Implement bytes! syntax extension

1 files changed, 28 insertions, 0 deletions

diff --git a/src/libsyntax/ext/bytes.rs b/src/libsyntax/ext/bytes.rs
new file mode 100644
index 00000000000..03020f26a93
--- /dev/null
+++ b/src/libsyntax/ext/bytes.rs
@@ -0,0 +1,28 @@
+// Copyright 2013 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.
+
+/* The compiler code necessary to support the bytes! extension. */
+
+use ast;
+use codemap::span;
+use ext::base::*;
+use ext::base;
+use ext::build::{mk_u8, mk_slice_vec_e};
+
+pub fn expand_syntax_ext(cx: @ext_ctxt, sp: span, tts: &[ast::token_tree])
+    -> base::MacResult {
+    let var = get_single_str_from_tts(cx, sp, tts, "bytes!");
+    let mut bytes = ~[];
+    for var.each |byte| {
+        bytes.push(mk_u8(cx, sp, byte));
+    }
+    let e = mk_slice_vec_e(cx, sp, bytes);
+    MRExpr(e)
+}