forked from OSchip/llvm-project
1432 lines
62 KiB
C++
1432 lines
62 KiB
C++
//===--- ContinuationIndenter.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 the continuation indenter.
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///
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//===----------------------------------------------------------------------===//
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#include "BreakableToken.h"
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#include "ContinuationIndenter.h"
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#include "WhitespaceManager.h"
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#include "clang/Basic/OperatorPrecedence.h"
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#include "clang/Basic/SourceManager.h"
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#include "clang/Format/Format.h"
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#include "llvm/Support/Debug.h"
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#define DEBUG_TYPE "format-indenter"
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namespace clang {
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namespace format {
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// Returns the length of everything up to the first possible line break after
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// the ), ], } or > matching \c Tok.
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static unsigned getLengthToMatchingParen(const FormatToken &Tok) {
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if (!Tok.MatchingParen)
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return 0;
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FormatToken *End = Tok.MatchingParen;
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while (End->Next && !End->Next->CanBreakBefore) {
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End = End->Next;
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}
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return End->TotalLength - Tok.TotalLength + 1;
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}
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static unsigned getLengthToNextOperator(const FormatToken &Tok) {
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if (!Tok.NextOperator)
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return 0;
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return Tok.NextOperator->TotalLength - Tok.TotalLength;
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}
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// Returns \c true if \c Tok is the "." or "->" of a call and starts the next
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// segment of a builder type call.
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static bool startsSegmentOfBuilderTypeCall(const FormatToken &Tok) {
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return Tok.isMemberAccess() && Tok.Previous && Tok.Previous->closesScope();
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}
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// Returns \c true if \c Current starts a new parameter.
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static bool startsNextParameter(const FormatToken &Current,
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const FormatStyle &Style) {
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const FormatToken &Previous = *Current.Previous;
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if (Current.is(TT_CtorInitializerComma) &&
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Style.BreakConstructorInitializers == FormatStyle::BCIS_BeforeComma)
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return true;
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if (Style.Language == FormatStyle::LK_Proto && Current.is(TT_SelectorName))
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return true;
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return Previous.is(tok::comma) && !Current.isTrailingComment() &&
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((Previous.isNot(TT_CtorInitializerComma) ||
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Style.BreakConstructorInitializers !=
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FormatStyle::BCIS_BeforeComma) &&
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(Previous.isNot(TT_InheritanceComma) ||
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!Style.BreakBeforeInheritanceComma));
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}
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static bool opensProtoMessageField(const FormatToken &LessTok,
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const FormatStyle &Style) {
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if (LessTok.isNot(tok::less))
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return false;
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return Style.Language == FormatStyle::LK_TextProto ||
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(Style.Language == FormatStyle::LK_Proto &&
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(LessTok.NestingLevel > 0 ||
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(LessTok.Previous && LessTok.Previous->is(tok::equal))));
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}
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ContinuationIndenter::ContinuationIndenter(const FormatStyle &Style,
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const AdditionalKeywords &Keywords,
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const SourceManager &SourceMgr,
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WhitespaceManager &Whitespaces,
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encoding::Encoding Encoding,
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bool BinPackInconclusiveFunctions)
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: Style(Style), Keywords(Keywords), SourceMgr(SourceMgr),
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Whitespaces(Whitespaces), Encoding(Encoding),
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BinPackInconclusiveFunctions(BinPackInconclusiveFunctions),
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CommentPragmasRegex(Style.CommentPragmas) {}
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LineState ContinuationIndenter::getInitialState(unsigned FirstIndent,
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const AnnotatedLine *Line,
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bool DryRun) {
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LineState State;
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State.FirstIndent = FirstIndent;
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State.Column = FirstIndent;
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State.Line = Line;
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State.NextToken = Line->First;
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State.Stack.push_back(ParenState(FirstIndent, FirstIndent,
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/*AvoidBinPacking=*/false,
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/*NoLineBreak=*/false));
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State.LineContainsContinuedForLoopSection = false;
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State.StartOfStringLiteral = 0;
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State.StartOfLineLevel = 0;
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State.LowestLevelOnLine = 0;
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State.IgnoreStackForComparison = false;
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if (Style.Language == FormatStyle::LK_TextProto) {
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// We need this in order to deal with the bin packing of text fields at
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// global scope.
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State.Stack.back().AvoidBinPacking = true;
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State.Stack.back().BreakBeforeParameter = true;
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}
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// The first token has already been indented and thus consumed.
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moveStateToNextToken(State, DryRun, /*Newline=*/false);
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return State;
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}
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bool ContinuationIndenter::canBreak(const LineState &State) {
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const FormatToken &Current = *State.NextToken;
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const FormatToken &Previous = *Current.Previous;
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assert(&Previous == Current.Previous);
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if (!Current.CanBreakBefore &&
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!(State.Stack.back().BreakBeforeClosingBrace &&
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Current.closesBlockOrBlockTypeList(Style)))
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return false;
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// The opening "{" of a braced list has to be on the same line as the first
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// element if it is nested in another braced init list or function call.
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if (!Current.MustBreakBefore && Previous.is(tok::l_brace) &&
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Previous.isNot(TT_DictLiteral) && Previous.BlockKind == BK_BracedInit &&
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Previous.Previous &&
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Previous.Previous->isOneOf(tok::l_brace, tok::l_paren, tok::comma))
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return false;
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// This prevents breaks like:
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// ...
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// SomeParameter, OtherParameter).DoSomething(
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// ...
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// As they hide "DoSomething" and are generally bad for readability.
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if (Previous.opensScope() && Previous.isNot(tok::l_brace) &&
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State.LowestLevelOnLine < State.StartOfLineLevel &&
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State.LowestLevelOnLine < Current.NestingLevel)
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return false;
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if (Current.isMemberAccess() && State.Stack.back().ContainsUnwrappedBuilder)
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return false;
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// Don't create a 'hanging' indent if there are multiple blocks in a single
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// statement.
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if (Previous.is(tok::l_brace) && State.Stack.size() > 1 &&
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State.Stack[State.Stack.size() - 2].NestedBlockInlined &&
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State.Stack[State.Stack.size() - 2].HasMultipleNestedBlocks)
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return false;
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// Don't break after very short return types (e.g. "void") as that is often
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// unexpected.
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if (Current.is(TT_FunctionDeclarationName) && State.Column < 6) {
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if (Style.AlwaysBreakAfterReturnType == FormatStyle::RTBS_None)
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return false;
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}
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// If binary operators are moved to the next line (including commas for some
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// styles of constructor initializers), that's always ok.
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if (!Current.isOneOf(TT_BinaryOperator, tok::comma) &&
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State.Stack.back().NoLineBreakInOperand)
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return false;
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return !State.Stack.back().NoLineBreak;
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}
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bool ContinuationIndenter::mustBreak(const LineState &State) {
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const FormatToken &Current = *State.NextToken;
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const FormatToken &Previous = *Current.Previous;
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if (Current.MustBreakBefore || Current.is(TT_InlineASMColon))
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return true;
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if (State.Stack.back().BreakBeforeClosingBrace &&
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Current.closesBlockOrBlockTypeList(Style))
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return true;
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if (Previous.is(tok::semi) && State.LineContainsContinuedForLoopSection)
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return true;
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if ((startsNextParameter(Current, Style) || Previous.is(tok::semi) ||
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(Previous.is(TT_TemplateCloser) && Current.is(TT_StartOfName) &&
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Style.isCpp() &&
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// FIXME: This is a temporary workaround for the case where clang-format
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// sets BreakBeforeParameter to avoid bin packing and this creates a
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// completely unnecessary line break after a template type that isn't
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// line-wrapped.
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(Previous.NestingLevel == 1 || Style.BinPackParameters)) ||
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(Style.BreakBeforeTernaryOperators && Current.is(TT_ConditionalExpr) &&
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Previous.isNot(tok::question)) ||
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(!Style.BreakBeforeTernaryOperators &&
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Previous.is(TT_ConditionalExpr))) &&
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State.Stack.back().BreakBeforeParameter && !Current.isTrailingComment() &&
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!Current.isOneOf(tok::r_paren, tok::r_brace))
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return true;
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if (((Previous.is(TT_DictLiteral) && Previous.is(tok::l_brace)) ||
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(Previous.is(TT_ArrayInitializerLSquare) &&
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Previous.ParameterCount > 1) ||
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opensProtoMessageField(Previous, Style)) &&
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Style.ColumnLimit > 0 &&
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getLengthToMatchingParen(Previous) + State.Column - 1 >
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getColumnLimit(State))
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return true;
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const FormatToken &BreakConstructorInitializersToken =
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Style.BreakConstructorInitializers == FormatStyle::BCIS_AfterColon
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? Previous
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: Current;
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if (BreakConstructorInitializersToken.is(TT_CtorInitializerColon) &&
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(State.Column + State.Line->Last->TotalLength - Previous.TotalLength >
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getColumnLimit(State) ||
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State.Stack.back().BreakBeforeParameter) &&
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(Style.AllowShortFunctionsOnASingleLine != FormatStyle::SFS_All ||
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Style.BreakConstructorInitializers != FormatStyle::BCIS_BeforeColon ||
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Style.ColumnLimit != 0))
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return true;
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if (Current.is(TT_ObjCMethodExpr) && !Previous.is(TT_SelectorName) &&
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State.Line->startsWith(TT_ObjCMethodSpecifier))
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return true;
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if (Current.is(TT_SelectorName) && State.Stack.back().ObjCSelectorNameFound &&
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State.Stack.back().BreakBeforeParameter)
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return true;
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unsigned NewLineColumn = getNewLineColumn(State);
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if (Current.isMemberAccess() && Style.ColumnLimit != 0 &&
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State.Column + getLengthToNextOperator(Current) > Style.ColumnLimit &&
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(State.Column > NewLineColumn ||
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Current.NestingLevel < State.StartOfLineLevel))
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return true;
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if (startsSegmentOfBuilderTypeCall(Current) &&
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(State.Stack.back().CallContinuation != 0 ||
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State.Stack.back().BreakBeforeParameter) &&
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// JavaScript is treated different here as there is a frequent pattern:
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// SomeFunction(function() {
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// ...
