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Move some tests from rustc_expand to rustc_parse.

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There are some test cases involving `parse` and `tokenstream` and
`mut_visit` that are located in `rustc_expand`. Because it used to be
the case that constructing a `ParseSess` required the involvement of
`rustc_expand`. However, since #64197 merged (a long time ago)
`rust_expand` no longer needs to be involved.

This commit moves the tests into `rustc_parse`. This is the optimal
place for the `parse` tests. It's not ideal for the `tokenstream` and
`mut_visit` tests -- they would be better in `rustc_ast` -- but they
still rely on parsing, which is not available in `rustc_ast`. But
`rustc_parse` is lower down in the crate graph and closer to `rustc_ast`
than `rust_expand`, so it's still an improvement for them.

The exact renaming is as follows:

- rustc_expand/src/mut_visit/tests.rs -> rustc_parse/src/parser/mut_visit/tests.rs
- rustc_expand/src/tokenstream/tests.rs -> rustc_parse/src/parser/tokenstream/tests.rs
- rustc_expand/src/tests.rs + rustc_expand/src/parse/tests.rs ->
  compiler/rustc_parse/src/parser/tests.rs

The latter two test files are combined because there's no need for them
to be separate, and having a `rustc_parse::parser::parse` module would
be weird. This also means some `pub(crate)`s can be removed.
This commit is contained in:
Nicholas Nethercote 2024-05-03 09:26:34 +10:00
parent 9c9b568792
commit 2acbe9c743
9 changed files with 405 additions and 425 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
Cargo.lock
View File

@ -3976,7 +3976,6 @@ dependencies = [
"rustc_session", "rustc_session",
"rustc_span", "rustc_span",
"smallvec", "smallvec",
"termcolor",
"thin-vec", "thin-vec",
"tracing", "tracing",
] ]
@ -4464,6 +4463,7 @@ dependencies = [
"rustc_macros", "rustc_macros",
"rustc_session", "rustc_session",
"rustc_span", "rustc_span",
"termcolor",
"thin-vec", "thin-vec",
"tracing", "tracing",
"unicode-normalization", "unicode-normalization",

1
compiler/rustc_expand/Cargo.toml
View File

@ -25,7 +25,6 @@ rustc_serialize = { path = "../rustc_serialize" }
rustc_session = { path = "../rustc_session" } rustc_session = { path = "../rustc_session" }
rustc_span = { path = "../rustc_span" } rustc_span = { path = "../rustc_span" }
smallvec = { version = "1.8.1", features = ["union", "may_dangle"] } smallvec = { version = "1.8.1", features = ["union", "may_dangle"] }
termcolor = "1.2"
thin-vec = "0.2.12" thin-vec = "0.2.12"
tracing = "0.1" tracing = "0.1"
# tidy-alphabetical-end # tidy-alphabetical-end

20
compiler/rustc_expand/src/lib.rs
View File

@ -34,24 +34,4 @@ pub mod module;
#[allow(rustc::untranslatable_diagnostic)] #[allow(rustc::untranslatable_diagnostic)]
pub mod proc_macro; pub mod proc_macro;
// HACK(Centril, #64197): These shouldn't really be here.
// Rather, they should be with their respective modules which are defined in other crates.
// However, since for now constructing a `ParseSess` sorta requires `config` from this crate,
// these tests will need to live here in the interim.
#[cfg(test)]
mod tests;
#[cfg(test)]
mod parse {
mod tests;
}
#[cfg(test)]
mod tokenstream {
mod tests;
}
#[cfg(test)]
mod mut_visit {
mod tests;
}
rustc_fluent_macro::fluent_messages! { "../messages.ftl" } rustc_fluent_macro::fluent_messages! { "../messages.ftl" }

