2015-03-15 16:44:19 -05:00
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// Copyright 2015 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 self::ImportDirectiveSubclass::*;
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use Module;
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use Namespace::{self, TypeNS, ValueNS};
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use {NameBinding, NameBindingKind, PrivacyError};
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use ResolveResult;
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use ResolveResult::*;
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use Resolver;
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use UseLexicalScopeFlag::DontUseLexicalScope;
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use {names_to_string, module_to_string};
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use {resolve_error, ResolutionError};
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use rustc::ty;
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use rustc::lint;
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use rustc::hir::def::*;
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2015-08-16 05:32:28 -05:00
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use syntax::ast::{NodeId, Name};
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use syntax::attr::AttrMetaMethods;
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use syntax::codemap::Span;
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use syntax::util::lev_distance::find_best_match_for_name;
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use std::cell::{Cell, RefCell};
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/// Contains data for specific types of import directives.
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#[derive(Clone, Debug)]
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pub enum ImportDirectiveSubclass {
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SingleImport {
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target: Name,
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source: Name,
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type_determined: Cell<bool>,
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value_determined: Cell<bool>,
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},
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GlobImport { is_prelude: bool },
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}
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impl ImportDirectiveSubclass {
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pub fn single(target: Name, source: Name) -> Self {
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SingleImport {
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target: target,
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source: source,
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type_determined: Cell::new(false),
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value_determined: Cell::new(false),
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}
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}
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}
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/// One import directive.
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#[derive(Debug,Clone)]
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pub struct ImportDirective<'a> {
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pub id: NodeId,
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module_path: Vec<Name>,
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target_module: Cell<Option<Module<'a>>>, // the resolution of `module_path`
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subclass: ImportDirectiveSubclass,
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span: Span,
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vis: ty::Visibility, // see note in ImportResolutionPerNamespace about how to use this
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}
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impl<'a> ImportDirective<'a> {
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// Given the binding to which this directive resolves in a particular namespace,
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// this returns the binding for the name this directive defines in that namespace.
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fn import(&'a self, binding: &'a NameBinding<'a>, privacy_error: Option<Box<PrivacyError<'a>>>)
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-> NameBinding<'a> {
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NameBinding {
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kind: NameBindingKind::Import {
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binding: binding,
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directive: self,
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privacy_error: privacy_error,
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},
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span: Some(self.span),
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vis: self.vis,
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}
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}
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pub fn is_glob(&self) -> bool {
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match self.subclass { ImportDirectiveSubclass::GlobImport { .. } => true, _ => false }
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}
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}
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#[derive(Clone, Default)]
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/// Records information about the resolution of a name in a namespace of a module.
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pub struct NameResolution<'a> {
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/// The single imports that define the name in the namespace.
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single_imports: SingleImports<'a>,
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/// The least shadowable known binding for this name, or None if there are no known bindings.
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pub binding: Option<&'a NameBinding<'a>>,
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duplicate_globs: Vec<&'a NameBinding<'a>>,
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}
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#[derive(Clone, Debug)]
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enum SingleImports<'a> {
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/// No single imports can define the name in the namespace.
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None,
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/// Only the given single import can define the name in the namespace.
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MaybeOne(&'a ImportDirective<'a>),
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/// At least one single import will define the name in the namespace.
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AtLeastOne,
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}
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impl<'a> Default for SingleImports<'a> {
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fn default() -> Self {
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SingleImports::None
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}
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}
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impl<'a> SingleImports<'a> {
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fn add_directive(&mut self, directive: &'a ImportDirective<'a>) {
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match *self {
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SingleImports::None => *self = SingleImports::MaybeOne(directive),
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// If two single imports can define the name in the namespace, we can assume that at
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// least one of them will define it since otherwise both would have to define only one
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// namespace, leading to a duplicate error.
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SingleImports::MaybeOne(_) => *self = SingleImports::AtLeastOne,
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SingleImports::AtLeastOne => {}
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};
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}
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fn directive_failed(&mut self) {
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match *self {
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SingleImports::None => unreachable!(),
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SingleImports::MaybeOne(_) => *self = SingleImports::None,
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SingleImports::AtLeastOne => {}
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}
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}
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}
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impl<'a> NameResolution<'a> {
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fn try_define(&mut self, binding: &'a NameBinding<'a>) -> Result<(), &'a NameBinding<'a>> {
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if let Some(old_binding) = self.binding {
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if binding.is_glob_import() {
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self.duplicate_globs.push(binding);
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} else if old_binding.is_glob_import() {
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self.duplicate_globs.push(old_binding);
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self.binding = Some(binding);
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} else {
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return Err(old_binding);
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}
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} else {
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self.binding = Some(binding);
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}
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Ok(())
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}
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// Returns the binding for the name if it is known or None if it not known.
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fn binding(&self) -> Option<&'a NameBinding<'a>> {
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self.binding.and_then(|binding| match self.single_imports {
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SingleImports::None => Some(binding),
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_ if !binding.is_glob_import() => Some(binding),
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_ => None, // The binding could be shadowed by a single import, so it is not known.
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})
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}
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// Returns Some(the resolution of the name), or None if the resolution depends
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// on whether more globs can define the name.
