321 lines
13 KiB
C++
321 lines
13 KiB
C++
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//===--- WhitespaceManager.cpp - Format C++ code --------------------------===//
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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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/// \file
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/// \brief This file implements WhitespaceManager class.
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///
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//===----------------------------------------------------------------------===//
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#include "WhitespaceManager.h"
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#include "llvm/ADT/STLExtras.h"
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namespace clang {
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namespace format {
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bool
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WhitespaceManager::Change::IsBeforeInFile::operator()(const Change &C1,
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const Change &C2) const {
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return SourceMgr.isBeforeInTranslationUnit(
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C1.OriginalWhitespaceRange.getBegin(),
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C2.OriginalWhitespaceRange.getBegin());
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}
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WhitespaceManager::Change::Change(
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bool CreateReplacement, const SourceRange &OriginalWhitespaceRange,
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unsigned IndentLevel, unsigned Spaces, unsigned StartOfTokenColumn,
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unsigned NewlinesBefore, StringRef PreviousLinePostfix,
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StringRef CurrentLinePrefix, tok::TokenKind Kind, bool ContinuesPPDirective)
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: CreateReplacement(CreateReplacement),
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OriginalWhitespaceRange(OriginalWhitespaceRange),
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StartOfTokenColumn(StartOfTokenColumn), NewlinesBefore(NewlinesBefore),
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PreviousLinePostfix(PreviousLinePostfix),
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CurrentLinePrefix(CurrentLinePrefix), Kind(Kind),
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ContinuesPPDirective(ContinuesPPDirective), IndentLevel(IndentLevel),
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Spaces(Spaces) {}
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void WhitespaceManager::reset() {
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Changes.clear();
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Replaces.clear();
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}
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void WhitespaceManager::replaceWhitespace(FormatToken &Tok, unsigned Newlines,
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unsigned IndentLevel, unsigned Spaces,
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unsigned StartOfTokenColumn,
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bool InPPDirective) {
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if (Tok.Finalized)
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return;
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Tok.Decision = (Newlines > 0) ? FD_Break : FD_Continue;
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Changes.push_back(Change(true, Tok.WhitespaceRange, IndentLevel, Spaces,
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StartOfTokenColumn, Newlines, "", "",
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Tok.Tok.getKind(), InPPDirective && !Tok.IsFirst));
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}
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void WhitespaceManager::addUntouchableToken(const FormatToken &Tok,
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bool InPPDirective) {
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if (Tok.Finalized)
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return;
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Changes.push_back(Change(false, Tok.WhitespaceRange, /*IndentLevel=*/0,
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/*Spaces=*/0, Tok.OriginalColumn, Tok.NewlinesBefore,
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"", "", Tok.Tok.getKind(),
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InPPDirective && !Tok.IsFirst));
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}
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void WhitespaceManager::replaceWhitespaceInToken(
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const FormatToken &Tok, unsigned Offset, unsigned ReplaceChars,
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StringRef PreviousPostfix, StringRef CurrentPrefix, bool InPPDirective,
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unsigned Newlines, unsigned IndentLevel, unsigned Spaces) {
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if (Tok.Finalized)
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return;
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Changes.push_back(Change(
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true, SourceRange(Tok.getStartOfNonWhitespace().getLocWithOffset(Offset),
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Tok.getStartOfNonWhitespace().getLocWithOffset(
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Offset + ReplaceChars)),
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IndentLevel, Spaces, Spaces, Newlines, PreviousPostfix, CurrentPrefix,
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// If we don't add a newline this change doesn't start a comment. Thus,
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// when we align line comments, we don't need to treat this change as one.
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// FIXME: We still need to take this change in account to properly
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// calculate the new length of the comment and to calculate the changes
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// for which to do the alignment when aligning comments.
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Tok.Type == TT_LineComment && Newlines > 0 ? tok::comment : tok::unknown,
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InPPDirective && !Tok.IsFirst));
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}
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const tooling::Replacements &WhitespaceManager::generateReplacements() {
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if (Changes.empty())
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return Replaces;
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std::sort(Changes.begin(), Changes.end(), Change::IsBeforeInFile(SourceMgr));
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calculateLineBreakInformation();
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alignTrailingComments();
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alignEscapedNewlines();
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generateChanges();
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return Replaces;
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}
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void WhitespaceManager::calculateLineBreakInformation() {
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Changes[0].PreviousEndOfTokenColumn = 0;
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for (unsigned i = 1, e = Changes.size(); i != e; ++i) {
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unsigned OriginalWhitespaceStart =
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SourceMgr.getFileOffset(Changes[i].OriginalWhitespaceRange.getBegin());
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unsigned PreviousOriginalWhitespaceEnd = SourceMgr.getFileOffset(
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Changes[i - 1].OriginalWhitespaceRange.getEnd());
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Changes[i - 1].TokenLength = OriginalWhitespaceStart -
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PreviousOriginalWhitespaceEnd +
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Changes[i].PreviousLinePostfix.size() +
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Changes[i - 1].CurrentLinePrefix.size();
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Changes[i].PreviousEndOfTokenColumn =
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Changes[i - 1].StartOfTokenColumn + Changes[i - 1].TokenLength;
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Changes[i - 1].IsTrailingComment =
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(Changes[i].NewlinesBefore > 0 || Changes[i].Kind == tok::eof) &&
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Changes[i - 1].Kind == tok::comment;
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}
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// FIXME: The last token is currently not always an eof token; in those
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// cases, setting TokenLength of the last token to 0 is wrong.