382
compiler/rustc_expand/src/parse/tests.rs
View File

@ -1,382 +0,0 @@
use crate::tests::{
matches_codepattern, psess, string_to_stream, with_error_checking_parse,
with_expected_parse_error,
};
use ast::token::IdentIsRaw;
use rustc_ast::ptr::P;
use rustc_ast::token::{self, Delimiter, Token};
use rustc_ast::tokenstream::{DelimSpacing, DelimSpan, Spacing, TokenStream, TokenTree};
use rustc_ast::visit;
use rustc_ast::{self as ast, PatKind};
use rustc_ast_pretty::pprust::item_to_string;
use rustc_errors::PResult;
use rustc_parse::new_parser_from_source_str;
use rustc_parse::parser::ForceCollect;
use rustc_session::parse::ParseSess;
use rustc_span::create_default_session_globals_then;
use rustc_span::symbol::{kw, sym, Symbol};
use rustc_span::{BytePos, FileName, Pos, Span};
use std::path::PathBuf;
/// Parses an item.
///
/// Returns `Ok(Some(item))` when successful, `Ok(None)` when no item was found, and `Err`
/// when a syntax error occurred.
fn parse_item_from_source_str(
name: FileName,
source: String,
psess: &ParseSess,
) -> PResult<'_, Option<P<ast::Item>>> {
new_parser_from_source_str(psess, name, source).parse_item(ForceCollect::No)
}
// Produces a `rustc_span::span`.
fn sp(a: u32, b: u32) -> Span {
Span::with_root_ctxt(BytePos(a), BytePos(b))
}
/// Parses a string, return an expression.
fn string_to_expr(source_str: String) -> P<ast::Expr> {
with_error_checking_parse(source_str, &psess(), |p| p.parse_expr())
}
/// Parses a string, returns an item.
fn string_to_item(source_str: String) -> Option<P<ast::Item>> {
with_error_checking_parse(source_str, &psess(), |p| p.parse_item(ForceCollect::No))
}
#[test]
fn bad_path_expr_1() {
// This should trigger error: expected identifier, found keyword `return`
create_default_session_globals_then(|| {
with_expected_parse_error(
"::abc::def::return",
"expected identifier, found keyword `return`",
|p| p.parse_expr(),
);
})
}
// Checks the token-tree-ization of macros.
#[test]
fn string_to_tts_macro() {
create_default_session_globals_then(|| {
let stream = string_to_stream("macro_rules! zip (($a)=>($a))".to_string());
let tts = &stream.trees().collect::<Vec<_>>()[..];
match tts {
[
TokenTree::Token(
Token { kind: token::Ident(name_macro_rules, IdentIsRaw::No), .. },
_,
),
TokenTree::Token(Token { kind: token::Not, .. }, _),
TokenTree::Token(Token { kind: token::Ident(name_zip, IdentIsRaw::No), .. }, _),
TokenTree::Delimited(.., macro_delim, macro_tts),
] if name_macro_rules == &kw::MacroRules && name_zip.as_str() == "zip" => {
let tts = &macro_tts.trees().collect::<Vec<_>>();
match &tts[..] {
[
TokenTree::Delimited(.., first_delim, first_tts),
TokenTree::Token(Token { kind: token::FatArrow, .. }, _),
TokenTree::Delimited(.., second_delim, second_tts),
] if macro_delim == &Delimiter::Parenthesis => {
let tts = &first_tts.trees().collect::<Vec<_>>();
match &tts[..] {
[
TokenTree::Token(Token { kind: token::Dollar, .. }, _),
TokenTree::Token(
Token { kind: token::Ident(name, IdentIsRaw::No), .. },
_,
),
] if first_delim == &Delimiter::Parenthesis && name.as_str() == "a" => {
}
_ => panic!("value 3: {:?} {:?}", first_delim, first_tts),
}
let tts = &second_tts.trees().collect::<Vec<_>>();
match &tts[..] {
[
TokenTree::Token(Token { kind: token::Dollar, .. }, _),
TokenTree::Token(
Token { kind: token::Ident(name, IdentIsRaw::No), .. },
_,
),
] if second_delim == &Delimiter::Parenthesis
&& name.as_str() == "a" => {}
_ => panic!("value 4: {:?} {:?}", second_delim, second_tts),
}
}
_ => panic!("value 2: {:?} {:?}", macro_delim, macro_tts),
}
}
_ => panic!("value: {:?}", tts),
}
})
}
#[test]
fn string_to_tts_1() {
create_default_session_globals_then(|| {
let tts = string_to_stream("fn a(b: i32) { b; }".to_string());
let expected = TokenStream::new(vec![
TokenTree::token_alone(token::Ident(kw::Fn, IdentIsRaw::No), sp(0, 2)),
TokenTree::token_joint_hidden(
token::Ident(Symbol::intern("a"), IdentIsRaw::No),
sp(3, 4),
),
TokenTree::Delimited(
DelimSpan::from_pair(sp(4, 5), sp(11, 12)),
// `JointHidden` because the `(` is followed immediately by
// `b`, `Alone` because the `)` is followed by whitespace.
DelimSpacing::new(Spacing::JointHidden, Spacing::Alone),
Delimiter::Parenthesis,
TokenStream::new(vec![
TokenTree::token_joint(
token::Ident(Symbol::intern("b"), IdentIsRaw::No),
sp(5, 6),
),
TokenTree::token_alone(token::Colon, sp(6, 7)),
// `JointHidden` because the `i32` is immediately followed by the `)`.
TokenTree::token_joint_hidden(
token::Ident(sym::i32, IdentIsRaw::No),
sp(8, 11),
),
])
.into(),
),
TokenTree::Delimited(
DelimSpan::from_pair(sp(13, 14), sp(18, 19)),
// First `Alone` because the `{` is followed by whitespace,
// second `Alone` because the `}` is followed immediately by
// EOF.
DelimSpacing::new(Spacing::Alone, Spacing::Alone),
Delimiter::Brace,
TokenStream::new(vec![
TokenTree::token_joint(
token::Ident(Symbol::intern("b"), IdentIsRaw::No),
sp(15, 16),
),
// `Alone` because the `;` is followed by whitespace.
TokenTree::token_alone(token::Semi, sp(16, 17)),
])
.into(),
),
]);
assert_eq!(tts, expected);
})
}
#[test]
fn parse_use() {
create_default_session_globals_then(|| {
let use_s = "use foo::bar::baz;";
let vitem = string_to_item(use_s.to_string()).unwrap();
let vitem_s = item_to_string(&vitem);
assert_eq!(&vitem_s[..], use_s);
let use_s = "use foo::bar as baz;";
let vitem = string_to_item(use_s.to_string()).unwrap();
let vitem_s = item_to_string(&vitem);
assert_eq!(&vitem_s[..], use_s);
})
}
#[test]
fn parse_extern_crate() {
create_default_session_globals_then(|| {
let ex_s = "extern crate foo;";
