d8a3d6f378
When dealing with proc macros, there are two very different kinds of errors: * first, usual errors of "proc macro panicked on this particular input" * second, the proc macro server might day if the user, eg, kills it First kind of errors are expected and are a normal output, while the second kind are genuine IO-errors. For this reason, we use a curious nested result here: `Result<Result<T, E1>, E2>` pattern, which is 100% inspired by http://sled.rs/errors.html
48 lines
1.9 KiB
Rust
48 lines
1.9 KiB
Rust
//! utils used in proc-macro tests
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use crate::dylib;
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use crate::ProcMacroSrv;
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use expect_test::Expect;
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use std::str::FromStr;
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pub mod fixtures {
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pub fn proc_macro_test_dylib_path() -> std::path::PathBuf {
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proc_macro_test::PROC_MACRO_TEST_LOCATION.into()
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}
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}
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fn parse_string(code: &str) -> Option<crate::abis::abi_1_47::TokenStream> {
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// This is a bit strange. We need to parse a string into a token stream into
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// order to create a tt::SubTree from it in fixtures. `into_subtree` is
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// implemented by all the ABIs we have so we arbitrarily choose one ABI to
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// write a `parse_string` function for and use that. The tests don't really
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// care which ABI we're using as the `into_subtree` function isn't part of
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// the ABI and shouldn't change between ABI versions.
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crate::abis::abi_1_47::TokenStream::from_str(code).ok()
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}
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pub fn assert_expand(macro_name: &str, ra_fixture: &str, expect: Expect) {
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assert_expand_impl(macro_name, ra_fixture, None, expect);
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}
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pub fn assert_expand_attr(macro_name: &str, ra_fixture: &str, attr_args: &str, expect: Expect) {
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assert_expand_impl(macro_name, ra_fixture, Some(attr_args), expect);
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}
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fn assert_expand_impl(macro_name: &str, input: &str, attr: Option<&str>, expect: Expect) {
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let path = fixtures::proc_macro_test_dylib_path();
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let expander = dylib::Expander::new(&path).unwrap();
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let fixture = parse_string(input).unwrap();
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let attr = attr.map(|attr| parse_string(attr).unwrap().into_subtree());
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let res = expander.expand(macro_name, &fixture.into_subtree(), attr.as_ref()).unwrap();
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expect.assert_eq(&format!("{:?}", res));
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}
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pub(crate) fn list() -> Vec<String> {
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let dylib_path = fixtures::proc_macro_test_dylib_path();
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let mut srv = ProcMacroSrv::default();
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let res = srv.list_macros(&dylib_path).unwrap();
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res.into_iter().map(|(name, kind)| format!("{} [{:?}]", name, kind)).collect()
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}
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