ContinuationIndenter.cpp [plain text]
#define DEBUG_TYPE "format-formatter"
#include "BreakableToken.h"
#include "ContinuationIndenter.h"
#include "WhitespaceManager.h"
#include "clang/Basic/OperatorPrecedence.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Format/Format.h"
#include "llvm/Support/Debug.h"
#include <string>
namespace clang {
namespace format {
static unsigned getLengthToMatchingParen(const FormatToken &Tok) {
if (Tok.MatchingParen == NULL)
return 0;
FormatToken *End = Tok.MatchingParen;
while (End->Next && !End->Next->CanBreakBefore) {
End = End->Next;
}
return End->TotalLength - Tok.TotalLength + 1;
}
static bool startsSegmentOfBuilderTypeCall(const FormatToken &Tok) {
return Tok.isMemberAccess() && Tok.Previous && Tok.Previous->closesScope();
}
static bool startsNextParameter(const FormatToken &Current,
const FormatStyle &Style) {
const FormatToken &Previous = *Current.Previous;
if (Current.Type == TT_CtorInitializerComma &&
Style.BreakConstructorInitializersBeforeComma)
return true;
return Previous.is(tok::comma) && !Current.isTrailingComment() &&
(Previous.Type != TT_CtorInitializerComma ||
!Style.BreakConstructorInitializersBeforeComma);
}
ContinuationIndenter::ContinuationIndenter(const FormatStyle &Style,
SourceManager &SourceMgr,
WhitespaceManager &Whitespaces,
encoding::Encoding Encoding,
bool BinPackInconclusiveFunctions)
: Style(Style), SourceMgr(SourceMgr), Whitespaces(Whitespaces),
Encoding(Encoding),
BinPackInconclusiveFunctions(BinPackInconclusiveFunctions) {}
LineState ContinuationIndenter::getInitialState(unsigned FirstIndent,
const AnnotatedLine *Line,
bool DryRun) {
LineState State;
State.FirstIndent = FirstIndent;
State.Column = FirstIndent;
State.Line = Line;
State.NextToken = Line->First;
State.Stack.push_back(ParenState(FirstIndent, Line->Level, FirstIndent,
false,
false));
State.LineContainsContinuedForLoopSection = false;
State.ParenLevel = 0;
State.StartOfStringLiteral = 0;
State.StartOfLineLevel = State.ParenLevel;
State.LowestLevelOnLine = State.ParenLevel;
State.IgnoreStackForComparison = false;
moveStateToNextToken(State, DryRun, false);
return State;
}
bool ContinuationIndenter::canBreak(const LineState &State) {
const FormatToken &Current = *State.NextToken;
const FormatToken &Previous = *Current.Previous;
assert(&Previous == Current.Previous);
if (!Current.CanBreakBefore && !(State.Stack.back().BreakBeforeClosingBrace &&
Current.closesBlockTypeList(Style)))
return false;
if (!Current.MustBreakBefore && Previous.is(tok::l_brace) &&
Previous.Type != TT_DictLiteral &&
Previous.BlockKind == BK_BracedInit && Previous.Previous &&
Previous.Previous->isOneOf(tok::l_brace, tok::l_paren, tok::comma))
return false;
if (Previous.opensScope() && State.LowestLevelOnLine < State.StartOfLineLevel)
return false;
if (Current.isMemberAccess() && State.Stack.back().ContainsUnwrappedBuilder)
return false;
return !State.Stack.back().NoLineBreak;
}
bool ContinuationIndenter::mustBreak(const LineState &State) {
const FormatToken &Current = *State.NextToken;
const FormatToken &Previous = *Current.Previous;
if (Current.MustBreakBefore || Current.Type == TT_InlineASMColon)
return true;
if (State.Stack.back().BreakBeforeClosingBrace &&
