From c58246efe47bea09d4f3e70f536e4c9bb7770749 Mon Sep 17 00:00:00 2001
From: Michael Howell <michael@notriddle.com>
Date: Fri, 16 Jul 2021 17:24:35 -0700
Subject: [PATCH] Rustdoc accessibility: use an icon for the [-]/[+] controls

This way, we can show the plus and minus buttons on screens, while voice
control will read off actual words "Collapse" and "Expand" instead of reading
"open brace minus close brace" and "open brace plus close brace".

Part of #87059
---
 src/librustdoc/html/render/write_shared.rs    |   7 ++-
 src/librustdoc/html/static/css/rustdoc.css    |  54 ++++++++++++++++--
 src/librustdoc/html/static/css/themes/ayu.css |   5 ++
 .../html/static/css/themes/dark.css           |   5 ++
 .../html/static/images/minus-17x17.png        | Bin 0 -> 3183 bytes
 .../html/static/images/minus-17x17.png.url    |   1 +
 .../html/static/images/plus-17x17.png         | Bin 0 -> 3337 bytes
 .../html/static/images/plus-17x17.png.url     |   1 +
 src/librustdoc/html/static_files.rs           |   4 ++
 9 files changed, 69 insertions(+), 8 deletions(-)
 create mode 100644 src/librustdoc/html/static/images/minus-17x17.png
 create mode 100644 src/librustdoc/html/static/images/minus-17x17.png.url
 create mode 100644 src/librustdoc/html/static/images/plus-17x17.png
 create mode 100644 src/librustdoc/html/static/images/plus-17x17.png.url

diff --git a/src/librustdoc/html/render/write_shared.rs b/src/librustdoc/html/render/write_shared.rs
index 94a902a2d0522..f529b2f2bfcdc 100644
--- a/src/librustdoc/html/render/write_shared.rs
+++ b/src/librustdoc/html/render/write_shared.rs
@@ -126,13 +126,16 @@ impl Context<'_> {
         emit: &[EmitType],
     ) -> Result<(), Error> {
         let tmp;
+        let contents =
+            contents.replace("data-url(minus-17x17.png)", static_files::MINUS_PNG_DATAURL);
+        let contents = contents.replace("data-url(plus-17x17.png)", static_files::PLUS_PNG_DATAURL);
         let contents = if minify {
             tmp = if resource.extension() == Some(&OsStr::new("css")) {
-                minifier::css::minify(contents).map_err(|e| {
+                minifier::css::minify(&contents).map_err(|e| {
                     Error::new(format!("failed to minify CSS file: {}", e), resource.path(self))
                 })?
             } else {
-                minifier::js::minify(contents)
+                minifier::js::minify(&contents)
             };
             tmp.as_bytes()
         } else {
diff --git a/src/librustdoc/html/static/css/rustdoc.css b/src/librustdoc/html/static/css/rustdoc.css
index 91243a4086ced..ae321be09e228 100644
--- a/src/librustdoc/html/static/css/rustdoc.css
+++ b/src/librustdoc/html/static/css/rustdoc.css
@@ -1508,11 +1508,33 @@ details.rustdoc-toggle > summary.hideme > span {
 }
 
 details.rustdoc-toggle > summary::before {
-	content: "[+]";
+	content: "Expand";
 	font-weight: 300;
 	font-size: 0.8em;
 	letter-spacing: 1px;
 	cursor: pointer;
+	width: 17px;
+	height: max(17px, 1.1em);
+	background: data-url(plus-17x17.png) no-repeat top left;
+	display: inline-block;
+	vertical-align: middle;
+	opacity: .5;
+	text-indent: 17px;
+	overflow: hidden;
+}
+
+details.rustdoc-toggle > summary.hideme::before {
+	/* "hideme" toggles already have a description when they're contracted */
+	content: " ";
+}
+
+details.rustdoc-toggle > summary:focus::before {
+	outline: dotted 1px;
+}
+
+details.rustdoc-toggle > summary:focus::before,
+details.rustdoc-toggle > summary:hover::before {
+	opacity: 1;
 }
 
 details.rustdoc-toggle.top-doc > summary,
@@ -1560,20 +1582,40 @@ details.rustdoc-toggle[open] > summary.hideme > span {
 	display: none;
 }
 
