1 files changed, 187 insertions, 0 deletions
diff --git a/third_party/rust/url/src/path_segments.rs b/third_party/rust/url/src/path_segments.rs
new file mode 100644
index 000000000..437a84ee7
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+++ b/third_party/rust/url/src/path_segments.rs
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+// Copyright 2016 The rust-url developers.
+//
+// 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.
+
+use parser::{self, SchemeType, to_u32};
+use std::str;
+use Url;
+
+/// Exposes methods to manipulate the path of an URL that is not cannot-be-base.
+///
+/// The path always starts with a `/` slash, and is made of slash-separated segments.
+/// There is always at least one segment (which may be the empty string).
+///
+/// Examples:
+///
+/// ```rust
+/// # use url::Url;
+/// let mut url = Url::parse("mailto:me@example.com").unwrap();
+/// assert!(url.path_segments_mut().is_err());
+///
+/// let mut url = Url::parse("http://example.net/foo/index.html").unwrap();
+/// url.path_segments_mut().unwrap().pop().push("img").push("2/100%.png");
+/// assert_eq!(url.as_str(), "http://example.net/foo/img/2%2F100%25.png");
+/// ```
+pub struct PathSegmentsMut<'a> {
+    url: &'a mut Url,
+    after_first_slash: usize,
+    after_path: String,
+    old_after_path_position: u32,
+}
+
+// Not re-exported outside the crate
+pub fn new(url: &mut Url) -> PathSegmentsMut {
+    let after_path = url.take_after_path();
+    let old_after_path_position = to_u32(url.serialization.len()).unwrap();
+    debug_assert!(url.byte_at(url.path_start) == b'/');
+    PathSegmentsMut {
+        after_first_slash: url.path_start as usize + "/".len(),
+        url: url,
+        old_after_path_position: old_after_path_position,
+        after_path: after_path,
+    }
+}
+
+impl<'a> Drop for PathSegmentsMut<'a> {
+    fn drop(&mut self) {
+        self.url.restore_after_path(self.old_after_path_position, &self.after_path)
+    }
+}
+
+impl<'a> PathSegmentsMut<'a> {
+    /// Remove all segments in the path, leaving the minimal `url.path() == "/"`.
+    ///
+    /// Returns `&mut Self` so that method calls can be chained.
+    ///
+    /// Example:
+    ///
+    /// ```rust
+    /// # use url::Url;
+    /// let mut url = Url::parse("https://github.com/servo/rust-url/").unwrap();
+    /// url.path_segments_mut().unwrap().clear().push("logout");
+    /// assert_eq!(url.as_str(), "https://github.com/logout");
+    /// ```
+    pub fn clear(&mut self) -> &mut Self {
+        self.url.serialization.truncate(self.after_first_slash);
+        self
+    }
+
+    /// Remove the last segment of this URL’s path if it is empty,
+    /// except if these was only one segment to begin with.
+    ///
+    /// In other words, remove one path trailing slash, if any,
+    /// unless it is also the initial slash (so this does nothing if `url.path() == "/")`.
+    ///
+    /// Returns `&mut Self` so that method calls can be chained.
+    ///
+    /// Example:
+    ///
+    /// ```rust
+    /// # use url::Url;
+    /// let mut url = Url::parse("https://github.com/servo/rust-url/").unwrap();
+    /// url.path_segments_mut().unwrap().push("pulls");
+    /// assert_eq!(url.as_str(), "https://github.com/servo/rust-url//pulls");
+    ///
+    /// let mut url = Url::parse("https://github.com/servo/rust-url/").unwrap();
+    /// url.path_segments_mut().unwrap().pop_if_empty().push("pulls");
+    /// assert_eq!(url.as_str(), "https://github.com/servo/rust-url/pulls");
+    /// ```
+    pub fn pop_if_empty(&mut self) -> &mut Self {
+        if self.url.serialization[self.after_first_slash..].ends_with('/') {
+            self.url.serialization.pop();
+        }
+        self
+    }
+
+    /// Remove the last segment of this URL’s path.
