forked from OSchip/llvm-project
1450 lines
56 KiB
C++
1450 lines
56 KiB
C++
//===--- UnwrappedLineFormatter.cpp - Format C++ code ---------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "UnwrappedLineFormatter.h"
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#include "NamespaceEndCommentsFixer.h"
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#include "WhitespaceManager.h"
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#include "llvm/Support/Debug.h"
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#include <queue>
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#define DEBUG_TYPE "format-formatter"
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namespace clang {
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namespace format {
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namespace {
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bool startsExternCBlock(const AnnotatedLine &Line) {
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const FormatToken *Next = Line.First->getNextNonComment();
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const FormatToken *NextNext = Next ? Next->getNextNonComment() : nullptr;
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return Line.startsWith(tok::kw_extern) && Next && Next->isStringLiteral() &&
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NextNext && NextNext->is(tok::l_brace);
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}
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/// Tracks the indent level of \c AnnotatedLines across levels.
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///
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/// \c nextLine must be called for each \c AnnotatedLine, after which \c
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/// getIndent() will return the indent for the last line \c nextLine was called
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/// with.
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/// If the line is not formatted (and thus the indent does not change), calling
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/// \c adjustToUnmodifiedLine after the call to \c nextLine will cause
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/// subsequent lines on the same level to be indented at the same level as the
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/// given line.
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class LevelIndentTracker {
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public:
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LevelIndentTracker(const FormatStyle &Style,
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const AdditionalKeywords &Keywords, unsigned StartLevel,
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int AdditionalIndent)
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: Style(Style), Keywords(Keywords), AdditionalIndent(AdditionalIndent) {
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for (unsigned i = 0; i != StartLevel; ++i)
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IndentForLevel.push_back(Style.IndentWidth * i + AdditionalIndent);
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}
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/// Returns the indent for the current line.
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unsigned getIndent() const { return Indent; }
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/// Update the indent state given that \p Line is going to be formatted
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/// next.
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void nextLine(const AnnotatedLine &Line) {
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Offset = getIndentOffset(*Line.First);
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// Update the indent level cache size so that we can rely on it
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// having the right size in adjustToUnmodifiedline.
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while (IndentForLevel.size() <= Line.Level)
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IndentForLevel.push_back(-1);
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if (Line.InPPDirective) {
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unsigned IndentWidth =
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(Style.PPIndentWidth >= 0) ? Style.PPIndentWidth : Style.IndentWidth;
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Indent = Line.Level * IndentWidth + AdditionalIndent;
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} else {
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IndentForLevel.resize(Line.Level + 1);
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Indent = getIndent(Line.Level);
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}
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if (static_cast<int>(Indent) + Offset >= 0)
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Indent += Offset;
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if (Line.First->is(TT_CSharpGenericTypeConstraint))
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Indent = Line.Level * Style.IndentWidth + Style.ContinuationIndentWidth;
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}
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/// Update the indent state given that \p Line indent should be
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/// skipped.
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void skipLine(const AnnotatedLine &Line) {
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while (IndentForLevel.size() <= Line.Level)
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IndentForLevel.push_back(Indent);
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}
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/// Update the level indent to adapt to the given \p Line.
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///
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/// When a line is not formatted, we move the subsequent lines on the same
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/// level to the same indent.
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/// Note that \c nextLine must have been called before this method.
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void adjustToUnmodifiedLine(const AnnotatedLine &Line) {
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unsigned LevelIndent = Line.First->OriginalColumn;
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if (static_cast<int>(LevelIndent) - Offset >= 0)
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LevelIndent -= Offset;
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if ((!Line.First->is(tok::comment) || IndentForLevel[Line.Level] == -1) &&
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!Line.InPPDirective)
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IndentForLevel[Line.Level] = LevelIndent;
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}
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private:
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/// Get the offset of the line relatively to the level.
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///
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/// For example, 'public:' labels in classes are offset by 1 or 2
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/// characters to the left from their level.
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int getIndentOffset(const FormatToken &RootToken) {
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if (Style.Language == FormatStyle::LK_Java || Style.isJavaScript() ||
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Style.isCSharp())
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return 0;
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auto IsAccessModifier = [this, &RootToken]() {
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if (RootToken.isAccessSpecifier(Style.isCpp()))
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return true;
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else if (RootToken.isObjCAccessSpecifier())
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return true;
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// Handle Qt signals.
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else if ((RootToken.isOneOf(Keywords.kw_signals, Keywords.kw_qsignals) &&
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RootToken.Next && RootToken.Next->is(tok::colon)))
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return true;
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else if (RootToken.Next &&
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RootToken.Next->isOneOf(Keywords.kw_slots, Keywords.kw_qslots) &&
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RootToken.Next->Next && RootToken.Next->Next->is(tok::colon))
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return true;
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// Handle malformed access specifier e.g. 'private' without trailing ':'.
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else if (!RootToken.Next && RootToken.isAccessSpecifier(false))
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return true;
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return false;
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};
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if (IsAccessModifier()) {
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// The AccessModifierOffset may be overridden by IndentAccessModifiers,
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// in which case we take a negative value of the IndentWidth to simulate
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// the upper indent level.
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return Style.IndentAccessModifiers ? -Style.IndentWidth
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: Style.AccessModifierOffset;
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}
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return 0;
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}
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/// Get the indent of \p Level from \p IndentForLevel.
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///
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/// \p IndentForLevel must contain the indent for the level \c l
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/// at \p IndentForLevel[l], or a value < 0 if the indent for
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/// that level is unknown.
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unsigned getIndent(unsigned Level) const {
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if (IndentForLevel[Level] != -1)
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return IndentForLevel[Level];
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if (Level == 0)
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return 0;
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return getIndent(Level - 1) + Style.IndentWidth;
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}
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const FormatStyle &Style;
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const AdditionalKeywords &Keywords;
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const unsigned AdditionalIndent;
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/// The indent in characters for each level.
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std::vector<int> IndentForLevel;
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/// Offset of the current line relative to the indent level.
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///
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/// For example, the 'public' keywords is often indented with a negative
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/// offset.
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int Offset = 0;
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/// The current line's indent.
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unsigned Indent = 0;
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};
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const FormatToken *getMatchingNamespaceToken(
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const AnnotatedLine *Line,
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const SmallVectorImpl<AnnotatedLine *> &AnnotatedLines) {
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if (!Line->startsWith(tok::r_brace))
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return nullptr;
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size_t StartLineIndex = Line->MatchingOpeningBlockLineIndex;
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if (StartLineIndex == UnwrappedLine::kInvalidIndex)
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return nullptr;
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assert(StartLineIndex < AnnotatedLines.size());
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return AnnotatedLines[StartLineIndex]->First->getNamespaceToken();
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}
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StringRef getNamespaceTokenText(const AnnotatedLine *Line) {
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const FormatToken *NamespaceToken = Line->First->getNamespaceToken();
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return NamespaceToken ? NamespaceToken->TokenText : StringRef();
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}
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StringRef getMatchingNamespaceTokenText(
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const AnnotatedLine *Line,
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const SmallVectorImpl<AnnotatedLine *> &AnnotatedLines) {
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const FormatToken *NamespaceToken =
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getMatchingNamespaceToken(Line, AnnotatedLines);
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return NamespaceToken ? NamespaceToken->TokenText : StringRef();
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}
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class LineJoiner {
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public:
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LineJoiner(const FormatStyle &Style, const AdditionalKeywords &Keywords,
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const SmallVectorImpl<AnnotatedLine *> &Lines)
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: Style(Style), Keywords(Keywords), End(Lines.end()), Next(Lines.begin()),
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AnnotatedLines(Lines) {}
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/// Returns the next line, merging multiple lines into one if possible.
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const AnnotatedLine *getNextMergedLine(bool DryRun,
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LevelIndentTracker &IndentTracker) {
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if (Next == End)
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return nullptr;
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const AnnotatedLine *Current = *Next;
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IndentTracker.nextLine(*Current);
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unsigned MergedLines = tryFitMultipleLinesInOne(IndentTracker, Next, End);
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if (MergedLines > 0 && Style.ColumnLimit == 0)
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// Disallow line merging if there is a break at the start of one of the
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// input lines.
