/
UnwrappedLineParser.cpp
2523 lines (2338 loc) · 79.1 KB
/
UnwrappedLineParser.cpp
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//===--- UnwrappedLineParser.cpp - Format C++ code ------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
///
/// \file
/// \brief This file contains the implementation of the UnwrappedLineParser,
/// which turns a stream of tokens into UnwrappedLines.
///
//===----------------------------------------------------------------------===//
#include "UnwrappedLineParser.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#define DEBUG_TYPE "format-parser"
namespace clang {
namespace format {
class FormatTokenSource {
public:
virtual ~FormatTokenSource() {}
virtual FormatToken *getNextToken() = 0;
virtual unsigned getPosition() = 0;
virtual FormatToken *setPosition(unsigned Position) = 0;
};
namespace {
class ScopedDeclarationState {
public:
ScopedDeclarationState(UnwrappedLine &Line, std::vector<bool> &Stack,
bool MustBeDeclaration)
: Line(Line), Stack(Stack) {
Line.MustBeDeclaration = MustBeDeclaration;
Stack.push_back(MustBeDeclaration);
}
~ScopedDeclarationState() {
Stack.pop_back();
if (!Stack.empty())
Line.MustBeDeclaration = Stack.back();
else
Line.MustBeDeclaration = true;
}
private:
UnwrappedLine &Line;
std::vector<bool> &Stack;
};
static bool isLineComment(const FormatToken &FormatTok) {
return FormatTok.is(tok::comment) && !FormatTok.TokenText.startswith("/*");
}
// Checks if \p FormatTok is a line comment that continues the line comment
// \p Previous. The original column of \p MinColumnToken is used to determine
// whether \p FormatTok is indented enough to the right to continue \p Previous.
static bool continuesLineComment(const FormatToken &FormatTok,
const FormatToken *Previous,
const FormatToken *MinColumnToken) {
if (!Previous || !MinColumnToken)
return false;
unsigned MinContinueColumn =
MinColumnToken->OriginalColumn + (isLineComment(*MinColumnToken) ? 0 : 1);
return isLineComment(FormatTok) && FormatTok.NewlinesBefore == 1 &&
isLineComment(*Previous) &&
FormatTok.OriginalColumn >= MinContinueColumn;
}
class ScopedMacroState : public FormatTokenSource {
public:
ScopedMacroState(UnwrappedLine &Line, FormatTokenSource *&TokenSource,
FormatToken *&ResetToken)
: Line(Line), TokenSource(TokenSource), ResetToken(ResetToken),
PreviousLineLevel(Line.Level), PreviousTokenSource(TokenSource),
Token(nullptr), PreviousToken(nullptr) {
TokenSource = this;
Line.Level = 0;
Line.InPPDirective = true;
}
~ScopedMacroState() override {
TokenSource = PreviousTokenSource;
ResetToken = Token;
Line.InPPDirective = false;
Line.Level = PreviousLineLevel;
}
FormatToken *getNextToken() override {
// The \c UnwrappedLineParser guards against this by never calling
// \c getNextToken() after it has encountered the first eof token.
assert(!eof());
PreviousToken = Token;
Token = PreviousTokenSource->getNextToken();
if (eof())
return getFakeEOF();
return Token;
}
unsigned getPosition() override { return PreviousTokenSource->getPosition(); }
FormatToken *setPosition(unsigned Position) override {
PreviousToken = nullptr;
Token = PreviousTokenSource->setPosition(Position);
return Token;
}
private:
bool eof() {
return Token && Token->HasUnescapedNewline &&
!continuesLineComment(*Token, PreviousToken,
/*MinColumnToken=*/PreviousToken);
}
FormatToken *getFakeEOF() {
static bool EOFInitialized = false;
static FormatToken FormatTok;
if (!EOFInitialized) {
FormatTok.Tok.startToken();
FormatTok.Tok.setKind(tok::eof);
EOFInitialized = true;
}
return &FormatTok;
}
UnwrappedLine &Line;
FormatTokenSource *&TokenSource;
FormatToken *&ResetToken;
unsigned PreviousLineLevel;
FormatTokenSource *PreviousTokenSource;
FormatToken *Token;
FormatToken *PreviousToken;
};
} // end anonymous namespace
class ScopedLineState {
public:
ScopedLineState(UnwrappedLineParser &Parser,
bool SwitchToPreprocessorLines = false)
