Remove direct dependencies on lazy_static, once_cell and byteorder

The functionality of all three crates is now available in the standard library.

Author: GKFX

Cargo.lock

@@ -2113,7 +2113,6 @@ dependencies = [
  "fs-err",
  "getopts",
  "jsonpath_lib",
- "once_cell",
  "regex",
  "serde_json",
  "shlex",
@@ -2232,7 +2231,6 @@ name = "linkchecker"
 version = "0.1.0"
 dependencies = [
  "html5ever",
- "once_cell",
  "regex",
 ]
 
@@ -2491,7 +2489,6 @@ dependencies = [
  "directories",
  "getrandom",
  "jemalloc-sys",
- "lazy_static",
  "libc",
  "libffi",
  "libloading",
@@ -4791,12 +4788,10 @@ dependencies = [
  "arrayvec",
  "askama",
  "base64",
- "byteorder",
  "expect-test",
  "indexmap",
  "itertools 0.12.1",
  "minifier",
- "once_cell",
  "regex",
  "rustdoc-json-types",
  "serde",
@@ -4889,7 +4884,6 @@ dependencies = [
  "getopts",
  "ignore",
  "itertools 0.11.0",
- "lazy_static",
  "regex",
  "rustfmt-config_proc_macro",
  "serde",
@@ -5351,7 +5345,6 @@ version = "0.1.0"
 dependencies = [
  "build_helper",
  "glob",
- "once_cell",
 ]
 
 [[package]]
@@ -5596,7 +5589,6 @@ version = "0.1.0"
 dependencies = [
  "cargo_metadata 0.15.4",
  "ignore",
- "lazy_static",
  "miropt-test-tools",
  "regex",
  "rustc-hash",

src/librustdoc/Cargo.toml

@@ -10,11 +10,9 @@ path = "lib.rs"
 arrayvec = { version = "0.7", default-features = false }
 askama = { version = "0.12", default-features = false, features = ["config"] }
 base64 = "0.21.7"
-byteorder = "1.5"
 itertools = "0.12"
 indexmap = "2"
 minifier = "0.3.0"
-once_cell = "1.10.0"
 regex = "1"
 rustdoc-json-types = { path = "../rustdoc-json-types" }
 serde_json = "1.0"

src/librustdoc/html/markdown.rs

@@ -35,13 +35,13 @@ use rustc_resolve::rustdoc::may_be_doc_link;
 use rustc_span::edition::Edition;
 use rustc_span::{Span, Symbol};
 
-use once_cell::sync::Lazy;
 use std::borrow::Cow;
 use std::collections::VecDeque;
 use std::fmt::Write;
 use std::iter::Peekable;
 use std::ops::{ControlFlow, Range};
 use std::str::{self, CharIndices};
+use std::sync::OnceLock;
 
 use crate::clean::RenderedLink;
 use crate::doctest;
@@ -1994,7 +1994,7 @@ pub struct IdMap {
 }
 
 // The map is pre-initialized and cloned each time to avoid reinitializing it repeatedly.
-static DEFAULT_ID_MAP: Lazy<FxHashMap<Cow<'static, str>, usize>> = Lazy::new(|| init_id_map());
+static DEFAULT_ID_MAP: OnceLock<FxHashMap<Cow<'static, str>, usize>> = OnceLock::new();
 
 fn init_id_map() -> FxHashMap<Cow<'static, str>, usize> {
     let mut map = FxHashMap::default();
@@ -2051,7 +2051,7 @@ fn init_id_map() -> FxHashMap<Cow<'static, str>, usize> {
 
 impl IdMap {
     pub fn new() -> Self {
-        IdMap { map: DEFAULT_ID_MAP.clone() }
+        IdMap { map: DEFAULT_ID_MAP.get_or_init(init_id_map).clone() }
     }
 
     pub(crate) fn derive<S: AsRef<str> + ToString>(&mut self, candidate: S) -> String {

