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llvm-project/clang/lib/Format/Format.cpp
Daniel Jasper fb5e241183 Only keep empty lines in unwrapped lines if they preceed a line comment. 
Empty lines followed by line comments are often used to highlight the
comment. Empty lines somewhere else are usually left over from manual or
automatic formatting and should probably be removed.

Before (clang-format would keep):
S s = {
  a,

  b
};

After:
S s = { a, b };

llvm-svn: 176086
2013-02-26 13:10:34 +00:00

1395 lines
53 KiB
C++
Raw Blame History

//===--- Format.cpp - Format C++ code -------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
///
/// \file
/// \brief This file implements functions declared in Format.h. This will be
/// split into separate files as we go.
///
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "format-formatter"
#include "TokenAnnotator.h"
#include "UnwrappedLineParser.h"
#include "clang/Basic/Diagnostic.h"
#include "clang/Basic/OperatorPrecedence.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Format/Format.h"
#include "clang/Frontend/TextDiagnosticPrinter.h"
#include "clang/Lex/Lexer.h"
#include "llvm/Support/Allocator.h"
#include "llvm/Support/Debug.h"
#include <queue>
#include <string>
namespace clang {
namespace format {
FormatStyle getLLVMStyle() {
FormatStyle LLVMStyle;
LLVMStyle.ColumnLimit = 80;
LLVMStyle.MaxEmptyLinesToKeep = 1;
LLVMStyle.PointerBindsToType = false;
LLVMStyle.DerivePointerBinding = false;
LLVMStyle.AccessModifierOffset = -2;
LLVMStyle.Standard = FormatStyle::LS_Cpp03;
LLVMStyle.IndentCaseLabels = false;
LLVMStyle.SpacesBeforeTrailingComments = 1;
LLVMStyle.BinPackParameters = true;
LLVMStyle.AllowAllParametersOfDeclarationOnNextLine = true;
LLVMStyle.ConstructorInitializerAllOnOneLineOrOnePerLine = false;
LLVMStyle.AllowShortIfStatementsOnASingleLine = false;
LLVMStyle.ObjCSpaceBeforeProtocolList = true;
LLVMStyle.PenaltyExcessCharacter = 1000000;
LLVMStyle.PenaltyReturnTypeOnItsOwnLine = 5;
return LLVMStyle;
}
FormatStyle getGoogleStyle() {
FormatStyle GoogleStyle;
GoogleStyle.ColumnLimit = 80;
GoogleStyle.MaxEmptyLinesToKeep = 1;
GoogleStyle.PointerBindsToType = true;
GoogleStyle.DerivePointerBinding = true;
GoogleStyle.AccessModifierOffset = -1;
GoogleStyle.Standard = FormatStyle::LS_Auto;
GoogleStyle.IndentCaseLabels = true;
GoogleStyle.SpacesBeforeTrailingComments = 2;
GoogleStyle.BinPackParameters = false;
GoogleStyle.AllowAllParametersOfDeclarationOnNextLine = true;
GoogleStyle.ConstructorInitializerAllOnOneLineOrOnePerLine = true;
GoogleStyle.AllowShortIfStatementsOnASingleLine = false;
GoogleStyle.ObjCSpaceBeforeProtocolList = false;
GoogleStyle.PenaltyExcessCharacter = 1000000;
GoogleStyle.PenaltyReturnTypeOnItsOwnLine = 100;
return GoogleStyle;
}
FormatStyle getChromiumStyle() {
FormatStyle ChromiumStyle = getGoogleStyle();
ChromiumStyle.AllowAllParametersOfDeclarationOnNextLine = false;
ChromiumStyle.Standard = FormatStyle::LS_Cpp03;
ChromiumStyle.DerivePointerBinding = false;
return ChromiumStyle;
}
static bool isTrailingComment(const AnnotatedToken &Tok) {
return Tok.is(tok::comment) &&
(Tok.Children.empty() || Tok.Children[0].MustBreakBefore);
}
// Returns the length of everything up to the first possible line break after
// the ), ], } or > matching \c Tok.
static unsigned getLengthToMatchingParen(const AnnotatedToken &Tok) {
if (Tok.MatchingParen == NULL)
return 0;
AnnotatedToken *End = Tok.MatchingParen;
while (!End->Children.empty() && !End->Children[0].CanBreakBefore) {
End = &End->Children[0];
}
return End->TotalLength - Tok.TotalLength + 1;
}
/// \brief Manages the whitespaces around tokens and their replacements.
///
/// This includes special handling for certain constructs, e.g. the alignment of
/// trailing line comments.
class WhitespaceManager {
public:
WhitespaceManager(SourceManager &SourceMgr) : SourceMgr(SourceMgr) {}
/// \brief Replaces the whitespace in front of \p Tok. Only call once for
/// each \c AnnotatedToken.
void replaceWhitespace(const AnnotatedToken &Tok, unsigned NewLines,
unsigned Spaces, unsigned WhitespaceStartColumn,
const FormatStyle &Style) {
// 2+ newlines mean an empty line separating logic scopes.
if (NewLines >= 2)
alignComments();
// Align line comments if they are trailing or if they continue other
// trailing comments.
if (isTrailingComment(Tok) && (Tok.Parent != NULL || !Comments.empty())) {
if (Style.ColumnLimit >=
Spaces + WhitespaceStartColumn + Tok.FormatTok.TokenLength) {
Comments.push_back(StoredComment());
Comments.back().Tok = Tok.FormatTok;
Comments.back().Spaces = Spaces;
Comments.back().NewLines = NewLines;
if (NewLines == 0)
Comments.back().MinColumn = WhitespaceStartColumn + Spaces;
else
Comments.back().MinColumn = Spaces;
Comments.back().MaxColumn =
Style.ColumnLimit - Tok.FormatTok.TokenLength;
return;
}
}
// If this line does not have a trailing comment, align the stored comments.
if (Tok.Children.empty() && !isTrailingComment(Tok))
alignComments();
storeReplacement(Tok.FormatTok, getNewLineText(NewLines, Spaces));
}
/// \brief Like \c replaceWhitespace, but additionally adds right-aligned
/// backslashes to escape newlines inside a preprocessor directive.
///
/// This function and \c replaceWhitespace have the same behavior if
/// \c Newlines == 0.
void replacePPWhitespace(const AnnotatedToken &Tok, unsigned NewLines,
unsigned Spaces, unsigned WhitespaceStartColumn,
const FormatStyle &Style) {
storeReplacement(
Tok.FormatTok,
getNewLineText(NewLines, Spaces, WhitespaceStartColumn, Style));
}
/// \brief Inserts a line break into the middle of a token.
///
/// Will break at \p Offset inside \p Tok, putting \p Prefix before the line
/// break and \p Postfix before the rest of the token starts in the next line.
