std: Move platform specific path code into sys

4 files changed, 139 insertions, 0 deletions

diff --git a/src/libstd/sys/unix/mod.rs b/src/libstd/sys/unix/mod.rs
index 3fbeda58e82..e61944315a0 100644
--- a/src/libstd/sys/unix/mod.rs
+++ b/src/libstd/sys/unix/mod.rs
@@ -41,6 +41,7 @@ pub mod mutex;
 pub mod net;
 pub mod os;
 pub mod os_str;
+pub mod path;
 pub mod pipe;
 pub mod process;
 pub mod rand;
diff --git a/src/libstd/sys/unix/path.rs b/src/libstd/sys/unix/path.rs
new file mode 100644
index 00000000000..bf9af7a4353
--- /dev/null
+++ b/src/libstd/sys/unix/path.rs
@@ -0,0 +1,29 @@
+// Copyright 2015 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.
+
+use path::Prefix;
+use ffi::OsStr;
+
+#[inline]
+pub fn is_sep_byte(b: u8) -> bool {
+    b == b'/'
+}
+
+#[inline]
+pub fn is_verbatim_sep(b: u8) -> bool {
+    b == b'/'
+}
+
+pub fn parse_prefix(_: &OsStr) -> Option<Prefix> {
+    None
+}
+
+pub const MAIN_SEP_STR: &'static str = "/";
+pub const MAIN_SEP: char = '/';
diff --git a/src/libstd/sys/windows/mod.rs b/src/libstd/sys/windows/mod.rs
index 9741a704e8f..21404f4fbeb 100644
--- a/src/libstd/sys/windows/mod.rs
+++ b/src/libstd/sys/windows/mod.rs
@@ -29,6 +29,7 @@ pub mod mutex;
 pub mod net;
 pub mod os;
 pub mod os_str;
+pub mod path;
 pub mod pipe;
 pub mod process;
 pub mod rand;
diff --git a/src/libstd/sys/windows/path.rs b/src/libstd/sys/windows/path.rs
new file mode 100644
index 00000000000..2b47808451b
--- /dev/null
+++ b/src/libstd/sys/windows/path.rs
@@ -0,0 +1,108 @@
+// Copyright 2015 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.
+
+use ascii::*;
+
+use path::Prefix;
+use ffi::OsStr;
+use mem;
+
+fn os_str_as_u8_slice(s: &OsStr) -> &[u8] {
+    unsafe { mem::transmute(s) }
+}
+unsafe fn u8_slice_as_os_str(s: &[u8]) -> &OsStr {
+    mem::transmute(s)
+}
+
+#[inline]
+pub fn is_sep_byte(b: u8) -> bool {
+    b == b'/' || b == b'\\'
+}
+
+#[inline]
+pub fn is_verbatim_sep(b: u8) -> bool {
+    b == b'\\'
+}
+
+pub fn parse_prefix<'a>(path: &'a OsStr) -> Option<Prefix> {
+    use path::Prefix::*;
+    unsafe {
+        // The unsafety here stems from converting between &OsStr and &[u8]
+        // and back. This is safe to do because (1) we only look at ASCII
+        // contents of the encoding and (2) new &OsStr values are produced
+        // only from ASCII-bounded slices of existing &OsStr values.
+        let mut path = os_str_as_u8_slice(path);
+
+        if path.starts_with(br"\\") {
+            // \\
+            path = &path[2..];
+            if path.starts_with(br"?\") {
+                // \\?\
+                path = &path[2..];
+                if path.starts_with(br"UNC\") {
+                    // \\?\UNC\server\share
+                    path = &path[4..];
+                    let (server, share) = match parse_two_comps(path, is_verbatim_sep) {
+                        Some((server, share)) =>
+                            (u8_slice_as_os_str(server), u8_slice_as_os_str(share)),
+                        None => (u8_slice_as_os_str(path), u8_slice_as_os_str(&[])),
+                    };
+                    return Some(VerbatimUNC(server, share));
+                } else {
+                    // \\?\path
+                    let idx = path.iter().position(|&b| b == b'\\');
+                    if idx == Some(2) && path[1] == b':' {
+                        let c = path[0];
+                        if c.is_ascii() && (c as char).is_alphabetic() {
+                            // \\?\C:\ path
+                            return Some(VerbatimDisk(c.to_ascii_uppercase()));
+                        }
+                    }
+                    let slice = &path[..idx.unwrap_or(path.len())];
+                    return Some(Verbatim(u8_slice_as_os_str(slice)));
+                }
+            } else if path.starts_with(b".\\") {
+                // \\.\path
+                path = &path[2..];
+                let pos = path.iter().position(|&b| b == b'\\');
+                let slice = &path[..pos.unwrap_or(path.len())];
+                return Some(DeviceNS(u8_slice_as_os_str(slice)));
+            }
+            match parse_two_comps(path, is_sep_byte) {
+                Some((server, share)) if !server.is_empty() && !share.is_empty() => {
+                    // \\server\share
+                    return Some(UNC(u8_slice_as_os_str(server), u8_slice_as_os_str(share)));
+                }
+                _ => (),
+            }
+        } else if path.get(1) == Some(& b':') {
+            // C:
+            let c = path[0];
+            if c.is_ascii() && (c as char).is_alphabetic() {
+                return Some(Disk(c.to_ascii_uppercase()));
+            }
+        }
+        return None;
+    }
+
+    fn parse_two_comps(mut path: &[u8], f: fn(u8) -> bool) -> Option<(&[u8], &[u8])> {
+        let first = match path.iter().position(|x| f(*x)) {
+            None => return None,
+            Some(x) => &path[..x],
+        };
+        path = &path[(first.len() + 1)..];
+        let idx = path.iter().position(|x| f(*x));
+        let second = &path[..idx.unwrap_or(path.len())];
+        Some((first, second))
+    }
+}
+
+pub const MAIN_SEP_STR: &'static str = "\\";
+pub const MAIN_SEP: char = '\\';