Current.closesBlockTypeList(Style))
return true;
if (Previous.is(tok::semi) && State.LineContainsContinuedForLoopSection)
return true;
if ((startsNextParameter(Current, Style) || Previous.is(tok::semi) ||
(Style.BreakBeforeTernaryOperators &&
(Current.is(tok::question) || (Current.Type == TT_ConditionalExpr &&
Previous.isNot(tok::question)))) ||
(!Style.BreakBeforeTernaryOperators &&
(Previous.is(tok::question) || Previous.Type == TT_ConditionalExpr))) &&
State.Stack.back().BreakBeforeParameter && !Current.isTrailingComment() &&
!Current.isOneOf(tok::r_paren, tok::r_brace))
return true;
if (Style.AlwaysBreakBeforeMultilineStrings &&
State.Column > State.Stack.back().Indent && !Previous.isOneOf(tok::kw_return, tok::lessless) &&
Previous.Type != TT_InlineASMColon && NextIsMultilineString(State))
return true;
if (((Previous.Type == TT_DictLiteral && Previous.is(tok::l_brace)) ||
Previous.Type == TT_ArrayInitializerLSquare) &&
getLengthToMatchingParen(Previous) + State.Column > getColumnLimit(State))
return true;
if (!Style.BreakBeforeBinaryOperators) {
bool IsComparison = (Previous.getPrecedence() == prec::Relational ||
Previous.getPrecedence() == prec::Equality) &&
Previous.Previous &&
Previous.Previous->Type != TT_BinaryOperator; bool LHSIsBinaryExpr =
Previous.Previous && Previous.Previous->EndsBinaryExpression;
if (Previous.Type == TT_BinaryOperator &&
(!IsComparison || LHSIsBinaryExpr) &&
Current.Type != TT_BinaryOperator && !Current.isTrailingComment() &&
!Previous.isOneOf(tok::lessless, tok::question) &&
Previous.getPrecedence() != prec::Assignment &&
State.Stack.back().BreakBeforeParameter)
return true;
}
if (Current.is(tok::lessless) && State.Stack.back().BreakBeforeParameter &&
State.Stack.back().FirstLessLess == 0)
return true;
if (Current.Type == TT_ObjCSelectorName &&
Current.LongestObjCSelectorName == 0 &&
State.Stack.back().BreakBeforeParameter)
return true;
if ((Current.Type == TT_CtorInitializerColon ||
(Previous.ClosesTemplateDeclaration && State.ParenLevel == 0 &&
!Current.isTrailingComment())))
return true;
if ((Current.Type == TT_StartOfName || Current.is(tok::kw_operator)) &&
State.Line->MightBeFunctionDecl &&
State.Stack.back().BreakBeforeParameter && State.ParenLevel == 0)
return true;
if (startsSegmentOfBuilderTypeCall(Current) &&
(State.Stack.back().CallContinuation != 0 ||
(State.Stack.back().BreakBeforeParameter &&
State.Stack.back().ContainsUnwrappedBuilder)))
return true;
return false;
}
unsigned ContinuationIndenter::addTokenToState(LineState &State, bool Newline,
bool DryRun,
unsigned ExtraSpaces) {
const FormatToken &Current = *State.NextToken;
if (State.Stack.size() == 0 ||
(Current.Type == TT_ImplicitStringLiteral &&
(Current.Previous->Tok.getIdentifierInfo() == NULL ||
Current.Previous->Tok.getIdentifierInfo()->getPPKeywordID() ==
tok::pp_not_keyword))) {
int WhitespaceLength = SourceMgr.getSpellingColumnNumber(
State.NextToken->WhitespaceRange.getEnd()) -
SourceMgr.getSpellingColumnNumber(
State.NextToken->WhitespaceRange.getBegin());
State.Column += WhitespaceLength + State.NextToken->ColumnWidth;
State.NextToken = State.NextToken->Next;
return 0;
}
unsigned Penalty = 0;
if (Newline)
Penalty = addTokenOnNewLine(State, DryRun);
else
