Adding upstream version 115.8.0esr.upstream/115.8.0esr

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

1 files changed, 319 insertions, 0 deletions

diff --git a/third_party/rust/cargo-platform/src/cfg.rs b/third_party/rust/cargo-platform/src/cfg.rs
new file mode 100644
index 0000000000..c3ddb69bc8
--- /dev/null
+++ b/third_party/rust/cargo-platform/src/cfg.rs
@@ -0,0 +1,319 @@
+use crate::error::{ParseError, ParseErrorKind::*};
+use std::fmt;
+use std::iter;
+use std::str::{self, FromStr};
+
+/// A cfg expression.
+#[derive(Eq, PartialEq, Hash, Ord, PartialOrd, Clone, Debug)]
+pub enum CfgExpr {
+    Not(Box<CfgExpr>),
+    All(Vec<CfgExpr>),
+    Any(Vec<CfgExpr>),
+    Value(Cfg),
+}
+
+/// A cfg value.
+#[derive(Eq, PartialEq, Hash, Ord, PartialOrd, Clone, Debug)]
+pub enum Cfg {
+    /// A named cfg value, like `unix`.
+    Name(String),
+    /// A key/value cfg pair, like `target_os = "linux"`.
+    KeyPair(String, String),
+}
+
+#[derive(PartialEq)]
+enum Token<'a> {
+    LeftParen,
+    RightParen,
+    Ident(&'a str),
+    Comma,
+    Equals,
+    String(&'a str),
+}
+
+#[derive(Clone)]
+struct Tokenizer<'a> {
+    s: iter::Peekable<str::CharIndices<'a>>,
+    orig: &'a str,
+}
+
+struct Parser<'a> {
+    t: Tokenizer<'a>,
+}
+
+impl FromStr for Cfg {
+    type Err = ParseError;
+
+    fn from_str(s: &str) -> Result<Cfg, Self::Err> {
+        let mut p = Parser::new(s);
+        let e = p.cfg()?;
+        if let Some(rest) = p.rest() {
+            return Err(ParseError::new(
+                p.t.orig,
+                UnterminatedExpression(rest.to_string()),
+            ));
+        }
+        Ok(e)
+    }
+}
+
+impl fmt::Display for Cfg {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match *self {
+            Cfg::Name(ref s) => s.fmt(f),
+            Cfg::KeyPair(ref k, ref v) => write!(f, "{} = \"{}\"", k, v),
+        }
+    }
+}
+
+impl CfgExpr {
+    /// Utility function to check if the key, "cfg(..)" matches the `target_cfg`
+    pub fn matches_key(key: &str, target_cfg: &[Cfg]) -> bool {
+        if key.starts_with("cfg(") && key.ends_with(')') {
+            let cfg = &key[4..key.len() - 1];
+
+            CfgExpr::from_str(cfg)
+                .ok()
+                .map(|ce| ce.matches(target_cfg))
+                .unwrap_or(false)
+        } else {
+            false
+        }
+    }
+
+    pub fn matches(&self, cfg: &[Cfg]) -> bool {
+        match *self {
+            CfgExpr::Not(ref e) => !e.matches(cfg),
+            CfgExpr::All(ref e) => e.iter().all(|e| e.matches(cfg)),
+            CfgExpr::Any(ref e) => e.iter().any(|e| e.matches(cfg)),
+            CfgExpr::Value(ref e) => cfg.contains(e),
+        }
+    }
+}
+
+impl FromStr for CfgExpr {
+    type Err = ParseError;
+
+    fn from_str(s: &str) -> Result<CfgExpr, Self::Err> {
+        let mut p = Parser::new(s);
+        let e = p.expr()?;
+        if let Some(rest) = p.rest() {
+            return Err(ParseError::new(
+                p.t.orig,
+                UnterminatedExpression(rest.to_string()),
+            ));
+        }
+        Ok(e)
+    }
+}
+
+impl fmt::Display for CfgExpr {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match *self {
+            CfgExpr::Not(ref e) => write!(f, "not({})", e),
+            CfgExpr::All(ref e) => write!(f, "all({})", CommaSep(e)),
+            CfgExpr::Any(ref e) => write!(f, "any({})", CommaSep(e)),
+            CfgExpr::Value(ref e) => write!(f, "{}", e),
+        }
+    }
+}
+
+struct CommaSep<'a, T>(&'a [T]);
+
+impl<'a, T: fmt::Display> fmt::Display for CommaSep<'a, T> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        for (i, v) in self.0.iter().enumerate() {
+            if i > 0 {
+                write!(f, ", ")?;
+            }
+            write!(f, "{}", v)?;
+        }
+        Ok(())
+    }
+}
+
+impl<'a> Parser<'a> {
+    fn new(s: &'a str) -> Parser<'a> {
+        Parser {
+            t: Tokenizer {
+                s: s.char_indices().peekable(),
+                orig: s,
+            },
+        }
+    }
+
+    fn expr(&mut self) -> Result<CfgExpr, ParseError> {
+        match self.peek() {
+            Some(Ok(Token::Ident(op @ "all"))) | Some(Ok(Token::Ident(op @ "any"))) => {
+                self.t.next();
+                let mut e = Vec::new();
+                self.eat(&Token::LeftParen)?;
+                while !self.r#try(&Token::RightParen) {
+                    e.push(self.expr()?);
+                    if !self.r#try(&Token::Comma) {
+                        self.eat(&Token::RightParen)?;
+                        break;
+                    }
+                }
+                if op == "all" {
+                    Ok(CfgExpr::All(e))
+                } else {
+                    Ok(CfgExpr::Any(e))
+                }
+            }
+            Some(Ok(Token::Ident("not"))) => {
+                self.t.next();
+                self.eat(&Token::LeftParen)?;
+                let e = self.expr()?;
+                self.eat(&Token::RightParen)?;
+                Ok(CfgExpr::Not(Box::new(e)))
+            }
+            Some(Ok(..)) => self.cfg().map(CfgExpr::Value),
