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Rollup merge of rust-lang#66828 - GuillaumeGomez:less-minification, r…
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…=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
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@JohnTitor
JohnTitor authored Dec 5, 2019
2 parents b4e4707 + 2d0f0ca commit ac97356
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Showing 2 changed files with 14 additions and 91 deletions.
103 changes: 13 additions & 90 deletions src/librustdoc/html/render.rs
View file
Original file line number Diff line number Diff line change
Expand Up @@ -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)?;
Expand Down Expand Up @@ -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;
}
Expand All @@ -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 {
Expand All @@ -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() {
Expand Down Expand Up @@ -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()));
Expand All @@ -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 {
Expand Down Expand Up @@ -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.
Expand Down Expand Up @@ -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,
Expand Down
2 changes: 1 addition & 1 deletion src/librustdoc/html/static/main.js
View file
Original file line number Diff line number Diff line change
Expand Up @@ -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)) {
Expand Down

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