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// }.bind(...));
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// FIXME: We should find a more generic solution to this problem.
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!(State.Column <= NewLineColumn &&
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Style.Language == FormatStyle::LK_JavaScript))
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return true;
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if (State.Column <= NewLineColumn)
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return false;
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if (Style.AlwaysBreakBeforeMultilineStrings &&
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(NewLineColumn == State.FirstIndent + Style.ContinuationIndentWidth ||
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Previous.is(tok::comma) || Current.NestingLevel < 2) &&
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!Previous.isOneOf(tok::kw_return, tok::lessless, tok::at) &&
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!Previous.isOneOf(TT_InlineASMColon, TT_ConditionalExpr) &&
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nextIsMultilineString(State))
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return true;
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// Using CanBreakBefore here and below takes care of the decision whether the
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// current style uses wrapping before or after operators for the given
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// operator.
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if (Previous.is(TT_BinaryOperator) && Current.CanBreakBefore) {
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// If we need to break somewhere inside the LHS of a binary expression, we
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// should also break after the operator. Otherwise, the formatting would
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// hide the operator precedence, e.g. in:
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// if (aaaaaaaaaaaaaa ==
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// bbbbbbbbbbbbbb && c) {..
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// For comparisons, we only apply this rule, if the LHS is a binary
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// expression itself as otherwise, the line breaks seem superfluous.
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// We need special cases for ">>" which we have split into two ">" while
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// lexing in order to make template parsing easier.
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bool IsComparison = (Previous.getPrecedence() == prec::Relational ||
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Previous.getPrecedence() == prec::Equality) &&
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Previous.Previous &&
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Previous.Previous->isNot(TT_BinaryOperator); // For >>.
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bool LHSIsBinaryExpr =
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Previous.Previous && Previous.Previous->EndsBinaryExpression;
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if ((!IsComparison || LHSIsBinaryExpr) && !Current.isTrailingComment() &&
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Previous.getPrecedence() != prec::Assignment &&
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State.Stack.back().BreakBeforeParameter)
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return true;
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} else if (Current.is(TT_BinaryOperator) && Current.CanBreakBefore &&
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State.Stack.back().BreakBeforeParameter) {
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return true;
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}
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// Same as above, but for the first "<<" operator.
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if (Current.is(tok::lessless) && Current.isNot(TT_OverloadedOperator) &&
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State.Stack.back().BreakBeforeParameter &&
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State.Stack.back().FirstLessLess == 0)
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return true;
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if (Current.NestingLevel == 0 && !Current.isTrailingComment()) {
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// Always break after "template <...>" and leading annotations. This is only
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// for cases where the entire line does not fit on a single line as a
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// different LineFormatter would be used otherwise.
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if (Previous.ClosesTemplateDeclaration)
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return true;
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if (Previous.is(TT_FunctionAnnotationRParen))
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return true;
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if (Previous.is(TT_LeadingJavaAnnotation) && Current.isNot(tok::l_paren) &&
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Current.isNot(TT_LeadingJavaAnnotation))
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return true;
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}
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// If the return type spans multiple lines, wrap before the function name.
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if ((Current.is(TT_FunctionDeclarationName) ||
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(Current.is(tok::kw_operator) && !Previous.is(tok::coloncolon))) &&
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!Previous.is(tok::kw_template) && State.Stack.back().BreakBeforeParameter)
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return true;
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// The following could be precomputed as they do not depend on the state.
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// However, as they should take effect only if the UnwrappedLine does not fit
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// into the ColumnLimit, they are checked here in the ContinuationIndenter.
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if (Style.ColumnLimit != 0 && Previous.BlockKind == BK_Block &&
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Previous.is(tok::l_brace) && !Current.isOneOf(tok::r_brace, tok::comment))
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return true;
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if (Current.is(tok::lessless) &&
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((Previous.is(tok::identifier) && Previous.TokenText == "endl") ||
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(Previous.Tok.isLiteral() && (Previous.TokenText.endswith("\\n\"") ||
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Previous.TokenText == "\'\\n\'"))))
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return true;
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return false;
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}
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unsigned ContinuationIndenter::addTokenToState(LineState &State, bool Newline,
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bool DryRun,
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unsigned ExtraSpaces) {
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const FormatToken &Current = *State.NextToken;
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assert(!State.Stack.empty());
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if ((Current.is(TT_ImplicitStringLiteral) &&
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(Current.Previous->Tok.getIdentifierInfo() == nullptr ||
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Current.Previous->Tok.getIdentifierInfo()->getPPKeywordID() ==
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tok::pp_not_keyword))) {
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unsigned EndColumn =
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SourceMgr.getSpellingColumnNumber(Current.WhitespaceRange.getEnd());
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if (Current.LastNewlineOffset != 0) {
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// If there is a newline within this token, the final column will solely
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// determined by the current end column.
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State.Column = EndColumn;
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} else {
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unsigned StartColumn =
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SourceMgr.getSpellingColumnNumber(Current.WhitespaceRange.getBegin());
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assert(EndColumn >= StartColumn);
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State.Column += EndColumn - StartColumn;
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}
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moveStateToNextToken(State, DryRun, /*Newline=*/false);
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return 0;
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}
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unsigned Penalty = 0;
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if (Newline)
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Penalty = addTokenOnNewLine(State, DryRun);
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else
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addTokenOnCurrentLine(State, DryRun, ExtraSpaces);
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return moveStateToNextToken(State, DryRun, Newline) + Penalty;
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}
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void ContinuationIndenter::addTokenOnCurrentLine(LineState &State, bool DryRun,
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unsigned ExtraSpaces) {
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FormatToken &Current = *State.NextToken;
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const FormatToken &Previous = *State.NextToken->Previous;
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if (Current.is(tok::equal) &&
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(State.Line->First->is(tok::kw_for) || Current.NestingLevel == 0) &&
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State.Stack.back().VariablePos == 0) {
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State.Stack.back().VariablePos = State.Column;
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// Move over * and & if they are bound to the variable name.
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const FormatToken *Tok = &Previous;
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while (Tok && State.Stack.back().VariablePos >= Tok->ColumnWidth) {
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State.Stack.back().VariablePos -= Tok->ColumnWidth;
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if (Tok->SpacesRequiredBefore != 0)
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break;
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Tok = Tok->Previous;
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}
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if (Previous.PartOfMultiVariableDeclStmt)
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State.Stack.back().LastSpace = State.Stack.back().VariablePos;
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}
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unsigned Spaces = Current.SpacesRequiredBefore + ExtraSpaces;
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if (!DryRun)
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Whitespaces.replaceWhitespace(Current, /*Newlines=*/0, Spaces,
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State.Column + Spaces);
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// If "BreakBeforeInheritanceComma" mode, don't break within the inheritance
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// declaration unless there is multiple inheritance.
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if (Style.BreakBeforeInheritanceComma && Current.is(TT_InheritanceColon))
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State.Stack.back().NoLineBreak = true;
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if (Current.is(TT_SelectorName) &&
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!State.Stack.back().ObjCSelectorNameFound) {
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unsigned MinIndent =
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std::max(State.FirstIndent + Style.ContinuationIndentWidth,
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State.Stack.back().Indent);
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unsigned FirstColonPos = State.Column + Spaces + Current.ColumnWidth;
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if (Current.LongestObjCSelectorName == 0)
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State.Stack.back().AlignColons = false;
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else if (MinIndent + Current.LongestObjCSelectorName > FirstColonPos)
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State.Stack.back().ColonPos = MinIndent + Current.LongestObjCSelectorName;
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else
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State.Stack.back().ColonPos = FirstColonPos;
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}
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// In "AlwaysBreak" mode, enforce wrapping directly after the parenthesis by
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// disallowing any further line breaks if there is no line break after the
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// opening parenthesis. Don't break if it doesn't conserve columns.
