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//===--- PlaceholderTypeInferenceTests.cpp --------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2021 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
//
//===----------------------------------------------------------------------===//
#include "SemaFixture.h"
#include "swift/Sema/ConstraintSystem.h"
using namespace swift;
using namespace swift::unittest;
using namespace swift::constraints;
TEST_F(SemaTest, TestPlaceholderInferenceForArrayLiteral) {
auto *intTypeDecl = getStdlibNominalTypeDecl("Int");
auto *intLiteral = new (Context) IntegerLiteralExpr("0", SourceLoc(), true);
auto *arrayExpr = ArrayExpr::create(Context, SourceLoc(), {intLiteral}, {}, SourceLoc());
auto *placeholderRepr = new (Context) PlaceholderTypeRepr(SourceLoc());
auto *arrayRepr = new (Context) ArrayTypeRepr(placeholderRepr, SourceRange());
auto placeholderTy = PlaceholderType::get(Context, placeholderRepr);
auto *arrayTy = ArraySliceType::get(placeholderTy);
auto *varDecl = new (Context) VarDecl(false, VarDecl::Introducer::Let, SourceLoc(), Context.getIdentifier("x"), DC);
auto *namedPattern = new (Context) NamedPattern(varDecl);
auto *typedPattern = new (Context) TypedPattern(namedPattern, arrayRepr);
auto target = SyntacticElementTarget::forInitialization(
arrayExpr, DC, arrayTy, typedPattern, /*bindPatternVarsOneWay=*/false);
ConstraintSystem cs(DC, ConstraintSystemOptions());
ContextualTypeInfo contextualInfo({arrayRepr, arrayTy}, CTP_Initialization);
cs.setContextualInfo(arrayExpr, contextualInfo);
auto failed = cs.generateConstraints(target, FreeTypeVariableBinding::Disallow);
ASSERT_FALSE(failed);
SmallVector<Solution, 2> solutions;
cs.solve(solutions);
// We should have a solution.
ASSERT_EQ(solutions.size(), 1u);
auto &solution = solutions[0];
auto eltTy = solution.simplifyType(solution.getType(arrayExpr))->isArrayType();
ASSERT_TRUE(eltTy);
ASSERT_TRUE(eltTy->is<StructType>());
ASSERT_EQ(eltTy->getAs<StructType>()->getDecl(), intTypeDecl);
}
TEST_F(SemaTest, TestPlaceholderInferenceForDictionaryLiteral) {
auto *intTypeDecl = getStdlibNominalTypeDecl("Int");
auto *stringTypeDecl = getStdlibNominalTypeDecl("String");
auto *intLiteral = new (Context) IntegerLiteralExpr("0", SourceLoc(), true);
auto *stringLiteral = new (Context) StringLiteralExpr("test", SourceRange(), true);
auto *kvTupleExpr = TupleExpr::create(Context, SourceLoc(), {stringLiteral, intLiteral}, {}, {}, SourceLoc(), true);
auto *dictExpr = DictionaryExpr::create(Context, SourceLoc(), {kvTupleExpr}, {}, SourceLoc());
auto *keyPlaceholderRepr = new (Context) PlaceholderTypeRepr(SourceLoc());
auto *valPlaceholderRepr = new (Context) PlaceholderTypeRepr(SourceLoc());
auto *dictRepr = new (Context) DictionaryTypeRepr(keyPlaceholderRepr, valPlaceholderRepr, SourceLoc(), SourceRange());
auto keyPlaceholderTy = PlaceholderType::get(Context, keyPlaceholderRepr);
auto valPlaceholderTy = PlaceholderType::get(Context, valPlaceholderRepr);
auto *dictTy = DictionaryType::get(keyPlaceholderTy, valPlaceholderTy);
auto *varDecl = new (Context) VarDecl(false, VarDecl::Introducer::Let, SourceLoc(), Context.getIdentifier("x"), DC);
auto *namedPattern = new (Context) NamedPattern(varDecl);
auto *typedPattern = new (Context) TypedPattern(namedPattern, dictRepr);
auto target = SyntacticElementTarget::forInitialization(
dictExpr, DC, dictTy, typedPattern, /*bindPatternVarsOneWay=*/false);
ConstraintSystem cs(DC, ConstraintSystemOptions());
ContextualTypeInfo contextualInfo({dictRepr, dictTy}, CTP_Initialization);
cs.setContextualInfo(dictExpr, contextualInfo);
auto failed = cs.generateConstraints(target, FreeTypeVariableBinding::Disallow);
ASSERT_FALSE(failed);
SmallVector<Solution, 2> solutions;
cs.solve(solutions);
// We should have a solution.
ASSERT_EQ(solutions.size(), 1u);
auto &solution = solutions[0];
auto keyValTys = ConstraintSystem::isDictionaryType(solution.simplifyType(solution.getType(dictExpr)));
ASSERT_TRUE(keyValTys.has_value());
Type keyTy;
Type valTy;
std::tie(keyTy, valTy) = *keyValTys;
ASSERT_TRUE(keyTy->is<StructType>());
ASSERT_EQ(keyTy->getAs<StructType>()->getDecl(), stringTypeDecl);
ASSERT_TRUE(valTy->is<StructType>());
ASSERT_EQ(valTy->getAs<StructType>()->getDecl(), intTypeDecl);
}
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