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use rustc_ast as ast;
use rustc_ast::ptr::P;
use rustc_ast::token;
use rustc_ast::tokenstream::TokenStream;
use rustc_ast_pretty::pprust;
use rustc_expand::base::{self, *};
use rustc_expand::module::DirOwnership;
use rustc_parse::parser::{ForceCollect, Parser};
use rustc_parse::{self, new_parser_from_file};
use rustc_session::lint::builtin::INCOMPLETE_INCLUDE;
use rustc_span::symbol::Symbol;
use rustc_span::{self, Pos, Span};
use smallvec::SmallVec;
use std::rc::Rc;
// These macros all relate to the file system; they either return
// the column/row/filename of the expression, or they include
// a given file into the current one.
/// line!(): expands to the current line number
pub fn expand_line(
cx: &mut ExtCtxt<'_>,
sp: Span,
tts: TokenStream,
) -> Box<dyn base::MacResult + 'static> {
let sp = cx.with_def_site_ctxt(sp);
base::check_zero_tts(cx, sp, tts, "line!");
let topmost = cx.expansion_cause().unwrap_or(sp);
let loc = cx.source_map().lookup_char_pos(topmost.lo());
base::MacEager::expr(cx.expr_u32(topmost, loc.line as u32))
}
/* column!(): expands to the current column number */
pub fn expand_column(
cx: &mut ExtCtxt<'_>,
sp: Span,
tts: TokenStream,
) -> Box<dyn base::MacResult + 'static> {
let sp = cx.with_def_site_ctxt(sp);
base::check_zero_tts(cx, sp, tts, "column!");
let topmost = cx.expansion_cause().unwrap_or(sp);
let loc = cx.source_map().lookup_char_pos(topmost.lo());
base::MacEager::expr(cx.expr_u32(topmost, loc.col.to_usize() as u32 + 1))
}
/// file!(): expands to the current filename */
/// The source_file (`loc.file`) contains a bunch more information we could spit
/// out if we wanted.
pub fn expand_file(
cx: &mut ExtCtxt<'_>,
sp: Span,
tts: TokenStream,
) -> Box<dyn base::MacResult + 'static> {
let sp = cx.with_def_site_ctxt(sp);
base::check_zero_tts(cx, sp, tts, "file!");
let topmost = cx.expansion_cause().unwrap_or(sp);
let loc = cx.source_map().lookup_char_pos(topmost.lo());
base::MacEager::expr(
cx.expr_str(topmost, Symbol::intern(&loc.file.name.prefer_remapped().to_string_lossy())),
)
}
pub fn expand_stringify(
cx: &mut ExtCtxt<'_>,
sp: Span,
tts: TokenStream,
) -> Box<dyn base::MacResult + 'static> {
let sp = cx.with_def_site_ctxt(sp);
let s = pprust::tts_to_string(&tts);
base::MacEager::expr(cx.expr_str(sp, Symbol::intern(&s)))
}
pub fn expand_mod(
cx: &mut ExtCtxt<'_>,
sp: Span,
tts: TokenStream,
) -> Box<dyn base::MacResult + 'static> {
let sp = cx.with_def_site_ctxt(sp);
base::check_zero_tts(cx, sp, tts, "module_path!");
let mod_path = &cx.current_expansion.module.mod_path;
let string = mod_path.iter().map(|x| x.to_string()).collect::<Vec<String>>().join("::");
base::MacEager::expr(cx.expr_str(sp, Symbol::intern(&string)))
}
/// include! : parse the given file as an expr
/// This is generally a bad idea because it's going to behave
/// unhygienically.
pub fn expand_include<'cx>(
cx: &'cx mut ExtCtxt<'_>,
sp: Span,
tts: TokenStream,
) -> Box<dyn base::MacResult + 'cx> {
let sp = cx.with_def_site_ctxt(sp);
let Some(file) = get_single_str_from_tts(cx, sp, tts, "include!") else {
return DummyResult::any(sp);
};
// The file will be added to the code map by the parser
let file = match resolve_path(&cx.sess.parse_sess, file.as_str(), sp) {
Ok(f) => f,
Err(mut err) => {
err.emit();
return DummyResult::any(sp);
}
};
let p = new_parser_from_file(cx.parse_sess(), &file, Some(sp));
// If in the included file we have e.g., `mod bar;`,
// then the path of `bar.rs` should be relative to the directory of `file`.
