128 lines
4.1 KiB
Rust
128 lines
4.1 KiB
Rust
// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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use driver::session::Session;
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use std::vec;
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use syntax::ast;
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use syntax::attr;
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use syntax::codemap::dummy_sp;
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use syntax::codemap;
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use syntax::fold;
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static STD_VERSION: &'static str = "0.8-pre";
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pub fn maybe_inject_libstd_ref(sess: Session, crate: @ast::crate)
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-> @ast::crate {
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if use_std(crate) {
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inject_libstd_ref(sess, crate)
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} else {
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crate
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}
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}
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fn use_std(crate: &ast::crate) -> bool {
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!attr::attrs_contains_name(crate.node.attrs, "no_std")
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}
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fn no_prelude(attrs: &[ast::attribute]) -> bool {
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attr::attrs_contains_name(attrs, "no_implicit_prelude")
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}
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fn inject_libstd_ref(sess: Session, crate: &ast::crate) -> @ast::crate {
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fn spanned<T:Copy>(x: T) -> codemap::spanned<T> {
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codemap::spanned { node: x, span: dummy_sp() }
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}
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let precursor = @fold::AstFoldFns {
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fold_crate: |crate, span, fld| {
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let n1 = sess.next_node_id();
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let vi1 = ast::view_item {
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node: ast::view_item_extern_mod(
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sess.ident_of("std"), ~[], n1),
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attrs: ~[
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spanned(ast::attribute_ {
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style: ast::attr_inner,
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value: @spanned(ast::meta_name_value(
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@"vers",
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spanned(ast::lit_str(STD_VERSION.to_managed()))
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)),
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is_sugared_doc: false
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})
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],
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vis: ast::private,
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span: dummy_sp()
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};
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let vis = vec::append(~[vi1], crate.module.view_items);
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let mut new_module = ast::_mod {
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view_items: vis,
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..crate.module.clone()
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};
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if !no_prelude(crate.attrs) {
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// only add `use std::prelude::*;` if there wasn't a
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// `#[no_implicit_prelude];` at the crate level.
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new_module = fld.fold_mod(&new_module);
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}
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// FIXME #2543: Bad copy.
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let new_crate = ast::crate_ {
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module: new_module,
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..(*crate).clone()
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};
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(new_crate, span)
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},
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fold_item: |item, fld| {
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if !no_prelude(item.attrs) {
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// only recur if there wasn't `#[no_implicit_prelude];`
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// on this item, i.e. this means that the prelude is not
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// implicitly imported though the whole subtree
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fold::noop_fold_item(item, fld)
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} else {
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Some(item)
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}
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},
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fold_mod: |module, fld| {
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let n2 = sess.next_node_id();
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let prelude_path = ast::Path {
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span: dummy_sp(),
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global: false,
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idents: ~[
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sess.ident_of("std"),
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sess.ident_of("prelude")
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],
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rp: None,
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types: ~[]
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};
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let vp = @spanned(ast::view_path_glob(prelude_path, n2));
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let vi2 = ast::view_item { node: ast::view_item_use(~[vp]),
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attrs: ~[],
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vis: ast::private,
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span: dummy_sp() };
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let vis = vec::append(~[vi2], module.view_items);
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// FIXME #2543: Bad copy.
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let new_module = ast::_mod {
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view_items: vis,
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..(*module).clone()
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};
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fold::noop_fold_mod(&new_module, fld)
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},
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..*fold::default_ast_fold()
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};
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let fold = fold::make_fold(precursor);
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@fold.fold_crate(crate)
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}
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