+    ///
+    /// If the path only has one segment, make it empty such that `url.path() == "/"`.
+    ///
+    /// Returns `&mut Self` so that method calls can be chained.
+    pub fn pop(&mut self) -> &mut Self {
+        let last_slash = self.url.serialization[self.after_first_slash..].rfind('/').unwrap_or(0);
+        self.url.serialization.truncate(self.after_first_slash + last_slash);
+        self
+    }
+
+    /// Append the given segment at the end of this URL’s path.
+    ///
+    /// See the documentation for `.extend()`.
+    ///
+    /// Returns `&mut Self` so that method calls can be chained.
+    pub fn push(&mut self, segment: &str) -> &mut Self {
+        self.extend(Some(segment))
+    }
+
+    /// Append each segment from the given iterator at the end of this URL’s path.
+    ///
+    /// Each segment is percent-encoded like in `Url::parse` or `Url::join`,
+    /// except that `%` and `/` characters are also encoded (to `%25` and `%2F`).
+    /// This is unlike `Url::parse` where `%` is left as-is in case some of the input
+    /// is already percent-encoded, and `/` denotes a path segment separator.)
+    ///
+    /// Note that, in addition to slashes between new segments,
+    /// this always adds a slash between the existing path and the new segments
+    /// *except* if the existing path is `"/"`.
+    /// If the previous last segment was empty (if the path had a trailing slash)
+    /// the path after `.extend()` will contain two consecutive slashes.
+    /// If that is undesired, call `.pop_if_empty()` first.
+    ///
+    /// To obtain a behavior similar to `Url::join`, call `.pop()` unconditionally first.
+    ///
+    /// Returns `&mut Self` so that method calls can be chained.
+    ///
+    /// Example:
+    ///
+    /// ```rust
+    /// # use url::Url;
+    /// let mut url = Url::parse("https://github.com/").unwrap();
+    /// let org = "servo";
+    /// let repo = "rust-url";
+    /// let issue_number = "188";
+    /// url.path_segments_mut().unwrap().extend(&[org, repo, "issues", issue_number]);
+    /// assert_eq!(url.as_str(), "https://github.com/servo/rust-url/issues/188");
+    /// ```
+    ///
+    /// In order to make sure that parsing the serialization of an URL gives the same URL,
+    /// a segment is ignored if it is `"."` or `".."`:
+    ///
+    /// ```rust
+    /// # use url::Url;
+    /// let mut url = Url::parse("https://github.com/servo").unwrap();
+    /// url.path_segments_mut().unwrap().extend(&["..", "rust-url", ".", "pulls"]);
+    /// assert_eq!(url.as_str(), "https://github.com/servo/rust-url/pulls");
+    /// ```
+    pub fn extend<I>(&mut self, segments: I) -> &mut Self
+    where I: IntoIterator, I::Item: AsRef<str> {
+        let scheme_type = SchemeType::from(self.url.scheme());
+        let path_start = self.url.path_start as usize;
+        self.url.mutate(|parser| {
+            parser.context = parser::Context::PathSegmentSetter;
+            for segment in segments {
+                let segment = segment.as_ref();
+                if matches!(segment, "." | "..") {
+                    continue
+                }
+                if parser.serialization.len() > path_start + 1 {
+                    parser.serialization.push('/');
+                }
+                let mut has_host = true;  // FIXME account for this?
+                parser.parse_path(scheme_type, &mut has_host, path_start,
+                                  parser::Input::new(segment));
+            }
+        });
+        self
+    }
+
+    /// For internal testing, not part of the public API.
+    #[doc(hidden)]
+    pub fn assert_url_invariants(&mut self) -> &mut Self {
+        self.url.assert_invariants();
+        self
+    }
+}