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fn try_result(&self, ns: Namespace, allow_private_imports: bool)
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-> Option<ResolveResult<&'a NameBinding<'a>>> {
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match self.binding {
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Some(binding) if !binding.is_glob_import() =>
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return Some(Success(binding)),
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_ => {} // Items and single imports are not shadowable
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};
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// Check if a single import can still define the name.
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match self.single_imports {
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SingleImports::None => {},
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SingleImports::AtLeastOne => return Some(Indeterminate),
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SingleImports::MaybeOne(directive) => {
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// If (1) we don't allow private imports, (2) no public single import can define
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// the name, and (3) no public glob has defined the name, the resolution depends
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// on whether more globs can define the name.
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if !allow_private_imports && directive.vis != ty::Visibility::Public &&
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!self.binding.map(NameBinding::is_pseudo_public).unwrap_or(false) {
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return None;
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}
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let target_module = match directive.target_module.get() {
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Some(target_module) => target_module,
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None => return Some(Indeterminate),
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};
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let name = match directive.subclass {
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SingleImport { source, .. } => source,
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GlobImport { .. } => unreachable!(),
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};
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match target_module.resolve_name(name, ns, false) {
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Failed(_) => {}
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_ => return Some(Indeterminate),
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}
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}
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}
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self.binding.map(Success)
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}
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fn report_conflicts<F: FnMut(&NameBinding, &NameBinding)>(&self, mut report: F) {
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let binding = match self.binding {
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Some(binding) => binding,
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None => return,
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};
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for duplicate_glob in self.duplicate_globs.iter() {
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// FIXME #31337: We currently allow items to shadow glob-imported re-exports.
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if !binding.is_import() {
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if let NameBindingKind::Import { binding, .. } = duplicate_glob.kind {
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if binding.is_import() { continue }
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}
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}
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report(duplicate_glob, binding);
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}
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}
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}
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impl<'a> ::ModuleS<'a> {
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fn resolution(&self, name: Name, ns: Namespace) -> &'a RefCell<NameResolution<'a>> {
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*self.resolutions.borrow_mut().entry((name, ns))
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.or_insert_with(|| self.arenas.alloc_name_resolution())
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}
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pub fn resolve_name(&self, name: Name, ns: Namespace, allow_private_imports: bool)
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-> ResolveResult<&'a NameBinding<'a>> {
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let resolution = self.resolution(name, ns);
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let resolution = match resolution.borrow_state() {
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::std::cell::BorrowState::Unused => resolution.borrow_mut(),
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_ => return Failed(None), // This happens when there is a cycle of imports
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};
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if let Some(result) = resolution.try_result(ns, allow_private_imports) {
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// If the resolution doesn't depend on glob definability, check privacy and return.
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return result.and_then(|binding| {
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let allowed = allow_private_imports || !binding.is_import() ||
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binding.is_pseudo_public();
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if allowed { Success(binding) } else { Failed(None) }
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});
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}
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2016-03-17 06:05:09 -05:00
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// Check if the globs are determined
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for directive in self.globs.borrow().iter() {
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if !allow_private_imports && directive.vis != ty::Visibility::Public { continue }
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match directive.target_module.get() {
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None => return Indeterminate,
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Some(target_module) => match target_module.resolve_name(name, ns, false) {
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Indeterminate => return Indeterminate,
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_ => {}
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}
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}
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}
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Failed(None)
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}
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// Invariant: this may not be called until import resolution is complete.
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pub fn resolve_name_in_lexical_scope(&self, name: Name, ns: Namespace)
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-> Option<&'a NameBinding<'a>> {
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self.resolution(name, ns).borrow().binding
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.or_else(|| self.prelude.borrow().and_then(|prelude| {
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prelude.resolve_name(name, ns, false).success()
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}))
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}
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// Define the name or return the existing binding if there is a collision.
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pub fn try_define_child(&self, name: Name, ns: Namespace, binding: NameBinding<'a>)
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-> Result<(), &'a NameBinding<'a>> {
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self.update_resolution(name, ns, |resolution| {
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resolution.try_define(self.arenas.alloc_name_binding(binding))
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})
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}
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pub fn add_import_directive(&self,
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module_path: Vec<Name>,
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subclass: ImportDirectiveSubclass,
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span: Span,
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id: NodeId,
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vis: ty::Visibility) {
|
2016-03-17 03:43:17 -05:00
|
|
|
let directive = self.arenas.alloc_import_directive(ImportDirective {
|
|
|
|
module_path: module_path,
|
|
|
|
target_module: Cell::new(None),
|
|
|
|
subclass: subclass,
|
|
|
|
span: span,
|
|
|
|
id: id,
|
2016-04-09 18:19:53 -05:00
|
|
|
vis: vis,
|
2016-03-17 03:43:17 -05:00
|
|
|
});
|
|
|
|
|
2016-03-17 06:05:09 -05:00
|
|
|
self.unresolved_imports.borrow_mut().push(directive);
|
2016-03-17 03:43:17 -05:00
|
|
|
match directive.subclass {
|
|
|
|
SingleImport { target, .. } => {
|
|
|
|
for &ns in &[ValueNS, TypeNS] {
|
2016-03-30 17:21:56 -05:00
|
|
|
self.resolution(target, ns).borrow_mut().single_imports
|
|
|
|
.add_directive(directive);
|
2016-03-17 03:43:17 -05:00
|
|
|
}
|
|
|
|
}
|
2016-03-17 06:05:09 -05:00
|
|
|
// We don't add prelude imports to the globs since they only affect lexical scopes,
|
|
|
|
// which are not relevant to import resolution.