let vitem = string_to_item(ex_s.to_string()).unwrap();
let vitem_s = item_to_string(&vitem);
assert_eq!(&vitem_s[..], ex_s);
let ex_s = "extern crate foo as bar;";
let vitem = string_to_item(ex_s.to_string()).unwrap();
let vitem_s = item_to_string(&vitem);
assert_eq!(&vitem_s[..], ex_s);
})
}
fn get_spans_of_pat_idents(src: &str) -> Vec<Span> {
let item = string_to_item(src.to_string()).unwrap();
struct PatIdentVisitor {
spans: Vec<Span>,
}
impl<'a> visit::Visitor<'a> for PatIdentVisitor {
fn visit_pat(&mut self, p: &'a ast::Pat) {
match &p.kind {
PatKind::Ident(_, ident, _) => {
self.spans.push(ident.span);
}
_ => {
visit::walk_pat(self, p);
}
}
}
}
let mut v = PatIdentVisitor { spans: Vec::new() };
visit::walk_item(&mut v, &item);
return v.spans;
}
#[test]
fn span_of_self_arg_pat_idents_are_correct() {
create_default_session_globals_then(|| {
let srcs = [
"impl z { fn a (&self, &myarg: i32) {} }",
"impl z { fn a (&mut self, &myarg: i32) {} }",
"impl z { fn a (&'a self, &myarg: i32) {} }",
"impl z { fn a (self, &myarg: i32) {} }",
"impl z { fn a (self: Foo, &myarg: i32) {} }",
];
for src in srcs {
let spans = get_spans_of_pat_idents(src);
let (lo, hi) = (spans[0].lo(), spans[0].hi());
assert!(
"self" == &src[lo.to_usize()..hi.to_usize()],
"\"{}\" != \"self\". src=\"{}\"",
&src[lo.to_usize()..hi.to_usize()],
src
)
}
})
}
#[test]
fn parse_exprs() {
create_default_session_globals_then(|| {
// just make sure that they parse....
string_to_expr("3 + 4".to_string());
string_to_expr("a::z.froob(b,&(987+3))".to_string());
})
}
#[test]
fn attrs_fix_bug() {
create_default_session_globals_then(|| {
string_to_item(
"pub fn mk_file_writer(path: &Path, flags: &[FileFlag])
-> Result<Box<Writer>, String> {
#[cfg(windows)]
fn wb() -> c_int {
(O_WRONLY | libc::consts::os::extra::O_BINARY) as c_int
}
#[cfg(unix)]
fn wb() -> c_int { O_WRONLY as c_int }
let mut fflags: c_int = wb();
}"
.to_string(),
);
})
}
#[test]
fn crlf_doc_comments() {
create_default_session_globals_then(|| {
let psess = psess();
let name_1 = FileName::Custom("crlf_source_1".to_string());
let source = "/// doc comment\r\nfn foo() {}".to_string();
let item = parse_item_from_source_str(name_1, source, &psess).unwrap().unwrap();
let doc = item.attrs.iter().filter_map(|at| at.doc_str()).next().unwrap();
assert_eq!(doc.as_str(), " doc comment");
let name_2 = FileName::Custom("crlf_source_2".to_string());
let source = "/// doc comment\r\n/// line 2\r\nfn foo() {}".to_string();
let item = parse_item_from_source_str(name_2, source, &psess).unwrap().unwrap();
let docs = item.attrs.iter().filter_map(|at| at.doc_str()).collect::<Vec<_>>();
let b: &[_] = &[Symbol::intern(" doc comment"), Symbol::intern(" line 2")];
assert_eq!(&docs[..], b);
let name_3 = FileName::Custom("clrf_source_3".to_string());
let source = "/** doc comment\r\n * with CRLF */\r\nfn foo() {}".to_string();
let item = parse_item_from_source_str(name_3, source, &psess).unwrap().unwrap();
let doc = item.attrs.iter().filter_map(|at| at.doc_str()).next().unwrap();
assert_eq!(doc.as_str(), " doc comment\n * with CRLF ");
});
}
#[test]
fn ttdelim_span() {
fn parse_expr_from_source_str(
name: FileName,
source: String,
psess: &ParseSess,
) -> PResult<'_, P<ast::Expr>> {
new_parser_from_source_str(psess, name, source).parse_expr()
}
create_default_session_globals_then(|| {
let psess = psess();
let expr = parse_expr_from_source_str(
PathBuf::from("foo").into(),
"foo!( fn main() { body } )".to_string(),
&psess,
)
.unwrap();
let ast::ExprKind::MacCall(mac) = &expr.kind else { panic!("not a macro") };
let span = mac.args.tokens.trees().last().unwrap().span();
match psess.source_map().span_to_snippet(span) {
Ok(s) => assert_eq!(&s[..], "{ body }"),
Err(_) => panic!("could not get snippet"),
}
});
}
// This tests that when parsing a string (rather than a file) we don't try
// and read in a file for a module declaration and just parse a stub.
// See `recurse_into_file_modules` in the parser.
#[test]
fn out_of_line_mod() {
create_default_session_globals_then(|| {
let item = parse_item_from_source_str(
PathBuf::from("foo").into(),
"mod foo { struct S; mod this_does_not_exist; }".to_owned(),
&psess(),
)
.unwrap()
.unwrap();
let ast::ItemKind::Mod(_, mod_kind) = &item.kind else { panic!() };
assert!(matches!(mod_kind, ast::ModKind::Loaded(items, ..) if items.len() == 2));
});
}
#[test]
fn eqmodws() {
assert_eq!(matches_codepattern("", ""), true);
assert_eq!(matches_codepattern("", "a"), false);
assert_eq!(matches_codepattern("a", ""), false);
assert_eq!(matches_codepattern("a", "a"), true);
assert_eq!(matches_codepattern("a b", "a \n\t\r b"), true);
assert_eq!(matches_codepattern("a b ", "a \n\t\r b"), true);
assert_eq!(matches_codepattern("a b", "a \n\t\r b "), false);
assert_eq!(matches_codepattern("a b", "a b"), true);
assert_eq!(matches_codepattern("ab", "a b"), false);
assert_eq!(matches_codepattern("a b", "ab"), true);
assert_eq!(matches_codepattern(" a b", "ab"), true);
}
#[test]
fn pattern_whitespace() {
assert_eq!(matches_codepattern("", "\x0C"), false);
assert_eq!(matches_codepattern("a b ", "a \u{0085}\n\t\r b"), true);
assert_eq!(matches_codepattern("a b", "a \u{0085}\n\t\r b "), false);
}
#[test]
fn non_pattern_whitespace() {
// These have the property 'White_Space' but not 'Pattern_White_Space'
assert_eq!(matches_codepattern("a b", "a\u{2002}b"), false);
assert_eq!(matches_codepattern("a b", "a\u{2002}b"), false);
assert_eq!(matches_codepattern("\u{205F}a b", "ab"), false);
assert_eq!(matches_codepattern("a \u{3000}b", "ab"), false);
}

