| //! The main parser interface. |
| |
| use crate::ast::{self, CrateConfig, NodeId}; |
| use crate::early_buffered_lints::{BufferedEarlyLint, BufferedEarlyLintId}; |
| use crate::source_map::{SourceMap, FilePathMapping}; |
| use crate::feature_gate::UnstableFeatures; |
| use crate::parse::parser::Parser; |
| use crate::parse::parser::emit_unclosed_delims; |
| use crate::parse::token::TokenKind; |
| use crate::tokenstream::{TokenStream, TokenTree}; |
| use crate::diagnostics::plugin::ErrorMap; |
| use crate::print::pprust; |
| |
| use errors::{Applicability, FatalError, Level, Handler, ColorConfig, Diagnostic, DiagnosticBuilder}; |
| use rustc_data_structures::sync::{Lrc, Lock}; |
| use syntax_pos::{Span, SourceFile, FileName, MultiSpan}; |
| use syntax_pos::edition::Edition; |
| |
| use rustc_data_structures::fx::{FxHashSet, FxHashMap}; |
| use std::borrow::Cow; |
| use std::path::{Path, PathBuf}; |
| use std::str; |
| |
| pub type PResult<'a, T> = Result<T, DiagnosticBuilder<'a>>; |
| |
| #[macro_use] |
| pub mod parser; |
| pub mod attr; |
| pub mod lexer; |
| pub mod token; |
| |
| crate mod classify; |
| crate mod diagnostics; |
| crate mod literal; |
| crate mod unescape; |
| crate mod unescape_error_reporting; |
| |
| /// Info about a parsing session. |
| pub struct ParseSess { |
| pub span_diagnostic: Handler, |
| pub unstable_features: UnstableFeatures, |
| pub config: CrateConfig, |
| pub edition: Edition, |
| pub missing_fragment_specifiers: Lock<FxHashSet<Span>>, |
| /// Places where raw identifiers were used. This is used for feature-gating raw identifiers. |
| pub raw_identifier_spans: Lock<Vec<Span>>, |
| /// The registered diagnostics codes. |
| crate registered_diagnostics: Lock<ErrorMap>, |
| /// Used to determine and report recursive module inclusions. |
| included_mod_stack: Lock<Vec<PathBuf>>, |
| source_map: Lrc<SourceMap>, |
| pub buffered_lints: Lock<Vec<BufferedEarlyLint>>, |
| /// Contains the spans of block expressions that could have been incomplete based on the |
| /// operation token that followed it, but that the parser cannot identify without further |
| /// analysis. |
| pub ambiguous_block_expr_parse: Lock<FxHashMap<Span, Span>>, |
| pub param_attr_spans: Lock<Vec<Span>> |
| } |
| |
| impl ParseSess { |
| pub fn new(file_path_mapping: FilePathMapping) -> Self { |
| let cm = Lrc::new(SourceMap::new(file_path_mapping)); |
| let handler = Handler::with_tty_emitter(ColorConfig::Auto, |
| true, |
| None, |
| Some(cm.clone())); |
| ParseSess::with_span_handler(handler, cm) |
| } |
| |
| pub fn with_span_handler(handler: Handler, source_map: Lrc<SourceMap>) -> ParseSess { |
| ParseSess { |
| span_diagnostic: handler, |
| unstable_features: UnstableFeatures::from_environment(), |
| config: FxHashSet::default(), |
| missing_fragment_specifiers: Lock::new(FxHashSet::default()), |
| raw_identifier_spans: Lock::new(Vec::new()), |
| registered_diagnostics: Lock::new(ErrorMap::new()), |
| included_mod_stack: Lock::new(vec![]), |
| source_map, |
| buffered_lints: Lock::new(vec![]), |
| edition: Edition::from_session(), |
| ambiguous_block_expr_parse: Lock::new(FxHashMap::default()), |
| param_attr_spans: Lock::new(Vec::new()), |
| } |
| } |
| |
| #[inline] |
| pub fn source_map(&self) -> &SourceMap { |
| &self.source_map |
| } |
| |
| pub fn buffer_lint<S: Into<MultiSpan>>(&self, |
| lint_id: BufferedEarlyLintId, |
| span: S, |
| id: NodeId, |
| msg: &str, |
| ) { |
| self.buffered_lints.with_lock(|buffered_lints| { |
| buffered_lints.push(BufferedEarlyLint{ |
| span: span.into(), |
| id, |
| msg: msg.into(), |
| lint_id, |
| }); |
| }); |
| } |
| |
| /// Extend an error with a suggestion to wrap an expression with parentheses to allow the |
| /// parser to continue parsing the following operation as part of the same expression. |
| pub fn expr_parentheses_needed( |
| &self, |
| err: &mut DiagnosticBuilder<'_>, |
| span: Span, |
