auto merge of #13985 : alexcrichton/rust/libfmt, r=brson

This code does not belong in libstd, and rather belongs in a dedicated crate. In
the future, the syntax::ext::format module should move to the fmt_macros crate
(hence the name of the crate), but for now the fmt_macros crate will only
contain the format string parser.

The entire fmt_macros crate is marked #[experimental] because it is not meant
for general consumption, only the format!() interface is officially supported,
not the internals.

This is a breaking change for anyone using the internals of std::fmt::parse.
Some of the flags have moved to std::fmt::rt, while the actual parsing support
has all moved to the fmt_macros library.

[breaking-change]

2 files changed, 7 insertions, 16 deletions

diff --git a/src/libsyntax/ext/format.rs b/src/libsyntax/ext/format.rs
index 79f49b908d1..c03d174365e 100644
--- a/src/libsyntax/ext/format.rs
+++ b/src/libsyntax/ext/format.rs
@@ -18,7 +18,7 @@ use parse::token::InternedString;
 use parse::token;
 use rsparse = parse;
 
-use std::fmt::parse;
+use parse = fmt_macros;
 use collections::{HashMap, HashSet};
 
 #[deriving(Eq)]
@@ -232,7 +232,7 @@ impl<'a, 'b> Context<'a, 'b> {
                             parse::Keyword(name) => {
                                 self.ecx.span_err(self.fmtsp,
                                                   format!("duplicate selector \
-                                                           `{:?}`", name));
+                                                           `{}`", name));
                             }
                             parse::Literal(idx) => {
                                 self.ecx.span_err(self.fmtsp,
@@ -375,21 +375,11 @@ impl<'a, 'b> Context<'a, 'b> {
         return vec!(unnamed, allow_dead_code);
     }
 
-    fn parsepath(&self, s: &str) -> Vec<ast::Ident> {
-        vec!(self.ecx.ident_of("std"), self.ecx.ident_of("fmt"),
-          self.ecx.ident_of("parse"), self.ecx.ident_of(s))
-    }
-
     fn rtpath(&self, s: &str) -> Vec<ast::Ident> {
         vec!(self.ecx.ident_of("std"), self.ecx.ident_of("fmt"),
           self.ecx.ident_of("rt"), self.ecx.ident_of(s))
     }
 
-    fn ctpath(&self, s: &str) -> Vec<ast::Ident> {
-        vec!(self.ecx.ident_of("std"), self.ecx.ident_of("fmt"),
-          self.ecx.ident_of("parse"), self.ecx.ident_of(s))
-    }
-
     fn none(&self) -> @ast::Expr {
         let none = self.ecx.path_global(self.fmtsp, vec!(
                 self.ecx.ident_of("std"),
@@ -475,7 +465,7 @@ impl<'a, 'b> Context<'a, 'b> {
                             }).collect();
                         let (lr, selarg) = match arm.selector {
                             parse::Keyword(t) => {
-                                let p = self.ctpath(format!("{:?}", t));
+                                let p = self.rtpath(t.to_str());
                                 let p = self.ecx.path_global(sp, p);
                                 (self.rtpath("Keyword"), self.ecx.expr_path(p))
                             }
@@ -564,13 +554,13 @@ impl<'a, 'b> Context<'a, 'b> {
                 let fill = self.ecx.expr_lit(sp, ast::LitChar(fill));
                 let align = match arg.format.align {
                     parse::AlignLeft => {
-                        self.ecx.path_global(sp, self.parsepath("AlignLeft"))
+                        self.ecx.path_global(sp, self.rtpath("AlignLeft"))
                     }
                     parse::AlignRight => {
-                        self.ecx.path_global(sp, self.parsepath("AlignRight"))
+                        self.ecx.path_global(sp, self.rtpath("AlignRight"))
                     }
                     parse::AlignUnknown => {
-                        self.ecx.path_global(sp, self.parsepath("AlignUnknown"))
+                        self.ecx.path_global(sp, self.rtpath("AlignUnknown"))
                     }
                 };
                 let align = self.ecx.expr_path(align);
diff --git a/src/libsyntax/lib.rs b/src/libsyntax/lib.rs
index 012bc50ecab..5e1d988df5c 100644
--- a/src/libsyntax/lib.rs
+++ b/src/libsyntax/lib.rs
@@ -35,6 +35,7 @@ extern crate term;
 extern crate collections;
 #[phase(syntax, link)]
 extern crate log;
+extern crate fmt_macros;
 
 pub mod util {
     pub mod interner;