///
/// \p InPPDirective, \p Spaces, \p WhitespaceStartColumn and \p Style are
/// used to generate the correct line break.
void breakToken(const AnnotatedToken &Tok, unsigned Offset, StringRef Prefix,
StringRef Postfix, bool InPPDirective, unsigned Spaces,
unsigned WhitespaceStartColumn, const FormatStyle &Style) {
std::string NewLineText;
if (!InPPDirective)
NewLineText = getNewLineText(1, Spaces);
else
NewLineText = getNewLineText(1, Spaces, WhitespaceStartColumn, Style);
std::string ReplacementText = (Prefix + NewLineText + Postfix).str();
SourceLocation InsertAt = Tok.FormatTok.WhiteSpaceStart
.getLocWithOffset(Tok.FormatTok.WhiteSpaceLength + Offset);
Replaces.insert(
tooling::Replacement(SourceMgr, InsertAt, 0, ReplacementText));
}
/// \brief Returns all the \c Replacements created during formatting.
const tooling::Replacements &generateReplacements() {
alignComments();
return Replaces;
}
private:
std::string getNewLineText(unsigned NewLines, unsigned Spaces) {
return std::string(NewLines, '\n') + std::string(Spaces, ' ');
}
std::string
getNewLineText(unsigned NewLines, unsigned Spaces,
unsigned WhitespaceStartColumn, const FormatStyle &Style) {
std::string NewLineText;
if (NewLines > 0) {
unsigned Offset =
std::min<int>(Style.ColumnLimit - 1, WhitespaceStartColumn);
for (unsigned i = 0; i < NewLines; ++i) {
NewLineText += std::string(Style.ColumnLimit - Offset - 1, ' ');
NewLineText += "\\\n";
Offset = 0;
}
}
return NewLineText + std::string(Spaces, ' ');
}
/// \brief Structure to store a comment for later layout and alignment.
struct StoredComment {
FormatToken Tok;
unsigned MinColumn;
unsigned MaxColumn;
unsigned NewLines;
unsigned Spaces;
};
SmallVector<StoredComment, 16> Comments;
typedef SmallVector<StoredComment, 16>::iterator comment_iterator;
/// \brief Try to align all stashed comments.
void alignComments() {
unsigned MinColumn = 0;
unsigned MaxColumn = UINT_MAX;
comment_iterator Start = Comments.begin();
for (comment_iterator I = Comments.begin(), E = Comments.end(); I != E;
++I) {
if (I->MinColumn > MaxColumn || I->MaxColumn < MinColumn) {
alignComments(Start, I, MinColumn);
MinColumn = I->MinColumn;
MaxColumn = I->MaxColumn;
Start = I;
} else {
MinColumn = std::max(MinColumn, I->MinColumn);
MaxColumn = std::min(MaxColumn, I->MaxColumn);
}
}
alignComments(Start, Comments.end(), MinColumn);
Comments.clear();
}
/// \brief Put all the comments between \p I and \p E into \p Column.
void alignComments(comment_iterator I, comment_iterator E, unsigned Column) {
while (I != E) {
unsigned Spaces = I->Spaces + Column - I->MinColumn;
storeReplacement(I->Tok, std::string(I->NewLines, '\n') +
std::string(Spaces, ' '));
++I;
}
}
/// \brief Stores \p Text as the replacement for the whitespace in front of
/// \p Tok.
void storeReplacement(const FormatToken &Tok, const std::string Text) {
// Don't create a replacement, if it does not change anything.
if (StringRef(SourceMgr.getCharacterData(Tok.WhiteSpaceStart),
Tok.WhiteSpaceLength) == Text)
return;
Replaces.insert(tooling::Replacement(SourceMgr, Tok.WhiteSpaceStart,
Tok.WhiteSpaceLength, Text));
}
SourceManager &SourceMgr;
tooling::Replacements Replaces;
};
class UnwrappedLineFormatter {
public:
UnwrappedLineFormatter(const FormatStyle &Style, SourceManager &SourceMgr,
const AnnotatedLine &Line, unsigned FirstIndent,
const AnnotatedToken &RootToken,
WhitespaceManager &Whitespaces, bool StructuralError)
: Style(Style), SourceMgr(SourceMgr), Line(Line),
FirstIndent(FirstIndent), RootToken(RootToken),
Whitespaces(Whitespaces), Count(0) {}
/// \brief Formats an \c UnwrappedLine.
///
/// \returns The column after the last token in the last line of the
/// \c UnwrappedLine.
unsigned format() {
// Initialize state dependent on indent.
LineState State;
State.Column = FirstIndent;
State.NextToken = &RootToken;
State.Stack.push_back(ParenState(FirstIndent + 4, FirstIndent,
!Style.BinPackParameters,
/*HasMultiParameterLine=*/ false));
State.VariablePos = 0;
State.LineContainsContinuedForLoopSection = false;
State.ParenLevel = 0;
State.StartOfStringLiteral = 0;
State.StartOfLineLevel = State.ParenLevel;
DEBUG({
DebugTokenState(*State.NextToken);
});
// The first token has already been indented and thus consumed.
moveStateToNextToken(State, /*DryRun=*/ false);
// If everything fits on a single line, just put it there.
if (Line.Last->TotalLength <= getColumnLimit() - FirstIndent) {
while (State.NextToken != NULL) {
addTokenToState(false, false, State);
}
return State.Column;
}
// If the ObjC method declaration does not fit on a line, we should format
// it with one arg per line.
if (Line.Type == LT_ObjCMethodDecl)
State.Stack.back().BreakBeforeParameter = true;
// Find best solution in solution space.
return analyzeSolutionSpace(State);
}
private:
void DebugTokenState(const AnnotatedToken &AnnotatedTok) {
const Token &Tok = AnnotatedTok.FormatTok.Tok;
llvm::errs() << StringRef(SourceMgr.getCharacterData(Tok.getLocation()),
Tok.getLength());
llvm::errs();
}
struct ParenState {
ParenState(unsigned Indent, unsigned LastSpace, bool AvoidBinPacking,
bool HasMultiParameterLine)
: Indent(Indent), LastSpace(LastSpace), FirstLessLess(0),
BreakBeforeClosingBrace(false), QuestionColumn(0),
AvoidBinPacking(AvoidBinPacking), BreakBeforeParameter(false),
HasMultiParameterLine(HasMultiParameterLine), ColonPos(0) {}
/// \brief The position to which a specific parenthesis level needs to be
/// indented.
unsigned Indent;
/// \brief The position of the last space on each level.
///
/// Used e.g. to break like:
/// functionCall(Parameter, otherCall(
/// OtherParameter));
unsigned LastSpace;
/// \brief The position the first "<<" operator encountered on each level.
///
/// Used to align "<<" operators. 0 if no such operator has been encountered
/// on a level.
unsigned FirstLessLess;
/// \brief Whether a newline needs to be inserted before the block's closing
/// brace.
