Adding upstream version 115.8.0esr.upstream/115.8.0esr

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

1 files changed, 1434 insertions, 0 deletions

diff --git a/third_party/rust/glob/src/lib.rs b/third_party/rust/glob/src/lib.rs
new file mode 100644
index 0000000000..744cabf380
--- /dev/null
+++ b/third_party/rust/glob/src/lib.rs
@@ -0,0 +1,1434 @@
+// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! Support for matching file paths against Unix shell style patterns.
+//!
+//! The `glob` and `glob_with` functions allow querying the filesystem for all
+//! files that match a particular pattern (similar to the libc `glob` function).
+//! The methods on the `Pattern` type provide functionality for checking if
+//! individual paths match a particular pattern (similar to the libc `fnmatch`
+//! function).
+//!
+//! For consistency across platforms, and for Windows support, this module
+//! is implemented entirely in Rust rather than deferring to the libc
+//! `glob`/`fnmatch` functions.
+//!
+//! # Examples
+//!
+//! To print all jpg files in `/media/` and all of its subdirectories.
+//!
+//! ```rust,no_run
+//! use glob::glob;
+//!
+//! for entry in glob("/media/**/*.jpg").expect("Failed to read glob pattern") {
+//!     match entry {
+//!         Ok(path) => println!("{:?}", path.display()),
+//!         Err(e) => println!("{:?}", e),
+//!     }
+//! }
+//! ```
+//!
+//! To print all files containing the letter "a", case insensitive, in a `local`
+//! directory relative to the current working directory. This ignores errors
+//! instead of printing them.
+//!
+//! ```rust,no_run
+//! use glob::glob_with;
+//! use glob::MatchOptions;
+//!
+//! let options = MatchOptions {
+//!     case_sensitive: false,
+//!     require_literal_separator: false,
+//!     require_literal_leading_dot: false,
+//! };
+//! for entry in glob_with("local/*a*", options).unwrap() {
+//!     if let Ok(path) = entry {
+//!         println!("{:?}", path.display())
+//!     }
+//! }
+//! ```
+
+#![doc(
+    html_logo_url = "https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
+    html_favicon_url = "https://www.rust-lang.org/favicon.ico",
+    html_root_url = "https://docs.rs/glob/0.3.1"
+)]
+#![deny(missing_docs)]
+
+#[cfg(test)]
+#[macro_use]
+extern crate doc_comment;
+
+#[cfg(test)]
+doctest!("../README.md");
+
+use std::cmp;
+use std::error::Error;
+use std::fmt;
+use std::fs;
+use std::io;
+use std::path::{self, Component, Path, PathBuf};
+use std::str::FromStr;
+
+use CharSpecifier::{CharRange, SingleChar};
+use MatchResult::{EntirePatternDoesntMatch, Match, SubPatternDoesntMatch};
+use PatternToken::AnyExcept;
+use PatternToken::{AnyChar, AnyRecursiveSequence, AnySequence, AnyWithin, Char};
+
+/// An iterator that yields `Path`s from the filesystem that match a particular
+/// pattern.
+///
+/// Note that it yields `GlobResult` in order to report any `IoErrors` that may
+/// arise during iteration. If a directory matches but is unreadable,
+/// thereby preventing its contents from being checked for matches, a
+/// `GlobError` is returned to express this.
+///
+/// See the `glob` function for more details.
+#[derive(Debug)]
+pub struct Paths {
+    dir_patterns: Vec<Pattern>,
+    require_dir: bool,
+    options: MatchOptions,
+    todo: Vec<Result<(PathBuf, usize), GlobError>>,
+    scope: Option<PathBuf>,
+}
+
+/// Return an iterator that produces all the `Path`s that match the given
+/// pattern using default match options, which may be absolute or relative to
+/// the current working directory.
+///
+/// This may return an error if the pattern is invalid.
+///
+/// This method uses the default match options and is equivalent to calling
+/// `glob_with(pattern, MatchOptions::new())`. Use `glob_with` directly if you
+/// want to use non-default match options.
+///
+/// When iterating, each result is a `GlobResult` which expresses the
+/// possibility that there was an `IoError` when attempting to read the contents
+/// of the matched path.  In other words, each item returned by the iterator
+/// will either be an `Ok(Path)` if the path matched, or an `Err(GlobError)` if
+/// the path (partially) matched _but_ its contents could not be read in order
+/// to determine if its contents matched.
+///
+/// See the `Paths` documentation for more information.
+///
+/// # Examples
+///
+/// Consider a directory `/media/pictures` containing only the files
+/// `kittens.jpg`, `puppies.jpg` and `hamsters.gif`:
+///
+/// ```rust,no_run
+/// use glob::glob;
+///
+/// for entry in glob("/media/pictures/*.jpg").unwrap() {
+///     match entry {
+///         Ok(path) => println!("{:?}", path.display()),
+///
+///         // if the path matched but was unreadable,
+///         // thereby preventing its contents from matching
+///         Err(e) => println!("{:?}", e),
+///     }
+/// }
+/// ```
+///
+/// The above code will print:
+///
+/// ```ignore
+/// /media/pictures/kittens.jpg
+/// /media/pictures/puppies.jpg
+/// ```
+///
+/// If you want to ignore unreadable paths, you can use something like
+/// `filter_map`:
+///
+/// ```rust
+/// use glob::glob;
+/// use std::result::Result;
+///
+/// for path in glob("/media/pictures/*.jpg").unwrap().filter_map(Result::ok) {
+///     println!("{}", path.display());
+/// }
+/// ```
+/// Paths are yielded in alphabetical order.
+pub fn glob(pattern: &str) -> Result<Paths, PatternError> {
+    glob_with(pattern, MatchOptions::new())
+}
+
+/// Return an iterator that produces all the `Path`s that match the given
+/// pattern using the specified match options, which may be absolute or relative
+/// to the current working directory.
+///
+/// This may return an error if the pattern is invalid.
+///
+/// This function accepts Unix shell style patterns as described by
+/// `Pattern::new(..)`.  The options given are passed through unchanged to
+/// `Pattern::matches_with(..)` with the exception that
+/// `require_literal_separator` is always set to `true` regardless of the value
+/// passed to this function.