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if (Style.AlignAfterOpenBracket == FormatStyle::BAS_AlwaysBreak &&
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Previous.isOneOf(tok::l_paren, TT_TemplateOpener, tok::l_square) &&
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State.Column > getNewLineColumn(State) &&
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(!Previous.Previous ||
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!Previous.Previous->isOneOf(tok::kw_for, tok::kw_while,
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tok::kw_switch)) &&
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// Don't do this for simple (no expressions) one-argument function calls
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// as that feels like needlessly wasting whitespace, e.g.:
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//
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// caaaaaaaaaaaall(
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// caaaaaaaaaaaall(
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// caaaaaaaaaaaall(
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// caaaaaaaaaaaaaaaaaaaaaaall(aaaaaaaaaaaaaa, aaaaaaaaa))));
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Current.FakeLParens.size() > 0 &&
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Current.FakeLParens.back() > prec::Unknown)
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State.Stack.back().NoLineBreak = true;
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if (Previous.is(TT_TemplateString) && Previous.opensScope())
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State.Stack.back().NoLineBreak = true;
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if (Style.AlignAfterOpenBracket != FormatStyle::BAS_DontAlign &&
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Previous.opensScope() && Previous.isNot(TT_ObjCMethodExpr) &&
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(Current.isNot(TT_LineComment) || Previous.BlockKind == BK_BracedInit))
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State.Stack.back().Indent = State.Column + Spaces;
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if (State.Stack.back().AvoidBinPacking && startsNextParameter(Current, Style))
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State.Stack.back().NoLineBreak = true;
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if (startsSegmentOfBuilderTypeCall(Current) &&
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State.Column > getNewLineColumn(State))
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State.Stack.back().ContainsUnwrappedBuilder = true;
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if (Current.is(TT_LambdaArrow) && Style.Language == FormatStyle::LK_Java)
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State.Stack.back().NoLineBreak = true;
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if (Current.isMemberAccess() && Previous.is(tok::r_paren) &&
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(Previous.MatchingParen &&
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(Previous.TotalLength - Previous.MatchingParen->TotalLength > 10)))
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// If there is a function call with long parameters, break before trailing
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// calls. This prevents things like:
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// EXPECT_CALL(SomeLongParameter).Times(
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// 2);
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// We don't want to do this for short parameters as they can just be
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// indexes.
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State.Stack.back().NoLineBreak = true;
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// Don't allow the RHS of an operator to be split over multiple lines unless
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// there is a line-break right after the operator.
|
|
// Exclude relational operators, as there, it is always more desirable to
|
|
// have the LHS 'left' of the RHS.
|
|
const FormatToken *P = Current.getPreviousNonComment();
|
|
if (!Current.is(tok::comment) && P &&
|
|
(P->isOneOf(TT_BinaryOperator, tok::comma) ||
|
|
(P->is(TT_ConditionalExpr) && P->is(tok::colon))) &&
|
|
!P->isOneOf(TT_OverloadedOperator, TT_CtorInitializerComma) &&
|
|
P->getPrecedence() != prec::Assignment &&
|
|
P->getPrecedence() != prec::Relational) {
|
|
bool BreakBeforeOperator =
|
|
P->MustBreakBefore || P->is(tok::lessless) ||
|
|
(P->is(TT_BinaryOperator) &&
|
|
Style.BreakBeforeBinaryOperators != FormatStyle::BOS_None) ||
|
|
(P->is(TT_ConditionalExpr) && Style.BreakBeforeTernaryOperators);
|
|
// Don't do this if there are only two operands. In these cases, there is
|
|
// always a nice vertical separation between them and the extra line break
|
|
// does not help.
|
|
bool HasTwoOperands =
|
|
P->OperatorIndex == 0 && !P->NextOperator && !P->is(TT_ConditionalExpr);
|
|
if ((!BreakBeforeOperator && !(HasTwoOperands && Style.AlignOperands)) ||
|
|
(!State.Stack.back().LastOperatorWrapped && BreakBeforeOperator))
|
|
State.Stack.back().NoLineBreakInOperand = true;
|
|
}
|
|
|
|
State.Column += Spaces;
|
|
if (Current.isNot(tok::comment) && Previous.is(tok::l_paren) &&
|
|
Previous.Previous &&
|
|
(Previous.Previous->isOneOf(tok::kw_if, tok::kw_for) ||
|
|
Previous.Previous->endsSequence(tok::kw_constexpr, tok::kw_if))) {
|
|
// Treat the condition inside an if as if it was a second function
|
|
// parameter, i.e. let nested calls have a continuation indent.
|
|
State.Stack.back().LastSpace = State.Column;
|
|
State.Stack.back().NestedBlockIndent = State.Column;
|
|
} else if (!Current.isOneOf(tok::comment, tok::caret) &&
|
|
((Previous.is(tok::comma) &&
|
|
!Previous.is(TT_OverloadedOperator)) ||
|
|
(Previous.is(tok::colon) && Previous.is(TT_ObjCMethodExpr)))) {
|
|
State.Stack.back().LastSpace = State.Column;
|
|
} else if (Previous.is(TT_CtorInitializerColon) &&
|
|
Style.BreakConstructorInitializers ==
|
|
FormatStyle::BCIS_AfterColon) {
|
|
State.Stack.back().Indent = State.Column;
|
|
State.Stack.back().LastSpace = State.Column;
|
|
} else if ((Previous.isOneOf(TT_BinaryOperator, TT_ConditionalExpr,
|
|
TT_CtorInitializerColon)) &&
|
|
((Previous.getPrecedence() != prec::Assignment &&
|
|
(Previous.isNot(tok::lessless) || Previous.OperatorIndex != 0 ||
|
|
Previous.NextOperator)) ||
|
|
Current.StartsBinaryExpression)) {
|
|
// Indent relative to the RHS of the expression unless this is a simple
|
|
// assignment without binary expression on the RHS. Also indent relative to
|
|
// unary operators and the colons of constructor initializers.
|
|
State.Stack.back().LastSpace = State.Column;
|
|
} else if (Previous.is(TT_InheritanceColon)) {
|
|
State.Stack.back().Indent = State.Column;
|
|
State.Stack.back().LastSpace = State.Column;
|
|
} else if (Previous.opensScope()) {
|
|
// If a function has a trailing call, indent all parameters from the
|
|
// opening parenthesis. This avoids confusing indents like:
|
|
// OuterFunction(InnerFunctionCall( // break
|
|
// ParameterToInnerFunction)) // break
|
|
// .SecondInnerFunctionCall();
|
|
bool HasTrailingCall = false;
|
|
if (Previous.MatchingParen) {
|
|
const FormatToken *Next = Previous.MatchingParen->getNextNonComment();
|
|
HasTrailingCall = Next && Next->isMemberAccess();
|
|
}
|
|
if (HasTrailingCall && State.Stack.size() > 1 &&
|
|
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;
|
|
|
|
// Extra penalty that needs to be added because of the way certain line
|
|
// breaks are chosen.
|
|
unsigned Penalty = 0;
|
|
|
|
const FormatToken *PreviousNonComment = Current.getPreviousNonComment();
|
|
const FormatToken *NextNonComment = Previous.getNextNonComment();
|
|
if (!NextNonComment)
|
|
NextNonComment = &Current;
|
|
// The first line break on any NestingLevel causes an extra penalty in order
|
|
// prefer similar line breaks.
|
|
if (!State.Stack.back().ContainsLineBreak)
|
|
Penalty += 15;
|
|
State.Stack.back().ContainsLineBreak = true;
|
|
|
|
Penalty += State.NextToken->SplitPenalty;
|
|
|
|
// Breaking before the first "<<" is generally not desirable if the LHS is
|
|
// short. Also always add the penalty if the LHS is split over multiple lines
|
|
// to avoid unnecessary line breaks that just work around this penalty.
|
|
if (NextNonComment->is(tok::lessless) &&
|
|
State.Stack.back().FirstLessLess == 0 &&
|
|
(State.Column <= Style.ColumnLimit / 3 ||
|
|
State.Stack.back().BreakBeforeParameter))
|
|
Penalty += Style.PenaltyBreakFirstLessLess;
|
|
|
|
State.Column = getNewLineColumn(State);
|
|
|
|
// Indent nested blocks relative to this column, unless in a very specific
|
|
// JavaScript special case where:
|
|
//
|
|
// var loooooong_name =
|
|
// function() {
|
|
// // code
|
|
// }
|
|
//
|
|
// is common and should be formatted like a free-standing function. The same
|
|
// goes for wrapping before the lambda return type arrow.
|
|
if (!Current.is(TT_LambdaArrow) &&
|
|
(Style.Language != FormatStyle::LK_JavaScript ||
|
|
Current.NestingLevel != 0 || !PreviousNonComment ||
|
|
!PreviousNonComment->is(tok::equal) ||
|
|
!Current.isOneOf(Keywords.kw_async, Keywords.kw_function)))
|
|
State.Stack.back().NestedBlockIndent = State.Column;
|
|
|
|
if (NextNonComment->isMemberAccess()) {
|
|
if (State.Stack.back().CallContinuation == 0)
|
|
State.Stack.back().CallContinuation = State.Column;
|
|
} else if (NextNonComment->is(TT_SelectorName)) {
|
|
if (!State.Stack.back().ObjCSelectorNameFound) {
|
|
if (NextNonComment->LongestObjCSelectorName == 0) {
|
|
State.Stack.back().AlignColons = false;
|
|
} else {
|
|
State.Stack.back().ColonPos =
|
|
(Style.IndentWrappedFunctionNames
|
|
? std::max(State.Stack.back().Indent,
|
|
State.FirstIndent + Style.ContinuationIndentWidth)
|
|
: State.Stack.back().Indent) +
|
|
NextNonComment->LongestObjCSelectorName;
|
|
}
|
|
} else if (State.Stack.back().AlignColons &&
|
|
State.Stack.back().ColonPos <= NextNonComment->ColumnWidth) {
|
|
State.Stack.back().ColonPos = State.Column + NextNonComment->ColumnWidth;
|
|
}
|
|
} else if (PreviousNonComment && PreviousNonComment->is(tok::colon) &&
|
|
PreviousNonComment->isOneOf(TT_ObjCMethodExpr, TT_DictLiteral)) {
|
|
// FIXME: This is hacky, find a better way. The problem is that in an ObjC
|
|
// method expression, the block should be aligned to the line starting it,
|
|
// e.g.:
|
|
// [aaaaaaaaaaaaaaa aaaaaaaaa: \\ break for some reason
|
|
// ^(int *i) {
|
|
// // ...
