Auto merge of rust-lang#130069 - GuillaumeGomez:gen-scraped-buttons, r=notriddle

Generate scraped examples buttons in JS

Follow-up of rust-lang#129796.

To reduce the page size when there are scraped examples, we can generate their buttons in JS since they require JS to work in any case. There should be no changes in display or in functionality.

You can test it [here](https://rustdoc.crud.net/imperio/gen-scraped-buttons/doc/scrape_examples/fn.test.html).

cc `@willcrichton`
r? `@notriddle`

Author: bors

Diff for: src/librustdoc/html/render/mod.rs

@@ -2538,7 +2538,6 @@ fn render_call_locations<W: fmt::Write>(mut w: W, cx: &mut Context<'_>, item: &c
             &cx.root_path(),
             highlight::DecorationInfo(decoration_info),
             sources::SourceContext::Embedded(sources::ScrapedInfo {
-                needs_prev_next_buttons: line_ranges.len() > 1,
                 needs_expansion,
                 offset: line_min,
                 name: &call_data.display_name,

Diff for: src/librustdoc/html/sources.rs

@@ -292,7 +292,6 @@ where
 
 pub(crate) struct ScrapedInfo<'a> {
     pub(crate) offset: usize,
-    pub(crate) needs_prev_next_buttons: bool,
     pub(crate) name: &'a str,
     pub(crate) url: &'a str,
     pub(crate) title: &'a str,

Diff for: src/librustdoc/html/static/js/main.js

@@ -1855,12 +1855,8 @@ href="https://doc.rust-lang.org/${channel}/rustdoc/read-documentation/search.htm
         // Since the button will be added, no need to keep this listener around.
         elem.removeEventListener("mouseover", addCopyButton);
 
-        // If this is a scrapped example, there will already be a "button-holder" element.
-        let parent = elem.querySelector(".button-holder");
-        if (!parent) {
-            parent = document.createElement("div");
-            parent.className = "button-holder";
-        }
+        const parent = document.createElement("div");
+        parent.className = "button-holder";
 
         const runButton = elem.querySelector(".test-arrow");
         if (runButton !== null) {
@@ -1876,6 +1872,12 @@ href="https://doc.rust-lang.org/${channel}/rustdoc/read-documentation/search.htm
             copyButtonAnimation(copyButton);
         });
         parent.appendChild(copyButton);
+
+        if (!elem.parentElement.classList.contains("scraped-example")) {
+            return;
+        }
+        const scrapedWrapped = elem.parentElement;
+        window.updateScrapedExample(scrapedWrapped, parent);
     }
 
     function showHideCodeExampleButtons(event) {

Diff for: src/librustdoc/html/static/js/scrape-examples.js

@@ -36,13 +36,30 @@
         elt.querySelector(".rust").scrollTo(0, scrollOffset);
     }
 
-    function updateScrapedExample(example, isHidden) {
-        const locs = JSON.parse(example.attributes.getNamedItem("data-locs").textContent);
+    function createScrapeButton(parent, className, content) {
+        const button = document.createElement("button");
+        button.className = className;
+        button.innerText = content;
+        parent.insertBefore(button, parent.firstChild);
+        return button;
+    }
+
+    window.updateScrapedExample = (example, buttonHolder) => {
         let locIndex = 0;
         const highlights = Array.prototype.slice.call(example.querySelectorAll(".highlight"));
         const link = example.querySelector(".scraped-example-title a");
+        let expandButton = null;
+
+        if (!example.classList.contains("expanded")) {
+            expandButton = createScrapeButton(buttonHolder, "expand", "↕");
+        }
+        const isHidden = example.parentElement.classList.contains("more-scraped-examples");
 
+        const locs = example.locs;
         if (locs.length > 1) {
+            const next = createScrapeButton(buttonHolder, "next", "≻");
+            const prev = createScrapeButton(buttonHolder, "prev", "≺");
+
             // Toggle through list of examples in a given file
             const onChangeLoc = changeIndex => {
                 removeClass(highlights[locIndex], "focus");
@@ -57,22 +74,19 @@
                 link.innerHTML = title;
             };
 
