Auto merge of #66828 - GuillaumeGomez:less-minification, r=kinnison

Less minification

The goal of this PR is to remove the minification process on the `search-index.js` file. It provides great result in term of space reduction but the computation time is far too long. I'll work on this issue and will put it back once it's fast enough.

cc @nox @lqd
r? @kinnison

Author: bors

src/librustdoc/html/render.rs

@@ -644,10 +644,9 @@ themePicker.onblur = handleThemeButtonsBlur;
     themes.appendChild(but);
 }});"#,
                  as_json(&themes));
-    write(cx.dst.join(&format!("theme{}.js", cx.shared.resource_suffix)),
-          theme_js.as_bytes()
-    )?;
-
+    write_minify(&cx.shared.fs, cx.path("theme.js"),
+                 &theme_js,
+                 options.enable_minification)?;
     write_minify(&cx.shared.fs, cx.path("main.js"),
                  static_files::MAIN_JS,
                  options.enable_minification)?;
@@ -715,19 +714,13 @@ themePicker.onblur = handleThemeButtonsBlur;
         path: &Path,
         krate: &str,
         key: &str,
-        for_search_index: bool,
-    ) -> io::Result<(Vec<String>, Vec<String>, Vec<String>)> {
+    ) -> io::Result<(Vec<String>, Vec<String>)> {
         let mut ret = Vec::new();
         let mut krates = Vec::new();
-        let mut variables = Vec::new();
 
         if path.exists() {
             for line in BufReader::new(File::open(path)?).lines() {
                 let line = line?;
-                if for_search_index && line.starts_with("var R") {
-                    variables.push(line.clone());
-                    continue;
-                }
                 if !line.starts_with(key) {
                     continue;
                 }
@@ -741,7 +734,7 @@ themePicker.onblur = handleThemeButtonsBlur;
                                                  .unwrap_or_else(|| String::new()));
             }
         }
-        Ok((ret, krates, variables))
+        Ok((ret, krates))
     }
 
     fn show_item(item: &IndexItem, krate: &str) -> String {
@@ -756,7 +749,7 @@ themePicker.onblur = handleThemeButtonsBlur;
 
     let dst = cx.dst.join(&format!("aliases{}.js", cx.shared.resource_suffix));
     {
-        let (mut all_aliases, _, _) = try_err!(collect(&dst, &krate.name, "ALIASES", false), &dst);
+        let (mut all_aliases, _) = try_err!(collect(&dst, &krate.name, "ALIASES"), &dst);
         let mut output = String::with_capacity(100);
         for (alias, items) in &cx.cache.aliases {
             if items.is_empty() {
@@ -853,9 +846,7 @@ themePicker.onblur = handleThemeButtonsBlur;
         }
 
         let dst = cx.dst.join(&format!("source-files{}.js", cx.shared.resource_suffix));
-        let (mut all_sources, _krates, _) = try_err!(collect(&dst, &krate.name, "sourcesIndex",
-                                                             false),
-                                                     &dst);
+        let (mut all_sources, _krates) = try_err!(collect(&dst, &krate.name, "sourcesIndex"), &dst);
         all_sources.push(format!("sourcesIndex[\"{}\"] = {};",
                                  &krate.name,
                                  hierarchy.to_json_string()));
@@ -867,23 +858,18 @@ themePicker.onblur = handleThemeButtonsBlur;
 
     // Update the search index
     let dst = cx.dst.join(&format!("search-index{}.js", cx.shared.resource_suffix));
-    let (mut all_indexes, mut krates, variables) = try_err!(collect(&dst,
-                                                                    &krate.name,
-                                                                    "searchIndex",
-                                                                    true), &dst);
+    let (mut all_indexes, mut krates) = try_err!(collect(&dst, &krate.name, "searchIndex"), &dst);
     all_indexes.push(search_index);
 
