| // Copyright 2012 The Rust Project Developers. See the COPYRIGHT |
| // file at the top-level directory of this distribution and at |
| // http://rust-lang.org/COPYRIGHT. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| use ast; |
| use attr; |
| use syntax_pos::{DUMMY_SP, Span}; |
| use codemap::{self, ExpnInfo, NameAndSpan, MacroAttribute}; |
| use parse::token::{intern, InternedString, keywords}; |
| use parse::{token, ParseSess}; |
| use ptr::P; |
| |
| /// Craft a span that will be ignored by the stability lint's |
| /// call to codemap's is_internal check. |
| /// The expanded code uses the unstable `#[prelude_import]` attribute. |
| fn ignored_span(sess: &ParseSess, sp: Span) -> Span { |
| let info = ExpnInfo { |
| call_site: DUMMY_SP, |
| callee: NameAndSpan { |
| format: MacroAttribute(intern("std_inject")), |
| span: None, |
| allow_internal_unstable: true, |
| } |
| }; |
| let expn_id = sess.codemap().record_expansion(info); |
| let mut sp = sp; |
| sp.expn_id = expn_id; |
| return sp; |
| } |
| |
| pub fn no_core(krate: &ast::Crate) -> bool { |
| attr::contains_name(&krate.attrs, "no_core") |
| } |
| |
| pub fn no_std(krate: &ast::Crate) -> bool { |
| attr::contains_name(&krate.attrs, "no_std") || no_core(krate) |
| } |
| |
| pub fn maybe_inject_crates_ref(sess: &ParseSess, |
| mut krate: ast::Crate, |
| alt_std_name: Option<String>) |
| -> ast::Crate { |
| if no_core(&krate) { |
| return krate; |
| } |
| |
| let name = if no_std(&krate) { "core" } else { "std" }; |
| let crate_name = token::intern(&alt_std_name.unwrap_or(name.to_string())); |
| |
| krate.module.items.insert(0, P(ast::Item { |
| attrs: vec![attr::mk_attr_outer(attr::mk_attr_id(), |
| attr::mk_word_item(InternedString::new("macro_use")))], |
| vis: ast::Visibility::Inherited, |
| node: ast::ItemKind::ExternCrate(Some(crate_name)), |
| ident: token::str_to_ident(name), |
| id: ast::DUMMY_NODE_ID, |
| span: DUMMY_SP, |
| })); |
| |
| let span = ignored_span(sess, DUMMY_SP); |
| krate.module.items.insert(0, P(ast::Item { |
| attrs: vec![ast::Attribute { |
| node: ast::Attribute_ { |
| style: ast::AttrStyle::Outer, |
| value: P(ast::MetaItem { |
| node: ast::MetaItemKind::Word(token::intern_and_get_ident("prelude_import")), |
| span: span, |
| }), |
| id: attr::mk_attr_id(), |
| is_sugared_doc: false, |
| }, |
| span: span, |
| }], |
| vis: ast::Visibility::Inherited, |
| node: ast::ItemKind::Use(P(codemap::dummy_spanned(ast::ViewPathGlob(ast::Path { |
| global: false, |
| segments: vec![name, "prelude", "v1"].into_iter().map(|name| ast::PathSegment { |
| identifier: token::str_to_ident(name), |
| parameters: ast::PathParameters::none(), |
| }).collect(), |
| span: span, |
| })))), |
| id: ast::DUMMY_NODE_ID, |
| ident: keywords::Invalid.ident(), |
| span: span, |
| })); |
| |
| krate |
| } |