86 lines
2.6 KiB
Rust
86 lines
2.6 KiB
Rust
use rustc_ast as ast;
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use rustc_ast::ptr::P;
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use rustc_expand::base::{ExtCtxt, ResolverExpand};
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use rustc_expand::expand::ExpansionConfig;
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use rustc_session::Session;
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use rustc_span::edition::Edition;
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use rustc_span::hygiene::AstPass;
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use rustc_span::symbol::{kw, sym, Ident, Symbol};
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use rustc_span::DUMMY_SP;
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pub fn inject(
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mut krate: ast::Crate,
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resolver: &mut dyn ResolverExpand,
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sess: &Session,
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alt_std_name: Option<Symbol>,
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) -> ast::Crate {
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let rust_2018 = sess.parse_sess.edition >= Edition::Edition2018;
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// the first name in this list is the crate name of the crate with the prelude
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let names: &[Symbol] = if sess.contains_name(&krate.attrs, sym::no_core) {
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return krate;
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} else if sess.contains_name(&krate.attrs, sym::no_std) {
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if sess.contains_name(&krate.attrs, sym::compiler_builtins) {
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&[sym::core]
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} else {
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&[sym::core, sym::compiler_builtins]
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}
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} else {
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&[sym::std]
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};
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let expn_id = resolver.expansion_for_ast_pass(
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DUMMY_SP,
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AstPass::StdImports,
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&[sym::prelude_import],
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None,
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);
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let span = DUMMY_SP.with_def_site_ctxt(expn_id);
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let call_site = DUMMY_SP.with_call_site_ctxt(expn_id);
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let ecfg = ExpansionConfig::default("std_lib_injection".to_string());
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let cx = ExtCtxt::new(sess, ecfg, resolver, None);
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// .rev() to preserve ordering above in combination with insert(0, ...)
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for &name in names.iter().rev() {
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let ident = if rust_2018 { Ident::new(name, span) } else { Ident::new(name, call_site) };
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krate.module.items.insert(
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0,
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cx.item(
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span,
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ident,
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vec![cx.attribute(cx.meta_word(span, sym::macro_use))],
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ast::ItemKind::ExternCrate(alt_std_name),
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),
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);
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}
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// The crates have been injected, the assumption is that the first one is
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// the one with the prelude.
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let name = names[0];
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let import_path = if rust_2018 {
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[name, sym::prelude, sym::v1].iter().map(|symbol| Ident::new(*symbol, span)).collect()
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} else {
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[kw::PathRoot, name, sym::prelude, sym::v1]
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.iter()
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.map(|symbol| Ident::new(*symbol, span))
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.collect()
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};
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let use_item = cx.item(
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span,
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Ident::invalid(),
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vec![cx.attribute(cx.meta_word(span, sym::prelude_import))],
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ast::ItemKind::Use(P(ast::UseTree {
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prefix: cx.path(span, import_path),
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kind: ast::UseTreeKind::Glob,
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span,
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})),
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);
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krate.module.items.insert(0, use_item);
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krate
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}
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