Adding upstream version 110.0.1.upstream/110.0.1upstream

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

1 files changed, 742 insertions, 0 deletions

diff --git a/third_party/rust/toml/src/tokens.rs b/third_party/rust/toml/src/tokens.rs
new file mode 100644
index 0000000000..ea1e7ebd83
--- /dev/null
+++ b/third_party/rust/toml/src/tokens.rs
@@ -0,0 +1,742 @@
+use std::borrow::Cow;
+use std::char;
+use std::str;
+use std::string;
+use std::string::String as StdString;
+
+use self::Token::*;
+
+/// A span, designating a range of bytes where a token is located.
+#[derive(Eq, PartialEq, Debug, Clone, Copy)]
+pub struct Span {
+    /// The start of the range.
+    pub start: usize,
+    /// The end of the range (exclusive).
+    pub end: usize,
+}
+
+impl From<Span> for (usize, usize) {
+    fn from(Span { start, end }: Span) -> (usize, usize) {
+        (start, end)
+    }
+}
+
+#[derive(Eq, PartialEq, Debug)]
+pub enum Token<'a> {
+    Whitespace(&'a str),
+    Newline,
+    Comment(&'a str),
+
+    Equals,
+    Period,
+    Comma,
+    Colon,
+    Plus,
+    LeftBrace,
+    RightBrace,
+    LeftBracket,
+    RightBracket,
+
+    Keylike(&'a str),
+    String {
+        src: &'a str,
+        val: Cow<'a, str>,
+        multiline: bool,
+    },
+}
+
+#[derive(Eq, PartialEq, Debug)]
+pub enum Error {
+    InvalidCharInString(usize, char),
+    InvalidEscape(usize, char),
+    InvalidHexEscape(usize, char),
+    InvalidEscapeValue(usize, u32),
+    NewlineInString(usize),
+    Unexpected(usize, char),
+    UnterminatedString(usize),
+    NewlineInTableKey(usize),
+    MultilineStringKey(usize),
+    Wanted {
+        at: usize,
+        expected: &'static str,
+        found: &'static str,
+    },
+}
+
+#[derive(Clone)]
+pub struct Tokenizer<'a> {
+    input: &'a str,
+    chars: CrlfFold<'a>,
+}
+
+#[derive(Clone)]
+struct CrlfFold<'a> {
+    chars: str::CharIndices<'a>,
+}
+
+#[derive(Debug)]
+enum MaybeString {
+    NotEscaped(usize),
+    Owned(string::String),
+}
+
+impl<'a> Tokenizer<'a> {
+    pub fn new(input: &'a str) -> Tokenizer<'a> {
+        let mut t = Tokenizer {
+            input,
+            chars: CrlfFold {
+                chars: input.char_indices(),
+            },
+        };
+        // Eat utf-8 BOM
+        t.eatc('\u{feff}');
+        t
+    }
+
+    pub fn next(&mut self) -> Result<Option<(Span, Token<'a>)>, Error> {
+        let (start, token) = match self.one() {
+            Some((start, '\n')) => (start, Newline),
+            Some((start, ' ')) => (start, self.whitespace_token(start)),
+            Some((start, '\t')) => (start, self.whitespace_token(start)),
+            Some((start, '#')) => (start, self.comment_token(start)),
+            Some((start, '=')) => (start, Equals),
+            Some((start, '.')) => (start, Period),
+            Some((start, ',')) => (start, Comma),
+            Some((start, ':')) => (start, Colon),
+            Some((start, '+')) => (start, Plus),
+            Some((start, '{')) => (start, LeftBrace),
+            Some((start, '}')) => (start, RightBrace),
+            Some((start, '[')) => (start, LeftBracket),
+            Some((start, ']')) => (start, RightBracket),
+            Some((start, '\'')) => {
+                return self
+                    .literal_string(start)
+                    .map(|t| Some((self.step_span(start), t)))
+            }
+            Some((start, '"')) => {
+                return self
+                    .basic_string(start)
+                    .map(|t| Some((self.step_span(start), t)))
+            }
+            Some((start, ch)) if is_keylike(ch) => (start, self.keylike(start)),
+
+            Some((start, ch)) => return Err(Error::Unexpected(start, ch)),
+            None => return Ok(None),
+        };
+
+        let span = self.step_span(start);
+        Ok(Some((span, token)))
+    }
+
+    pub fn peek(&mut self) -> Result<Option<(Span, Token<'a>)>, Error> {
+        self.clone().next()
+    }
+
+    pub fn eat(&mut self, expected: Token<'a>) -> Result<bool, Error> {
+        self.eat_spanned(expected).map(|s| s.is_some())
+    }
+
+    /// Eat a value, returning it's span if it was consumed.
