core: Change the argument order on splitn and rsplitn for strs.

This makes it consistent with the same functions for slices,
and allows the search closure to be specified last.

[breaking-change]

src/compiletest/header.rs

@@ -233,7 +233,7 @@ fn parse_exec_env(line: &str) -> Option<(String, String)> {
     parse_name_value_directive(line, "exec-env").map(|nv| {
         // nv is either FOO or FOO=BAR
         let mut strs: Vec<String> = nv.as_slice()
-                                      .splitn('=', 1)
+                                      .splitn(1, '=')
                                       .map(|s| s.to_string())
                                       .collect();
 

src/libcore/str.rs

@@ -1147,22 +1147,22 @@ pub trait StrSlice<'a> {
     /// # Example
     ///
     /// ```rust
-    /// let v: Vec<&str> = "Mary had a little lambda".splitn(' ', 2).collect();
+    /// let v: Vec<&str> = "Mary had a little lambda".splitn(2, ' ').collect();
     /// assert_eq!(v, vec!["Mary", "had", "a little lambda"]);
     ///
-    /// let v: Vec<&str> = "abc1def2ghi".splitn(|c: char| c.is_digit(), 1).collect();
+    /// let v: Vec<&str> = "abc1def2ghi".splitn(1, |c: char| c.is_digit()).collect();
     /// assert_eq!(v, vec!["abc", "def2ghi"]);
     ///
-    /// let v: Vec<&str> = "lionXXtigerXleopard".splitn('X', 2).collect();
+    /// let v: Vec<&str> = "lionXXtigerXleopard".splitn(2, 'X').collect();
     /// assert_eq!(v, vec!["lion", "", "tigerXleopard"]);
     ///
-    /// let v: Vec<&str> = "abcXdef".splitn('X', 0).collect();
+    /// let v: Vec<&str> = "abcXdef".splitn(0, 'X').collect();
     /// assert_eq!(v, vec!["abcXdef"]);
     ///
-    /// let v: Vec<&str> = "".splitn('X', 1).collect();
+    /// let v: Vec<&str> = "".splitn(1, 'X').collect();
     /// assert_eq!(v, vec![""]);
     /// ```
-    fn splitn<Sep: CharEq>(&self, sep: Sep, count: uint) -> CharSplitsN<'a, Sep>;
+    fn splitn<Sep: CharEq>(&self, count: uint, sep: Sep) -> CharSplitsN<'a, Sep>;
 
     /// An iterator over substrings of `self`, separated by characters
     /// matched by `sep`.
@@ -1197,16 +1197,16 @@ pub trait StrSlice<'a> {
     /// # Example
     ///
     /// ```rust
-    /// let v: Vec<&str> = "Mary had a little lamb".rsplitn(' ', 2).collect();
+    /// let v: Vec<&str> = "Mary had a little lamb".rsplitn(2, ' ').collect();
     /// assert_eq!(v, vec!["lamb", "little", "Mary had a"]);
     ///
-    /// let v: Vec<&str> = "abc1def2ghi".rsplitn(|c: char| c.is_digit(), 1).collect();
+    /// let v: Vec<&str> = "abc1def2ghi".rsplitn(1, |c: char| c.is_digit()).collect();
     /// assert_eq!(v, vec!["ghi", "abc1def"]);
     ///
-    /// let v: Vec<&str> = "lionXXtigerXleopard".rsplitn('X', 2).collect();
+    /// let v: Vec<&str> = "lionXXtigerXleopard".rsplitn(2, 'X').collect();
     /// assert_eq!(v, vec!["leopard", "tiger", "lionX"]);
     /// ```
-    fn rsplitn<Sep: CharEq>(&self, sep: Sep, count: uint) -> CharSplitsN<'a, Sep>;
+    fn rsplitn<Sep: CharEq>(&self, count: uint, sep: Sep) -> CharSplitsN<'a, Sep>;
 
     /// An iterator over the start and end indices of the disjoint
     /// matches of `sep` within `self`.
@@ -1697,7 +1697,7 @@ fn split<Sep: CharEq>(&self, sep: Sep) -> CharSplits<'a, Sep> {
     }
 
     #[inline]
-    fn splitn<Sep: CharEq>(&self, sep: Sep, count: uint)
+    fn splitn<Sep: CharEq>(&self, count: uint, sep: Sep)
         -> CharSplitsN<'a, Sep> {
         CharSplitsN {
             iter: self.split(sep),
@@ -1716,7 +1716,7 @@ fn split_terminator<Sep: CharEq>(&self, sep: Sep)
     }
 
     #[inline]
-    fn rsplitn<Sep: CharEq>(&self, sep: Sep, count: uint)
+    fn rsplitn<Sep: CharEq>(&self, count: uint, sep: Sep)
         -> CharSplitsN<'a, Sep> {
         CharSplitsN {
             iter: self.split(sep),

src/libnum/rational.rs

@@ -341,7 +341,7 @@ impl<T: FromStr + Clone + Integer + PartialOrd>
     FromStr for Ratio<T> {
     /// Parses `numer/denom` or just `numer`.
     fn from_str(s: &str) -> Option<Ratio<T>> {
-        let mut split = s.splitn('/', 1);
+        let mut split = s.splitn(1, '/');
 
         let num = split.next().and_then(|n| FromStr::from_str(n));
         let den = split.next().or(Some("1")).and_then(|d| FromStr::from_str(d));
@@ -357,7 +357,7 @@ impl<T: FromStrRadix + Clone + Integer + PartialOrd>
     FromStrRadix for Ratio<T> {
     /// Parses `numer/denom` where the numbers are in base `radix`.
     fn from_str_radix(s: &str, radix: uint) -> Option<Ratio<T>> {
-        let split: Vec<&str> = s.splitn('/', 1).collect();
+        let split: Vec<&str> = s.splitn(1, '/').collect();
         if split.len() < 2 {
             None
         } else {

src/libregex/parse.rs

@@ -13,6 +13,7 @@
 use std::fmt;
 use std::iter;
 use std::num;
+use std::slice;
 