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for (unsigned i = 0; i < MergedLines; ++i)
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if (Next[i + 1]->First->NewlinesBefore > 0)
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MergedLines = 0;
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if (!DryRun)
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for (unsigned i = 0; i < MergedLines; ++i)
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join(*Next[0], *Next[i + 1]);
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Next = Next + MergedLines + 1;
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return Current;
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}
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private:
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/// Calculates how many lines can be merged into 1 starting at \p I.
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unsigned
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tryFitMultipleLinesInOne(LevelIndentTracker &IndentTracker,
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SmallVectorImpl<AnnotatedLine *>::const_iterator I,
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SmallVectorImpl<AnnotatedLine *>::const_iterator E) {
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const unsigned Indent = IndentTracker.getIndent();
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// Can't join the last line with anything.
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if (I + 1 == E)
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return 0;
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// We can never merge stuff if there are trailing line comments.
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const AnnotatedLine *TheLine = *I;
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if (TheLine->Last->is(TT_LineComment))
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return 0;
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const auto &NextLine = *I[1];
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if (NextLine.Type == LT_Invalid || NextLine.First->MustBreakBefore)
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return 0;
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if (TheLine->InPPDirective &&
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(!NextLine.InPPDirective || NextLine.First->HasUnescapedNewline))
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return 0;
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if (Style.ColumnLimit > 0 && Indent > Style.ColumnLimit)
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return 0;
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unsigned Limit =
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Style.ColumnLimit == 0 ? UINT_MAX : Style.ColumnLimit - Indent;
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// If we already exceed the column limit, we set 'Limit' to 0. The different
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// tryMerge..() functions can then decide whether to still do merging.
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Limit = TheLine->Last->TotalLength > Limit
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? 0
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: Limit - TheLine->Last->TotalLength;
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if (TheLine->Last->is(TT_FunctionLBrace) &&
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TheLine->First == TheLine->Last &&
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!Style.BraceWrapping.SplitEmptyFunction &&
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NextLine.First->is(tok::r_brace))
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return tryMergeSimpleBlock(I, E, Limit);
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const auto *PreviousLine = I != AnnotatedLines.begin() ? I[-1] : nullptr;
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// Handle empty record blocks where the brace has already been wrapped.
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if (PreviousLine && TheLine->Last->is(tok::l_brace) &&
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TheLine->First == TheLine->Last) {
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bool EmptyBlock = NextLine.First->is(tok::r_brace);
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const FormatToken *Tok = PreviousLine->First;
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if (Tok && Tok->is(tok::comment))
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Tok = Tok->getNextNonComment();
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if (Tok && Tok->getNamespaceToken())
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return !Style.BraceWrapping.SplitEmptyNamespace && EmptyBlock
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? tryMergeSimpleBlock(I, E, Limit)
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: 0;
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if (Tok && Tok->is(tok::kw_typedef))
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Tok = Tok->getNextNonComment();
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if (Tok && Tok->isOneOf(tok::kw_class, tok::kw_struct, tok::kw_union,
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tok::kw_extern, Keywords.kw_interface))
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return !Style.BraceWrapping.SplitEmptyRecord && EmptyBlock
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? tryMergeSimpleBlock(I, E, Limit)
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: 0;
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if (Tok && Tok->is(tok::kw_template) &&
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Style.BraceWrapping.SplitEmptyRecord && EmptyBlock)
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return 0;
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}
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auto ShouldMergeShortFunctions = [this, &I, &NextLine, PreviousLine,
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TheLine]() {
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if (Style.AllowShortFunctionsOnASingleLine == FormatStyle::SFS_All)
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return true;
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if (Style.AllowShortFunctionsOnASingleLine >= FormatStyle::SFS_Empty &&
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NextLine.First->is(tok::r_brace))
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return true;
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if (Style.AllowShortFunctionsOnASingleLine &
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FormatStyle::SFS_InlineOnly) {
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// Just checking TheLine->Level != 0 is not enough, because it
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// provokes treating functions inside indented namespaces as short.
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if (Style.isJavaScript() && TheLine->Last->is(TT_FunctionLBrace))
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return true;
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if (TheLine->Level != 0) {
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if (!PreviousLine)
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return false;
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// TODO: Use IndentTracker to avoid loop?
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// Find the last line with lower level.
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auto J = I - 1;
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for (; J != AnnotatedLines.begin(); --J)
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if ((*J)->Level < TheLine->Level)
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break;
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// Check if the found line starts a record.
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for (const FormatToken *RecordTok = (*J)->Last; RecordTok;
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RecordTok = RecordTok->Previous)
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if (RecordTok->is(tok::l_brace))
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return RecordTok->is(TT_RecordLBrace);
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}
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}
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return false;
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};
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bool MergeShortFunctions = ShouldMergeShortFunctions();
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if (Style.CompactNamespaces) {
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if (auto nsToken = TheLine->First->getNamespaceToken()) {
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int i = 0;
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unsigned closingLine = TheLine->MatchingClosingBlockLineIndex - 1;
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for (; I + 1 + i != E &&
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nsToken->TokenText == getNamespaceTokenText(I[i + 1]) &&
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closingLine == I[i + 1]->MatchingClosingBlockLineIndex &&
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I[i + 1]->Last->TotalLength < Limit;
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i++, --closingLine) {
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// No extra indent for compacted namespaces.
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IndentTracker.skipLine(*I[i + 1]);
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Limit -= I[i + 1]->Last->TotalLength;
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}
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return i;
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}
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if (auto nsToken = getMatchingNamespaceToken(TheLine, AnnotatedLines)) {
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int i = 0;
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unsigned openingLine = TheLine->MatchingOpeningBlockLineIndex - 1;
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for (; I + 1 + i != E &&
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nsToken->TokenText ==
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getMatchingNamespaceTokenText(I[i + 1], AnnotatedLines) &&
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openingLine == I[i + 1]->MatchingOpeningBlockLineIndex;
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i++, --openingLine) {
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// No space between consecutive braces.
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I[i + 1]->First->SpacesRequiredBefore = !I[i]->Last->is(tok::r_brace);
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// Indent like the outer-most namespace.
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IndentTracker.nextLine(*I[i + 1]);
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}
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return i;
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}
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}
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// Try to merge a function block with left brace unwrapped.
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if (TheLine->Last->is(TT_FunctionLBrace) && TheLine->First != TheLine->Last)
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return MergeShortFunctions ? tryMergeSimpleBlock(I, E, Limit) : 0;
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// Try to merge a control statement block with left brace unwrapped.
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if (TheLine->Last->is(tok::l_brace) && TheLine->First != TheLine->Last &&
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TheLine->First->isOneOf(tok::kw_if, tok::kw_while, tok::kw_for,
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TT_ForEachMacro)) {
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return Style.AllowShortBlocksOnASingleLine != FormatStyle::SBS_Never
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? tryMergeSimpleBlock(I, E, Limit)
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: 0;
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}
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// Try to merge a control statement block with left brace wrapped.
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if (NextLine.First->is(tok::l_brace)) {
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if ((TheLine->First->isOneOf(tok::kw_if, tok::kw_else, tok::kw_while,
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tok::kw_for, tok::kw_switch, tok::kw_try,
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tok::kw_do, TT_ForEachMacro) ||
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(TheLine->First->is(tok::r_brace) && TheLine->First->Next &&
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TheLine->First->Next->isOneOf(tok::kw_else, tok::kw_catch))) &&
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Style.BraceWrapping.AfterControlStatement ==
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FormatStyle::BWACS_MultiLine) {
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// If possible, merge the next line's wrapped left brace with the
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// current line. Otherwise, leave it on the next line, as this is a
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// multi-line control statement.
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return (Style.ColumnLimit == 0 ||
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TheLine->Last->TotalLength <= Style.ColumnLimit)
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? 1
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: 0;
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}
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if (TheLine->First->isOneOf(tok::kw_if, tok::kw_else, tok::kw_while,
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tok::kw_for, TT_ForEachMacro)) {
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return (Style.BraceWrapping.AfterControlStatement ==
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FormatStyle::BWACS_Always)
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? tryMergeSimpleBlock(I, E, Limit)
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: 0;
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}
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if (TheLine->First->isOneOf(tok::kw_else, tok::kw_catch) &&
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Style.BraceWrapping.AfterControlStatement ==
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FormatStyle::BWACS_MultiLine) {
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// This case if different from the upper BWACS_MultiLine processing
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// in that a preceding r_brace is not on the same line as else/catch
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// most likely because of BeforeElse/BeforeCatch set to true.