4
compiler/rustc_parse/Cargo.toml
View File

@ -21,3 +21,7 @@ tracing = "0.1"
unicode-normalization = "0.1.11" unicode-normalization = "0.1.11"
unicode-width = "0.1.4" unicode-width = "0.1.4"
# tidy-alphabetical-end # tidy-alphabetical-end
[dev-dependencies]
termcolor = "1.2"

14
compiler/rustc_parse/src/parser/mod.rs
View File

@ -45,6 +45,20 @@ use crate::errors::{
self, IncorrectVisibilityRestriction, MismatchedClosingDelimiter, NonStringAbiLiteral, self, IncorrectVisibilityRestriction, MismatchedClosingDelimiter, NonStringAbiLiteral,
}; };
#[cfg(test)]
mod tests;
// Ideally, these tests would be in `rustc_ast`. But they depend on having a
// parser, so they are here.
#[cfg(test)]
mod tokenstream {
mod tests;
}
#[cfg(test)]
mod mut_visit {
mod tests;
}
bitflags::bitflags! { bitflags::bitflags! {
#[derive(Clone, Copy)] #[derive(Clone, Copy)]
struct Restrictions: u8 { struct Restrictions: u8 {

3
compiler/rustc_expand/src/mut_visit/tests.rs → compiler/rustc_parse/src/parser/mut_visit/tests.rs
View File

