forked from OSchip/llvm-project
1053 lines
38 KiB
C++
1053 lines
38 KiB
C++
//===--- Format.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 functions declared in Format.h. This will be
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/// split into separate files as we go.
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///
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/// This is EXPERIMENTAL code under heavy development. It is not in a state yet,
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/// where it can be used to format real code.
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///
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//===----------------------------------------------------------------------===//
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#include "clang/Format/Format.h"
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#include "UnwrappedLineParser.h"
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#include "clang/Basic/SourceManager.h"
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#include "clang/Basic/OperatorPrecedence.h"
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#include "clang/Lex/Lexer.h"
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#include <string>
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namespace clang {
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namespace format {
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// FIXME: Move somewhere sane.
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struct TokenAnnotation {
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enum TokenType {
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TT_Unknown,
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TT_TemplateOpener,
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TT_TemplateCloser,
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TT_BinaryOperator,
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TT_UnaryOperator,
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TT_TrailingUnaryOperator,
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TT_OverloadedOperator,
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TT_PointerOrReference,
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TT_ConditionalExpr,
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TT_CtorInitializerColon,
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TT_LineComment,
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TT_BlockComment,
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TT_DirectorySeparator,
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TT_ObjCMethodSpecifier
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};
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TokenType Type;
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bool SpaceRequiredBefore;
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bool CanBreakBefore;
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bool MustBreakBefore;
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};
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static prec::Level getPrecedence(const FormatToken &Tok) {
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return getBinOpPrecedence(Tok.Tok.getKind(), true, true);
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}
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using llvm::MutableArrayRef;
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FormatStyle getLLVMStyle() {
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FormatStyle LLVMStyle;
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LLVMStyle.ColumnLimit = 80;
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LLVMStyle.MaxEmptyLinesToKeep = 1;
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LLVMStyle.PointerAndReferenceBindToType = false;
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LLVMStyle.AccessModifierOffset = -2;
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LLVMStyle.SplitTemplateClosingGreater = true;
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LLVMStyle.IndentCaseLabels = false;
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return LLVMStyle;
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}
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FormatStyle getGoogleStyle() {
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FormatStyle GoogleStyle;
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GoogleStyle.ColumnLimit = 80;
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GoogleStyle.MaxEmptyLinesToKeep = 1;
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GoogleStyle.PointerAndReferenceBindToType = true;
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GoogleStyle.AccessModifierOffset = -1;
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GoogleStyle.SplitTemplateClosingGreater = false;
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GoogleStyle.IndentCaseLabels = true;
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return GoogleStyle;
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}
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struct OptimizationParameters {
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unsigned PenaltyIndentLevel;
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unsigned PenaltyLevelDecrease;
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};
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class UnwrappedLineFormatter {
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public:
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UnwrappedLineFormatter(const FormatStyle &Style, SourceManager &SourceMgr,
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const UnwrappedLine &Line,
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const std::vector<TokenAnnotation> &Annotations,
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tooling::Replacements &Replaces, bool StructuralError)
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: Style(Style), SourceMgr(SourceMgr), Line(Line),
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Annotations(Annotations), Replaces(Replaces),
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StructuralError(StructuralError) {
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Parameters.PenaltyIndentLevel = 15;
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Parameters.PenaltyLevelDecrease = 10;
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}
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void format() {
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// Format first token and initialize indent.
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unsigned Indent = formatFirstToken();
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// Initialize state dependent on indent.
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IndentState State;
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State.Column = Indent;
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State.ConsumedTokens = 0;
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State.Indent.push_back(Indent + 4);
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State.LastSpace.push_back(Indent);
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State.FirstLessLess.push_back(0);
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State.ForLoopVariablePos = 0;
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State.LineContainsContinuedForLoopSection = false;
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State.StartOfLineLevel = 1;
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// The first token has already been indented and thus consumed.
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moveStateToNextToken(State);
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// Check whether the UnwrappedLine can be put onto a single line. If so,
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// this is bound to be the optimal solution (by definition) and we don't
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// need to analyze the entire solution space.
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unsigned Columns = State.Column;
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bool FitsOnALine = true;
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for (unsigned i = 1, n = Line.Tokens.size(); i != n; ++i) {
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Columns += (Annotations[i].SpaceRequiredBefore ? 1 : 0) +
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Line.Tokens[i].Tok.getLength();
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// A special case for the colon of a constructor initializer as this only
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// needs to be put on a new line if the line needs to be split.
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if (Columns > Style.ColumnLimit ||
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(Annotations[i].MustBreakBefore &&
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Annotations[i].Type != TokenAnnotation::TT_CtorInitializerColon)) {
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FitsOnALine = false;
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break;
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}
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}
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// Start iterating at 1 as we have correctly formatted of Token #0 above.
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for (unsigned i = 1, n = Line.Tokens.size(); i != n; ++i) {
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if (FitsOnALine) {
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addTokenToState(false, false, State);
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} else {
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unsigned NoBreak = calcPenalty(State, false, UINT_MAX);
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unsigned Break = calcPenalty(State, true, NoBreak);
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addTokenToState(Break < NoBreak, false, State);
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}
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}
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}
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private:
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/// \brief The current state when indenting a unwrapped line.
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///
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/// As the indenting tries different combinations this is copied by value.
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struct IndentState {
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/// \brief The number of used columns in the current line.
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unsigned Column;
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/// \brief The number of tokens already consumed.
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unsigned ConsumedTokens;
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/// \brief The parenthesis level of the first token on the current line.
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unsigned StartOfLineLevel;
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/// \brief The position to which a specific parenthesis level needs to be
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/// indented.
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std::vector<unsigned> Indent;
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/// \brief The position of the last space on each level.