: Parser(Parser), OriginalLines(Parser.CurrentLines) {
if (SwitchToPreprocessorLines)
Parser.CurrentLines = &Parser.PreprocessorDirectives;
else if (!Parser.Line->Tokens.empty())
Parser.CurrentLines = &Parser.Line->Tokens.back().Children;
PreBlockLine = std::move(Parser.Line);
Parser.Line = llvm::make_unique<UnwrappedLine>();
Parser.Line->Level = PreBlockLine->Level;
Parser.Line->InPPDirective = PreBlockLine->InPPDirective;
}
~ScopedLineState() {
if (!Parser.Line->Tokens.empty()) {
Parser.addUnwrappedLine();
}
assert(Parser.Line->Tokens.empty());
Parser.Line = std::move(PreBlockLine);
if (Parser.CurrentLines == &Parser.PreprocessorDirectives)
Parser.MustBreakBeforeNextToken = true;
Parser.CurrentLines = OriginalLines;
}
private:
UnwrappedLineParser &Parser;
std::unique_ptr<UnwrappedLine> PreBlockLine;
SmallVectorImpl<UnwrappedLine> *OriginalLines;
};
class CompoundStatementIndenter {
public:
CompoundStatementIndenter(UnwrappedLineParser *Parser,
const FormatStyle &Style, unsigned &LineLevel)
: LineLevel(LineLevel), OldLineLevel(LineLevel) {
if (Style.BraceWrapping.AfterControlStatement)
Parser->addUnwrappedLine();
if (Style.BraceWrapping.IndentBraces)
++LineLevel;
}
~CompoundStatementIndenter() { LineLevel = OldLineLevel; }
private:
unsigned &LineLevel;
unsigned OldLineLevel;
};
namespace {
class IndexedTokenSource : public FormatTokenSource {
public:
IndexedTokenSource(ArrayRef<FormatToken *> Tokens)
: Tokens(Tokens), Position(-1) {}
FormatToken *getNextToken() override {
++Position;
return Tokens[Position];
}
unsigned getPosition() override {
assert(Position >= 0);
return Position;
}
FormatToken *setPosition(unsigned P) override {
Position = P;
return Tokens[Position];
}
void reset() { Position = -1; }
private:
ArrayRef<FormatToken *> Tokens;
int Position;
};
} // end anonymous namespace
UnwrappedLineParser::UnwrappedLineParser(const FormatStyle &Style,
const AdditionalKeywords &Keywords,
unsigned FirstStartColumn,
ArrayRef<FormatToken *> Tokens,
UnwrappedLineConsumer &Callback)
: Line(new UnwrappedLine), MustBreakBeforeNextToken(false),
CurrentLines(&Lines), Style(Style), Keywords(Keywords),
CommentPragmasRegex(Style.CommentPragmas), Tokens(nullptr),
Callback(Callback), AllTokens(Tokens), PPBranchLevel(-1),
IfNdefCondition(nullptr), FoundIncludeGuardStart(false),
IncludeGuardRejected(false), FirstStartColumn(FirstStartColumn) {}
void UnwrappedLineParser::reset() {
PPBranchLevel = -1;
IfNdefCondition = nullptr;
FoundIncludeGuardStart = false;
IncludeGuardRejected = false;
Line.reset(new UnwrappedLine);
CommentsBeforeNextToken.clear();
FormatTok = nullptr;
MustBreakBeforeNextToken = false;
PreprocessorDirectives.clear();
CurrentLines = &Lines;
DeclarationScopeStack.clear();
PPStack.clear();
Line->FirstStartColumn = FirstStartColumn;
}
void UnwrappedLineParser::parse() {
IndexedTokenSource TokenSource(AllTokens);
Line->FirstStartColumn = FirstStartColumn;
do {
DEBUG(llvm::dbgs() << "----\n");
reset();
Tokens = &TokenSource;
TokenSource.reset();
readToken();
parseFile();
// Create line with eof token.
pushToken(FormatTok);
addUnwrappedLine();
for (SmallVectorImpl<UnwrappedLine>::iterator I = Lines.begin(),
E = Lines.end();
I != E; ++I) {
Callback.consumeUnwrappedLine(*I);
}
Callback.finishRun();
Lines.clear();
while (!PPLevelBranchIndex.empty() &&
PPLevelBranchIndex.back() + 1 >= PPLevelBranchCount.back()) {
PPLevelBranchIndex.resize(PPLevelBranchIndex.size() - 1);
PPLevelBranchCount.resize(PPLevelBranchCount.size() - 1);
}
if (!PPLevelBranchIndex.empty()) {
++PPLevelBranchIndex.back();
assert(PPLevelBranchIndex.size() == PPLevelBranchCount.size());
assert(PPLevelBranchIndex.back() <= PPLevelBranchCount.back());
}
} while (!PPLevelBranchIndex.empty());
}
void UnwrappedLineParser::parseFile() {
// The top-level context in a file always has declarations, except for pre-
// processor directives and JavaScript files.