+    pub fn eat_spanned(&mut self, expected: Token<'a>) -> Result<Option<Span>, Error> {
+        let span = match self.peek()? {
+            Some((span, ref found)) if expected == *found => span,
+            Some(_) => return Ok(None),
+            None => return Ok(None),
+        };
+
+        drop(self.next());
+        Ok(Some(span))
+    }
+
+    pub fn expect(&mut self, expected: Token<'a>) -> Result<(), Error> {
+        // ignore span
+        let _ = self.expect_spanned(expected)?;
+        Ok(())
+    }
+
+    /// Expect the given token returning its span.
+    pub fn expect_spanned(&mut self, expected: Token<'a>) -> Result<Span, Error> {
+        let current = self.current();
+        match self.next()? {
+            Some((span, found)) => {
+                if expected == found {
+                    Ok(span)
+                } else {
+                    Err(Error::Wanted {
+                        at: current,
+                        expected: expected.describe(),
+                        found: found.describe(),
+                    })
+                }
+            }
+            None => Err(Error::Wanted {
+                at: self.input.len(),
+                expected: expected.describe(),
+                found: "eof",
+            }),
+        }
+    }
+
+    pub fn table_key(&mut self) -> Result<(Span, Cow<'a, str>), Error> {
+        let current = self.current();
+        match self.next()? {
+            Some((span, Token::Keylike(k))) => Ok((span, k.into())),
+            Some((
+                span,
+                Token::String {
+                    src,
+                    val,
+                    multiline,
+                },
+            )) => {
+                let offset = self.substr_offset(src);
+                if multiline {
+                    return Err(Error::MultilineStringKey(offset));
+                }
+                match src.find('\n') {
+                    None => Ok((span, val)),
+                    Some(i) => Err(Error::NewlineInTableKey(offset + i)),
+                }
+            }
+            Some((_, other)) => Err(Error::Wanted {
+                at: current,
+                expected: "a table key",
+                found: other.describe(),
+            }),
+            None => Err(Error::Wanted {
+                at: self.input.len(),
+                expected: "a table key",
+                found: "eof",
+            }),
+        }
+    }
+
+    pub fn eat_whitespace(&mut self) -> Result<(), Error> {
+        while self.eatc(' ') || self.eatc('\t') {
+            // ...
+        }
+        Ok(())
+    }
+
+    pub fn eat_comment(&mut self) -> Result<bool, Error> {
+        if !self.eatc('#') {
+            return Ok(false);
+        }
+        drop(self.comment_token(0));
+        self.eat_newline_or_eof().map(|()| true)
+    }
+
+    pub fn eat_newline_or_eof(&mut self) -> Result<(), Error> {
+        let current = self.current();
+        match self.next()? {
+            None | Some((_, Token::Newline)) => Ok(()),
+            Some((_, other)) => Err(Error::Wanted {
+                at: current,
+                expected: "newline",
+                found: other.describe(),
+            }),
+        }
+    }
+
+    pub fn skip_to_newline(&mut self) {
+        loop {
+            match self.one() {
+                Some((_, '\n')) | None => break,
+                _ => {}
+            }
+        }
+    }
+
+    fn eatc(&mut self, ch: char) -> bool {
+        match self.chars.clone().next() {
+            Some((_, ch2)) if ch == ch2 => {
+                self.one();
+                true
+            }
+            _ => false,
+        }
+    }
+
+    pub fn current(&mut self) -> usize {
+        self.chars
+            .clone()
+            .next()
+            .map(|i| i.0)
+            .unwrap_or_else(|| self.input.len())
+    }
+
+    pub fn input(&self) -> &'a str {
+        self.input
+    }
+
+    fn whitespace_token(&mut self, start: usize) -> Token<'a> {
+        while self.eatc(' ') || self.eatc('\t') {
+            // ...