src/librustdoc/html/render/search_index/encode.rs

@@ -166,43 +166,42 @@ pub(crate) fn write_bitmap_to_bytes(
         containers.push(container);
     }
     // https://github.com/RoaringBitmap/RoaringFormatSpec
-    use byteorder::{WriteBytesExt, LE};
     const SERIAL_COOKIE_NO_RUNCONTAINER: u32 = 12346;
     const SERIAL_COOKIE: u32 = 12347;
     const NO_OFFSET_THRESHOLD: u32 = 4;
     let size: u32 = containers.len().try_into().unwrap();
     let start_offset = if has_run {
-        out.write_u32::<LE>(SERIAL_COOKIE | ((size - 1) << 16))?;
+        out.write_all(&u32::to_le_bytes(SERIAL_COOKIE | ((size - 1) << 16)))?;
         for set in containers.chunks(8) {
             let mut b = 0;
             for (i, container) in set.iter().enumerate() {
                 if matches!(container, &Container::Run(..)) {
                     b |= 1 << i;
                 }
             }
-            out.write_u8(b)?;
+            out.write_all(&[b])?;
         }
         if size < NO_OFFSET_THRESHOLD {
             4 + 4 * size + ((size + 7) / 8)
         } else {
             4 + 8 * size + ((size + 7) / 8)
         }
     } else {
-        out.write_u32::<LE>(SERIAL_COOKIE_NO_RUNCONTAINER)?;
-        out.write_u32::<LE>(containers.len().try_into().unwrap())?;
+        out.write_all(&u32::to_le_bytes(SERIAL_COOKIE_NO_RUNCONTAINER))?;
+        out.write_all(&u32::to_le_bytes(containers.len().try_into().unwrap()))?;
         4 + 4 + 4 * size + 4 * size
     };
     for (&key, container) in keys.iter().zip(&containers) {
         // descriptive header
         let key: u32 = key.into();
         let count: u32 = container.popcount() - 1;
-        out.write_u32::<LE>((count << 16) | key)?;
+        out.write_all(&u32::to_le_bytes((count << 16) | key))?;
     }
     if !has_run || size >= NO_OFFSET_THRESHOLD {
         // offset header
         let mut starting_offset = start_offset;
         for container in &containers {
-            out.write_u32::<LE>(starting_offset)?;
+            out.write_all(&u32::to_le_bytes(starting_offset))?;
             starting_offset += match container {
                 Container::Bits(_) => 8192u32,
                 Container::Array(array) => u32::try_from(array.len()).unwrap() * 2,
@@ -214,19 +213,19 @@ pub(crate) fn write_bitmap_to_bytes(
         match container {
             Container::Bits(bits) => {
                 for chunk in bits.iter() {
-                    out.write_u64::<LE>(*chunk)?;
+                    out.write_all(&u64::to_le_bytes(*chunk))?;
                 }
             }
             Container::Array(array) => {
                 for value in array.iter() {
-                    out.write_u16::<LE>(*value)?;
+                    out.write_all(&u16::to_le_bytes(*value))?;
                 }
             }
             Container::Run(runs) => {
-                out.write_u16::<LE>((runs.len()).try_into().unwrap())?;
+                out.write_all(&u16::to_le_bytes(runs.len().try_into().unwrap()))?;
                 for (start, lenm1) in runs.iter().copied() {
-                    out.write_u16::<LE>(start)?;
-                    out.write_u16::<LE>(lenm1)?;
+                    out.write_all(&u16::to_le_bytes(start))?;
+                    out.write_all(&u16::to_le_bytes(lenm1))?;
                 }
             }
         }

src/tools/jsondocck/Cargo.toml

@@ -10,4 +10,3 @@ regex = "1.4"
 shlex = "1.0"
 serde_json = "1.0"
 fs-err = "2.5.0"
-once_cell = "1.0"

