1 use errors::{self, Diagnostic, DiagnosticBuilder};
4 use proc_macro::bridge::{server, TokenTree};
5 use proc_macro::{Delimiter, Level, LineColumn, Spacing};
7 use rustc_data_structures::sync::Lrc;
11 use syntax::ext::base::ExtCtxt;
12 use syntax::parse::lexer::comments;
13 use syntax::parse::{self, token, ParseSess};
14 use syntax::tokenstream::{self, DelimSpan, IsJoint::*, TokenStream, TreeAndJoint};
15 use syntax_pos::hygiene::{SyntaxContext, Transparency};
16 use syntax_pos::symbol::{keywords, Symbol};
17 use syntax_pos::{BytePos, FileName, MultiSpan, Pos, SourceFile, Span};
19 trait FromInternal<T> {
20 fn from_internal(x: T) -> Self;
24 fn to_internal(self) -> T;
27 impl FromInternal<token::DelimToken> for Delimiter {
28 fn from_internal(delim: token::DelimToken) -> Delimiter {
30 token::Paren => Delimiter::Parenthesis,
31 token::Brace => Delimiter::Brace,
32 token::Bracket => Delimiter::Bracket,
33 token::NoDelim => Delimiter::None,
38 impl ToInternal<token::DelimToken> for Delimiter {
39 fn to_internal(self) -> token::DelimToken {
41 Delimiter::Parenthesis => token::Paren,
42 Delimiter::Brace => token::Brace,
43 Delimiter::Bracket => token::Bracket,
44 Delimiter::None => token::NoDelim,
49 impl FromInternal<(TreeAndJoint, &'_ ParseSess, &'_ mut Vec<Self>)>
50 for TokenTree<Group, Punct, Ident, Literal>
52 fn from_internal(((tree, is_joint), sess, stack): (TreeAndJoint, &ParseSess, &mut Vec<Self>))
54 use syntax::parse::token::*;
56 let joint = is_joint == Joint;
57 let (span, token) = match tree {
58 tokenstream::TokenTree::Delimited(span, delim, tts) => {
59 let delimiter = Delimiter::from_internal(delim);
60 return TokenTree::Group(Group {
66 tokenstream::TokenTree::Token(span, token) => (span, token),
70 ($ty:ident { $($field:ident $(: $value:expr)*),+ $(,)* }) => (
71 TokenTree::$ty(self::$ty {
72 $($field $(: $value)*,)*
76 ($ty:ident::$method:ident($($value:expr),*)) => (
77 TokenTree::$ty(self::$ty::$method($($value,)* span))
82 tt!(Punct::new($a, joint))
84 ($a:expr, $b:expr) => {{
85 stack.push(tt!(Punct::new($b, joint)));
86 tt!(Punct::new($a, true))
88 ($a:expr, $b:expr, $c:expr) => {{
89 stack.push(tt!(Punct::new($c, joint)));
90 stack.push(tt!(Punct::new($b, true)));
91 tt!(Punct::new($a, true))
99 EqEq => op!('=', '='),
103 AndAnd => op!('&', '&'),
104 OrOr => op!('|', '|'),
107 BinOp(Plus) => op!('+'),
108 BinOp(Minus) => op!('-'),
109 BinOp(Star) => op!('*'),
110 BinOp(Slash) => op!('/'),
111 BinOp(Percent) => op!('%'),
112 BinOp(Caret) => op!('^'),
113 BinOp(And) => op!('&'),
114 BinOp(Or) => op!('|'),
115 BinOp(Shl) => op!('<', '<'),
116 BinOp(Shr) => op!('>', '>'),
117 BinOpEq(Plus) => op!('+', '='),
118 BinOpEq(Minus) => op!('-', '='),
119 BinOpEq(Star) => op!('*', '='),
120 BinOpEq(Slash) => op!('/', '='),
121 BinOpEq(Percent) => op!('%', '='),
122 BinOpEq(Caret) => op!('^', '='),
123 BinOpEq(And) => op!('&', '='),
124 BinOpEq(Or) => op!('|', '='),
125 BinOpEq(Shl) => op!('<', '<', '='),
126 BinOpEq(Shr) => op!('>', '>', '='),
129 DotDot => op!('.', '.'),
130 DotDotDot => op!('.', '.', '.'),
131 DotDotEq => op!('.', '.', '='),
135 ModSep => op!(':', ':'),
136 RArrow => op!('-', '>'),
137 LArrow => op!('<', '-'),
138 FatArrow => op!('=', '>'),
141 Question => op!('?'),
142 SingleQuote => op!('\''),
144 Ident(ident, false) if ident.name == keywords::DollarCrate.name() =>
145 tt!(Ident::dollar_crate()),
146 Ident(ident, is_raw) => tt!(Ident::new(ident.name, is_raw)),