bool MustBeDeclaration =
!Line->InPPDirective && Style.Language != FormatStyle::LK_JavaScript;
ScopedDeclarationState DeclarationState(*Line, DeclarationScopeStack,
MustBeDeclaration);
if (Style.Language == FormatStyle::LK_TextProto)
parseBracedList();
else
parseLevel(/*HasOpeningBrace=*/false);
// Make sure to format the remaining tokens.
flushComments(true);
addUnwrappedLine();
}
void UnwrappedLineParser::parseLevel(bool HasOpeningBrace) {
bool SwitchLabelEncountered = false;
do {
tok::TokenKind kind = FormatTok->Tok.getKind();
if (FormatTok->Type == TT_MacroBlockBegin) {
kind = tok::l_brace;
} else if (FormatTok->Type == TT_MacroBlockEnd) {
kind = tok::r_brace;
}
switch (kind) {
case tok::comment:
nextToken();
addUnwrappedLine();
break;
case tok::l_brace:
// FIXME: Add parameter whether this can happen - if this happens, we must
// be in a non-declaration context.
if (!FormatTok->is(TT_MacroBlockBegin) && tryToParseBracedList())
continue;
parseBlock(/*MustBeDeclaration=*/false);
addUnwrappedLine();
break;
case tok::r_brace:
if (HasOpeningBrace)
return;
nextToken();
addUnwrappedLine();
break;
case tok::kw_default:
case tok::kw_case:
if (Style.Language == FormatStyle::LK_JavaScript &&
Line->MustBeDeclaration) {
// A 'case: string' style field declaration.
parseStructuralElement();
break;
}
if (!SwitchLabelEncountered &&
(Style.IndentCaseLabels || (Line->InPPDirective && Line->Level == 1)))
++Line->Level;
SwitchLabelEncountered = true;
parseStructuralElement();
break;
default:
parseStructuralElement();
break;
}
} while (!eof());
}
void UnwrappedLineParser::calculateBraceTypes(bool ExpectClassBody) {
// We'll parse forward through the tokens until we hit
// a closing brace or eof - note that getNextToken() will
// parse macros, so this will magically work inside macro
// definitions, too.
unsigned StoredPosition = Tokens->getPosition();
FormatToken *Tok = FormatTok;
const FormatToken *PrevTok = Tok->Previous;
// Keep a stack of positions of lbrace tokens. We will
// update information about whether an lbrace starts a
// braced init list or a different block during the loop.
SmallVector<FormatToken *, 8> LBraceStack;
assert(Tok->Tok.is(tok::l_brace));
do {
// Get next non-comment token.
FormatToken *NextTok;
unsigned ReadTokens = 0;
do {
NextTok = Tokens->getNextToken();
++ReadTokens;
} while (NextTok->is(tok::comment));
switch (Tok->Tok.getKind()) {
case tok::l_brace:
if (Style.Language == FormatStyle::LK_JavaScript && PrevTok) {
if (PrevTok->isOneOf(tok::colon, tok::less))
// A ':' indicates this code is in a type, or a braced list
// following a label in an object literal ({a: {b: 1}}).
// A '<' could be an object used in a comparison, but that is nonsense
// code (can never return true), so more likely it is a generic type
// argument (`X<{a: string; b: number}>`).
// The code below could be confused by semicolons between the
// individual members in a type member list, which would normally
// trigger BK_Block. In both cases, this must be parsed as an inline
// braced init.
Tok->BlockKind = BK_BracedInit;
else if (PrevTok->is(tok::r_paren))
// `) { }` can only occur in function or method declarations in JS.
Tok->BlockKind = BK_Block;
} else {
Tok->BlockKind = BK_Unknown;
}
LBraceStack.push_back(Tok);
break;
case tok::r_brace:
if (LBraceStack.empty())
break;
if (LBraceStack.back()->BlockKind == BK_Unknown) {
bool ProbablyBracedList = false;
if (Style.Language == FormatStyle::LK_Proto) {
ProbablyBracedList = NextTok->isOneOf(tok::comma, tok::r_square);
} else {
// Using OriginalColumn to distinguish between ObjC methods and
// binary operators is a bit hacky.
bool NextIsObjCMethod = NextTok->isOneOf(tok::plus, tok::minus) &&
NextTok->OriginalColumn == 0;
// If there is a comma, semicolon or right paren after the closing
// brace, we assume this is a braced initializer list. Note that
// regardless how we mark inner braces here, we will overwrite the
// BlockKind later if we parse a braced list (where all blocks
// inside are by default braced lists), or when we explicitly detect
// blocks (for example while parsing lambdas).