+///
+/// Paths are yielded in alphabetical order.
+pub fn glob_with(pattern: &str, options: MatchOptions) -> Result<Paths, PatternError> {
+    #[cfg(windows)]
+    fn check_windows_verbatim(p: &Path) -> bool {
+        match p.components().next() {
+            Some(Component::Prefix(ref p)) => p.kind().is_verbatim(),
+            _ => false,
+        }
+    }
+    #[cfg(not(windows))]
+    fn check_windows_verbatim(_: &Path) -> bool {
+        false
+    }
+
+    #[cfg(windows)]
+    fn to_scope(p: &Path) -> PathBuf {
+        // FIXME handle volume relative paths here
+        p.to_path_buf()
+    }
+    #[cfg(not(windows))]
+    fn to_scope(p: &Path) -> PathBuf {
+        p.to_path_buf()
+    }
+
+    // make sure that the pattern is valid first, else early return with error
+    if let Err(err) = Pattern::new(pattern) {
+        return Err(err);
+    }
+
+    let mut components = Path::new(pattern).components().peekable();
+    loop {
+        match components.peek() {
+            Some(&Component::Prefix(..)) | Some(&Component::RootDir) => {
+                components.next();
+            }
+            _ => break,
+        }
+    }
+    let rest = components.map(|s| s.as_os_str()).collect::<PathBuf>();
+    let normalized_pattern = Path::new(pattern).iter().collect::<PathBuf>();
+    let root_len = normalized_pattern.to_str().unwrap().len() - rest.to_str().unwrap().len();
+    let root = if root_len > 0 {
+        Some(Path::new(&pattern[..root_len]))
+    } else {
+        None
+    };
+
+    if root_len > 0 && check_windows_verbatim(root.unwrap()) {
+        // FIXME: How do we want to handle verbatim paths? I'm inclined to
+        // return nothing, since we can't very well find all UNC shares with a
+        // 1-letter server name.
+        return Ok(Paths {
+            dir_patterns: Vec::new(),
+            require_dir: false,
+            options,
+            todo: Vec::new(),
+            scope: None,
+        });
+    }
+
+    let scope = root.map_or_else(|| PathBuf::from("."), to_scope);
+
+    let mut dir_patterns = Vec::new();
+    let components =
+        pattern[cmp::min(root_len, pattern.len())..].split_terminator(path::is_separator);
+
+    for component in components {
+        dir_patterns.push(Pattern::new(component)?);
+    }
+
+    if root_len == pattern.len() {
+        dir_patterns.push(Pattern {
+            original: "".to_string(),
+            tokens: Vec::new(),
+            is_recursive: false,
+        });
+    }
+
+    let last_is_separator = pattern.chars().next_back().map(path::is_separator);
+    let require_dir = last_is_separator == Some(true);
+    let todo = Vec::new();
+
+    Ok(Paths {
+        dir_patterns,
+        require_dir,
+        options,
+        todo,
+        scope: Some(scope),
+    })
+}
+
+/// A glob iteration error.
+///
+/// This is typically returned when a particular path cannot be read
+/// to determine if its contents match the glob pattern. This is possible
+/// if the program lacks the appropriate permissions, for example.
+#[derive(Debug)]
+pub struct GlobError {
+    path: PathBuf,
+    error: io::Error,
+}
+
+impl GlobError {
+    /// The Path that the error corresponds to.
+    pub fn path(&self) -> &Path {
+        &self.path
+    }
+
+    /// The error in question.
+    pub fn error(&self) -> &io::Error {
+        &self.error
+    }
+
+    /// Consumes self, returning the _raw_ underlying `io::Error`
+    pub fn into_error(self) -> io::Error {
+        self.error
+    }
+}
+
+impl Error for GlobError {
+    #[allow(deprecated)]
+    fn description(&self) -> &str {
+        self.error.description()
+    }
+
+    #[allow(unknown_lints, bare_trait_objects)]
+    fn cause(&self) -> Option<&Error> {
+        Some(&self.error)
+    }
+}
+
+impl fmt::Display for GlobError {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(
+            f,
+            "attempting to read `{}` resulted in an error: {}",
+            self.path.display(),
+            self.error
+        )
+    }
+}
+
+fn is_dir(p: &Path) -> bool {
+    fs::metadata(p).map(|m| m.is_dir()).unwrap_or(false)
+}
+
+/// An alias for a glob iteration result.
+///
+/// This represents either a matched path or a glob iteration error,
+/// such as failing to read a particular directory's contents.
+pub type GlobResult = Result<PathBuf, GlobError>;
+
+impl Iterator for Paths {
+    type Item = GlobResult;
+
+    fn next(&mut self) -> Option<GlobResult> {
+        // the todo buffer hasn't been initialized yet, so it's done at this
+        // point rather than in glob() so that the errors are unified that is,
+        // failing to fill the buffer is an iteration error construction of the
+        // iterator (i.e. glob()) only fails if it fails to compile the Pattern
+        if let Some(scope) = self.scope.take() {
+            if !self.dir_patterns.is_empty() {
+                // Shouldn't happen, but we're using -1 as a special index.
+                assert!(self.dir_patterns.len() < !0 as usize);
+
+                fill_todo(&mut self.todo, &self.dir_patterns, 0, &scope, self.options);
+            }
+        }
+
+        loop {
+            if self.dir_patterns.is_empty() || self.todo.is_empty() {
+                return None;
+            }
+
+            let (path, mut idx) = match self.todo.pop().unwrap() {
+                Ok(pair) => pair,
+                Err(e) => return Some(Err(e)),
+            };
+
+            // idx -1: was already checked by fill_todo, maybe path was '.' or
+            // '..' that we can't match here because of normalization.