| alt_snippet: Option<String>, |
| ) { |
| if let Some(snippet) = self.source_map().span_to_snippet(span).ok().or(alt_snippet) { |
| err.span_suggestion( |
| span, |
| "parentheses are required to parse this as an expression", |
| format!("({})", snippet), |
| Applicability::MachineApplicable, |
| ); |
| } |
| } |
| } |
| |
| #[derive(Clone)] |
| pub struct Directory<'a> { |
| pub path: Cow<'a, Path>, |
| pub ownership: DirectoryOwnership, |
| } |
| |
| #[derive(Copy, Clone)] |
| pub enum DirectoryOwnership { |
| Owned { |
| // None if `mod.rs`, `Some("foo")` if we're in `foo.rs` |
| relative: Option<ast::Ident>, |
| }, |
| UnownedViaBlock, |
| UnownedViaMod(bool /* legacy warnings? */), |
| } |
| |
| // a bunch of utility functions of the form parse_<thing>_from_<source> |
| // where <thing> includes crate, expr, item, stmt, tts, and one that |
| // uses a HOF to parse anything, and <source> includes file and |
| // source_str. |
| |
| pub fn parse_crate_from_file<'a>(input: &Path, sess: &'a ParseSess) -> PResult<'a, ast::Crate> { |
| let mut parser = new_parser_from_file(sess, input); |
| parser.parse_crate_mod() |
| } |
| |
| pub fn parse_crate_attrs_from_file<'a>(input: &Path, sess: &'a ParseSess) |
| -> PResult<'a, Vec<ast::Attribute>> { |
| let mut parser = new_parser_from_file(sess, input); |
| parser.parse_inner_attributes() |
| } |
| |
| pub fn parse_crate_from_source_str(name: FileName, source: String, sess: &ParseSess) |
| -> PResult<'_, ast::Crate> { |
| new_parser_from_source_str(sess, name, source).parse_crate_mod() |
| } |
| |
| pub fn parse_crate_attrs_from_source_str(name: FileName, source: String, sess: &ParseSess) |
| -> PResult<'_, Vec<ast::Attribute>> { |
| new_parser_from_source_str(sess, name, source).parse_inner_attributes() |
| } |
| |
| pub fn parse_stream_from_source_str( |
| name: FileName, |
| source: String, |
| sess: &ParseSess, |
| override_span: Option<Span>, |
| ) -> TokenStream { |
| let (stream, mut errors) = source_file_to_stream( |
| sess, |
| sess.source_map().new_source_file(name, source), |
| override_span, |
| ); |
| emit_unclosed_delims(&mut errors, &sess.span_diagnostic); |
| stream |
| } |
| |
| /// Creates a new parser from a source string. |
| pub fn new_parser_from_source_str(sess: &ParseSess, name: FileName, source: String) -> Parser<'_> { |
| panictry_buffer!(&sess.span_diagnostic, maybe_new_parser_from_source_str(sess, name, source)) |
| } |
| |
| /// Creates a new parser from a source string. Returns any buffered errors from lexing the initial |
| /// token stream. |
| pub fn maybe_new_parser_from_source_str(sess: &ParseSess, name: FileName, source: String) |
| -> Result<Parser<'_>, Vec<Diagnostic>> |
| { |
| let mut parser = maybe_source_file_to_parser(sess, |
| sess.source_map().new_source_file(name, source))?; |
| parser.recurse_into_file_modules = false; |
| Ok(parser) |
| } |
| |
| /// Creates a new parser, handling errors as appropriate |
| /// if the file doesn't exist |
| pub fn new_parser_from_file<'a>(sess: &'a ParseSess, path: &Path) -> Parser<'a> { |
| source_file_to_parser(sess, file_to_source_file(sess, path, None)) |
| } |
| |
| /// Creates a new parser, returning buffered diagnostics if the file doesn't |
| /// exist or from lexing the initial token stream. |
| pub fn maybe_new_parser_from_file<'a>(sess: &'a ParseSess, path: &Path) |
| -> Result<Parser<'a>, Vec<Diagnostic>> { |
| let file = try_file_to_source_file(sess, path, None).map_err(|db| vec![db])?; |
| maybe_source_file_to_parser(sess, file) |
| } |
| |
| /// Given a session, a crate config, a path, and a span, add |
| /// the file at the given path to the source_map, and return a parser. |
| /// On an error, use the given span as the source of the problem. |
| pub fn new_sub_parser_from_file<'a>(sess: &'a ParseSess, |
| path: &Path, |
| directory_ownership: DirectoryOwnership, |
| module_name: Option<String>, |
| sp: Span) -> Parser<'a> { |
