Review and rebasing changes

Author: Nick Cameron

src/libcollections/slice.rs

@@ -44,7 +44,8 @@
 //!
 //! A number of traits add methods that allow you to accomplish tasks with slices.
 //! These traits include `ImmutableSlice`, which is defined for `&[T]` types,
-//! and `MutableSlice`, defined for `&mut [T]` types.
+//! `MutableSlice`, defined for `&mut [T]` types, and `Slice` and `SliceMut`
+//! which are defined for `[T]`.
 //!
 //! An example is the `slice` method which enables slicing syntax `[a..b]` that
 //! returns an immutable "view" into a `Vec` or another slice from the index

src/libcollections/string.rs

@@ -927,6 +927,7 @@ impl<S: Str> Add<S, String> for String {
     }
 }
 
+#[cfg(stage0)]
 impl ops::Slice<uint, str> for String {
     #[inline]
     fn as_slice_<'a>(&'a self) -> &'a str {
@@ -949,6 +950,34 @@ impl ops::Slice<uint, str> for String {
     }
 }
 
+#[cfg(not(stage0))]
+#[inline]
+fn str_to_slice<'a, U: Str>(this: &'a U) -> &'a str {
+    this.as_slice()
+}
+#[cfg(not(stage0))]
+impl ops::Slice<uint, str> for String {
+    #[inline]
+    fn as_slice<'a>(&'a self) -> &'a str {
+        str_to_slice(self)
+    }
+
+    #[inline]
+    fn slice_from<'a>(&'a self, from: &uint) -> &'a str {
+        self[][*from..]
+    }
+
+    #[inline]
+    fn slice_to<'a>(&'a self, to: &uint) -> &'a str {
+        self[][..*to]
+    }
+
+    #[inline]
+    fn slice<'a>(&'a self, from: &uint, to: &uint) -> &'a str {
+        self[][*from..*to]
+    }
+}
+
 /// Unsafe operations
 #[unstable = "waiting on raw module conventions"]
 pub mod raw {

src/libcollections/vec.rs

@@ -462,6 +462,7 @@ impl<T> Index<uint,T> for Vec<T> {
 
 // Annoying helper function because there are two Slice::as_slice functions in
 // scope.
+#[cfg(not(stage0))]
 #[inline]
 fn slice_to_slice<'a, T, U: Slice<T>>(this: &'a U) -> &'a [T] {
     this.as_slice()
@@ -983,7 +984,6 @@ impl<T> Vec<T> {
     /// assert!(vec[0..2] == [1, 2]);
     /// ```
     #[inline]
-    #[deprecated = "use slicing syntax"]
     pub fn slice<'a>(&'a self, start: uint, end: uint) -> &'a [T] {
         self[start..end]
     }
@@ -1019,7 +1019,7 @@ impl<T> Vec<T> {
     /// assert!(vec.tailn(2) == [3, 4]);
     /// ```
     #[inline]
-    #[deprecated = "use slicing syntax"]
+    #[deprecated = "use slice_from"]
     pub fn tailn<'a>(&'a self, n: uint) -> &'a [T] {
         self[n..]
     }
@@ -1229,7 +1229,7 @@ impl<T> Vec<T> {
     }
 
     /// Deprecated: use `slice_mut`.
-    #[deprecated = "use slicing syntax"]
+    #[deprecated = "use slice_from"]
     pub fn mut_slice<'a>(&'a mut self, start: uint, end: uint)
                          -> &'a mut [T] {
         self[mut start..end]
@@ -1249,14 +1249,13 @@ impl<T> Vec<T> {
     /// assert!(vec[mut 0..2] == [1, 2]);
     /// ```
     #[inline]
-    #[deprecated = "use slicing syntax"]
     pub fn slice_mut<'a>(&'a mut self, start: uint, end: uint)
                          -> &'a mut [T] {
         self[mut start..end]
     }
 
     /// Deprecated: use "slice_from_mut".
-    #[deprecated = "use slicing syntax"]
+    #[deprecated = "use slice_from_mut"]
     pub fn mut_slice_from<'a>(&'a mut self, start: uint) -> &'a mut [T] {
         self[mut start..]
     }
@@ -1274,13 +1273,12 @@ impl<T> Vec<T> {
     /// assert!(vec[mut 2..] == [3, 4]);
     /// ```
     #[inline]
-    #[deprecated = "use slicing syntax"]
     pub fn slice_from_mut<'a>(&'a mut self, start: uint) -> &'a mut [T] {
         self[mut start..]
     }
 