addTokenOnCurrentLine(State, DryRun, ExtraSpaces);
return moveStateToNextToken(State, DryRun, Newline) + Penalty;
}
void ContinuationIndenter::addTokenOnCurrentLine(LineState &State, bool DryRun,
unsigned ExtraSpaces) {
FormatToken &Current = *State.NextToken;
const FormatToken &Previous = *State.NextToken->Previous;
if (Current.is(tok::equal) &&
(State.Line->First->is(tok::kw_for) || State.ParenLevel == 0) &&
State.Stack.back().VariablePos == 0) {
State.Stack.back().VariablePos = State.Column;
const FormatToken *Tok = &Previous;
while (Tok && State.Stack.back().VariablePos >= Tok->ColumnWidth) {
State.Stack.back().VariablePos -= Tok->ColumnWidth;
if (Tok->SpacesRequiredBefore != 0)
break;
Tok = Tok->Previous;
}
if (Previous.PartOfMultiVariableDeclStmt)
State.Stack.back().LastSpace = State.Stack.back().VariablePos;
}
unsigned Spaces = Current.SpacesRequiredBefore + ExtraSpaces;
if (!DryRun)
Whitespaces.replaceWhitespace(Current, 0, 0,
Spaces, State.Column + Spaces);
if (Current.Type == TT_ObjCSelectorName && State.Stack.back().ColonPos == 0) {
if (State.Stack.back().Indent + Current.LongestObjCSelectorName >
State.Column + Spaces + Current.ColumnWidth)
State.Stack.back().ColonPos =
State.Stack.back().Indent + Current.LongestObjCSelectorName;
else
State.Stack.back().ColonPos = State.Column + Spaces + Current.ColumnWidth;
}
if (Previous.opensScope() && Previous.Type != TT_ObjCMethodExpr &&
Current.Type != TT_LineComment)
State.Stack.back().Indent = State.Column + Spaces;
if (State.Stack.back().AvoidBinPacking && startsNextParameter(Current, Style))
State.Stack.back().NoLineBreak = true;
if (startsSegmentOfBuilderTypeCall(Current))
State.Stack.back().ContainsUnwrappedBuilder = true;
State.Column += Spaces;
if (Current.is(tok::l_paren) && Previous.isOneOf(tok::kw_if, tok::kw_for))
State.Stack.back().LastSpace = State.Column + 1; else if (Previous.is(tok::comma) || Previous.Type == TT_ObjCMethodExpr)
State.Stack.back().LastSpace = State.Column;
else if ((Previous.Type == TT_BinaryOperator ||
Previous.Type == TT_ConditionalExpr ||
Previous.Type == TT_UnaryOperator ||
Previous.Type == TT_CtorInitializerColon) &&
(Previous.getPrecedence() != prec::Assignment ||
Current.StartsBinaryExpression))
State.Stack.back().LastSpace = State.Column;
else if (Previous.Type == TT_InheritanceColon) {
State.Stack.back().Indent = State.Column;
State.Stack.back().LastSpace = State.Column;
} else if (Previous.opensScope()) {
bool HasTrailingCall = false;
if (Previous.MatchingParen) {
const FormatToken *Next = Previous.MatchingParen->getNextNonComment();
HasTrailingCall = Next && Next->isMemberAccess();
}
if (HasTrailingCall &&
State.Stack[State.Stack.size() - 2].CallContinuation == 0)
State.Stack.back().LastSpace = State.Column;
}
}
unsigned ContinuationIndenter::addTokenOnNewLine(LineState &State,
bool DryRun) {
FormatToken &Current = *State.NextToken;
const FormatToken &Previous = *State.NextToken->Previous;
unsigned ContinuationIndent =
std::max(State.Stack.back().LastSpace, State.Stack.back().Indent) +
Style.ContinuationIndentWidth;
unsigned Penalty = 0;
const FormatToken *PreviousNonComment =
State.NextToken->getPreviousNonComment();
if (!State.Stack.back().ContainsLineBreak)
Penalty += 15;