// FIXME: Some of these do not apply to JS, e.g. "} {" can never be a
// braced list in JS.
ProbablyBracedList =
(Style.Language == FormatStyle::LK_JavaScript &&
NextTok->isOneOf(Keywords.kw_of, Keywords.kw_in,
Keywords.kw_as)) ||
(Style.isCpp() && NextTok->is(tok::l_paren)) ||
NextTok->isOneOf(tok::comma, tok::period, tok::colon,
tok::r_paren, tok::r_square, tok::l_brace,
tok::l_square, tok::ellipsis) ||
(NextTok->is(tok::identifier) &&
!PrevTok->isOneOf(tok::semi, tok::r_brace, tok::l_brace)) ||
(NextTok->is(tok::semi) &&
(!ExpectClassBody || LBraceStack.size() != 1)) ||
(NextTok->isBinaryOperator() && !NextIsObjCMethod);
}
if (ProbablyBracedList) {
Tok->BlockKind = BK_BracedInit;
LBraceStack.back()->BlockKind = BK_BracedInit;
} else {
Tok->BlockKind = BK_Block;
LBraceStack.back()->BlockKind = BK_Block;
}
}
LBraceStack.pop_back();
break;
case tok::at:
case tok::semi:
case tok::kw_if:
case tok::kw_while:
case tok::kw_for:
case tok::kw_switch:
case tok::kw_try:
case tok::kw___try:
if (!LBraceStack.empty() && LBraceStack.back()->BlockKind == BK_Unknown)
LBraceStack.back()->BlockKind = BK_Block;
break;
default:
break;
}
PrevTok = Tok;
Tok = NextTok;
} while (Tok->Tok.isNot(tok::eof) && !LBraceStack.empty());
// Assume other blocks for all unclosed opening braces.
for (unsigned i = 0, e = LBraceStack.size(); i != e; ++i) {
if (LBraceStack[i]->BlockKind == BK_Unknown)
LBraceStack[i]->BlockKind = BK_Block;
}
FormatTok = Tokens->setPosition(StoredPosition);
}
template <class T>
static inline void hash_combine(std::size_t &seed, const T &v) {
std::hash<T> hasher;
seed ^= hasher(v) + 0x9e3779b9 + (seed << 6) + (seed >> 2);
}
size_t UnwrappedLineParser::computePPHash() const {
size_t h = 0;
for (const auto &i : PPStack) {
hash_combine(h, size_t(i.Kind));
hash_combine(h, i.Line);
}
return h;
}
void UnwrappedLineParser::parseBlock(bool MustBeDeclaration, bool AddLevel,
bool MunchSemi) {
assert(FormatTok->isOneOf(tok::l_brace, TT_MacroBlockBegin) &&
"'{' or macro block token expected");
const bool MacroBlock = FormatTok->is(TT_MacroBlockBegin);
FormatTok->BlockKind = BK_Block;
size_t PPStartHash = computePPHash();
unsigned InitialLevel = Line->Level;
nextToken(/*LevelDifference=*/AddLevel ? 1 : 0);
if (MacroBlock && FormatTok->is(tok::l_paren))
parseParens();
size_t NbPreprocessorDirectives =
CurrentLines == &Lines ? PreprocessorDirectives.size() : 0;
addUnwrappedLine();
size_t OpeningLineIndex =
CurrentLines->empty()
? (UnwrappedLine::kInvalidIndex)
: (CurrentLines->size() - 1 - NbPreprocessorDirectives);
ScopedDeclarationState DeclarationState(*Line, DeclarationScopeStack,
MustBeDeclaration);
if (AddLevel)
++Line->Level;
parseLevel(/*HasOpeningBrace=*/true);
if (eof())
return;
if (MacroBlock ? !FormatTok->is(TT_MacroBlockEnd)
: !FormatTok->is(tok::r_brace)) {
Line->Level = InitialLevel;
FormatTok->BlockKind = BK_Block;
return;
}
size_t PPEndHash = computePPHash();
// Munch the closing brace.