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// If the line length doesn't fit ColumnLimit, leave l_brace on the
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// next line to respect the BWACS_MultiLine.
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return (Style.ColumnLimit == 0 ||
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TheLine->Last->TotalLength <= Style.ColumnLimit)
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? 1
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: 0;
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}
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}
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if (PreviousLine && TheLine->First->is(tok::l_brace)) {
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switch (PreviousLine->First->Tok.getKind()) {
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case tok::at:
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// Don't merge block with left brace wrapped after ObjC special blocks.
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if (PreviousLine->First->Next) {
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tok::ObjCKeywordKind kwId =
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PreviousLine->First->Next->Tok.getObjCKeywordID();
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if (kwId == tok::objc_autoreleasepool ||
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kwId == tok::objc_synchronized)
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return 0;
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}
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break;
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case tok::kw_case:
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case tok::kw_default:
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// Don't merge block with left brace wrapped after case labels.
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return 0;
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default:
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break;
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}
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}
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// Don't merge an empty template class or struct if SplitEmptyRecords
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// is defined.
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if (PreviousLine && Style.BraceWrapping.SplitEmptyRecord &&
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TheLine->Last->is(tok::l_brace) && PreviousLine->Last) {
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const FormatToken *Previous = PreviousLine->Last;
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if (Previous) {
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if (Previous->is(tok::comment))
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Previous = Previous->getPreviousNonComment();
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if (Previous) {
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if (Previous->is(tok::greater) && !PreviousLine->InPPDirective)
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return 0;
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if (Previous->is(tok::identifier)) {
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const FormatToken *PreviousPrevious =
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Previous->getPreviousNonComment();
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if (PreviousPrevious &&
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PreviousPrevious->isOneOf(tok::kw_class, tok::kw_struct))
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return 0;
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}
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}
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}
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}
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// Try to merge a block with left brace unwrapped that wasn't yet covered.
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if (TheLine->Last->is(tok::l_brace)) {
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const FormatToken *Tok = TheLine->First;
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bool ShouldMerge = false;
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if (Tok->is(tok::kw_typedef)) {
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Tok = Tok->getNextNonComment();
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assert(Tok);
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}
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if (Tok->isOneOf(tok::kw_class, tok::kw_struct)) {
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ShouldMerge = !Style.BraceWrapping.AfterClass ||
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(NextLine.First->is(tok::r_brace) &&
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!Style.BraceWrapping.SplitEmptyRecord);
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} else if (Tok->is(tok::kw_enum)) {
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ShouldMerge = Style.AllowShortEnumsOnASingleLine;
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} else {
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ShouldMerge = !Style.BraceWrapping.AfterFunction ||
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(NextLine.First->is(tok::r_brace) &&
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!Style.BraceWrapping.SplitEmptyFunction);
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}
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return ShouldMerge ? tryMergeSimpleBlock(I, E, Limit) : 0;
|
|
}
|
|
// Try to merge a function block with left brace wrapped.
|
|
if (NextLine.First->is(TT_FunctionLBrace) &&
|
|
Style.BraceWrapping.AfterFunction) {
|
|
if (NextLine.Last->is(TT_LineComment))
|
|
return 0;
|
|
|
|
// Check for Limit <= 2 to account for the " {".
|
|
if (Limit <= 2 || (Style.ColumnLimit == 0 && containsMustBreak(TheLine)))
|
|
return 0;
|
|
Limit -= 2;
|
|
|
|
unsigned MergedLines = 0;
|
|
if (MergeShortFunctions ||
|
|
(Style.AllowShortFunctionsOnASingleLine >= FormatStyle::SFS_Empty &&
|
|
NextLine.First == NextLine.Last && I + 2 != E &&
|
|
I[2]->First->is(tok::r_brace))) {
|
|
MergedLines = tryMergeSimpleBlock(I + 1, E, Limit);
|
|
// If we managed to merge the block, count the function header, which is
|
|
// on a separate line.
|
|
if (MergedLines > 0)
|
|
++MergedLines;
|
|
}
|
|
return MergedLines;
|
|
}
|
|
auto IsElseLine = [&TheLine]() -> bool {
|
|
const FormatToken *First = TheLine->First;
|
|
if (First->is(tok::kw_else))
|
|
return true;
|
|
|
|
return First->is(tok::r_brace) && First->Next &&
|
|
First->Next->is(tok::kw_else);
|
|
};
|
|
if (TheLine->First->is(tok::kw_if) ||
|
|
(IsElseLine() && (Style.AllowShortIfStatementsOnASingleLine ==
|
|
FormatStyle::SIS_AllIfsAndElse))) {
|
|
return Style.AllowShortIfStatementsOnASingleLine
|
|
? tryMergeSimpleControlStatement(I, E, Limit)
|
|
: 0;
|
|
}
|
|
if (TheLine->First->isOneOf(tok::kw_for, tok::kw_while, tok::kw_do,
|
|
TT_ForEachMacro)) {
|
|
return Style.AllowShortLoopsOnASingleLine
|
|
? tryMergeSimpleControlStatement(I, E, Limit)
|
|
: 0;
|
|
}
|
|
if (TheLine->First->isOneOf(tok::kw_case, tok::kw_default)) {
|
|
return Style.AllowShortCaseLabelsOnASingleLine
|
|
? tryMergeShortCaseLabels(I, E, Limit)
|
|
: 0;
|
|
}
|
|
if (TheLine->InPPDirective &&
|
|
(TheLine->First->HasUnescapedNewline || TheLine->First->IsFirst))
|
|
return tryMergeSimplePPDirective(I, E, Limit);
|
|
return 0;
|
|
}
|
|
|
|
unsigned
|
|
tryMergeSimplePPDirective(SmallVectorImpl<AnnotatedLine *>::const_iterator I,
|
|
SmallVectorImpl<AnnotatedLine *>::const_iterator E,
|
|
unsigned Limit) {
|
|
if (Limit == 0)
|
|
return 0;
|
|
if (I + 2 != E && I[2]->InPPDirective && !I[2]->First->HasUnescapedNewline)
|
|
return 0;
|
|
if (1 + I[1]->Last->TotalLength > Limit)
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
unsigned tryMergeSimpleControlStatement(
|
|
SmallVectorImpl<AnnotatedLine *>::const_iterator I,
|
|
SmallVectorImpl<AnnotatedLine *>::const_iterator E, unsigned Limit) {
|
|
if (Limit == 0)
|
|
return 0;
|
|
if (Style.BraceWrapping.AfterControlStatement ==
|
|
FormatStyle::BWACS_Always &&
|
|
I[1]->First->is(tok::l_brace) &&
|
|
Style.AllowShortBlocksOnASingleLine == FormatStyle::SBS_Never)
|
|
return 0;
|
|
if (I[1]->InPPDirective != (*I)->InPPDirective ||
|
|
(I[1]->InPPDirective && I[1]->First->HasUnescapedNewline))
|
|
return 0;
|
|
Limit = limitConsideringMacros(I + 1, E, Limit);
|
|
AnnotatedLine &Line = **I;
|
|
if (!Line.First->is(tok::kw_do) && !Line.First->is(tok::kw_else) &&
|
|
!Line.Last->is(tok::kw_else) && Line.Last->isNot(tok::r_paren))
|
|
return 0;
|
|
// Only merge `do while` if `do` is the only statement on the line.
|
|
if (Line.First->is(tok::kw_do) && !Line.Last->is(tok::kw_do))
|
|
return 0;
|
|
if (1 + I[1]->Last->TotalLength > Limit)
|
|
return 0;
|
|
// Don't merge with loops, ifs, a single semicolon or a line comment.
