forked from OSchip/llvm-project
229 lines
8.0 KiB
C++
229 lines
8.0 KiB
C++
//===--- Rewriter.cpp - Code rewriting interface --------------------------===//
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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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//
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// This file defines the Rewriter class, which is used for code
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// transformations.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/Rewrite/Rewriter.h"
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#include "clang/AST/Stmt.h"
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#include "clang/AST/Decl.h"
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#include "clang/Lex/Lexer.h"
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#include "clang/Basic/SourceManager.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace clang;
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void RewriteBuffer::RemoveText(unsigned OrigOffset, unsigned Size) {
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// Nothing to remove, exit early.
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if (Size == 0) return;
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unsigned RealOffset = getMappedOffset(OrigOffset, true);
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assert(RealOffset+Size < Buffer.size() && "Invalid location");
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// Remove the dead characters.
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Buffer.erase(RealOffset, Size);
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// Add a delta so that future changes are offset correctly.
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AddReplaceDelta(OrigOffset, -Size);
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}
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void RewriteBuffer::InsertText(unsigned OrigOffset,
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const char *StrData, unsigned StrLen,
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bool InsertAfter) {
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// Nothing to insert, exit early.
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if (StrLen == 0) return;
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unsigned RealOffset = getMappedOffset(OrigOffset, InsertAfter);
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Buffer.insert(RealOffset, StrData, StrData+StrLen);
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// Add a delta so that future changes are offset correctly.
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AddInsertDelta(OrigOffset, StrLen);
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}
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/// ReplaceText - This method replaces a range of characters in the input
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/// buffer with a new string. This is effectively a combined "remove+insert"
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/// operation.
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void RewriteBuffer::ReplaceText(unsigned OrigOffset, unsigned OrigLength,
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const char *NewStr, unsigned NewLength) {
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unsigned RealOffset = getMappedOffset(OrigOffset, true);
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Buffer.erase(RealOffset, OrigLength);
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Buffer.insert(RealOffset, NewStr, NewStr+NewLength);
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if (OrigLength != NewLength)
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AddReplaceDelta(OrigOffset, NewLength-OrigLength);
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}
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//===----------------------------------------------------------------------===//
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// Rewriter class
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//===----------------------------------------------------------------------===//
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/// getRangeSize - Return the size in bytes of the specified range if they
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/// are in the same file. If not, this returns -1.
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int Rewriter::getRangeSize(SourceRange Range) const {
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if (!isRewritable(Range.getBegin()) ||
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!isRewritable(Range.getEnd())) return -1;
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FileID StartFileID, EndFileID;
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unsigned StartOff, EndOff;
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StartOff = getLocationOffsetAndFileID(Range.getBegin(), StartFileID);
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EndOff = getLocationOffsetAndFileID(Range.getEnd(), EndFileID);
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if (StartFileID != EndFileID)
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return -1;
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// If edits have been made to this buffer, the delta between the range may
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// have changed.
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std::map<FileID, RewriteBuffer>::const_iterator I =
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RewriteBuffers.find(StartFileID);
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if (I != RewriteBuffers.end()) {
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const RewriteBuffer &RB = I->second;
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EndOff = RB.getMappedOffset(EndOff, true);
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StartOff = RB.getMappedOffset(StartOff);
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}
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// Adjust the end offset to the end of the last token, instead of being the
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// start of the last token.
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EndOff += Lexer::MeasureTokenLength(Range.getEnd(), *SourceMgr, *LangOpts);
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return EndOff-StartOff;
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}
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/// getRewritenText - Return the rewritten form of the text in the specified
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/// range. If the start or end of the range was unrewritable or if they are
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/// in different buffers, this returns an empty string.
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///
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/// Note that this method is not particularly efficient.
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///
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std::string Rewriter::getRewritenText(SourceRange Range) const {
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if (!isRewritable(Range.getBegin()) ||
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!isRewritable(Range.getEnd()))
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return "";
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FileID StartFileID, EndFileID;
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unsigned StartOff, EndOff;
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StartOff = getLocationOffsetAndFileID(Range.getBegin(), StartFileID);
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EndOff = getLocationOffsetAndFileID(Range.getEnd(), EndFileID);
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if (StartFileID != EndFileID)
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return ""; // Start and end in different buffers.
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// If edits have been made to this buffer, the delta between the range may
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// have changed.