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///
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/// Used e.g. to break like:
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/// functionCall(Parameter, otherCall(
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/// OtherParameter));
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std::vector<unsigned> LastSpace;
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/// \brief The position the first "<<" operator encountered on each level.
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///
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/// Used to align "<<" operators. 0 if no such operator has been encountered
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/// on a level.
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std::vector<unsigned> FirstLessLess;
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/// \brief The column of the first variable in a for-loop declaration.
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///
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/// Used to align the second variable if necessary.
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unsigned ForLoopVariablePos;
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/// \brief \c true if this line contains a continued for-loop section.
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bool LineContainsContinuedForLoopSection;
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/// \brief Comparison operator to be able to used \c IndentState in \c map.
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bool operator<(const IndentState &Other) const {
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if (Other.ConsumedTokens != ConsumedTokens)
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return Other.ConsumedTokens > ConsumedTokens;
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if (Other.Column != Column)
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return Other.Column > Column;
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if (Other.StartOfLineLevel != StartOfLineLevel)
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return Other.StartOfLineLevel > StartOfLineLevel;
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if (Other.Indent.size() != Indent.size())
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return Other.Indent.size() > Indent.size();
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for (int i = 0, e = Indent.size(); i != e; ++i) {
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if (Other.Indent[i] != Indent[i])
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return Other.Indent[i] > Indent[i];
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}
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if (Other.LastSpace.size() != LastSpace.size())
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return Other.LastSpace.size() > LastSpace.size();
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for (int i = 0, e = LastSpace.size(); i != e; ++i) {
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if (Other.LastSpace[i] != LastSpace[i])
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return Other.LastSpace[i] > LastSpace[i];
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}
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if (Other.FirstLessLess.size() != FirstLessLess.size())
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return Other.FirstLessLess.size() > FirstLessLess.size();
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for (int i = 0, e = FirstLessLess.size(); i != e; ++i) {
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if (Other.FirstLessLess[i] != FirstLessLess[i])
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return Other.FirstLessLess[i] > FirstLessLess[i];
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}
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if (Other.ForLoopVariablePos != ForLoopVariablePos)
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return Other.ForLoopVariablePos < ForLoopVariablePos;
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if (Other.LineContainsContinuedForLoopSection !=
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LineContainsContinuedForLoopSection)
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return LineContainsContinuedForLoopSection;
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return false;
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}
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};
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/// \brief Appends the next token to \p State and updates information
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/// necessary for indentation.
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///
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/// Puts the token on the current line if \p Newline is \c true and adds a
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/// line break and necessary indentation otherwise.
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///
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/// If \p DryRun is \c false, also creates and stores the required
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/// \c Replacement.
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void addTokenToState(bool Newline, bool DryRun, IndentState &State) {
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unsigned Index = State.ConsumedTokens;
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const FormatToken &Current = Line.Tokens[Index];
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const FormatToken &Previous = Line.Tokens[Index - 1];
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unsigned ParenLevel = State.Indent.size() - 1;
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if (Newline) {
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if (Current.Tok.is(tok::string_literal) &&
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Previous.Tok.is(tok::string_literal)) {
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State.Column = State.Column - Previous.Tok.getLength();
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} else if (Current.Tok.is(tok::lessless) &&
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State.FirstLessLess[ParenLevel] != 0) {
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State.Column = State.FirstLessLess[ParenLevel];
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} else if (ParenLevel != 0 &&
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(Previous.Tok.is(tok::equal) || Current.Tok.is(tok::arrow) ||
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Current.Tok.is(tok::period))) {
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// Indent and extra 4 spaces after '=' as it continues an expression.
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// Don't do that on the top level, as we already indent 4 there.
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State.Column = State.Indent[ParenLevel] + 4;
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} else if (
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Line.Tokens[0].Tok.is(tok::kw_for) && Previous.Tok.is(tok::comma)) {
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State.Column = State.ForLoopVariablePos;
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} else {
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State.Column = State.Indent[ParenLevel];
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}
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State.StartOfLineLevel = ParenLevel + 1;
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if (Line.Tokens[0].Tok.is(tok::kw_for))
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State.LineContainsContinuedForLoopSection =
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Previous.Tok.isNot(tok::semi);
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if (!DryRun)
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replaceWhitespace(Current, 1, State.Column);
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State.LastSpace[ParenLevel] = State.Indent[ParenLevel];
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if (Current.Tok.is(tok::colon) &&
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Annotations[Index].Type != TokenAnnotation::TT_ConditionalExpr &&
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Annotations[0].Type != TokenAnnotation::TT_ObjCMethodSpecifier)
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State.Indent[ParenLevel] += 2;
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} else {
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if (Current.Tok.is(tok::equal) && Line.Tokens[0].Tok.is(tok::kw_for))
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State.ForLoopVariablePos = State.Column - Previous.Tok.getLength();
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unsigned Spaces = Annotations[Index].SpaceRequiredBefore ? 1 : 0;
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if (Annotations[Index].Type == TokenAnnotation::TT_LineComment)
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Spaces = 2;
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if (!DryRun)
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replaceWhitespace(Current, 0, Spaces);
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// FIXME: Look into using this alignment at other ParenLevels.
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if (ParenLevel == 0 && (getPrecedence(Previous) == prec::Assignment ||
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Previous.Tok.is(tok::kw_return)))
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State.Indent[ParenLevel] = State.Column + Spaces;
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if (Previous.Tok.is(tok::l_paren) ||
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Annotations[Index - 1].Type == TokenAnnotation::TT_TemplateOpener)
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State.Indent[ParenLevel] = State.Column;
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// Top-level spaces are exempt as that mostly leads to better results.
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State.Column += Spaces;
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if (Spaces > 0 && ParenLevel != 0)
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State.LastSpace[ParenLevel] = State.Column;
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}
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moveStateToNextToken(State);
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}
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/// \brief Mark the next token as consumed in \p State and modify its stacks
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/// accordingly.
