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85 lines
2.5 KiB
C++
85 lines
2.5 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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#include "RefactoringActions.h"
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#include "swift/AST/Stmt.h"
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using namespace swift::refactoring;
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static std::pair<IfStmt *, IfStmt *>
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findCollapseNestedIfTarget(ResolvedCursorInfoPtr CursorInfo) {
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auto StmtStartInfo = dyn_cast<ResolvedStmtStartCursorInfo>(CursorInfo);
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if (!StmtStartInfo)
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return {};
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// Ensure the statement is 'if' statement. It must not have 'else' clause.
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IfStmt *OuterIf = dyn_cast<IfStmt>(StmtStartInfo->getTrailingStmt());
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if (!OuterIf)
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return {};
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if (OuterIf->getElseStmt())
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return {};
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// The body must contain a sole inner 'if' statement.
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auto Body = dyn_cast_or_null<BraceStmt>(OuterIf->getThenStmt());
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if (!Body || Body->getNumElements() != 1)
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return {};
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IfStmt *InnerIf =
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dyn_cast_or_null<IfStmt>(Body->getFirstElement().dyn_cast<Stmt *>());
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if (!InnerIf)
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return {};
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// Inner 'if' statement also cannot have 'else' clause.
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if (InnerIf->getElseStmt())
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return {};
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return {OuterIf, InnerIf};
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}
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bool RefactoringActionCollapseNestedIfStmt::isApplicable(
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ResolvedCursorInfoPtr CursorInfo, DiagnosticEngine &Diag) {
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return findCollapseNestedIfTarget(CursorInfo).first;
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}
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bool RefactoringActionCollapseNestedIfStmt::performChange() {
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auto Target = findCollapseNestedIfTarget(CursorInfo);
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if (!Target.first)
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return true;
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auto OuterIf = Target.first;
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auto InnerIf = Target.second;
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EditorConsumerInsertStream OS(
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EditConsumer, SM,
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Lexer::getCharSourceRangeFromSourceRange(SM, OuterIf->getSourceRange()));
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OS << tok::kw_if << " ";
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// Emit conditions.
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bool first = true;
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for (auto &C : llvm::concat<StmtConditionElement>(OuterIf->getCond(),
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InnerIf->getCond())) {
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if (first)
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first = false;
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else
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OS << ", ";
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OS << Lexer::getCharSourceRangeFromSourceRange(SM, C.getSourceRange())
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.str();
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}
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// Emit body.
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OS << " ";
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OS << Lexer::getCharSourceRangeFromSourceRange(
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SM, InnerIf->getThenStmt()->getSourceRange())
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.str();
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return false;
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}
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