| let mut p = source_file_to_parser(sess, file_to_source_file(sess, path, Some(sp))); |
| p.directory.ownership = directory_ownership; |
| p.root_module_name = module_name; |
| p |
| } |
| |
| /// Given a source_file and config, return a parser |
| fn source_file_to_parser(sess: &ParseSess, source_file: Lrc<SourceFile>) -> Parser<'_> { |
| panictry_buffer!(&sess.span_diagnostic, |
| maybe_source_file_to_parser(sess, source_file)) |
| } |
| |
| /// Given a source_file and config, return a parser. Returns any buffered errors from lexing the |
| /// initial token stream. |
| fn maybe_source_file_to_parser( |
| sess: &ParseSess, |
| source_file: Lrc<SourceFile>, |
| ) -> Result<Parser<'_>, Vec<Diagnostic>> { |
| let end_pos = source_file.end_pos; |
| let (stream, unclosed_delims) = maybe_file_to_stream(sess, source_file, None)?; |
| let mut parser = stream_to_parser(sess, stream, None); |
| parser.unclosed_delims = unclosed_delims; |
| if parser.token == token::Eof && parser.token.span.is_dummy() { |
| parser.token.span = Span::new(end_pos, end_pos, parser.token.span.ctxt()); |
| } |
| |
| Ok(parser) |
| } |
| |
| // must preserve old name for now, because quote! from the *existing* |
| // compiler expands into it |
| pub fn new_parser_from_tts(sess: &ParseSess, tts: Vec<TokenTree>) -> Parser<'_> { |
| stream_to_parser(sess, tts.into_iter().collect(), crate::MACRO_ARGUMENTS) |
| } |
| |
| |
| // base abstractions |
| |
| /// Given a session and a path and an optional span (for error reporting), |
| /// add the path to the session's source_map and return the new source_file or |
| /// error when a file can't be read. |
| fn try_file_to_source_file(sess: &ParseSess, path: &Path, spanopt: Option<Span>) |
| -> Result<Lrc<SourceFile>, Diagnostic> { |
| sess.source_map().load_file(path) |
| .map_err(|e| { |
| let msg = format!("couldn't read {}: {}", path.display(), e); |
| let mut diag = Diagnostic::new(Level::Fatal, &msg); |
| if let Some(sp) = spanopt { |
| diag.set_span(sp); |
| } |
| diag |
| }) |
| } |
| |
| /// Given a session and a path and an optional span (for error reporting), |
| /// add the path to the session's `source_map` and return the new `source_file`. |
| fn file_to_source_file(sess: &ParseSess, path: &Path, spanopt: Option<Span>) |
| -> Lrc<SourceFile> { |
| match try_file_to_source_file(sess, path, spanopt) { |
| Ok(source_file) => source_file, |
| Err(d) => { |
| DiagnosticBuilder::new_diagnostic(&sess.span_diagnostic, d).emit(); |
| FatalError.raise(); |
| } |
| } |
| } |
| |
| /// Given a source_file, produces a sequence of token trees. |
| pub fn source_file_to_stream( |
| sess: &ParseSess, |
| source_file: Lrc<SourceFile>, |
| override_span: Option<Span>, |
| ) -> (TokenStream, Vec<lexer::UnmatchedBrace>) { |
| panictry_buffer!(&sess.span_diagnostic, maybe_file_to_stream(sess, source_file, override_span)) |
| } |
| |
| /// Given a source file, produces a sequence of token trees. Returns any buffered errors from |
| /// parsing the token stream. |
| pub fn maybe_file_to_stream( |
| sess: &ParseSess, |
| source_file: Lrc<SourceFile>, |
| override_span: Option<Span>, |
| ) -> Result<(TokenStream, Vec<lexer::UnmatchedBrace>), Vec<Diagnostic>> { |
| let srdr = lexer::StringReader::new_or_buffered_errs(sess, source_file, override_span)?; |
| let (token_trees, unmatched_braces) = srdr.into_token_trees(); |
| |
| match token_trees { |
| Ok(stream) => Ok((stream, unmatched_braces)), |
| Err(err) => { |
| let mut buffer = Vec::with_capacity(1); |
| err.buffer(&mut buffer); |
| // Not using `emit_unclosed_delims` to use `db.buffer` |
| for unmatched in unmatched_braces { |
| let mut db = sess.span_diagnostic.struct_span_err(unmatched.found_span, &format!( |
| "incorrect close delimiter: `{}`", |
| pprust::token_kind_to_string(&token::CloseDelim(unmatched.found_delim)), |
| )); |
| db.span_label(unmatched.found_span, "incorrect close delimiter"); |