@ -1,5 +1,4 @@
use crate::tests::{matches_codepattern, string_to_crate}; use crate::parser::tests::{matches_codepattern, string_to_crate};
use rustc_ast as ast; use rustc_ast as ast;
use rustc_ast::mut_visit::MutVisitor; use rustc_ast::mut_visit::MutVisitor;
use rustc_ast_pretty::pprust; use rustc_ast_pretty::pprust;

401
compiler/rustc_expand/src/tests.rs → compiler/rustc_parse/src/parser/tests.rs
View File

@ -1,25 +1,30 @@
use rustc_ast as ast; use crate::parser::ForceCollect;
use rustc_ast::tokenstream::TokenStream; use crate::{new_parser_from_source_str, parser::Parser, source_file_to_stream};
use rustc_parse::{new_parser_from_source_str, parser::Parser, source_file_to_stream}; use ast::token::IdentIsRaw;
use rustc_session::parse::ParseSess; use rustc_ast::ptr::P;
use rustc_span::create_default_session_globals_then; use rustc_ast::token::{self, Delimiter, Token};
use rustc_span::source_map::{FilePathMapping, SourceMap}; use rustc_ast::tokenstream::{DelimSpacing, DelimSpan, Spacing, TokenStream, TokenTree};
use rustc_span::{BytePos, Span}; use rustc_ast::visit;
use rustc_ast::{self as ast, PatKind};
use rustc_ast_pretty::pprust::item_to_string;
use rustc_data_structures::sync::Lrc; use rustc_data_structures::sync::Lrc;
use rustc_errors::emitter::HumanEmitter; use rustc_errors::emitter::HumanEmitter;
use rustc_errors::{DiagCtxt, MultiSpan, PResult}; use rustc_errors::{DiagCtxt, MultiSpan, PResult};
use termcolor::WriteColor; use rustc_session::parse::ParseSess;
use rustc_span::create_default_session_globals_then;
use rustc_span::source_map::{FilePathMapping, SourceMap};
use rustc_span::symbol::{kw, sym, Symbol};
use rustc_span::{BytePos, FileName, Pos, Span};
use std::io; use std::io;
use std::io::prelude::*; use std::io::prelude::*;
use std::iter::Peekable; use std::iter::Peekable;
use std::path::{Path, PathBuf}; use std::path::{Path, PathBuf};
use std::str; use std::str;
use std::sync::{Arc, Mutex}; use std::sync::{Arc, Mutex};
use termcolor::WriteColor;
pub(crate) fn psess() -> ParseSess { fn psess() -> ParseSess {
ParseSess::new(vec![crate::DEFAULT_LOCALE_RESOURCE, rustc_parse::DEFAULT_LOCALE_RESOURCE]) ParseSess::new(vec![crate::DEFAULT_LOCALE_RESOURCE, crate::DEFAULT_LOCALE_RESOURCE])
} }
/// Map string to parser (via tts). /// Map string to parser (via tts).
@ -31,7 +36,7 @@ fn create_test_handler() -> (DiagCtxt, Lrc<SourceMap>, Arc<Mutex<Vec<u8>>>) {
let output = Arc::new(Mutex::new(Vec::new())); let output = Arc::new(Mutex::new(Vec::new()));
let source_map = Lrc::new(SourceMap::new(FilePathMapping::empty())); let source_map = Lrc::new(SourceMap::new(FilePathMapping::empty()));
let fallback_bundle = rustc_errors::fallback_fluent_bundle( let fallback_bundle = rustc_errors::fallback_fluent_bundle(
vec![crate::DEFAULT_LOCALE_RESOURCE, rustc_parse::DEFAULT_LOCALE_RESOURCE], vec![crate::DEFAULT_LOCALE_RESOURCE, crate::DEFAULT_LOCALE_RESOURCE],
false, false,
); );
let emitter = HumanEmitter::new(Box::new(Shared { data: output.clone() }), fallback_bundle) let emitter = HumanEmitter::new(Box::new(Shared { data: output.clone() }), fallback_bundle)
@ -44,7 +49,7 @@ fn create_test_handler() -> (DiagCtxt, Lrc<SourceMap>, Arc<Mutex<Vec<u8>>>) {
/// Returns the result of parsing the given string via the given callback. /// Returns the result of parsing the given string via the given callback.
/// ///
/// If there are any errors, this will panic. /// If there are any errors, this will panic.
pub(crate) fn with_error_checking_parse<'a, T, F>(s: String, psess: &'a ParseSess, f: F) -> T fn with_error_checking_parse<'a, T, F>(s: String, psess: &'a ParseSess, f: F) -> T
where where
F: FnOnce(&mut Parser<'a>) -> PResult<'a, T>, F: FnOnce(&mut Parser<'a>) -> PResult<'a, T>,
{ {
@ -56,7 +61,7 @@ where
/// Verifies that parsing the given string using the given callback will /// Verifies that parsing the given string using the given callback will