|
|
if (I[1]->First->isOneOf(tok::semi, tok::kw_if, tok::kw_for, tok::kw_while,
|
|
TT_ForEachMacro, TT_LineComment))
|
|
return 0;
|
|
// Only inline simple if's (no nested if or else), unless specified
|
|
if (Style.AllowShortIfStatementsOnASingleLine ==
|
|
FormatStyle::SIS_WithoutElse) {
|
|
if (I + 2 != E && Line.startsWith(tok::kw_if) &&
|
|
I[2]->First->is(tok::kw_else))
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
unsigned
|
|
tryMergeShortCaseLabels(SmallVectorImpl<AnnotatedLine *>::const_iterator I,
|
|
SmallVectorImpl<AnnotatedLine *>::const_iterator E,
|
|
unsigned Limit) {
|
|
if (Limit == 0 || I + 1 == E ||
|
|
I[1]->First->isOneOf(tok::kw_case, tok::kw_default))
|
|
return 0;
|
|
if (I[0]->Last->is(tok::l_brace) || I[1]->First->is(tok::l_brace))
|
|
return 0;
|
|
unsigned NumStmts = 0;
|
|
unsigned Length = 0;
|
|
bool EndsWithComment = false;
|
|
bool InPPDirective = I[0]->InPPDirective;
|
|
const unsigned Level = I[0]->Level;
|
|
for (; NumStmts < 3; ++NumStmts) {
|
|
if (I + 1 + NumStmts == E)
|
|
break;
|
|
const AnnotatedLine *Line = I[1 + NumStmts];
|
|
if (Line->InPPDirective != InPPDirective)
|
|
break;
|
|
if (Line->First->isOneOf(tok::kw_case, tok::kw_default, tok::r_brace))
|
|
break;
|
|
if (Line->First->isOneOf(tok::kw_if, tok::kw_for, tok::kw_switch,
|
|
tok::kw_while) ||
|
|
EndsWithComment)
|
|
return 0;
|
|
if (Line->First->is(tok::comment)) {
|
|
if (Level != Line->Level)
|
|
return 0;
|
|
SmallVectorImpl<AnnotatedLine *>::const_iterator J = I + 2 + NumStmts;
|
|
for (; J != E; ++J) {
|
|
Line = *J;
|
|
if (Line->InPPDirective != InPPDirective)
|
|
break;
|
|
if (Line->First->isOneOf(tok::kw_case, tok::kw_default, tok::r_brace))
|
|
break;
|
|
if (Line->First->isNot(tok::comment) || Level != Line->Level)
|
|
return 0;
|
|
}
|
|
break;
|
|
}
|
|
if (Line->Last->is(tok::comment))
|
|
EndsWithComment = true;
|
|
Length += I[1 + NumStmts]->Last->TotalLength + 1; // 1 for the space.
|
|
}
|
|
if (NumStmts == 0 || NumStmts == 3 || Length > Limit)
|
|
return 0;
|
|
return NumStmts;
|
|
}
|
|
|
|
unsigned
|
|
tryMergeSimpleBlock(SmallVectorImpl<AnnotatedLine *>::const_iterator I,
|
|
SmallVectorImpl<AnnotatedLine *>::const_iterator E,
|
|
unsigned Limit) {
|
|
// Don't merge with a preprocessor directive.
|
|
if (I[1]->Type == LT_PreprocessorDirective)
|
|
return 0;
|
|
|
|
AnnotatedLine &Line = **I;
|
|
|
|
// Don't merge ObjC @ keywords and methods.
|
|
// FIXME: If an option to allow short exception handling clauses on a single
|
|
// line is added, change this to not return for @try and friends.
|
|
if (Style.Language != FormatStyle::LK_Java &&
|
|
Line.First->isOneOf(tok::at, tok::minus, tok::plus))
|
|
return 0;
|
|
|
|
// Check that the current line allows merging. This depends on whether we
|
|
// are in a control flow statements as well as several style flags.
|
|
if (Line.First->is(tok::kw_case) ||
|
|
(Line.First->Next && Line.First->Next->is(tok::kw_else)))
|
|
return 0;
|
|
// default: in switch statement
|
|
if (Line.First->is(tok::kw_default)) {
|
|
const FormatToken *Tok = Line.First->getNextNonComment();
|
|
if (Tok && Tok->is(tok::colon))
|
|
return 0;
|
|
}
|
|
if (Line.First->isOneOf(tok::kw_if, tok::kw_else, tok::kw_while, tok::kw_do,
|
|
tok::kw_try, tok::kw___try, tok::kw_catch,
|
|
tok::kw___finally, tok::kw_for, TT_ForEachMacro,
|
|
tok::r_brace, Keywords.kw___except)) {
|
|
if (Style.AllowShortBlocksOnASingleLine == FormatStyle::SBS_Never)
|
|
return 0;
|
|
if (Style.AllowShortBlocksOnASingleLine == FormatStyle::SBS_Empty &&
|
|
!I[1]->First->is(tok::r_brace))
|
|
return 0;
|
|
// Don't merge when we can't except the case when
|
|
// the control statement block is empty
|
|
if (!Style.AllowShortIfStatementsOnASingleLine &&
|
|
Line.First->isOneOf(tok::kw_if, tok::kw_else) &&
|
|
!Style.BraceWrapping.AfterControlStatement &&
|
|
!I[1]->First->is(tok::r_brace))
|
|
return 0;
|
|
if (!Style.AllowShortIfStatementsOnASingleLine &&
|
|
Line.First->isOneOf(tok::kw_if, tok::kw_else) &&
|
|
Style.BraceWrapping.AfterControlStatement ==
|
|
FormatStyle::BWACS_Always &&
|
|
I + 2 != E && !I[2]->First->is(tok::r_brace))
|
|
return 0;
|
|
if (!Style.AllowShortLoopsOnASingleLine &&
|
|
Line.First->isOneOf(tok::kw_while, tok::kw_do, tok::kw_for,
|
|
TT_ForEachMacro) &&
|
|
!Style.BraceWrapping.AfterControlStatement &&
|
|
!I[1]->First->is(tok::r_brace))
|
|
return 0;
|
|
if (!Style.AllowShortLoopsOnASingleLine &&
|
|
Line.First->isOneOf(tok::kw_while, tok::kw_do, tok::kw_for,
|
|
TT_ForEachMacro) &&
|
|
Style.BraceWrapping.AfterControlStatement ==
|
|
FormatStyle::BWACS_Always &&
|
|
I + 2 != E && !I[2]->First->is(tok::r_brace))
|
|
return 0;
|
|
// FIXME: Consider an option to allow short exception handling clauses on
|
|
// a single line.
|
|
// FIXME: This isn't covered by tests.
|
|
// FIXME: For catch, __except, __finally the first token on the line
|
|
// is '}', so this isn't correct here.
|
|
if (Line.First->isOneOf(tok::kw_try, tok::kw___try, tok::kw_catch,
|
|
Keywords.kw___except, tok::kw___finally))
|
|
return 0;
|
|
}
|
|
|
|
if (Line.Last->is(tok::l_brace)) {
|
|
FormatToken *Tok = I[1]->First;
|
|
auto ShouldMerge = [Tok]() {
|
|
if (Tok->isNot(tok::r_brace) || Tok->MustBreakBefore)
|
|
return false;
|
|
const FormatToken *Next = Tok->getNextNonComment();
|
|
return !Next || Next->is(tok::semi);
|
|
};
|
|
if (ShouldMerge()) {
|
|
// We merge empty blocks even if the line exceeds the column limit.
|
|
Tok->SpacesRequiredBefore = Style.SpaceInEmptyBlock ? 1 : 0;
|
|
Tok->CanBreakBefore = true;
|
|
return 1;
|
|
} else if (Limit != 0 && !Line.startsWithNamespace() &&
|
|
!startsExternCBlock(Line)) {
|
|
// We don't merge short records.
|
|
FormatToken *RecordTok = Line.First;
|
|
// Skip record modifiers.
|
|
while (RecordTok->Next &&
|
|
RecordTok->isOneOf(tok::kw_typedef, tok::kw_export,
|
|
Keywords.kw_declare, Keywords.kw_abstract,
|
|
tok::kw_default, Keywords.kw_override,
|
|
tok::kw_public, tok::kw_private,
|
|
tok::kw_protected, Keywords.kw_internal))
|
|
RecordTok = RecordTok->Next;
|
|
if (RecordTok &&
|
|
RecordTok->isOneOf(tok::kw_class, tok::kw_union, tok::kw_struct,
|
|
Keywords.kw_interface))
|
|
return 0;
|
|
|
|
// Check that we still have three lines and they fit into the limit.
