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// Copyright 2012-2015 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.
//! Used by `rustc` when loading a crate with exported macros.
use creader::CrateReader;
use cstore::CStore;
use rustc::session::Session;
use std::collections::{HashSet, HashMap};
use syntax::parse::token;
use syntax::ast;
use syntax::attr;
use syntax::attr::AttrMetaMethods;
use syntax::ext;
use syntax_pos::Span;
pub struct MacroLoader<'a> {
sess: &'a Session,
reader: CrateReader<'a>,
}
impl<'a> MacroLoader<'a> {
pub fn new(sess: &'a Session, cstore: &'a CStore, crate_name: &str) -> MacroLoader<'a> {
MacroLoader {
sess: sess,
reader: CrateReader::new(sess, cstore, crate_name),
}
}
}
pub fn call_bad_macro_reexport(a: &Session, b: Span) {
span_err!(a, b, E0467, "bad macro reexport");
}
pub type MacroSelection = HashMap<token::InternedString, Span>;
impl<'a> ext::base::MacroLoader for MacroLoader<'a> {
fn load_crate(&mut self, extern_crate: &ast::Item, allows_macros: bool) -> Vec<ast::MacroDef> {
// Parse the attributes relating to macros.
let mut import = Some(HashMap::new()); // None => load all
let mut reexport = HashMap::new();
for attr in &extern_crate.attrs {
let mut used = true;
match &attr.name()[..] {
"macro_use" => {
let names = attr.meta_item_list();
if names.is_none() {
// no names => load all
import = None;
}
if let (Some(sel), Some(names)) = (import.as_mut(), names) {
for attr in names {
if let ast::MetaItemKind::Word(ref name) = attr.node {
sel.insert(name.clone(), attr.span);
} else {
span_err!(self.sess, attr.span, E0466, "bad macro import");
}
}
}
}
"macro_reexport" => {
let names = match attr.meta_item_list() {
Some(names) => names,
None => {
call_bad_macro_reexport(self.sess, attr.span);
continue;
}
};
for attr in names {
if let ast::MetaItemKind::Word(ref name) = attr.node {
reexport.insert(name.clone(), attr.span);
} else {
call_bad_macro_reexport(self.sess, attr.span);
}
}
}
_ => used = false,
}
if used {
attr::mark_used(attr);
}
}
self.load_macros(extern_crate, allows_macros, import, reexport)
}
}
impl<'a> MacroLoader<'a> {
fn load_macros<'b>(&mut self,
vi: &ast::Item,
allows_macros: bool,
import: Option<MacroSelection>,
reexport: MacroSelection)
-> Vec<ast::MacroDef> {
if let Some(sel) = import.as_ref() {
if sel.is_empty() && reexport.is_empty() {
return Vec::new();
}
}
if !allows_macros {
span_err!(self.sess, vi.span, E0468,
"an `extern crate` loading macros must be at the crate root");
return Vec::new();
}
let mut macros = Vec::new();
let mut seen = HashSet::new();
for mut def in self.reader.read_exported_macros(vi) {
let name = def.ident.name.as_str();
def.use_locally = match import.as_ref() {
None => true,
Some(sel) => sel.contains_key(&name),
};
def.export = reexport.contains_key(&name);
def.allow_internal_unstable = attr::contains_name(&def.attrs,
"allow_internal_unstable");
debug!("load_macros: loaded: {:?}", def);
macros.push(def);
seen.insert(name);
}
if let Some(sel) = import.as_ref() {
for (name, span) in sel {
if !seen.contains(&name) {
span_err!(self.sess, *span, E0469,
"imported macro not found");
}
}
}
for (name, span) in &reexport {
if !seen.contains(&name) {
span_err!(self.sess, *span, E0470,
"reexported macro not found");
}
}
macros
}
}
|