|
|
// }];
|
|
// Thus, we set LastSpace of the next higher NestingLevel, to which we move
|
|
// when we consume all of the "}"'s FakeRParens at the "{".
|
|
if (State.Stack.size() > 1)
|
|
State.Stack[State.Stack.size() - 2].LastSpace =
|
|
std::max(State.Stack.back().LastSpace, State.Stack.back().Indent) +
|
|
Style.ContinuationIndentWidth;
|
|
}
|
|
|
|
if ((PreviousNonComment &&
|
|
PreviousNonComment->isOneOf(tok::comma, tok::semi) &&
|
|
!State.Stack.back().AvoidBinPacking) ||
|
|
Previous.is(TT_BinaryOperator))
|
|
State.Stack.back().BreakBeforeParameter = false;
|
|
if (Previous.isOneOf(TT_TemplateCloser, TT_JavaAnnotation) &&
|
|
Current.NestingLevel == 0)
|
|
State.Stack.back().BreakBeforeParameter = false;
|
|
if (NextNonComment->is(tok::question) ||
|
|
(PreviousNonComment && PreviousNonComment->is(tok::question)))
|
|
State.Stack.back().BreakBeforeParameter = true;
|
|
if (Current.is(TT_BinaryOperator) && Current.CanBreakBefore)
|
|
State.Stack.back().BreakBeforeParameter = false;
|
|
|
|
if (!DryRun) {
|
|
unsigned Newlines = std::max(
|
|
1u, std::min(Current.NewlinesBefore, Style.MaxEmptyLinesToKeep + 1));
|
|
bool ContinuePPDirective =
|
|
State.Line->InPPDirective && State.Line->Type != LT_ImportStatement;
|
|
Whitespaces.replaceWhitespace(Current, Newlines, State.Column, State.Column,
|
|
ContinuePPDirective);
|
|
}
|
|
|
|
if (!Current.isTrailingComment())
|
|
State.Stack.back().LastSpace = State.Column;
|
|
if (Current.is(tok::lessless))
|
|
// If we are breaking before a "<<", we always want to indent relative to
|
|
// RHS. This is necessary only for "<<", as we special-case it and don't
|
|
// always indent relative to the RHS.
|
|
State.Stack.back().LastSpace += 3; // 3 -> width of "<< ".
|
|
|
|
State.StartOfLineLevel = Current.NestingLevel;
|
|
State.LowestLevelOnLine = Current.NestingLevel;
|
|
|
|
// Any break on this level means that the parent level has been broken
|
|
// and we need to avoid bin packing there.
|
|
bool NestedBlockSpecialCase =
|
|
!Style.isCpp() && Current.is(tok::r_brace) && State.Stack.size() > 1 &&
|
|
State.Stack[State.Stack.size() - 2].NestedBlockInlined;
|
|
if (!NestedBlockSpecialCase)
|
|
for (unsigned i = 0, e = State.Stack.size() - 1; i != e; ++i)
|
|
State.Stack[i].BreakBeforeParameter = true;
|
|
|
|
if (PreviousNonComment &&
|
|
!PreviousNonComment->isOneOf(tok::comma, tok::colon, tok::semi) &&
|
|
(PreviousNonComment->isNot(TT_TemplateCloser) ||
|
|
Current.NestingLevel != 0) &&
|
|
!PreviousNonComment->isOneOf(
|
|
TT_BinaryOperator, TT_FunctionAnnotationRParen, TT_JavaAnnotation,
|
|
TT_LeadingJavaAnnotation) &&
|
|
Current.isNot(TT_BinaryOperator) && !PreviousNonComment->opensScope())
|
|
State.Stack.back().BreakBeforeParameter = true;
|
|
|
|
// If we break after { or the [ of an array initializer, we should also break
|
|
// before the corresponding } or ].
|
|
if (PreviousNonComment &&
|
|
(PreviousNonComment->isOneOf(tok::l_brace, TT_ArrayInitializerLSquare) ||
|
|
opensProtoMessageField(*PreviousNonComment, Style) ||
|
|
(PreviousNonComment->is(TT_TemplateString) &&
|
|
PreviousNonComment->opensScope())))
|
|
State.Stack.back().BreakBeforeClosingBrace = true;
|
|
|
|
if (State.Stack.back().AvoidBinPacking) {
|
|
// If we are breaking after '(', '{', '<', this is not bin packing
|
|
// unless AllowAllParametersOfDeclarationOnNextLine is false or this is a
|
|
// dict/object literal.
|
|
if (!Previous.isOneOf(tok::l_paren, tok::l_brace, TT_BinaryOperator) ||
|
|
(!Style.AllowAllParametersOfDeclarationOnNextLine &&
|
|
State.Line->MustBeDeclaration) ||
|
|
Previous.is(TT_DictLiteral))
|
|
State.Stack.back().BreakBeforeParameter = true;
|
|
}
|
|
|
|
return Penalty;
|
|
}
|
|
|
|
unsigned ContinuationIndenter::getNewLineColumn(const LineState &State) {
|
|
if (!State.NextToken || !State.NextToken->Previous)
|
|
return 0;
|
|
FormatToken &Current = *State.NextToken;
|
|
const FormatToken &Previous = *Current.Previous;
|
|
// If we are continuing an expression, we want to use the continuation indent.
|
|
unsigned ContinuationIndent =
|
|
std::max(State.Stack.back().LastSpace, State.Stack.back().Indent) +
|
|
Style.ContinuationIndentWidth;
|
|
const FormatToken *PreviousNonComment = Current.getPreviousNonComment();
|
|
const FormatToken *NextNonComment = Previous.getNextNonComment();
|
|
if (!NextNonComment)
|
|
NextNonComment = &Current;
|
|
|
|
// Java specific bits.
