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|
use super::*;
// This test is mainly here for interactive development. Use this test while
// you're working on the proc-macro defined in this file.
#[test]
fn test_symbols() {
// We textually include the symbol.rs file, which contains the list of all
// symbols, keywords, and common words. Then we search for the
// `symbols! { ... }` call.
static SYMBOL_RS_FILE: &str = include_str!("../../../rustc_span/src/symbol.rs");
let file = syn::parse_file(SYMBOL_RS_FILE).unwrap();
let symbols_path: syn::Path = syn::parse_quote!(symbols);
let m: &syn::ItemMacro = file
.items
.iter()
.find_map(|i| {
if let syn::Item::Macro(m) = i {
if m.mac.path == symbols_path { Some(m) } else { None }
} else {
None
}
})
.expect("did not find `symbols!` macro invocation.");
let body_tokens = m.mac.tokens.clone();
test_symbols_macro(body_tokens, &[]);
}
fn test_symbols_macro(input: TokenStream, expected_errors: &[&str]) {
let (output, found_errors) = symbols_with_errors(input);
// It should always parse.
let _parsed_file = syn::parse2::<syn::File>(output).unwrap();
assert_eq!(
found_errors.len(),
expected_errors.len(),
"Macro generated a different number of errors than expected"
);
for (found_error, &expected_error) in found_errors.iter().zip(expected_errors) {
let found_error_str = format!("{}", found_error);
assert_eq!(found_error_str, expected_error);
}
}
#[test]
fn check_dup_keywords() {
let input = quote! {
Keywords {
Crate: "crate",
Crate: "crate",
}
Symbols {}
};
test_symbols_macro(input, &["Symbol `crate` is duplicated", "location of previous definition"]);
}
#[test]
fn check_dup_symbol() {
let input = quote! {
Keywords {}
Symbols {
splat,
splat,
}
};
test_symbols_macro(input, &["Symbol `splat` is duplicated", "location of previous definition"]);
}
#[test]
fn check_dup_symbol_and_keyword() {
let input = quote! {
Keywords {
Splat: "splat",
}
Symbols {
splat,
}
};
test_symbols_macro(input, &["Symbol `splat` is duplicated", "location of previous definition"]);
}
#[test]
fn check_symbol_order() {
let input = quote! {
Keywords {}
Symbols {
zebra,
aardvark,
}
};
test_symbols_macro(
input,
&["Symbol `aardvark` must precede `zebra`", "location of previous symbol `zebra`"],
);
}
|