/// generate an error that contains the given text. /// generate an error that contains the given text.
pub(crate) fn with_expected_parse_error<T, F>(source_str: &str, expected_output: &str, f: F) fn with_expected_parse_error<T, F>(source_str: &str, expected_output: &str, f: F)
where where
F: for<'a> FnOnce(&mut Parser<'a>) -> PResult<'a, T>, F: for<'a> FnOnce(&mut Parser<'a>) -> PResult<'a, T>,
{ {
@ -150,8 +155,8 @@ struct SpanLabel {
label: &'static str, label: &'static str,
} }
pub(crate) struct Shared<T: Write> { struct Shared<T: Write> {
pub data: Arc<Mutex<T>>, data: Arc<Mutex<T>>,
} }
impl<T: Write> WriteColor for Shared<T> { impl<T: Write> WriteColor for Shared<T> {
@ -1053,3 +1058,365 @@ error: foo
"#, "#,
); );
} }
/// Parses an item.
///
/// Returns `Ok(Some(item))` when successful, `Ok(None)` when no item was found, and `Err`
/// when a syntax error occurred.
fn parse_item_from_source_str(
name: FileName,
source: String,
psess: &ParseSess,
) -> PResult<'_, Option<P<ast::Item>>> {
new_parser_from_source_str(psess, name, source).parse_item(ForceCollect::No)
}
// Produces a `rustc_span::span`.
fn sp(a: u32, b: u32) -> Span {
Span::with_root_ctxt(BytePos(a), BytePos(b))
}
/// Parses a string, return an expression.
fn string_to_expr(source_str: String) -> P<ast::Expr> {
with_error_checking_parse(source_str, &psess(), |p| p.parse_expr())
}
/// Parses a string, returns an item.
fn string_to_item(source_str: String) -> Option<P<ast::Item>> {
with_error_checking_parse(source_str, &psess(), |p| p.parse_item(ForceCollect::No))
}
#[test]
fn bad_path_expr_1() {
// This should trigger error: expected identifier, found keyword `return`
create_default_session_globals_then(|| {
with_expected_parse_error(
"::abc::def::return",
"expected identifier, found keyword `return`",
|p| p.parse_expr(),
);
})
}
// Checks the token-tree-ization of macros.
#[test]
fn string_to_tts_macro() {
create_default_session_globals_then(|| {
let stream = string_to_stream("macro_rules! zip (($a)=>($a))".to_string());
let tts = &stream.trees().collect::<Vec<_>>()[..];
match tts {
[
TokenTree::Token(
Token { kind: token::Ident(name_macro_rules, IdentIsRaw::No), .. },
_,
),
TokenTree::Token(Token { kind: token::Not, .. }, _),
TokenTree::Token(Token { kind: token::Ident(name_zip, IdentIsRaw::No), .. }, _),
TokenTree::Delimited(.., macro_delim, macro_tts),
] if name_macro_rules == &kw::MacroRules && name_zip.as_str() == "zip" => {
let tts = &macro_tts.trees().collect::<Vec<_>>();
match &tts[..] {
[
TokenTree::Delimited(.., first_delim, first_tts),
TokenTree::Token(Token { kind: token::FatArrow, .. }, _),
TokenTree::Delimited(.., second_delim, second_tts),
] if macro_delim == &Delimiter::Parenthesis => {
let tts = &first_tts.trees().collect::<Vec<_>>();
match &tts[..] {
[
TokenTree::Token(Token { kind: token::Dollar, .. }, _),
TokenTree::Token(
Token { kind: token::Ident(name, IdentIsRaw::No), .. },
_,
),
] if first_delim == &Delimiter::Parenthesis && name.as_str() == "a" => {
}
_ => panic!("value 3: {:?} {:?}", first_delim, first_tts),
}
let tts = &second_tts.trees().collect::<Vec<_>>();
match &tts[..] {
[
TokenTree::Token(Token { kind: token::Dollar, .. }, _),
TokenTree::Token(
Token { kind: token::Ident(name, IdentIsRaw::No), .. },
_,
),
] if second_delim == &Delimiter::Parenthesis
&& name.as_str() == "a" => {}
_ => panic!("value 4: {:?} {:?}", second_delim, second_tts),
}
}
_ => panic!("value 2: {:?} {:?}", macro_delim, macro_tts),
}
}
_ => panic!("value: {:?}", tts),
}
})
}
#[test]
fn string_to_tts_1() {
create_default_session_globals_then(|| {
let tts = string_to_stream("fn a(b: i32) { b; }".to_string());
let expected = TokenStream::new(vec![
TokenTree::token_alone(token::Ident(kw::Fn, IdentIsRaw::No), sp(0, 2)),
TokenTree::token_joint_hidden(
token::Ident(Symbol::intern("a"), IdentIsRaw::No),
