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llvm-project/clang/lib/Edit/EditedSource.cpp

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//===----- EditedSource.cpp - Collection of source edits ------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "clang/Edit/EditedSource.h"
#include "clang/Basic/CharInfo.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Edit/Commit.h"
#include "clang/Edit/EditsReceiver.h"
#include "clang/Lex/Lexer.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/Twine.h"
using namespace clang;
using namespace edit;
void EditsReceiver::remove(CharSourceRange range) {
replace(range, StringRef());
}
StringRef EditedSource::copyString(const Twine &twine) {
SmallString<128> Data;
return copyString(twine.toStringRef(Data));
}
bool EditedSource::canInsertInOffset(SourceLocation OrigLoc, FileOffset Offs) {
FileEditsTy::iterator FA = getActionForOffset(Offs);
if (FA != FileEdits.end()) {
if (FA->first != Offs)
return false; // position has been removed.
}
if (SourceMgr.isMacroArgExpansion(OrigLoc)) {
SourceLocation
DefArgLoc = SourceMgr.getImmediateExpansionRange(OrigLoc).first;
SourceLocation
ExpLoc = SourceMgr.getImmediateExpansionRange(DefArgLoc).first;
llvm::DenseMap<unsigned, SourceLocation>::iterator
I = ExpansionToArgMap.find(ExpLoc.getRawEncoding());
if (I != ExpansionToArgMap.end() && I->second != DefArgLoc)
return false; // Trying to write in a macro argument input that has
// already been written for another argument of the same macro.
}
return true;
}
bool EditedSource::commitInsert(SourceLocation OrigLoc,
FileOffset Offs, StringRef text,
bool beforePreviousInsertions) {
if (!canInsertInOffset(OrigLoc, Offs))
return false;
if (text.empty())
return true;
if (SourceMgr.isMacroArgExpansion(OrigLoc)) {
SourceLocation
DefArgLoc = SourceMgr.getImmediateExpansionRange(OrigLoc).first;
SourceLocation
ExpLoc = SourceMgr.getImmediateExpansionRange(DefArgLoc).first;
ExpansionToArgMap[ExpLoc.getRawEncoding()] = DefArgLoc;
}
FileEdit &FA = FileEdits[Offs];
if (FA.Text.empty()) {
FA.Text = copyString(text);
return true;
}
if (beforePreviousInsertions)
FA.Text = copyString(Twine(text) + FA.Text);
else
FA.Text = copyString(Twine(FA.Text) + text);
return true;
}
bool EditedSource::commitInsertFromRange(SourceLocation OrigLoc,
FileOffset Offs,
FileOffset InsertFromRangeOffs, unsigned Len,
bool beforePreviousInsertions) {
if (Len == 0)
return true;
SmallString<128> StrVec;
FileOffset BeginOffs = InsertFromRangeOffs;
FileOffset EndOffs = BeginOffs.getWithOffset(Len);
FileEditsTy::iterator I = FileEdits.upper_bound(BeginOffs);
if (I != FileEdits.begin())
--I;
for (; I != FileEdits.end(); ++I) {
FileEdit &FA = I->second;
FileOffset B = I->first;
FileOffset E = B.getWithOffset(FA.RemoveLen);
if (BeginOffs == B)
break;
if (BeginOffs < E) {
if (BeginOffs > B) {
BeginOffs = E;
++I;
}
break;
}
}
for (; I != FileEdits.end() && EndOffs > I->first; ++I) {
FileEdit &FA = I->second;
FileOffset B = I->first;
FileOffset E = B.getWithOffset(FA.RemoveLen);
if (BeginOffs < B) {
bool Invalid = false;
StringRef text = getSourceText(BeginOffs, B, Invalid);
if (Invalid)
return false;
StrVec += text;
}
StrVec += FA.Text;
BeginOffs = E;
}
if (BeginOffs < EndOffs) {
bool Invalid = false;