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void moveStateToNextToken(IndentState &State) {
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unsigned Index = State.ConsumedTokens;
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const FormatToken &Current = Line.Tokens[Index];
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unsigned ParenLevel = State.Indent.size() - 1;
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if (Current.Tok.is(tok::lessless) && State.FirstLessLess[ParenLevel] == 0)
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State.FirstLessLess[ParenLevel] = State.Column;
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State.Column += Current.Tok.getLength();
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// If we encounter an opening (, [, { or <, we add a level to our stacks to
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// prepare for the following tokens.
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if (Current.Tok.is(tok::l_paren) || Current.Tok.is(tok::l_square) ||
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Current.Tok.is(tok::l_brace) ||
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Annotations[Index].Type == TokenAnnotation::TT_TemplateOpener) {
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State.Indent.push_back(4 + State.LastSpace.back());
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State.LastSpace.push_back(State.LastSpace.back());
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State.FirstLessLess.push_back(0);
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}
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// If we encounter a closing ), ], } or >, we can remove a level from our
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// stacks.
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if (Current.Tok.is(tok::r_paren) || Current.Tok.is(tok::r_square) ||
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(Current.Tok.is(tok::r_brace) && State.ConsumedTokens > 0) ||
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Annotations[Index].Type == TokenAnnotation::TT_TemplateCloser) {
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State.Indent.pop_back();
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State.LastSpace.pop_back();
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State.FirstLessLess.pop_back();
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}
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++State.ConsumedTokens;
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}
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/// \brief Calculate the panelty for splitting after the token at \p Index.
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unsigned splitPenalty(unsigned Index) {
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assert(Index < Line.Tokens.size() &&
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"Tried to calculate penalty for splitting after the last token");
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const FormatToken &Left = Line.Tokens[Index];
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const FormatToken &Right = Line.Tokens[Index + 1];
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// In for-loops, prefer breaking at ',' and ';'.
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if (Line.Tokens[0].Tok.is(tok::kw_for) &&
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(Left.Tok.isNot(tok::comma) && Left.Tok.isNot(tok::semi)))
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return 20;
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if (Left.Tok.is(tok::semi) || Left.Tok.is(tok::comma))
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return 0;
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if (Left.Tok.is(tok::l_paren))
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return 2;
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prec::Level Level = getPrecedence(Line.Tokens[Index]);
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if (Level != prec::Unknown)
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return Level;
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if (Right.Tok.is(tok::arrow) || Right.Tok.is(tok::period))
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return 50;
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return 3;
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}
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/// \brief Calculate the number of lines needed to format the remaining part
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/// of the unwrapped line.
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///
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/// Assumes the formatting so far has led to
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/// the \c IndentState \p State. If \p NewLine is set, a new line will be
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/// added after the previous token.
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///
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/// \param StopAt is used for optimization. If we can determine that we'll
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/// definitely need at least \p StopAt additional lines, we already know of a
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/// better solution.
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unsigned calcPenalty(IndentState State, bool NewLine, unsigned StopAt) {
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// We are at the end of the unwrapped line, so we don't need any more lines.
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if (State.ConsumedTokens >= Line.Tokens.size())
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return 0;
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if (!NewLine && Annotations[State.ConsumedTokens].MustBreakBefore)
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return UINT_MAX;
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if (NewLine && !Annotations[State.ConsumedTokens].CanBreakBefore)
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return UINT_MAX;
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if (!NewLine && Line.Tokens[State.ConsumedTokens - 1].Tok.is(tok::semi) &&
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State.LineContainsContinuedForLoopSection)
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return UINT_MAX;
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unsigned CurrentPenalty = 0;
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if (NewLine) {
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CurrentPenalty += Parameters.PenaltyIndentLevel * State.Indent.size() +
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splitPenalty(State.ConsumedTokens - 1);
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} else {
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if (State.Indent.size() < State.StartOfLineLevel)
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CurrentPenalty += Parameters.PenaltyLevelDecrease *
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(State.StartOfLineLevel - State.Indent.size());
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}
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addTokenToState(NewLine, true, State);
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// Exceeding column limit is bad.
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if (State.Column > Style.ColumnLimit)
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return UINT_MAX;
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if (StopAt <= CurrentPenalty)
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return UINT_MAX;
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StopAt -= CurrentPenalty;
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StateMap::iterator I = Memory.find(State);
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if (I != Memory.end()) {
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// If this state has already been examined, we can safely return the
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// previous result if we
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// - have not hit the optimatization (and thus returned UINT_MAX) OR
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// - are now computing for a smaller or equal StopAt.
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unsigned SavedResult = I->second.first;
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unsigned SavedStopAt = I->second.second;
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if (SavedResult != UINT_MAX)
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return SavedResult + CurrentPenalty;
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else if (StopAt <= SavedStopAt)
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return UINT_MAX;
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}
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unsigned NoBreak = calcPenalty(State, false, StopAt);
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unsigned WithBreak = calcPenalty(State, true, std::min(StopAt, NoBreak));
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unsigned Result = std::min(NoBreak, WithBreak);
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// We have to store 'Result' without adding 'CurrentPenalty' as the latter
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// can depend on 'NewLine'.
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Memory[State] = std::pair<unsigned, unsigned>(Result, StopAt);
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return Result == UINT_MAX ? UINT_MAX : Result + CurrentPenalty;
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}
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/// \brief Replaces the whitespace in front of \p Tok. Only call once for
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/// each \c FormatToken.