State.Stack.back().ContainsLineBreak = true;
Penalty += State.NextToken->SplitPenalty;
if (Current.is(tok::lessless) && State.Stack.back().FirstLessLess == 0 &&
State.Column <= Style.ColumnLimit / 2)
Penalty += Style.PenaltyBreakFirstLessLess;
if (Current.is(tok::l_brace) && Current.BlockKind == BK_Block) {
State.Column = State.FirstIndent;
} else if (Current.isOneOf(tok::r_brace, tok::r_square)) {
if (Current.closesBlockTypeList(Style) ||
(Current.MatchingParen &&
Current.MatchingParen->BlockKind == BK_BracedInit))
State.Column = State.Stack[State.Stack.size() - 2].LastSpace;
else
State.Column = State.FirstIndent;
} else if (Current.is(tok::string_literal) &&
State.StartOfStringLiteral != 0) {
State.Column = State.StartOfStringLiteral;
State.Stack.back().BreakBeforeParameter = true;
} else if (Current.is(tok::lessless) &&
State.Stack.back().FirstLessLess != 0) {
State.Column = State.Stack.back().FirstLessLess;
} else if (Current.isMemberAccess()) {
if (State.Stack.back().CallContinuation == 0) {
State.Column = ContinuationIndent;
State.Stack.back().CallContinuation = State.Column;
} else {
State.Column = State.Stack.back().CallContinuation;
}
} else if (State.Stack.back().QuestionColumn != 0 &&
(Current.Type == TT_ConditionalExpr ||
Previous.Type == TT_ConditionalExpr)) {
State.Column = State.Stack.back().QuestionColumn;
} else if (Previous.is(tok::comma) && State.Stack.back().VariablePos != 0) {
State.Column = State.Stack.back().VariablePos;
} else if ((PreviousNonComment &&
PreviousNonComment->ClosesTemplateDeclaration) ||
((Current.Type == TT_StartOfName ||
Current.is(tok::kw_operator)) &&
State.ParenLevel == 0 &&
(!Style.IndentFunctionDeclarationAfterType ||
State.Line->StartsDefinition))) {
State.Column = State.Stack.back().Indent;
} else if (Current.Type == TT_ObjCSelectorName) {
if (State.Stack.back().ColonPos == 0) {
State.Stack.back().ColonPos =
State.Stack.back().Indent + Current.LongestObjCSelectorName;
State.Column = State.Stack.back().ColonPos - Current.ColumnWidth;
} else if (State.Stack.back().ColonPos > Current.ColumnWidth) {
State.Column = State.Stack.back().ColonPos - Current.ColumnWidth;
} else {
State.Column = State.Stack.back().Indent;
State.Stack.back().ColonPos = State.Column + Current.ColumnWidth;
}
} else if (Current.Type == TT_ArraySubscriptLSquare) {
if (State.Stack.back().StartOfArraySubscripts != 0)
State.Column = State.Stack.back().StartOfArraySubscripts;
else
State.Column = ContinuationIndent;
} else if (Current.Type == TT_StartOfName ||
Previous.isOneOf(tok::coloncolon, tok::equal) ||
Previous.Type == TT_ObjCMethodExpr) {
State.Column = ContinuationIndent;
} else if (Current.Type == TT_CtorInitializerColon) {
State.Column = State.FirstIndent + Style.ConstructorInitializerIndentWidth;
} else if (Current.Type == TT_CtorInitializerComma) {
State.Column = State.Stack.back().Indent;
} else {
State.Column = State.Stack.back().Indent;
if (State.Column == State.FirstIndent &&
PreviousNonComment->isNot(tok::r_brace))
State.Column += Style.ContinuationIndentWidth;
}
if ((Previous.isOneOf(tok::comma, tok::semi) &&
!State.Stack.back().AvoidBinPacking) ||
Previous.Type == TT_BinaryOperator)
State.Stack.back().BreakBeforeParameter = false;
