Adding upstream version 86.0.1.upstream/86.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 313 insertions, 0 deletions

diff --git a/third_party/rust/phf_codegen/src/lib.rs b/third_party/rust/phf_codegen/src/lib.rs
new file mode 100644
index 0000000000..2f3c428a5b
--- /dev/null
+++ b/third_party/rust/phf_codegen/src/lib.rs
@@ -0,0 +1,313 @@
+//! A set of builders to generate Rust source for PHF data structures at
+//! compile time.
+//!
+//! The provided builders are intended to be used in a Cargo build script to
+//! generate a Rust source file that will be included in a library at build
+//! time.
+//!
+//! # Examples
+//!
+//! build.rs
+//!
+//! ```rust,no_run
+//! extern crate phf_codegen;
+//!
+//! use std::env;
+//! use std::fs::File;
+//! use std::io::{BufWriter, Write};
+//! use std::path::Path;
+//!
+//! fn main() {
+//!     let path = Path::new(&env::var("OUT_DIR").unwrap()).join("codegen.rs");
+//!     let mut file = BufWriter::new(File::create(&path).unwrap());
+//!
+//!     writeln!(
+//!         &mut file,
+//!          "static KEYWORDS: phf::Map<&'static str, Keyword> = \n{};\n",
+//!          phf_codegen::Map::new()
+//!              .entry("loop", "Keyword::Loop")
+//!              .entry("continue", "Keyword::Continue")
+//!              .entry("break", "Keyword::Break")
+//!              .entry("fn", "Keyword::Fn")
+//!              .entry("extern", "Keyword::Extern")
+//!              .build()
+//!     ).unwrap();
+//! }
+//! ```
+//!
+//! lib.rs
+//!
+//! ```ignore
+//! extern crate phf;
+//!
+//! #[derive(Clone)]
+//! enum Keyword {
+//!     Loop,
+//!     Continue,
+//!     Break,
+//!     Fn,
+//!     Extern,
+//! }
+//!
+//! include!(concat!(env!("OUT_DIR"), "/codegen.rs"));
+//!
+//! pub fn parse_keyword(keyword: &str) -> Option<Keyword> {
+//!     KEYWORDS.get(keyword).cloned()
+//! }
+//! ```
+//!
+//! ##### Byte-String Keys
+//! Byte strings by default produce references to fixed-size arrays; the compiler needs a hint
+//! to coerce them to slices:
+//!
+//! build.rs
+//!
+//! ```rust,no_run
+//! extern crate phf_codegen;
+//!
+//! use std::env;
+//! use std::fs::File;
+//! use std::io::{BufWriter, Write};
+//! use std::path::Path;
+//!
+//! fn main() {
+//!     let path = Path::new(&env::var("OUT_DIR").unwrap()).join("codegen.rs");
+//!     let mut file = BufWriter::new(File::create(&path).unwrap());
+//!
+//!     writeln!(
+//!         &mut file,
+//!          "static KEYWORDS: phf::Map<&'static [u8], Keyword> = \n{};\n",
+//!          phf_codegen::Map::<&[u8]>::new()
+//!              .entry(b"loop", "Keyword::Loop")
+//!              .entry(b"continue", "Keyword::Continue")
+//!              .entry(b"break", "Keyword::Break")
+//!              .entry(b"fn", "Keyword::Fn")
+//!              .entry(b"extern", "Keyword::Extern")
+//!              .build()
+//!     ).unwrap();
+//! }
+//! ```
+//!
+//! lib.rs
+//!
+//! ```rust,ignore
+//! extern crate phf;
+//!
+//! #[derive(Clone)]
+//! enum Keyword {
+//!     Loop,
+//!     Continue,
+//!     Break,
+//!     Fn,
+//!     Extern,
+//! }
+//!
+//! include!(concat!(env!("OUT_DIR"), "/codegen.rs"));
+//!
+//! pub fn parse_keyword(keyword: &[u8]) -> Option<Keyword> {
+//!     KEYWORDS.get(keyword).cloned()
+//! }
+//! ```
+//!
+//! # Note
+//!
+//! The compiler's stack will overflow when processing extremely long method
+//! chains (500+ calls). When generating large PHF data structures, consider
+//! looping over the entries or making each call a separate statement:
+//!
+//! ```rust
+//! let entries = [("hello", "1"), ("world", "2")];
+//!
+//! let mut builder = phf_codegen::Map::new();
+//! for &(key, value) in &entries {
+//!     builder.entry(key, value);
+//! }
+//! // ...
+//! ```
+//!
+//! ```rust
+//! let mut builder = phf_codegen::Map::new();
+//! builder.entry("hello", "1");
+//! builder.entry("world", "2");
+//! // ...