nextToken(/*LevelDifference=*/AddLevel ? -1 : 0);
if (MacroBlock && FormatTok->is(tok::l_paren))
parseParens();
if (MunchSemi && FormatTok->Tok.is(tok::semi))
nextToken();
Line->Level = InitialLevel;
if (PPStartHash == PPEndHash) {
Line->MatchingOpeningBlockLineIndex = OpeningLineIndex;
if (OpeningLineIndex != UnwrappedLine::kInvalidIndex) {
// Update the opening line to add the forward reference as well
(*CurrentLines)[OpeningLineIndex].MatchingOpeningBlockLineIndex =
CurrentLines->size() - 1;
}
}
}
static bool isGoogScope(const UnwrappedLine &Line) {
// FIXME: Closure-library specific stuff should not be hard-coded but be
// configurable.
if (Line.Tokens.size() < 4)
return false;
auto I = Line.Tokens.begin();
if (I->Tok->TokenText != "goog")
return false;
++I;
if (I->Tok->isNot(tok::period))
return false;
++I;
if (I->Tok->TokenText != "scope")
return false;
++I;
return I->Tok->is(tok::l_paren);
}
static bool isIIFE(const UnwrappedLine &Line,
const AdditionalKeywords &Keywords) {
// Look for the start of an immediately invoked anonymous function.
// https://en.wikipedia.org/wiki/Immediately-invoked_function_expression
// This is commonly done in JavaScript to create a new, anonymous scope.
// Example: (function() { ... })()
if (Line.Tokens.size() < 3)
return false;
auto I = Line.Tokens.begin();
if (I->Tok->isNot(tok::l_paren))
return false;
++I;
if (I->Tok->isNot(Keywords.kw_function))
return false;
++I;
return I->Tok->is(tok::l_paren);
}
static bool ShouldBreakBeforeBrace(const FormatStyle &Style,
const FormatToken &InitialToken) {
if (InitialToken.is(tok::kw_namespace))
return Style.BraceWrapping.AfterNamespace;
if (InitialToken.is(tok::kw_class))
return Style.BraceWrapping.AfterClass;
if (InitialToken.is(tok::kw_union))
return Style.BraceWrapping.AfterUnion;
if (InitialToken.is(tok::kw_struct))
return Style.BraceWrapping.AfterStruct;
return false;
}
void UnwrappedLineParser::parseChildBlock() {
FormatTok->BlockKind = BK_Block;
nextToken();
{
bool SkipIndent = (Style.Language == FormatStyle::LK_JavaScript &&
(isGoogScope(*Line) || isIIFE(*Line, Keywords)));
ScopedLineState LineState(*this);
ScopedDeclarationState DeclarationState(*Line, DeclarationScopeStack,
/*MustBeDeclaration=*/false);
Line->Level += SkipIndent ? 0 : 1;
parseLevel(/*HasOpeningBrace=*/true);
flushComments(isOnNewLine(*FormatTok));
Line->Level -= SkipIndent ? 0 : 1;
}
nextToken();
}
void UnwrappedLineParser::parsePPDirective() {
assert(FormatTok->Tok.is(tok::hash) && "'#' expected");
ScopedMacroState MacroState(*Line, Tokens, FormatTok);
nextToken();
if (!FormatTok->Tok.getIdentifierInfo()) {
parsePPUnknown();
return;
}
switch (FormatTok->Tok.getIdentifierInfo()->getPPKeywordID()) {
case tok::pp_define:
parsePPDefine();
return;
case tok::pp_if:
parsePPIf(/*IfDef=*/false);
break;
case tok::pp_ifdef:
case tok::pp_ifndef:
parsePPIf(/*IfDef=*/true);
break;
case tok::pp_else:
parsePPElse();
break;
case tok::pp_elif:
parsePPElIf();
break;
case tok::pp_endif:
parsePPEndIf();
break;
default:
parsePPUnknown();
break;
}
}
void UnwrappedLineParser::conditionalCompilationCondition(bool Unreachable) {
size_t Line = CurrentLines->size();
if (CurrentLines == &PreprocessorDirectives)
Line += Lines.size();
if (Unreachable ||
(!PPStack.empty() && PPStack.back().Kind == PP_Unreachable))
PPStack.push_back({PP_Unreachable, Line});
else
PPStack.push_back({PP_Conditional, Line});
}
void UnwrappedLineParser::conditionalCompilationStart(bool Unreachable) {
++PPBranchLevel;
assert(PPBranchLevel >= 0 && PPBranchLevel <= (int)PPLevelBranchIndex.size());
if (PPBranchLevel == (int)PPLevelBranchIndex.size()) {
PPLevelBranchIndex.push_back(0);
PPLevelBranchCount.push_back(0);
}
PPChainBranchIndex.push(0);
bool Skip = PPLevelBranchIndex[PPBranchLevel] > 0;
conditionalCompilationCondition(Unreachable || Skip);
}
void UnwrappedLineParser::conditionalCompilationAlternative() {
if (!PPStack.empty())
PPStack.pop_back();
assert(PPBranchLevel < (int)PPLevelBranchIndex.size());
if (!PPChainBranchIndex.empty())
++PPChainBranchIndex.top();
conditionalCompilationCondition(
PPBranchLevel >= 0 && !PPChainBranchIndex.empty() &&
PPLevelBranchIndex[PPBranchLevel] != PPChainBranchIndex.top());
}
void UnwrappedLineParser::conditionalCompilationEnd() {
assert(PPBranchLevel < (int)PPLevelBranchIndex.size());
if (PPBranchLevel >= 0 && !PPChainBranchIndex.empty()) {
if (PPChainBranchIndex.top() + 1 > PPLevelBranchCount[PPBranchLevel]) {
PPLevelBranchCount[PPBranchLevel] = PPChainBranchIndex.top() + 1;
}
}
// Guard against #endif's without #if.
