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1 | // Copyright 2016 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 | //! Parsing utilities for writing procedural macros. | |
12 | ||
13 | extern crate syntax; | |
14 | ||
15 | use syntax::parse::{ParseSess, filemap_to_tts}; | |
16 | use syntax::tokenstream::TokenStream; | |
17 | ||
476ff2be | 18 | /// Map a string to tts, using a made-up filename. For example, `lex("15")` will return a |
9e0c209e SL |
19 | /// TokenStream containing the literal 15. |
20 | pub fn lex(source_str: &str) -> TokenStream { | |
21 | let ps = ParseSess::new(); | |
22 | TokenStream::from_tts(filemap_to_tts(&ps, | |
476ff2be | 23 | ps.codemap().new_filemap("<procmacro_lex>".to_string(), |
9e0c209e SL |
24 | None, |
25 | source_str.to_owned()))) | |
26 | } |