 /// Static data containing Unicode ranges for general categories and scripts.
 use unicode::regex::{UNICODE_CLASSES, PERLD, PERLS, PERLW};
@@ -518,7 +519,7 @@ fn parse_counted(&mut self) -> Result<(), Error> {
             min = try!(self.parse_uint(inner.as_slice()));
             max = Some(min);
         } else {
-            let pieces: Vec<&str> = inner.as_slice().splitn(',', 1).collect();
+            let pieces: Vec<&str> = inner.as_slice().splitn(1, ',').collect();
             let (smin, smax) = (pieces[0], pieces[1]);
             if smin.len() == 0 {
                 return self.err("Max repetitions cannot be specified \
@@ -1017,9 +1018,9 @@ fn is_valid_cap(c: char) -> bool {
 }
 
 fn find_class(classes: NamedClasses, name: &str) -> Option<Vec<(char, char)>> {
-    match classes.bsearch(|&(s, _)| s.cmp(&name)) {
-        Some(i) => Some(Vec::from_slice(classes[i].val1())),
-        None => None,
+    match classes.binary_search(|&(s, _)| s.cmp(&name)) {
+        slice::Found(i) => Some(Vec::from_slice(classes[i].val1())),
+        slice::NotFound(_) => None,
     }
 }
 

src/libregex/vm.rs

@@ -35,7 +35,6 @@
 
 use std::cmp;
 use std::mem;
-use std::slice;
 use std::slice::MutableSlice;
 use compile::{
     Program,

src/librustc/driver/config.rs

@@ -353,7 +353,7 @@ pub fn build_codegen_options(matches: &getopts::Matches) -> CodegenOptions
 {
     let mut cg = basic_codegen_options();
     for option in matches.opt_strs("C").move_iter() {
-        let mut iter = option.as_slice().splitn('=', 1);
+        let mut iter = option.as_slice().splitn(1, '=');
         let key = iter.next().unwrap();
         let value = iter.next();
         let option_to_lookup = key.replace("-", "_");
@@ -750,7 +750,7 @@ pub fn build_session_options(matches: &getopts::Matches) -> Options {
 
     let mut externs = HashMap::new();
     for arg in matches.opt_strs("extern").iter() {
-        let mut parts = arg.as_slice().splitn('=', 1);
+        let mut parts = arg.as_slice().splitn(1, '=');
         let name = match parts.next() {
             Some(s) => s,
             None => early_error("--extern value must not be empty"),

src/librustc/driver/mod.rs

@@ -356,7 +356,7 @@ pub enum PpMode {
 }
 
 fn parse_pretty(sess: &Session, name: &str) -> (PpMode, Option<driver::UserIdentifiedItem>) {
-    let mut split = name.splitn('=', 1);
+    let mut split = name.splitn(1, '=');
     let first = split.next().unwrap();
     let opt_second = split.next();
     let first = match first {

src/librustdoc/lib.rs

@@ -328,7 +328,7 @@ fn acquire_input(input: &str,
 fn parse_externs(matches: &getopts::Matches) -> Result<core::Externs, String> {
     let mut externs = HashMap::new();
     for arg in matches.opt_strs("extern").iter() {
-        let mut parts = arg.as_slice().splitn('=', 1);
+        let mut parts = arg.as_slice().splitn(1, '=');
         let name = match parts.next() {
             Some(s) => s,
             None => {

src/libsyntax/crateid.rs

@@ -51,7 +51,7 @@ fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 
 impl FromStr for CrateId {
     fn from_str(s: &str) -> Option<CrateId> {
-        let pieces: Vec<&str> = s.splitn('#', 1).collect();
+        let pieces: Vec<&str> = s.splitn(1, '#').collect();
         let path = pieces.get(0).to_string();
 
         if path.as_slice().starts_with("/") || path.as_slice().ends_with("/") ||
@@ -60,7 +60,7 @@ fn from_str(s: &str) -> Option<CrateId> {
         }
 
         let path_pieces: Vec<&str> = path.as_slice()
-                                         .rsplitn('/', 1)
+                                         .rsplitn(1, '/')
                                          .collect();
         let inferred_name = *path_pieces.get(0);
 
@@ -68,7 +68,7 @@ fn from_str(s: &str) -> Option<CrateId> {
             (inferred_name.to_string(), None)
         } else {
             let hash_pieces: Vec<&str> = pieces.get(1)
-                                               .splitn(':', 1)
+                                               .splitn(1, ':')
                                                .collect();
             let (hash_name, hash_version) = if hash_pieces.len() == 1 {
                 ("", *hash_pieces.get(0))

src/liburl/lib.rs

@@ -396,7 +396,7 @@ fn maybe_push_value(map: &mut HashMap<String, Vec<String>>,
 }
 
 fn split_char_first(s: &str, c: char) -> (&str, &str) {
-    let mut iter = s.splitn(c, 1);
+    let mut iter = s.splitn(1, c);
 
     match (iter.next(), iter.next()) {
         (Some(a), Some(b)) => (a, b),