if (Previous.Type == TT_TemplateCloser && State.ParenLevel == 0)
State.Stack.back().BreakBeforeParameter = false;
if (Current.is(tok::question) ||
(PreviousNonComment && PreviousNonComment->is(tok::question)))
State.Stack.back().BreakBeforeParameter = true;
if (!DryRun) {
unsigned Newlines = 1;
if (Current.is(tok::comment))
Newlines = std::max(Newlines, std::min(Current.NewlinesBefore,
Style.MaxEmptyLinesToKeep + 1));
Whitespaces.replaceWhitespace(Current, Newlines,
State.Stack.back().IndentLevel, State.Column,
State.Column, State.Line->InPPDirective);
}
if (!Current.isTrailingComment())
State.Stack.back().LastSpace = State.Column;
if (Current.isMemberAccess())
State.Stack.back().LastSpace += Current.ColumnWidth;
State.StartOfLineLevel = State.ParenLevel;
State.LowestLevelOnLine = State.ParenLevel;
for (unsigned i = 0, e = State.Stack.size() - 1; i != e; ++i) {
State.Stack[i].BreakBeforeParameter = true;
}
if (PreviousNonComment &&
!PreviousNonComment->isOneOf(tok::comma, tok::semi) &&
PreviousNonComment->Type != TT_TemplateCloser &&
PreviousNonComment->Type != TT_BinaryOperator &&
Current.Type != TT_BinaryOperator &&
!PreviousNonComment->opensScope())
State.Stack.back().BreakBeforeParameter = true;
if (Previous.is(tok::l_brace) || Previous.Type == TT_ArrayInitializerLSquare)
State.Stack.back().BreakBeforeClosingBrace = true;
if (State.Stack.back().AvoidBinPacking) {
if (!(Previous.isOneOf(tok::l_paren, tok::l_brace) ||
Previous.Type == TT_BinaryOperator) ||
(!Style.AllowAllParametersOfDeclarationOnNextLine &&
State.Line->MustBeDeclaration))
State.Stack.back().BreakBeforeParameter = true;
}
return Penalty;
}
unsigned ContinuationIndenter::moveStateToNextToken(LineState &State,
bool DryRun, bool Newline) {
const FormatToken &Current = *State.NextToken;
assert(State.Stack.size());
if (Current.Type == TT_InheritanceColon)
State.Stack.back().AvoidBinPacking = true;
if (Current.is(tok::lessless) && State.Stack.back().FirstLessLess == 0)
State.Stack.back().FirstLessLess = State.Column;
if (Current.Type == TT_ArraySubscriptLSquare &&
State.Stack.back().StartOfArraySubscripts == 0)
State.Stack.back().StartOfArraySubscripts = State.Column;
if ((Current.is(tok::question) && Style.BreakBeforeTernaryOperators) ||
(Current.getPreviousNonComment() && Current.isNot(tok::colon) &&
Current.getPreviousNonComment()->is(tok::question) &&
!Style.BreakBeforeTernaryOperators))
State.Stack.back().QuestionColumn = State.Column;
if (!Current.opensScope() && !Current.closesScope())
State.LowestLevelOnLine =
std::min(State.LowestLevelOnLine, State.ParenLevel);
if (Current.isMemberAccess())
State.Stack.back().StartOfFunctionCall =
Current.LastInChainOfCalls ? 0 : State.Column + Current.ColumnWidth;
if (Current.Type == TT_CtorInitializerColon) {
State.Stack.back().Indent =
State.Column + (Style.BreakConstructorInitializersBeforeComma ? 0 : 2);
if (Style.ConstructorInitializerAllOnOneLineOrOnePerLine)
State.Stack.back().AvoidBinPacking = true;
State.Stack.back().BreakBeforeParameter = false;
}
if (Current.Type == TT_ObjCMethodSpecifier)
State.Stack.back().Indent += Style.ContinuationIndentWidth;
const FormatToken *Previous = Current.getPreviousNonComment();
bool SkipFirstExtraIndent =
(Previous && (Previous->opensScope() || Previous->is(tok::kw_return) ||