     /// Deprecated: use `slice_to_mut`.
-    #[deprecated = "use slicing syntax"]
+    #[deprecated = "use slice_to_mut"]
     pub fn mut_slice_to<'a>(&'a mut self, end: uint) -> &'a mut [T] {
         self[mut ..end]
     }
@@ -1298,7 +1296,6 @@ impl<T> Vec<T> {
     /// assert!(vec[mut ..2] == [1, 2]);
     /// ```
     #[inline]
-    #[deprecated = "use slicing syntax"]
     pub fn slice_to_mut<'a>(&'a mut self, end: uint) -> &'a mut [T] {
         self[mut ..end]
     }
@@ -1375,7 +1372,6 @@ impl<T> Vec<T> {
     /// assert!(vec[1..] == [2, 3]);
     /// ```
     #[inline]
-    #[deprecated = "use slicing syntax"]
     pub fn slice_from<'a>(&'a self, start: uint) -> &'a [T] {
         self[start..]
     }
@@ -1393,7 +1389,6 @@ impl<T> Vec<T> {
     /// assert!(vec[..2] == [1, 2]);
     /// ```
     #[inline]
-    #[deprecated = "use slicing syntax"]
     pub fn slice_to<'a>(&'a self, end: uint) -> &'a [T] {
         self[..end]
     }

src/libcore/slice.rs

@@ -152,7 +152,7 @@ pub trait ImmutableSlice<'a, T> {
     fn tail(&self) -> &'a [T];
 
     /// Returns all but the first `n' elements of a slice.
-    #[deprecated = "use slicing syntax"]
+    #[deprecated = "use slice_from"]
     fn tailn(&self, n: uint) -> &'a [T];
 
     /// Returns all but the last element of a slice.
@@ -161,7 +161,6 @@ pub trait ImmutableSlice<'a, T> {
 
     /// Returns all but the last `n' elements of a slice.
     #[deprecated = "use slice_to but note the arguments are different"]
-    #[deprecated = "use slicing syntax, but note the arguments are different"]
     fn initn(&self, n: uint) -> &'a [T];
 
     /// Returns the last element of a slice, or `None` if it is empty.
@@ -321,7 +320,7 @@ impl<'a,T> ImmutableSlice<'a, T> for &'a [T] {
     fn tail(&self) -> &'a [T] { (*self)[1..] }
 
     #[inline]
-    #[deprecated = "use slicing syntax"]
+    #[deprecated = "use slice_from"]
     fn tailn(&self, n: uint) -> &'a [T] { (*self)[n..] }
 
     #[inline]
@@ -330,7 +329,7 @@ impl<'a,T> ImmutableSlice<'a, T> for &'a [T] {
     }
 
     #[inline]
-    #[deprecated = "use slicing syntax but note the arguments are different"]
+    #[deprecated = "use slice_to but note the arguments are different"]
     fn initn(&self, n: uint) -> &'a [T] {
         (*self)[..self.len() - n]
     }
@@ -543,7 +542,6 @@ pub trait MutableSlice<'a, T> {
     fn get_mut(self, index: uint) -> Option<&'a mut T>;
     /// Work with `self` as a mut slice.
     /// Primarily intended for getting a &mut [T] from a [T, ..N].
-    #[deprecated = "use slicing syntax"]
     fn as_mut_slice(self) -> &'a mut [T];
 
     /// Deprecated: use `iter_mut`.

src/libcore/str.rs

@@ -1164,6 +1164,7 @@ pub mod traits {
         fn equiv(&self, other: &S) -> bool { eq_slice(*self, other.as_slice()) }
     }
 
+    #[cfg(stage0)]
     impl ops::Slice<uint, str> for str {
         #[inline]
         fn as_slice_<'a>(&'a self) -> &'a str {
@@ -1172,17 +1173,39 @@ pub mod traits {
 
         #[inline]
         fn slice_from_<'a>(&'a self, from: &uint) -> &'a str {
-            self.slice_from(*from)
+            super::slice_from_impl(&self, *from)
         }
 
         #[inline]
         fn slice_to_<'a>(&'a self, to: &uint) -> &'a str {
-            self.slice_to(*to)
+            super::slice_to_impl(&self, *to)
         }
 
