1 extern crate rustc_ast; 2 extern crate rustc_expand; 3 extern crate rustc_parse as parse; 4 extern crate rustc_session; 5 extern crate rustc_span; 6 7 use rustc_ast::ast; 8 use rustc_ast::ptr::P; 9 use rustc_session::parse::ParseSess; 10 use rustc_span::source_map::FilePathMapping; 11 use rustc_span::FileName; 12 use std::panic; 13 librustc_expr(input: &str) -> Option<P<ast::Expr>>14pub fn librustc_expr(input: &str) -> Option<P<ast::Expr>> { 15 match panic::catch_unwind(|| { 16 let sess = ParseSess::new(FilePathMapping::empty()); 17 let e = parse::new_parser_from_source_str( 18 &sess, 19 FileName::Custom("test_precedence".to_string()), 20 input.to_string(), 21 ) 22 .parse_expr(); 23 match e { 24 Ok(expr) => Some(expr), 25 Err(mut diagnostic) => { 26 diagnostic.emit(); 27 None 28 } 29 } 30 }) { 31 Ok(Some(e)) => Some(e), 32 Ok(None) => None, 33 Err(_) => { 34 errorf!("librustc panicked\n"); 35 None 36 } 37 } 38 } 39 syn_expr(input: &str) -> Option<syn::Expr>40pub fn syn_expr(input: &str) -> Option<syn::Expr> { 41 match syn::parse_str(input) { 42 Ok(e) => Some(e), 43 Err(msg) => { 44 errorf!("syn failed to parse\n{:?}\n", msg); 45 None 46 } 47 } 48 } 49