///
/// We only want to insert a newline before the closing brace if there also
/// was a newline after the beginning left brace.
bool BreakBeforeClosingBrace;
/// \brief The column of a \c ? in a conditional expression;
unsigned QuestionColumn;
/// \brief Avoid bin packing, i.e. multiple parameters/elements on multiple
/// lines, in this context.
bool AvoidBinPacking;
/// \brief Break after the next comma (or all the commas in this context if
/// \c AvoidBinPacking is \c true).
bool BreakBeforeParameter;
/// \brief This context already has a line with more than one parameter.
bool HasMultiParameterLine;
/// \brief The position of the colon in an ObjC method declaration/call.
unsigned ColonPos;
bool operator<(const ParenState &Other) const {
if (Indent != Other.Indent)
return Indent < Other.Indent;
if (LastSpace != Other.LastSpace)
return LastSpace < Other.LastSpace;
if (FirstLessLess != Other.FirstLessLess)
return FirstLessLess < Other.FirstLessLess;
if (BreakBeforeClosingBrace != Other.BreakBeforeClosingBrace)
return BreakBeforeClosingBrace;
if (QuestionColumn != Other.QuestionColumn)
return QuestionColumn < Other.QuestionColumn;
if (AvoidBinPacking != Other.AvoidBinPacking)
return AvoidBinPacking;
if (BreakBeforeParameter != Other.BreakBeforeParameter)
return BreakBeforeParameter;
if (HasMultiParameterLine != Other.HasMultiParameterLine)
return HasMultiParameterLine;
if (ColonPos != Other.ColonPos)
return ColonPos < Other.ColonPos;
return false;
}
};
/// \brief The current state when indenting a unwrapped line.
///
/// As the indenting tries different combinations this is copied by value.
struct LineState {
/// \brief The number of used columns in the current line.
unsigned Column;
/// \brief The token that needs to be next formatted.
const AnnotatedToken *NextToken;
/// \brief The column of the first variable name in a variable declaration.
///
/// Used to align further variables if necessary.
unsigned VariablePos;
/// \brief \c true if this line contains a continued for-loop section.
bool LineContainsContinuedForLoopSection;
/// \brief The level of nesting inside (), [], <> and {}.
unsigned ParenLevel;
/// \brief The \c ParenLevel at the start of this line.
unsigned StartOfLineLevel;
/// \brief The start column of the string literal, if we're in a string
/// literal sequence, 0 otherwise.
unsigned StartOfStringLiteral;
/// \brief A stack keeping track of properties applying to parenthesis
/// levels.
std::vector<ParenState> Stack;
/// \brief Comparison operator to be able to used \c LineState in \c map.
bool operator<(const LineState &Other) const {
if (NextToken != Other.NextToken)
return NextToken < Other.NextToken;
if (Column != Other.Column)
return Column < Other.Column;
if (VariablePos != Other.VariablePos)
return VariablePos < Other.VariablePos;
if (LineContainsContinuedForLoopSection !=
Other.LineContainsContinuedForLoopSection)
return LineContainsContinuedForLoopSection;
if (ParenLevel != Other.ParenLevel)
return ParenLevel < Other.ParenLevel;
if (StartOfLineLevel != Other.StartOfLineLevel)
return StartOfLineLevel < Other.StartOfLineLevel;
if (StartOfStringLiteral != Other.StartOfStringLiteral)
return StartOfStringLiteral < Other.StartOfStringLiteral;
return Stack < Other.Stack;
}
};
/// \brief Appends the next token to \p State and updates information
/// necessary for indentation.
///
/// Puts the token on the current line if \p Newline is \c true and adds a
/// line break and necessary indentation otherwise.
///
/// If \p DryRun is \c false, also creates and stores the required
/// \c Replacement.
unsigned addTokenToState(bool Newline, bool DryRun, LineState &State) {
const AnnotatedToken &Current = *State.NextToken;
const AnnotatedToken &Previous = *State.NextToken->Parent;
assert(State.Stack.size());
if (Current.Type == TT_ImplicitStringLiteral) {
State.Column += State.NextToken->FormatTok.WhiteSpaceLength +
State.NextToken->FormatTok.TokenLength;
if (State.NextToken->Children.empty())
State.NextToken = NULL;
else
State.NextToken = &State.NextToken->Children[0];
return 0;
}
if (Newline) {
unsigned WhitespaceStartColumn = State.Column;
if (Current.is(tok::r_brace)) {
State.Column = Line.Level * 2;
} 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 (State.ParenLevel != 0 &&
(Previous.is(tok::equal) || Previous.is(tok::coloncolon) ||
Current.is(tok::period) || Current.is(tok::arrow) ||
Current.is(tok::question))) {
// Indent and extra 4 spaces after if we know the current expression is
// continued. Don't do that on the top level, as we already indent 4
// there.
State.Column = std::max(State.Stack.back().LastSpace,
State.Stack.back().Indent) + 4;
} else if (Current.Type == TT_ConditionalExpr) {
State.Column = State.Stack.back().QuestionColumn;
} else if (Previous.is(tok::comma) && State.VariablePos != 0 &&
((RootToken.is(tok::kw_for) && State.ParenLevel == 1) ||
State.ParenLevel == 0)) {
State.Column = State.VariablePos;
} else if (Previous.ClosesTemplateDeclaration ||
(Current.Type == TT_StartOfName && State.ParenLevel == 0)) {
State.Column = State.Stack.back().Indent - 4;
} else if (Current.Type == TT_ObjCSelectorName) {
if (State.Stack.back().ColonPos > Current.FormatTok.TokenLength) {
State.Column =
State.Stack.back().ColonPos - Current.FormatTok.TokenLength;
} else {
State.Column = State.Stack.back().Indent;
State.Stack.back().ColonPos =
State.Column + Current.FormatTok.TokenLength;
}
} else if (Previous.Type == TT_ObjCMethodExpr ||
Current.Type == TT_StartOfName) {
State.Column = State.Stack.back().Indent + 4;
} else {
State.Column = State.Stack.back().Indent;
}
if (Current.is(tok::question))
State.Stack.back().BreakBeforeParameter = true;
if ((Previous.is(tok::comma) || Previous.is(tok::semi)) &&
!State.Stack.back().AvoidBinPacking)
State.Stack.back().BreakBeforeParameter = false;
if (!DryRun) {
unsigned NewLines = 1;
if (Current.Type == TT_LineComment)
NewLines =
std::max(NewLines, std::min(Current.FormatTok.NewlinesBefore,
Style.MaxEmptyLinesToKeep + 1));
if (!Line.InPPDirective)
Whitespaces.replaceWhitespace(Current, NewLines, State.Column,
WhitespaceStartColumn, Style);
else
Whitespaces.replacePPWhitespace(Current, NewLines, State.Column,
WhitespaceStartColumn, Style);
}
State.Stack.back().LastSpace = State.Column;
State.StartOfLineLevel = State.ParenLevel;
if (Current.is(tok::colon) && Current.Type != TT_ConditionalExpr)
State.Stack.back().Indent += 2;
// Any break on this level means that the parent level has been broken
// and we need to avoid bin packing there.