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void replaceWhitespace(const FormatToken &Tok, unsigned NewLines,
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unsigned Spaces) {
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Replaces.insert(tooling::Replacement(
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SourceMgr, Tok.WhiteSpaceStart, Tok.WhiteSpaceLength,
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std::string(NewLines, '\n') + std::string(Spaces, ' ')));
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}
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/// \brief Add a new line and the required indent before the first Token
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/// of the \c UnwrappedLine if there was no structural parsing error.
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/// Returns the indent level of the \c UnwrappedLine.
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unsigned formatFirstToken() {
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const FormatToken &Token = Line.Tokens[0];
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if (!Token.WhiteSpaceStart.isValid() || StructuralError)
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return SourceMgr.getSpellingColumnNumber(Token.Tok.getLocation()) - 1;
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unsigned Newlines =
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std::min(Token.NewlinesBefore, Style.MaxEmptyLinesToKeep + 1);
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unsigned Offset = SourceMgr.getFileOffset(Token.WhiteSpaceStart);
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if (Newlines == 0 && Offset != 0)
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Newlines = 1;
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unsigned Indent = Line.Level * 2;
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if ((Token.Tok.is(tok::kw_public) || Token.Tok.is(tok::kw_protected) ||
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Token.Tok.is(tok::kw_private)) &&
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static_cast<int>(Indent) + Style.AccessModifierOffset >= 0)
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Indent += Style.AccessModifierOffset;
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replaceWhitespace(Token, Newlines, Indent);
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return Indent;
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}
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FormatStyle Style;
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SourceManager &SourceMgr;
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const UnwrappedLine &Line;
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const std::vector<TokenAnnotation> &Annotations;
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tooling::Replacements &Replaces;
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bool StructuralError;
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// A map from an indent state to a pair (Result, Used-StopAt).
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typedef std::map<IndentState, std::pair<unsigned, unsigned> > StateMap;
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StateMap Memory;
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OptimizationParameters Parameters;
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};
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|
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/// \brief Determines extra information about the tokens comprising an
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/// \c UnwrappedLine.
|
|
class TokenAnnotator {
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public:
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TokenAnnotator(const UnwrappedLine &Line, const FormatStyle &Style,
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SourceManager &SourceMgr)
|
|
: Line(Line), Style(Style), SourceMgr(SourceMgr) {
|
|
}
|
|
|
|
/// \brief A parser that gathers additional information about tokens.
|
|
///
|
|
/// The \c TokenAnnotator tries to matches parenthesis and square brakets and
|
|
/// store a parenthesis levels. It also tries to resolve matching "<" and ">"
|
|
/// into template parameter lists.
|
|
class AnnotatingParser {
|
|
public:
|
|
AnnotatingParser(const SmallVector<FormatToken, 16> &Tokens,
|
|
std::vector<TokenAnnotation> &Annotations)
|
|
: Tokens(Tokens), Annotations(Annotations), Index(0) {
|
|
}
|
|
|
|
bool parseAngle() {
|
|
while (Index < Tokens.size()) {
|
|
if (Tokens[Index].Tok.is(tok::greater)) {
|
|
Annotations[Index].Type = TokenAnnotation::TT_TemplateCloser;
|
|
next();
|
|
return true;
|
|
}
|
|
if (Tokens[Index].Tok.is(tok::r_paren) ||
|
|
Tokens[Index].Tok.is(tok::r_square))
|
|
return false;
|
|
if (Tokens[Index].Tok.is(tok::pipepipe) ||
|
|
Tokens[Index].Tok.is(tok::ampamp) ||
|
|
Tokens[Index].Tok.is(tok::question) ||
|
|
Tokens[Index].Tok.is(tok::colon))
|
|
return false;
|
|
consumeToken();
|
|
}
|
|
return false;
|
|
}
|
|
|
|
bool parseParens() {
|
|
while (Index < Tokens.size()) {
|
|
if (Tokens[Index].Tok.is(tok::r_paren)) {
|
|
next();
|