|
|
if (Style.Language == FormatStyle::LK_Java &&
|
|
Current.isOneOf(Keywords.kw_implements, Keywords.kw_extends))
|
|
return std::max(State.Stack.back().LastSpace,
|
|
State.Stack.back().Indent + Style.ContinuationIndentWidth);
|
|
|
|
if (NextNonComment->is(tok::l_brace) && NextNonComment->BlockKind == BK_Block)
|
|
return Current.NestingLevel == 0 ? State.FirstIndent
|
|
: State.Stack.back().Indent;
|
|
if ((Current.isOneOf(tok::r_brace, tok::r_square) ||
|
|
(Current.is(tok::greater) &&
|
|
(Style.Language == FormatStyle::LK_Proto ||
|
|
Style.Language == FormatStyle::LK_TextProto))) &&
|
|
State.Stack.size() > 1) {
|
|
if (Current.closesBlockOrBlockTypeList(Style))
|
|
return State.Stack[State.Stack.size() - 2].NestedBlockIndent;
|
|
if (Current.MatchingParen &&
|
|
Current.MatchingParen->BlockKind == BK_BracedInit)
|
|
return State.Stack[State.Stack.size() - 2].LastSpace;
|
|
return State.FirstIndent;
|
|
}
|
|
// Indent a closing parenthesis at the previous level if followed by a semi or
|
|
// opening brace. This allows indentations such as:
|
|
// foo(
|
|
// a,
|
|
// );
|
|
// function foo(
|
|
// a,
|
|
// ) {
|
|
// code(); //
|
|
// }
|
|
if (Current.is(tok::r_paren) && State.Stack.size() > 1 &&
|
|
(!Current.Next || Current.Next->isOneOf(tok::semi, tok::l_brace)))
|
|
return State.Stack[State.Stack.size() - 2].LastSpace;
|
|
if (NextNonComment->is(TT_TemplateString) && NextNonComment->closesScope())
|
|
return State.Stack[State.Stack.size() - 2].LastSpace;
|
|
if (Current.is(tok::identifier) && Current.Next &&
|
|
Current.Next->is(TT_DictLiteral))
|
|
return State.Stack.back().Indent;
|
|
if (NextNonComment->is(TT_ObjCStringLiteral) &&
|
|
State.StartOfStringLiteral != 0)
|
|
return State.StartOfStringLiteral - 1;
|
|
if (NextNonComment->isStringLiteral() && State.StartOfStringLiteral != 0)
|
|
return State.StartOfStringLiteral;
|
|
if (NextNonComment->is(tok::lessless) &&
|
|
State.Stack.back().FirstLessLess != 0)
|
|
return State.Stack.back().FirstLessLess;
|
|
if (NextNonComment->isMemberAccess()) {
|
|
if (State.Stack.back().CallContinuation == 0)
|
|
return ContinuationIndent;
|
|
return State.Stack.back().CallContinuation;
|
|
}
|
|
if (State.Stack.back().QuestionColumn != 0 &&
|
|
((NextNonComment->is(tok::colon) &&
|
|
NextNonComment->is(TT_ConditionalExpr)) ||
|
|
Previous.is(TT_ConditionalExpr)))
|
|
return State.Stack.back().QuestionColumn;
|
|
if (Previous.is(tok::comma) && State.Stack.back().VariablePos != 0)
|
|
return State.Stack.back().VariablePos;
|
|
if ((PreviousNonComment &&
|
|
(PreviousNonComment->ClosesTemplateDeclaration ||
|
|
PreviousNonComment->isOneOf(
|
|
TT_AttributeParen, TT_FunctionAnnotationRParen, TT_JavaAnnotation,
|
|
TT_LeadingJavaAnnotation))) ||
|
|
(!Style.IndentWrappedFunctionNames &&
|
|
NextNonComment->isOneOf(tok::kw_operator, TT_FunctionDeclarationName)))
|
|
return std::max(State.Stack.back().LastSpace, State.Stack.back().Indent);
|
|
if (NextNonComment->is(TT_SelectorName)) {
|
|
if (!State.Stack.back().ObjCSelectorNameFound) {
|
|
if (NextNonComment->LongestObjCSelectorName == 0)
|
|
return State.Stack.back().Indent;
|
|
return (Style.IndentWrappedFunctionNames
|
|
? std::max(State.Stack.back().Indent,
|
|
State.FirstIndent + Style.ContinuationIndentWidth)
|
|
: State.Stack.back().Indent) +
|
|
NextNonComment->LongestObjCSelectorName -
|
|
NextNonComment->ColumnWidth;
|
|
}
|
|
if (!State.Stack.back().AlignColons)
|
|
return State.Stack.back().Indent;
|
|
if (State.Stack.back().ColonPos > NextNonComment->ColumnWidth)
|
|
return State.Stack.back().ColonPos - NextNonComment->ColumnWidth;
|
|
return State.Stack.back().Indent;
|
|
}
|
|
if (NextNonComment->is(tok::colon) && NextNonComment->is(TT_ObjCMethodExpr))
|
|
return State.Stack.back().ColonPos;
|
|
if (NextNonComment->is(TT_ArraySubscriptLSquare)) {
|
|
if (State.Stack.back().StartOfArraySubscripts != 0)
|
|
return State.Stack.back().StartOfArraySubscripts;
|
|
return ContinuationIndent;
|
|
}
|
|
|
|
// This ensure that we correctly format ObjC methods calls without inputs,
|
|
// i.e. where the last element isn't selector like: [callee method];
|
|
if (NextNonComment->is(tok::identifier) && NextNonComment->FakeRParens == 0 &&
|
|
NextNonComment->Next && NextNonComment->Next->is(TT_ObjCMethodExpr))
|
|
return State.Stack.back().Indent;
|
|
|
|
if (NextNonComment->isOneOf(TT_StartOfName, TT_PointerOrReference) ||
|
|
Previous.isOneOf(tok::coloncolon, tok::equal, TT_JsTypeColon))
|
|
return ContinuationIndent;
|
|
if (PreviousNonComment && PreviousNonComment->is(tok::colon) &&
|
|
PreviousNonComment->isOneOf(TT_ObjCMethodExpr, TT_DictLiteral))
|
|
return ContinuationIndent;
|
|
if (NextNonComment->is(TT_CtorInitializerComma))
|
|
return State.Stack.back().Indent;
|
|
if (PreviousNonComment && PreviousNonComment->is(TT_CtorInitializerColon) &&
|
|
Style.BreakConstructorInitializers == FormatStyle::BCIS_AfterColon)
|
|
return State.Stack.back().Indent;
|
|
if (NextNonComment->isOneOf(TT_CtorInitializerColon, TT_InheritanceColon,
|
|
TT_InheritanceComma))
|
|
return State.FirstIndent + Style.ConstructorInitializerIndentWidth;
|
|
if (Previous.is(tok::r_paren) && !Current.isBinaryOperator() &&
|
|
!Current.isOneOf(tok::colon, tok::comment))
|
|
return ContinuationIndent;
|
|
if (State.Stack.back().Indent == State.FirstIndent && PreviousNonComment &&
|
|
PreviousNonComment->isNot(tok::r_brace))
|
|
// Ensure that we fall back to the continuation indent width instead of
|
|
// just flushing continuations left.
|
|
return State.Stack.back().Indent + Style.ContinuationIndentWidth;
|
|
return State.Stack.back().Indent;
|
|
}
|
|
|
|
unsigned ContinuationIndenter::moveStateToNextToken(LineState &State,
|
|
bool DryRun, bool Newline) {
|
|
assert(State.Stack.size());
|
|
const FormatToken &Current = *State.NextToken;
|
|
|
|
if (Current.isOneOf(tok::comma, TT_BinaryOperator))
|
|
State.Stack.back().NoLineBreakInOperand = false;
|
|
if (Current.is(TT_InheritanceColon))
|
|
State.Stack.back().AvoidBinPacking = true;
|
|
if (Current.is(tok::lessless) && Current.isNot(TT_OverloadedOperator)) {
|
|
if (State.Stack.back().FirstLessLess == 0)
|
|
State.Stack.back().FirstLessLess = State.Column;
|
|
else
|
|
State.Stack.back().LastOperatorWrapped = Newline;
|
|
}
|
|
if (Current.is(TT_BinaryOperator) && Current.isNot(tok::lessless))
|
|
State.Stack.back().LastOperatorWrapped = Newline;
|
|
if (Current.is(TT_ConditionalExpr) && Current.Previous &&
|
|
!Current.Previous->is(TT_ConditionalExpr))
|
|
State.Stack.back().LastOperatorWrapped = Newline;
|
|
if (Current.is(TT_ArraySubscriptLSquare) &&
|
|
State.Stack.back().StartOfArraySubscripts == 0)
|
|
State.Stack.back().StartOfArraySubscripts = State.Column;
|
|
if (Style.BreakBeforeTernaryOperators && Current.is(tok::question))
|
|
State.Stack.back().QuestionColumn = State.Column;
|
|
if (!Style.BreakBeforeTernaryOperators && Current.isNot(tok::colon)) {
|
|
const FormatToken *Previous = Current.Previous;
|
|
while (Previous && Previous->isTrailingComment())
|
|
Previous = Previous->Previous;
|
|
if (Previous && Previous->is(tok::question))
|
|
State.Stack.back().QuestionColumn = State.Column;
|
|
}
|
|
if (!Current.opensScope() && !Current.closesScope() &&
|
|
!Current.is(TT_PointerOrReference))
|
|
State.LowestLevelOnLine =
|
|
std::min(State.LowestLevelOnLine, Current.NestingLevel);
|
|
if (Current.isMemberAccess())
|
|
State.Stack.back().StartOfFunctionCall =
|
|
!Current.NextOperator ? 0 : State.Column;
|
|
if (Current.is(TT_SelectorName)) {
|
|
State.Stack.back().ObjCSelectorNameFound = true;
|
|
if (Style.IndentWrappedFunctionNames) {
|
|
State.Stack.back().Indent =
|
|
State.FirstIndent + Style.ContinuationIndentWidth;
|
|
}
|
|
}
|
|
if (Current.is(TT_CtorInitializerColon) &&
|
|
Style.BreakConstructorInitializers != FormatStyle::BCIS_AfterColon) {
|
|
// Indent 2 from the column, so:
|
|
// SomeClass::SomeClass()
|
|
// : First(...), ...
|
|
// Next(...)
|
|
// ^ line up here.
|
|
State.Stack.back().Indent =
|
|
State.Column + (Style.BreakConstructorInitializers ==
|
|
FormatStyle::BCIS_BeforeComma ? 0 : 2);
|
|
State.Stack.back().NestedBlockIndent = State.Stack.back().Indent;
|
|
if (Style.ConstructorInitializerAllOnOneLineOrOnePerLine)
|
|
State.Stack.back().AvoidBinPacking = true;
|
|
State.Stack.back().BreakBeforeParameter = false;
|
|
}
|
|
if (Current.is(TT_CtorInitializerColon) &&
|
|
Style.BreakConstructorInitializers == FormatStyle::BCIS_AfterColon) {
|
|
State.Stack.back().Indent =
|
|
State.FirstIndent + Style.ConstructorInitializerIndentWidth;
|
|
State.Stack.back().NestedBlockIndent = State.Stack.back().Indent;
|
|
if (Style.ConstructorInitializerAllOnOneLineOrOnePerLine)
|
|
State.Stack.back().AvoidBinPacking = true;
|
|
}
|
|
if (Current.is(TT_InheritanceColon))
|
|
State.Stack.back().Indent =
|
|
State.FirstIndent + Style.ContinuationIndentWidth;
|
|
if (Current.isOneOf(TT_BinaryOperator, TT_ConditionalExpr) && Newline)
|
|
State.Stack.back().NestedBlockIndent =
|
|
State.Column + Current.ColumnWidth + 1;
|
|
if (Current.isOneOf(TT_LambdaLSquare, TT_LambdaArrow))
|
|
State.Stack.back().LastSpace = State.Column;
|
|
|
|
// Insert scopes created by fake parenthesis.