StringRef text = getSourceText(BeginOffs, EndOffs, Invalid);
if (Invalid)
return false;
StrVec += text;
}
return commitInsert(OrigLoc, Offs, StrVec.str(), beforePreviousInsertions);
}
void EditedSource::commitRemove(SourceLocation OrigLoc,
FileOffset BeginOffs, unsigned Len) {
if (Len == 0)
return;
FileOffset EndOffs = BeginOffs.getWithOffset(Len);
FileEditsTy::iterator I = FileEdits.upper_bound(BeginOffs);
if (I != FileEdits.begin())
--I;
for (; I != FileEdits.end(); ++I) {
FileEdit &FA = I->second;
FileOffset B = I->first;
FileOffset E = B.getWithOffset(FA.RemoveLen);
if (BeginOffs < E)
break;
}
FileOffset TopBegin, TopEnd;
FileEdit *TopFA = nullptr;
if (I == FileEdits.end()) {
FileEditsTy::iterator
NewI = FileEdits.insert(I, std::make_pair(BeginOffs, FileEdit()));
NewI->second.RemoveLen = Len;
return;
}
FileEdit &FA = I->second;
FileOffset B = I->first;
FileOffset E = B.getWithOffset(FA.RemoveLen);
if (BeginOffs < B) {
FileEditsTy::iterator
NewI = FileEdits.insert(I, std::make_pair(BeginOffs, FileEdit()));
TopBegin = BeginOffs;
TopEnd = EndOffs;
TopFA = &NewI->second;
TopFA->RemoveLen = Len;
} else {
TopBegin = B;
TopEnd = E;
TopFA = &I->second;
if (TopEnd >= EndOffs)
return;
unsigned diff = EndOffs.getOffset() - TopEnd.getOffset();
TopEnd = EndOffs;
TopFA->RemoveLen += diff;
if (B == BeginOffs)
TopFA->Text = StringRef();
++I;
}
while (I != FileEdits.end()) {
FileEdit &FA = I->second;
FileOffset B = I->first;
FileOffset E = B.getWithOffset(FA.RemoveLen);
if (B >= TopEnd)
break;
if (E <= TopEnd) {
FileEdits.erase(I++);
continue;
}
if (B < TopEnd) {
unsigned diff = E.getOffset() - TopEnd.getOffset();
TopEnd = E;
TopFA->RemoveLen += diff;
FileEdits.erase(I);
}
break;
}
}
bool EditedSource::commit(const Commit &commit) {
if (!commit.isCommitable())
return false;
for (edit::Commit::edit_iterator
I = commit.edit_begin(), E = commit.edit_end(); I != E; ++I) {
const edit::Commit::Edit &edit = *I;
switch (edit.Kind) {
case edit::Commit::Act_Insert:
commitInsert(edit.OrigLoc, edit.Offset, edit.Text, edit.BeforePrev);
break;
case edit::Commit::Act_InsertFromRange:
commitInsertFromRange(edit.OrigLoc, edit.Offset,
edit.InsertFromRangeOffs, edit.Length,
edit.BeforePrev);
break;
case edit::Commit::Act_Remove:
commitRemove(edit.OrigLoc, edit.Offset, edit.Length);
break;
}
}
return true;
}
// \brief Returns true if it is ok to make the two given characters adjacent.
static bool canBeJoined(char left, char right, const LangOptions &LangOpts) {
// FIXME: Should use TokenConcatenation to make sure we don't allow stuff like
// making two '<' adjacent.
return !(Lexer::isIdentifierBodyChar(left, LangOpts) &&
Lexer::isIdentifierBodyChar(right, LangOpts));
}
/// \brief Returns true if it is ok to eliminate the trailing whitespace between
/// the given characters.
static bool canRemoveWhitespace(char left, char beforeWSpace, char right,
const LangOptions &LangOpts) {
if (!canBeJoined(left, right, LangOpts))
return false;
if (isWhitespace(left) || isWhitespace(right))
return true;
if (canBeJoined(beforeWSpace, right, LangOpts))
return false; // the whitespace was intentional, keep it.
return true;
}
/// \brief Check the range that we are going to remove and:
/// -Remove any trailing whitespace if possible.