Previous->getPrecedence() == prec::Assignment ||
Previous->Type == TT_ObjCMethodExpr));
for (SmallVectorImpl<prec::Level>::const_reverse_iterator
I = Current.FakeLParens.rbegin(),
E = Current.FakeLParens.rend();
I != E; ++I) {
ParenState NewParenState = State.Stack.back();
NewParenState.ContainsLineBreak = false;
if (!Previous || Previous->isNot(tok::kw_return) || *I > 0)
NewParenState.Indent =
std::max(std::max(State.Column, NewParenState.Indent),
State.Stack.back().LastSpace);
if (*I > prec::Unknown)
NewParenState.LastSpace = std::max(NewParenState.LastSpace, State.Column);
if (*I == prec::Conditional ||
(!SkipFirstExtraIndent && *I > prec::Assignment &&
!Style.BreakBeforeBinaryOperators))
NewParenState.Indent += Style.ContinuationIndentWidth;
if ((Previous && !Previous->opensScope()) || *I > prec::Comma)
NewParenState.BreakBeforeParameter = false;
State.Stack.push_back(NewParenState);
SkipFirstExtraIndent = false;
}
if (Current.opensScope()) {
unsigned NewIndent;
unsigned NewIndentLevel = State.Stack.back().IndentLevel;
bool AvoidBinPacking;
bool BreakBeforeParameter = false;
if (Current.is(tok::l_brace) ||
Current.Type == TT_ArrayInitializerLSquare) {
if (Current.MatchingParen && Current.BlockKind == BK_Block) {
for (unsigned i = 0; i != Current.MatchingParen->FakeRParens; ++i)
State.Stack.pop_back();
NewIndent = State.Stack.back().LastSpace + Style.IndentWidth;
++NewIndentLevel;
BreakBeforeParameter = true;
} else {
NewIndent = State.Stack.back().LastSpace;
if (Current.opensBlockTypeList(Style)) {
NewIndent += Style.IndentWidth;
++NewIndentLevel;
} else {
NewIndent += Style.ContinuationIndentWidth;
}
}
const FormatToken *NextNoComment = Current.getNextNonComment();
AvoidBinPacking = Current.BlockKind == BK_Block ||
Current.Type == TT_ArrayInitializerLSquare ||
Current.Type == TT_DictLiteral ||
(NextNoComment &&
NextNoComment->Type == TT_DesignatedInitializerPeriod);
} else {
NewIndent = Style.ContinuationIndentWidth +
std::max(State.Stack.back().LastSpace,
State.Stack.back().StartOfFunctionCall);
AvoidBinPacking = !Style.BinPackParameters ||
(Style.ExperimentalAutoDetectBinPacking &&
(Current.PackingKind == PPK_OnePerLine ||
(!BinPackInconclusiveFunctions &&
Current.PackingKind == PPK_Inconclusive)));
if (Current.Type == TT_ObjCMethodExpr &&
getLengthToMatchingParen(Current) + State.Column >
getColumnLimit(State))
BreakBeforeParameter = true;
}
bool NoLineBreak = State.Stack.back().NoLineBreak ||
(Current.Type == TT_TemplateOpener &&
State.Stack.back().ContainsUnwrappedBuilder);
State.Stack.push_back(ParenState(NewIndent, NewIndentLevel,
State.Stack.back().LastSpace,
AvoidBinPacking, NoLineBreak));
State.Stack.back().BreakBeforeParameter = BreakBeforeParameter;
++State.ParenLevel;
}
if (State.Stack.size() > 1 &&
(Current.isOneOf(tok::r_paren, tok::r_square) ||
(Current.is(tok::r_brace) && State.NextToken != State.Line->First) ||
State.NextToken->Type == TT_TemplateCloser)) {
State.Stack.pop_back();
--State.ParenLevel;
}
if (Current.is(tok::r_square)) {
const FormatToken *NextNonComment = Current.getNextNonComment();
if (NextNonComment && NextNonComment->isNot(tok::l_square))
State.Stack.back().StartOfArraySubscripts = 0;
}