if (PPBranchLevel > -1)
--PPBranchLevel;
if (!PPChainBranchIndex.empty())
PPChainBranchIndex.pop();
if (!PPStack.empty())
PPStack.pop_back();
}
void UnwrappedLineParser::parsePPIf(bool IfDef) {
bool IfNDef = FormatTok->is(tok::pp_ifndef);
nextToken();
bool Unreachable = false;
if (!IfDef && (FormatTok->is(tok::kw_false) || FormatTok->TokenText == "0"))
Unreachable = true;
if (IfDef && !IfNDef && FormatTok->TokenText == "SWIG")
Unreachable = true;
conditionalCompilationStart(Unreachable);
FormatToken *IfCondition = FormatTok;
// If there's a #ifndef on the first line, and the only lines before it are
// comments, it could be an include guard.
bool MaybeIncludeGuard = IfNDef;
if (!IncludeGuardRejected && !FoundIncludeGuardStart && MaybeIncludeGuard) {
for (auto &Line : Lines) {
if (!Line.Tokens.front().Tok->is(tok::comment)) {
MaybeIncludeGuard = false;
IncludeGuardRejected = true;
break;
}
}
}
--PPBranchLevel;
parsePPUnknown();
++PPBranchLevel;
if (!IncludeGuardRejected && !FoundIncludeGuardStart && MaybeIncludeGuard)
IfNdefCondition = IfCondition;
}
void UnwrappedLineParser::parsePPElse() {
// If a potential include guard has an #else, it's not an include guard.
if (FoundIncludeGuardStart && PPBranchLevel == 0)
FoundIncludeGuardStart = false;
conditionalCompilationAlternative();
if (PPBranchLevel > -1)
--PPBranchLevel;
parsePPUnknown();
++PPBranchLevel;
}
void UnwrappedLineParser::parsePPElIf() { parsePPElse(); }
void UnwrappedLineParser::parsePPEndIf() {
conditionalCompilationEnd();
parsePPUnknown();
// If the #endif of a potential include guard is the last thing in the file,
// then we count it as a real include guard and subtract one from every
// preprocessor indent.
unsigned TokenPosition = Tokens->getPosition();
FormatToken *PeekNext = AllTokens[TokenPosition];
if (FoundIncludeGuardStart && PPBranchLevel == -1 && PeekNext->is(tok::eof) &&
Style.IndentPPDirectives != FormatStyle::PPDIS_None)
for (auto &Line : Lines)
if (Line.InPPDirective && Line.Level > 0)
--Line.Level;
}
void UnwrappedLineParser::parsePPDefine() {
nextToken();
if (FormatTok->Tok.getKind() != tok::identifier) {
parsePPUnknown();
return;
}
if (IfNdefCondition && IfNdefCondition->TokenText == FormatTok->TokenText) {
FoundIncludeGuardStart = true;
for (auto &Line : Lines) {
if (!Line.Tokens.front().Tok->isOneOf(tok::comment, tok::hash)) {
FoundIncludeGuardStart = false;
break;
}
}
}
IfNdefCondition = nullptr;
nextToken();
if (FormatTok->Tok.getKind() == tok::l_paren &&
FormatTok->WhitespaceRange.getBegin() ==
FormatTok->WhitespaceRange.getEnd()) {
parseParens();
}
if (Style.IndentPPDirectives == FormatStyle::PPDIS_AfterHash)
Line->Level += PPBranchLevel + 1;
addUnwrappedLine();
++Line->Level;
// Errors during a preprocessor directive can only affect the layout of the
// preprocessor directive, and thus we ignore them. An alternative approach
// would be to use the same approach we use on the file level (no
// re-indentation if there was a structural error) within the macro
// definition.
