithubButton() {
    const div = `
        <div class="github-repo">
            <a 
                class="github-button"
                href="https://github.com/huggingface/transformers" data-size="large" data-show-count="true" aria-label="Star huggingface/pytorch-transformers on GitHub">
                Star
            </a>
        </div>
    `;
    document.querySelector(".wy-side-nav-search .icon-home").insertAdjacentHTML('afterend', div);
}

function addVersionControl() {
    // To grab the version currently in view, we parse the url
    const parts = location.toString().split('/');
    let versionIndex = parts.length - 2;
    // Index page may not have a last part with filename.html so we need to go up
    if (parts[parts.length - 1] != "" && ! parts[parts.length - 1].match(/\.html$|^search.html?/)) {
        versionIndex = parts.length - 1;
    }
    // Main classes and models are nested so we need to go deeper
    else if (parts[versionIndex] == "main_classes" || parts[versionIndex] == "model_doc") {
        versionIndex = versionIndex - 1;
    } 
    const version = parts[versionIndex];

    // Menu with all the links,
    const versionMenu = document.createElement("div");

    const htmlLines = [];
    for (const [key, value] of Object.entries(versionMapping)) {
        let baseUrlIndex = (version == "transformers") ? versionIndex + 1: versionIndex;
        var urlParts = parts.slice(0, baseUrlIndex);
        if (key != "") {
            urlParts = urlParts.concat([key]);
        }
        urlParts = urlParts.concat(parts.slice(versionIndex+1));
        htmlLines.push(`<a href="${urlParts.join('/')}">${value}</a>`);
    }

    versionMenu.classList.add("version-dropdown");
    versionMenu.innerHTML = htmlLines.join('\n');
    
    // Button for version selection
    const versionButton = document.createElement("div");
    versionButton.classList.add("version-button");
    let label = (version == "transformers") ? stableVersion : version
    versionButton.innerText = label.concat(" ▼");

    // Toggle the menu when we click on the button
    versionButton.addEventListener("click", () => {
        versionMenu.classList.toggle("version-show");
    });

    // Hide the menu when we click elsewhere
    window.addEventListener("click", (event) => {
        if (event.target != versionButton){
            versionMenu.classList.remove('version-show');
        }
    });

    // Container
    const div = document.createElement("div");
    div.appendChild(versionButton);
    div.appendChild(versionMenu);
    div.style.paddingTop = '25px';
    div.style.backgroundColor = '#6670FF';
    div.style.display = 'block';
    div.style.textAlign = 'center';

    const scrollDiv = document.querySelector(".wy-side-scroll");
    scrollDiv.insertBefore(div, scrollDiv.children[1]);
}

function addHfMenu() {
    const div = `
    <div class="menu">
        <a href="/welcome">🔥 Sign in</a>
        <a href="/models">🚀 Models</a>
    </div>
    `;
    document.body.insertAdjacentHTML('afterbegin', div);
}

function platformToggle() {
    const codeBlocks = Array.from(document.getElementsByClassName("highlight"));
    const pytorchIdentifier = "## PYTORCH CODE";
    const tensorflowIdentifier = "## TENSORFLOW CODE";

    const promptSpanIdentifier = `<span class="gp">&gt;&gt;&gt; </span>`
    const pytorchSpanIdentifier = `<span class="c1">${pytorchIdentifier}</span>`;
    const tensorflowSpanIdentifier = `<span class="c1">${tensorflowIdentifier}</span>`;

    const getFrameworkSpans = filteredCodeBlock => {
        const spans = filteredCodeBlock.element.innerHTML;
        const pytorchSpanPosition = spans.indexOf(pytorchSpanIdentifier);
        const tensorflowSpanPosition = spans.indexOf(tensorflowSpanIdentifier);

        let pytorchSpans;
        let tensorflowSpans;

        if(pytorchSpanPosition < tensorflowSpanPosition){
            const isPrompt = spans.slice(
                spans.indexOf(tensorflowSpanIdentifier) - promptSpanIdentifier.length,
                spans.indexOf(tensorflowSpanIdentifier)
            ) == promptSpanIdentifier;
            const finalTensorflowSpanPosition = isPrompt ? tensorflowSpanPosition - promptSpanIdentifier.length : tensorflowSpanPosition;

            pytorchSpans = spans.slice(pytorchSpanPosition + pytorchSpanIdentifier.length + 1, finalTensorflowSpanPosition);
            tensorflowSpans = spans.slice(tensorflowSpanPosition + tensorflowSpanIdentifier.length + 1, spans.length);
        }else{
            const isPrompt = spans.slice(
                spans.indexOf(pytorchSpanIdentifier) - promptSpanIdentifier.length,
                spans.indexOf(pytorchSpanIdentifier)
            ) == promptSpanIdentifier;
            const finalPytorchSpanPosition = isPrompt ? pytorchSpanPosition - promptSpanIdentifier.length : pytorchSpanPosition;

            tensorflowSpans = spans.slice(tensorflowSpanPosition + tensorflowSpanIdentifier.length + 1, finalPytorchSpanPosition);
            pytorchSpans = spans.slice(pytorchSpanPosition + pytorchSpanIdentifier.length + 1, spans.length);
        }

        return {
            ...filteredCodeBlock,
            pytorchSample: pytorchSpans ,
            tensorflowSample: tensorflowSpans
        }
    };

    const createFrameworkButtons = sample => {
            const pytorchButton = document.createElement("button");
            pytorchButton.innerText = "PyTorch";

            const tensorflowButton = document.createElement("button");
            tensorflowButton.innerText = "TensorFlow";

            const selectorDiv = document.createElement("div");
            selectorDiv.classList.add("framework-selector");
            selectorDiv.appendChild(pytorchButton);
            selectorDiv.appendChild(tensorflowButton);
            sample.element.parentElement.prepend(selectorDiv);

            // Init on PyTorch
            sample.element.innerHTML = sample.pytorchSample;
            pytorchButton.classList.add("selected");
            tensorflowButton.classList.remove("selected");

            pytorchButton.addEventListener("click", () => {
                sample.element.innerHTML = sample.pytorchSample;
                pytorchButton.classList.add("selected");
                tensorflowButton.classList.remove("selected");
            });
            tensorflowButton.addEventListener("click", () => {
               sample.element.innerHTML = sample.tensorflowSample;
                tensorflowButton.classList.add("selected");
                pytorchButton.classList.remove("selected");
            });
        };

    codeBlocks
        .map(element => {return {element: element.firstChild, innerText: element.innerText}})
        .filter(codeBlock => codeBlock.innerText.includes(pytorchIdentifier) && codeBlock.innerText.includes(tensorflowIdentifier))
        .map(getFrameworkSpans)
        .forEach(createFrameworkButtons);
}


/*!
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 * (c) 2019 なつき
 * @license BSD-2-Clause
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function onLoad() {
    addIcon();
    addVersionControl();
    addCustomFooter();
    addGithubButton();
    parseGithubButtons();
    addHfMenu();
    platformToggle();
}

window.addEventListener("load", onLoad);