|
|
const FormatToken *Previous = Current.getPreviousNonComment();
|
|
|
|
// Add special behavior to support a format commonly used for JavaScript
|
|
// closures:
|
|
// SomeFunction(function() {
|
|
// foo();
|
|
// bar();
|
|
// }, a, b, c);
|
|
if (Current.isNot(tok::comment) && Previous &&
|
|
Previous->isOneOf(tok::l_brace, TT_ArrayInitializerLSquare) &&
|
|
!Previous->is(TT_DictLiteral) && State.Stack.size() > 1) {
|
|
if (State.Stack[State.Stack.size() - 2].NestedBlockInlined && Newline)
|
|
for (unsigned i = 0, e = State.Stack.size() - 1; i != e; ++i)
|
|
State.Stack[i].NoLineBreak = true;
|
|
State.Stack[State.Stack.size() - 2].NestedBlockInlined = false;
|
|
}
|
|
if (Previous && (Previous->isOneOf(tok::l_paren, tok::comma, tok::colon) ||
|
|
Previous->isOneOf(TT_BinaryOperator, TT_ConditionalExpr)) &&
|
|
!Previous->isOneOf(TT_DictLiteral, TT_ObjCMethodExpr)) {
|
|
State.Stack.back().NestedBlockInlined =
|
|
!Newline &&
|
|
(Previous->isNot(tok::l_paren) || Previous->ParameterCount > 1);
|
|
}
|
|
|
|
moveStatePastFakeLParens(State, Newline);
|
|
moveStatePastScopeCloser(State);
|
|
if (Current.is(TT_TemplateString) && Current.opensScope())
|
|
State.Stack.back().LastSpace =
|
|
(Current.IsMultiline ? Current.LastLineColumnWidth
|
|
: State.Column + Current.ColumnWidth) -
|
|
strlen("${");
|
|
bool CanBreakProtrudingToken = !State.Stack.back().NoLineBreak &&
|
|
!State.Stack.back().NoLineBreakInOperand;
|
|
moveStatePastScopeOpener(State, Newline);
|
|
moveStatePastFakeRParens(State);
|
|
|
|
if (Current.is(TT_ObjCStringLiteral) && State.StartOfStringLiteral == 0)
|
|
State.StartOfStringLiteral = State.Column + 1;
|
|
else if (Current.isStringLiteral() && State.StartOfStringLiteral == 0)
|
|
State.StartOfStringLiteral = State.Column;
|
|
else if (!Current.isOneOf(tok::comment, tok::identifier, tok::hash) &&
|
|
!Current.isStringLiteral())
|
|
State.StartOfStringLiteral = 0;
|
|
|
|
State.Column += Current.ColumnWidth;
|
|
State.NextToken = State.NextToken->Next;
|
|
unsigned Penalty = 0;
|
|
if (CanBreakProtrudingToken)
|
|
Penalty = breakProtrudingToken(Current, State, DryRun);
|
|
if (State.Column > getColumnLimit(State)) {
|
|
unsigned ExcessCharacters = State.Column - getColumnLimit(State);
|
|
Penalty += Style.PenaltyExcessCharacter * ExcessCharacters;
|
|
}
|
|
|
|
if (Current.Role)
|
|
Current.Role->formatFromToken(State, this, DryRun);
|
|
// If the previous has a special role, let it consume tokens as appropriate.
|
|
// It is necessary to start at the previous token for the only implemented
|
|
// role (comma separated list). That way, the decision whether or not to break
|
|
// after the "{" is already done and both options are tried and evaluated.
|
|
// FIXME: This is ugly, find a better way.
|
|
if (Previous && Previous->Role)
|
|
Penalty += Previous->Role->formatAfterToken(State, this, DryRun);
|
|
|
|
return Penalty;
|
|
}
|
|
|
|
void ContinuationIndenter::moveStatePastFakeLParens(LineState &State,
|
|
bool Newline) {
|
|
const FormatToken &Current = *State.NextToken;
|
|
const FormatToken *Previous = Current.getPreviousNonComment();
|
|
|
|
// Don't add extra indentation for the first fake parenthesis after
|
|
// 'return', assignments or opening <({[. The indentation for these cases
|
|
// is special cased.
|
|
bool SkipFirstExtraIndent =
|
|
(Previous && (Previous->opensScope() ||
|
|
Previous->isOneOf(tok::semi, tok::kw_return) ||
|
|
(Previous->getPrecedence() == prec::Assignment &&
|
|
Style.AlignOperands) ||
|
|
Previous->is(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;
|
|
NewParenState.LastOperatorWrapped = true;
|
|
NewParenState.NoLineBreak =
|
|
NewParenState.NoLineBreak || State.Stack.back().NoLineBreakInOperand;
|
|
|
|
// Don't propagate AvoidBinPacking into subexpressions of arg/param lists.
|
|
if (*I > prec::Comma)
|
|
NewParenState.AvoidBinPacking = false;
|
|
|
|
// Indent from 'LastSpace' unless these are fake parentheses encapsulating
|
|
// a builder type call after 'return' or, if the alignment after opening
|
|
// brackets is disabled.
|
|
if (!Current.isTrailingComment() &&
|
|
(Style.AlignOperands || *I < prec::Assignment) &&
|
|
(!Previous || Previous->isNot(tok::kw_return) ||
|
|
(Style.Language != FormatStyle::LK_Java && *I > 0)) &&
|
|
(Style.AlignAfterOpenBracket != FormatStyle::BAS_DontAlign ||
|
|
*I != prec::Comma || Current.NestingLevel == 0))
|
|
NewParenState.Indent =
|
|
std::max(std::max(State.Column, NewParenState.Indent),
|
|
State.Stack.back().LastSpace);
|
|
|
|
// Do not indent relative to the fake parentheses inserted for "." or "->".
|
|
// This is a special case to make the following to statements consistent:
|
|
// OuterFunction(InnerFunctionCall( // break
|
|
// ParameterToInnerFunction));
|
|
// OuterFunction(SomeObject.InnerFunctionCall( // break
|
|
// ParameterToInnerFunction));
|
|
if (*I > prec::Unknown)
|
|
NewParenState.LastSpace = std::max(NewParenState.LastSpace, State.Column);
|
|
if (*I != prec::Conditional && !Current.is(TT_UnaryOperator) &&
|
|
Style.AlignAfterOpenBracket != FormatStyle::BAS_DontAlign)
|
|
NewParenState.StartOfFunctionCall = State.Column;
|
|
|
|
// Always indent conditional expressions. Never indent expression where
|
|
// the 'operator' is ',', ';' or an assignment (i.e. *I <=
|
|
// prec::Assignment) as those have different indentation rules. Indent
|
|
// other expression, unless the indentation needs to be skipped.
|
|
if (*I == prec::Conditional ||
|
|
(!SkipFirstExtraIndent && *I > prec::Assignment &&
|
|
!Current.isTrailingComment()))
|
|
NewParenState.Indent += Style.ContinuationIndentWidth;
|
|
if ((Previous && !Previous->opensScope()) || *I != prec::Comma)
|
|
NewParenState.BreakBeforeParameter = false;
|
|
State.Stack.push_back(NewParenState);
|
|
SkipFirstExtraIndent = false;
|
|
}
|
|
}
|
|
|
|
void ContinuationIndenter::moveStatePastFakeRParens(LineState &State) {
|
|
for (unsigned i = 0, e = State.NextToken->FakeRParens; i != e; ++i) {
|
|
unsigned VariablePos = State.Stack.back().VariablePos;
|
|
if (State.Stack.size() == 1) {
|
|
// Do not pop the last element.