parseFile();
}
void UnwrappedLineParser::parsePPUnknown() {
do {
nextToken();
} while (!eof());
if (Style.IndentPPDirectives == FormatStyle::PPDIS_AfterHash)
Line->Level += PPBranchLevel + 1;
addUnwrappedLine();
IfNdefCondition = nullptr;
}
// Here we blacklist certain tokens that are not usually the first token in an
// unwrapped line. This is used in attempt to distinguish macro calls without
// trailing semicolons from other constructs split to several lines.
static bool tokenCanStartNewLine(const clang::Token &Tok) {
// Semicolon can be a null-statement, l_square can be a start of a macro or
// a C++11 attribute, but this doesn't seem to be common.
return Tok.isNot(tok::semi) && Tok.isNot(tok::l_brace) &&
Tok.isNot(tok::l_square) &&
// Tokens that can only be used as binary operators and a part of
// overloaded operator names.
Tok.isNot(tok::period) && Tok.isNot(tok::periodstar) &&
Tok.isNot(tok::arrow) && Tok.isNot(tok::arrowstar) &&
Tok.isNot(tok::less) && Tok.isNot(tok::greater) &&
Tok.isNot(tok::slash) && Tok.isNot(tok::percent) &&
Tok.isNot(tok::lessless) && Tok.isNot(tok::greatergreater) &&
Tok.isNot(tok::equal) && Tok.isNot(tok::plusequal) &&
Tok.isNot(tok::minusequal) && Tok.isNot(tok::starequal) &&
Tok.isNot(tok::slashequal) && Tok.isNot(tok::percentequal) &&
Tok.isNot(tok::ampequal) && Tok.isNot(tok::pipeequal) &&
Tok.isNot(tok::caretequal) && Tok.isNot(tok::greatergreaterequal) &&
Tok.isNot(tok::lesslessequal) &&
// Colon is used in labels, base class lists, initializer lists,
// range-based for loops, ternary operator, but should never be the
// first token in an unwrapped line.
Tok.isNot(tok::colon) &&
// 'noexcept' is a trailing annotation.
Tok.isNot(tok::kw_noexcept);
}
static bool mustBeJSIdent(const AdditionalKeywords &Keywords,
const FormatToken *FormatTok) {
// FIXME: This returns true for C/C++ keywords like 'struct'.
return FormatTok->is(tok::identifier) &&
(FormatTok->Tok.getIdentifierInfo() == nullptr ||
!FormatTok->isOneOf(
Keywords.kw_in, Keywords.kw_of, Keywords.kw_as, Keywords.kw_async,
Keywords.kw_await, Keywords.kw_yield, Keywords.kw_finally,
Keywords.kw_function, Keywords.kw_import, Keywords.kw_is,
Keywords.kw_let, Keywords.kw_var, tok::kw_const,
Keywords.kw_abstract, Keywords.kw_extends, Keywords.kw_implements,
Keywords.kw_instanceof, Keywords.kw_interface, Keywords.kw_throws,
Keywords.kw_from));
}
static bool mustBeJSIdentOrValue(const AdditionalKeywords &Keywords,
const FormatToken *FormatTok) {
return FormatTok->Tok.isLiteral() ||
FormatTok->isOneOf(tok::kw_true, tok::kw_false) ||
mustBeJSIdent(Keywords, FormatTok);
}
// isJSDeclOrStmt returns true if |FormatTok| starts a declaration or statement
// when encountered after a value (see mustBeJSIdentOrValue).
static bool isJSDeclOrStmt(const AdditionalKeywords &Keywords,
const FormatToken *FormatTok) {
return FormatTok->isOneOf(
tok::kw_return, Keywords.kw_yield,
// conditionals
tok::kw_if, tok::kw_else,
// loops
tok::kw_for, tok::kw_while, tok::kw_do, tok::kw_continue, tok::kw_break,
// switch/case
tok::kw_switch, tok::kw_case,
// exceptions
tok::kw_throw, tok::kw_try, tok::kw_catch, Keywords.kw_finally,
// declaration
tok::kw_const, tok::kw_class, Keywords.kw_var, Keywords.kw_let,
Keywords.kw_async, Keywords.kw_function,
// import/export
Keywords.kw_import, tok::kw_export);
}
// readTokenWithJavaScriptASI reads the next token and terminates the current
// line if JavaScript Automatic Semicolon Insertion must
// happen between the current token and the next token.
