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/* Compiler implementation of the D programming language
* Copyright (C) 1999-2019 by The D Language Foundation, All Rights Reserved
* written by Walter Bright
* http://www.digitalmars.com
* Distributed under the Boost Software License, Version 1.0.
* http://www.boost.org/LICENSE_1_0.txt
* https://github.com/D-Programming-Language/dmd/blob/master/src/import.c
*/
#include "root/dsystem.h"
#include "root/root.h"
#include "mars.h"
#include "dsymbol.h"
#include "import.h"
#include "identifier.h"
#include "module.h"
#include "scope.h"
#include "mtype.h"
#include "declaration.h"
#include "id.h"
#include "attrib.h"
#include "hdrgen.h"
/********************************* Import ****************************/
Import::Import(Loc loc, Identifiers *packages, Identifier *id, Identifier *aliasId,
int isstatic)
: Dsymbol(NULL)
{
assert(id);
this->loc = loc;
this->packages = packages;
this->id = id;
this->aliasId = aliasId;
this->isstatic = isstatic;
this->protection = Prot(PROTprivate); // default to private
this->pkg = NULL;
this->mod = NULL;
// Set symbol name (bracketed)
if (aliasId)
{
// import [cstdio] = std.stdio;
this->ident = aliasId;
}
else if (packages && packages->dim)
{
// import [std].stdio;
this->ident = (*packages)[0];
}
else
{
// import [foo];
this->ident = id;
}
}
void Import::addAlias(Identifier *name, Identifier *alias)
{
if (isstatic)
error("cannot have an import bind list");
if (!aliasId)
this->ident = NULL; // make it an anonymous import
names.push(name);
aliases.push(alias);
}
const char *Import::kind() const
{
return isstatic ? "static import" : "import";
}
Prot Import::prot()
{
return protection;
}
Dsymbol *Import::syntaxCopy(Dsymbol *s)
{
assert(!s);
Import *si = new Import(loc, packages, id, aliasId, isstatic);
for (size_t i = 0; i < names.dim; i++)
{
si->addAlias(names[i], aliases[i]);
}
return si;
}
void Import::load(Scope *sc)
{
//printf("Import::load('%s') %p\n", toPrettyChars(), this);
// See if existing module
DsymbolTable *dst = Package::resolve(packages, NULL, &pkg);
Dsymbol *s = dst->lookup(id);
if (s)
{
if (s->isModule())
mod = (Module *)s;
else
{
if (s->isAliasDeclaration())
{
::error(loc, "%s %s conflicts with %s", s->kind(), s->toPrettyChars(), id->toChars());
}
else if (Package *p = s->isPackage())
{
if (p->isPkgMod == PKGunknown)
{
mod = Module::load(loc, packages, id);
if (!mod)
p->isPkgMod = PKGpackage;
else
{
// mod is a package.d, or a normal module which conflicts with the package name.