|
2016-04-17 14:23:25 -05:00
|
|
|
GlobImport { is_prelude: true } => {}
|
|
|
|
GlobImport { .. } => self.globs.borrow_mut().push(directive),
|
2016-03-17 06:05:09 -05:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2016-02-15 21:54:14 -06:00
|
|
|
// Use `update` to mutate the resolution for the name.
|
|
|
|
// If the resolution becomes a success, define it in the module's glob importers.
|
|
|
|
fn update_resolution<T, F>(&self, name: Name, ns: Namespace, update: F) -> T
|
|
|
|
where F: FnOnce(&mut NameResolution<'a>) -> T
|
|
|
|
{
|
2016-04-11 13:30:48 -05:00
|
|
|
// Ensure that `resolution` isn't borrowed during `define_in_glob_importers`,
|
|
|
|
// where it might end up getting re-defined via a glob cycle.
|
2016-04-07 17:14:44 -05:00
|
|
|
let (new_binding, t) = {
|
|
|
|
let mut resolution = &mut *self.resolution(name, ns).borrow_mut();
|
|
|
|
let was_known = resolution.binding().is_some();
|
2016-02-15 21:54:14 -06:00
|
|
|
|
2016-04-07 17:14:44 -05:00
|
|
|
let t = update(resolution);
|
|
|
|
|
|
|
|
if was_known { return t; }
|
|
|
|
match resolution.binding() {
|
|
|
|
Some(binding) => (binding, t),
|
|
|
|
None => return t,
|
2016-02-07 17:58:14 -06:00
|
|
|
}
|
2016-04-07 17:14:44 -05:00
|
|
|
};
|
|
|
|
|
|
|
|
self.define_in_glob_importers(name, ns, new_binding);
|
2016-02-15 21:54:14 -06:00
|
|
|
t
|
|
|
|
}
|
2016-02-07 17:58:14 -06:00
|
|
|
|
2016-02-15 21:54:14 -06:00
|
|
|
fn define_in_glob_importers(&self, name: Name, ns: Namespace, binding: &'a NameBinding<'a>) {
|
2016-04-16 20:57:09 -05:00
|
|
|
if !binding.is_importable() || !binding.is_pseudo_public() { return }
|
2016-02-15 21:54:14 -06:00
|
|
|
for &(importer, directive) in self.glob_importers.borrow_mut().iter() {
|
|
|
|
let _ = importer.try_define_child(name, ns, directive.import(binding, None));
|
|
|
|
}
|
2015-03-15 16:44:19 -05:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2016-01-31 21:26:16 -06:00
|
|
|
struct ImportResolvingError<'a> {
|
|
|
|
/// Module where the error happened
|
|
|
|
source_module: Module<'a>,
|
2016-03-16 20:13:31 -05:00
|
|
|
import_directive: &'a ImportDirective<'a>,
|
2015-08-04 01:14:32 -05:00
|
|
|
span: Span,
|
|
|
|
help: String,
|
|
|
|
}
|
2015-03-15 16:44:19 -05:00
|
|
|
|
2015-10-26 14:31:11 -05:00
|
|
|
struct ImportResolver<'a, 'b: 'a, 'tcx: 'b> {
|
|
|
|
resolver: &'a mut Resolver<'b, 'tcx>,
|
2015-03-15 16:44:19 -05:00
|
|
|
}
|
|
|
|
|
|
|
|
impl<'a, 'b:'a, 'tcx:'b> ImportResolver<'a, 'b, 'tcx> {
|
|
|
|
// Import resolution
|
|
|
|
//
|
|
|
|
// This is a fixed-point algorithm. We resolve imports until our efforts
|
|
|
|
// are stymied by an unresolved import; then we bail out of the current
|
|
|
|
// module and continue. We terminate successfully once no more imports
|
|
|
|
// remain or unsuccessfully when no forward progress in resolving imports
|
|
|
|
// is made.
|
|
|
|
|
|
|
|
/// Resolves all imports for the crate. This method performs the fixed-
|
|
|
|
/// point iteration.
|
|
|
|
fn resolve_imports(&mut self) {
|
|
|
|
let mut i = 0;
|
|
|
|
let mut prev_unresolved_imports = 0;
|
2016-02-17 03:29:17 -06:00
|
|
|
let mut errors = Vec::new();
|
|
|
|
|
2015-03-15 16:44:19 -05:00
|
|
|
loop {
|
|
|
|
debug!("(resolving imports) iteration {}, {} imports left",
|
2015-10-26 14:31:11 -05:00
|
|
|
i,
|
|
|
|
self.resolver.unresolved_imports);
|
2015-03-15 16:44:19 -05:00
|
|
|
|
2016-04-17 15:23:10 -05:00
|
|
|
// Attempt to resolve imports in all local modules.