+            if idx == !0 as usize {
+                if self.require_dir && !is_dir(&path) {
+                    continue;
+                }
+                return Some(Ok(path));
+            }
+
+            if self.dir_patterns[idx].is_recursive {
+                let mut next = idx;
+
+                // collapse consecutive recursive patterns
+                while (next + 1) < self.dir_patterns.len()
+                    && self.dir_patterns[next + 1].is_recursive
+                {
+                    next += 1;
+                }
+
+                if is_dir(&path) {
+                    // the path is a directory, so it's a match
+
+                    // push this directory's contents
+                    fill_todo(
+                        &mut self.todo,
+                        &self.dir_patterns,
+                        next,
+                        &path,
+                        self.options,
+                    );
+
+                    if next == self.dir_patterns.len() - 1 {
+                        // pattern ends in recursive pattern, so return this
+                        // directory as a result
+                        return Some(Ok(path));
+                    } else {
+                        // advanced to the next pattern for this path
+                        idx = next + 1;
+                    }
+                } else if next == self.dir_patterns.len() - 1 {
+                    // not a directory and it's the last pattern, meaning no
+                    // match
+                    continue;
+                } else {
+                    // advanced to the next pattern for this path
+                    idx = next + 1;
+                }
+            }
+
+            // not recursive, so match normally
+            if self.dir_patterns[idx].matches_with(
+                {
+                    match path.file_name().and_then(|s| s.to_str()) {
+                        // FIXME (#9639): How do we handle non-utf8 filenames?
+                        // Ignore them for now; ideally we'd still match them
+                        // against a *
+                        None => continue,
+                        Some(x) => x,
+                    }
+                },
+                self.options,
+            ) {
+                if idx == self.dir_patterns.len() - 1 {
+                    // it is not possible for a pattern to match a directory
+                    // *AND* its children so we don't need to check the
+                    // children
+
+                    if !self.require_dir || is_dir(&path) {
+                        return Some(Ok(path));
+                    }
+                } else {
+                    fill_todo(
+                        &mut self.todo,
+                        &self.dir_patterns,
+                        idx + 1,
+                        &path,
+                        self.options,
+                    );
+                }
+            }
+        }
+    }
+}
+
+/// A pattern parsing error.
+#[derive(Debug)]
+#[allow(missing_copy_implementations)]
+pub struct PatternError {
+    /// The approximate character index of where the error occurred.
+    pub pos: usize,
+
+    /// A message describing the error.
+    pub msg: &'static str,
+}
+
+impl Error for PatternError {
+    fn description(&self) -> &str {
+        self.msg
+    }
+}
+
+impl fmt::Display for PatternError {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(
+            f,
+            "Pattern syntax error near position {}: {}",
+            self.pos, self.msg
+        )
+    }
+}
+
+/// A compiled Unix shell style pattern.
+///
+/// - `?` matches any single character.
+///
+/// - `*` matches any (possibly empty) sequence of characters.
+///
+/// - `**` matches the current directory and arbitrary subdirectories. This
+///   sequence **must** form a single path component, so both `**a` and `b**`
+///   are invalid and will result in an error.  A sequence of more than two
+///   consecutive `*` characters is also invalid.
+///
+/// - `[...]` matches any character inside the brackets.  Character sequences
+///   can also specify ranges of characters, as ordered by Unicode, so e.g.
+///   `[0-9]` specifies any character between 0 and 9 inclusive. An unclosed
+///   bracket is invalid.
+///
+/// - `[!...]` is the negation of `[...]`, i.e. it matches any characters
+///   **not** in the brackets.
+///
+/// - The metacharacters `?`, `*`, `[`, `]` can be matched by using brackets
+///   (e.g. `[?]`).  When a `]` occurs immediately following `[` or `[!` then it
+///   is interpreted as being part of, rather then ending, the character set, so
+///   `]` and NOT `]` can be matched by `[]]` and `[!]]` respectively.  The `-`
+///   character can be specified inside a character sequence pattern by placing
+///   it at the start or the end, e.g. `[abc-]`.
+#[derive(Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Default, Debug)]
+pub struct Pattern {
+    original: String,
+    tokens: Vec<PatternToken>,
+    is_recursive: bool,
+}
+
+/// Show the original glob pattern.
+impl fmt::Display for Pattern {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        self.original.fmt(f)
+    }
+}
+
+impl FromStr for Pattern {
+    type Err = PatternError;
+
+    fn from_str(s: &str) -> Result<Self, PatternError> {
+        Self::new(s)
+    }
+}
+
+#[derive(Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Debug)]
+enum PatternToken {
+    Char(char),
+    AnyChar,
+    AnySequence,
+    AnyRecursiveSequence,
+    AnyWithin(Vec<CharSpecifier>),
+    AnyExcept(Vec<CharSpecifier>),
+}
+
+#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Debug)]
+enum CharSpecifier {
+    SingleChar(char),
+    CharRange(char, char),
+}
+
+#[derive(Copy, Clone, PartialEq)]
+enum MatchResult {
+    Match,
+    SubPatternDoesntMatch,
+    EntirePatternDoesntMatch,
+}
+
+const ERROR_WILDCARDS: &str = "wildcards are either regular `*` or recursive `**`";
+const ERROR_RECURSIVE_WILDCARDS: &str = "recursive wildcards must form a single path \
+                                         component";
+const ERROR_INVALID_RANGE: &str = "invalid range pattern";
+
+impl Pattern {
+    /// This function compiles Unix shell style patterns.
+    ///
+    /// An invalid glob pattern will yield a `PatternError`.