assert(mod->isPackageFile == (p->isPkgMod == PKGmodule));
if (mod->isPackageFile)
mod->tag = p->tag; // reuse the same package tag
}
}
else
{
mod = p->isPackageMod();
}
if (!mod)
{
::error(loc, "can only import from a module, not from package %s.%s",
p->toPrettyChars(), id->toChars());
}
}
else if (pkg)
{
::error(loc, "can only import from a module, not from package %s.%s",
pkg->toPrettyChars(), id->toChars());
}
else
{
::error(loc, "can only import from a module, not from package %s",
id->toChars());
}
}
}
if (!mod)
{
// Load module
mod = Module::load(loc, packages, id);
if (mod)
{
dst->insert(id, mod); // id may be different from mod->ident,
// if so then insert alias
}
}
if (mod && !mod->importedFrom)
mod->importedFrom = sc ? sc->_module->importedFrom : Module::rootModule;
if (!pkg)
pkg = mod;
//printf("-Import::load('%s'), pkg = %p\n", toChars(), pkg);
}
void Import::importAll(Scope *sc)
{
if (!mod)
{
load(sc);
if (mod) // if successfully loaded module
{
mod->importAll(NULL);
if (mod->md && mod->md->isdeprecated)
{
Expression *msg = mod->md->msg;
if (StringExp *se = msg ? msg->toStringExp() : NULL)
mod->deprecation(loc, "is deprecated - %s", se->string);
else
mod->deprecation(loc, "is deprecated");
}
if (sc->explicitProtection)
protection = sc->protection;
if (!isstatic && !aliasId && !names.dim)
{
sc->scopesym->importScope(mod, protection);
}
}
}
}
void Import::semantic(Scope *sc)
{
//printf("Import::semantic('%s') %s\n", toPrettyChars(), id->toChars());
if (_scope)
{
sc = _scope;
_scope = NULL;
}
// Load if not already done so
if (!mod)
{
load(sc);
if (mod)
mod->importAll(NULL);
}
if (mod)
{
// Modules need a list of each imported module
//printf("%s imports %s\n", sc->_module->toChars(), mod->toChars());
sc->_module->aimports.push(mod);
if (sc->explicitProtection)
protection = sc->protection;
if (!aliasId && !names.dim) // neither a selective nor a renamed import
{
ScopeDsymbol *scopesym = NULL;
if (sc->explicitProtection)
protection = sc->protection.kind;
for (Scope *scd = sc; scd; scd = scd->enclosing)
{
if (!scd->scopesym)
continue;
scopesym = scd->scopesym;
break;
}
if (!isstatic)
{
scopesym->importScope(mod, protection);
}
// 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. See Bugzilla 313.
if (packages)
{
// import a.b.c.d;
Package *p = pkg; // a
scopesym->addAccessiblePackage(p, protection);
for (size_t i = 1; i < packages->dim; i++) // [b, c]
{
Identifier *id = (*packages)[i];
p = (Package *) p->symtab->lookup(id);
scopesym->addAccessiblePackage(p, protection);
}
}
scopesym->addAccessiblePackage(mod, protection); // d
}
mod->semantic(NULL);
if (mod->needmoduleinfo)
{
//printf("module4 %s because of %s\n", sc->_module->toChars(), mod->toChars());
sc->_module->needmoduleinfo = 1;
}
sc = sc->push(mod);
sc->protection = protection;
for (size_t i = 0; i < aliasdecls.dim; i++)
{
AliasDeclaration *ad = aliasdecls[i];
//printf("\tImport %s alias %s = %s, scope = %p\n", toPrettyChars(), aliases[i]->toChars(), names[i]->toChars(), ad->_scope);
if (mod->search(loc, names[i]))
{
ad->semantic(sc);
// If the import declaration is in non-root module,
// analysis of the aliased symbol is deferred.
// Therefore, don't see the ad->aliassym or ad->type here.
}
else
{
Dsymbol *s = mod->search_correct(names[i]);
if (s)
mod->error(loc, "import '%s' not found, did you mean %s '%s'?", names[i]->toChars(), s->kind(), s->toChars());
else
mod->error(loc, "import '%s' not found", names[i]->toChars());
ad->type = Type::terror;
}
}
sc = sc->pop();
}
// object self-imports itself, so skip that (Bugzilla 7547)
// don't list pseudo modules __entrypoint.d, __main.d (Bugzilla 11117, 11164)
if (global.params.moduleDeps != NULL &&