+//! ```
+#![doc(html_root_url = "https://docs.rs/phf_codegen/0.7")]
+
+use phf_shared::{PhfHash, FmtConst};
+use std::collections::HashSet;
+use std::fmt;
+use std::hash::Hash;
+
+use phf_generator::HashState;
+
+struct Delegate<T>(T);
+
+impl<T: FmtConst> fmt::Display for Delegate<T> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        self.0.fmt_const(f)
+    }
+}
+
+/// A builder for the `phf::Map` type.
+pub struct Map<K> {
+    keys: Vec<K>,
+    values: Vec<String>,
+    path: String,
+}
+
+impl<K: Hash + PhfHash + Eq + FmtConst> Map<K> {
+    /// Creates a new `phf::Map` builder.
+    pub fn new() -> Map<K> {
+        // FIXME rust#27438
+        //
+        // On Windows/MSVC there are major problems with the handling of dllimport.
+        // Here, because downstream build scripts only invoke generics from phf_codegen,
+        // the linker ends up throwing a way a bunch of static symbols we actually need.
+        // This works around the problem, assuming that all clients call `Map::new` by
+        // calling a non-generic function.
+        fn noop_fix_for_27438() {}
+        noop_fix_for_27438();
+
+        Map {
+            keys: vec![],
+            values: vec![],
+            path: String::from("::phf"),
+        }
+    }
+
+    /// Set the path to the `phf` crate from the global namespace
+    pub fn phf_path(&mut self, path: &str) -> &mut Map<K> {
+        self.path = path.to_owned();
+        self
+    }
+
+    /// Adds an entry to the builder.
+    ///
+    /// `value` will be written exactly as provided in the constructed source.
+    pub fn entry(&mut self, key: K, value: &str) -> &mut Map<K> {
+        self.keys.push(key);
+        self.values.push(value.to_owned());
+        self
+    }
+
+    /// Calculate the hash parameters and return a struct implementing
+    /// [`Display`](::std::fmt::Display) which will print the constructed `phf::Map`.
+    ///
+    /// # Panics
+    ///
+    /// Panics if there are any duplicate keys.
+    pub fn build(&self) -> DisplayMap<K> {
+        let mut set = HashSet::new();
+        for key in &self.keys {
+            if !set.insert(key) {
+                panic!("duplicate key `{}`", Delegate(key));
+            }
+        }
+
+        let state = phf_generator::generate_hash(&self.keys);
+
+        DisplayMap {
+            path: &self.path,
+            keys: &self.keys,
+            values: &self.values,
+            state,
+        }
+    }
+}
+
+/// An adapter for printing a [`Map`](Map).
+pub struct DisplayMap<'a, K> {
+    path: &'a str,
+    state: HashState,
+    keys: &'a [K],
+    values: &'a [String],
+
+}
+
+impl<'a, K: FmtConst + 'a> fmt::Display for DisplayMap<'a, K> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        // funky formatting here for nice output
+        write!(f,
+               "{}::Map {{
+    key: {:?},
+    disps: {}::Slice::Static(&[",
+               self.path, self.state.key, self.path)?;
+
+        // write map displacements
+        for &(d1, d2) in &self.state.disps {
+            write!(f,
+                   "
+        ({}, {}),",
+                   d1,
+                   d2)?;
+        }
+
+        write!(f,
+               "
+    ]),
+    entries: {}::Slice::Static(&[", self.path)?;
+
+        // write map entries
+        for &idx in &self.state.map {
+            write!(f,
+                   "
+        ({}, {}),",
+                   Delegate(&self.keys[idx]),
+                   &self.values[idx])?;
+        }
+
+        write!(f,
+               "
+    ]),
+}}")
+    }
+}
+
+/// A builder for the `phf::Set` type.
+pub struct Set<T> {
+    map: Map<T>,
+}
+
+impl<T: Hash + PhfHash + Eq + FmtConst> Set<T> {
+    /// Constructs a new `phf::Set` builder.
+    pub fn new() -> Set<T> {
+        Set {
+            map: Map::new(),
+        }
+    }
+
+    /// Set the path to the `phf` crate from the global namespace
+    pub fn phf_path(&mut self, path: &str) -> &mut Set<T> {
+        self.map.phf_path(path);
+        self
+    }
+
+    /// Adds an entry to the builder.
+    pub fn entry(&mut self, entry: T) -> &mut Set<T> {
+        self.map.entry(entry, "()");
+        self
+    }
+
+    /// Calculate the hash parameters and return a struct implementing
+    /// [`Display`](::std::fmt::Display) which will print the constructed `phf::Set`.
+    ///
+    /// # Panics
+    ///
+    /// Panics if there are any duplicate keys.
+    pub fn build(&self) -> DisplaySet<T> {
+        DisplaySet {
+            inner: self.map.build()
+        }
+    }
+}
+
+/// An adapter for printing a [`Set`](Set).
+pub struct DisplaySet<'a, T: 'a> {
+    inner: DisplayMap<'a, T>,
+}
+
+impl<'a, T: FmtConst + 'a> fmt::Display for DisplaySet<'a, T> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{}::Set {{ map: {} }}", self.inner.path, self.inner)
+    }
+}