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Changes.back().TokenLength = 0;
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Changes.back().IsTrailingComment = Changes.back().Kind == tok::comment;
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}
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void WhitespaceManager::alignTrailingComments() {
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unsigned MinColumn = 0;
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unsigned MaxColumn = UINT_MAX;
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unsigned StartOfSequence = 0;
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bool BreakBeforeNext = false;
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unsigned Newlines = 0;
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for (unsigned i = 0, e = Changes.size(); i != e; ++i) {
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unsigned ChangeMinColumn = Changes[i].StartOfTokenColumn;
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// FIXME: Correctly handle ChangeMaxColumn in PP directives.
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unsigned ChangeMaxColumn = Style.ColumnLimit - Changes[i].TokenLength;
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Newlines += Changes[i].NewlinesBefore;
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if (Changes[i].IsTrailingComment) {
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// If this comment follows an } in column 0, it probably documents the
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// closing of a namespace and we don't want to align it.
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bool FollowsRBraceInColumn0 = i > 0 && Changes[i].NewlinesBefore == 0 &&
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Changes[i - 1].Kind == tok::r_brace &&
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Changes[i - 1].StartOfTokenColumn == 0;
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bool WasAlignedWithStartOfNextLine = false;
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if (Changes[i].NewlinesBefore == 1) { // A comment on its own line.
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for (unsigned j = i + 1; j != e; ++j) {
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if (Changes[j].Kind != tok::comment) { // Skip over comments.
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// The start of the next token was previously aligned with the
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// start of this comment.
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WasAlignedWithStartOfNextLine =
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(SourceMgr.getSpellingColumnNumber(
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Changes[i].OriginalWhitespaceRange.getEnd()) ==
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SourceMgr.getSpellingColumnNumber(
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Changes[j].OriginalWhitespaceRange.getEnd()));
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break;
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}
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}
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}
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if (!Style.AlignTrailingComments || FollowsRBraceInColumn0) {
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alignTrailingComments(StartOfSequence, i, MinColumn);
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MinColumn = ChangeMinColumn;
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MaxColumn = ChangeMinColumn;
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StartOfSequence = i;
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} else if (BreakBeforeNext || Newlines > 1 ||
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(ChangeMinColumn > MaxColumn || ChangeMaxColumn < MinColumn) ||
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// Break the comment sequence if the previous line did not end
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// in a trailing comment.
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(Changes[i].NewlinesBefore == 1 && i > 0 &&
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!Changes[i - 1].IsTrailingComment) ||
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WasAlignedWithStartOfNextLine) {
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alignTrailingComments(StartOfSequence, i, MinColumn);
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MinColumn = ChangeMinColumn;
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MaxColumn = ChangeMaxColumn;
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StartOfSequence = i;
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} else {
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MinColumn = std::max(MinColumn, ChangeMinColumn);
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MaxColumn = std::min(MaxColumn, ChangeMaxColumn);
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}
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BreakBeforeNext =
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(i == 0) || (Changes[i].NewlinesBefore > 1) ||
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// Never start a sequence with a comment at the beginning of
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// the line.