|
|
break;
|
|
}
|
|
State.Stack.pop_back();
|
|
State.Stack.back().VariablePos = VariablePos;
|
|
}
|
|
}
|
|
|
|
void ContinuationIndenter::moveStatePastScopeOpener(LineState &State,
|
|
bool Newline) {
|
|
const FormatToken &Current = *State.NextToken;
|
|
if (!Current.opensScope())
|
|
return;
|
|
|
|
if (Current.MatchingParen && Current.BlockKind == BK_Block) {
|
|
moveStateToNewBlock(State);
|
|
return;
|
|
}
|
|
|
|
unsigned NewIndent;
|
|
unsigned LastSpace = State.Stack.back().LastSpace;
|
|
bool AvoidBinPacking;
|
|
bool BreakBeforeParameter = false;
|
|
unsigned NestedBlockIndent = std::max(State.Stack.back().StartOfFunctionCall,
|
|
State.Stack.back().NestedBlockIndent);
|
|
if (Current.isOneOf(tok::l_brace, TT_ArrayInitializerLSquare) ||
|
|
opensProtoMessageField(Current, Style)) {
|
|
if (Current.opensBlockOrBlockTypeList(Style)) {
|
|
NewIndent = Style.IndentWidth +
|
|
std::min(State.Column, State.Stack.back().NestedBlockIndent);
|
|
} else {
|
|
NewIndent = State.Stack.back().LastSpace + Style.ContinuationIndentWidth;
|
|
}
|
|
const FormatToken *NextNoComment = Current.getNextNonComment();
|
|
bool EndsInComma = Current.MatchingParen &&
|
|
Current.MatchingParen->Previous &&
|
|
Current.MatchingParen->Previous->is(tok::comma);
|
|
AvoidBinPacking =
|
|
EndsInComma || Current.is(TT_DictLiteral) ||
|
|
Style.Language == FormatStyle::LK_Proto ||
|
|
Style.Language == FormatStyle::LK_TextProto ||
|
|
!Style.BinPackArguments ||
|
|
(NextNoComment &&
|
|
NextNoComment->isOneOf(TT_DesignatedInitializerPeriod,
|
|
TT_DesignatedInitializerLSquare));
|
|
BreakBeforeParameter = EndsInComma;
|
|
if (Current.ParameterCount > 1)
|
|
NestedBlockIndent = std::max(NestedBlockIndent, State.Column + 1);
|
|
} else {
|
|
NewIndent = Style.ContinuationIndentWidth +
|
|
std::max(State.Stack.back().LastSpace,
|
|
State.Stack.back().StartOfFunctionCall);
|
|
|
|
// Ensure that different different brackets force relative alignment, e.g.:
|
|
// void SomeFunction(vector< // break
|
|
// int> v);
|
|
// FIXME: We likely want to do this for more combinations of brackets.
|
|
// Verify that it is wanted for ObjC, too.
|
|
if (Current.is(tok::less) && Current.ParentBracket == tok::l_paren) {
|
|
NewIndent = std::max(NewIndent, State.Stack.back().Indent);
|
|
LastSpace = std::max(LastSpace, State.Stack.back().Indent);
|
|
}
|
|
|
|
// JavaScript template strings are special as we always want to indent
|
|
// nested expressions relative to the ${}. Otherwise, this can create quite
|
|
// a mess.
|
|
if (Current.is(TT_TemplateString)) {
|
|
unsigned Column = Current.IsMultiline
|
|
? Current.LastLineColumnWidth
|
|
: State.Column + Current.ColumnWidth;
|
|
NewIndent = Column;
|
|
LastSpace = Column;
|
|
NestedBlockIndent = Column;
|
|
}
|
|
|
|
bool EndsInComma =
|
|
Current.MatchingParen &&
|
|
Current.MatchingParen->getPreviousNonComment() &&
|
|
Current.MatchingParen->getPreviousNonComment()->is(tok::comma);
|
|
|
|
AvoidBinPacking =
|
|
(Style.Language == FormatStyle::LK_JavaScript && EndsInComma) ||
|
|
(State.Line->MustBeDeclaration && !Style.BinPackParameters) ||
|
|
(!State.Line->MustBeDeclaration && !Style.BinPackArguments) ||
|
|
(Style.ExperimentalAutoDetectBinPacking &&
|
|
(Current.PackingKind == PPK_OnePerLine ||
|
|
(!BinPackInconclusiveFunctions &&
|
|
Current.PackingKind == PPK_Inconclusive)));
|
|
|
|
if (Current.is(TT_ObjCMethodExpr) && Current.MatchingParen) {
|
|
if (Style.ColumnLimit) {
|
|
// If this '[' opens an ObjC call, determine whether all parameters fit
|
|
// into one line and put one per line if they don't.
|
|
if (getLengthToMatchingParen(Current) + State.Column >
|
|
getColumnLimit(State))
|
|
BreakBeforeParameter = true;
|
|
} else {
|
|
// For ColumnLimit = 0, we have to figure out whether there is or has to
|
|
// be a line break within this call.
|
|
for (const FormatToken *Tok = &Current;
|
|
Tok && Tok != Current.MatchingParen; Tok = Tok->Next) {
|
|
if (Tok->MustBreakBefore ||
|
|
(Tok->CanBreakBefore && Tok->NewlinesBefore > 0)) {
|
|
BreakBeforeParameter = true;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (Style.Language == FormatStyle::LK_JavaScript && EndsInComma)
|
|
BreakBeforeParameter = true;
|
|
}
|
|
// Generally inherit NoLineBreak from the current scope to nested scope.
|
|
// However, don't do this for non-empty nested blocks, dict literals and
|
|
// array literals as these follow different indentation rules.
|
|
bool NoLineBreak =
|
|
Current.Children.empty() &&
|
|
!Current.isOneOf(TT_DictLiteral, TT_ArrayInitializerLSquare) &&
|
|
(State.Stack.back().NoLineBreak ||
|
|
State.Stack.back().NoLineBreakInOperand ||
|
|
(Current.is(TT_TemplateOpener) &&
|
|
State.Stack.back().ContainsUnwrappedBuilder));
|
|
State.Stack.push_back(
|
|
ParenState(NewIndent, LastSpace, AvoidBinPacking, NoLineBreak));
|
|
State.Stack.back().NestedBlockIndent = NestedBlockIndent;
|
|
State.Stack.back().BreakBeforeParameter = BreakBeforeParameter;
|
|
State.Stack.back().HasMultipleNestedBlocks = Current.BlockParameterCount > 1;
|
|
}
|
|
|
|
void ContinuationIndenter::moveStatePastScopeCloser(LineState &State) {
|
|
const FormatToken &Current = *State.NextToken;
|
|
if (!Current.closesScope())
|
|
return;
|
|
|
|
// If we encounter a closing ), ], } or >, we can remove a level from our
|
|
// stacks.
|
|
if (State.Stack.size() > 1 &&
|
|
(Current.isOneOf(tok::r_paren, tok::r_square, TT_TemplateString) ||
|
|
(Current.is(tok::r_brace) && State.NextToken != State.Line->First) ||
|
|
State.NextToken->is(TT_TemplateCloser)))
|
|
State.Stack.pop_back();
|
|
|
|
if (Current.is(tok::r_square)) {
|
|
// If this ends the array subscript expr, reset the corresponding value.
|
|
const FormatToken *NextNonComment = Current.getNextNonComment();
|
|
if (NextNonComment && NextNonComment->isNot(tok::l_square))
|
|
State.Stack.back().StartOfArraySubscripts = 0;
|
|
}
|
|
}
|
|
|
|
void ContinuationIndenter::moveStateToNewBlock(LineState &State) {
|
|
unsigned NestedBlockIndent = State.Stack.back().NestedBlockIndent;
|
|
// ObjC block sometimes follow special indentation rules.
|
|
unsigned NewIndent =
|
|
NestedBlockIndent + (State.NextToken->is(TT_ObjCBlockLBrace)
|
|
? Style.ObjCBlockIndentWidth
|
|
: Style.IndentWidth);
|
|
State.Stack.push_back(ParenState(NewIndent, State.Stack.back().LastSpace,
|
|
/*AvoidBinPacking=*/true,
|
|
/*NoLineBreak=*/false));
|
|
State.Stack.back().NestedBlockIndent = NestedBlockIndent;
|
|
State.Stack.back().BreakBeforeParameter = true;
|
|
}
|
|
|
|
unsigned ContinuationIndenter::addMultilineToken(const FormatToken &Current,
|
|
LineState &State) {
|
|
if (!Current.IsMultiline)
|
|
return 0;
|
|
|
|
// Break before further function parameters on all levels.
|
|
for (unsigned i = 0, e = State.Stack.size(); i != e; ++i)
|
|
State.Stack[i].BreakBeforeParameter = true;
|
|
|
|
unsigned ColumnsUsed = State.Column;
|
|
// We can only affect layout of the first and the last line, so the penalty
|
|
// for all other lines is constant, and we ignore it.
|
|
State.Column = Current.LastLineColumnWidth;
|
|
|
|
if (ColumnsUsed > getColumnLimit(State))
|
|
return Style.PenaltyExcessCharacter * (ColumnsUsed - getColumnLimit(State));
|
|
return 0;
|
|
}
|
|
|
|
unsigned ContinuationIndenter::breakProtrudingToken(const FormatToken &Current,
|
|
LineState &State,
|
|
bool DryRun) {
|
|
// Don't break multi-line tokens other than block comments. Instead, just
|
|
// update the state.
|
|
if (Current.isNot(TT_BlockComment) && Current.IsMultiline)
|
|
return addMultilineToken(Current, State);
|
|
|
|
// Don't break implicit string literals or import statements.
|
|
if (Current.is(TT_ImplicitStringLiteral) ||
|
|
State.Line->Type == LT_ImportStatement)
|
|
return 0;
|
|
|
|
if (!Current.isStringLiteral() && !Current.is(tok::comment))
|
|
return 0;
|
|
|
|
std::unique_ptr<BreakableToken> Token;
|
|
unsigned StartColumn = State.Column - Current.ColumnWidth;
|
|
unsigned ColumnLimit = getColumnLimit(State);
|
|
|
|
if (Current.isStringLiteral()) {
|
|
// FIXME: String literal breaking is currently disabled for Java and JS, as
|
|
// it requires strings to be merged using "+" which we don't support.