//
// This method is conservative - it cannot cover all edge cases of JavaScript,
// but only aims to correctly handle certain well known cases. It *must not*
// return true in speculative cases.
void UnwrappedLineParser::readTokenWithJavaScriptASI() {
FormatToken *Previous = FormatTok;
readToken();
FormatToken *Next = FormatTok;
bool IsOnSameLine =
CommentsBeforeNextToken.empty()
? Next->NewlinesBefore == 0
: CommentsBeforeNextToken.front()->NewlinesBefore == 0;
if (IsOnSameLine)
return;
bool PreviousMustBeValue = mustBeJSIdentOrValue(Keywords, Previous);
bool PreviousStartsTemplateExpr =
Previous->is(TT_TemplateString) && Previous->TokenText.endswith("${");
if (PreviousMustBeValue || Previous->is(tok::r_paren)) {
// If the line contains an '@' sign, the previous token might be an
// annotation, which can precede another identifier/value.
bool HasAt = std::find_if(Line->Tokens.begin(), Line->Tokens.end(),
[](UnwrappedLineNode &LineNode) {
return LineNode.Tok->is(tok::at);
}) != Line->Tokens.end();
if (HasAt)
return;
}
if (Next->is(tok::exclaim) && PreviousMustBeValue)
return addUnwrappedLine();
bool NextMustBeValue = mustBeJSIdentOrValue(Keywords, Next);
bool NextEndsTemplateExpr =
Next->is(TT_TemplateString) && Next->TokenText.startswith("}");
if (NextMustBeValue && !NextEndsTemplateExpr && !PreviousStartsTemplateExpr &&
(PreviousMustBeValue ||
Previous->isOneOf(tok::r_square, tok::r_paren, tok::plusplus,
tok::minusminus)))
return addUnwrappedLine();
if ((PreviousMustBeValue || Previous->is(tok::r_paren)) &&
isJSDeclOrStmt(Keywords, Next))
return addUnwrappedLine();
}
void UnwrappedLineParser::parseStructuralElement() {
assert(!FormatTok->is(tok::l_brace));
if (Style.Language == FormatStyle::LK_TableGen &&
FormatTok->is(tok::pp_include)) {
nextToken();
if (FormatTok->is(tok::string_literal))
nextToken();
addUnwrappedLine();
return;
}
switch (FormatTok->Tok.getKind()) {
case tok::at:
nextToken();
if (FormatTok->Tok.is(tok::l_brace)) {
nextToken();
parseBracedList();
break;
}
switch (FormatTok->Tok.getObjCKeywordID()) {
case tok::objc_public:
case tok::objc_protected:
case tok::objc_package:
case tok::objc_private:
return parseAccessSpecifier();
case tok::objc_interface:
case tok::objc_implementation:
return parseObjCInterfaceOrImplementation();
case tok::objc_protocol:
return parseObjCProtocol();
case tok::objc_end:
return; // Handled by the caller.
case tok::objc_optional:
case tok::objc_required:
nextToken();
addUnwrappedLine();
return;
case tok::objc_autoreleasepool:
nextToken();
if (FormatTok->Tok.is(tok::l_brace)) {
if (Style.BraceWrapping.AfterObjCDeclaration)
addUnwrappedLine();
parseBlock(/*MustBeDeclaration=*/false);
}
addUnwrappedLine();
return;
case tok::objc_try:
// This branch isn't strictly necessary (the kw_try case below would
// do this too after the tok::at is parsed above). But be explicit.
parseTryCatch();
return;
default:
break;
}
break;
case tok::kw_asm:
nextToken();
if (FormatTok->is(tok::l_brace)) {
FormatTok->Type = TT_InlineASMBrace;
nextToken();
while (FormatTok && FormatTok->isNot(tok::eof)) {
if (FormatTok->is(tok::r_brace)) {
FormatTok->Type = TT_InlineASMBrace;
nextToken();
addUnwrappedLine();
break;
}
FormatTok->Finalized = true;
nextToken();
}
}
break;
case tok::kw_namespace:
parseNamespace();
return;
case tok::kw_inline:
nextToken();
if (FormatTok->Tok.is(tok::kw_namespace)) {