src/tools/jsondocck/src/main.rs

@@ -1,8 +1,8 @@
 use jsonpath_lib::select;
-use once_cell::sync::Lazy;
 use regex::{Regex, RegexBuilder};
 use serde_json::Value;
 use std::borrow::Cow;
+use std::sync::OnceLock;
 use std::{env, fmt, fs};
 
 mod cache;
@@ -95,7 +95,8 @@ impl fmt::Display for CommandKind {
     }
 }
 
-static LINE_PATTERN: Lazy<Regex> = Lazy::new(|| {
+static LINE_PATTERN: OnceLock<Regex> = OnceLock::new();
+fn line_pattern() -> Regex {
     RegexBuilder::new(
         r#"
         \s(?P<invalid>!?)@(?P<negated>!?)
@@ -107,7 +108,7 @@ static LINE_PATTERN: Lazy<Regex> = Lazy::new(|| {
     .unicode(true)
     .build()
     .unwrap()
-});
+}
 
 fn print_err(msg: &str, lineno: usize) {
     eprintln!("Invalid command: {} on line {}", msg, lineno)
@@ -123,7 +124,7 @@ fn get_commands(template: &str) -> Result<Vec<Command>, ()> {
     for (lineno, line) in file.split('\n').enumerate() {
         let lineno = lineno + 1;
 
-        let cap = match LINE_PATTERN.captures(line) {
+        let cap = match LINE_PATTERN.get_or_init(line_pattern).captures(line) {
             Some(c) => c,
             None => continue,
         };

src/tools/linkchecker/Cargo.toml

@@ -9,5 +9,4 @@ path = "main.rs"
 
 [dependencies]
 regex = "1"
-once_cell = "1"
 html5ever = "0.26.0"

src/tools/linkchecker/main.rs

@@ -18,8 +18,6 @@ use html5ever::tendril::ByteTendril;
 use html5ever::tokenizer::{
     BufferQueue, TagToken, Token, TokenSink, TokenSinkResult, Tokenizer, TokenizerOpts,
 };
-use once_cell::sync::Lazy;
-use regex::Regex;
 use std::cell::RefCell;
 use std::collections::{HashMap, HashSet};
 use std::env;
@@ -69,8 +67,12 @@ const INTRA_DOC_LINK_EXCEPTIONS: &[(&str, &[&str])] = &[
 
 ];
 
-static BROKEN_INTRA_DOC_LINK: Lazy<Regex> =
-    Lazy::new(|| Regex::new(r#"\[<code>(.*)</code>\]"#).unwrap());
+macro_rules! static_regex {
+    ($re:literal) => {{
+        static RE: ::std::sync::OnceLock<::regex::Regex> = ::std::sync::OnceLock::new();
+        RE.get_or_init(|| ::regex::Regex::new($re).unwrap())
+    }};
+}
 
 macro_rules! t {
     ($e:expr) => {
@@ -373,7 +375,7 @@ impl Checker {
         // Search for intra-doc links that rustdoc didn't warn about
         // NOTE: only looks at one line at a time; in practice this should find most links
         for (i, line) in source.lines().enumerate() {
-            for broken_link in BROKEN_INTRA_DOC_LINK.captures_iter(line) {
+            for broken_link in static_regex!(r#"\[<code>(.*)</code>\]"#).captures_iter(line) {
                 if is_intra_doc_exception(file, &broken_link[1]) {
                     report.intra_doc_exceptions += 1;
                 } else {

src/tools/miri/Cargo.toml

@@ -46,7 +46,6 @@ colored = "2"
 ui_test = "0.21.1"
 rustc_version = "0.4"
 regex = "1.5.5"
-lazy_static = "1.4.0"
 tempfile = "3"
 
