| extern crate rustc_expand; |
| extern crate rustc_parse as parse; |
| extern crate rustc_session; |
| extern crate rustc_span; |
| extern crate syntax; |
| |
| use rustc_session::parse::ParseSess; |
| use rustc_span::source_map::FilePathMapping; |
| use rustc_span::FileName; |
| use syntax::ast; |
| use syntax::ptr::P; |
| |
| use std::panic; |
| |
| pub fn libsyntax_expr(input: &str) -> Option<P<ast::Expr>> { |
| match panic::catch_unwind(|| { |
| let sess = ParseSess::new(FilePathMapping::empty()); |
| let e = parse::new_parser_from_source_str( |
| &sess, |
| FileName::Custom("test_precedence".to_string()), |
| input.to_string(), |
| ) |
| .parse_expr(); |
| match e { |
| Ok(expr) => Some(expr), |
| Err(mut diagnostic) => { |
| diagnostic.emit(); |
| None |
| } |
| } |
| }) { |
| Ok(Some(e)) => Some(e), |
| Ok(None) => None, |
| Err(_) => { |
| errorf!("libsyntax panicked\n"); |
| None |
| } |
| } |
| } |
| |
| pub fn syn_expr(input: &str) -> Option<syn::Expr> { |
| match syn::parse_str(input) { |
| Ok(e) => Some(e), |
| Err(msg) => { |
| errorf!("syn failed to parse\n{:?}\n", msg); |
| None |
| } |
| } |
| } |