148 let ident = ident.without_first_quote();
149 stack.push(tt!(Ident::new(ident.name, false)));
150 tt!(Punct::new('\'', true))
152 Literal(lit, suffix) => tt!(Literal { lit, suffix }),
154 let style = comments::doc_comment_style(&c.as_str());
155 let stripped = comments::strip_doc_comment_decoration(&c.as_str());
156 let mut escaped = String::new();
157 for ch in stripped.chars() {
158 escaped.extend(ch.escape_debug());
161 Ident(ast::Ident::new(Symbol::intern("doc"), span), false),
163 Literal(Lit::Str_(Symbol::intern(&escaped)), None),
166 .map(|token| tokenstream::TokenTree::Token(span, token))
168 stack.push(TokenTree::Group(Group {
169 delimiter: Delimiter::Bracket,
171 span: DelimSpan::from_single(span),
173 if style == ast::AttrStyle::Inner {
174 stack.push(tt!(Punct::new('!', false)));
176 tt!(Punct::new('#', false))
180 let stream = token.interpolated_to_tokenstream(sess, span);
181 TokenTree::Group(Group {
182 delimiter: Delimiter::None,
184 span: DelimSpan::from_single(span),
188 OpenDelim(..) | CloseDelim(..) => unreachable!(),
189 Whitespace | Comment | Shebang(..) | Eof => unreachable!(),
194 impl ToInternal<TokenStream> for TokenTree<Group, Punct, Ident, Literal> {
195 fn to_internal(self) -> TokenStream {
196 use syntax::parse::token::*;
198 let (ch, joint, span) = match self {
199 TokenTree::Punct(Punct { ch, joint, span }) => (ch, joint, span),
200 TokenTree::Group(Group {
205 return tokenstream::TokenTree::Delimited(
207 delimiter.to_internal(),
212 TokenTree::Ident(self::Ident { sym, is_raw, span }) => {
213 let token = Ident(ast::Ident::new(sym, span), is_raw);
214 return tokenstream::TokenTree::Token(span, token).into();
216 TokenTree::Literal(self::Literal {
217 lit: Lit::Integer(ref a),
220 }) if a.as_str().starts_with("-") => {
221 let minus = BinOp(BinOpToken::Minus);
222 let integer = Symbol::intern(&a.as_str()[1..]);
223 let integer = Literal(Lit::Integer(integer), suffix);
224 let a = tokenstream::TokenTree::Token(span, minus);
225 let b = tokenstream::TokenTree::Token(span, integer);
226 return vec![a, b].into_iter().collect();
228 TokenTree::Literal(self::Literal {
229 lit: Lit::Float(ref a),
232 }) if a.as_str().starts_with("-") => {
233 let minus = BinOp(BinOpToken::Minus);
234 let float = Symbol::intern(&a.as_str()[1..]);
235 let float = Literal(Lit::Float(float), suffix);
236 let a = tokenstream::TokenTree::Token(span, minus);
237 let b = tokenstream::TokenTree::Token(span, float);
238 return vec![a, b].into_iter().collect();
240 TokenTree::Literal(self::Literal { lit, suffix, span }) => {
241 return tokenstream::TokenTree::Token(span, Literal(lit, suffix)).into()
245 let token = match ch {
255 '%' => BinOp(Percent),
271 let tree = tokenstream::TokenTree::Token(span, token);
272 TokenStream::Tree(tree, if joint { Joint } else { NonJoint })
276 impl ToInternal<errors::Level> for Level {
277 fn to_internal(self) -> errors::Level {
279 Level::Error => errors::Level::Error,
280 Level::Warning => errors::Level::Warning,
281 Level::Note => errors::Level::Note,
282 Level::Help => errors::Level::Help,
283 _ => unreachable!("unknown proc_macro::Level variant: {:?}", self),
289 pub struct TokenStreamIter {
290 cursor: tokenstream::Cursor,
291 stack: Vec<TokenTree<Group, Punct, Ident, Literal>>,
296 delimiter: Delimiter,
301 #[derive(Copy, Clone, PartialEq, Eq, Hash)]
304 // NB. not using `Spacing` here because it doesn't implement `Hash`.
