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extern crate rustc_ast;
extern crate rustc_driver;
extern crate rustc_expand;
extern crate rustc_parse as parse;
extern crate rustc_session;
extern crate rustc_span;
use rustc_ast::ast;
use rustc_ast::ptr::P;
use rustc_session::parse::ParseSess;
use rustc_span::source_map::FilePathMapping;
use rustc_span::FileName;
use std::panic;
pub fn librustc_expr(input: &str) -> Option<P<ast::Expr>> {
match panic::catch_unwind(|| {
let locale_resources = rustc_driver::DEFAULT_LOCALE_RESOURCES.to_vec();
let file_path_mapping = FilePathMapping::empty();
let sess = ParseSess::new(locale_resources, file_path_mapping);
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!("librustc 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
}
}
}