for (unsigned i = 0, e = State.Stack.size() - 1; i != e; ++i) {
State.Stack[i].BreakBeforeParameter = true;
}
// If we break after {, we should also break before the corresponding }.
if (Previous.is(tok::l_brace))
State.Stack.back().BreakBeforeClosingBrace = true;
if (State.Stack.back().AvoidBinPacking) {
// If we are breaking after '(', '{', '<', this is not bin packing
// unless AllowAllParametersOfDeclarationOnNextLine is false.
if ((Previous.isNot(tok::l_paren) && Previous.isNot(tok::l_brace)) ||
(!Style.AllowAllParametersOfDeclarationOnNextLine &&
Line.MustBeDeclaration))
State.Stack.back().BreakBeforeParameter = true;
}
} else {
// FIXME: Put VariablePos into ParenState and remove second part of if().
if (Current.is(tok::equal) &&
(RootToken.is(tok::kw_for) || State.ParenLevel == 0))
State.VariablePos = State.Column - Previous.FormatTok.TokenLength;
unsigned Spaces = State.NextToken->SpacesRequiredBefore;
if (!DryRun)
Whitespaces.replaceWhitespace(Current, 0, Spaces, State.Column, Style);
if (Current.Type == TT_ObjCSelectorName &&
State.Stack.back().ColonPos == 0) {
if (State.Stack.back().Indent + Current.LongestObjCSelectorName >
State.Column + Spaces + Current.FormatTok.TokenLength)
State.Stack.back().ColonPos =
State.Stack.back().Indent + Current.LongestObjCSelectorName;
else
State.Stack.back().ColonPos =
State.Column + Spaces + Current.FormatTok.TokenLength;
}
if (Current.Type != TT_LineComment &&
(Previous.is(tok::l_paren) || Previous.is(tok::l_brace) ||
State.NextToken->Parent->Type == TT_TemplateOpener))
State.Stack.back().Indent = State.Column + Spaces;
if (Previous.is(tok::comma) && !isTrailingComment(Current))
State.Stack.back().HasMultiParameterLine = true;
State.Column += Spaces;
if (Current.is(tok::l_paren) && Previous.is(tok::kw_if))
// Treat the condition inside an if as if it was a second function
// parameter, i.e. let nested calls have an indent of 4.
State.Stack.back().LastSpace = State.Column + 1; // 1 is length of "(".
else if (Previous.is(tok::comma) && State.ParenLevel != 0)
// Top-level spaces are exempt as that mostly leads to better results.
State.Stack.back().LastSpace = State.Column;
else if ((Previous.Type == TT_BinaryOperator ||
Previous.Type == TT_ConditionalExpr ||
Previous.Type == TT_CtorInitializerColon) &&
getPrecedence(Previous) != prec::Assignment)
State.Stack.back().LastSpace = State.Column;
else if (Previous.Type == TT_InheritanceColon)
State.Stack.back().Indent = State.Column;
else if (Previous.ParameterCount > 1 &&
(Previous.is(tok::l_paren) || Previous.is(tok::l_square) ||
Previous.is(tok::l_brace) ||
Previous.Type == TT_TemplateOpener))
// If this function has multiple parameters, indent nested calls from
// the start of the first parameter.
State.Stack.back().LastSpace = State.Column;
else if ((Current.is(tok::period) || Current.is(tok::arrow)) &&
Line.Type == LT_BuilderTypeCall && State.ParenLevel == 0)
State.Stack.back().LastSpace = State.Column;
}
return moveStateToNextToken(State, DryRun);
}
/// \brief Mark the next token as consumed in \p State and modify its stacks
/// accordingly.
unsigned moveStateToNextToken(LineState &State, bool DryRun) {
const AnnotatedToken &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.is(tok::question))
State.Stack.back().QuestionColumn = State.Column;
if (Current.Type == TT_CtorInitializerColon) {
if (Style.ConstructorInitializerAllOnOneLineOrOnePerLine)
State.Stack.back().AvoidBinPacking = true;
State.Stack.back().BreakBeforeParameter = false;
}
// Insert scopes created by fake parenthesis.
for (unsigned i = 0, e = Current.FakeLParens; i != e; ++i) {
ParenState NewParenState = State.Stack.back();
NewParenState.Indent = std::max(State.Column, State.Stack.back().Indent);
NewParenState.BreakBeforeParameter = false;
State.Stack.push_back(NewParenState);
}
// If we encounter an opening (, [, { or <, we add a level to our stacks to
// prepare for the following tokens.
if (Current.is(tok::l_paren) || Current.is(tok::l_square) ||
Current.is(tok::l_brace) ||
State.NextToken->Type == TT_TemplateOpener) {
unsigned NewIndent;
bool AvoidBinPacking;
if (Current.is(tok::l_brace)) {
NewIndent = 2 + State.Stack.back().LastSpace;
AvoidBinPacking = false;
} else {
NewIndent = 4 + State.Stack.back().LastSpace;
AvoidBinPacking = !Style.BinPackParameters;
}
State.Stack.push_back(
ParenState(NewIndent, State.Stack.back().LastSpace, AvoidBinPacking,
State.Stack.back().HasMultiParameterLine));
++State.ParenLevel;
}
// If this '[' opens an ObjC call, determine whether all parameters fit into
// one line and put one per line if they don't.
if (Current.is(tok::l_square) && Current.Type == TT_ObjCMethodExpr &&
Current.MatchingParen != NULL) {
if (getLengthToMatchingParen(Current) + State.Column > getColumnLimit())
State.Stack.back().BreakBeforeParameter = true;
}
// If we encounter a closing ), ], } or >, we can remove a level from our
// stacks.
if (Current.is(tok::r_paren) || Current.is(tok::r_square) ||
(Current.is(tok::r_brace) && State.NextToken != &RootToken) ||
State.NextToken->Type == TT_TemplateCloser) {
State.Stack.pop_back();
--State.ParenLevel;
}
// Remove scopes created by fake parenthesis.
for (unsigned i = 0, e = Current.FakeRParens; i != e; ++i) {
State.Stack.pop_back();
}
if (Current.is(tok::string_literal)) {
State.StartOfStringLiteral = State.Column;
} else if (Current.isNot(tok::comment)) {
State.StartOfStringLiteral = 0;
}
State.Column += Current.FormatTok.TokenLength;
if (State.NextToken->Children.empty())
State.NextToken = NULL;
else
State.NextToken = &State.NextToken->Children[0];
return breakProtrudingToken(Current, State, DryRun);
}
/// \brief If the current token sticks out over the end of the line, break
/// it if possible.
