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