+    pub fn new(pattern: &str) -> Result<Self, PatternError> {
+        let chars = pattern.chars().collect::<Vec<_>>();
+        let mut tokens = Vec::new();
+        let mut is_recursive = false;
+        let mut i = 0;
+
+        while i < chars.len() {
+            match chars[i] {
+                '?' => {
+                    tokens.push(AnyChar);
+                    i += 1;
+                }
+                '*' => {
+                    let old = i;
+
+                    while i < chars.len() && chars[i] == '*' {
+                        i += 1;
+                    }
+
+                    let count = i - old;
+
+                    if count > 2 {
+                        return Err(PatternError {
+                            pos: old + 2,
+                            msg: ERROR_WILDCARDS,
+                        });
+                    } else if count == 2 {
+                        // ** can only be an entire path component
+                        // i.e. a/**/b is valid, but a**/b or a/**b is not
+                        // invalid matches are treated literally
+                        let is_valid = if i == 2 || path::is_separator(chars[i - count - 1]) {
+                            // it ends in a '/'
+                            if i < chars.len() && path::is_separator(chars[i]) {
+                                i += 1;
+                                true
+                            // or the pattern ends here
+                            // this enables the existing globbing mechanism
+                            } else if i == chars.len() {
+                                true
+                            // `**` ends in non-separator
+                            } else {
+                                return Err(PatternError {
+                                    pos: i,
+                                    msg: ERROR_RECURSIVE_WILDCARDS,
+                                });
+                            }
+                        // `**` begins with non-separator
+                        } else {
+                            return Err(PatternError {
+                                pos: old - 1,
+                                msg: ERROR_RECURSIVE_WILDCARDS,
+                            });
+                        };
+
+                        if is_valid {
+                            // collapse consecutive AnyRecursiveSequence to a
+                            // single one
+
+                            let tokens_len = tokens.len();
+
+                            if !(tokens_len > 1 && tokens[tokens_len - 1] == AnyRecursiveSequence) {
+                                is_recursive = true;
+                                tokens.push(AnyRecursiveSequence);
+                            }
+                        }
+                    } else {
+                        tokens.push(AnySequence);
+                    }
+                }
+                '[' => {
+                    if i + 4 <= chars.len() && chars[i + 1] == '!' {
+                        match chars[i + 3..].iter().position(|x| *x == ']') {
+                            None => (),
+                            Some(j) => {
+                                let chars = &chars[i + 2..i + 3 + j];
+                                let cs = parse_char_specifiers(chars);
+                                tokens.push(AnyExcept(cs));
+                                i += j + 4;
+                                continue;
+                            }
+                        }
+                    } else if i + 3 <= chars.len() && chars[i + 1] != '!' {
+                        match chars[i + 2..].iter().position(|x| *x == ']') {
+                            None => (),
+                            Some(j) => {
+                                let cs = parse_char_specifiers(&chars[i + 1..i + 2 + j]);
+                                tokens.push(AnyWithin(cs));
+                                i += j + 3;
+                                continue;
+                            }
+                        }
+                    }
+
+                    // if we get here then this is not a valid range pattern
+                    return Err(PatternError {
+                        pos: i,
+                        msg: ERROR_INVALID_RANGE,
+                    });
+                }
+                c => {
+                    tokens.push(Char(c));
+                    i += 1;
+                }
+            }
+        }
+
+        Ok(Self {
+            tokens,
+            original: pattern.to_string(),
+            is_recursive,
+        })
+    }
+
+    /// Escape metacharacters within the given string by surrounding them in
+    /// brackets. The resulting string will, when compiled into a `Pattern`,
+    /// match the input string and nothing else.
+    pub fn escape(s: &str) -> String {
+        let mut escaped = String::new();
+        for c in s.chars() {
+            match c {
+                // note that ! does not need escaping because it is only special
+                // inside brackets
+                '?' | '*' | '[' | ']' => {
+                    escaped.push('[');
+                    escaped.push(c);
+                    escaped.push(']');
+                }
+                c => {
+                    escaped.push(c);
+                }
+            }
+        }
+        escaped
+    }
+
+    /// Return if the given `str` matches this `Pattern` using the default
+    /// match options (i.e. `MatchOptions::new()`).
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// use glob::Pattern;
+    ///
+    /// assert!(Pattern::new("c?t").unwrap().matches("cat"));
+    /// assert!(Pattern::new("k[!e]tteh").unwrap().matches("kitteh"));
+    /// assert!(Pattern::new("d*g").unwrap().matches("doog"));
+    /// ```
+    pub fn matches(&self, str: &str) -> bool {
+        self.matches_with(str, MatchOptions::new())
+    }
+
+    /// Return if the given `Path`, when converted to a `str`, matches this
+    /// `Pattern` using the default match options (i.e. `MatchOptions::new()`).
+    pub fn matches_path(&self, path: &Path) -> bool {
+        // FIXME (#9639): This needs to handle non-utf8 paths
+        path.to_str().map_or(false, |s| self.matches(s))
+    }
+
+    /// Return if the given `str` matches this `Pattern` using the specified
+    /// match options.
+    pub fn matches_with(&self, str: &str, options: MatchOptions) -> bool {
+        self.matches_from(true, str.chars(), 0, options) == Match
+    }
+
+    /// Return if the given `Path`, when converted to a `str`, matches this
+    /// `Pattern` using the specified match options.
+    pub fn matches_path_with(&self, path: &Path, options: MatchOptions) -> bool {
+        // FIXME (#9639): This needs to handle non-utf8 paths
+        path.to_str()
+            .map_or(false, |s| self.matches_with(s, options))
+    }
+
+    /// Access the original glob pattern.
+    pub fn as_str(&self) -> &str {
+        &self.original
+    }
+
+    fn matches_from(
+        &self,
+        mut follows_separator: bool,
+        mut file: std::str::Chars,
+        i: usize,
+        options: MatchOptions,
+    ) -> MatchResult {
+        for (ti, token) in self.tokens[i..].iter().enumerate() {
+            match *token {
+                AnySequence | AnyRecursiveSequence => {
+                    // ** must be at the start.
+                    debug_assert!(match *token {
+                        AnyRecursiveSequence => follows_separator,
+                        _ => true,
+                    });
+
+                    // Empty match
+                    match self.matches_from(follows_separator, file.clone(), i + ti + 1, options) {
+                        SubPatternDoesntMatch => (), // keep trying
+                        m => return m,
+                    };
+
+                    while let Some(c) = file.next() {
+                        if follows_separator && options.require_literal_leading_dot && c == '.' {
+                            return SubPatternDoesntMatch;
+                        }
+                        follows_separator = path::is_separator(c);
+                        match *token {
+                            AnyRecursiveSequence if !follows_separator => continue,
+                            AnySequence
+                                if options.require_literal_separator && follows_separator =>
+                            {
+                                return SubPatternDoesntMatch
+                            }
+                            _ => (),
+                        }
+                        match self.matches_from(
+                            follows_separator,
+                            file.clone(),
+                            i + ti + 1,
+                            options,
+                        ) {
+                            SubPatternDoesntMatch => (), // keep trying
+                            m => return m,
+                        }
+                    }
+                }
+                _ => {
+                    let c = match file.next() {
+                        Some(c) => c,
+                        None => return EntirePatternDoesntMatch,
+                    };
+
+                    let is_sep = path::is_separator(c);
+
+                    if !match *token {
+                        AnyChar | AnyWithin(..) | AnyExcept(..)