unsigned breakProtrudingToken(const AnnotatedToken &Current, LineState &State,
bool DryRun) {
if (Current.isNot(tok::string_literal))
return 0;
unsigned Penalty = 0;
unsigned TailOffset = 0;
unsigned TailLength = Current.FormatTok.TokenLength;
unsigned StartColumn = State.Column - Current.FormatTok.TokenLength;
unsigned OffsetFromStart = 0;
while (StartColumn + TailLength > getColumnLimit()) {
StringRef Text = StringRef(Current.FormatTok.Tok.getLiteralData() +
TailOffset, TailLength);
StringRef::size_type SplitPoint =
getSplitPoint(Text, getColumnLimit() - StartColumn - 1);
if (SplitPoint == StringRef::npos)
break;
assert(SplitPoint != 0);
// +2, because 'Text' starts after the opening quotes, and does not
// include the closing quote we need to insert.
unsigned WhitespaceStartColumn =
StartColumn + OffsetFromStart + SplitPoint + 2;
State.Stack.back().LastSpace = StartColumn;
if (!DryRun) {
Whitespaces.breakToken(Current, TailOffset + SplitPoint + 1, "\"", "\"",
Line.InPPDirective, StartColumn,
WhitespaceStartColumn, Style);
}
TailOffset += SplitPoint + 1;
TailLength -= SplitPoint + 1;
OffsetFromStart = 1;
Penalty += Style.PenaltyExcessCharacter;
}
State.Column = StartColumn + TailLength;
return Penalty;
}
StringRef::size_type
getSplitPoint(StringRef Text, StringRef::size_type Offset) {
// FIXME: Implement more sophisticated splitting mechanism, and a fallback.
return Text.rfind(' ', Offset);
}
unsigned getColumnLimit() {
return Style.ColumnLimit - (Line.InPPDirective ? 1 : 0);
}
/// \brief An edge in the solution space from \c Previous->State to \c State,
/// inserting a newline dependent on the \c NewLine.
struct StateNode {
StateNode(const LineState &State, bool NewLine, StateNode *Previous)
: State(State), NewLine(NewLine), Previous(Previous) {}
LineState State;
bool NewLine;
StateNode *Previous;
};
/// \brief A pair of <penalty, count> that is used to prioritize the BFS on.
///
/// In case of equal penalties, we want to prefer states that were inserted
/// first. During state generation we make sure that we insert states first
/// that break the line as late as possible.
typedef std::pair<unsigned, unsigned> OrderedPenalty;
/// \brief An item in the prioritized BFS search queue. The \c StateNode's
/// \c State has the given \c OrderedPenalty.
typedef std::pair<OrderedPenalty, StateNode *> QueueItem;
/// \brief The BFS queue type.
typedef std::priority_queue<QueueItem, std::vector<QueueItem>,
std::greater<QueueItem> > QueueType;
/// \brief Analyze the entire solution space starting from \p InitialState.
///
/// This implements a variant of Dijkstra's algorithm on the graph that spans
/// the solution space (\c LineStates are the nodes). The algorithm tries to
/// find the shortest path (the one with lowest penalty) from \p InitialState
/// to a state where all tokens are placed.
unsigned analyzeSolutionSpace(LineState &InitialState) {
std::set<LineState> Seen;
// Insert start element into queue.
StateNode *Node =
new (Allocator.Allocate()) StateNode(InitialState, false, NULL);
Queue.push(QueueItem(OrderedPenalty(0, Count), Node));
++Count;
// While not empty, take first element and follow edges.
while (!Queue.empty()) {
unsigned Penalty = Queue.top().first.first;
StateNode *Node = Queue.top().second;
if (Node->State.NextToken == NULL) {
DEBUG(llvm::errs() << "\n---\nPenalty for line: " << Penalty << "\n");
break;
}
Queue.pop();
if (!Seen.insert(Node->State).second)
// State already examined with lower penalty.
continue;
addNextStateToQueue(Penalty, Node, /*NewLine=*/ false);
addNextStateToQueue(Penalty, Node, /*NewLine=*/ true);
}
if (Queue.empty())
// We were unable to find a solution, do nothing.
// FIXME: Add diagnostic?
return 0;
// Reconstruct the solution.
reconstructPath(InitialState, Queue.top().second);
DEBUG(llvm::errs() << "---\n");
// Return the column after the last token of the solution.
return Queue.top().second->State.Column;
}
void reconstructPath(LineState &State, StateNode *Current) {
// FIXME: This recursive implementation limits the possible number
// of tokens per line if compiled into a binary with small stack space.
// To become more independent of stack frame limitations we would need
// to also change the TokenAnnotator.
if (Current->Previous == NULL)
return;
reconstructPath(State, Current->Previous);
DEBUG({
if (Current->NewLine) {
llvm::errs()
<< "Penalty for splitting before "
<< Current->Previous->State.NextToken->FormatTok.Tok.getName()
<< ": " << Current->Previous->State.NextToken->SplitPenalty << "\n";
}
});
addTokenToState(Current->NewLine, false, State);
}
/// \brief Add the following state to the analysis queue \c Queue.
///
/// Assume the current state is \p PreviousNode and has been reached with a
/// penalty of \p Penalty. Insert a line break if \p NewLine is \c true.
void addNextStateToQueue(unsigned Penalty, StateNode *PreviousNode,
bool NewLine) {
if (NewLine && !canBreak(PreviousNode->State))
return;
if (!NewLine && mustBreak(PreviousNode->State))
return;
if (NewLine)
Penalty += PreviousNode->State.NextToken->SplitPenalty;
StateNode *Node = new (Allocator.Allocate())
StateNode(PreviousNode->State, NewLine, PreviousNode);
Penalty += addTokenToState(NewLine, true, Node->State);
if (Node->State.Column > getColumnLimit()) {
unsigned ExcessCharacters = Node->State.Column - getColumnLimit();
Penalty += Style.PenaltyExcessCharacter * ExcessCharacters;
}
Queue.push(QueueItem(OrderedPenalty(Penalty, Count), Node));
++Count;
}
/// \brief Returns \c true, if a line break after \p State is allowed.
bool canBreak(const LineState &State) {
if (!State.NextToken->CanBreakBefore &&
!(State.NextToken->is(tok::r_brace) &&
State.Stack.back().BreakBeforeClosingBrace))
return false;
// This prevents breaks like:
// ...
// SomeParameter, OtherParameter).DoSomething(
// ...