sp(3, 4),
),
TokenTree::Delimited(
DelimSpan::from_pair(sp(4, 5), sp(11, 12)),
// `JointHidden` because the `(` is followed immediately by
// `b`, `Alone` because the `)` is followed by whitespace.
DelimSpacing::new(Spacing::JointHidden, Spacing::Alone),
Delimiter::Parenthesis,
TokenStream::new(vec![
TokenTree::token_joint(
token::Ident(Symbol::intern("b"), IdentIsRaw::No),
sp(5, 6),
),
TokenTree::token_alone(token::Colon, sp(6, 7)),
// `JointHidden` because the `i32` is immediately followed by the `)`.
TokenTree::token_joint_hidden(
token::Ident(sym::i32, IdentIsRaw::No),
sp(8, 11),
),
])
.into(),
),
TokenTree::Delimited(
DelimSpan::from_pair(sp(13, 14), sp(18, 19)),
// First `Alone` because the `{` is followed by whitespace,
// second `Alone` because the `}` is followed immediately by
// EOF.
DelimSpacing::new(Spacing::Alone, Spacing::Alone),
Delimiter::Brace,
TokenStream::new(vec![
TokenTree::token_joint(
token::Ident(Symbol::intern("b"), IdentIsRaw::No),
sp(15, 16),
),
// `Alone` because the `;` is followed by whitespace.
TokenTree::token_alone(token::Semi, sp(16, 17)),
])
.into(),
),
]);
assert_eq!(tts, expected);
})
}
#[test]
fn parse_use() {
create_default_session_globals_then(|| {
let use_s = "use foo::bar::baz;";
let vitem = string_to_item(use_s.to_string()).unwrap();
let vitem_s = item_to_string(&vitem);
assert_eq!(&vitem_s[..], use_s);
let use_s = "use foo::bar as baz;";
let vitem = string_to_item(use_s.to_string()).unwrap();
let vitem_s = item_to_string(&vitem);
assert_eq!(&vitem_s[..], use_s);
})
}
#[test]
fn parse_extern_crate() {
create_default_session_globals_then(|| {
let ex_s = "extern crate foo;";
let vitem = string_to_item(ex_s.to_string()).unwrap();
let vitem_s = item_to_string(&vitem);
assert_eq!(&vitem_s[..], ex_s);
let ex_s = "extern crate foo as bar;";
let vitem = string_to_item(ex_s.to_string()).unwrap();
let vitem_s = item_to_string(&vitem);
assert_eq!(&vitem_s[..], ex_s);
})
}
fn get_spans_of_pat_idents(src: &str) -> Vec<Span> {
let item = string_to_item(src.to_string()).unwrap();
struct PatIdentVisitor {
spans: Vec<Span>,
}
impl<'a> visit::Visitor<'a> for PatIdentVisitor {
fn visit_pat(&mut self, p: &'a ast::Pat) {
match &p.kind {
PatKind::Ident(_, ident, _) => {
self.spans.push(ident.span);
}
_ => {
visit::walk_pat(self, p);
}
}
}
}
let mut v = PatIdentVisitor { spans: Vec::new() };
visit::walk_item(&mut v, &item);
return v.spans;
}
#[test]
fn span_of_self_arg_pat_idents_are_correct() {
create_default_session_globals_then(|| {
let srcs = [
"impl z { fn a (&self, &myarg: i32) {} }",
"impl z { fn a (&mut self, &myarg: i32) {} }",
"impl z { fn a (&'a self, &myarg: i32) {} }",
"impl z { fn a (self, &myarg: i32) {} }",
"impl z { fn a (self: Foo, &myarg: i32) {} }",
];
for src in srcs {
let spans = get_spans_of_pat_idents(src);
let (lo, hi) = (spans[0].lo(), spans[0].hi());
assert!(
"self" == &src[lo.to_usize()..hi.to_usize()],
"\"{}\" != \"self\". src=\"{}\"",
&src[lo.to_usize()..hi.to_usize()],
src
)
}
})
}
#[test]
fn parse_exprs() {
create_default_session_globals_then(|| {
// just make sure that they parse....
string_to_expr("3 + 4".to_string());
string_to_expr("a::z.froob(b,&(987+3))".to_string());
})
}
#[test]
fn attrs_fix_bug() {
create_default_session_globals_then(|| {
string_to_item(
"pub fn mk_file_writer(path: &Path, flags: &[FileFlag])
-> Result<Box<Writer>, String> {
#[cfg(windows)]
fn wb() -> c_int {
(O_WRONLY | libc::consts::os::extra::O_BINARY) as c_int
}
#[cfg(unix)]
fn wb() -> c_int { O_WRONLY as c_int }
let mut fflags: c_int = wb();
}"
.to_string(),
);
})
}
#[test]
fn crlf_doc_comments() {
create_default_session_globals_then(|| {
let psess = psess();
let name_1 = FileName::Custom("crlf_source_1".to_string());
let source = "/// doc comment\r\nfn foo() {}".to_string();
let item = parse_item_from_source_str(name_1, source, &psess).unwrap().unwrap();