| if let Some(sp) = unmatched.candidate_span { |
| db.span_label(sp, "close delimiter possibly meant for this"); |
| } |
| if let Some(sp) = unmatched.unclosed_span { |
| db.span_label(sp, "un-closed delimiter"); |
| } |
| db.buffer(&mut buffer); |
| } |
| Err(buffer) |
| } |
| } |
| } |
| |
| /// Given stream and the `ParseSess`, produces a parser. |
| pub fn stream_to_parser<'a>( |
| sess: &'a ParseSess, |
| stream: TokenStream, |
| subparser_name: Option<&'static str>, |
| ) -> Parser<'a> { |
| Parser::new(sess, stream, None, true, false, subparser_name) |
| } |
| |
| /// Given stream, the `ParseSess` and the base directory, produces a parser. |
| /// |
| /// Use this function when you are creating a parser from the token stream |
| /// and also care about the current working directory of the parser (e.g., |
| /// you are trying to resolve modules defined inside a macro invocation). |
| /// |
| /// # Note |
| /// |
| /// The main usage of this function is outside of rustc, for those who uses |
| /// libsyntax as a library. Please do not remove this function while refactoring |
| /// just because it is not used in rustc codebase! |
| pub fn stream_to_parser_with_base_dir<'a>( |
| sess: &'a ParseSess, |
| stream: TokenStream, |
| base_dir: Directory<'a>, |
| ) -> Parser<'a> { |
| Parser::new(sess, stream, Some(base_dir), true, false, None) |
| } |
| |
| /// A sequence separator. |
| pub struct SeqSep { |
| /// The seperator token. |
| pub sep: Option<TokenKind>, |
| /// `true` if a trailing separator is allowed. |
| pub trailing_sep_allowed: bool, |
| } |
| |
| impl SeqSep { |
| pub fn trailing_allowed(t: TokenKind) -> SeqSep { |
| SeqSep { |
| sep: Some(t), |
| trailing_sep_allowed: true, |
| } |
| } |
| |
| pub fn none() -> SeqSep { |
| SeqSep { |
| sep: None, |
| trailing_sep_allowed: false, |
| } |
| } |
| } |
| |
| #[cfg(test)] |
| mod tests { |
| use super::*; |
| use crate::ast::{self, Name, PatKind}; |
| use crate::attr::first_attr_value_str_by_name; |
| use crate::ptr::P; |
| use crate::parse::token::Token; |
| use crate::print::pprust::item_to_string; |
| use crate::symbol::{kw, sym}; |
| use crate::tokenstream::{DelimSpan, TokenTree}; |
| use crate::util::parser_testing::string_to_stream; |
| use crate::util::parser_testing::{string_to_expr, string_to_item}; |
| use crate::with_default_globals; |
| use syntax_pos::{Span, BytePos, Pos, NO_EXPANSION}; |
| |
| /// 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, sess: &ParseSess) |
| -> PResult<'_, Option<P<ast::Item>>> { |
| new_parser_from_source_str(sess, name, source).parse_item() |
| } |
| |
| // produce a syntax_pos::span |
| fn sp(a: u32, b: u32) -> Span { |
| Span::new(BytePos(a), BytePos(b), NO_EXPANSION) |
| } |
| |
| #[should_panic] |
| #[test] fn bad_path_expr_1() { |
| with_default_globals(|| { |
| string_to_expr("::abc::def::return".to_string()); |
| }) |
| } |
| |
| // check the token-tree-ization of macros |
| #[test] |
| fn string_to_tts_macro () { |
| with_default_globals(|| { |
| let tts: Vec<_> = |
| string_to_stream("macro_rules! zip (($a)=>($a))".to_string()).trees().collect(); |
| let tts: &[TokenTree] = &tts[..]; |
| |
| match tts { |
| [ |
| TokenTree::Token(Token { kind: token::Ident(name_macro_rules, false), .. }), |
| TokenTree::Token(Token { kind: token::Not, .. }), |
| TokenTree::Token(Token { kind: token::Ident(name_zip, false), .. }), |
| TokenTree::Delimited(_, macro_delim, macro_tts) |
| ] |
| if name_macro_rules == &sym::macro_rules && name_zip.as_str() == "zip" => { |
| let tts = ¯o_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 == &token::Paren => { |
| let tts = &first_tts.trees().collect::<Vec<_>>(); |
| match &tts[..] { |
| [ |
| TokenTree::Token(Token { kind: token::Dollar, .. }), |
| TokenTree::Token(Token { kind: token::Ident(name, false), .. }), |
| ] |
| if first_delim == &token::Paren && 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, false), .. }), |