|
return true;
|
|
}
|
|
if (Tokens[Index].Tok.is(tok::r_square))
|
|
return false;
|
|
consumeToken();
|
|
}
|
|
return false;
|
|
}
|
|
|
|
bool parseSquare() {
|
|
while (Index < Tokens.size()) {
|
|
if (Tokens[Index].Tok.is(tok::r_square)) {
|
|
next();
|
|
return true;
|
|
}
|
|
if (Tokens[Index].Tok.is(tok::r_paren))
|
|
return false;
|
|
consumeToken();
|
|
}
|
|
return false;
|
|
}
|
|
|
|
bool parseConditional() {
|
|
while (Index < Tokens.size()) {
|
|
if (Tokens[Index].Tok.is(tok::colon)) {
|
|
Annotations[Index].Type = TokenAnnotation::TT_ConditionalExpr;
|
|
next();
|
|
return true;
|
|
}
|
|
consumeToken();
|
|
}
|
|
return false;
|
|
}
|
|
|
|
void consumeToken() {
|
|
unsigned CurrentIndex = Index;
|
|
next();
|
|
switch (Tokens[CurrentIndex].Tok.getKind()) {
|
|
case tok::l_paren:
|
|
parseParens();
|
|
if (Index < Tokens.size() && Tokens[Index].Tok.is(tok::colon)) {
|
|
Annotations[Index].Type = TokenAnnotation::TT_CtorInitializerColon;
|
|
next();
|
|
}
|
|
break;
|
|
case tok::l_square:
|
|
parseSquare();
|
|
break;
|
|
case tok::less:
|
|
if (parseAngle())
|
|
Annotations[CurrentIndex].Type = TokenAnnotation::TT_TemplateOpener;
|
|
else {
|
|
Annotations[CurrentIndex].Type = TokenAnnotation::TT_BinaryOperator;
|
|
Index = CurrentIndex + 1;
|
|
}
|
|
break;
|
|
case tok::greater:
|
|
Annotations[CurrentIndex].Type = TokenAnnotation::TT_BinaryOperator;
|
|
break;
|
|
case tok::kw_operator:
|
|
if (Tokens[Index].Tok.is(tok::l_paren)) {
|
|
Annotations[Index].Type = TokenAnnotation::TT_OverloadedOperator;
|
|
next();
|
|
if (Index < Tokens.size() && Tokens[Index].Tok.is(tok::r_paren)) {
|
|
Annotations[Index].Type = TokenAnnotation::TT_OverloadedOperator;
|
|
next();
|
|
}
|
|
} else {
|
|
while (Index < Tokens.size() && !Tokens[Index].Tok.is(tok::l_paren)) {
|
|
Annotations[Index].Type = TokenAnnotation::TT_OverloadedOperator;
|
|
next();
|
|
}
|
|
}
|
|
break;
|
|
case tok::question:
|
|
parseConditional();
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
void parseIncludeDirective() {
|
|
while (Index < Tokens.size()) {
|
|
if (Tokens[Index].Tok.is(tok::slash))
|
|
Annotations[Index].Type = TokenAnnotation::TT_DirectorySeparator;
|
|
else if (Tokens[Index].Tok.is(tok::less))
|
|
Annotations[Index].Type = TokenAnnotation::TT_TemplateOpener;
|
|
else if (Tokens[Index].Tok.is(tok::greater))
|
|
Annotations[Index].Type = TokenAnnotation::TT_TemplateCloser;
|
|
next();
|
|
}
|
|
}
|
|
|
|
void parsePreprocessorDirective() {
|
|
next();
|
|
if (Index >= Tokens.size())
|
|
return;
|
|
switch (Tokens[Index].Tok.getIdentifierInfo()->getPPKeywordID()) {
|
|
case tok::pp_include:
|
|
case tok::pp_import:
|
|
parseIncludeDirective();
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
void parseLine() {
|
|
if (Tokens[Index].Tok.is(tok::hash)) {
|
|
parsePreprocessorDirective();
|
|
return;
|
|
}
|
|
while (Index < Tokens.size()) {
|
|
consumeToken();
|
|
}
|
|
}
|
|
|
|
void next() {
|
|
++Index;
|
|
}
|
|
|
|
private:
|
|
const SmallVector<FormatToken, 16> &Tokens;
|
|
std::vector<TokenAnnotation> &Annotations;
|
|
unsigned Index;
|
|
};
|
|
|
|
void annotate() {
|
|
Annotations.clear();
|
|
for (int i = 0, e = Line.Tokens.size(); i != e; ++i) {
|
|
Annotations.push_back(TokenAnnotation());
|
|
}
|
|
|
|
AnnotatingParser Parser(Line.Tokens, Annotations);
|
|
Parser.parseLine();
|
|
|
|
determineTokenTypes();
|
|
bool IsObjCMethodDecl =
|
|
(Line.Tokens.size() > 0 &&
|
|
(Annotations[0].Type == TokenAnnotation::TT_ObjCMethodSpecifier));
|
|
for (int i = 1, e = Line.Tokens.size(); i != e; ++i) {
|
|
TokenAnnotation &Annotation = Annotations[i];
|
|
|
|
Annotation.CanBreakBefore = canBreakBefore(i);
|
|
|
|
if (Annotation.Type == TokenAnnotation::TT_CtorInitializerColon) {
|
|
Annotation.MustBreakBefore = true;
|
|
Annotation.SpaceRequiredBefore = true;
|
|
} else if (Annotation.Type == TokenAnnotation::TT_OverloadedOperator) {
|
|
Annotation.SpaceRequiredBefore =
|
|
Line.Tokens[i].Tok.is(tok::identifier) ||
|
|
Line.Tokens[i].Tok.is(tok::kw_new) ||
|
|
Line.Tokens[i].Tok.is(tok::kw_delete);
|
|
} else if (
|
|
Annotations[i - 1].Type == TokenAnnotation::TT_OverloadedOperator) {
|
|
Annotation.SpaceRequiredBefore = false;
|
|
} else if (IsObjCMethodDecl && Line.Tokens[i].Tok.is(tok::identifier) &&
|
|
(i != e - 1) && Line.Tokens[i + 1].Tok.is(tok::colon) &&
|
|
Line.Tokens[i - 1].Tok.is(tok::identifier)) {
|
|
Annotation.CanBreakBefore = true;
|
|
Annotation.SpaceRequiredBefore = true;
|
|
} else if (IsObjCMethodDecl && Line.Tokens[i].Tok.is(tok::identifier) &&
|
|
Line.Tokens[i - 1].Tok.is(tok::l_paren) &&
|
|
Line.Tokens[i - 2].Tok.is(tok::colon)) {
|
|
// Don't break this identifier as ':' or identifier
|
|
// before it will break.
|
|
Annotation.CanBreakBefore = false;
|
|
} else if (Line.Tokens[i].Tok.is(tok::at) &&
|
|
Line.Tokens[i - 2].Tok.is(tok::at)) {
|
|
// Don't put two objc's '@' on the same line. This could happen,
|
|
// as in, @optional @property ...
|
|
Annotation.MustBreakBefore = true;
|
|
} else if (Line.Tokens[i].Tok.is(tok::colon)) {
|
|
Annotation.SpaceRequiredBefore =
|
|
Line.Tokens[0].Tok.isNot(tok::kw_case) && !IsObjCMethodDecl &&
|
|
(i != e - 1);
|
|
// Don't break at ':' if identifier before it can beak.