310 fn new(ch: char, joint: bool, span: Span) -> Punct {
311 const LEGAL_CHARS: &[char] = &['=', '<', '>', '!', '~', '+', '-', '*', '/', '%', '^',
312 '&', '|', '@', '.', ',', ';', ':', '#', '$', '?', '\''];
313 if !LEGAL_CHARS.contains(&ch) {
314 panic!("unsupported character `{:?}`", ch)
316 Punct { ch, joint, span }
320 #[derive(Copy, Clone, PartialEq, Eq, Hash)]
328 fn is_valid(string: &str) -> bool {
329 let mut chars = string.chars();
330 if let Some(start) = chars.next() {
331 (start == '_' || start.is_xid_start())
332 && chars.all(|cont| cont == '_' || cont.is_xid_continue())
337 fn new(sym: Symbol, is_raw: bool, span: Span) -> Ident {
338 let string = sym.as_str().get();
339 if !Self::is_valid(string) {
340 panic!("`{:?}` is not a valid identifier", string)
343 let normalized_sym = Symbol::intern(string);
344 if normalized_sym == keywords::Underscore.name() ||
345 ast::Ident::with_empty_ctxt(normalized_sym).is_path_segment_keyword() {
346 panic!("`{:?}` is not a valid raw identifier", string)
349 Ident { sym, is_raw, span }
351 fn dollar_crate(span: Span) -> Ident {
352 // `$crate` is accepted as an ident only if it comes from the compiler.
353 Ident { sym: keywords::DollarCrate.name(), is_raw: false, span }
357 // FIXME(eddyb) `Literal` should not expose internal `Debug` impls.
358 #[derive(Clone, Debug)]
361 suffix: Option<Symbol>,
365 pub(crate) struct Rustc<'a> {
372 pub fn new(cx: &'a ExtCtxt) -> Self {
373 // No way to determine def location for a proc macro right now, so use call location.
374 let location = cx.current_expansion.mark.expn_info().unwrap().call_site;
375 let to_span = |transparency| {
377 SyntaxContext::empty()
378 .apply_mark_with_transparency(cx.current_expansion.mark, transparency),
383 def_site: to_span(Transparency::Opaque),
384 call_site: to_span(Transparency::Transparent),
389 impl server::Types for Rustc<'_> {
390 type TokenStream = TokenStream;
391 type TokenStreamBuilder = tokenstream::TokenStreamBuilder;
392 type TokenStreamIter = TokenStreamIter;
396 type Literal = Literal;
397 type SourceFile = Lrc<SourceFile>;
398 type MultiSpan = Vec<Span>;
399 type Diagnostic = Diagnostic;
403 impl server::TokenStream for Rustc<'_> {
404 fn new(&mut self) -> Self::TokenStream {
407 fn is_empty(&mut self, stream: &Self::TokenStream) -> bool {
410 fn from_str(&mut self, src: &str) -> Self::TokenStream {
411 parse::parse_stream_from_source_str(
412 FileName::proc_macro_source_code(src.clone()),
415 Some(self.call_site),
418 fn to_string(&mut self, stream: &Self::TokenStream) -> String {
423 tree: TokenTree<Self::Group, Self::Punct, Self::Ident, Self::Literal>,
424 ) -> Self::TokenStream {
427 fn into_iter(&mut self, stream: Self::TokenStream) -> Self::TokenStreamIter {
429 cursor: stream.trees(),
435 impl server::TokenStreamBuilder for Rustc<'_> {
436 fn new(&mut self) -> Self::TokenStreamBuilder {
437 tokenstream::TokenStreamBuilder::new()
439 fn push(&mut self, builder: &mut Self::TokenStreamBuilder, stream: Self::TokenStream) {
440 builder.push(stream);
442 fn build(&mut self, builder: Self::TokenStreamBuilder) -> Self::TokenStream {
447 impl server::TokenStreamIter for Rustc<'_> {
450 iter: &mut Self::TokenStreamIter,
451 ) -> Option<TokenTree<Self::Group, Self::Punct, Self::Ident, Self::Literal>> {
453 let tree = iter.stack.pop().or_else(|| {
454 let next = iter.cursor.next_with_joint()?;
455 Some(TokenTree::from_internal((next, self.sess, &mut iter.stack)))
457 // HACK: The condition "dummy span + group with empty delimiter" represents an AST
458 // fragment approximately converted into a token stream. This may happen, for
459 // example, with inputs to proc macro attributes, including derives. Such "groups"
460 // need to flattened during iteration over stream's token trees.