|
|
|
|
for module in self.resolver.arenas.local_modules().iter() {
|
|
|
|
self.resolver.current_module = module;
|
|
|
|
self.resolve_imports_in_current_module(&mut errors);
|
|
|
|
}
|
2015-03-15 16:44:19 -05:00
|
|
|
|
|
|
|
if self.resolver.unresolved_imports == 0 {
|
|
|
|
debug!("(resolving imports) success");
|
2016-04-17 15:23:10 -05:00
|
|
|
for module in self.resolver.arenas.local_modules().iter() {
|
|
|
|
self.finalize_resolutions_in(module, false);
|
|
|
|
}
|
2015-03-15 16:44:19 -05:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
if self.resolver.unresolved_imports == prev_unresolved_imports {
|
2015-07-31 11:58:59 -05:00
|
|
|
// resolving failed
|
2016-02-16 05:48:38 -06:00
|
|
|
// Report unresolved imports only if no hard error was already reported
|
|
|
|
// to avoid generating multiple errors on the same import.
|
|
|
|
// Imports that are still indeterminate at this point are actually blocked
|
|
|
|
// by errored imports, so there is no point reporting them.
|
2016-04-17 15:23:10 -05:00
|
|
|
for module in self.resolver.arenas.local_modules().iter() {
|
|
|
|
self.finalize_resolutions_in(module, errors.len() == 0);
|
|
|
|
}
|
2016-02-16 05:48:38 -06:00
|
|
|
for e in errors {
|
|
|
|
self.import_resolving_error(e)
|
2015-07-31 11:58:59 -05:00
|
|
|
}
|
2015-03-15 16:44:19 -05:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
i += 1;
|
|
|
|
prev_unresolved_imports = self.resolver.unresolved_imports;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2016-01-31 21:26:16 -06:00
|
|
|
/// Resolves an `ImportResolvingError` into the correct enum discriminant
|
|
|
|
/// and passes that on to `resolve_error`.
|
2016-02-07 15:23:58 -06:00
|
|
|
fn import_resolving_error(&self, e: ImportResolvingError<'b>) {
|
2016-01-31 21:26:16 -06:00
|
|
|
// If it's a single failed import then create a "fake" import
|
|
|
|
// resolution for it so that later resolve stages won't complain.
|
2016-02-13 15:49:16 -06:00
|
|
|
if let SingleImport { target, .. } = e.import_directive.subclass {
|
2016-02-14 23:18:55 -06:00
|
|
|
let dummy_binding = self.resolver.arenas.alloc_name_binding(NameBinding {
|
2016-02-07 17:58:14 -06:00
|
|
|
kind: NameBindingKind::Def(Def::Err),
|
|
|
|
span: None,
|
2016-04-09 18:19:53 -05:00
|
|
|
vis: ty::Visibility::Public,
|
2016-01-31 21:26:16 -06:00
|
|
|
});
|
2016-02-14 23:18:55 -06:00
|
|
|
let dummy_binding = e.import_directive.import(dummy_binding, None);
|
2016-01-31 21:26:16 -06:00
|
|
|
|
2016-02-14 23:18:55 -06:00
|
|
|
let _ = e.source_module.try_define_child(target, ValueNS, dummy_binding.clone());
|
2016-02-07 17:58:14 -06:00
|
|
|
let _ = e.source_module.try_define_child(target, TypeNS, dummy_binding);
|
2016-01-31 21:26:16 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
let path = import_path_to_string(&e.import_directive.module_path,
|
2016-02-14 20:22:59 -06:00
|
|
|
&e.import_directive.subclass);
|
2016-01-31 21:26:16 -06:00
|
|
|
|
|
|
|
resolve_error(self.resolver,
|
|
|
|
e.span,
|
|
|
|
ResolutionError::UnresolvedImport(Some((&path, &e.help))));
|
|
|
|
}
|
|
|
|
|
2015-03-15 16:44:19 -05:00
|
|
|
/// Attempts to resolve imports for the given module only.
|
2016-03-12 20:53:22 -06:00
|
|
|
fn resolve_imports_in_current_module(&mut self, errors: &mut Vec<ImportResolvingError<'b>>) {
|
2016-02-17 16:45:05 -06:00
|
|
|
let mut imports = Vec::new();
|
2016-03-12 20:53:22 -06:00
|
|
|
let mut unresolved_imports = self.resolver.current_module.unresolved_imports.borrow_mut();
|
2016-02-17 16:45:05 -06:00
|
|
|
::std::mem::swap(&mut imports, &mut unresolved_imports);
|
2015-03-15 16:44:19 -05:00
|
|
|
|
2016-02-17 16:45:05 -06:00
|
|
|
for import_directive in imports {
|
2016-03-12 20:53:22 -06:00
|
|
|
match self.resolve_import(&import_directive) {
|
2016-02-17 16:45:05 -06:00
|
|
|
Failed(err) => {
|
2015-03-15 16:44:19 -05:00
|
|
|
let (span, help) = match err {
|
|
|
|
Some((span, msg)) => (span, format!(". {}", msg)),
|
2015-10-26 14:31:11 -05:00
|
|
|
None => (import_directive.span, String::new()),
|
2015-03-15 16:44:19 -05:00
|
|
|
};
|
2015-08-04 01:14:32 -05:00
|
|
|
errors.push(ImportResolvingError {
|
2016-03-12 20:53:22 -06:00
|
|
|
source_module: self.resolver.current_module,
|
2016-02-17 16:45:05 -06:00
|
|
|
import_directive: import_directive,
|
2015-10-26 14:31:11 -05:00
|
|
|
span: span,
|
|
|
|
help: help,
|
|
|
|
});
|
2015-07-31 11:58:59 -05:00
|
|
|
}
|
2016-02-17 16:45:05 -06:00
|
|
|
Indeterminate => unresolved_imports.push(import_directive),
|
2016-03-12 20:53:22 -06:00
|
|
|
Success(()) => {
|
|
|
|
// Decrement the count of unresolved imports.