-details.rustdoc-toggle[open] > summary::before {
-	content: "[−]";
-	display: inline;
+details.rustdoc-toggle[open] > summary::before,
+details.rustdoc-toggle[open] > summary.hideme::before {
+	width: 17px;
+	height: max(17px, 1.1em);
+	background: data-url(minus-17x17.png) no-repeat top left;
+	display: inline-block;
+	content: "Collapse";
 }
 
 details.undocumented > summary::before {
-	content: "[+] Show hidden undocumented items";
+	padding-left: 17px;
+	height: max(17px, 1.1em);
+	background: data-url(plus-17x17.png) no-repeat top left;
+	content: "Show hidden undocumented items";
 	cursor: pointer;
 	font-size: 16px;
 	font-weight: 300;
+	opacity: .5;
+}
+
+details.undocumented > summary:focus::before {
+	outline: dotted 1px;
+}
+
+details.undocumented > summary:focus::before,
+details.undocumented > summary:hover::before {
+	opacity: 1;
 }
 
 details.undocumented[open] > summary::before {
-	content: "[−] Hide undocumented items";
+	padding-left: 17px;
+	height: max(17px, 1.1em);
+	background: data-url(minus-17x17.png) no-repeat top left;
+	content: "Hide undocumented items";
 }
 
 /* Media Queries */
diff --git a/src/librustdoc/html/static/css/themes/ayu.css b/src/librustdoc/html/static/css/themes/ayu.css
index df386fb66a33f..849924ea5501e 100644
--- a/src/librustdoc/html/static/css/themes/ayu.css
+++ b/src/librustdoc/html/static/css/themes/ayu.css
@@ -229,6 +229,11 @@ details.undocumented > summary::before {
 	color: #999;
 }
 
+details.rustdoc-toggle > summary::before,
+details.undocumented > summary::before {
+	filter: invert(100%);
+}
+
 #crate-search {
 	color: #c5c5c5;
 	background-color: #141920;
diff --git a/src/librustdoc/html/static/css/themes/dark.css b/src/librustdoc/html/static/css/themes/dark.css
index c8a5dbdc66aaf..c26122e4bffb5 100644
--- a/src/librustdoc/html/static/css/themes/dark.css
+++ b/src/librustdoc/html/static/css/themes/dark.css
@@ -194,6 +194,11 @@ details.undocumented > summary::before {
 	color: #999;
 }
 
+details.rustdoc-toggle > summary::before,
+details.undocumented > summary::before {
+	filter: invert(100%);
+}
+
 #crate-search {
 	color: #111;
 	background-color: #f0f0f0;
diff --git a/src/librustdoc/html/static/images/minus-17x17.png b/src/librustdoc/html/static/images/minus-17x17.png
new file mode 100644
index 0000000000000000000000000000000000000000..3cdbbf5033ec412df28970edfc6da26d578252bf
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diff --git a/src/librustdoc/html/static/images/minus-17x17.png.url b/src/librustdoc/html/static/images/minus-17x17.png.url
new file mode 100644
index 0000000000000..a05bac5d875c5
--- /dev/null
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new file mode 100644
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+++ b/src/librustdoc/html/static/images/plus-17x17.png.url
@@ -0,0 +1 @@
+url(data:image/png;base64,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)
diff --git a/src/librustdoc/html/static_files.rs b/src/librustdoc/html/static_files.rs
index 2ec7e66234ddd..db34d60638e8a 100644
--- a/src/librustdoc/html/static_files.rs
+++ b/src/librustdoc/html/static_files.rs
@@ -64,6 +64,10 @@ crate static RUST_FAVICON_SVG: &[u8] = include_bytes!("static/images/favicon.svg
 crate static RUST_FAVICON_PNG_16: &[u8] = include_bytes!("static/images/favicon-16x16.png");
 crate static RUST_FAVICON_PNG_32: &[u8] = include_bytes!("static/images/favicon-32x32.png");
 
+/// The pixel art buttons
+crate static MINUS_PNG_DATAURL: &str = include_str!("static/images/minus-17x17.png.url");
+crate static PLUS_PNG_DATAURL: &str = include_str!("static/images/plus-17x17.png.url");
+
 crate static PAGE: &str = include_str!("templates/page.html");
 
 /// The built-in themes given to every documentation site.