+        }
+        Whitespace(&self.input[start..self.current()])
+    }
+
+    fn comment_token(&mut self, start: usize) -> Token<'a> {
+        while let Some((_, ch)) = self.chars.clone().next() {
+            if ch != '\t' && !('\u{20}'..='\u{10ffff}').contains(&ch) {
+                break;
+            }
+            self.one();
+        }
+        Comment(&self.input[start..self.current()])
+    }
+
+    #[allow(clippy::type_complexity)]
+    fn read_string(
+        &mut self,
+        delim: char,
+        start: usize,
+        new_ch: &mut dyn FnMut(
+            &mut Tokenizer<'_>,
+            &mut MaybeString,
+            bool,
+            usize,
+            char,
+        ) -> Result<(), Error>,
+    ) -> Result<Token<'a>, Error> {
+        let mut multiline = false;
+        if self.eatc(delim) {
+            if self.eatc(delim) {
+                multiline = true;
+            } else {
+                return Ok(String {
+                    src: &self.input[start..start + 2],
+                    val: Cow::Borrowed(""),
+                    multiline: false,
+                });
+            }
+        }
+        let mut val = MaybeString::NotEscaped(self.current());
+        let mut n = 0;
+        'outer: loop {
+            n += 1;
+            match self.one() {
+                Some((i, '\n')) => {
+                    if multiline {
+                        if self.input.as_bytes()[i] == b'\r' {
+                            val.to_owned(&self.input[..i]);
+                        }
+                        if n == 1 {
+                            val = MaybeString::NotEscaped(self.current());
+                        } else {
+                            val.push('\n');
+                        }
+                        continue;
+                    } else {
+                        return Err(Error::NewlineInString(i));
+                    }
+                }
+                Some((mut i, ch)) if ch == delim => {
+                    if multiline {
+                        if !self.eatc(delim) {
+                            val.push(delim);
+                            continue 'outer;
+                        }
+                        if !self.eatc(delim) {
+                            val.push(delim);
+                            val.push(delim);
+                            continue 'outer;
+                        }
+                        if self.eatc(delim) {
+                            val.push(delim);
+                            i += 1;
+                        }
+                        if self.eatc(delim) {
+                            val.push(delim);
+                            i += 1;
+                        }
+                    }
+                    return Ok(String {
+                        src: &self.input[start..self.current()],
+                        val: val.into_cow(&self.input[..i]),
+                        multiline,
+                    });
+                }
+                Some((i, c)) => new_ch(self, &mut val, multiline, i, c)?,
+                None => return Err(Error::UnterminatedString(start)),
+            }
+        }
+    }
+
+    fn literal_string(&mut self, start: usize) -> Result<Token<'a>, Error> {
+        self.read_string('\'', start, &mut |_me, val, _multi, i, ch| {
+            if ch == '\u{09}' || (('\u{20}'..='\u{10ffff}').contains(&ch) && ch != '\u{7f}') {
+                val.push(ch);
+                Ok(())
+            } else {
+                Err(Error::InvalidCharInString(i, ch))
+            }
+        })
+    }
+
+    fn basic_string(&mut self, start: usize) -> Result<Token<'a>, Error> {
+        self.read_string('"', start, &mut |me, val, multi, i, ch| match ch {
+            '\\' => {
+                val.to_owned(&me.input[..i]);
+                match me.chars.next() {
+                    Some((_, '"')) => val.push('"'),
+                    Some((_, '\\')) => val.push('\\'),
+                    Some((_, 'b')) => val.push('\u{8}'),
+                    Some((_, 'f')) => val.push('\u{c}'),
+                    Some((_, 'n')) => val.push('\n'),