// As they hide "DoSomething" and generally bad for readability.
if (State.NextToken->Parent->is(tok::l_paren) &&
State.ParenLevel <= State.StartOfLineLevel)
return false;
// Trying to insert a parameter on a new line if there are already more than
// one parameter on the current line is bin packing.
if (State.Stack.back().HasMultiParameterLine &&
State.Stack.back().AvoidBinPacking)
return false;
return true;
}
/// \brief Returns \c true, if a line break after \p State is mandatory.
bool mustBreak(const LineState &State) {
if (State.NextToken->MustBreakBefore)
return true;
if (State.NextToken->is(tok::r_brace) &&
State.Stack.back().BreakBeforeClosingBrace)
return true;
if (State.NextToken->Parent->is(tok::semi) &&
State.LineContainsContinuedForLoopSection)
return true;
if ((State.NextToken->Parent->is(tok::comma) ||
State.NextToken->Parent->is(tok::semi) ||
State.NextToken->is(tok::question) ||
State.NextToken->Type == TT_ConditionalExpr) &&
State.Stack.back().BreakBeforeParameter &&
!isTrailingComment(*State.NextToken) &&
State.NextToken->isNot(tok::r_paren) &&
State.NextToken->isNot(tok::r_brace))
return true;
// FIXME: Comparing LongestObjCSelectorName to 0 is a hacky way of finding
// out whether it is the first parameter. Clean this up.
if (State.NextToken->Type == TT_ObjCSelectorName &&
State.NextToken->LongestObjCSelectorName == 0 &&
State.Stack.back().BreakBeforeParameter)
return true;
if ((State.NextToken->Type == TT_CtorInitializerColon ||
(State.NextToken->Parent->ClosesTemplateDeclaration &&
State.ParenLevel == 0)))
return true;
return false;
}
FormatStyle Style;
SourceManager &SourceMgr;
const AnnotatedLine &Line;
const unsigned FirstIndent;
const AnnotatedToken &RootToken;
WhitespaceManager &Whitespaces;
llvm::SpecificBumpPtrAllocator<StateNode> Allocator;
QueueType Queue;
// Increasing count of \c StateNode items we have created. This is used
// to create a deterministic order independent of the container.
unsigned Count;
};
class LexerBasedFormatTokenSource : public FormatTokenSource {
public:
LexerBasedFormatTokenSource(Lexer &Lex, SourceManager &SourceMgr)
: GreaterStashed(false), Lex(Lex), SourceMgr(SourceMgr),
IdentTable(Lex.getLangOpts()) {
Lex.SetKeepWhitespaceMode(true);
}
virtual FormatToken getNextToken() {
if (GreaterStashed) {
FormatTok.NewlinesBefore = 0;
FormatTok.WhiteSpaceStart =
FormatTok.Tok.getLocation().getLocWithOffset(1);
FormatTok.WhiteSpaceLength = 0;
GreaterStashed = false;
return FormatTok;
}
FormatTok = FormatToken();
Lex.LexFromRawLexer(FormatTok.Tok);
StringRef Text = rawTokenText(FormatTok.Tok);
FormatTok.WhiteSpaceStart = FormatTok.Tok.getLocation();
if (SourceMgr.getFileOffset(FormatTok.WhiteSpaceStart) == 0)
FormatTok.IsFirst = true;
// Consume and record whitespace until we find a significant token.
while (FormatTok.Tok.is(tok::unknown)) {
unsigned Newlines = Text.count('\n');
unsigned EscapedNewlines = Text.count("\\\n");
FormatTok.NewlinesBefore += Newlines;
FormatTok.HasUnescapedNewline |= EscapedNewlines != Newlines;
FormatTok.WhiteSpaceLength += FormatTok.Tok.getLength();
if (FormatTok.Tok.is(tok::eof))
return FormatTok;
Lex.LexFromRawLexer(FormatTok.Tok);
Text = rawTokenText(FormatTok.Tok);
}
// Now FormatTok is the next non-whitespace token.
FormatTok.TokenLength = Text.size();
// In case the token starts with escaped newlines, we want to
// take them into account as whitespace - this pattern is quite frequent
// in macro definitions.
// FIXME: What do we want to do with other escaped spaces, and escaped
// spaces or newlines in the middle of tokens?
// FIXME: Add a more explicit test.
unsigned i = 0;
while (i + 1 < Text.size() && Text[i] == '\\' && Text[i + 1] == '\n') {
// FIXME: ++FormatTok.NewlinesBefore is missing...
FormatTok.WhiteSpaceLength += 2;
FormatTok.TokenLength -= 2;
i += 2;
}
if (FormatTok.Tok.is(tok::raw_identifier)) {
IdentifierInfo &Info = IdentTable.get(Text);
FormatTok.Tok.setIdentifierInfo(&Info);
FormatTok.Tok.setKind(Info.getTokenID());
}
if (FormatTok.Tok.is(tok::greatergreater)) {
FormatTok.Tok.setKind(tok::greater);
GreaterStashed = true;
}
return FormatTok;
}
IdentifierTable &getIdentTable() { return IdentTable; }
private:
FormatToken FormatTok;
bool GreaterStashed;
Lexer &Lex;
SourceManager &SourceMgr;
IdentifierTable IdentTable;
/// Returns the text of \c FormatTok.
StringRef rawTokenText(Token &Tok) {
return StringRef(SourceMgr.getCharacterData(Tok.getLocation()),
Tok.getLength());
}
};
class Formatter : public UnwrappedLineConsumer {
public:
Formatter(DiagnosticsEngine &Diag, const FormatStyle &Style, Lexer &Lex,
SourceManager &SourceMgr,
const std::vector<CharSourceRange> &Ranges)
: Diag(Diag), Style(Style), Lex(Lex), SourceMgr(SourceMgr),
Whitespaces(SourceMgr), Ranges(Ranges) {}
virtual ~Formatter() {}
void deriveLocalStyle() {
unsigned CountBoundToVariable = 0;
unsigned CountBoundToType = 0;
bool HasCpp03IncompatibleFormat = false;
for (unsigned i = 0, e = AnnotatedLines.size(); i != e; ++i) {
if (AnnotatedLines[i].First.Children.empty())
continue;
AnnotatedToken *Tok = &AnnotatedLines[i].First.Children[0];
while (!Tok->Children.empty()) {
if (Tok->Type == TT_PointerOrReference) {
bool SpacesBefore = Tok->FormatTok.WhiteSpaceLength > 0;
bool SpacesAfter = Tok->Children[0].FormatTok.WhiteSpaceLength > 0;
if (SpacesBefore && !SpacesAfter)
++CountBoundToVariable;
else if (!SpacesBefore && SpacesAfter)
++CountBoundToType;
}
if (Tok->Type == TT_TemplateCloser &&
Tok->Parent->Type == TT_TemplateCloser &&
Tok->FormatTok.WhiteSpaceLength == 0)
HasCpp03IncompatibleFormat = true;
Tok = &Tok->Children[0];
}
}
if (Style.DerivePointerBinding) {
if (CountBoundToType > CountBoundToVariable)
Style.PointerBindsToType = true;
else if (CountBoundToType < CountBoundToVariable)
Style.PointerBindsToType = false;
}
if (Style.Standard == FormatStyle::LS_Auto) {
Style.Standard = HasCpp03IncompatibleFormat ? FormatStyle::LS_Cpp11
: FormatStyle::LS_Cpp03;
}
}
tooling::Replacements format() {
LexerBasedFormatTokenSource Tokens(Lex, SourceMgr);
UnwrappedLineParser Parser(Diag, Style, Tokens, *this);
StructuralError = Parser.parse();
unsigned PreviousEndOfLineColumn = 0;
TokenAnnotator Annotator(Style, SourceMgr, Lex,
Tokens.getIdentTable().get("in"));