-            example.querySelector(".prev")
-                .addEventListener("click", () => {
-                    onChangeLoc(() => {
-                        locIndex = (locIndex - 1 + locs.length) % locs.length;
-                    });
+            prev.addEventListener("click", () => {
+                onChangeLoc(() => {
+                    locIndex = (locIndex - 1 + locs.length) % locs.length;
                 });
+            });
 
-            example.querySelector(".next")
-                .addEventListener("click", () => {
-                    onChangeLoc(() => {
-                        locIndex = (locIndex + 1) % locs.length;
-                    });
+            next.addEventListener("click", () => {
+                onChangeLoc(() => {
+                    locIndex = (locIndex + 1) % locs.length;
                 });
+            });
         }
 
-        const expandButton = example.querySelector(".expand");
         if (expandButton) {
             expandButton.addEventListener("click", () => {
                 if (hasClass(example, "expanded")) {
@@ -83,13 +97,16 @@
                 }
             });
         }
+    };
 
+    function setupLoc(example, isHidden) {
+        example.locs = JSON.parse(example.attributes.getNamedItem("data-locs").textContent);
         // Start with the first example in view
-        scrollToLoc(example, locs[0][0], isHidden);
+        scrollToLoc(example, example.locs[0][0], isHidden);
     }
 
     const firstExamples = document.querySelectorAll(".scraped-example-list > .scraped-example");
-    onEachLazy(firstExamples, el => updateScrapedExample(el, false));
+    onEachLazy(firstExamples, el => setupLoc(el, false));
     onEachLazy(document.querySelectorAll(".more-examples-toggle"), toggle => {
         // Allow users to click the left border of the <details> section to close it,
         // since the section can be large and finding the [+] button is annoying.
@@ -102,11 +119,11 @@
         const moreExamples = toggle.querySelectorAll(".scraped-example");
         toggle.querySelector("summary").addEventListener("click", () => {
             // Wrapping in setTimeout ensures the update happens after the elements are actually
-            // visible. This is necessary since updateScrapedExample calls scrollToLoc which
+            // visible. This is necessary since setupLoc calls scrollToLoc which
             // depends on offsetHeight, a property that requires an element to be visible to
             // compute correctly.
             setTimeout(() => {
-                onEachLazy(moreExamples, el => updateScrapedExample(el, true));
+                onEachLazy(moreExamples, el => setupLoc(el, true));
             });
         }, {once: true});
     });

Diff for: src/librustdoc/html/templates/scraped_source.html

@@ -1,8 +1,8 @@
 <div class="scraped-example{% if !info.needs_expansion +%} expanded{% endif %}" data-locs="{{info.locations}}"> {# #}
     <div class="scraped-example-title">
        {{info.name +}} (<a href="{{info.url}}">{{info.title}}</a>) {# #}
-    </div>
-    <div class="example-wrap"> {# #}
+    </div> {# #}
+    <div class="example-wrap">
         {# https://developers.google.com/search/docs/crawling-indexing/robots-meta-tag#data-nosnippet-attr
            Do not show "1 2 3 4 5 ..." in web search results. #}
         <div class="src-line-numbers" data-nosnippet> {# #}
@@ -18,16 +18,5 @@
                 {{code_html|safe}}
             </code> {# #}
         </pre> {# #}
-        {% if info.needs_prev_next_buttons || info.needs_expansion %}
-            <div class="button-holder">
-                {% if info.needs_prev_next_buttons %}
-                    <button class="prev">&pr;</button> {# #}
-                    <button class="next">&sc;</button>
-                {% endif %}
-                {% if info.needs_expansion %}
-                    <button class="expand">&varr;</button>
-                {% endif %}
-            </div>
-        {% endif %}
     </div> {# #}
 </div> {# #}