[LibTooling] Add "SourceCode" library for functions relating to source-code manipulation.

Summary:
Introduces a utility library in Refactoring/ to collect routines related to
source-code manipulation.  In this change, we move "extended-range" functions
from the FixIt library (in clangTooling) to this new library.

We need to use this functionality in Refactoring/ and cannot access it if it
resides in Tooling/, because that would cause clangToolingRefactor to depend on
clangTooling, which would be a circular dependency.

Reviewers: ilya-biryukov, ioeric

Reviewed By: ilya-biryukov

Subscribers: mgorny, cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D60269

llvm-svn: 357764

1 files changed, 31 insertions, 0 deletions

diff --git a/clang/lib/Tooling/Refactoring/SourceCode.cpp b/clang/lib/Tooling/Refactoring/SourceCode.cpp
new file mode 100644
index 00000000000..3a97e178bbd
--- /dev/null
+++ b/clang/lib/Tooling/Refactoring/SourceCode.cpp
@@ -0,0 +1,31 @@
+//===--- 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/Refactoring/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());
+}