| ] |
| if second_delim == &token::Paren && 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() { |
| with_default_globals(|| { |
| let tts = string_to_stream("fn a (b : i32) { b; }".to_string()); |
| |
| let expected = TokenStream::new(vec![ |
| TokenTree::token(token::Ident(kw::Fn, false), sp(0, 2)).into(), |
| TokenTree::token(token::Ident(Name::intern("a"), false), sp(3, 4)).into(), |
| TokenTree::Delimited( |
| DelimSpan::from_pair(sp(5, 6), sp(13, 14)), |
| token::DelimToken::Paren, |
| TokenStream::new(vec![ |
| TokenTree::token(token::Ident(Name::intern("b"), false), sp(6, 7)).into(), |
| TokenTree::token(token::Colon, sp(8, 9)).into(), |
| TokenTree::token(token::Ident(sym::i32, false), sp(10, 13)).into(), |
| ]).into(), |
| ).into(), |
| TokenTree::Delimited( |
| DelimSpan::from_pair(sp(15, 16), sp(20, 21)), |
| token::DelimToken::Brace, |
| TokenStream::new(vec![ |
| TokenTree::token(token::Ident(Name::intern("b"), false), sp(17, 18)).into(), |
| TokenTree::token(token::Semi, sp(18, 19)).into(), |
| ]).into(), |
| ).into() |
| ]); |
| |
| assert_eq!(tts, expected); |
| }) |
| } |
| |
| #[test] fn parse_use() { |
| with_default_globals(|| { |
| 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() { |
| with_default_globals(|| { |
| 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> crate::visit::Visitor<'a> for PatIdentVisitor { |
| fn visit_pat(&mut self, p: &'a ast::Pat) { |
| match p.node { |
| PatKind::Ident(_ , ref spannedident, _) => { |
| self.spans.push(spannedident.span.clone()); |
| } |
| _ => { |
| crate::visit::walk_pat(self, p); |
| } |
| } |
| } |
| } |
| let mut v = PatIdentVisitor { spans: Vec::new() }; |
| crate::visit::walk_item(&mut v, &item); |
| return v.spans; |
| } |
| |
| #[test] fn span_of_self_arg_pat_idents_are_correct() { |
| with_default_globals(|| { |
| |
| 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 () { |
| with_default_globals(|| { |
| // 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 () { |
| with_default_globals(|| { |
| 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() { |
| with_default_globals(|| { |
| let sess = ParseSess::new(FilePathMapping::empty()); |
| |
| 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, &sess) |
| .unwrap().unwrap(); |
| let doc = first_attr_value_str_by_name(&item.attrs, sym::doc).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, &sess) |
| .unwrap().unwrap(); |
| let docs = item.attrs.iter().filter(|a| a.path == sym::doc) |
| .map(|a| a.value_str().unwrap().to_string()).collect::<Vec<_>>(); |
| let b: &[_] = &["/// doc comment".to_string(), "/// line 2".to_string()]; |
| 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, &sess).unwrap().unwrap(); |
| let doc = first_attr_value_str_by_name(&item.attrs, sym::doc).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, sess: &ParseSess |
| ) -> PResult<'_, P<ast::Expr>> { |
| new_parser_from_source_str(sess, name, source).parse_expr() |
| } |
| |
| with_default_globals(|| { |
| let sess = ParseSess::new(FilePathMapping::empty()); |
| let expr = parse_expr_from_source_str(PathBuf::from("foo").into(), |
| "foo!( fn main() { body } )".to_string(), &sess).unwrap(); |
| |
| let tts: Vec<_> = match expr.node { |
| ast::ExprKind::Mac(ref mac) => mac.node.stream().trees().collect(), |
| _ => panic!("not a macro"), |
| }; |
| |
| let span = tts.iter().rev().next().unwrap().span(); |
| |
| match sess.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() { |
| with_default_globals(|| { |
| let sess = ParseSess::new(FilePathMapping::empty()); |
| let item = parse_item_from_source_str( |
| PathBuf::from("foo").into(), |
| "mod foo { struct S; mod this_does_not_exist; }".to_owned(), |
| &sess, |
| ).unwrap().unwrap(); |
| |
| if let ast::ItemKind::Mod(ref m) = item.node { |
| assert!(m.items.len() == 2); |
| } else { |
| panic!(); |
| } |
| }); |
| } |
| } |