|
|
if (IsObjCMethodDecl && Line.Tokens[i - 1].Tok.is(tok::identifier) &&
|
|
Annotations[i - 1].CanBreakBefore)
|
|
Annotation.CanBreakBefore = false;
|
|
} else if (
|
|
Annotations[i - 1].Type == TokenAnnotation::TT_ObjCMethodSpecifier) {
|
|
Annotation.SpaceRequiredBefore = true;
|
|
} else if (Annotations[i - 1].Type == TokenAnnotation::TT_UnaryOperator) {
|
|
Annotation.SpaceRequiredBefore = false;
|
|
} else if (Annotation.Type == TokenAnnotation::TT_UnaryOperator) {
|
|
Annotation.SpaceRequiredBefore =
|
|
Line.Tokens[i - 1].Tok.isNot(tok::l_paren) &&
|
|
Line.Tokens[i - 1].Tok.isNot(tok::l_square);
|
|
} else if (Line.Tokens[i - 1].Tok.is(tok::greater) &&
|
|
Line.Tokens[i].Tok.is(tok::greater)) {
|
|
if (Annotation.Type == TokenAnnotation::TT_TemplateCloser &&
|
|
Annotations[i - 1].Type == TokenAnnotation::TT_TemplateCloser)
|
|
Annotation.SpaceRequiredBefore = Style.SplitTemplateClosingGreater;
|
|
else
|
|
Annotation.SpaceRequiredBefore = false;
|
|
} else if (
|
|
Annotation.Type == TokenAnnotation::TT_DirectorySeparator ||
|
|
Annotations[i - 1].Type == TokenAnnotation::TT_DirectorySeparator) {
|
|
Annotation.SpaceRequiredBefore = false;
|
|
} else if (
|
|
Annotation.Type == TokenAnnotation::TT_BinaryOperator ||
|
|
Annotations[i - 1].Type == TokenAnnotation::TT_BinaryOperator) {
|
|
Annotation.SpaceRequiredBefore = true;
|
|
} else if (
|
|
Annotations[i - 1].Type == TokenAnnotation::TT_TemplateCloser &&
|
|
Line.Tokens[i].Tok.is(tok::l_paren)) {
|
|
Annotation.SpaceRequiredBefore = false;
|
|
} else if (Line.Tokens[i].Tok.is(tok::less) &&
|
|
Line.Tokens[0].Tok.is(tok::hash)) {
|
|
Annotation.SpaceRequiredBefore = true;
|
|
} else if (IsObjCMethodDecl && Line.Tokens[i - 1].Tok.is(tok::r_paren) &&
|
|
Line.Tokens[i].Tok.is(tok::identifier)) {
|
|
// Don't space between ')' and <id>
|
|
Annotation.SpaceRequiredBefore = false;
|
|
} else if (IsObjCMethodDecl && Line.Tokens[i - 1].Tok.is(tok::colon) &&
|
|
Line.Tokens[i].Tok.is(tok::l_paren)) {
|
|
// Don't space between ':' and '('
|
|
Annotation.SpaceRequiredBefore = false;
|
|
} else if (Annotation.Type == TokenAnnotation::TT_TrailingUnaryOperator) {
|
|
Annotation.SpaceRequiredBefore = false;
|
|
} else {
|
|
Annotation.SpaceRequiredBefore =
|
|
spaceRequiredBetween(Line.Tokens[i - 1].Tok, Line.Tokens[i].Tok);
|
|
}
|
|
|
|
if (Annotations[i - 1].Type == TokenAnnotation::TT_LineComment ||
|
|
(Line.Tokens[i].Tok.is(tok::string_literal) &&
|
|
Line.Tokens[i - 1].Tok.is(tok::string_literal))) {
|
|
Annotation.MustBreakBefore = true;
|
|
}
|
|
|
|
if (Annotation.MustBreakBefore)
|
|
Annotation.CanBreakBefore = true;
|
|
}
|
|
}
|
|
|
|
const std::vector<TokenAnnotation> &getAnnotations() {
|
|
return Annotations;
|
|
}
|
|
|
|
private:
|
|
void determineTokenTypes() {
|
|
bool IsRHS = false;
|
|
for (int i = 0, e = Line.Tokens.size(); i != e; ++i) {
|
|
TokenAnnotation &Annotation = Annotations[i];
|
|
const FormatToken &Tok = Line.Tokens[i];
|
|
|
|
if (getPrecedence(Tok) == prec::Assignment)
|
|
IsRHS = true;
|
|
else if (Tok.Tok.is(tok::kw_return))
|
|
IsRHS = true;
|
|
|
|
if (Annotation.Type != TokenAnnotation::TT_Unknown)
|
|
continue;
|
|
|
|
if (Tok.Tok.is(tok::star) || Tok.Tok.is(tok::amp)) {
|
|
Annotation.Type = determineStarAmpUsage(i, IsRHS);
|
|
} else if (Tok.Tok.is(tok::minus) || Tok.Tok.is(tok::plus)) {
|
|
Annotation.Type = determinePlusMinusUsage(i);
|
|
} else if (Tok.Tok.is(tok::minusminus) || Tok.Tok.is(tok::plusplus)) {
|
|
Annotation.Type = determineIncrementUsage(i);
|
|
} else if (Tok.Tok.is(tok::exclaim)) {
|
|
Annotation.Type = TokenAnnotation::TT_UnaryOperator;
|
|
} else if (isBinaryOperator(Line.Tokens[i])) {
|
|
Annotation.Type = TokenAnnotation::TT_BinaryOperator;
|
|
} else if (Tok.Tok.is(tok::comment)) {
|
|
StringRef Data(SourceMgr.getCharacterData(Tok.Tok.getLocation()),
|
|
Tok.Tok.getLength());
|
|
if (Data.startswith("//"))
|
|
Annotation.Type = TokenAnnotation::TT_LineComment;
|
|
else
|
|
Annotation.Type = TokenAnnotation::TT_BlockComment;
|
|
}
|
|
}
|
|
}
|
|
|
|
bool isBinaryOperator(const FormatToken &Tok) {
|
|
// Comma is a binary operator, but does not behave as such wrt. formatting.