+                            if (options.require_literal_separator && is_sep)
+                                || (follows_separator
+                                    && options.require_literal_leading_dot
+                                    && c == '.') =>
+                        {
+                            false
+                        }
+                        AnyChar => true,
+                        AnyWithin(ref specifiers) => in_char_specifiers(&specifiers, c, options),
+                        AnyExcept(ref specifiers) => !in_char_specifiers(&specifiers, c, options),
+                        Char(c2) => chars_eq(c, c2, options.case_sensitive),
+                        AnySequence | AnyRecursiveSequence => unreachable!(),
+                    } {
+                        return SubPatternDoesntMatch;
+                    }
+                    follows_separator = is_sep;
+                }
+            }
+        }
+
+        // Iter is fused.
+        if file.next().is_none() {
+            Match
+        } else {
+            SubPatternDoesntMatch
+        }
+    }
+}
+
+// Fills `todo` with paths under `path` to be matched by `patterns[idx]`,
+// special-casing patterns to match `.` and `..`, and avoiding `readdir()`
+// calls when there are no metacharacters in the pattern.
+fn fill_todo(
+    todo: &mut Vec<Result<(PathBuf, usize), GlobError>>,
+    patterns: &[Pattern],
+    idx: usize,
+    path: &Path,
+    options: MatchOptions,
+) {
+    // convert a pattern that's just many Char(_) to a string
+    fn pattern_as_str(pattern: &Pattern) -> Option<String> {
+        let mut s = String::new();
+        for token in &pattern.tokens {
+            match *token {
+                Char(c) => s.push(c),
+                _ => return None,
+            }
+        }
+
+        Some(s)
+    }
+
+    let add = |todo: &mut Vec<_>, next_path: PathBuf| {
+        if idx + 1 == patterns.len() {
+            // We know it's good, so don't make the iterator match this path
+            // against the pattern again. In particular, it can't match
+            // . or .. globs since these never show up as path components.
+            todo.push(Ok((next_path, !0 as usize)));
+        } else {
+            fill_todo(todo, patterns, idx + 1, &next_path, options);
+        }
+    };
+
+    let pattern = &patterns[idx];
+    let is_dir = is_dir(path);
+    let curdir = path == Path::new(".");
+    match pattern_as_str(pattern) {
+        Some(s) => {
+            // This pattern component doesn't have any metacharacters, so we
+            // don't need to read the current directory to know where to
+            // continue. So instead of passing control back to the iterator,
+            // we can just check for that one entry and potentially recurse
+            // right away.
+            let special = "." == s || ".." == s;
+            let next_path = if curdir {
+                PathBuf::from(s)
+            } else {
+                path.join(&s)
+            };
+            if (special && is_dir) || (!special && fs::metadata(&next_path).is_ok()) {
+                add(todo, next_path);
+            }
+        }
+        None if is_dir => {
+            let dirs = fs::read_dir(path).and_then(|d| {
+                d.map(|e| {
+                    e.map(|e| {
+                        if curdir {
+                            PathBuf::from(e.path().file_name().unwrap())
+                        } else {
+                            e.path()
+                        }
+                    })
+                })
+                .collect::<Result<Vec<_>, _>>()
+            });
+            match dirs {
+                Ok(mut children) => {
+                    children.sort_by(|p1, p2| p2.file_name().cmp(&p1.file_name()));
+                    todo.extend(children.into_iter().map(|x| Ok((x, idx))));
+
+                    // Matching the special directory entries . and .. that
+                    // refer to the current and parent directory respectively
+                    // requires that the pattern has a leading dot, even if the
+                    // `MatchOptions` field `require_literal_leading_dot` is not
+                    // set.
+                    if !pattern.tokens.is_empty() && pattern.tokens[0] == Char('.') {
+                        for &special in &[".", ".."] {
+                            if pattern.matches_with(special, options) {
+                                add(todo, path.join(special));
+                            }
+                        }
+                    }
+                }
+                Err(e) => {
+                    todo.push(Err(GlobError {
+                        path: path.to_path_buf(),
+                        error: e,
+                    }));
+                }
+            }
+        }
+        None => {
+            // not a directory, nothing more to find
+        }
+    }
+}
+
+fn parse_char_specifiers(s: &[char]) -> Vec<CharSpecifier> {
+    let mut cs = Vec::new();
+    let mut i = 0;
+    while i < s.len() {
+        if i + 3 <= s.len() && s[i + 1] == '-' {
+            cs.push(CharRange(s[i], s[i + 2]));
+            i += 3;
+        } else {
+            cs.push(SingleChar(s[i]));
+            i += 1;
+        }
+    }
+    cs
+}
+
+fn in_char_specifiers(specifiers: &[CharSpecifier], c: char, options: MatchOptions) -> bool {
+    for &specifier in specifiers.iter() {
+        match specifier {
+            SingleChar(sc) => {
+                if chars_eq(c, sc, options.case_sensitive) {
+                    return true;
+                }
+            }
+            CharRange(start, end) => {
+                // FIXME: work with non-ascii chars properly (issue #1347)
+                if !options.case_sensitive && c.is_ascii() && start.is_ascii() && end.is_ascii() {
+                    let start = start.to_ascii_lowercase();
+                    let end = end.to_ascii_lowercase();
+
+                    let start_up = start.to_uppercase().next().unwrap();
+                    let end_up = end.to_uppercase().next().unwrap();
+
+                    // only allow case insensitive matching when
+                    // both start and end are within a-z or A-Z
+                    if start != start_up && end != end_up {
+                        let c = c.to_ascii_lowercase();
+                        if c >= start && c <= end {
+                            return true;
+                        }
+                    }
+                }
+
+                if c >= start && c <= end {
+                    return true;
+                }
+            }
+        }
+    }
+
+    false
+}
+
+/// A helper function to determine if two chars are (possibly case-insensitively) equal.