+                    Some((_, 'r')) => val.push('\r'),
+                    Some((_, 't')) => val.push('\t'),
+                    Some((i, c @ 'u')) | Some((i, c @ 'U')) => {
+                        let len = if c == 'u' { 4 } else { 8 };
+                        val.push(me.hex(start, i, len)?);
+                    }
+                    Some((i, c @ ' ')) | Some((i, c @ '\t')) | Some((i, c @ '\n')) if multi => {
+                        if c != '\n' {
+                            while let Some((_, ch)) = me.chars.clone().next() {
+                                match ch {
+                                    ' ' | '\t' => {
+                                        me.chars.next();
+                                        continue;
+                                    }
+                                    '\n' => {
+                                        me.chars.next();
+                                        break;
+                                    }
+                                    _ => return Err(Error::InvalidEscape(i, c)),
+                                }
+                            }
+                        }
+                        while let Some((_, ch)) = me.chars.clone().next() {
+                            match ch {
+                                ' ' | '\t' | '\n' => {
+                                    me.chars.next();
+                                }
+                                _ => break,
+                            }
+                        }
+                    }
+                    Some((i, c)) => return Err(Error::InvalidEscape(i, c)),
+                    None => return Err(Error::UnterminatedString(start)),
+                }
+                Ok(())
+            }
+            ch if ch == '\u{09}' || (('\u{20}'..='\u{10ffff}').contains(&ch) && ch != '\u{7f}') => {
+                val.push(ch);
+                Ok(())
+            }
+            _ => Err(Error::InvalidCharInString(i, ch)),
+        })
+    }
+
+    fn hex(&mut self, start: usize, i: usize, len: usize) -> Result<char, Error> {
+        let mut buf = StdString::with_capacity(len);
+        for _ in 0..len {
+            match self.one() {
+                Some((_, ch)) if ch as u32 <= 0x7F && ch.is_ascii_hexdigit() => buf.push(ch),
+                Some((i, ch)) => return Err(Error::InvalidHexEscape(i, ch)),
+                None => return Err(Error::UnterminatedString(start)),
+            }
+        }
+        let val = u32::from_str_radix(&buf, 16).unwrap();
+        match char::from_u32(val) {
+            Some(ch) => Ok(ch),
+            None => Err(Error::InvalidEscapeValue(i, val)),
+        }
+    }
+
+    fn keylike(&mut self, start: usize) -> Token<'a> {
+        while let Some((_, ch)) = self.peek_one() {
+            if !is_keylike(ch) {
+                break;
+            }
+            self.one();
+        }
+        Keylike(&self.input[start..self.current()])
+    }
+
+    pub fn substr_offset(&self, s: &'a str) -> usize {
+        assert!(s.len() <= self.input.len());
+        let a = self.input.as_ptr() as usize;
+        let b = s.as_ptr() as usize;
+        assert!(a <= b);
+        b - a
+    }
+
+    /// Calculate the span of a single character.
+    fn step_span(&mut self, start: usize) -> Span {
+        let end = self
+            .peek_one()
+            .map(|t| t.0)
+            .unwrap_or_else(|| self.input.len());
+        Span { start, end }
+    }
+
+    /// Peek one char without consuming it.
+    fn peek_one(&mut self) -> Option<(usize, char)> {
+        self.chars.clone().next()
+    }
+
+    /// Take one char.
+    pub fn one(&mut self) -> Option<(usize, char)> {
+        self.chars.next()
+    }
+}
+
+impl<'a> Iterator for CrlfFold<'a> {
+    type Item = (usize, char);
+
+    fn next(&mut self) -> Option<(usize, char)> {
+        self.chars.next().map(|(i, c)| {
+            if c == '\r' {
+                let mut attempt = self.chars.clone();
+                if let Some((_, '\n')) = attempt.next() {
+                    self.chars = attempt;
+                    return (i, '\n');
+                }
+            }
+            (i, c)