if (Current.isNot(tok::r_brace) ||
(Current.MatchingParen && Current.MatchingParen->BlockKind != BK_Block)) {
for (unsigned i = 0, e = Current.FakeRParens; i != e; ++i) {
unsigned VariablePos = State.Stack.back().VariablePos;
State.Stack.pop_back();
State.Stack.back().VariablePos = VariablePos;
}
}
if (Current.is(tok::string_literal) && State.StartOfStringLiteral == 0) {
State.StartOfStringLiteral = State.Column;
} else if (!Current.isOneOf(tok::comment, tok::identifier, tok::hash,
tok::string_literal)) {
State.StartOfStringLiteral = 0;
}
State.Column += Current.ColumnWidth;
State.NextToken = State.NextToken->Next;
unsigned Penalty = breakProtrudingToken(Current, State, DryRun);
if (State.Column > getColumnLimit(State)) {
unsigned ExcessCharacters = State.Column - getColumnLimit(State);
Penalty += Style.PenaltyExcessCharacter * ExcessCharacters;
}
if (Previous && Previous->Role)
Penalty += Previous->Role->format(State, this, DryRun);
return Penalty;
}
unsigned ContinuationIndenter::addMultilineToken(const FormatToken &Current,
LineState &State) {
for (unsigned i = 0, e = State.Stack.size(); i != e; ++i)
State.Stack[i].BreakBeforeParameter = true;
unsigned ColumnsUsed = State.Column;
State.Column = Current.LastLineColumnWidth;
if (ColumnsUsed > getColumnLimit(State))
return Style.PenaltyExcessCharacter * (ColumnsUsed - getColumnLimit(State));
return 0;
}
static bool getRawStringLiteralPrefixPostfix(StringRef Text,
StringRef &Prefix,
StringRef &Postfix) {
if (Text.startswith(Prefix = "R\"") || Text.startswith(Prefix = "uR\"") ||
Text.startswith(Prefix = "UR\"") || Text.startswith(Prefix = "u8R\"") ||
Text.startswith(Prefix = "LR\"")) {
size_t ParenPos = Text.find('(');
if (ParenPos != StringRef::npos) {
StringRef Delimiter =
Text.substr(Prefix.size(), ParenPos - Prefix.size());
Prefix = Text.substr(0, ParenPos + 1);
Postfix = Text.substr(Text.size() - 2 - Delimiter.size());
return Postfix.front() == ')' && Postfix.back() == '"' &&
Postfix.substr(1).startswith(Delimiter);
}
}
return false;
}
unsigned ContinuationIndenter::breakProtrudingToken(const FormatToken &Current,
LineState &State,
bool DryRun) {
if (Current.Type != TT_BlockComment && Current.IsMultiline)
return addMultilineToken(Current, State);
if (Current.Type == TT_ImplicitStringLiteral)
return 0;
if (!Current.isOneOf(tok::string_literal, tok::wide_string_literal,
tok::utf8_string_literal, tok::utf16_string_literal,
tok::utf32_string_literal, tok::comment))
return 0;
llvm::OwningPtr<BreakableToken> Token;
unsigned StartColumn = State.Column - Current.ColumnWidth;
if (Current.isOneOf(tok::string_literal, tok::wide_string_literal,
tok::utf8_string_literal, tok::utf16_string_literal,
tok::utf32_string_literal) &&
Current.Type != TT_ImplicitStringLiteral) {
if (State.Line->Type == LT_PreprocessorDirective)
return 0;
if (Current.IsUnterminatedLiteral)
return 0;
StringRef Text = Current.TokenText;
StringRef Prefix;
StringRef Postfix;
if ((Text.endswith(Postfix = "\"") &&
(Text.startswith(Prefix = "\"") || Text.startswith(Prefix = "u\"") ||
Text.startswith(Prefix = "U\"") || Text.startswith(Prefix = "u8\"") ||
Text.startswith(Prefix = "L\""))) ||
(Text.startswith(Prefix = "_T(\"") && Text.endswith(Postfix = "\")")) ||
