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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2017 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 "RefactoringActions.h"
using namespace swift::refactoring;
static std::unique_ptr<llvm::SetVector<Expr *>>
findConcatenatedExpressions(const ResolvedRangeInfo &Info, ASTContext &Ctx) {
Expr *E = nullptr;
switch (Info.Kind) {
case RangeKind::SingleExpression:
E = Info.ContainedNodes[0].get<Expr *>();
break;
case RangeKind::PartOfExpression:
E = Info.CommonExprParent;
break;
default:
return nullptr;
}
assert(E);
struct StringInterpolationExprFinder : public SourceEntityWalker {
std::unique_ptr<llvm::SetVector<Expr *>> Bucket =
std::make_unique<llvm::SetVector<Expr *>>();
ASTContext &Ctx;
bool IsValidInterpolation = true;
StringInterpolationExprFinder(ASTContext &Ctx) : Ctx(Ctx) {}
bool isConcatenationExpr(DeclRefExpr *Expr) {
if (!Expr)
return false;
auto *FD = dyn_cast<FuncDecl>(Expr->getDecl());
if (FD == nullptr ||
(FD != Ctx.getPlusFunctionOnString() &&
FD != Ctx.getPlusFunctionOnRangeReplaceableCollection())) {
return false;
}
return true;
}
bool walkToExprPre(Expr *E) override {
if (E->isImplicit())
return true;
// FIXME: we should have ErrorType instead of null.
if (E->getType().isNull())
return true;
// Only binary concatenation operators should exist in expression
if (E->getKind() == ExprKind::Binary) {
auto *BE = dyn_cast<BinaryExpr>(E);
auto *OperatorDeclRef = BE->getSemanticFn()->getMemberOperatorRef();
if (!(isConcatenationExpr(OperatorDeclRef) &&
E->getType()->isString())) {
IsValidInterpolation = false;
return false;
}
return true;
}
// Everything that evaluates to string should be gathered.
if (E->getType()->isString()) {
Bucket->insert(E);
return false;
}
if (auto *DR = dyn_cast<DeclRefExpr>(E)) {
// Checks whether all function references in expression are
// concatenations.
auto *FD = dyn_cast<FuncDecl>(DR->getDecl());
auto IsConcatenation = isConcatenationExpr(DR);
if (FD && IsConcatenation) {
return false;
}
}
// There was non-expected expression, it's not valid interpolation then.
IsValidInterpolation = false;
return false;
}
} Walker(Ctx);
Walker.walk(E);
// There should be two or more expressions to convert.
if (!Walker.IsValidInterpolation || Walker.Bucket->size() < 2)
return nullptr;
return std::move(Walker.Bucket);
}
static void interpolatedExpressionForm(Expr *E, SourceManager &SM,
llvm::raw_ostream &OS) {
if (auto *Literal = dyn_cast<StringLiteralExpr>(E)) {
OS << Literal->getValue();
return;
}
auto ExpStr =
Lexer::getCharSourceRangeFromSourceRange(SM, E->getSourceRange())
.str()
.str();
if (isa<InterpolatedStringLiteralExpr>(E)) {
ExpStr.erase(0, 1);
ExpStr.pop_back();
OS << ExpStr;
return;
}
OS << "\\(" << ExpStr << ")";
}
bool RefactoringActionConvertStringsConcatenationToInterpolation::isApplicable(
const ResolvedRangeInfo &Info, DiagnosticEngine &Diag) {
auto RangeContext = Info.RangeContext;
if (RangeContext) {
auto &Ctx = Info.RangeContext->getASTContext();
return findConcatenatedExpressions(Info, Ctx) != nullptr;
}
return false;
}
bool RefactoringActionConvertStringsConcatenationToInterpolation::
performChange() {
auto Expressions = findConcatenatedExpressions(RangeInfo, Ctx);
if (!Expressions)
return true;
EditorConsumerInsertStream OS(EditConsumer, SM, RangeInfo.ContentRange);
OS << "\"";
for (auto It = Expressions->begin(); It != Expressions->end(); ++It) {
interpolatedExpressionForm(*It, SM, OS);
}
OS << "\"";
return false;
}
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