+            Some(Err(..)) => Err(self.t.next().unwrap().err().unwrap()),
+            None => Err(ParseError::new(
+                self.t.orig,
+                IncompleteExpr("start of a cfg expression"),
+            )),
+        }
+    }
+
+    fn cfg(&mut self) -> Result<Cfg, ParseError> {
+        match self.t.next() {
+            Some(Ok(Token::Ident(name))) => {
+                let e = if self.r#try(&Token::Equals) {
+                    let val = match self.t.next() {
+                        Some(Ok(Token::String(s))) => s,
+                        Some(Ok(t)) => {
+                            return Err(ParseError::new(
+                                self.t.orig,
+                                UnexpectedToken {
+                                    expected: "a string",
+                                    found: t.classify(),
+                                },
+                            ))
+                        }
+                        Some(Err(e)) => return Err(e),
+                        None => {
+                            return Err(ParseError::new(self.t.orig, IncompleteExpr("a string")))
+                        }
+                    };
+                    Cfg::KeyPair(name.to_string(), val.to_string())
+                } else {
+                    Cfg::Name(name.to_string())
+                };
+                Ok(e)
+            }
+            Some(Ok(t)) => Err(ParseError::new(
+                self.t.orig,
+                UnexpectedToken {
+                    expected: "identifier",
+                    found: t.classify(),
+                },
+            )),
+            Some(Err(e)) => Err(e),
+            None => Err(ParseError::new(self.t.orig, IncompleteExpr("identifier"))),
+        }
+    }
+
+    fn peek(&mut self) -> Option<Result<Token<'a>, ParseError>> {
+        self.t.clone().next()
+    }
+
+    fn r#try(&mut self, token: &Token<'a>) -> bool {
+        match self.peek() {
+            Some(Ok(ref t)) if token == t => {}
+            _ => return false,
+        }
+        self.t.next();
+        true
+    }
+
+    fn eat(&mut self, token: &Token<'a>) -> Result<(), ParseError> {
+        match self.t.next() {
+            Some(Ok(ref t)) if token == t => Ok(()),
+            Some(Ok(t)) => Err(ParseError::new(
+                self.t.orig,
+                UnexpectedToken {
+                    expected: token.classify(),
+                    found: t.classify(),
+                },
+            )),
+            Some(Err(e)) => Err(e),
+            None => Err(ParseError::new(
+                self.t.orig,
+                IncompleteExpr(token.classify()),
+            )),
+        }
+    }
+
+    /// Returns the rest of the input from the current location.
+    fn rest(&self) -> Option<&str> {
+        let mut s = self.t.s.clone();
+        loop {
+            match s.next() {
+                Some((_, ' ')) => {}
+                Some((start, _ch)) => return Some(&self.t.orig[start..]),
+                None => return None,
+            }
+        }
+    }
+}
+
+impl<'a> Iterator for Tokenizer<'a> {
+    type Item = Result<Token<'a>, ParseError>;
+
+    fn next(&mut self) -> Option<Result<Token<'a>, ParseError>> {
+        loop {
+            match self.s.next() {
+                Some((_, ' ')) => {}
+                Some((_, '(')) => return Some(Ok(Token::LeftParen)),
+                Some((_, ')')) => return Some(Ok(Token::RightParen)),
+                Some((_, ',')) => return Some(Ok(Token::Comma)),
+                Some((_, '=')) => return Some(Ok(Token::Equals)),
+                Some((start, '"')) => {
+                    while let Some((end, ch)) = self.s.next() {
+                        if ch == '"' {
+                            return Some(Ok(Token::String(&self.orig[start + 1..end])));
+                        }
+                    }
+                    return Some(Err(ParseError::new(self.orig, UnterminatedString)));
+                }
+                Some((start, ch)) if is_ident_start(ch) => {
+                    while let Some(&(end, ch)) = self.s.peek() {
+                        if !is_ident_rest(ch) {
+                            return Some(Ok(Token::Ident(&self.orig[start..end])));
+                        } else {
+                            self.s.next();
+                        }
+                    }
+                    return Some(Ok(Token::Ident(&self.orig[start..])));
+                }
+                Some((_, ch)) => {
+                    return Some(Err(ParseError::new(self.orig, UnexpectedChar(ch))));
+                }
+                None => return None,
+            }
+        }
+    }
+}
+
+fn is_ident_start(ch: char) -> bool {
+    ch == '_' || ch.is_ascii_alphabetic()
+}
+
+fn is_ident_rest(ch: char) -> bool {
+    is_ident_start(ch) || ch.is_ascii_digit()
+}
+
+impl<'a> Token<'a> {
+    fn classify(&self) -> &'static str {
+        match *self {
+            Token::LeftParen => "`(`",
+            Token::RightParen => "`)`",
+            Token::Ident(..) => "an identifier",
+            Token::Comma => "`,`",
+            Token::Equals => "`=`",
+            Token::String(..) => "a string",
+        }
+    }
+}