getRawStringLiteralPrefixPostfix(Text, Prefix, Postfix)) {
Token.reset(new BreakableStringLiteral(
Current, State.Line->Level, StartColumn, Prefix, Postfix,
State.Line->InPPDirective, Encoding, Style));
} else {
return 0;
}
} else if (Current.Type == TT_BlockComment && Current.isTrailingComment()) {
Token.reset(new BreakableBlockComment(
Current, State.Line->Level, StartColumn, Current.OriginalColumn,
!Current.Previous, State.Line->InPPDirective, Encoding, Style));
} else if (Current.Type == TT_LineComment &&
(Current.Previous == NULL ||
Current.Previous->Type != TT_ImplicitStringLiteral)) {
Token.reset(new BreakableLineComment(Current, State.Line->Level,
StartColumn, State.Line->InPPDirective,
Encoding, Style));
} else {
return 0;
}
if (Current.UnbreakableTailLength >= getColumnLimit(State))
return 0;
unsigned RemainingSpace =
getColumnLimit(State) - Current.UnbreakableTailLength;
bool BreakInserted = false;
unsigned Penalty = 0;
unsigned RemainingTokenColumns = 0;
for (unsigned LineIndex = 0, EndIndex = Token->getLineCount();
LineIndex != EndIndex; ++LineIndex) {
if (!DryRun)
Token->replaceWhitespaceBefore(LineIndex, Whitespaces);
unsigned TailOffset = 0;
RemainingTokenColumns =
Token->getLineLengthAfterSplit(LineIndex, TailOffset, StringRef::npos);
while (RemainingTokenColumns > RemainingSpace) {
BreakableToken::Split Split =
Token->getSplit(LineIndex, TailOffset, getColumnLimit(State));
if (Split.first == StringRef::npos) {
if (LineIndex < EndIndex - 1)
Penalty += Style.PenaltyExcessCharacter *
(RemainingTokenColumns - RemainingSpace);
break;
}
assert(Split.first != 0);
unsigned NewRemainingTokenColumns = Token->getLineLengthAfterSplit(
LineIndex, TailOffset + Split.first + Split.second, StringRef::npos);
assert(NewRemainingTokenColumns < RemainingTokenColumns);
if (!DryRun)
Token->insertBreak(LineIndex, TailOffset, Split, Whitespaces);
Penalty += Current.SplitPenalty;
unsigned ColumnsUsed =
Token->getLineLengthAfterSplit(LineIndex, TailOffset, Split.first);
if (ColumnsUsed > getColumnLimit(State)) {
Penalty += Style.PenaltyExcessCharacter *
(ColumnsUsed - getColumnLimit(State));
}
TailOffset += Split.first + Split.second;
RemainingTokenColumns = NewRemainingTokenColumns;
BreakInserted = true;
}
}
State.Column = RemainingTokenColumns;
if (BreakInserted) {
if (Current.Type != TT_LineComment) {
for (unsigned i = 0, e = State.Stack.size(); i != e; ++i)
State.Stack[i].BreakBeforeParameter = true;
}
Penalty += Current.is(tok::string_literal) ? Style.PenaltyBreakString
: Style.PenaltyBreakComment;
State.Stack.back().LastSpace = StartColumn;
}
return Penalty;
}
unsigned ContinuationIndenter::getColumnLimit(const LineState &State) const {
return Style.ColumnLimit - (State.Line->InPPDirective ? 2 : 0);
}
bool ContinuationIndenter::NextIsMultilineString(const LineState &State) {
const FormatToken &Current = *State.NextToken;
if (!Current.is(tok::string_literal))
return false;
if (Current.TokenText.startswith("R\""))
return false;
if (Current.IsMultiline)
return true;
if (Current.getNextNonComment() &&
Current.getNextNonComment()->is(tok::string_literal))
return true; if (State.Column + Current.ColumnWidth + Current.UnbreakableTailLength >
Style.ColumnLimit)
return true; return false;
}
} }