+        })
+    }
+}
+
+impl MaybeString {
+    fn push(&mut self, ch: char) {
+        match *self {
+            MaybeString::NotEscaped(..) => {}
+            MaybeString::Owned(ref mut s) => s.push(ch),
+        }
+    }
+
+    #[allow(clippy::wrong_self_convention)]
+    fn to_owned(&mut self, input: &str) {
+        match *self {
+            MaybeString::NotEscaped(start) => {
+                *self = MaybeString::Owned(input[start..].to_owned());
+            }
+            MaybeString::Owned(..) => {}
+        }
+    }
+
+    fn into_cow(self, input: &str) -> Cow<'_, str> {
+        match self {
+            MaybeString::NotEscaped(start) => Cow::Borrowed(&input[start..]),
+            MaybeString::Owned(s) => Cow::Owned(s),
+        }
+    }
+}
+
+fn is_keylike(ch: char) -> bool {
+    ('A'..='Z').contains(&ch)
+        || ('a'..='z').contains(&ch)
+        || ('0'..='9').contains(&ch)
+        || ch == '-'
+        || ch == '_'
+}
+
+impl<'a> Token<'a> {
+    pub fn describe(&self) -> &'static str {
+        match *self {
+            Token::Keylike(_) => "an identifier",
+            Token::Equals => "an equals",
+            Token::Period => "a period",
+            Token::Comment(_) => "a comment",
+            Token::Newline => "a newline",
+            Token::Whitespace(_) => "whitespace",
+            Token::Comma => "a comma",
+            Token::RightBrace => "a right brace",
+            Token::LeftBrace => "a left brace",
+            Token::RightBracket => "a right bracket",
+            Token::LeftBracket => "a left bracket",
+            Token::String { multiline, .. } => {
+                if multiline {
+                    "a multiline string"
+                } else {
+                    "a string"
+                }
+            }
+            Token::Colon => "a colon",
+            Token::Plus => "a plus",
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::{Error, Token, Tokenizer};
+    use std::borrow::Cow;
+
+    fn err(input: &str, err: Error) {
+        let mut t = Tokenizer::new(input);
+        let token = t.next().unwrap_err();
+        assert_eq!(token, err);
+        assert!(t.next().unwrap().is_none());
+    }
+
+    #[test]
+    fn literal_strings() {
+        fn t(input: &str, val: &str, multiline: bool) {
+            let mut t = Tokenizer::new(input);
+            let (_, token) = t.next().unwrap().unwrap();
+            assert_eq!(
+                token,
+                Token::String {
+                    src: input,
+                    val: Cow::Borrowed(val),
+                    multiline,
+                }
+            );
+            assert!(t.next().unwrap().is_none());
+        }
+
+        t("''", "", false);
+        t("''''''", "", true);
+        t("'''\n'''", "", true);
+        t("'a'", "a", false);
+        t("'\"a'", "\"a", false);
+        t("''''a'''", "'a", true);
+        t("'''\n'a\n'''", "'a\n", true);
+        t("'''a\n'a\r\n'''", "a\n'a\n", true);
+    }
+
+    #[test]
+    fn basic_strings() {
+        fn t(input: &str, val: &str, multiline: bool) {
+            let mut t = Tokenizer::new(input);
+            let (_, token) = t.next().unwrap().unwrap();
+            assert_eq!(
+                token,
+                Token::String {
+                    src: input,
+                    val: Cow::Borrowed(val),
+                    multiline,
+                }
+            );
+            assert!(t.next().unwrap().is_none());
+        }
+
+        t(r#""""#, "", false);
+        t(r#""""""""#, "", true);
+        t(r#""a""#, "a", false);
+        t(r#""""a""""#, "a", true);
+        t(r#""\t""#, "\t", false);
+        t(r#""\u0000""#, "\0", false);
+        t(r#""\U00000000""#, "\0", false);
+        t(r#""\U000A0000""#, "\u{A0000}", false);
+        t(r#""\\t""#, "\\t", false);
+        t("\"\t\"", "\t", false);
+        t("\"\"\"\n\t\"\"\"", "\t", true);
+        t("\"\"\"\\\n\"\"\"", "", true);
+        t(
+            "\"\"\"\\\n     \t   \t  \\\r\n  \t \n  \t \r\n\"\"\"",
+            "",
+            true,
+        );
+        t(r#""\r""#, "\r", false);
+        t(r#""\n""#, "\n", false);