|
|
|
|
assert!(self.resolver.unresolved_imports >= 1);
|
|
|
|
self.resolver.unresolved_imports -= 1;
|
|
|
|
}
|
2015-03-15 16:44:19 -05:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Attempts to resolve the given import. The return value indicates
|
|
|
|
/// failure if we're certain the name does not exist, indeterminate if we
|
|
|
|
/// don't know whether the name exists at the moment due to other
|
|
|
|
/// currently-unresolved imports, or success if we know the name exists.
|
|
|
|
/// If successful, the resolved bindings are written into the module.
|
2016-03-16 20:13:31 -05:00
|
|
|
fn resolve_import(&mut self, directive: &'b ImportDirective<'b>) -> ResolveResult<()> {
|
2015-03-15 16:44:19 -05:00
|
|
|
debug!("(resolving import for module) resolving import `{}::...` in `{}`",
|
2016-03-12 20:53:22 -06:00
|
|
|
names_to_string(&directive.module_path),
|
|
|
|
module_to_string(self.resolver.current_module));
|
2015-03-15 16:44:19 -05:00
|
|
|
|
2016-03-17 19:57:05 -05:00
|
|
|
let target_module = match directive.target_module.get() {
|
|
|
|
Some(module) => module,
|
|
|
|
_ => match self.resolver.resolve_module_path(&directive.module_path,
|
|
|
|
DontUseLexicalScope,
|
|
|
|
directive.span) {
|
|
|
|
Success(module) => module,
|
|
|
|
Indeterminate => return Indeterminate,
|
|
|
|
Failed(err) => return Failed(err),
|
|
|
|
},
|
2016-03-12 20:53:22 -06:00
|
|
|
};
|
2015-03-15 16:44:19 -05:00
|
|
|
|
2016-03-17 19:57:05 -05:00
|
|
|
directive.target_module.set(Some(target_module));
|
2016-02-13 15:49:16 -06:00
|
|
|
let (source, target, value_determined, type_determined) = match directive.subclass {
|
|
|
|
SingleImport { source, target, ref value_determined, ref type_determined } =>
|
|
|
|
(source, target, value_determined, type_determined),
|
2016-04-17 14:23:25 -05:00
|
|
|
GlobImport { .. } => return self.resolve_glob_import(target_module, directive),
|
2016-02-13 15:49:16 -06:00
|
|
|
};
|
2016-02-07 17:58:14 -06:00
|
|
|
|
2015-03-15 16:44:19 -05:00
|
|
|
// We need to resolve both namespaces for this to succeed.
|
2016-03-17 19:05:08 -05:00
|
|
|
let value_result =
|
|
|
|
self.resolver.resolve_name_in_module(target_module, source, ValueNS, false, true);
|
|
|
|
let type_result =
|
|
|
|
self.resolver.resolve_name_in_module(target_module, source, TypeNS, false, true);
|
2016-02-13 15:49:16 -06:00
|
|
|
|
2016-03-17 19:05:08 -05:00
|
|
|
let module_ = self.resolver.current_module;
|
2016-02-13 15:49:16 -06:00
|
|
|
for &(ns, result, determined) in &[(ValueNS, &value_result, value_determined),
|
|
|
|
(TypeNS, &type_result, type_determined)] {
|
|
|
|
if determined.get() { continue }
|
|
|
|
if let Indeterminate = *result { continue }
|
|
|
|
|
|
|
|
determined.set(true);
|
|
|
|
if let Success(binding) = *result {
|
2016-04-16 20:57:09 -05:00
|
|
|
if !binding.is_importable() {
|
2016-02-13 15:49:16 -06:00
|
|
|
let msg = format!("`{}` is not directly importable", target);
|
|
|
|
span_err!(self.resolver.session, directive.span, E0253, "{}", &msg);
|
|
|
|
}
|
|
|
|
|
2016-04-09 19:44:14 -05:00
|
|
|
let privacy_error = if !self.resolver.is_accessible(binding.vis) {
|
2016-02-13 15:49:16 -06:00
|
|
|
Some(Box::new(PrivacyError(directive.span, source, binding)))
|
|
|
|
} else {
|
|
|
|
None
|
|
|
|
};
|
|
|
|
|
2016-02-16 07:14:32 -06:00
|
|
|
let imported_binding = directive.import(binding, privacy_error);
|
|
|
|
let conflict = module_.try_define_child(target, ns, imported_binding);
|
|
|
|
if let Err(old_binding) = conflict {
|
2016-03-16 00:20:58 -05:00
|
|
|
let binding = &directive.import(binding, None);
|
|
|
|
self.resolver.report_conflict(module_, target, ns, binding, old_binding);
|
2016-02-16 07:14:32 -06:00
|
|
|
}
|
2016-03-17 03:43:17 -05:00
|
|
|
} else {
|
|
|
|
module_.update_resolution(target, ns, |resolution| {
|
|
|
|
resolution.single_imports.directive_failed();
|
|
|
|
});