|
|
if (Style.Language == FormatStyle::LK_Java ||
|
|
Style.Language == FormatStyle::LK_JavaScript ||
|
|
!Style.BreakStringLiterals)
|
|
return 0;
|
|
|
|
// Don't break string literals inside preprocessor directives (except for
|
|
// #define directives, as their contents are stored in separate lines and
|
|
// are not affected by this check).
|
|
// This way we avoid breaking code with line directives and unknown
|
|
// preprocessor directives that contain long string literals.
|
|
if (State.Line->Type == LT_PreprocessorDirective)
|
|
return 0;
|
|
// Exempts unterminated string literals from line breaking. The user will
|
|
// likely want to terminate the string before any line breaking is done.
|
|
if (Current.IsUnterminatedLiteral)
|
|
return 0;
|
|
|
|
StringRef Text = Current.TokenText;
|
|
StringRef Prefix;
|
|
StringRef Postfix;
|
|
// FIXME: Handle whitespace between '_T', '(', '"..."', and ')'.
|
|
// FIXME: Store Prefix and Suffix (or PrefixLength and SuffixLength to
|
|
// reduce the overhead) for each FormatToken, which is a string, so that we
|
|
// don't run multiple checks here on the hot path.
|
|
if ((Text.endswith(Postfix = "\"") &&
|
|
(Text.startswith(Prefix = "@\"") || 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 = "\")"))) {
|
|
Token.reset(new BreakableStringLiteral(Current, StartColumn, Prefix,
|
|
Postfix, State.Line->InPPDirective,
|
|
Encoding, Style));
|
|
} else {
|
|
return 0;
|
|
}
|
|
} else if (Current.is(TT_BlockComment)) {
|
|
if (!Current.isTrailingComment() || !Style.ReflowComments ||
|
|
// If a comment token switches formatting, like
|
|
// /* clang-format on */, we don't want to break it further,
|
|
// but we may still want to adjust its indentation.
|
|
switchesFormatting(Current))
|
|
return addMultilineToken(Current, State);
|
|
Token.reset(new BreakableBlockComment(
|
|
Current, StartColumn, Current.OriginalColumn, !Current.Previous,
|
|
State.Line->InPPDirective, Encoding, Style));
|
|
} else if (Current.is(TT_LineComment) &&
|
|
(Current.Previous == nullptr ||
|
|
Current.Previous->isNot(TT_ImplicitStringLiteral))) {
|
|
if (!Style.ReflowComments ||
|
|
CommentPragmasRegex.match(Current.TokenText.substr(2)) ||
|
|
switchesFormatting(Current))
|
|
return 0;
|
|
Token.reset(new BreakableLineCommentSection(
|
|
Current, StartColumn, Current.OriginalColumn, !Current.Previous,
|
|
/*InPPDirective=*/false, Encoding, Style));
|
|
// We don't insert backslashes when breaking line comments.
|
|
ColumnLimit = Style.ColumnLimit;
|
|
} else {
|
|
return 0;
|
|
}
|
|
if (Current.UnbreakableTailLength >= ColumnLimit)
|
|
return 0;
|
|
|
|
unsigned RemainingSpace = ColumnLimit - Current.UnbreakableTailLength;
|
|
bool BreakInserted = false;
|
|
// We use a conservative reflowing strategy. Reflow starts after a line is
|
|
// broken or the corresponding whitespace compressed. Reflow ends as soon as a
|
|
// line that doesn't get reflown with the previous line is reached.
|
|
bool ReflowInProgress = false;
|
|
unsigned Penalty = 0;
|
|
unsigned RemainingTokenColumns = 0;
|
|
for (unsigned LineIndex = 0, EndIndex = Token->getLineCount();
|
|
LineIndex != EndIndex; ++LineIndex) {
|
|
BreakableToken::Split SplitBefore(StringRef::npos, 0);
|
|
if (ReflowInProgress) {
|
|
SplitBefore = Token->getSplitBefore(LineIndex, RemainingTokenColumns,
|
|
RemainingSpace, CommentPragmasRegex);
|
|
}
|
|
ReflowInProgress = SplitBefore.first != StringRef::npos;
|
|
unsigned TailOffset =
|
|
ReflowInProgress ? (SplitBefore.first + SplitBefore.second) : 0;
|
|
if (!DryRun)
|
|
Token->replaceWhitespaceBefore(LineIndex, RemainingTokenColumns,
|
|
RemainingSpace, SplitBefore, Whitespaces);
|
|
RemainingTokenColumns = Token->getLineLengthAfterSplitBefore(
|
|
LineIndex, TailOffset, RemainingTokenColumns, ColumnLimit, SplitBefore);
|
|
while (RemainingTokenColumns > RemainingSpace) {
|
|
BreakableToken::Split Split = Token->getSplit(
|
|
LineIndex, TailOffset, ColumnLimit, CommentPragmasRegex);
|
|
if (Split.first == StringRef::npos) {
|
|
// The last line's penalty is handled in addNextStateToQueue().
|
|
if (LineIndex < EndIndex - 1)
|
|
Penalty += Style.PenaltyExcessCharacter *
|
|
(RemainingTokenColumns - RemainingSpace);
|
|
break;
|
|
}
|
|
assert(Split.first != 0);
|
|
|
|
// Check if compressing the whitespace range will bring the line length
|
|
// under the limit. If that is the case, we perform whitespace compression
|
|
// instead of inserting a line break.
|
|
unsigned RemainingTokenColumnsAfterCompression =
|
|
Token->getLineLengthAfterCompression(RemainingTokenColumns, Split);
|
|
if (RemainingTokenColumnsAfterCompression <= RemainingSpace) {
|
|
RemainingTokenColumns = RemainingTokenColumnsAfterCompression;
|
|
ReflowInProgress = true;
|
|
if (!DryRun)
|
|
Token->compressWhitespace(LineIndex, TailOffset, Split, Whitespaces);
|
|
break;
|
|
}
|
|
|
|
unsigned NewRemainingTokenColumns = Token->getLineLengthAfterSplit(
|
|
LineIndex, TailOffset + Split.first + Split.second, StringRef::npos);
|
|
|
|
// When breaking before a tab character, it may be moved by a few columns,
|
|
// but will still be expanded to the next tab stop, so we don't save any
|
|
// columns.
|
|
if (NewRemainingTokenColumns == RemainingTokenColumns)
|
|
break;
|
|
|
|
assert(NewRemainingTokenColumns < RemainingTokenColumns);
|
|
if (!DryRun)
|
|
Token->insertBreak(LineIndex, TailOffset, Split, Whitespaces);
|
|
Penalty += Current.SplitPenalty;
|
|
unsigned ColumnsUsed =
|
|
Token->getLineLengthAfterSplit(LineIndex, TailOffset, Split.first);
|
|
if (ColumnsUsed > ColumnLimit) {
|
|
Penalty += Style.PenaltyExcessCharacter * (ColumnsUsed - ColumnLimit);
|
|
}
|
|
TailOffset += Split.first + Split.second;
|
|
RemainingTokenColumns = NewRemainingTokenColumns;
|
|
ReflowInProgress = true;
|
|
BreakInserted = true;
|
|
}
|
|
}
|
|
|
|
State.Column = RemainingTokenColumns;
|
|
|
|
if (BreakInserted) {
|
|
// If we break the token inside a parameter list, we need to break before
|
|
// the next parameter on all levels, so that the next parameter is clearly
|
|
// visible. Line comments already introduce a break.
|
|
if (Current.isNot(TT_LineComment)) {
|
|
for (unsigned i = 0, e = State.Stack.size(); i != e; ++i)
|
|
State.Stack[i].BreakBeforeParameter = true;
|
|
}
|
|
|
|
Penalty += Current.isStringLiteral() ? Style.PenaltyBreakString
|
|
: Style.PenaltyBreakComment;
|
|
|
|
State.Stack.back().LastSpace = StartColumn;
|
|
}
|
|
|
|
Token->updateNextToken(State);
|
|
|
|
return Penalty;
|
|
}
|
|
|
|
unsigned ContinuationIndenter::getColumnLimit(const LineState &State) const {
|
|
// In preprocessor directives reserve two chars for trailing " \"
|
|
return Style.ColumnLimit - (State.Line->InPPDirective ? 2 : 0);
|
|
}
|
|
|
|
bool ContinuationIndenter::nextIsMultilineString(const LineState &State) {
|
|
const FormatToken &Current = *State.NextToken;
|
|
if (!Current.isStringLiteral() || Current.is(TT_ImplicitStringLiteral))
|
|
return false;
|
|
// We never consider raw string literals "multiline" for the purpose of
|
|
// AlwaysBreakBeforeMultilineStrings implementation as they are special-cased
|
|
// (see TokenAnnotator::mustBreakBefore().
|
|
if (Current.TokenText.startswith("R\""))
|
|
return false;
|
|
if (Current.IsMultiline)
|
|
return true;
|
|
if (Current.getNextNonComment() &&
|
|
Current.getNextNonComment()->isStringLiteral())
|
|
return true; // Implicit concatenation.
|
|
if (Style.ColumnLimit != 0 &&
|
|
State.Column + Current.ColumnWidth + Current.UnbreakableTailLength >
|
|
Style.ColumnLimit)
|
|
return true; // String will be split.
|
|
return false;
|
|
}
|
|
|
|
} // namespace format
|
|
} // namespace clang
|