|
|
if (I + 2 == E || I[2]->Type == LT_Invalid)
|
|
return 0;
|
|
Limit = limitConsideringMacros(I + 2, E, Limit);
|
|
|
|
if (!nextTwoLinesFitInto(I, Limit))
|
|
return 0;
|
|
|
|
// 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->is(TT_LineComment))
|
|
return 0;
|
|
do {
|
|
if (Tok->is(tok::l_brace) && Tok->isNot(BK_BracedInit))
|
|
return 0;
|
|
Tok = Tok->Next;
|
|
} while (Tok);
|
|
|
|
// Last, check that the third line starts with a closing brace.
|
|
Tok = I[2]->First;
|
|
if (Tok->isNot(tok::r_brace))
|
|
return 0;
|
|
|
|
// Don't merge "if (a) { .. } else {".
|
|
if (Tok->Next && Tok->Next->is(tok::kw_else))
|
|
return 0;
|
|
|
|
// Don't merge a trailing multi-line control statement block like:
|
|
// } else if (foo &&
|
|
// bar)
|
|
// { <-- current Line
|
|
// baz();
|
|
// }
|
|
if (Line.First == Line.Last && Line.First->isNot(TT_FunctionLBrace) &&
|
|
Style.BraceWrapping.AfterControlStatement ==
|
|
FormatStyle::BWACS_MultiLine)
|
|
return 0;
|
|
|
|
return 2;
|
|
}
|
|
} else if (I[1]->First->is(tok::l_brace)) {
|
|
if (I[1]->Last->is(TT_LineComment))
|
|
return 0;
|
|
|
|
// Check for Limit <= 2 to account for the " {".
|
|
if (Limit <= 2 || (Style.ColumnLimit == 0 && containsMustBreak(*I)))
|
|
return 0;
|
|
Limit -= 2;
|
|
unsigned MergedLines = 0;
|
|
if (Style.AllowShortBlocksOnASingleLine != FormatStyle::SBS_Never ||
|
|
(I[1]->First == I[1]->Last && I + 2 != E &&
|
|
I[2]->First->is(tok::r_brace))) {
|
|
MergedLines = tryMergeSimpleBlock(I + 1, E, Limit);
|
|
// If we managed to merge the block, count the statement header, which
|
|
// is on a separate line.
|
|
if (MergedLines > 0)
|
|
++MergedLines;
|
|
}
|
|
return MergedLines;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/// Returns the modified column limit for \p I if it is inside a macro and
|
|
/// needs a trailing '\'.
|
|
unsigned
|
|
limitConsideringMacros(SmallVectorImpl<AnnotatedLine *>::const_iterator I,
|
|
SmallVectorImpl<AnnotatedLine *>::const_iterator E,
|
|
unsigned Limit) {
|
|
if (I[0]->InPPDirective && I + 1 != E &&
|
|
!I[1]->First->HasUnescapedNewline && !I[1]->First->is(tok::eof))
|
|
return Limit < 2 ? 0 : Limit - 2;
|
|
return Limit;
|
|
}
|
|
|
|
bool nextTwoLinesFitInto(SmallVectorImpl<AnnotatedLine *>::const_iterator I,
|
|
unsigned Limit) {
|
|
if (I[1]->First->MustBreakBefore || I[2]->First->MustBreakBefore)
|
|
return false;
|
|
return 1 + I[1]->Last->TotalLength + 1 + I[2]->Last->TotalLength <= Limit;
|
|
}
|
|
|
|
bool containsMustBreak(const AnnotatedLine *Line) {
|
|
for (const FormatToken *Tok = Line->First; Tok; Tok = Tok->Next)
|
|
if (Tok->MustBreakBefore)
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
void join(AnnotatedLine &A, const AnnotatedLine &B) {
|
|
assert(!A.Last->Next);
|
|
assert(!B.First->Previous);
|
|
if (B.Affected)
|
|
A.Affected = true;
|
|
A.Last->Next = B.First;
|
|
B.First->Previous = A.Last;
|
|
B.First->CanBreakBefore = true;
|
|
unsigned LengthA = A.Last->TotalLength + B.First->SpacesRequiredBefore;
|
|
for (FormatToken *Tok = B.First; Tok; Tok = Tok->Next) {
|
|
Tok->TotalLength += LengthA;
|
|
A.Last = Tok;
|
|
}
|
|
}
|
|
|
|
const FormatStyle &Style;
|
|
const AdditionalKeywords &Keywords;
|
|
const SmallVectorImpl<AnnotatedLine *>::const_iterator End;
|
|
|
|
SmallVectorImpl<AnnotatedLine *>::const_iterator Next;
|
|
const SmallVectorImpl<AnnotatedLine *> &AnnotatedLines;
|
|
};
|
|
|
|
static void markFinalized(FormatToken *Tok) {
|
|
for (; Tok; Tok = Tok->Next) {
|
|
Tok->Finalized = true;
|
|
for (AnnotatedLine *Child : Tok->Children)
|
|
markFinalized(Child->First);
|
|
}
|
|
}
|
|
|
|
#ifndef NDEBUG
|
|
static void printLineState(const LineState &State) {
|
|
llvm::dbgs() << "State: ";
|
|
for (const ParenState &P : State.Stack) {
|
|
llvm::dbgs() << (P.Tok ? P.Tok->TokenText : "F") << "|" << P.Indent << "|"
|
|
<< P.LastSpace << "|" << P.NestedBlockIndent << " ";
|
|
}
|
|
llvm::dbgs() << State.NextToken->TokenText << "\n";
|
|
}
|
|
#endif
|
|
|
|
/// Base class for classes that format one \c AnnotatedLine.
|
|
class LineFormatter {
|
|
public:
|
|
LineFormatter(ContinuationIndenter *Indenter, WhitespaceManager *Whitespaces,
|
|
const FormatStyle &Style,
|
|
UnwrappedLineFormatter *BlockFormatter)
|
|
: Indenter(Indenter), Whitespaces(Whitespaces), Style(Style),
|
|
BlockFormatter(BlockFormatter) {}
|
|
virtual ~LineFormatter() {}
|
|
|
|
/// Formats an \c AnnotatedLine and returns the penalty.
|
|
///
|
|
/// If \p DryRun is \c false, directly applies the changes.
|
|
virtual unsigned formatLine(const AnnotatedLine &Line, unsigned FirstIndent,
|
|
unsigned FirstStartColumn, bool DryRun) = 0;
|
|
|
|
protected:
|
|
/// If the \p State's next token is an r_brace closing a nested block,
|
|
/// format the nested block before it.
|
|
///
|
|
/// Returns \c true if all children could be placed successfully and adapts
|
|
/// \p Penalty as well as \p State. If \p DryRun is false, also directly
|
|
/// creates changes using \c Whitespaces.
|
|
///
|
|
/// The crucial idea here is that children always get formatted upon
|
|
/// encountering the closing brace right after the nested block. Now, if we
|
|
/// are currently trying to keep the "}" on the same line (i.e. \p NewLine is
|
|
/// \c false), the entire block has to be kept on the same line (which is only
|
|
/// possible if it fits on the line, only contains a single statement, etc.
|
|
///
|
|
/// If \p NewLine is true, we format the nested block on separate lines, i.e.
|
|
/// break after the "{", format all lines with correct indentation and the put
|
|
/// the closing "}" on yet another new line.
|
|
///
|
|
/// This enables us to keep the simple structure of the
|
|
/// \c UnwrappedLineFormatter, where we only have two options for each token:
|
|
/// break or don't break.
|
|
bool formatChildren(LineState &State, bool NewLine, bool DryRun,
|
|
unsigned &Penalty) {
|
|
const FormatToken *LBrace = State.NextToken->getPreviousNonComment();
|
|
FormatToken &Previous = *State.NextToken->Previous;
|
|
if (!LBrace || LBrace->isNot(tok::l_brace) || LBrace->isNot(BK_Block) ||
|
|
Previous.Children.size() == 0)
|
|
// The previous token does not open a block. Nothing to do. We don't
|
|
// assert so that we can simply call this function for all tokens.