let doc = item.attrs.iter().filter_map(|at| at.doc_str()).next().unwrap();
assert_eq!(doc.as_str(), " doc comment");
let name_2 = FileName::Custom("crlf_source_2".to_string());
let source = "/// doc comment\r\n/// line 2\r\nfn foo() {}".to_string();
let item = parse_item_from_source_str(name_2, source, &psess).unwrap().unwrap();
let docs = item.attrs.iter().filter_map(|at| at.doc_str()).collect::<Vec<_>>();
let b: &[_] = &[Symbol::intern(" doc comment"), Symbol::intern(" line 2")];
assert_eq!(&docs[..], b);
let name_3 = FileName::Custom("clrf_source_3".to_string());
let source = "/** doc comment\r\n * with CRLF */\r\nfn foo() {}".to_string();
let item = parse_item_from_source_str(name_3, source, &psess).unwrap().unwrap();
let doc = item.attrs.iter().filter_map(|at| at.doc_str()).next().unwrap();
assert_eq!(doc.as_str(), " doc comment\n * with CRLF ");
});
}
#[test]
fn ttdelim_span() {
fn parse_expr_from_source_str(
name: FileName,
source: String,
psess: &ParseSess,
) -> PResult<'_, P<ast::Expr>> {
new_parser_from_source_str(psess, name, source).parse_expr()
}
create_default_session_globals_then(|| {
let psess = psess();
let expr = parse_expr_from_source_str(
PathBuf::from("foo").into(),
"foo!( fn main() { body } )".to_string(),
&psess,
)
.unwrap();
let ast::ExprKind::MacCall(mac) = &expr.kind else { panic!("not a macro") };
let span = mac.args.tokens.trees().last().unwrap().span();
match psess.source_map().span_to_snippet(span) {
Ok(s) => assert_eq!(&s[..], "{ body }"),
Err(_) => panic!("could not get snippet"),
}
});
}
// This tests that when parsing a string (rather than a file) we don't try
// and read in a file for a module declaration and just parse a stub.
// See `recurse_into_file_modules` in the parser.
#[test]
fn out_of_line_mod() {
create_default_session_globals_then(|| {
let item = parse_item_from_source_str(
PathBuf::from("foo").into(),
"mod foo { struct S; mod this_does_not_exist; }".to_owned(),
&psess(),
)
.unwrap()
.unwrap();
let ast::ItemKind::Mod(_, mod_kind) = &item.kind else { panic!() };
assert!(matches!(mod_kind, ast::ModKind::Loaded(items, ..) if items.len() == 2));
});
}
#[test]
fn eqmodws() {
assert_eq!(matches_codepattern("", ""), true);
assert_eq!(matches_codepattern("", "a"), false);
assert_eq!(matches_codepattern("a", ""), false);
assert_eq!(matches_codepattern("a", "a"), true);
assert_eq!(matches_codepattern("a b", "a \n\t\r b"), true);
assert_eq!(matches_codepattern("a b ", "a \n\t\r b"), true);
assert_eq!(matches_codepattern("a b", "a \n\t\r b "), false);
assert_eq!(matches_codepattern("a b", "a b"), true);
assert_eq!(matches_codepattern("ab", "a b"), false);
assert_eq!(matches_codepattern("a b", "ab"), true);
assert_eq!(matches_codepattern(" a b", "ab"), true);
}
#[test]
fn pattern_whitespace() {
assert_eq!(matches_codepattern("", "\x0C"), false);
assert_eq!(matches_codepattern("a b ", "a \u{0085}\n\t\r b"), true);
assert_eq!(matches_codepattern("a b", "a \u{0085}\n\t\r b "), false);
}
#[test]
fn non_pattern_whitespace() {
// These have the property 'White_Space' but not 'Pattern_White_Space'
assert_eq!(matches_codepattern("a b", "a\u{2002}b"), false);
assert_eq!(matches_codepattern("a b", "a\u{2002}b"), false);
assert_eq!(matches_codepattern("\u{205F}a b", "ab"), false);
assert_eq!(matches_codepattern("a \u{3000}b", "ab"), false);
}

3
compiler/rustc_expand/src/tokenstream/tests.rs → compiler/rustc_parse/src/parser/tokenstream/tests.rs
View File

@ -1,5 +1,4 @@
use crate::tests::string_to_stream; use crate::parser::tests::string_to_stream;
use rustc_ast::token::{self, IdentIsRaw}; use rustc_ast::token::{self, IdentIsRaw};
use rustc_ast::tokenstream::{TokenStream, TokenTree}; use rustc_ast::tokenstream::{TokenStream, TokenTree};
use rustc_span::create_default_session_globals_then; use rustc_span::create_default_session_globals_then;