|
2016-02-13 15:49:16 -06:00
|
|
|
}
|
2016-02-07 17:58:14 -06:00
|
|
|
}
|
2015-03-15 16:44:19 -05:00
|
|
|
|
2016-02-11 00:17:01 -06:00
|
|
|
match (&value_result, &type_result) {
|
|
|
|
(&Indeterminate, _) | (_, &Indeterminate) => return Indeterminate,
|
|
|
|
(&Failed(_), &Failed(_)) => {
|
2016-03-30 23:44:04 -05:00
|
|
|
let resolutions = target_module.resolutions.borrow();
|
|
|
|
let names = resolutions.iter().filter_map(|(&(ref name, _), resolution)| {
|
2016-04-08 20:06:57 -05:00
|
|
|
if *name == source { return None; } // Never suggest the same name
|
2016-03-30 23:44:04 -05:00
|
|
|
match *resolution.borrow() {
|
|
|
|
NameResolution { binding: Some(_), .. } => Some(name),
|
|
|
|
NameResolution { single_imports: SingleImports::None, .. } => None,
|
|
|
|
_ => Some(name),
|
|
|
|
}
|
|
|
|
});
|
2016-02-11 00:17:01 -06:00
|
|
|
let lev_suggestion = match find_best_match_for_name(names, &source.as_str(), None) {
|
|
|
|
Some(name) => format!(". Did you mean to use `{}`?", name),
|
|
|
|
None => "".to_owned(),
|
|
|
|
};
|
2016-04-08 20:06:57 -05:00
|
|
|
let module_str = module_to_string(target_module);
|
|
|
|
let msg = if &module_str == "???" {
|
|
|
|
format!("There is no `{}` in the crate root{}", source, lev_suggestion)
|
|
|
|
} else {
|
|
|
|
format!("There is no `{}` in `{}`{}", source, module_str, lev_suggestion)
|
|
|
|
};
|
2016-02-11 00:17:01 -06:00
|
|
|
return Failed(Some((directive.span, msg)));
|
|
|
|
}
|
|
|
|
_ => (),
|
|
|
|
}
|
|
|
|
|
2016-04-09 19:44:14 -05:00
|
|
|
let ast_map = self.resolver.ast_map;
|
2016-01-21 21:00:29 -06:00
|
|
|
match (&value_result, &type_result) {
|
2016-04-11 00:35:18 -05:00
|
|
|
(&Success(binding), _) if !binding.pseudo_vis().is_at_least(directive.vis, ast_map) &&
|
2016-04-09 19:44:14 -05:00
|
|
|
self.resolver.is_accessible(binding.vis) => {
|
2016-01-13 19:42:45 -06:00
|
|
|
let msg = format!("`{}` is private, and cannot be reexported", source);
|
2016-02-24 02:47:45 -06:00
|
|
|
let note_msg = format!("consider marking `{}` as `pub` in the imported module",
|
2016-01-13 19:42:45 -06:00
|
|
|
source);
|
|
|
|
struct_span_err!(self.resolver.session, directive.span, E0364, "{}", &msg)
|
|
|
|
.span_note(directive.span, ¬e_msg)
|
|
|
|
.emit();
|
2015-03-15 16:44:19 -05:00
|
|
|
}
|
|
|
|
|
2016-04-11 00:35:18 -05:00
|
|
|
(_, &Success(binding)) if !binding.pseudo_vis().is_at_least(directive.vis, ast_map) &&
|
2016-04-09 19:44:14 -05:00
|
|
|
self.resolver.is_accessible(binding.vis) => {
|
|
|
|
if binding.is_extern_crate() {
|
2016-02-15 21:54:14 -06:00
|
|
|
let msg = format!("extern crate `{}` is private, and cannot be reexported \
|
|
|
|
(error E0364), consider declaring with `pub`",
|
2016-01-13 19:42:45 -06:00
|
|
|
source);
|
|
|
|
self.resolver.session.add_lint(lint::builtin::PRIVATE_IN_PUBLIC,
|
|
|
|
directive.id,
|
|
|
|
directive.span,
|
|
|
|
msg);
|
2016-02-15 21:54:14 -06:00
|
|
|
} else {
|
|
|
|
let msg = format!("`{}` is private, and cannot be reexported", source);
|
|
|
|
let note_msg =
|
|
|
|
format!("consider declaring type or module `{}` with `pub`", source);
|
|
|
|
struct_span_err!(self.resolver.session, directive.span, E0365, "{}", &msg)
|
|
|
|
.span_note(directive.span, ¬e_msg)
|
|
|
|
.emit();
|
2015-03-15 16:44:19 -05:00
|
|
|
}
|
2016-01-13 19:42:45 -06:00
|
|
|
}
|
2015-12-14 11:06:31 -06:00
|
|
|
|
2016-01-21 21:00:29 -06:00
|
|
|
_ => {}
|
2016-01-13 19:42:45 -06:00
|
|
|
}
|
2015-03-15 16:44:19 -05:00
|
|
|
|
2016-02-13 15:49:16 -06:00
|
|
|
// Report a privacy error here if all successful namespaces are privacy errors.
|
2016-02-24 22:40:46 -06:00
|
|
|
let mut privacy_error = None;
|
2016-02-13 15:49:16 -06:00
|
|
|
for &ns in &[ValueNS, TypeNS] {
|
|
|
|
privacy_error = match module_.resolve_name(target, ns, true) {
|
|
|
|
Success(&NameBinding {
|
|
|
|
kind: NameBindingKind::Import { ref privacy_error, .. }, ..