+        t(r#""\b""#, "\u{8}", false);
+        t(r#""a\fa""#, "a\u{c}a", false);
+        t(r#""\"a""#, "\"a", false);
+        t("\"\"\"\na\"\"\"", "a", true);
+        t("\"\"\"\n\"\"\"", "", true);
+        t(r#""""a\"""b""""#, "a\"\"\"b", true);
+        err(r#""\a"#, Error::InvalidEscape(2, 'a'));
+        err("\"\\\n", Error::InvalidEscape(2, '\n'));
+        err("\"\\\r\n", Error::InvalidEscape(2, '\n'));
+        err("\"\\", Error::UnterminatedString(0));
+        err("\"\u{0}", Error::InvalidCharInString(1, '\u{0}'));
+        err(r#""\U00""#, Error::InvalidHexEscape(5, '"'));
+        err(r#""\U00"#, Error::UnterminatedString(0));
+        err(r#""\uD800"#, Error::InvalidEscapeValue(2, 0xd800));
+        err(r#""\UFFFFFFFF"#, Error::InvalidEscapeValue(2, 0xffff_ffff));
+    }
+
+    #[test]
+    fn keylike() {
+        fn t(input: &str) {
+            let mut t = Tokenizer::new(input);
+            let (_, token) = t.next().unwrap().unwrap();
+            assert_eq!(token, Token::Keylike(input));
+            assert!(t.next().unwrap().is_none());
+        }
+        t("foo");
+        t("0bar");
+        t("bar0");
+        t("1234");
+        t("a-b");
+        t("a_B");
+        t("-_-");
+        t("___");
+    }
+
+    #[test]
+    fn all() {
+        fn t(input: &str, expected: &[((usize, usize), Token<'_>, &str)]) {
+            let mut tokens = Tokenizer::new(input);
+            let mut actual: Vec<((usize, usize), Token<'_>, &str)> = Vec::new();
+            while let Some((span, token)) = tokens.next().unwrap() {
+                actual.push((span.into(), token, &input[span.start..span.end]));
+            }
+            for (a, b) in actual.iter().zip(expected) {
+                assert_eq!(a, b);
+            }
+            assert_eq!(actual.len(), expected.len());
+        }
+
+        t(
+            " a ",
+            &[
+                ((0, 1), Token::Whitespace(" "), " "),
+                ((1, 2), Token::Keylike("a"), "a"),
+                ((2, 3), Token::Whitespace(" "), " "),
+            ],
+        );
+
+        t(
+            " a\t [[]] \t [] {} , . =\n# foo \r\n#foo \n ",
+            &[
+                ((0, 1), Token::Whitespace(" "), " "),
+                ((1, 2), Token::Keylike("a"), "a"),
+                ((2, 4), Token::Whitespace("\t "), "\t "),
+                ((4, 5), Token::LeftBracket, "["),
+                ((5, 6), Token::LeftBracket, "["),
+                ((6, 7), Token::RightBracket, "]"),
+                ((7, 8), Token::RightBracket, "]"),
+                ((8, 11), Token::Whitespace(" \t "), " \t "),
+                ((11, 12), Token::LeftBracket, "["),
+                ((12, 13), Token::RightBracket, "]"),
+                ((13, 14), Token::Whitespace(" "), " "),
+                ((14, 15), Token::LeftBrace, "{"),
+                ((15, 16), Token::RightBrace, "}"),
+                ((16, 17), Token::Whitespace(" "), " "),
+                ((17, 18), Token::Comma, ","),
+                ((18, 19), Token::Whitespace(" "), " "),
+                ((19, 20), Token::Period, "."),
+                ((20, 21), Token::Whitespace(" "), " "),
+                ((21, 22), Token::Equals, "="),
+                ((22, 23), Token::Newline, "\n"),
+                ((23, 29), Token::Comment("# foo "), "# foo "),
+                ((29, 31), Token::Newline, "\r\n"),
+                ((31, 36), Token::Comment("#foo "), "#foo "),
+                ((36, 37), Token::Newline, "\n"),
+                ((37, 38), Token::Whitespace(" "), " "),
+            ],
+        );
+    }
+
+    #[test]
+    fn bare_cr_bad() {
+        err("\r", Error::Unexpected(0, '\r'));
+        err("'\n", Error::NewlineInString(1));
+        err("'\u{0}", Error::InvalidCharInString(1, '\u{0}'));
+        err("'", Error::UnterminatedString(0));
+        err("\u{0}", Error::Unexpected(0, '\u{0}'));
+    }
+
+    #[test]
+    fn bad_comment() {
+        let mut t = Tokenizer::new("#\u{0}");
+        t.next().unwrap().unwrap();
+        assert_eq!(t.next(), Err(Error::Unexpected(1, '\u{0}')));
+        assert!(t.next().unwrap().is_none());
+    }
+}