|
|
return true;
|
|
|
|
if (NewLine) {
|
|
const ParenState &P = State.Stack.back();
|
|
|
|
int AdditionalIndent =
|
|
P.Indent - Previous.Children[0]->Level * Style.IndentWidth;
|
|
|
|
if (Style.LambdaBodyIndentation == FormatStyle::LBI_OuterScope &&
|
|
P.NestedBlockIndent == P.LastSpace) {
|
|
if (State.NextToken->MatchingParen &&
|
|
State.NextToken->MatchingParen->is(TT_LambdaLBrace))
|
|
State.Stack.pop_back();
|
|
if (LBrace->is(TT_LambdaLBrace))
|
|
AdditionalIndent = 0;
|
|
}
|
|
|
|
Penalty +=
|
|
BlockFormatter->format(Previous.Children, DryRun, AdditionalIndent,
|
|
/*FixBadIndentation=*/true);
|
|
return true;
|
|
}
|
|
|
|
if (Previous.Children[0]->First->MustBreakBefore)
|
|
return false;
|
|
|
|
// Cannot merge into one line if this line ends on a comment.
|
|
if (Previous.is(tok::comment))
|
|
return false;
|
|
|
|
// Cannot merge multiple statements into a single line.
|
|
if (Previous.Children.size() > 1)
|
|
return false;
|
|
|
|
const AnnotatedLine *Child = Previous.Children[0];
|
|
// We can't put the closing "}" on a line with a trailing comment.
|
|
if (Child->Last->isTrailingComment())
|
|
return false;
|
|
|
|
// If the child line exceeds the column limit, we wouldn't want to merge it.
|
|
// We add +2 for the trailing " }".
|
|
if (Style.ColumnLimit > 0 &&
|
|
Child->Last->TotalLength + State.Column + 2 > Style.ColumnLimit)
|
|
return false;
|
|
|
|
if (!DryRun) {
|
|
Whitespaces->replaceWhitespace(
|
|
*Child->First, /*Newlines=*/0, /*Spaces=*/1,
|
|
/*StartOfTokenColumn=*/State.Column, /*IsAligned=*/false,
|
|
State.Line->InPPDirective);
|
|
}
|
|
Penalty +=
|
|
formatLine(*Child, State.Column + 1, /*FirstStartColumn=*/0, DryRun);
|
|
|
|
State.Column += 1 + Child->Last->TotalLength;
|
|
return true;
|
|
}
|
|
|
|
ContinuationIndenter *Indenter;
|
|
|
|
private:
|
|
WhitespaceManager *Whitespaces;
|
|
const FormatStyle &Style;
|
|
UnwrappedLineFormatter *BlockFormatter;
|
|
};
|
|
|
|
/// Formatter that keeps the existing line breaks.
|
|
class NoColumnLimitLineFormatter : public LineFormatter {
|
|
public:
|
|
NoColumnLimitLineFormatter(ContinuationIndenter *Indenter,
|
|
WhitespaceManager *Whitespaces,
|
|
const FormatStyle &Style,
|
|
UnwrappedLineFormatter *BlockFormatter)
|
|
: LineFormatter(Indenter, Whitespaces, Style, BlockFormatter) {}
|
|
|
|
/// Formats the line, simply keeping all of the input's line breaking
|
|
/// decisions.
|
|
unsigned formatLine(const AnnotatedLine &Line, unsigned FirstIndent,
|
|
unsigned FirstStartColumn, bool DryRun) override {
|
|
assert(!DryRun);
|
|
LineState State = Indenter->getInitialState(FirstIndent, FirstStartColumn,
|
|
&Line, /*DryRun=*/false);
|
|
while (State.NextToken) {
|
|
bool Newline =
|
|
Indenter->mustBreak(State) ||
|
|
(Indenter->canBreak(State) && State.NextToken->NewlinesBefore > 0);
|
|
unsigned Penalty = 0;
|
|
formatChildren(State, Newline, /*DryRun=*/false, Penalty);
|
|
Indenter->addTokenToState(State, Newline, /*DryRun=*/false);
|
|
}
|
|
return 0;
|
|
}
|
|
};
|
|
|
|
/// Formatter that puts all tokens into a single line without breaks.
|
|
class NoLineBreakFormatter : public LineFormatter {
|
|
public:
|
|
NoLineBreakFormatter(ContinuationIndenter *Indenter,
|
|
WhitespaceManager *Whitespaces, const FormatStyle &Style,
|
|
UnwrappedLineFormatter *BlockFormatter)
|
|
: LineFormatter(Indenter, Whitespaces, Style, BlockFormatter) {}
|
|
|
|
/// Puts all tokens into a single line.
|
|
unsigned formatLine(const AnnotatedLine &Line, unsigned FirstIndent,
|
|
unsigned FirstStartColumn, bool DryRun) override {
|
|
unsigned Penalty = 0;
|
|
LineState State =
|
|
Indenter->getInitialState(FirstIndent, FirstStartColumn, &Line, DryRun);
|
|
while (State.NextToken) {
|
|
formatChildren(State, /*NewLine=*/false, DryRun, Penalty);
|
|
Indenter->addTokenToState(
|
|
State, /*Newline=*/State.NextToken->MustBreakBefore, DryRun);
|
|
}
|
|
return Penalty;
|
|
}
|
|
};
|
|
|
|
/// Finds the best way to break lines.
|
|
class OptimizingLineFormatter : public LineFormatter {
|
|
public:
|
|
OptimizingLineFormatter(ContinuationIndenter *Indenter,
|
|
WhitespaceManager *Whitespaces,
|
|
const FormatStyle &Style,
|
|
UnwrappedLineFormatter *BlockFormatter)
|
|
: LineFormatter(Indenter, Whitespaces, Style, BlockFormatter) {}
|
|
|
|
/// Formats the line by finding the best line breaks with line lengths
|
|
/// below the column limit.
|
|
unsigned formatLine(const AnnotatedLine &Line, unsigned FirstIndent,
|
|
unsigned FirstStartColumn, bool DryRun) override {
|
|
LineState State =
|
|
Indenter->getInitialState(FirstIndent, FirstStartColumn, &Line, DryRun);
|
|
|
|
// If the ObjC method declaration does not fit on a line, we should format
|
|
// it with one arg per line.
|
|
if (State.Line->Type == LT_ObjCMethodDecl)
|
|
State.Stack.back().BreakBeforeParameter = true;
|
|
|
|
// Find best solution in solution space.
|
|
return analyzeSolutionSpace(State, DryRun);
|
|
}
|
|
|
|
private:
|
|
struct CompareLineStatePointers {
|
|
bool operator()(LineState *obj1, LineState *obj2) const {
|
|
return *obj1 < *obj2;
|
|
}
|
|
};
|
|
|
|
/// 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;
|
|
|
|
/// 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;
|
|
};
|
|
|
|
/// 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;
|
|
|
|
/// The BFS queue type.
|
|
typedef std::priority_queue<QueueItem, std::vector<QueueItem>,
|
|
std::greater<QueueItem>>
|
|
QueueType;
|
|
|
|
/// 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. Returns the penalty.
|
|
///
|
|
/// If \p DryRun is \c false, directly applies the changes.
|
|
unsigned analyzeSolutionSpace(LineState &InitialState, bool DryRun) {
|
|
std::set<LineState *, CompareLineStatePointers> Seen;
|
|
|
|
// Increasing count of \c StateNode items we have created. This is used to
|
|
// create a deterministic order independent of the container.
|
|
unsigned Count = 0;
|
|
QueueType Queue;
|
|
|
|
// Insert start element into queue.
|
|
StateNode *RootNode =
|
|
new (Allocator.Allocate()) StateNode(InitialState, false, nullptr);
|
|
Queue.push(QueueItem(OrderedPenalty(0, Count), RootNode));
|
|
++Count;
|
|
|
|
unsigned Penalty = 0;
|
|
|
|
// While not empty, take first element and follow edges.
|
|
while (!Queue.empty()) {
|
|
Penalty = Queue.top().first.first;
|
|
StateNode *Node = Queue.top().second;
|
|
if (!Node->State.NextToken) {
|
|
LLVM_DEBUG(llvm::dbgs()
|
|
<< "\n---\nPenalty for line: " << Penalty << "\n");
|
|
break;
|
|
}
|
|
Queue.pop();
|
|
|
|
// Cut off the analysis of certain solutions if the analysis gets too
|
|
// complex. See description of IgnoreStackForComparison.