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(Changes[i].NewlinesBefore == 1 && StartOfSequence == i);
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Newlines = 0;
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}
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}
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alignTrailingComments(StartOfSequence, Changes.size(), MinColumn);
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}
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void WhitespaceManager::alignTrailingComments(unsigned Start, unsigned End,
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unsigned Column) {
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for (unsigned i = Start; i != End; ++i) {
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if (Changes[i].IsTrailingComment) {
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assert(Column >= Changes[i].StartOfTokenColumn);
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Changes[i].Spaces += Column - Changes[i].StartOfTokenColumn;
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Changes[i].StartOfTokenColumn = Column;
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}
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}
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}
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void WhitespaceManager::alignEscapedNewlines() {
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unsigned MaxEndOfLine =
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Style.AlignEscapedNewlinesLeft ? 0 : Style.ColumnLimit;
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unsigned StartOfMacro = 0;
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for (unsigned i = 1, e = Changes.size(); i < e; ++i) {
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Change &C = Changes[i];
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if (C.NewlinesBefore > 0) {
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if (C.ContinuesPPDirective) {
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MaxEndOfLine = std::max(C.PreviousEndOfTokenColumn + 2, MaxEndOfLine);
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} else {
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alignEscapedNewlines(StartOfMacro + 1, i, MaxEndOfLine);
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MaxEndOfLine = Style.AlignEscapedNewlinesLeft ? 0 : Style.ColumnLimit;
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StartOfMacro = i;
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}
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}
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}
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alignEscapedNewlines(StartOfMacro + 1, Changes.size(), MaxEndOfLine);
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}
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void WhitespaceManager::alignEscapedNewlines(unsigned Start, unsigned End,
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unsigned Column) {
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for (unsigned i = Start; i < End; ++i) {
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Change &C = Changes[i];
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if (C.NewlinesBefore > 0) {
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assert(C.ContinuesPPDirective);
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if (C.PreviousEndOfTokenColumn + 1 > Column)
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C.EscapedNewlineColumn = 0;
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else
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C.EscapedNewlineColumn = Column;
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}
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}
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}
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void WhitespaceManager::generateChanges() {
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for (unsigned i = 0, e = Changes.size(); i != e; ++i) {
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const Change &C = Changes[i];
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if (C.CreateReplacement) {
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std::string ReplacementText = C.PreviousLinePostfix;
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if (C.ContinuesPPDirective)
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appendNewlineText(ReplacementText, C.NewlinesBefore,
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C.PreviousEndOfTokenColumn, C.EscapedNewlineColumn);
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else
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appendNewlineText(ReplacementText, C.NewlinesBefore);
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appendIndentText(ReplacementText, C.IndentLevel, C.Spaces,
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C.StartOfTokenColumn - C.Spaces);
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ReplacementText.append(C.CurrentLinePrefix);
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storeReplacement(C.OriginalWhitespaceRange, ReplacementText);
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}
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}
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}
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void WhitespaceManager::storeReplacement(const SourceRange &Range,
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StringRef Text) {
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unsigned WhitespaceLength = SourceMgr.getFileOffset(Range.getEnd()) -
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SourceMgr.getFileOffset(Range.getBegin());
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// Don't create a replacement, if it does not change anything.
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if (StringRef(SourceMgr.getCharacterData(Range.getBegin()),
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WhitespaceLength) == Text)
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return;
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Replaces.insert(tooling::Replacement(
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SourceMgr, CharSourceRange::getCharRange(Range), Text));
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}
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void WhitespaceManager::appendNewlineText(std::string &Text,
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unsigned Newlines) {
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for (unsigned i = 0; i < Newlines; ++i)
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Text.append(UseCRLF ? "\r\n" : "\n");
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}
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void WhitespaceManager::appendNewlineText(std::string &Text, unsigned Newlines,
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unsigned PreviousEndOfTokenColumn,
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unsigned EscapedNewlineColumn) {
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if (Newlines > 0) {
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unsigned Offset =
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std::min<int>(EscapedNewlineColumn - 1, PreviousEndOfTokenColumn);
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for (unsigned i = 0; i < Newlines; ++i) {
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Text.append(std::string(EscapedNewlineColumn - Offset - 1, ' '));
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Text.append(UseCRLF ? "\\\r\n" : "\\\n");
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Offset = 0;
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}
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}
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}
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void WhitespaceManager::appendIndentText(std::string &Text,
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unsigned IndentLevel, unsigned Spaces,
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unsigned WhitespaceStartColumn) {
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switch (Style.UseTab) {
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case FormatStyle::UT_Never:
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Text.append(std::string(Spaces, ' '));
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break;
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case FormatStyle::UT_Always: {
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unsigned FirstTabWidth =
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Style.TabWidth - WhitespaceStartColumn % Style.TabWidth;
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// Indent with tabs only when there's at least one full tab.
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if (FirstTabWidth + Style.TabWidth <= Spaces) {
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Spaces -= FirstTabWidth;
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Text.append("\t");
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}
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Text.append(std::string(Spaces / Style.TabWidth, '\t'));
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Text.append(std::string(Spaces % Style.TabWidth, ' '));
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break;
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}
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case FormatStyle::UT_ForIndentation:
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if (WhitespaceStartColumn == 0) {
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unsigned Indentation = IndentLevel * Style.IndentWidth;
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// This happens, e.g. when a line in a block comment is indented less than
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// the first one.
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if (Indentation > Spaces)
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Indentation = Spaces;
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unsigned Tabs = Indentation / Style.TabWidth;
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Text.append(std::string(Tabs, '\t'));
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Spaces -= Tabs * Style.TabWidth;
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}
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Text.append(std::string(Spaces, ' '));
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break;
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}
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}
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} // namespace format
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} // namespace clang
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