for (unsigned i = 0, e = AnnotatedLines.size(); i != e; ++i) {
Annotator.annotate(AnnotatedLines[i]);
}
deriveLocalStyle();
for (unsigned i = 0, e = AnnotatedLines.size(); i != e; ++i) {
Annotator.calculateFormattingInformation(AnnotatedLines[i]);
}
std::vector<int> IndentForLevel;
bool PreviousLineWasTouched = false;
for (std::vector<AnnotatedLine>::iterator I = AnnotatedLines.begin(),
E = AnnotatedLines.end();
I != E; ++I) {
const AnnotatedLine &TheLine = *I;
int Offset = getIndentOffset(TheLine.First);
while (IndentForLevel.size() <= TheLine.Level)
IndentForLevel.push_back(-1);
IndentForLevel.resize(TheLine.Level + 1);
bool WasMoved =
PreviousLineWasTouched && TheLine.First.FormatTok.NewlinesBefore == 0;
if (TheLine.Type != LT_Invalid && (WasMoved || touchesRanges(TheLine))) {
unsigned LevelIndent = getIndent(IndentForLevel, TheLine.Level);
unsigned Indent = LevelIndent;
if (static_cast<int>(Indent) + Offset >= 0)
Indent += Offset;
if (!TheLine.First.FormatTok.WhiteSpaceStart.isValid() ||
StructuralError) {
Indent = LevelIndent = SourceMgr.getSpellingColumnNumber(
TheLine.First.FormatTok.Tok.getLocation()) - 1;
} else {
formatFirstToken(TheLine.First, Indent, TheLine.InPPDirective,
PreviousEndOfLineColumn);
}
tryFitMultipleLinesInOne(Indent, I, E);
UnwrappedLineFormatter Formatter(Style, SourceMgr, TheLine, Indent,
TheLine.First, Whitespaces,
StructuralError);
PreviousEndOfLineColumn = Formatter.format();
IndentForLevel[TheLine.Level] = LevelIndent;
PreviousLineWasTouched = true;
} else {
if (TheLine.First.FormatTok.NewlinesBefore > 0 ||
TheLine.First.FormatTok.IsFirst) {
unsigned Indent = SourceMgr.getSpellingColumnNumber(
TheLine.First.FormatTok.Tok.getLocation()) - 1;
unsigned LevelIndent = Indent;
if (static_cast<int>(LevelIndent) - Offset >= 0)
LevelIndent -= Offset;
IndentForLevel[TheLine.Level] = LevelIndent;
// Remove trailing whitespace of the previous line if it was touched.
if (PreviousLineWasTouched)
formatFirstToken(TheLine.First, Indent, TheLine.InPPDirective,
PreviousEndOfLineColumn);
}
// If we did not reformat this unwrapped line, the column at the end of
// the last token is unchanged - thus, we can calculate the end of the
// last token.
PreviousEndOfLineColumn =
SourceMgr.getSpellingColumnNumber(
TheLine.Last->FormatTok.Tok.getLocation()) +
Lex.MeasureTokenLength(TheLine.Last->FormatTok.Tok.getLocation(),
SourceMgr, Lex.getLangOpts()) - 1;
PreviousLineWasTouched = false;
}
}
return Whitespaces.generateReplacements();
}
private:
/// \brief Get the indent of \p Level from \p IndentForLevel.
///
/// \p IndentForLevel must contain the indent for the level \c l
/// at \p IndentForLevel[l], or a value < 0 if the indent for
/// that level is unknown.
unsigned getIndent(const std::vector<int> IndentForLevel, unsigned Level) {
if (IndentForLevel[Level] != -1)
return IndentForLevel[Level];
if (Level == 0)
return 0;
return getIndent(IndentForLevel, Level - 1) + 2;
}
/// \brief Get the offset of the line relatively to the level.
///
/// For example, 'public:' labels in classes are offset by 1 or 2
/// characters to the left from their level.
int getIndentOffset(const AnnotatedToken &RootToken) {
bool IsAccessModifier = false;
if (RootToken.is(tok::kw_public) || RootToken.is(tok::kw_protected) ||
RootToken.is(tok::kw_private))
IsAccessModifier = true;
else if (RootToken.is(tok::at) && !RootToken.Children.empty() &&
(RootToken.Children[0].isObjCAtKeyword(tok::objc_public) ||
RootToken.Children[0].isObjCAtKeyword(tok::objc_protected) ||
RootToken.Children[0].isObjCAtKeyword(tok::objc_package) ||
RootToken.Children[0].isObjCAtKeyword(tok::objc_private)))
IsAccessModifier = true;
if (IsAccessModifier)
return Style.AccessModifierOffset;
return 0;
}
/// \brief Tries to merge lines into one.
///
/// This will change \c Line and \c AnnotatedLine to contain the merged line,
/// if possible; note that \c I will be incremented when lines are merged.
///
/// Returns whether the resulting \c Line can fit in a single line.
void tryFitMultipleLinesInOne(unsigned Indent,
std::vector<AnnotatedLine>::iterator &I,
std::vector<AnnotatedLine>::iterator E) {
// We can never merge stuff if there are trailing line comments.
if (I->Last->Type == TT_LineComment)
return;
unsigned Limit = Style.ColumnLimit - (I->InPPDirective ? 1 : 0) - Indent;
// If we already exceed the column limit, we set 'Limit' to 0. The different
// tryMerge..() functions can then decide whether to still do merging.
Limit = I->Last->TotalLength > Limit ? 0 : Limit - I->Last->TotalLength;
if (I + 1 == E || (I + 1)->Type == LT_Invalid)
return;
if (I->Last->is(tok::l_brace)) {
tryMergeSimpleBlock(I, E, Limit);
} else if (I->First.is(tok::kw_if)) {
tryMergeSimpleIf(I, E, Limit);
} else if (I->InPPDirective && (I->First.FormatTok.HasUnescapedNewline ||
I->First.FormatTok.IsFirst)) {
tryMergeSimplePPDirective(I, E, Limit);
}
return;
}
void tryMergeSimplePPDirective(std::vector<AnnotatedLine>::iterator &I,
std::vector<AnnotatedLine>::iterator E,
unsigned Limit) {
if (Limit == 0)
return;
AnnotatedLine &Line = *I;
if (!(I + 1)->InPPDirective || (I + 1)->First.FormatTok.HasUnescapedNewline)
return;
if (I + 2 != E && (I + 2)->InPPDirective &&
!(I + 2)->First.FormatTok.HasUnescapedNewline)
return;
if (1 + (I + 1)->Last->TotalLength > Limit)
return;
join(Line, *(++I));
}
void tryMergeSimpleIf(std::vector<AnnotatedLine>::iterator &I,
std::vector<AnnotatedLine>::iterator E,
unsigned Limit) {
if (Limit == 0)
return;
if (!Style.AllowShortIfStatementsOnASingleLine)
return;
if ((I + 1)->InPPDirective != I->InPPDirective ||
((I + 1)->InPPDirective &&
(I + 1)->First.FormatTok.HasUnescapedNewline))
return;
AnnotatedLine &Line = *I;
if (Line.Last->isNot(tok::r_paren))
return;
if (1 + (I + 1)->Last->TotalLength > Limit)
return;
if ((I + 1)->First.is(tok::kw_if) || (I + 1)->First.Type == TT_LineComment)
return;
// Only inline simple if's (no nested if or else).
if (I + 2 != E && (I + 2)->First.is(tok::kw_else))
return;
join(Line, *(++I));
}
void tryMergeSimpleBlock(std::vector<AnnotatedLine>::iterator &I,
std::vector<AnnotatedLine>::iterator E,
unsigned Limit) {
// First, check that the current line allows merging. This is the case if
// we're not in a control flow statement and the last token is an opening
// brace.
