src/libsyntax/ext/log_syntax.rs

   1 // Copyright 2012 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 use ast;
  12 use codemap;
  13 use ext::base::*;
  14 use ext::base;
  15 use print;
  16
  17 pub fn expand_syntax_ext(cx: &mut ExtCtxt,
  18                          sp: codemap::Span,
  19                          tt: &[ast::TokenTree])
  20                       -> base::MacResult {
  21
  22     cx.print_backtrace();
  23     println!("{}", print::pprust::tt_to_str(&ast::TTDelim(
  24                 @tt.iter().map(|x| (*x).clone()).collect())));
  25
  26     //trivial expression
  27     MRExpr(@ast::Expr {
  28         id: ast::DUMMY_NODE_ID,
  29         node: ast::ExprLit(@codemap::Spanned {
  30             node: ast::LitNil,
  31             span: sp
  32         }),
  33         span: sp,
  34     })
  35 }