|
|
if (Count > 50000)
|
|
Node->State.IgnoreStackForComparison = true;
|
|
|
|
if (!Seen.insert(&Node->State).second)
|
|
// State already examined with lower penalty.
|
|
continue;
|
|
|
|
FormatDecision LastFormat = Node->State.NextToken->getDecision();
|
|
if (LastFormat == FD_Unformatted || LastFormat == FD_Continue)
|
|
addNextStateToQueue(Penalty, Node, /*NewLine=*/false, &Count, &Queue);
|
|
if (LastFormat == FD_Unformatted || LastFormat == FD_Break)
|
|
addNextStateToQueue(Penalty, Node, /*NewLine=*/true, &Count, &Queue);
|
|
}
|
|
|
|
if (Queue.empty()) {
|
|
// We were unable to find a solution, do nothing.
|
|
// FIXME: Add diagnostic?
|
|
LLVM_DEBUG(llvm::dbgs() << "Could not find a solution.\n");
|
|
return 0;
|
|
}
|
|
|
|
// Reconstruct the solution.
|
|
if (!DryRun)
|
|
reconstructPath(InitialState, Queue.top().second);
|
|
|
|
LLVM_DEBUG(llvm::dbgs()
|
|
<< "Total number of analyzed states: " << Count << "\n");
|
|
LLVM_DEBUG(llvm::dbgs() << "---\n");
|
|
|
|
return Penalty;
|
|
}
|
|
|
|
/// 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, unsigned *Count, QueueType *Queue) {
|
|
if (NewLine && !Indenter->canBreak(PreviousNode->State))
|
|
return;
|
|
if (!NewLine && Indenter->mustBreak(PreviousNode->State))
|
|
return;
|
|
|
|
StateNode *Node = new (Allocator.Allocate())
|
|
StateNode(PreviousNode->State, NewLine, PreviousNode);
|
|
if (!formatChildren(Node->State, NewLine, /*DryRun=*/true, Penalty))
|
|
return;
|
|
|
|
Penalty += Indenter->addTokenToState(Node->State, NewLine, true);
|
|
|
|
Queue->push(QueueItem(OrderedPenalty(Penalty, *Count), Node));
|
|
++(*Count);
|
|
}
|
|
|
|
/// Applies the best formatting by reconstructing the path in the
|
|
/// solution space that leads to \c Best.
|
|
void reconstructPath(LineState &State, StateNode *Best) {
|
|
llvm::SmallVector<StateNode *> Path;
|
|
// We do not need a break before the initial token.
|
|
while (Best->Previous) {
|
|
Path.push_back(Best);
|
|
Best = Best->Previous;
|
|
}
|
|
for (const auto &Node : llvm::reverse(Path)) {
|
|
unsigned Penalty = 0;
|
|
formatChildren(State, Node->NewLine, /*DryRun=*/false, Penalty);
|
|
Penalty += Indenter->addTokenToState(State, Node->NewLine, false);
|
|
|
|
LLVM_DEBUG({
|
|
printLineState(Node->Previous->State);
|
|
if (Node->NewLine)
|
|
llvm::dbgs() << "Penalty for placing "
|
|
<< Node->Previous->State.NextToken->Tok.getName()
|
|
<< " on a new line: " << Penalty << "\n";
|
|
});
|
|
}
|
|
}
|
|
|
|
llvm::SpecificBumpPtrAllocator<StateNode> Allocator;
|
|
};
|
|
|
|
} // anonymous namespace
|
|
|
|
unsigned UnwrappedLineFormatter::format(
|
|
const SmallVectorImpl<AnnotatedLine *> &Lines, bool DryRun,
|
|
int AdditionalIndent, bool FixBadIndentation, unsigned FirstStartColumn,
|
|
unsigned NextStartColumn, unsigned LastStartColumn) {
|
|
LineJoiner Joiner(Style, Keywords, Lines);
|
|
|
|
// Try to look up already computed penalty in DryRun-mode.
|
|
std::pair<const SmallVectorImpl<AnnotatedLine *> *, unsigned> CacheKey(
|
|
&Lines, AdditionalIndent);
|
|
auto CacheIt = PenaltyCache.find(CacheKey);
|
|
if (DryRun && CacheIt != PenaltyCache.end())
|
|
return CacheIt->second;
|
|
|
|
assert(!Lines.empty());
|
|
unsigned Penalty = 0;
|
|
LevelIndentTracker IndentTracker(Style, Keywords, Lines[0]->Level,
|
|
AdditionalIndent);
|
|
const AnnotatedLine *PrevPrevLine = nullptr;
|
|
const AnnotatedLine *PreviousLine = nullptr;
|
|
const AnnotatedLine *NextLine = nullptr;
|
|
|
|
// The minimum level of consecutive lines that have been formatted.
|
|
unsigned RangeMinLevel = UINT_MAX;
|
|
|
|
bool FirstLine = true;
|
|
for (const AnnotatedLine *Line =
|
|
Joiner.getNextMergedLine(DryRun, IndentTracker);
|
|
Line; PrevPrevLine = PreviousLine, PreviousLine = Line, Line = NextLine,
|
|
FirstLine = false) {
|
|
assert(Line->First);
|
|
const AnnotatedLine &TheLine = *Line;
|
|
unsigned Indent = IndentTracker.getIndent();
|
|
|
|
// We continue formatting unchanged lines to adjust their indent, e.g. if a
|
|
// scope was added. However, we need to carefully stop doing this when we
|
|
// exit the scope of affected lines to prevent indenting a the entire
|
|
// remaining file if it currently missing a closing brace.
|
|
bool PreviousRBrace =
|
|
PreviousLine && PreviousLine->startsWith(tok::r_brace);
|
|
bool ContinueFormatting =
|
|
TheLine.Level > RangeMinLevel ||
|
|
(TheLine.Level == RangeMinLevel && !PreviousRBrace &&
|
|
!TheLine.startsWith(tok::r_brace));
|
|
|
|
bool FixIndentation = (FixBadIndentation || ContinueFormatting) &&
|
|
Indent != TheLine.First->OriginalColumn;
|
|
bool ShouldFormat = TheLine.Affected || FixIndentation;
|
|
// We cannot format this line; if the reason is that the line had a
|
|
// parsing error, remember that.
|
|
if (ShouldFormat && TheLine.Type == LT_Invalid && Status) {
|
|
Status->FormatComplete = false;
|
|
Status->Line =
|
|
SourceMgr.getSpellingLineNumber(TheLine.First->Tok.getLocation());
|
|
}
|
|
|
|
if (ShouldFormat && TheLine.Type != LT_Invalid) {
|
|
if (!DryRun) {
|
|
bool LastLine = TheLine.First->is(tok::eof);
|
|
formatFirstToken(TheLine, PreviousLine, PrevPrevLine, Lines, Indent,
|
|
LastLine ? LastStartColumn : NextStartColumn + Indent);
|
|
}
|
|
|
|
NextLine = Joiner.getNextMergedLine(DryRun, IndentTracker);
|
|
unsigned ColumnLimit = getColumnLimit(TheLine.InPPDirective, NextLine);
|
|
bool FitsIntoOneLine =
|
|
TheLine.Last->TotalLength + Indent <= ColumnLimit ||
|
|
(TheLine.Type == LT_ImportStatement &&
|
|
(!Style.isJavaScript() || !Style.JavaScriptWrapImports)) ||
|
|
(Style.isCSharp() &&
|
|
TheLine.InPPDirective); // don't split #regions in C#
|
|
if (Style.ColumnLimit == 0)
|
|
NoColumnLimitLineFormatter(Indenter, Whitespaces, Style, this)
|
|
.formatLine(TheLine, NextStartColumn + Indent,
|
|
FirstLine ? FirstStartColumn : 0, DryRun);
|
|
else if (FitsIntoOneLine)
|
|
Penalty += NoLineBreakFormatter(Indenter, Whitespaces, Style, this)
|
|
.formatLine(TheLine, NextStartColumn + Indent,
|
|
FirstLine ? FirstStartColumn : 0, DryRun);
|
|
else
|
|
Penalty += OptimizingLineFormatter(Indenter, Whitespaces, Style, this)
|
|
.formatLine(TheLine, NextStartColumn + Indent,
|
|
FirstLine ? FirstStartColumn : 0, DryRun);
|
|
RangeMinLevel = std::min(RangeMinLevel, TheLine.Level);
|
|
} else {
|
|
// If no token in the current line is affected, we still need to format
|
|
// affected children.