+fn chars_eq(a: char, b: char, case_sensitive: bool) -> bool {
+    if cfg!(windows) && path::is_separator(a) && path::is_separator(b) {
+        true
+    } else if !case_sensitive && a.is_ascii() && b.is_ascii() {
+        // FIXME: work with non-ascii chars properly (issue #9084)
+        a.to_ascii_lowercase() == b.to_ascii_lowercase()
+    } else {
+        a == b
+    }
+}
+
+/// Configuration options to modify the behaviour of `Pattern::matches_with(..)`.
+#[allow(missing_copy_implementations)]
+#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Default)]
+pub struct MatchOptions {
+    /// Whether or not patterns should be matched in a case-sensitive manner.
+    /// This currently only considers upper/lower case relationships between
+    /// ASCII characters, but in future this might be extended to work with
+    /// Unicode.
+    pub case_sensitive: bool,
+
+    /// Whether or not path-component separator characters (e.g. `/` on
+    /// Posix) must be matched by a literal `/`, rather than by `*` or `?` or
+    /// `[...]`.
+    pub require_literal_separator: bool,
+
+    /// Whether or not paths that contain components that start with a `.`
+    /// will require that `.` appears literally in the pattern; `*`, `?`, `**`,
+    /// or `[...]` will not match. This is useful because such files are
+    /// conventionally considered hidden on Unix systems and it might be
+    /// desirable to skip them when listing files.
+    pub require_literal_leading_dot: bool,
+}
+
+impl MatchOptions {
+    /// Constructs a new `MatchOptions` with default field values. This is used
+    /// when calling functions that do not take an explicit `MatchOptions`
+    /// parameter.
+    ///
+    /// This function always returns this value:
+    ///
+    /// ```rust,ignore
+    /// MatchOptions {
+    ///     case_sensitive: true,
+    ///     require_literal_separator: false,
+    ///     require_literal_leading_dot: false
+    /// }
+    /// ```
+    ///
+    /// # Note
+    /// The behavior of this method doesn't match `default()`'s. This returns
+    /// `case_sensitive` as `true` while `default()` does it as `false`.
+    // FIXME: Consider unity the behavior with `default()` in a next major release.
+    pub fn new() -> Self {
+        Self {
+            case_sensitive: true,
+            require_literal_separator: false,
+            require_literal_leading_dot: false,
+        }
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::{glob, MatchOptions, Pattern};
+    use std::path::Path;
+
+    #[test]
+    fn test_pattern_from_str() {
+        assert!("a*b".parse::<Pattern>().unwrap().matches("a_b"));
+        assert!("a/**b".parse::<Pattern>().unwrap_err().pos == 4);
+    }
+
+    #[test]
+    fn test_wildcard_errors() {
+        assert!(Pattern::new("a/**b").unwrap_err().pos == 4);
+        assert!(Pattern::new("a/bc**").unwrap_err().pos == 3);
+        assert!(Pattern::new("a/*****").unwrap_err().pos == 4);
+        assert!(Pattern::new("a/b**c**d").unwrap_err().pos == 2);
+        assert!(Pattern::new("a**b").unwrap_err().pos == 0);
+    }
+
+    #[test]
+    fn test_unclosed_bracket_errors() {
+        assert!(Pattern::new("abc[def").unwrap_err().pos == 3);
+        assert!(Pattern::new("abc[!def").unwrap_err().pos == 3);
+        assert!(Pattern::new("abc[").unwrap_err().pos == 3);
+        assert!(Pattern::new("abc[!").unwrap_err().pos == 3);
+        assert!(Pattern::new("abc[d").unwrap_err().pos == 3);
+        assert!(Pattern::new("abc[!d").unwrap_err().pos == 3);
+        assert!(Pattern::new("abc[]").unwrap_err().pos == 3);
+        assert!(Pattern::new("abc[!]").unwrap_err().pos == 3);
+    }
+
+    #[test]
+    fn test_glob_errors() {
+        assert!(glob("a/**b").err().unwrap().pos == 4);
+        assert!(glob("abc[def").err().unwrap().pos == 3);
+    }
+
+    // this test assumes that there is a /root directory and that
+    // the user running this test is not root or otherwise doesn't
+    // have permission to read its contents
+    #[cfg(all(unix, not(target_os = "macos")))]
+    #[test]
+    fn test_iteration_errors() {
+        use std::io;
+        let mut iter = glob("/root/*").unwrap();
+
+        // GlobErrors shouldn't halt iteration
+        let next = iter.next();
+        assert!(next.is_some());
+
+        let err = next.unwrap();
+        assert!(err.is_err());
+
+        let err = err.err().unwrap();
+        assert!(err.path() == Path::new("/root"));
+        assert!(err.error().kind() == io::ErrorKind::PermissionDenied);
+    }
+
+    #[test]
+    fn test_absolute_pattern() {
+        assert!(glob("/").unwrap().next().is_some());
+        assert!(glob("//").unwrap().next().is_some());
+
+        // assume that the filesystem is not empty!