 [package.metadata.rust-analyzer]

src/tools/miri/tests/ui.rs

@@ -1,6 +1,7 @@
 use std::ffi::OsString;
 use std::num::NonZeroUsize;
 use std::path::{Path, PathBuf};
+use std::sync::OnceLock;
 use std::{env, process::Command};
 
 use colored::*;
@@ -67,8 +68,8 @@ fn miri_config(target: &str, path: &str, mode: Mode, with_dependencies: bool) ->
 
     let mut config = Config {
         target: Some(target.to_owned()),
-        stderr_filters: STDERR.clone(),
-        stdout_filters: STDOUT.clone(),
+        stderr_filters: stderr_filters().into(),
+        stdout_filters: stdout_filters().into(),
         mode,
         program,
         out_dir: PathBuf::from(std::env::var_os("CARGO_TARGET_DIR").unwrap()).join("ui"),
@@ -174,15 +175,18 @@ fn run_tests(
 }
 
 macro_rules! regexes {
-    ($name:ident: $($regex:expr => $replacement:expr,)*) => {lazy_static::lazy_static! {
-        static ref $name: Vec<(Match, &'static [u8])> = vec![
-            $((Regex::new($regex).unwrap().into(), $replacement.as_bytes()),)*
-        ];
-    }};
+    ($name:ident: $($regex:expr => $replacement:expr,)*) => {
+        fn $name() -> &'static [(Match, &'static [u8])] {
+            static S: OnceLock<Vec<(Match, &'static [u8])>> = OnceLock::new();
+            S.get_or_init(|| vec![
+                $((Regex::new($regex).unwrap().into(), $replacement.as_bytes()),)*
+            ])
+        }
+    };
 }
 
 regexes! {
-    STDOUT:
+    stdout_filters:
     // Windows file paths
     r"\\"                           => "/",
     // erase borrow tags
@@ -191,7 +195,7 @@ regexes! {
 }
 
 regexes! {
-    STDERR:
+    stderr_filters:
     // erase line and column info
     r"\.rs:[0-9]+:[0-9]+(: [0-9]+:[0-9]+)?" => ".rs:LL:CC",
     // erase alloc ids

src/tools/rustfmt/Cargo.toml

@@ -44,7 +44,6 @@ dirs = "4.0"
 getopts = "0.2"
 ignore = "0.4"
 itertools = "0.11"
-lazy_static = "1.4"
 regex = "1.7"
 serde = { version = "1.0.160", features = ["derive"] }
 serde_json = "1.0"

src/tools/rustfmt/src/comment.rs

@@ -3,8 +3,6 @@
 use std::{borrow::Cow, iter};
 
 use itertools::{multipeek, MultiPeek};
-use lazy_static::lazy_static;
-use regex::Regex;
 use rustc_span::Span;
 
 use crate::config::Config;
@@ -17,17 +15,6 @@ use crate::utils::{
 };
 use crate::{ErrorKind, FormattingError};
 
-lazy_static! {
-    /// A regex matching reference doc links.
-    ///
-    /// ```markdown
-    /// /// An [example].
-    /// ///
-    /// /// [example]: this::is::a::link
-    /// ```
-    static ref REFERENCE_LINK_URL: Regex = Regex::new(r"^\[.+\]\s?:").unwrap();
-}
-
 fn is_custom_comment(comment: &str) -> bool {
     if !comment.starts_with("//") {
         false
@@ -980,11 +967,16 @@ fn trim_custom_comment_prefix(s: &str) -> String {
 /// Returns `true` if the given string MAY include URLs or alike.
 fn has_url(s: &str) -> bool {
     // This function may return false positive, but should get its job done in most cases.
+    // The regex is indended to capture text such as the below.
+    //
+    // /// An [example].
+    // ///
+    // /// [example]: this::is::a::link
     s.contains("https://")
         || s.contains("http://")
         || s.contains("ftp://")
         || s.contains("file://")
-        || REFERENCE_LINK_URL.is_match(s)
+        || static_regex!(r"^\[.+\]\s?:").is_match(s)
 }
 
 /// Returns true if the given string may be part of a Markdown table.