|
|
|
|
}) => privacy_error.as_ref().map(|error| (**error).clone()),
|
|
|
|
_ => continue,
|
|
|
|
};
|
|
|
|
if privacy_error.is_none() { break }
|
2016-02-24 22:40:46 -06:00
|
|
|
}
|
2016-02-13 15:49:16 -06:00
|
|
|
privacy_error.map(|error| self.resolver.privacy_errors.push(error));
|
2016-02-24 22:40:46 -06:00
|
|
|
|
2016-02-07 17:06:10 -06:00
|
|
|
// Record what this import resolves to for later uses in documentation,
|
|
|
|
// this may resolve to either a value or a type, but for documentation
|
|
|
|
// purposes it's good enough to just favor one over the other.
|
2016-02-24 21:36:17 -06:00
|
|
|
let def = match type_result.success().and_then(NameBinding::def) {
|
|
|
|
Some(def) => def,
|
|
|
|
None => value_result.success().and_then(NameBinding::def).unwrap(),
|
2016-02-07 17:06:10 -06:00
|
|
|
};
|
2016-02-24 21:36:17 -06:00
|
|
|
let path_resolution = PathResolution { base_def: def, depth: 0 };
|
|
|
|
self.resolver.def_map.borrow_mut().insert(directive.id, path_resolution);
|
2015-03-15 16:44:19 -05:00
|
|
|
|
|
|
|
debug!("(resolving single import) successfully resolved import");
|
2016-01-21 21:00:29 -06:00
|
|
|
return Success(());
|
2015-03-15 16:44:19 -05:00
|
|
|
}
|
|
|
|
|
|
|
|
// Resolves a glob import. Note that this function cannot fail; it either
|
|
|
|
// succeeds or bails out (as importing * from an empty module or a module
|
|
|
|
// that exports nothing is valid). target_module is the module we are
|
|
|
|
// actually importing, i.e., `foo` in `use foo::*`.
|
2016-03-16 20:13:31 -05:00
|
|
|
fn resolve_glob_import(&mut self, target_module: Module<'b>, directive: &'b ImportDirective<'b>)
|
2015-03-15 16:44:19 -05:00
|
|
|
-> ResolveResult<()> {
|
2016-03-08 16:27:12 -06:00
|
|
|
if let Some(Def::Trait(_)) = target_module.def {
|
|
|
|
self.resolver.session.span_err(directive.span, "items in traits are not importable.");
|
|
|
|
}
|
|
|
|
|
2016-03-12 20:53:22 -06:00
|
|
|
let module_ = self.resolver.current_module;
|
2016-02-07 17:58:14 -06:00
|
|
|
if module_.def_id() == target_module.def_id() {
|
|
|
|
// This means we are trying to glob import a module into itself, and it is a no-go
|
|
|
|
let msg = "Cannot glob-import a module into itself.".into();
|
|
|
|
return Failed(Some((directive.span, msg)));
|
2015-03-15 16:44:19 -05:00
|
|
|
}
|
2016-03-02 03:18:47 -06:00
|
|
|
self.resolver.populate_module_if_necessary(target_module);
|
2016-02-15 21:54:14 -06:00
|
|
|
|
2016-04-17 14:23:25 -05:00
|
|
|
if let GlobImport { is_prelude: true } = directive.subclass {
|
2016-03-08 19:46:46 -06:00
|
|
|
*module_.prelude.borrow_mut() = Some(target_module);
|
|
|
|
return Success(());
|
|
|
|
}
|
|
|
|
|
2016-03-17 06:05:09 -05:00
|
|
|
// Add to target_module's glob_importers
|
2016-02-15 21:54:14 -06:00
|
|
|
target_module.glob_importers.borrow_mut().push((module_, directive));
|
|
|
|
|
2016-04-11 13:30:48 -05:00
|
|
|
// Ensure that `resolutions` isn't borrowed during `try_define_child`,
|
|
|
|
// since it might get updated via a glob cycle.
|
2016-04-07 17:14:44 -05:00
|
|
|
let bindings = target_module.resolutions.borrow().iter().filter_map(|(name, resolution)| {
|
|
|
|
resolution.borrow().binding().map(|binding| (*name, binding))
|
|
|
|
}).collect::<Vec<_>>();
|
|
|
|
for ((name, ns), binding) in bindings {
|
2016-04-16 20:57:09 -05:00
|
|
|
if binding.is_importable() && binding.is_pseudo_public() {
|
2016-04-07 17:14:44 -05:00
|
|
|
let _ = module_.try_define_child(name, ns, directive.import(binding, None));
|
2016-02-07 17:58:14 -06:00
|
|
|
}
|
2016-02-15 21:54:14 -06:00
|
|
|
}
|
2015-03-15 16:44:19 -05:00
|
|
|
|
|
|
|
// Record the destination of this import
|
2015-11-16 01:59:50 -06:00
|
|
|
if let Some(did) = target_module.def_id() {
|
2016-02-07 17:58:14 -06:00
|
|
|
self.resolver.def_map.borrow_mut().insert(directive.id,
|
2015-10-26 14:31:11 -05:00
|
|
|
PathResolution {
|
2016-01-20 13:31:10 -06:00
|
|
|
base_def: Def::Mod(did),
|
2015-10-26 14:31:11 -05:00
|
|
|
depth: 0,
|
|
|
|
});
|
2015-03-15 16:44:19 -05:00
|
|
|
}
|
|
|
|
|
|
|
|
debug!("(resolving glob import) successfully resolved import");
|
2016-02-07 17:58:14 -06:00
|
|
|
return Success(());
|
2015-03-15 16:44:19 -05:00
|
|
|
}
|
|
|
|
|
2016-04-17 19:26:18 -05:00
|
|
|
// Miscellaneous post-processing, including recording reexports, reporting conflicts,
|
|
|
|
// reporting the PRIVATE_IN_PUBLIC lint, and reporting unresolved imports.