461 // Eventually this needs to be removed in favor of keeping original token trees
462 // and not doing the roundtrip through AST.
463 if let TokenTree::Group(ref group) = tree {
464 if group.delimiter == Delimiter::None && group.span.entire().is_dummy() {
465 iter.cursor.append(group.stream.clone());
474 impl server::Group for Rustc<'_> {
475 fn new(&mut self, delimiter: Delimiter, stream: Self::TokenStream) -> Self::Group {
479 span: DelimSpan::from_single(server::Span::call_site(self)),
482 fn delimiter(&mut self, group: &Self::Group) -> Delimiter {
485 fn stream(&mut self, group: &Self::Group) -> Self::TokenStream {
488 fn span(&mut self, group: &Self::Group) -> Self::Span {
491 fn span_open(&mut self, group: &Self::Group) -> Self::Span {
494 fn span_close(&mut self, group: &Self::Group) -> Self::Span {
497 fn set_span(&mut self, group: &mut Self::Group, span: Self::Span) {
498 group.span = DelimSpan::from_single(span);
502 impl server::Punct for Rustc<'_> {
503 fn new(&mut self, ch: char, spacing: Spacing) -> Self::Punct {
504 Punct::new(ch, spacing == Spacing::Joint, server::Span::call_site(self))
506 fn as_char(&mut self, punct: Self::Punct) -> char {
509 fn spacing(&mut self, punct: Self::Punct) -> Spacing {
516 fn span(&mut self, punct: Self::Punct) -> Self::Span {
519 fn with_span(&mut self, punct: Self::Punct, span: Self::Span) -> Self::Punct {
520 Punct { span, ..punct }
524 impl server::Ident for Rustc<'_> {
525 fn new(&mut self, string: &str, span: Self::Span, is_raw: bool) -> Self::Ident {
526 Ident::new(Symbol::intern(string), is_raw, span)
528 fn span(&mut self, ident: Self::Ident) -> Self::Span {
531 fn with_span(&mut self, ident: Self::Ident, span: Self::Span) -> Self::Ident {
532 Ident { span, ..ident }
536 impl server::Literal for Rustc<'_> {
537 // FIXME(eddyb) `Literal` should not expose internal `Debug` impls.
538 fn debug(&mut self, literal: &Self::Literal) -> String {
539 format!("{:?}", literal)
541 fn integer(&mut self, n: &str) -> Self::Literal {
543 lit: token::Lit::Integer(Symbol::intern(n)),
545 span: server::Span::call_site(self),
548 fn typed_integer(&mut self, n: &str, kind: &str) -> Self::Literal {
550 lit: token::Lit::Integer(Symbol::intern(n)),
551 suffix: Some(Symbol::intern(kind)),
552 span: server::Span::call_site(self),
555 fn float(&mut self, n: &str) -> Self::Literal {
557 lit: token::Lit::Float(Symbol::intern(n)),
559 span: server::Span::call_site(self),
562 fn f32(&mut self, n: &str) -> Self::Literal {
564 lit: token::Lit::Float(Symbol::intern(n)),
565 suffix: Some(Symbol::intern("f32")),
566 span: server::Span::call_site(self),
569 fn f64(&mut self, n: &str) -> Self::Literal {
571 lit: token::Lit::Float(Symbol::intern(n)),
572 suffix: Some(Symbol::intern("f64")),
573 span: server::Span::call_site(self),
576 fn string(&mut self, string: &str) -> Self::Literal {
577 let mut escaped = String::new();
578 for ch in string.chars() {
579 escaped.extend(ch.escape_debug());
582 lit: token::Lit::Str_(Symbol::intern(&escaped)),
584 span: server::Span::call_site(self),
587 fn character(&mut self, ch: char) -> Self::Literal {
588 let mut escaped = String::new();
589 escaped.extend(ch.escape_unicode());
591 lit: token::Lit::Char(Symbol::intern(&escaped)),
593 span: server::Span::call_site(self),
596 fn byte_string(&mut self, bytes: &[u8]) -> Self::Literal {
600 .flat_map(ascii::escape_default)
601 .map(Into::<char>::into)
602 .collect::<String>();
604 lit: token::Lit::ByteStr(Symbol::intern(&string)),
606 span: server::Span::call_site(self),
609 fn span(&mut self, literal: &Self::Literal) -> Self::Span {
612 fn set_span(&mut self, literal: &mut Self::Literal, span: Self::Span) {
617 literal: &Self::Literal,
620 ) -> Option<Self::Span> {
621 let span = literal.span;
622 let length = span.hi().to_usize() - span.lo().to_usize();
624 let start = match start {
625 Bound::Included(lo) => lo,
626 Bound::Excluded(lo) => lo + 1,
627 Bound::Unbounded => 0,
630 let end = match end {
631 Bound::Included(hi) => hi + 1,
632 Bound::Excluded(hi) => hi,
633 Bound::Unbounded => length,
636 // Bounds check the values, preventing addition overflow and OOB spans.