+        assert!(glob("/*").unwrap().next().is_some());
+
+        #[cfg(not(windows))]
+        fn win() {}
+
+        #[cfg(windows)]
+        fn win() {
+            use std::env::current_dir;
+            use std::path::Component;
+
+            // check windows absolute paths with host/device components
+            let root_with_device = current_dir()
+                .ok()
+                .and_then(|p| {
+                    match p.components().next().unwrap() {
+                        Component::Prefix(prefix_component) => {
+                            let path = Path::new(prefix_component.as_os_str());
+                            path.join("*");
+                            Some(path.to_path_buf())
+                        }
+                        _ => panic!("no prefix in this path"),
+                    }
+                })
+                .unwrap();
+            // FIXME (#9639): This needs to handle non-utf8 paths
+            assert!(glob(root_with_device.as_os_str().to_str().unwrap())
+                .unwrap()
+                .next()
+                .is_some());
+        }
+        win()
+    }
+
+    #[test]
+    fn test_wildcards() {
+        assert!(Pattern::new("a*b").unwrap().matches("a_b"));
+        assert!(Pattern::new("a*b*c").unwrap().matches("abc"));
+        assert!(!Pattern::new("a*b*c").unwrap().matches("abcd"));
+        assert!(Pattern::new("a*b*c").unwrap().matches("a_b_c"));
+        assert!(Pattern::new("a*b*c").unwrap().matches("a___b___c"));
+        assert!(Pattern::new("abc*abc*abc")
+            .unwrap()
+            .matches("abcabcabcabcabcabcabc"));
+        assert!(!Pattern::new("abc*abc*abc")
+            .unwrap()
+            .matches("abcabcabcabcabcabcabca"));
+        assert!(Pattern::new("a*a*a*a*a*a*a*a*a")
+            .unwrap()
+            .matches("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"));
+        assert!(Pattern::new("a*b[xyz]c*d").unwrap().matches("abxcdbxcddd"));
+    }
+
+    #[test]
+    fn test_recursive_wildcards() {
+        let pat = Pattern::new("some/**/needle.txt").unwrap();
+        assert!(pat.matches("some/needle.txt"));
+        assert!(pat.matches("some/one/needle.txt"));
+        assert!(pat.matches("some/one/two/needle.txt"));
+        assert!(pat.matches("some/other/needle.txt"));
+        assert!(!pat.matches("some/other/notthis.txt"));
+
+        // a single ** should be valid, for globs
+        // Should accept anything
+        let pat = Pattern::new("**").unwrap();
+        assert!(pat.is_recursive);
+        assert!(pat.matches("abcde"));
+        assert!(pat.matches(""));
+        assert!(pat.matches(".asdf"));
+        assert!(pat.matches("/x/.asdf"));
+
+        // collapse consecutive wildcards
+        let pat = Pattern::new("some/**/**/needle.txt").unwrap();
+        assert!(pat.matches("some/needle.txt"));
+        assert!(pat.matches("some/one/needle.txt"));
+        assert!(pat.matches("some/one/two/needle.txt"));
+        assert!(pat.matches("some/other/needle.txt"));
+        assert!(!pat.matches("some/other/notthis.txt"));
+
+        // ** can begin the pattern
+        let pat = Pattern::new("**/test").unwrap();
+        assert!(pat.matches("one/two/test"));
+        assert!(pat.matches("one/test"));
+        assert!(pat.matches("test"));
+
+        // /** can begin the pattern
+        let pat = Pattern::new("/**/test").unwrap();
+        assert!(pat.matches("/one/two/test"));
+        assert!(pat.matches("/one/test"));
+        assert!(pat.matches("/test"));
+        assert!(!pat.matches("/one/notthis"));
+        assert!(!pat.matches("/notthis"));
+
+        // Only start sub-patterns on start of path segment.
+        let pat = Pattern::new("**/.*").unwrap();
+        assert!(pat.matches(".abc"));
+        assert!(pat.matches("abc/.abc"));
+        assert!(!pat.matches("ab.c"));
+        assert!(!pat.matches("abc/ab.c"));
+    }
+
+    #[test]
+    fn test_lots_of_files() {
+        // this is a good test because it touches lots of differently named files
+        glob("/*/*/*/*").unwrap().skip(10000).next();
+    }
+
+    #[test]
+    fn test_range_pattern() {
+        let pat = Pattern::new("a[0-9]b").unwrap();
+        for i in 0..10 {
+            assert!(pat.matches(&format!("a{}b", i)));
+        }
+        assert!(!pat.matches("a_b"));
+
+        let pat = Pattern::new("a[!0-9]b").unwrap();
+        for i in 0..10 {
+            assert!(!pat.matches(&format!("a{}b", i)));
+        }
+        assert!(pat.matches("a_b"));
+
+        let pats = ["[a-z123]", "[1a-z23]", "[123a-z]"];
+        for &p in pats.iter() {
+            let pat = Pattern::new(p).unwrap();
+            for c in "abcdefghijklmnopqrstuvwxyz".chars() {
+                assert!(pat.matches(&c.to_string()));
+            }
+            for c in "ABCDEFGHIJKLMNOPQRSTUVWXYZ".chars() {
+                let options = MatchOptions {
+                    case_sensitive: false,
+                    ..MatchOptions::new()
+                };
+                assert!(pat.matches_with(&c.to_string(), options));
+            }
+            assert!(pat.matches("1"));
+            assert!(pat.matches("2"));
+            assert!(pat.matches("3"));
+        }
+
+        let pats = ["[abc-]", "[-abc]", "[a-c-]"];
+        for &p in pats.iter() {
+            let pat = Pattern::new(p).unwrap();
+            assert!(pat.matches("a"));
+            assert!(pat.matches("b"));
+            assert!(pat.matches("c"));
+            assert!(pat.matches("-"));
+            assert!(!pat.matches("d"));
+        }
+
+        let pat = Pattern::new("[2-1]").unwrap();
+        assert!(!pat.matches("1"));
+        assert!(!pat.matches("2"));
+
+        assert!(Pattern::new("[-]").unwrap().matches("-"));
+        assert!(!Pattern::new("[!-]").unwrap().matches("-"));
+    }
+
+    #[test]
+    fn test_pattern_matches() {
+        let txt_pat = Pattern::new("*hello.txt").unwrap();
+        assert!(txt_pat.matches("hello.txt"));
+        assert!(txt_pat.matches("gareth_says_hello.txt"));
+        assert!(txt_pat.matches("some/path/to/hello.txt"));
+        assert!(txt_pat.matches("some\\path\\to\\hello.txt"));
+        assert!(txt_pat.matches("/an/absolute/path/to/hello.txt"));
+        assert!(!txt_pat.matches("hello.txt-and-then-some"));
+        assert!(!txt_pat.matches("goodbye.txt"));
+
+        let dir_pat = Pattern::new("*some/path/to/hello.txt").unwrap();
+        assert!(dir_pat.matches("some/path/to/hello.txt"));
+        assert!(dir_pat.matches("a/bigger/some/path/to/hello.txt"));