|
|
return getPrecedence(Tok) > prec::Comma;
|
|
}
|
|
|
|
TokenAnnotation::TokenType determineStarAmpUsage(unsigned Index, bool IsRHS) {
|
|
if (Index == Annotations.size())
|
|
return TokenAnnotation::TT_Unknown;
|
|
|
|
if (Index == 0 || Line.Tokens[Index - 1].Tok.is(tok::l_paren) ||
|
|
Line.Tokens[Index - 1].Tok.is(tok::comma) ||
|
|
Line.Tokens[Index - 1].Tok.is(tok::kw_return) ||
|
|
Line.Tokens[Index - 1].Tok.is(tok::colon) ||
|
|
Annotations[Index - 1].Type == TokenAnnotation::TT_BinaryOperator)
|
|
return TokenAnnotation::TT_UnaryOperator;
|
|
|
|
if (Line.Tokens[Index - 1].Tok.isLiteral() ||
|
|
Line.Tokens[Index + 1].Tok.isLiteral() ||
|
|
Line.Tokens[Index + 1].Tok.is(tok::kw_sizeof))
|
|
return TokenAnnotation::TT_BinaryOperator;
|
|
|
|
// It is very unlikely that we are going to find a pointer or reference type
|
|
// definition on the RHS of an assignment.
|
|
if (IsRHS)
|
|
return TokenAnnotation::TT_BinaryOperator;
|
|
|
|
return TokenAnnotation::TT_PointerOrReference;
|
|
}
|
|
|
|
TokenAnnotation::TokenType determinePlusMinusUsage(unsigned Index) {
|
|
// At the start of the line, +/- specific ObjectiveC method declarations.
|
|
if (Index == 0)
|
|
return TokenAnnotation::TT_ObjCMethodSpecifier;
|
|
|
|
// Use heuristics to recognize unary operators.
|
|
const Token &PreviousTok = Line.Tokens[Index - 1].Tok;
|
|
if (PreviousTok.is(tok::equal) || PreviousTok.is(tok::l_paren) ||
|
|
PreviousTok.is(tok::comma) || PreviousTok.is(tok::l_square) ||
|
|
PreviousTok.is(tok::question) || PreviousTok.is(tok::colon))
|
|
return TokenAnnotation::TT_UnaryOperator;
|
|
|
|
// There can't be to consecutive binary operators.
|
|
if (Annotations[Index - 1].Type == TokenAnnotation::TT_BinaryOperator)
|
|
return TokenAnnotation::TT_UnaryOperator;
|
|
|
|
// Fall back to marking the token as binary operator.
|
|
return TokenAnnotation::TT_BinaryOperator;
|
|
}
|
|
|
|
/// \brief Determine whether ++/-- are pre- or post-increments/-decrements.
|
|
TokenAnnotation::TokenType determineIncrementUsage(unsigned Index) {
|
|
if (Index != 0 && Line.Tokens[Index - 1].Tok.is(tok::identifier))
|
|
return TokenAnnotation::TT_TrailingUnaryOperator;
|
|
|
|
return TokenAnnotation::TT_UnaryOperator;
|
|
}
|
|
|
|
bool spaceRequiredBetween(Token Left, Token Right) {
|
|
if (Right.is(tok::r_paren) || Right.is(tok::semi) || Right.is(tok::comma))
|
|
return false;
|
|
if (Left.is(tok::kw_template) && Right.is(tok::less))
|
|
return true;
|
|
if (Left.is(tok::arrow) || Right.is(tok::arrow))
|
|
return false;
|
|
if (Left.is(tok::exclaim) || Left.is(tok::tilde))
|
|
return false;
|
|
if (Left.is(tok::at) && Right.is(tok::identifier))
|
|
return false;
|
|
if (Left.is(tok::less) || Right.is(tok::greater) || Right.is(tok::less))
|
|
return false;
|
|
if (Right.is(tok::amp) || Right.is(tok::star))
|
|
return Left.isLiteral() ||
|
|
(Left.isNot(tok::star) && Left.isNot(tok::amp) &&
|
|
!Style.PointerAndReferenceBindToType);
|
|
if (Left.is(tok::amp) || Left.is(tok::star))
|
|
return Right.isLiteral() || Style.PointerAndReferenceBindToType;
|
|
if (Right.is(tok::star) && Left.is(tok::l_paren))
|
|
return false;
|
|
if (Left.is(tok::l_square) || Right.is(tok::l_square) ||
|
|
Right.is(tok::r_square))
|
|
return false;
|
|
if (Left.is(tok::coloncolon) ||
|
|
(Right.is(tok::coloncolon) &&
|
|
(Left.is(tok::identifier) || Left.is(tok::greater))))
|
|
return false;
|
|
if (Left.is(tok::period) || Right.is(tok::period))
|
|
return false;
|
|
if (Left.is(tok::colon) || Right.is(tok::colon))
|
|
return true;
|
|
if (Left.is(tok::l_paren))
|
|
return false;
|
|
if (Left.is(tok::hash))
|
|
return false;
|
|
if (Right.is(tok::l_paren)) {
|
|
return Left.is(tok::kw_if) || Left.is(tok::kw_for) ||
|
|
Left.is(tok::kw_while) || Left.is(tok::kw_switch) ||
|
|
(Left.isNot(tok::identifier) && Left.isNot(tok::kw_sizeof) &&
|
|
Left.isNot(tok::kw_typeof));
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool canBreakBefore(unsigned i) {
|
|
if (Annotations[i - 1].Type == TokenAnnotation::TT_PointerOrReference ||
|
|
Annotations[i].Type == TokenAnnotation::TT_ConditionalExpr) {
|
|
return false;
|
|
}
|
|
const FormatToken &Left = Line.Tokens[i - 1];
|
|
const FormatToken &Right = Line.Tokens[i];
|
|
if (Right.Tok.is(tok::r_paren) || Right.Tok.is(tok::l_brace) ||
|
|
Right.Tok.is(tok::comment) || Right.Tok.is(tok::greater))
|
|
return false;
|
|
return (isBinaryOperator(Left) && Left.Tok.isNot(tok::lessless)) ||
|
|
Left.Tok.is(tok::comma) || Right.Tok.is(tok::lessless) ||
|
|
Right.Tok.is(tok::arrow) || Right.Tok.is(tok::period) ||
|
|
Right.Tok.is(tok::colon) || Left.Tok.is(tok::semi) ||
|
|
Left.Tok.is(tok::l_brace) ||
|
|
(Left.Tok.is(tok::l_paren) && !Right.Tok.is(tok::r_paren));
|
|
}
|
|
|
|
const UnwrappedLine &Line;
|
|
FormatStyle Style;
|
|
SourceManager &SourceMgr;
|
|
std::vector<TokenAnnotation> Annotations;
|
|
};
|
|
|
|
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);
|
|
FormatTok.WhiteSpaceStart = FormatTok.Tok.getLocation();
|
|
|
|
// Consume and record whitespace until we find a significant token.
