114 lines
3.4 KiB
C++
114 lines
3.4 KiB
C++
//===- unittests/Rewrite/RewriteBufferTest.cpp - RewriteBuffer tests ------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "clang/Rewrite/Core/RewriteBuffer.h"
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#include "gtest/gtest.h"
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using namespace llvm;
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using namespace clang;
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namespace {
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#define EXPECT_OUTPUT(Buf, Output) EXPECT_EQ(Output, writeOutput(Buf))
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static std::string writeOutput(const RewriteBuffer &Buf) {
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std::string Result;
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raw_string_ostream OS(Result);
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Buf.write(OS);
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OS.flush();
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return Result;
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}
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static void tagRange(unsigned Offset, unsigned Len, StringRef tagName,
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RewriteBuffer &Buf) {
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std::string BeginTag;
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raw_string_ostream(BeginTag) << '<' << tagName << '>';
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std::string EndTag;
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raw_string_ostream(EndTag) << "</" << tagName << '>';
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Buf.InsertTextAfter(Offset, BeginTag);
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Buf.InsertTextBefore(Offset+Len, EndTag);
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}
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TEST(RewriteBuffer, TagRanges) {
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StringRef Input = "hello world";
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const char *Output = "<outer><inner>hello</inner></outer> ";
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RewriteBuffer Buf;
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Buf.Initialize(Input);
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StringRef RemoveStr = "world";
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size_t Pos = Input.find(RemoveStr);
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Buf.RemoveText(Pos, RemoveStr.size());
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StringRef TagStr = "hello";
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Pos = Input.find(TagStr);
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tagRange(Pos, TagStr.size(), "outer", Buf);
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tagRange(Pos, TagStr.size(), "inner", Buf);
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EXPECT_OUTPUT(Buf, Output);
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}
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TEST(RewriteBuffer, DISABLED_RemoveLineIfEmpty_XFAIL) {
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StringRef Input = "def\n"
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"ghi\n"
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"jkl\n";
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RewriteBuffer Buf;
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Buf.Initialize(Input);
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// Insert "abc\n" at the start.
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Buf.InsertText(0, "abc\n");
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EXPECT_OUTPUT(Buf, "abc\n"
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"def\n"
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"ghi\n"
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"jkl\n");
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// Remove "def\n".
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//
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// After the removal of "def", we have:
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//
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// "abc\n"
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// "\n"
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// "ghi\n"
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// "jkl\n"
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//
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// Because removeLineIfEmpty=true, RemoveText has to remove the "\n" left on
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// the line. This happens correctly for the rewrite buffer itself, so the
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// next check below passes.
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//
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// However, RemoveText's implementation incorrectly records the delta for
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// removing the "\n" using the rewrite buffer offset, 4, where it was
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// supposed to use the original input offset, 3. Interpreted as an original
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// input offset, 4 points to "g" not to "\n". Thus, any future modifications
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// at the original input's "g" will incorrectly see "g" as having become an
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// empty string and so will map to the next character, "h", in the rewrite
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// buffer.
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StringRef RemoveStr0 = "def";
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Buf.RemoveText(Input.find(RemoveStr0), RemoveStr0.size(),
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/*removeLineIfEmpty*/ true);
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EXPECT_OUTPUT(Buf, "abc\n"
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"ghi\n"
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"jkl\n");
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// Try to remove "ghi\n".
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//
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// As discussed above, the original input offset for "ghi\n" incorrectly
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// maps to the rewrite buffer offset for "hi\nj", so we end up with:
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//
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// "abc\n"
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// "gkl\n"
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//
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// To show that removeLineIfEmpty=true is the culprit, change true to false
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// and append a newline to RemoveStr0 above. The test then passes.
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StringRef RemoveStr1 = "ghi\n";
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Buf.RemoveText(Input.find(RemoveStr1), RemoveStr1.size());
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EXPECT_OUTPUT(Buf, "abc\n"
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"jkl\n");
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}
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} // anonymous namespace
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