// See https://github.com/rust-lang/rust/pull/69838/files#r395217057 for a discussion.
// `MacroExpander::fully_expand_fragment` later restores, so "stack discipline" is maintained.
let dir_path = file.parent().unwrap_or(&file).to_owned();
cx.current_expansion.module = Rc::new(cx.current_expansion.module.with_dir_path(dir_path));
cx.current_expansion.dir_ownership = DirOwnership::Owned { relative: None };
struct ExpandResult<'a> {
p: Parser<'a>,
node_id: ast::NodeId,
}
impl<'a> base::MacResult for ExpandResult<'a> {
fn make_expr(mut self: Box<ExpandResult<'a>>) -> Option<P<ast::Expr>> {
let r = base::parse_expr(&mut self.p)?;
if self.p.token != token::Eof {
self.p.sess.buffer_lint(
&INCOMPLETE_INCLUDE,
self.p.token.span,
self.node_id,
"include macro expected single expression in source",
);
}
Some(r)
}
fn make_items(mut self: Box<ExpandResult<'a>>) -> Option<SmallVec<[P<ast::Item>; 1]>> {
let mut ret = SmallVec::new();
loop {
match self.p.parse_item(ForceCollect::No) {
Err(mut err) => {
err.emit();
break;
}
Ok(Some(item)) => ret.push(item),
Ok(None) => {
if self.p.token != token::Eof {
let token = pprust::token_to_string(&self.p.token);
let msg = format!("expected item, found `{}`", token);
self.p.struct_span_err(self.p.token.span, &msg).emit();
}
break;
}
}
}
Some(ret)
}
}
Box::new(ExpandResult { p, node_id: cx.current_expansion.lint_node_id })
}
// include_str! : read the given file, insert it as a literal string expr
pub fn expand_include_str(
cx: &mut ExtCtxt<'_>,
sp: Span,
tts: TokenStream,
) -> Box<dyn base::MacResult + 'static> {
let sp = cx.with_def_site_ctxt(sp);
let Some(file) = get_single_str_from_tts(cx, sp, tts, "include_str!") else {
return DummyResult::any(sp);
};
let file = match resolve_path(&cx.sess.parse_sess, file.as_str(), sp) {
Ok(f) => f,
Err(mut err) => {
err.emit();
return DummyResult::any(sp);
}
};
match cx.source_map().load_binary_file(&file) {
Ok(bytes) => match std::str::from_utf8(&bytes) {
Ok(src) => {
let interned_src = Symbol::intern(&src);
base::MacEager::expr(cx.expr_str(sp, interned_src))
}
Err(_) => {
cx.span_err(sp, &format!("{} wasn't a utf-8 file", file.display()));
DummyResult::any(sp)
}
},
Err(e) => {
cx.span_err(sp, &format!("couldn't read {}: {}", file.display(), e));
DummyResult::any(sp)
}
}
}
pub fn expand_include_bytes(
cx: &mut ExtCtxt<'_>,
sp: Span,
tts: TokenStream,
) -> Box<dyn base::MacResult + 'static> {
let sp = cx.with_def_site_ctxt(sp);
let Some(file) = get_single_str_from_tts(cx, sp, tts, "include_bytes!") else {
return DummyResult::any(sp);
};
let file = match resolve_path(&cx.sess.parse_sess, file.as_str(), sp) {
Ok(f) => f,
Err(mut err) => {
err.emit();
return DummyResult::any(sp);
}
};
match cx.source_map().load_binary_file(&file) {
Ok(bytes) => base::MacEager::expr(cx.expr_byte_str(sp, bytes)),
Err(e) => {
cx.span_err(sp, &format!("couldn't read {}: {}", file.display(), e));
DummyResult::any(sp)
}
}
}
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