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-rw-r--r--lib/Tooling/Transformer/SourceCode.cpp65
1 files changed, 65 insertions, 0 deletions
diff --git a/lib/Tooling/Transformer/SourceCode.cpp b/lib/Tooling/Transformer/SourceCode.cpp
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+++ b/lib/Tooling/Transformer/SourceCode.cpp
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+//===--- SourceCode.cpp - Source code manipulation routines -----*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file provides functions that simplify extraction of source code.
+//
+//===----------------------------------------------------------------------===//
+#include "clang/Tooling/Transformer/SourceCode.h"
+#include "clang/Lex/Lexer.h"
+
+using namespace clang;
+
+StringRef clang::tooling::getText(CharSourceRange Range,
+ const ASTContext &Context) {
+ return Lexer::getSourceText(Range, Context.getSourceManager(),
+ Context.getLangOpts());
+}
+
+CharSourceRange clang::tooling::maybeExtendRange(CharSourceRange Range,
+ tok::TokenKind Next,
+ ASTContext &Context) {
+ Optional<Token> Tok = Lexer::findNextToken(
+ Range.getEnd(), Context.getSourceManager(), Context.getLangOpts());
+ if (!Tok || !Tok->is(Next))
+ return Range;
+ return CharSourceRange::getTokenRange(Range.getBegin(), Tok->getLocation());
+}
+
+llvm::Optional<CharSourceRange>
+clang::tooling::getRangeForEdit(const CharSourceRange &EditRange,
+ const SourceManager &SM,
+ const LangOptions &LangOpts) {
+ // FIXME: makeFileCharRange() has the disadvantage of stripping off "identity"
+ // macros. For example, if we're looking to rewrite the int literal 3 to 6,
+ // and we have the following definition:
+ // #define DO_NOTHING(x) x
+ // then
+ // foo(DO_NOTHING(3))
+ // will be rewritten to
+ // foo(6)
+ // rather than the arguably better
+ // foo(DO_NOTHING(6))
+ // Decide whether the current behavior is desirable and modify if not.
+ CharSourceRange Range = Lexer::makeFileCharRange(EditRange, SM, LangOpts);
+ if (Range.isInvalid())
+ return None;
+
+ if (Range.getBegin().isMacroID() || Range.getEnd().isMacroID())
+ return None;
+ if (SM.isInSystemHeader(Range.getBegin()) ||
+ SM.isInSystemHeader(Range.getEnd()))
+ return None;
+
+ std::pair<FileID, unsigned> BeginInfo = SM.getDecomposedLoc(Range.getBegin());
+ std::pair<FileID, unsigned> EndInfo = SM.getDecomposedLoc(Range.getEnd());
+ if (BeginInfo.first != EndInfo.first ||
+ BeginInfo.second > EndInfo.second)
+ return None;
+
+ return Range;
+}