AnnotatedLine &Line = *I;
bool AllowedTokens =
Line.First.isNot(tok::kw_if) && Line.First.isNot(tok::kw_while) &&
Line.First.isNot(tok::kw_do) && Line.First.isNot(tok::r_brace) &&
Line.First.isNot(tok::kw_else) && Line.First.isNot(tok::kw_try) &&
Line.First.isNot(tok::kw_catch) && Line.First.isNot(tok::kw_for) &&
// This gets rid of all ObjC @ keywords and methods.
Line.First.isNot(tok::at) && Line.First.isNot(tok::minus) &&
Line.First.isNot(tok::plus);
if (!AllowedTokens)
return;
AnnotatedToken *Tok = &(I + 1)->First;
if (Tok->Children.empty() && Tok->is(tok::r_brace) &&
!Tok->MustBreakBefore) {
// We merge empty blocks even if the line exceeds the column limit.
Tok->SpacesRequiredBefore = 0;
Tok->CanBreakBefore = true;
join(Line, *(I + 1));
I += 1;
} else if (Limit != 0) {
// Check that we still have three lines and they fit into the limit.
if (I + 2 == E || (I + 2)->Type == LT_Invalid ||
!nextTwoLinesFitInto(I, Limit))
return;
// Second, check that the next line does not contain any braces - if it
// does, readability declines when putting it into a single line.
if ((I + 1)->Last->Type == TT_LineComment || Tok->MustBreakBefore)
return;
do {
if (Tok->is(tok::l_brace) || Tok->is(tok::r_brace))
return;
Tok = Tok->Children.empty() ? NULL : &Tok->Children.back();
} while (Tok != NULL);
// Last, check that the third line contains a single closing brace.
Tok = &(I + 2)->First;
if (!Tok->Children.empty() || Tok->isNot(tok::r_brace) ||
Tok->MustBreakBefore)
return;
join(Line, *(I + 1));
join(Line, *(I + 2));
I += 2;
}
}
bool nextTwoLinesFitInto(std::vector<AnnotatedLine>::iterator I,
unsigned Limit) {
return 1 + (I + 1)->Last->TotalLength + 1 + (I + 2)->Last->TotalLength <=
Limit;
}
void join(AnnotatedLine &A, const AnnotatedLine &B) {
unsigned LengthA = A.Last->TotalLength + B.First.SpacesRequiredBefore;
A.Last->Children.push_back(B.First);
while (!A.Last->Children.empty()) {
A.Last->Children[0].Parent = A.Last;
A.Last->Children[0].TotalLength += LengthA;
A.Last = &A.Last->Children[0];
}
}
bool touchesRanges(const AnnotatedLine &TheLine) {
const FormatToken *First = &TheLine.First.FormatTok;
const FormatToken *Last = &TheLine.Last->FormatTok;
CharSourceRange LineRange = CharSourceRange::getTokenRange(
First->Tok.getLocation(), Last->Tok.getLocation());
for (unsigned i = 0, e = Ranges.size(); i != e; ++i) {
if (!SourceMgr.isBeforeInTranslationUnit(LineRange.getEnd(),
Ranges[i].getBegin()) &&
!SourceMgr.isBeforeInTranslationUnit(Ranges[i].getEnd(),
LineRange.getBegin()))
return true;
}
return false;
}
virtual void consumeUnwrappedLine(const UnwrappedLine &TheLine) {
AnnotatedLines.push_back(AnnotatedLine(TheLine));
}
/// \brief Add a new line and the required indent before the first Token
/// of the \c UnwrappedLine if there was no structural parsing error.
/// Returns the indent level of the \c UnwrappedLine.
void formatFirstToken(const AnnotatedToken &RootToken, unsigned Indent,
bool InPPDirective, unsigned PreviousEndOfLineColumn) {
const FormatToken &Tok = RootToken.FormatTok;
unsigned Newlines =
std::min(Tok.NewlinesBefore, Style.MaxEmptyLinesToKeep + 1);
if (Newlines == 0 && !Tok.IsFirst)
Newlines = 1;
if (!InPPDirective || Tok.HasUnescapedNewline) {
Whitespaces.replaceWhitespace(RootToken, Newlines, Indent, 0, Style);
} else {
Whitespaces.replacePPWhitespace(RootToken, Newlines, Indent,
PreviousEndOfLineColumn, Style);
}
}
DiagnosticsEngine &Diag;
FormatStyle Style;
Lexer &Lex;
SourceManager &SourceMgr;
WhitespaceManager Whitespaces;
std::vector<CharSourceRange> Ranges;
std::vector<AnnotatedLine> AnnotatedLines;
bool StructuralError;
};
tooling::Replacements
reformat(const FormatStyle &Style, Lexer &Lex, SourceManager &SourceMgr,
std::vector<CharSourceRange> Ranges, DiagnosticConsumer *DiagClient) {
IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts = new DiagnosticOptions();
OwningPtr<DiagnosticConsumer> DiagPrinter;
if (DiagClient == 0) {
DiagPrinter.reset(new TextDiagnosticPrinter(llvm::errs(), &*DiagOpts));
DiagPrinter->BeginSourceFile(Lex.getLangOpts(), Lex.getPP());
DiagClient = DiagPrinter.get();
}
DiagnosticsEngine Diagnostics(
IntrusiveRefCntPtr<DiagnosticIDs>(new DiagnosticIDs()), &*DiagOpts,
DiagClient, false);
Diagnostics.setSourceManager(&SourceMgr);
Formatter formatter(Diagnostics, Style, Lex, SourceMgr, Ranges);
return formatter.format();
}
LangOptions getFormattingLangOpts() {
LangOptions LangOpts;
LangOpts.CPlusPlus = 1;
LangOpts.CPlusPlus11 = 1;
LangOpts.Bool = 1;
LangOpts.ObjC1 = 1;
LangOpts.ObjC2 = 1;
return LangOpts;
}
} // namespace format
} // namespace clang
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