         #[inline]
         fn slice_<'a>(&'a self, from: &uint, to: &uint) -> &'a str {
-            self.slice(*from, *to)
+            super::slice_impl(&self, *from, *to)
+        }
+    }
+    #[cfg(not(stage0))]
+    impl ops::Slice<uint, str> for str {
+        #[inline]
+        fn as_slice<'a>(&'a self) -> &'a str {
+            self
+        }
+
+        #[inline]
+        fn slice_from<'a>(&'a self, from: &uint) -> &'a str {
+            super::slice_from_impl(&self, *from)
+        }
+
+        #[inline]
+        fn slice_to<'a>(&'a self, to: &uint) -> &'a str {
+            super::slice_to_impl(&self, *to)
+        }
+
+        #[inline]
+        fn slice<'a>(&'a self, from: &uint, to: &uint) -> &'a str {
+            super::slice_impl(&self, *from, *to)
         }
     }
 }
@@ -1835,6 +1858,38 @@ fn slice_error_fail(s: &str, begin: uint, end: uint) -> ! {
           begin, end, s);
 }
 
+#[inline]
+fn slice_impl<'a>(this: &&'a str, begin: uint, end: uint) -> &'a str {
+    // is_char_boundary checks that the index is in [0, .len()]
+    if begin <= end &&
+       this.is_char_boundary(begin) &&
+       this.is_char_boundary(end) {
+        unsafe { raw::slice_unchecked(*this, begin, end) }
+    } else {
+        slice_error_fail(*this, begin, end)
+    }
+}
+
+#[inline]
+fn slice_from_impl<'a>(this: &&'a str, begin: uint) -> &'a str {
+    // is_char_boundary checks that the index is in [0, .len()]
+    if this.is_char_boundary(begin) {
+        unsafe { raw::slice_unchecked(*this, begin, this.len()) }
+    } else {
+        slice_error_fail(*this, begin, this.len())
+    }
+}
+
+#[inline]
+fn slice_to_impl<'a>(this: &&'a str, end: uint) -> &'a str {
+    // is_char_boundary checks that the index is in [0, .len()]
+    if this.is_char_boundary(end) {
+        unsafe { raw::slice_unchecked(*this, 0, end) }
+    } else {
+        slice_error_fail(*this, 0, end)
+    }
+}
+
 impl<'a> StrSlice<'a> for &'a str {
     #[inline]
     fn contains<'a>(&self, needle: &'a str) -> bool {
@@ -1938,34 +1993,17 @@ impl<'a> StrSlice<'a> for &'a str {
 
     #[inline]
     fn slice(&self, begin: uint, end: uint) -> &'a str {
-        // is_char_boundary checks that the index is in [0, .len()]
-        if begin <= end &&
-           self.is_char_boundary(begin) &&
-           self.is_char_boundary(end) {
-            unsafe { raw::slice_unchecked(*self, begin, end) }
-        } else {
-            slice_error_fail(*self, begin, end)
-        }
+        slice_impl(self, begin, end)
     }
 
     #[inline]
     fn slice_from(&self, begin: uint) -> &'a str {
-        // is_char_boundary checks that the index is in [0, .len()]
-        if self.is_char_boundary(begin) {
-            unsafe { raw::slice_unchecked(*self, begin, self.len()) }
-        } else {
-            slice_error_fail(*self, begin, self.len())
-        }
+        slice_from_impl(self, begin)
     }
 
     #[inline]
     fn slice_to(&self, end: uint) -> &'a str {
-        // is_char_boundary checks that the index is in [0, .len()]
-        if self.is_char_boundary(end) {
-            unsafe { raw::slice_unchecked(*self, 0, end) }
-        } else {
-            slice_error_fail(*self, 0, end)
-        }
+        slice_to_impl(self, end)
     }
 
     fn slice_chars(&self, begin: uint, end: uint) -> &'a str {

src/libnative/io/pipe_windows.rs

@@ -448,7 +448,7 @@ impl rtio::RtioPipe for UnixStream {
             }
             let ret = unsafe {
                 libc::WriteFile(self.handle(),
-                                buf.slice_from(offset).as_ptr() as libc::LPVOID,
+                                buf[offset..].as_ptr() as libc::LPVOID,
                                 (buf.len() - offset) as libc::DWORD,
                                 &mut bytes_written,
                                 &mut overlapped)

src/libstd/os.rs

@@ -144,7 +144,7 @@ pub mod windows {
     use option::{None, Option};
     use option;
     use os::TMPBUF_SZ;
-    use slice::{MutableSlice, ImmutableSlice};
+    use slice::MutableSlice;
     use string::String;
     use str::StrSlice;
     use vec::Vec;

src/libstd/rt/backtrace.rs

@@ -999,7 +999,7 @@ mod imp {
                 let bytes = cstr.as_bytes();
                 match cstr.as_str() {
                     Some(s) => try!(super::demangle(w, s)),
-                    None => try!(w.write(bytes.slice_to(bytes.len() - 1))),
+                    None => try!(w.write(bytes[..bytes.len()-1])),
                 }
             }
             try!(w.write(['\n' as u8]));