!(id == Id::object && sc->_module->ident == Id::object) &&
sc->_module->ident != Id::entrypoint &&
strcmp(sc->_module->ident->toChars(), "__main") != 0)
{
/* The grammar of the file is:
* ImportDeclaration
* ::= BasicImportDeclaration [ " : " ImportBindList ] [ " -> "
* ModuleAliasIdentifier ] "\n"
*
* BasicImportDeclaration
* ::= ModuleFullyQualifiedName " (" FilePath ") : " Protection|"string"
* " [ " static" ] : " ModuleFullyQualifiedName " (" FilePath ")"
*
* FilePath
* - any string with '(', ')' and '\' escaped with the '\' character
*/
OutBuffer *ob = global.params.moduleDeps;
Module* imod = sc->instantiatingModule();
if (!global.params.moduleDepsFile)
ob->writestring("depsImport ");
ob->writestring(imod->toPrettyChars());
ob->writestring(" (");
escapePath(ob, imod->srcfile->toChars());
ob->writestring(") : ");
// use protection instead of sc->protection because it couldn't be
// resolved yet, see the comment above
protectionToBuffer(ob, protection);
ob->writeByte(' ');
if (isstatic)
{
stcToBuffer(ob, STCstatic);
ob->writeByte(' ');
}
ob->writestring(": ");
if (packages)
{
for (size_t i = 0; i < packages->dim; i++)
{
Identifier *pid = (*packages)[i];
ob->printf("%s.", pid->toChars());
}
}
ob->writestring(id->toChars());
ob->writestring(" (");
if (mod)
escapePath(ob, mod->srcfile->toChars());
else
ob->writestring("???");
ob->writeByte(')');
for (size_t i = 0; i < names.dim; i++)
{
if (i == 0)
ob->writeByte(':');
else
ob->writeByte(',');
Identifier *name = names[i];
Identifier *alias = aliases[i];
if (!alias)
{
ob->printf("%s", name->toChars());
alias = name;
}
else
ob->printf("%s=%s", alias->toChars(), name->toChars());
}
if (aliasId)
ob->printf(" -> %s", aliasId->toChars());
ob->writenl();
}
//printf("-Import::semantic('%s'), pkg = %p\n", toChars(), pkg);
}
void Import::semantic2(Scope *sc)
{
//printf("Import::semantic2('%s')\n", toChars());
if (mod)
{
mod->semantic2(NULL);
if (mod->needmoduleinfo)
{
//printf("module5 %s because of %s\n", sc->_module->toChars(), mod->toChars());
if (sc)
sc->_module->needmoduleinfo = 1;
}
}
}
Dsymbol *Import::toAlias()
{
if (aliasId)
return mod;
return this;
}
/*****************************
* Add import to sd's symbol table.
*/
void Import::addMember(Scope *sc, ScopeDsymbol *sd)
{
//printf("Import::addMember(this=%s, sd=%s, sc=%p)\n", toChars(), sd->toChars(), sc);
if (names.dim == 0)
return Dsymbol::addMember(sc, sd);
if (aliasId)
Dsymbol::addMember(sc, sd);
/* Instead of adding the import to sd's symbol table,
* add each of the alias=name pairs
*/
for (size_t i = 0; i < names.dim; i++)
{
Identifier *name = names[i];
Identifier *alias = aliases[i];
if (!alias)
alias = name;
TypeIdentifier *tname = new TypeIdentifier(loc, name);
AliasDeclaration *ad = new AliasDeclaration(loc, alias, tname);
ad->_import = this;
ad->addMember(sc, sd);
aliasdecls.push(ad);
}
}
void Import::setScope(Scope *sc)
{
Dsymbol::setScope(sc);
if (aliasdecls.dim)
{
if (!mod)
importAll(sc);
sc = sc->push(mod);
sc->protection = protection;
for (size_t i = 0; i < aliasdecls.dim; i++)
{
AliasDeclaration *ad = aliasdecls[i];
ad->setScope(sc);
}
sc = sc->pop();
}
}
Dsymbol *Import::search(const Loc &loc, Identifier *ident, int flags)
{
//printf("%s.Import::search(ident = '%s', flags = x%x)\n", toChars(), ident->toChars(), flags);
if (!pkg)
{
load(NULL);
mod->importAll(NULL);
mod->semantic(NULL);
}
// Forward it to the package/module
return pkg->search(loc, ident, flags);
}
bool Import::overloadInsert(Dsymbol *s)
{
/* Allow multiple imports with the same package base, but disallow
* alias collisions (Bugzilla 5412).
*/
assert(ident && ident == s->ident);
Import *imp;
if (!aliasId && (imp = s->isImport()) != NULL && !imp->aliasId)
return true;
else
return false;
}