4 use rustc_ast::tokenstream::TokenStream;
5 use rustc_ast_pretty::pprust;
6 use rustc_expand::base::{self, *};
7 use rustc_expand::module::DirectoryOwnership;
8 use rustc_parse::{self, new_parser_from_file, parser::Parser};
9 use rustc_session::lint::builtin::INCOMPLETE_INCLUDE;
10 use rustc_span::symbol::Symbol;
11 use rustc_span::{self, Pos, Span};
13 use smallvec::SmallVec;
16 // These macros all relate to the file system; they either return
17 // the column/row/filename of the expression, or they include
18 // a given file into the current one.
20 /// line!(): expands to the current line number
25 ) -> Box<dyn base::MacResult + 'static> {
26 let sp = cx.with_def_site_ctxt(sp);
27 base::check_zero_tts(cx, sp, tts, "line!");
29 let topmost = cx.expansion_cause().unwrap_or(sp);
30 let loc = cx.source_map().lookup_char_pos(topmost.lo());
32 base::MacEager::expr(cx.expr_u32(topmost, loc.line as u32))
35 /* column!(): expands to the current column number */
40 ) -> Box<dyn base::MacResult + 'static> {
41 let sp = cx.with_def_site_ctxt(sp);
42 base::check_zero_tts(cx, sp, tts, "column!");
44 let topmost = cx.expansion_cause().unwrap_or(sp);
45 let loc = cx.source_map().lookup_char_pos(topmost.lo());
47 base::MacEager::expr(cx.expr_u32(topmost, loc.col.to_usize() as u32 + 1))
50 /// file!(): expands to the current filename */
51 /// The source_file (`loc.file`) contains a bunch more information we could spit
57 ) -> Box<dyn base::MacResult + 'static> {
58 let sp = cx.with_def_site_ctxt(sp);
59 base::check_zero_tts(cx, sp, tts, "file!");
61 let topmost = cx.expansion_cause().unwrap_or(sp);
62 let loc = cx.source_map().lookup_char_pos(topmost.lo());
63 base::MacEager::expr(cx.expr_str(topmost, Symbol::intern(&loc.file.name.to_string())))
66 pub fn expand_stringify(
70 ) -> Box<dyn base::MacResult + 'static> {
71 let sp = cx.with_def_site_ctxt(sp);
72 let s = pprust::tts_to_string(&tts);
73 base::MacEager::expr(cx.expr_str(sp, Symbol::intern(&s)))
80 ) -> Box<dyn base::MacResult + 'static> {
81 let sp = cx.with_def_site_ctxt(sp);
82 base::check_zero_tts(cx, sp, tts, "module_path!");
83 let mod_path = &cx.current_expansion.module.mod_path;
84 let string = mod_path.iter().map(|x| x.to_string()).collect::<Vec<String>>().join("::");
86 base::MacEager::expr(cx.expr_str(sp, Symbol::intern(&string)))
89 /// include! : parse the given file as an expr
90 /// This is generally a bad idea because it's going to behave
92 pub fn expand_include<'cx>(
93 cx: &'cx mut ExtCtxt<'_>,
96 ) -> Box<dyn base::MacResult + 'cx> {
97 let sp = cx.with_def_site_ctxt(sp);
98 let file = match get_single_str_from_tts(cx, sp, tts, "include!") {
100 None => return DummyResult::any(sp),
102 // The file will be added to the code map by the parser
103 let mut file = match cx.resolve_path(file, sp) {
107 return DummyResult::any(sp);
110 let p = new_parser_from_file(cx.parse_sess(), &file, Some(sp));
112 // If in the included file we have e.g., `mod bar;`,
113 // then the path of `bar.rs` should be relative to the directory of `file`.
114 // See https://github.com/rust-lang/rust/pull/69838/files#r395217057 for a discussion.
115 // `MacroExpander::fully_expand_fragment` later restores, so "stack discipline" is maintained.
117 cx.current_expansion.directory_ownership = DirectoryOwnership::Owned { relative: None };
118 let mod_path = cx.current_expansion.module.mod_path.clone();
119 cx.current_expansion.module = Rc::new(ModuleData { mod_path, directory: file });
121 struct ExpandResult<'a> {
123 node_id: ast::NodeId,
125 impl<'a> base::MacResult for ExpandResult<'a> {
126 fn make_expr(mut self: Box<ExpandResult<'a>>) -> Option<P<ast::Expr>> {
127 let r = base::parse_expr(&mut self.p)?;
128 if self.p.token != token::Eof {
129 self.p.sess.buffer_lint(
133 "include macro expected single expression in source",
139 fn make_items(mut self: Box<ExpandResult<'a>>) -> Option<SmallVec<[P<ast::Item>; 1]>> {
140 let mut ret = SmallVec::new();
141 while self.p.token != token::Eof {
142 match self.p.parse_item() {
147 Ok(Some(item)) => ret.push(item),
149 let token = pprust::token_to_string(&self.p.token);
150 let msg = format!("expected item, found `{}`", token);
151 self.p.struct_span_err(self.p.token.span, &msg).emit();
160 Box::new(ExpandResult { p, node_id: cx.resolver.lint_node_id(cx.current_expansion.id) })
163 // include_str! : read the given file, insert it as a literal string expr
164 pub fn expand_include_str(
165 cx: &mut ExtCtxt<'_>,
168 ) -> Box<dyn base::MacResult + 'static> {
169 let sp = cx.with_def_site_ctxt(sp);
170 let file = match get_single_str_from_tts(cx, sp, tts, "include_str!") {
172 None => return DummyResult::any(sp),
174 let file = match cx.resolve_path(file, sp) {
178 return DummyResult::any(sp);
181 match cx.source_map().load_binary_file(&file) {
182 Ok(bytes) => match std::str::from_utf8(&bytes) {
184 let interned_src = Symbol::intern(&src);
185 base::MacEager::expr(cx.expr_str(sp, interned_src))
188 cx.span_err(sp, &format!("{} wasn't a utf-8 file", file.display()));
193 cx.span_err(sp, &format!("couldn't read {}: {}", file.display(), e));
199 pub fn expand_include_bytes(
200 cx: &mut ExtCtxt<'_>,
203 ) -> Box<dyn base::MacResult + 'static> {
204 let sp = cx.with_def_site_ctxt(sp);
205 let file = match get_single_str_from_tts(cx, sp, tts, "include_bytes!") {
207 None => return DummyResult::any(sp),
209 let file = match cx.resolve_path(file, sp) {
213 return DummyResult::any(sp);
216 match cx.source_map().load_binary_file(&file) {
217 Ok(bytes) => base::MacEager::expr(cx.expr_lit(sp, ast::LitKind::ByteStr(bytes.into()))),
219 cx.span_err(sp, &format!("couldn't read {}: {}", file.display(), e));