     // Sort the indexes by crate so the file will be generated identically even
     // with rustdoc running in parallel.
     all_indexes.sort();
     {
-        let mut v = String::from("var N=null,E=\"\",T=\"t\",U=\"u\",searchIndex={};\n");
-        v.push_str(&minify_replacer(
-            &format!("{}\n{}", variables.join(""), all_indexes.join("\n")),
-            options.enable_minification));
+        let mut v = String::from("var searchIndex={};\n");
+        v.push_str(&all_indexes.join("\n"));
         // "addSearchOptions" has to be called first so the crate filtering can be set before the
         // search might start (if it's set into the URL for example).
-        v.push_str("addSearchOptions(searchIndex);initSearch(searchIndex);");
+        v.push_str("\naddSearchOptions(searchIndex);initSearch(searchIndex);");
         cx.shared.fs.write(&dst, &v)?;
     }
     if options.enable_index_page {
@@ -981,9 +967,8 @@ themePicker.onblur = handleThemeButtonsBlur;
                             remote_item_type,
                             remote_path[remote_path.len() - 1]));
 
-        let (mut all_implementors, _, _) = try_err!(collect(&mydst, &krate.name, "implementors",
-                                                            false),
-                                                    &mydst);
+        let (mut all_implementors, _) = try_err!(collect(&mydst, &krate.name, "implementors"),
+                                                 &mydst);
         all_implementors.push(implementors);
         // Sort the implementors by crate so the file will be generated
         // identically even with rustdoc running in parallel.
@@ -1020,68 +1005,6 @@ fn write_minify(fs:&DocFS, dst: PathBuf, contents: &str, enable_minification: bo
     }
 }
 
-fn minify_replacer(
-    contents: &str,
-    enable_minification: bool,
-) -> String {
-    use minifier::js::{simple_minify, Keyword, ReservedChar, Token, Tokens};
-
-    if enable_minification {
-        let tokens: Tokens<'_> = simple_minify(contents)
-            .into_iter()
-            .filter(|(f, next)| {
-                // We keep backlines.
-                minifier::js::clean_token_except(f, next, &|c: &Token<'_>| {
-                    c.get_char() != Some(ReservedChar::Backline)
-                })
-            })
-            .map(|(f, _)| {
-                minifier::js::replace_token_with(f, &|t: &Token<'_>| {
-                    match *t {
-                        Token::Keyword(Keyword::Null) => Some(Token::Other("N")),
-                        Token::String(s) => {
-                            let s = &s[1..s.len() -1]; // The quotes are included
-                            if s.is_empty() {
-                                Some(Token::Other("E"))
-                            } else if s == "t" {
-                                Some(Token::Other("T"))
-                            } else if s == "u" {
-                                Some(Token::Other("U"))
-                            } else {
-                                None
-                            }
-                        }
-                        _ => None,
-                    }
-                })
-            })
-            .collect::<Vec<_>>()
-            .into();
-        let o = tokens.apply(|f| {
-            // We add a backline after the newly created variables.
-            minifier::js::aggregate_strings_into_array_with_separation_filter(
-                f,
-                "R",
-                Token::Char(ReservedChar::Backline),
-                // This closure prevents crates' names from being aggregated.
-                //
-                // The point here is to check if the string is preceded by '[' and
-                // "searchIndex". If so, it means this is a crate name and that it
-                // shouldn't be aggregated.
-                |tokens, pos| {
-                    pos < 2 ||
-                    !tokens[pos - 1].eq_char(ReservedChar::OpenBracket) ||
-                    tokens[pos - 2].get_other() != Some("searchIndex")
-                }
-            )
-        })
-        .to_string();
-        format!("{}\n", o)
-    } else {
-        format!("{}\n", contents)
-    }
-}
-
 #[derive(Debug, Eq, PartialEq, Hash)]
 struct ItemEntry {
     url: String,

src/librustdoc/html/static/main.js

@@ -1221,7 +1221,7 @@ function getSearchElement() {
                     // then an exact path match
                     path.indexOf(keys[i]) > -1 ||
                     // next if there is a parent, check for exact parent match
-                    (parent !== undefined &&
+                    (parent !== undefined && parent.name !== undefined &&
                         parent.name.toLowerCase().indexOf(keys[i]) > -1) ||
                     // lastly check to see if the name was a levenshtein match
                     levenshtein(name, keys[i]) <= MAX_LEV_DISTANCE)) {