637 if start > u32::max_value() as usize
638 || end > u32::max_value() as usize
639 || (u32::max_value() - start as u32) < span.lo().to_u32()
640 || (u32::max_value() - end as u32) < span.lo().to_u32()
647 let new_lo = span.lo() + BytePos::from_usize(start);
648 let new_hi = span.lo() + BytePos::from_usize(end);
649 Some(span.with_lo(new_lo).with_hi(new_hi))
653 impl<'a> server::SourceFile for Rustc<'a> {
654 fn eq(&mut self, file1: &Self::SourceFile, file2: &Self::SourceFile) -> bool {
655 Lrc::ptr_eq(file1, file2)
657 fn path(&mut self, file: &Self::SourceFile) -> String {
659 FileName::Real(ref path) => path
661 .expect("non-UTF8 file path in `proc_macro::SourceFile::path`")
663 _ => file.name.to_string(),
666 fn is_real(&mut self, file: &Self::SourceFile) -> bool {
671 impl server::MultiSpan for Rustc<'_> {
672 fn new(&mut self) -> Self::MultiSpan {
675 fn push(&mut self, spans: &mut Self::MultiSpan, span: Self::Span) {
680 impl server::Diagnostic for Rustc<'_> {
681 fn new(&mut self, level: Level, msg: &str, spans: Self::MultiSpan) -> Self::Diagnostic {
682 let mut diag = Diagnostic::new(level.to_internal(), msg);
683 diag.set_span(MultiSpan::from_spans(spans));
688 diag: &mut Self::Diagnostic,
691 spans: Self::MultiSpan,
693 diag.sub(level.to_internal(), msg, MultiSpan::from_spans(spans), None);
695 fn emit(&mut self, diag: Self::Diagnostic) {
696 DiagnosticBuilder::new_diagnostic(&self.sess.span_diagnostic, diag).emit()
700 impl server::Span for Rustc<'_> {
701 fn debug(&mut self, span: Self::Span) -> String {
702 format!("{:?} bytes({}..{})", span.ctxt(), span.lo().0, span.hi().0)
704 fn def_site(&mut self) -> Self::Span {
707 fn call_site(&mut self) -> Self::Span {
710 fn source_file(&mut self, span: Self::Span) -> Self::SourceFile {
711 self.sess.source_map().lookup_char_pos(span.lo()).file
713 fn parent(&mut self, span: Self::Span) -> Option<Self::Span> {
714 span.ctxt().outer().expn_info().map(|i| i.call_site)
716 fn source(&mut self, span: Self::Span) -> Self::Span {
717 span.source_callsite()
719 fn start(&mut self, span: Self::Span) -> LineColumn {
720 let loc = self.sess.source_map().lookup_char_pos(span.lo());
723 column: loc.col.to_usize(),
726 fn end(&mut self, span: Self::Span) -> LineColumn {
727 let loc = self.sess.source_map().lookup_char_pos(span.hi());
730 column: loc.col.to_usize(),
733 fn join(&mut self, first: Self::Span, second: Self::Span) -> Option<Self::Span> {
734 let self_loc = self.sess.source_map().lookup_char_pos(first.lo());
735 let other_loc = self.sess.source_map().lookup_char_pos(second.lo());
737 if self_loc.file.name != other_loc.file.name {
741 Some(first.to(second))
743 fn resolved_at(&mut self, span: Self::Span, at: Self::Span) -> Self::Span {
744 span.with_ctxt(at.ctxt())