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std::map<FileID, RewriteBuffer>::const_iterator I =
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RewriteBuffers.find(StartFileID);
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if (I == RewriteBuffers.end()) {
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// If the buffer hasn't been rewritten, just return the text from the input.
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const char *Ptr = SourceMgr->getCharacterData(Range.getBegin());
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// Adjust the end offset to the end of the last token, instead of being the
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// start of the last token.
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EndOff += Lexer::MeasureTokenLength(Range.getEnd(), *SourceMgr, *LangOpts);
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return std::string(Ptr, Ptr+EndOff-StartOff);
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}
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const RewriteBuffer &RB = I->second;
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EndOff = RB.getMappedOffset(EndOff, true);
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StartOff = RB.getMappedOffset(StartOff);
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// Adjust the end offset to the end of the last token, instead of being the
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// start of the last token.
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EndOff += Lexer::MeasureTokenLength(Range.getEnd(), *SourceMgr, *LangOpts);
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// Advance the iterators to the right spot, yay for linear time algorithms.
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RewriteBuffer::iterator Start = RB.begin();
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std::advance(Start, StartOff);
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RewriteBuffer::iterator End = Start;
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std::advance(End, EndOff-StartOff);
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return std::string(Start, End);
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}
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unsigned Rewriter::getLocationOffsetAndFileID(SourceLocation Loc,
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FileID &FID) const {
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assert(Loc.isValid() && "Invalid location");
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std::pair<FileID,unsigned> V = SourceMgr->getDecomposedLoc(Loc);
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FID = V.first;
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return V.second;
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}
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/// getEditBuffer - Get or create a RewriteBuffer for the specified FileID.
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///
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RewriteBuffer &Rewriter::getEditBuffer(FileID FID) {
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std::map<FileID, RewriteBuffer>::iterator I =
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RewriteBuffers.lower_bound(FID);
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if (I != RewriteBuffers.end() && I->first == FID)
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return I->second;
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I = RewriteBuffers.insert(I, std::make_pair(FID, RewriteBuffer()));
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std::pair<const char*, const char*> MB = SourceMgr->getBufferData(FID);
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I->second.Initialize(MB.first, MB.second);
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return I->second;
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}
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/// InsertText - Insert the specified string at the specified location in the
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/// original buffer.
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bool Rewriter::InsertText(SourceLocation Loc, const char *StrData,
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unsigned StrLen, bool InsertAfter) {
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if (!isRewritable(Loc)) return true;
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FileID FID;
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unsigned StartOffs = getLocationOffsetAndFileID(Loc, FID);
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getEditBuffer(FID).InsertText(StartOffs, StrData, StrLen, InsertAfter);
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return false;
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}
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/// RemoveText - Remove the specified text region.
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bool Rewriter::RemoveText(SourceLocation Start, unsigned Length) {
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if (!isRewritable(Start)) return true;
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FileID FID;
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unsigned StartOffs = getLocationOffsetAndFileID(Start, FID);
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getEditBuffer(FID).RemoveText(StartOffs, Length);
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return false;
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}
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/// ReplaceText - This method replaces a range of characters in the input
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/// buffer with a new string. This is effectively a combined "remove/insert"
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/// operation.
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bool Rewriter::ReplaceText(SourceLocation Start, unsigned OrigLength,
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const char *NewStr, unsigned NewLength) {
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if (!isRewritable(Start)) return true;
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FileID StartFileID;
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unsigned StartOffs = getLocationOffsetAndFileID(Start, StartFileID);
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getEditBuffer(StartFileID).ReplaceText(StartOffs, OrigLength,
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NewStr, NewLength);
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return false;
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}
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/// ReplaceStmt - This replaces a Stmt/Expr with another, using the pretty
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/// printer to generate the replacement code. This returns true if the input
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/// could not be rewritten, or false if successful.
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bool Rewriter::ReplaceStmt(Stmt *From, Stmt *To) {
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// Measaure the old text.
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int Size = getRangeSize(From->getSourceRange());
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if (Size == -1)
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return true;
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// Get the new text.
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std::string SStr;
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llvm::raw_string_ostream S(SStr);
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To->printPretty(S, 0, PrintingPolicy(*LangOpts));
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const std::string &Str = S.str();
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ReplaceText(From->getLocStart(), Size, &Str[0], Str.size());
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return false;
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}
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