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//===--- AffectedRangeManager.cpp - Format C++ code -----------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
///
/// \file
/// This file implements AffectRangeManager class.
///
//===----------------------------------------------------------------------===//
#include "AffectedRangeManager.h"
#include "FormatToken.h"
#include "TokenAnnotator.h"
namespace clang {
namespace format {
bool AffectedRangeManager::computeAffectedLines(
SmallVectorImpl<AnnotatedLine *> &Lines) {
SmallVectorImpl<AnnotatedLine *>::iterator I = Lines.begin();
SmallVectorImpl<AnnotatedLine *>::iterator E = Lines.end();
bool SomeLineAffected = false;
const AnnotatedLine *PreviousLine = nullptr;
while (I != E) {
AnnotatedLine *Line = *I;
assert(Line->First);
Line->LeadingEmptyLinesAffected = affectsLeadingEmptyLines(*Line->First);
// If a line is part of a preprocessor directive, it needs to be formatted
// if any token within the directive is affected.
if (Line->InPPDirective) {
FormatToken *Last = Line->Last;
SmallVectorImpl<AnnotatedLine *>::iterator PPEnd = I + 1;
while (PPEnd != E && !(*PPEnd)->First->HasUnescapedNewline) {
Last = (*PPEnd)->Last;
++PPEnd;
}
if (affectsTokenRange(*Line->First, *Last,
/*IncludeLeadingNewlines=*/false)) {
SomeLineAffected = true;
markAllAsAffected(I, PPEnd);
}
I = PPEnd;
continue;
}
if (nonPPLineAffected(Line, PreviousLine, Lines))
SomeLineAffected = true;
PreviousLine = Line;
++I;
}
return SomeLineAffected;
}
bool AffectedRangeManager::affectsCharSourceRange(
const CharSourceRange &Range) {
for (const CharSourceRange &R : Ranges) {
if (!SourceMgr.isBeforeInTranslationUnit(Range.getEnd(), R.getBegin()) &&
!SourceMgr.isBeforeInTranslationUnit(R.getEnd(), Range.getBegin())) {
return true;
}
}
return false;
}
bool AffectedRangeManager::affectsTokenRange(const FormatToken &First,
const FormatToken &Last,
bool IncludeLeadingNewlines) {
SourceLocation Start = First.WhitespaceRange.getBegin();
if (!IncludeLeadingNewlines)
Start = Start.getLocWithOffset(First.LastNewlineOffset);
SourceLocation End = Last.getStartOfNonWhitespace();
End = End.getLocWithOffset(Last.TokenText.size());
CharSourceRange Range = CharSourceRange::getCharRange(Start, End);
return affectsCharSourceRange(Range);
}
bool AffectedRangeManager::affectsLeadingEmptyLines(const FormatToken &Tok) {
CharSourceRange EmptyLineRange = CharSourceRange::getCharRange(
Tok.WhitespaceRange.getBegin(),
Tok.WhitespaceRange.getBegin().getLocWithOffset(Tok.LastNewlineOffset));
return affectsCharSourceRange(EmptyLineRange);
}
void AffectedRangeManager::markAllAsAffected(
SmallVectorImpl<AnnotatedLine *>::iterator I,
SmallVectorImpl<AnnotatedLine *>::iterator E) {
while (I != E) {
(*I)->Affected = true;
markAllAsAffected((*I)->Children.begin(), (*I)->Children.end());
++I;
}
}
bool AffectedRangeManager::nonPPLineAffected(
AnnotatedLine *Line, const AnnotatedLine *PreviousLine,
SmallVectorImpl<AnnotatedLine *> &Lines) {
bool SomeLineAffected = false;
Line->ChildrenAffected = computeAffectedLines(Line->Children);
if (Line->ChildrenAffected)
SomeLineAffected = true;
// Stores whether one of the line's tokens is directly affected.
bool SomeTokenAffected = false;
// Stores whether we need to look at the leading newlines of the next token
// in order to determine whether it was affected.
bool IncludeLeadingNewlines = false;
// Stores whether the first child line of any of this line's tokens is
// affected.
bool SomeFirstChildAffected = false;
assert(Line->First);
for (FormatToken *Tok = Line->First; Tok; Tok = Tok->Next) {
// Determine whether 'Tok' was affected.
if (affectsTokenRange(*Tok, *Tok, IncludeLeadingNewlines))
SomeTokenAffected = true;
// Determine whether the first child of 'Tok' was affected.
if (!Tok->Children.empty() && Tok->Children.front()->Affected)
SomeFirstChildAffected = true;
IncludeLeadingNewlines = Tok->Children.empty();
}
// Was this line moved, i.e. has it previously been on the same line as an
// affected line?
bool LineMoved = PreviousLine && PreviousLine->Affected &&
Line->First->NewlinesBefore == 0;
bool IsContinuedComment =
Line->First->is(tok::comment) && Line->First->Next == nullptr &&
Line->First->NewlinesBefore < 2 && PreviousLine &&
PreviousLine->Affected && PreviousLine->Last->is(tok::comment);
bool IsAffectedClosingBrace =
Line->First->is(tok::r_brace) &&
Line->MatchingOpeningBlockLineIndex != UnwrappedLine::kInvalidIndex &&
Lines[Line->MatchingOpeningBlockLineIndex]->Affected;
if (SomeTokenAffected || SomeFirstChildAffected || LineMoved ||
IsContinuedComment || IsAffectedClosingBrace) {
Line->Affected = true;
SomeLineAffected = true;
}
return SomeLineAffected;
}
} // namespace format
} // namespace clang
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