/// -Insert a space if removing the range is going to mess up the source tokens.
static void adjustRemoval(const SourceManager &SM, const LangOptions &LangOpts,
SourceLocation Loc, FileOffset offs,
unsigned &len, StringRef &text) {
assert(len && text.empty());
SourceLocation BeginTokLoc = Lexer::GetBeginningOfToken(Loc, SM, LangOpts);
if (BeginTokLoc != Loc)
return; // the range is not at the beginning of a token, keep the range.
bool Invalid = false;
StringRef buffer = SM.getBufferData(offs.getFID(), &Invalid);
if (Invalid)
return;
unsigned begin = offs.getOffset();
unsigned end = begin + len;
// FIXME: Remove newline.
if (begin == 0) {
if (buffer[end] == ' ')
++len;
return;
}
if (buffer[end] == ' ') {
if (canRemoveWhitespace(/*left=*/buffer[begin-1],
/*beforeWSpace=*/buffer[end-1],
/*right=*/buffer[end+1],
LangOpts))
++len;
return;
}
if (!canBeJoined(buffer[begin-1], buffer[end], LangOpts))
text = " ";
}
static void applyRewrite(EditsReceiver &receiver,
StringRef text, FileOffset offs, unsigned len,
const SourceManager &SM, const LangOptions &LangOpts) {
assert(!offs.getFID().isInvalid());
SourceLocation Loc = SM.getLocForStartOfFile(offs.getFID());
Loc = Loc.getLocWithOffset(offs.getOffset());
assert(Loc.isFileID());
if (text.empty())
adjustRemoval(SM, LangOpts, Loc, offs, len, text);
CharSourceRange range = CharSourceRange::getCharRange(Loc,
Loc.getLocWithOffset(len));
if (text.empty()) {
assert(len);
receiver.remove(range);
return;
}
if (len)
receiver.replace(range, text);
else
receiver.insert(Loc, text);
}
void EditedSource::applyRewrites(EditsReceiver &receiver) {
SmallString<128> StrVec;
FileOffset CurOffs, CurEnd;
unsigned CurLen;
if (FileEdits.empty())
return;
FileEditsTy::iterator I = FileEdits.begin();
CurOffs = I->first;
StrVec = I->second.Text;
CurLen = I->second.RemoveLen;
CurEnd = CurOffs.getWithOffset(CurLen);
++I;
for (FileEditsTy::iterator E = FileEdits.end(); I != E; ++I) {
FileOffset offs = I->first;
FileEdit act = I->second;
assert(offs >= CurEnd);
if (offs == CurEnd) {
StrVec += act.Text;
CurLen += act.RemoveLen;
CurEnd.getWithOffset(act.RemoveLen);
continue;
}
applyRewrite(receiver, StrVec.str(), CurOffs, CurLen, SourceMgr, LangOpts);
CurOffs = offs;
StrVec = act.Text;
CurLen = act.RemoveLen;
CurEnd = CurOffs.getWithOffset(CurLen);
}
applyRewrite(receiver, StrVec.str(), CurOffs, CurLen, SourceMgr, LangOpts);
}
void EditedSource::clearRewrites() {
FileEdits.clear();
StrAlloc.Reset();
}
StringRef EditedSource::getSourceText(FileOffset BeginOffs, FileOffset EndOffs,
bool &Invalid) {
assert(BeginOffs.getFID() == EndOffs.getFID());
assert(BeginOffs <= EndOffs);
SourceLocation BLoc = SourceMgr.getLocForStartOfFile(BeginOffs.getFID());
BLoc = BLoc.getLocWithOffset(BeginOffs.getOffset());
assert(BLoc.isFileID());
SourceLocation
ELoc = BLoc.getLocWithOffset(EndOffs.getOffset() - BeginOffs.getOffset());
return Lexer::getSourceText(CharSourceRange::getCharRange(BLoc, ELoc),
SourceMgr, LangOpts, &Invalid);
}
EditedSource::FileEditsTy::iterator
EditedSource::getActionForOffset(FileOffset Offs) {
FileEditsTy::iterator I = FileEdits.upper_bound(Offs);
if (I == FileEdits.begin())
return FileEdits.end();
--I;
FileEdit &FA = I->second;
FileOffset B = I->first;
FileOffset E = B.getWithOffset(FA.RemoveLen);
if (Offs >= B && Offs < E)
return I;
return FileEdits.end();
}
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