+        assert!(!dir_pat.matches("some/path/to/hello.txt-and-then-some"));
+        assert!(!dir_pat.matches("some/other/path/to/hello.txt"));
+    }
+
+    #[test]
+    fn test_pattern_escape() {
+        let s = "_[_]_?_*_!_";
+        assert_eq!(Pattern::escape(s), "_[[]_[]]_[?]_[*]_!_".to_string());
+        assert!(Pattern::new(&Pattern::escape(s)).unwrap().matches(s));
+    }
+
+    #[test]
+    fn test_pattern_matches_case_insensitive() {
+        let pat = Pattern::new("aBcDeFg").unwrap();
+        let options = MatchOptions {
+            case_sensitive: false,
+            require_literal_separator: false,
+            require_literal_leading_dot: false,
+        };
+
+        assert!(pat.matches_with("aBcDeFg", options));
+        assert!(pat.matches_with("abcdefg", options));
+        assert!(pat.matches_with("ABCDEFG", options));
+        assert!(pat.matches_with("AbCdEfG", options));
+    }
+
+    #[test]
+    fn test_pattern_matches_case_insensitive_range() {
+        let pat_within = Pattern::new("[a]").unwrap();
+        let pat_except = Pattern::new("[!a]").unwrap();
+
+        let options_case_insensitive = MatchOptions {
+            case_sensitive: false,
+            require_literal_separator: false,
+            require_literal_leading_dot: false,
+        };
+        let options_case_sensitive = MatchOptions {
+            case_sensitive: true,
+            require_literal_separator: false,
+            require_literal_leading_dot: false,
+        };
+
+        assert!(pat_within.matches_with("a", options_case_insensitive));
+        assert!(pat_within.matches_with("A", options_case_insensitive));
+        assert!(!pat_within.matches_with("A", options_case_sensitive));
+
+        assert!(!pat_except.matches_with("a", options_case_insensitive));
+        assert!(!pat_except.matches_with("A", options_case_insensitive));
+        assert!(pat_except.matches_with("A", options_case_sensitive));
+    }
+
+    #[test]
+    fn test_pattern_matches_require_literal_separator() {
+        let options_require_literal = MatchOptions {
+            case_sensitive: true,
+            require_literal_separator: true,
+            require_literal_leading_dot: false,
+        };
+        let options_not_require_literal = MatchOptions {
+            case_sensitive: true,
+            require_literal_separator: false,
+            require_literal_leading_dot: false,
+        };
+
+        assert!(Pattern::new("abc/def")
+            .unwrap()
+            .matches_with("abc/def", options_require_literal));
+        assert!(!Pattern::new("abc?def")
+            .unwrap()
+            .matches_with("abc/def", options_require_literal));
+        assert!(!Pattern::new("abc*def")
+            .unwrap()
+            .matches_with("abc/def", options_require_literal));
+        assert!(!Pattern::new("abc[/]def")
+            .unwrap()
+            .matches_with("abc/def", options_require_literal));
+
+        assert!(Pattern::new("abc/def")
+            .unwrap()
+            .matches_with("abc/def", options_not_require_literal));
+        assert!(Pattern::new("abc?def")
+            .unwrap()
+            .matches_with("abc/def", options_not_require_literal));
+        assert!(Pattern::new("abc*def")
+            .unwrap()
+            .matches_with("abc/def", options_not_require_literal));
+        assert!(Pattern::new("abc[/]def")
+            .unwrap()
+            .matches_with("abc/def", options_not_require_literal));
+    }
+
+    #[test]
+    fn test_pattern_matches_require_literal_leading_dot() {
+        let options_require_literal_leading_dot = MatchOptions {
+            case_sensitive: true,
+            require_literal_separator: false,
+            require_literal_leading_dot: true,
+        };
+        let options_not_require_literal_leading_dot = MatchOptions {
+            case_sensitive: true,
+            require_literal_separator: false,
+            require_literal_leading_dot: false,
+        };
+
+        let f = |options| {
+            Pattern::new("*.txt")
+                .unwrap()
+                .matches_with(".hello.txt", options)
+        };
+        assert!(f(options_not_require_literal_leading_dot));
+        assert!(!f(options_require_literal_leading_dot));
+
+        let f = |options| {
+            Pattern::new(".*.*")
+                .unwrap()
+                .matches_with(".hello.txt", options)
+        };
+        assert!(f(options_not_require_literal_leading_dot));
+        assert!(f(options_require_literal_leading_dot));
+
+        let f = |options| {
+            Pattern::new("aaa/bbb/*")
+                .unwrap()
+                .matches_with("aaa/bbb/.ccc", options)
+        };
+        assert!(f(options_not_require_literal_leading_dot));
+        assert!(!f(options_require_literal_leading_dot));
+
+        let f = |options| {
+            Pattern::new("aaa/bbb/*")
+                .unwrap()
+                .matches_with("aaa/bbb/c.c.c.", options)
+        };
+        assert!(f(options_not_require_literal_leading_dot));
+        assert!(f(options_require_literal_leading_dot));
+
+        let f = |options| {
+            Pattern::new("aaa/bbb/.*")
+                .unwrap()
+                .matches_with("aaa/bbb/.ccc", options)
+        };
+        assert!(f(options_not_require_literal_leading_dot));
+        assert!(f(options_require_literal_leading_dot));
+
+        let f = |options| {
+            Pattern::new("aaa/?bbb")
+                .unwrap()
+                .matches_with("aaa/.bbb", options)
+        };
+        assert!(f(options_not_require_literal_leading_dot));
+        assert!(!f(options_require_literal_leading_dot));
+
+        let f = |options| {
+            Pattern::new("aaa/[.]bbb")
+                .unwrap()
+                .matches_with("aaa/.bbb", options)
+        };
+        assert!(f(options_not_require_literal_leading_dot));
+        assert!(!f(options_require_literal_leading_dot));
+
+        let f = |options| Pattern::new("**/*").unwrap().matches_with(".bbb", options);
+        assert!(f(options_not_require_literal_leading_dot));
+        assert!(!f(options_require_literal_leading_dot));
+    }
+
+    #[test]
+    fn test_matches_path() {
+        // on windows, (Path::new("a/b").as_str().unwrap() == "a\\b"), so this
+        // tests that / and \ are considered equivalent on windows
+        assert!(Pattern::new("a/b").unwrap().matches_path(&Path::new("a/b")));
+    }
+
+    #[test]
+    fn test_path_join() {
+        let pattern = Path::new("one").join(&Path::new("**/*.rs"));
+        assert!(Pattern::new(pattern.to_str().unwrap()).is_ok());
+    }
+}