|
|
while (FormatTok.Tok.is(tok::unknown)) {
|
|
FormatTok.NewlinesBefore += tokenText(FormatTok.Tok).count('\n');
|
|
FormatTok.WhiteSpaceLength += FormatTok.Tok.getLength();
|
|
|
|
if (FormatTok.Tok.is(tok::eof))
|
|
return FormatTok;
|
|
Lex.LexFromRawLexer(FormatTok.Tok);
|
|
}
|
|
|
|
if (FormatTok.Tok.is(tok::raw_identifier)) {
|
|
IdentifierInfo &Info = IdentTable.get(tokenText(FormatTok.Tok));
|
|
FormatTok.Tok.setIdentifierInfo(&Info);
|
|
FormatTok.Tok.setKind(Info.getTokenID());
|
|
}
|
|
|
|
if (FormatTok.Tok.is(tok::greatergreater)) {
|
|
FormatTok.Tok.setKind(tok::greater);
|
|
GreaterStashed = true;
|
|
}
|
|
|
|
return FormatTok;
|
|
}
|
|
|
|
private:
|
|
FormatToken FormatTok;
|
|
bool GreaterStashed;
|
|
Lexer &Lex;
|
|
SourceManager &SourceMgr;
|
|
IdentifierTable IdentTable;
|
|
|
|
/// Returns the text of \c FormatTok.
|
|
StringRef tokenText(Token &Tok) {
|
|
return StringRef(SourceMgr.getCharacterData(Tok.getLocation()),
|
|
Tok.getLength());
|
|
}
|
|
};
|
|
|
|
class Formatter : public UnwrappedLineConsumer {
|
|
public:
|
|
Formatter(const FormatStyle &Style, Lexer &Lex, SourceManager &SourceMgr,
|
|
const std::vector<CharSourceRange> &Ranges)
|
|
: Style(Style), Lex(Lex), SourceMgr(SourceMgr), Ranges(Ranges),
|
|
StructuralError(false) {
|
|
}
|
|
|
|
virtual ~Formatter() {
|
|
}
|
|
|
|
tooling::Replacements format() {
|
|
LexerBasedFormatTokenSource Tokens(Lex, SourceMgr);
|
|
UnwrappedLineParser Parser(Style, Tokens, *this);
|
|
StructuralError = Parser.parse();
|
|
for (std::vector<UnwrappedLine>::iterator I = UnwrappedLines.begin(),
|
|
E = UnwrappedLines.end();
|
|
I != E; ++I)
|
|
formatUnwrappedLine(*I);
|
|
return Replaces;
|
|
}
|
|
|
|
private:
|
|
virtual void consumeUnwrappedLine(const UnwrappedLine &TheLine) {
|
|
UnwrappedLines.push_back(TheLine);
|
|
}
|
|
|
|
void formatUnwrappedLine(const UnwrappedLine &TheLine) {
|
|
if (TheLine.Tokens.size() == 0)
|
|
return;
|
|
|
|
CharSourceRange LineRange =
|
|
CharSourceRange::getTokenRange(TheLine.Tokens.front().Tok.getLocation(),
|
|
TheLine.Tokens.back().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()))
|
|
continue;
|
|
|
|
TokenAnnotator Annotator(TheLine, Style, SourceMgr);
|
|
Annotator.annotate();
|
|
UnwrappedLineFormatter Formatter(Style, SourceMgr, TheLine,
|
|
Annotator.getAnnotations(), Replaces,
|
|
StructuralError);
|
|
Formatter.format();
|
|
return;
|
|
}
|
|
}
|
|
|
|
FormatStyle Style;
|
|
Lexer &Lex;
|
|
SourceManager &SourceMgr;
|
|
tooling::Replacements Replaces;
|
|
std::vector<CharSourceRange> Ranges;
|
|
std::vector<UnwrappedLine> UnwrappedLines;
|
|
bool StructuralError;
|
|
};
|
|
|
|
tooling::Replacements reformat(const FormatStyle &Style, Lexer &Lex,
|
|
SourceManager &SourceMgr,
|
|
std::vector<CharSourceRange> Ranges) {
|
|
Formatter formatter(Style, Lex, SourceMgr, Ranges);
|
|
return formatter.format();
|
|
}
|
|
|
|
} // namespace format
|
|
} // namespace clang
|