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//===--- ASTScriptEvaluator.cpp -------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2019 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
///
/// AST script evaluation.
///
//===----------------------------------------------------------------------===//
#include "ASTScript.h"
#include "ASTScriptConfiguration.h"
#include "swift/AST/ASTMangler.h"
#include "swift/AST/ASTWalker.h"
#include "swift/AST/Decl.h"
#include "swift/AST/NameLookup.h"
#include "swift/AST/NameLookupRequests.h"
#include "swift/Frontend/Frontend.h"
using namespace swift;
using namespace scripting;
namespace {
class ASTScriptWalker : public ASTWalker {
const ASTScript &Script;
ProtocolDecl *ViewProtocol;
public:
ASTScriptWalker(const ASTScript &script, ProtocolDecl *viewProtocol)
: Script(script), ViewProtocol(viewProtocol) {}
MacroWalking getMacroWalkingBehavior() const override {
return MacroWalking::Expansion;
}
PreWalkAction walkToDeclPre(Decl *D) override {
visit(D);
return Action::Continue();
}
void visit(const Decl *D) {
auto fn = dyn_cast<AbstractFunctionDecl>(D);
if (!fn) return;
// Suppress warnings.
(void) Script;
for (auto param : *fn->getParameters()) {
// The parameter must have function type.
auto paramType = param->getInterfaceType();
auto paramFnType = paramType->getAs<FunctionType>();
if (!paramFnType) continue;
// The parameter function must return a type parameter that
// conforms to SwiftUI.View.
auto paramResultType = paramFnType->getResult();
if (!paramResultType->isTypeParameter()) continue;
auto sig = fn->getGenericSignature();
if (!sig->requiresProtocol(paramResultType, ViewProtocol)) continue;
// The parameter must not be a @ViewBuilder parameter.
if (param->getResultBuilderType()) continue;
// Print the function.
printDecl(fn);
}
}
void printDecl(const ValueDecl *decl) {
// FIXME: there's got to be some better way to print an exact reference
// to a declaration, including its context.
printDecl(llvm::outs(), decl);
llvm::outs() << "\n";
}
void printDecl(llvm::raw_ostream &out, const ValueDecl *decl) {
if (auto accessor = dyn_cast<AccessorDecl>(decl)) {
printDecl(out, accessor->getStorage());
out << ".(accessor)";
} else {
printDeclContext(out, decl->getDeclContext());
out << decl->getName();
}
}
void printDeclContext(llvm::raw_ostream &out, const DeclContext *dc) {
if (!dc) return;
if (auto module = dyn_cast<ModuleDecl>(dc)) {
out << module->getName() << ".";
} else if (auto extension = dyn_cast<ExtensionDecl>(dc)) {
auto *extended = extension->getExtendedNominal();
if (extended) {
printDecl(out, extended);
out << ".";
}
} else if (auto decl = dyn_cast_or_null<ValueDecl>(dc->getAsDecl())) {
printDecl(out, decl);
out << ".";
} else {
printDeclContext(out, dc->getParent());
}
}
};
}
bool ASTScript::execute() const {
// Hardcode the actual query we want to execute here.
auto &ctx = Config.Compiler.getASTContext();
auto swiftUI = ctx.getLoadedModule(ctx.getIdentifier("SwiftUI"));
if (!swiftUI) {
llvm::errs() << "error: SwiftUI module not loaded\n";
return true;
}
auto descriptor =
UnqualifiedLookupDescriptor(DeclNameRef(ctx.getIdentifier("View")),
swiftUI);
auto viewLookup = evaluateOrDefault(ctx.evaluator,
UnqualifiedLookupRequest{descriptor}, {});
auto viewProtocol =
dyn_cast_or_null<ProtocolDecl>(viewLookup.getSingleTypeResult());
if (!viewProtocol) {
llvm::errs() << "error: couldn't find SwiftUI.View protocol\n";
return true;
}
SmallVector<Decl*, 128> topLevelDecls;
swiftUI->getTopLevelDecls(topLevelDecls);
llvm::errs() << "found " << topLevelDecls.size() << " top-level declarations\n";
ASTScriptWalker walker(*this, viewProtocol);
for (auto decl : topLevelDecls) {
decl->walk(walker);
}
return false;
}
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