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/**
* A `Dsymbol` representing a renamed import.
*
* Copyright: Copyright (C) 1999-2025 by The D Language Foundation, All Rights Reserved
* Authors: $(LINK2 https://www.digitalmars.com, Walter Bright)
* License: $(LINK2 https://www.boost.org/LICENSE_1_0.txt, Boost License 1.0)
* Source: $(LINK2 https://github.com/dlang/dmd/blob/master/compiler/src/dmd/dimport.d, _dimport.d)
* Documentation: https://dlang.org/phobos/dmd_dimport.html
* Coverage: https://codecov.io/gh/dlang/dmd/src/master/compiler/src/dmd/dimport.d
*/
module dmd.dimport;
import dmd.arraytypes;
import dmd.dmodule;
import dmd.dsymbol;
import dmd.identifier;
import dmd.location;
import dmd.visitor;
/***********************************************************
*/
extern (C++) final class Import : Dsymbol
{
/* static import aliasId = pkg1.pkg2.id : alias1 = name1, alias2 = name2;
*/
Identifier[] packages; // array of Identifier's representing packages
Identifier id; // module Identifier
Identifier aliasId;
int isstatic; // !=0 if static import
Visibility visibility;
// Pairs of alias=name to bind into current namespace
Identifiers names;
Identifiers aliases;
Module mod;
Package pkg; // leftmost package/module
// corresponding AliasDeclarations for alias=name pairs
AliasDeclarations aliasdecls;
extern (D) this(Loc loc, Identifier[] packages, Identifier id, Identifier aliasId, int isstatic)
{
Identifier selectIdent()
{
// select Dsymbol identifier (bracketed)
if (aliasId)
{
// import [aliasId] = std.stdio;
return aliasId;
}
if (packages.length > 0)
{
// import [std].stdio;
return packages[0];
}
// import [id];
return id;
}
super(DSYM.import_, loc, selectIdent());
assert(id);
version (none)
{
import core.stdc.stdio;
printf("Import::Import(");
foreach (id; packages)
{
printf("%s.", id.toChars());
}
printf("%s)\n", id.toChars());
}
this.packages = packages;
this.id = id;
this.aliasId = aliasId;
this.isstatic = isstatic;
this.visibility = Visibility.Kind.private_; // default to private
}
override const(char)* kind() const
{
return isstatic ? "static import" : "import";
}
override Visibility visible() pure nothrow @nogc @safe
{
return visibility;
}
// copy only syntax trees
override Import syntaxCopy(Dsymbol s)
{
assert(!s);
auto si = new Import(loc, packages, id, aliasId, isstatic);
si.comment = comment;
assert(!(isstatic && names.length));
if (names.length && !si.aliasId)
si.ident = null;
for (size_t i = 0; i < names.length; i++)
{
si.names.push(names[i]);
si.aliases.push(aliases[i]);
}
return si;
}
/*******************************
* Mark the imported packages as accessible from the current
* scope. This access check is necessary when using FQN b/c
* we're using a single global package tree.
* https://issues.dlang.org/show_bug.cgi?id=313
*/
extern (D) void addPackageAccess(ScopeDsymbol scopesym)
{
//printf("Import::addPackageAccess('%s') %p\n", toPrettyChars(), this);
if (packages.length > 0)
{
// import a.b.c.d;
auto p = pkg; // a
scopesym.addAccessiblePackage(p, visibility);
foreach (id; packages[1 .. $]) // [b, c]
{
auto sym = p.symtab.lookup(id);
// https://issues.dlang.org/show_bug.cgi?id=17991
// An import of truly empty file/package can happen
// https://issues.dlang.org/show_bug.cgi?id=20151
// Package in the path conflicts with a module name
if (sym is null)
break;
// https://issues.dlang.org/show_bug.cgi?id=23327
// Package conflicts with symbol of the same name
p = sym.isPackage();
if (p is null)
break;
scopesym.addAccessiblePackage(p, visibility);
}
}
scopesym.addAccessiblePackage(mod, visibility); // d
}
override Dsymbol toAlias()
{
if (aliasId)
return mod;
return this;
}
override bool overloadInsert(Dsymbol s)
{
/* Allow multiple imports with the same package base, but disallow
* alias collisions
* https://issues.dlang.org/show_bug.cgi?id=5412
*/
assert(ident && ident == s.ident);
if (aliasId)
return false;
const imp = s.isImport();
return imp && !imp.aliasId;
}
override void accept(Visitor v)
{
v.visit(this);
}
}
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