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extern crate proc_macro2;
extern crate syn;
extern crate syntax;
extern crate syntax_pos;
use self::syntax::ast;
use self::syntax::parse::{self, ParseSess};
use self::syntax::ptr::P;
use self::syntax::source_map::FilePathMapping;
use self::syntax_pos::FileName;
use std::panic;
pub fn libsyntax_expr(input: &str) -> Option<P<ast::Expr>> {
match panic::catch_unwind(|| {
let sess = ParseSess::new(FilePathMapping::empty());
sess.span_diagnostic.set_continue_after_error(false);
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
}
}
}
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