|
2016-04-17 15:23:10 -05:00
|
|
|
fn finalize_resolutions_in(&mut self, module: Module<'b>, report_unresolved_imports: bool) {
|
2016-02-15 21:54:14 -06:00
|
|
|
// Since import resolution is finished, globs will not define any more names.
|
2016-03-17 06:05:09 -05:00
|
|
|
*module.globs.borrow_mut() = Vec::new();
|
2016-02-15 21:54:14 -06:00
|
|
|
|
|
|
|
let mut reexports = Vec::new();
|
|
|
|
for (&(name, ns), resolution) in module.resolutions.borrow().iter() {
|
2016-03-30 17:21:56 -05:00
|
|
|
let resolution = resolution.borrow();
|
2016-03-16 00:20:58 -05:00
|
|
|
resolution.report_conflicts(|b1, b2| {
|
|
|
|
self.resolver.report_conflict(module, name, ns, b1, b2)
|
|
|
|
});
|
|
|
|
|
2016-02-15 21:54:14 -06:00
|
|
|
let binding = match resolution.binding {
|
|
|
|
Some(binding) => binding,
|
|
|
|
None => continue,
|
|
|
|
};
|
|
|
|
|
2016-04-11 00:35:18 -05:00
|
|
|
if binding.vis == ty::Visibility::Public &&
|
|
|
|
(binding.is_import() || binding.is_extern_crate()) {
|
2016-02-15 21:54:14 -06:00
|
|
|
if let Some(def) = binding.def() {
|
|
|
|
reexports.push(Export { name: name, def_id: def.def_id() });
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2016-04-16 20:57:09 -05:00
|
|
|
if let NameBindingKind::Import { binding: orig_binding, directive, .. } = binding.kind {
|
2016-04-11 00:35:18 -05:00
|
|
|
if ns == TypeNS && orig_binding.is_variant() &&
|
|
|
|
!orig_binding.vis.is_at_least(binding.vis, &self.resolver.ast_map) {
|
2016-02-15 21:54:14 -06:00
|
|
|
let msg = format!("variant `{}` is private, and cannot be reexported \
|
|
|
|
(error E0364), consider declaring its enum as `pub`",
|
|
|
|
name);
|
|
|
|
let lint = lint::builtin::PRIVATE_IN_PUBLIC;
|
2016-04-16 20:57:09 -05:00
|
|
|
self.resolver.session.add_lint(lint, directive.id, binding.span.unwrap(), msg);
|
2016-02-15 21:54:14 -06:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if reexports.len() > 0 {
|
|
|
|
if let Some(def_id) = module.def_id() {
|
|
|
|
let node_id = self.resolver.ast_map.as_local_node_id(def_id).unwrap();
|
|
|
|
self.resolver.export_map.insert(node_id, reexports);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2016-02-16 05:48:38 -06:00
|
|
|
if report_unresolved_imports {
|
|
|
|
for import in module.unresolved_imports.borrow().iter() {
|
|
|
|
resolve_error(self.resolver, import.span, ResolutionError::UnresolvedImport(None));
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
2016-02-15 21:54:14 -06:00
|
|
|
}
|
2015-03-15 16:44:19 -05:00
|
|
|
}
|
|
|
|
|
2016-02-14 20:22:59 -06:00
|
|
|
fn import_path_to_string(names: &[Name], subclass: &ImportDirectiveSubclass) -> String {
|
2015-03-15 16:44:19 -05:00
|
|
|
if names.is_empty() {
|
|
|
|
import_directive_subclass_to_string(subclass)
|
|
|
|
} else {
|
|
|
|
(format!("{}::{}",
|
|
|
|
names_to_string(names),
|
2015-10-26 14:31:11 -05:00
|
|
|
import_directive_subclass_to_string(subclass)))
|
|
|
|
.to_string()
|
2015-03-15 16:44:19 -05:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2016-02-14 20:22:59 -06:00
|
|
|
fn import_directive_subclass_to_string(subclass: &ImportDirectiveSubclass) -> String {
|
|
|
|
match *subclass {
|
2016-02-13 15:49:16 -06:00
|
|
|
SingleImport { source, .. } => source.to_string(),
|
2016-04-17 14:23:25 -05:00
|
|
|
GlobImport { .. } => "*".to_string(),
|
2015-03-15 16:44:19 -05:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
pub fn resolve_imports(resolver: &mut Resolver) {
|
2015-10-26 14:31:11 -05:00
|
|
|
let mut import_resolver = ImportResolver { resolver: resolver };
|
2015-03-15 16:44:19 -05:00
|
|
|
import_resolver.resolve_imports();
|
|
|
|
}
|