|
|
if (TheLine.ChildrenAffected)
|
|
for (const FormatToken *Tok = TheLine.First; Tok; Tok = Tok->Next)
|
|
if (!Tok->Children.empty())
|
|
format(Tok->Children, DryRun);
|
|
|
|
// Adapt following lines on the current indent level to the same level
|
|
// unless the current \c AnnotatedLine is not at the beginning of a line.
|
|
bool StartsNewLine =
|
|
TheLine.First->NewlinesBefore > 0 || TheLine.First->IsFirst;
|
|
if (StartsNewLine)
|
|
IndentTracker.adjustToUnmodifiedLine(TheLine);
|
|
if (!DryRun) {
|
|
bool ReformatLeadingWhitespace =
|
|
StartsNewLine && ((PreviousLine && PreviousLine->Affected) ||
|
|
TheLine.LeadingEmptyLinesAffected);
|
|
// Format the first token.
|
|
if (ReformatLeadingWhitespace)
|
|
formatFirstToken(TheLine, PreviousLine, PrevPrevLine, Lines,
|
|
TheLine.First->OriginalColumn,
|
|
TheLine.First->OriginalColumn);
|
|
else
|
|
Whitespaces->addUntouchableToken(*TheLine.First,
|
|
TheLine.InPPDirective);
|
|
|
|
// Notify the WhitespaceManager about the unchanged whitespace.
|
|
for (FormatToken *Tok = TheLine.First->Next; Tok; Tok = Tok->Next)
|
|
Whitespaces->addUntouchableToken(*Tok, TheLine.InPPDirective);
|
|
}
|
|
NextLine = Joiner.getNextMergedLine(DryRun, IndentTracker);
|
|
RangeMinLevel = UINT_MAX;
|
|
}
|
|
if (!DryRun)
|
|
markFinalized(TheLine.First);
|
|
}
|
|
PenaltyCache[CacheKey] = Penalty;
|
|
return Penalty;
|
|
}
|
|
|
|
void UnwrappedLineFormatter::formatFirstToken(
|
|
const AnnotatedLine &Line, const AnnotatedLine *PreviousLine,
|
|
const AnnotatedLine *PrevPrevLine,
|
|
const SmallVectorImpl<AnnotatedLine *> &Lines, unsigned Indent,
|
|
unsigned NewlineIndent) {
|
|
FormatToken &RootToken = *Line.First;
|
|
if (RootToken.is(tok::eof)) {
|
|
unsigned Newlines = std::min(RootToken.NewlinesBefore, 1u);
|
|
unsigned TokenIndent = Newlines ? NewlineIndent : 0;
|
|
Whitespaces->replaceWhitespace(RootToken, Newlines, TokenIndent,
|
|
TokenIndent);
|
|
return;
|
|
}
|
|
unsigned Newlines =
|
|
std::min(RootToken.NewlinesBefore, Style.MaxEmptyLinesToKeep + 1);
|
|
// Remove empty lines before "}" where applicable.
|
|
if (RootToken.is(tok::r_brace) &&
|
|
(!RootToken.Next ||
|
|
(RootToken.Next->is(tok::semi) && !RootToken.Next->Next)) &&
|
|
// Do not remove empty lines before namespace closing "}".
|
|
!getNamespaceToken(&Line, Lines))
|
|
Newlines = std::min(Newlines, 1u);
|
|
// Remove empty lines at the start of nested blocks (lambdas/arrow functions)
|
|
if (PreviousLine == nullptr && Line.Level > 0)
|
|
Newlines = std::min(Newlines, 1u);
|
|
if (Newlines == 0 && !RootToken.IsFirst)
|
|
Newlines = 1;
|
|
if (RootToken.IsFirst && !RootToken.HasUnescapedNewline)
|
|
Newlines = 0;
|
|
|
|
// Remove empty lines after "{".
|
|
if (!Style.KeepEmptyLinesAtTheStartOfBlocks && PreviousLine &&
|
|
PreviousLine->Last->is(tok::l_brace) &&
|
|
!PreviousLine->startsWithNamespace() &&
|
|
!(PrevPrevLine && PrevPrevLine->startsWithNamespace() &&
|
|
PreviousLine->startsWith(tok::l_brace)) &&
|
|
!startsExternCBlock(*PreviousLine))
|
|
Newlines = 1;
|
|
|
|
// Insert or remove empty line before access specifiers.
|
|
if (PreviousLine && RootToken.isAccessSpecifier()) {
|
|
switch (Style.EmptyLineBeforeAccessModifier) {
|
|
case FormatStyle::ELBAMS_Never:
|
|
if (Newlines > 1)
|
|
Newlines = 1;
|
|
break;
|
|
case FormatStyle::ELBAMS_Leave:
|
|
Newlines = std::max(RootToken.NewlinesBefore, 1u);
|
|
break;
|
|
case FormatStyle::ELBAMS_LogicalBlock:
|
|
if (PreviousLine->Last->isOneOf(tok::semi, tok::r_brace) && Newlines <= 1)
|
|
Newlines = 2;
|
|
if (PreviousLine->First->isAccessSpecifier())
|
|
Newlines = 1; // Previous is an access modifier remove all new lines.
|
|
break;
|
|
case FormatStyle::ELBAMS_Always: {
|
|
const FormatToken *previousToken;
|
|
if (PreviousLine->Last->is(tok::comment))
|
|
previousToken = PreviousLine->Last->getPreviousNonComment();
|
|
else
|
|
previousToken = PreviousLine->Last;
|
|
if ((!previousToken || !previousToken->is(tok::l_brace)) && Newlines <= 1)
|
|
Newlines = 2;
|
|
} break;
|
|
}
|
|
}
|
|
|
|
// Insert or remove empty line after access specifiers.
|
|
if (PreviousLine && PreviousLine->First->isAccessSpecifier() &&
|
|
(!PreviousLine->InPPDirective || !RootToken.HasUnescapedNewline)) {
|
|
// EmptyLineBeforeAccessModifier is handling the case when two access
|
|
// modifiers follow each other.
|
|
if (!RootToken.isAccessSpecifier()) {
|
|
switch (Style.EmptyLineAfterAccessModifier) {
|
|
case FormatStyle::ELAAMS_Never:
|
|
Newlines = 1;
|
|
break;
|
|
case FormatStyle::ELAAMS_Leave:
|
|
Newlines = std::max(Newlines, 1u);
|
|
break;
|
|
case FormatStyle::ELAAMS_Always:
|
|
if (RootToken.is(tok::r_brace)) // Do not add at end of class.
|
|
Newlines = 1u;
|
|
else
|
|
Newlines = std::max(Newlines, 2u);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (Newlines)
|
|
Indent = NewlineIndent;
|
|
|
|
// Preprocessor directives get indented before the hash only if specified
|
|
if (Style.IndentPPDirectives != FormatStyle::PPDIS_BeforeHash &&
|
|
(Line.Type == LT_PreprocessorDirective ||
|
|
Line.Type == LT_ImportStatement))
|
|
Indent = 0;
|
|
|
|
Whitespaces->replaceWhitespace(RootToken, Newlines, Indent, Indent,
|
|
/*IsAligned=*/false,
|
|
Line.InPPDirective &&
|
|
!RootToken.HasUnescapedNewline);
|
|
}
|
|
|
|
unsigned
|
|
UnwrappedLineFormatter::getColumnLimit(bool InPPDirective,
|
|
const AnnotatedLine *NextLine) const {
|
|
// In preprocessor directives reserve two chars for trailing " \" if the
|
|
// next line continues the preprocessor directive.
|
|
bool ContinuesPPDirective =
|
|
InPPDirective &&
|
|
// If there is no next line, this is likely a child line and the parent
|
|
// continues the preprocessor directive.
|
|
(!NextLine ||
|
|
(NextLine->InPPDirective &&
|
|
// If there is an unescaped newline between this line and the next, the
|
|
// next line starts a new preprocessor directive.
|
|
!NextLine->First->HasUnescapedNewline));
|
|
return Style.ColumnLimit - (ContinuesPPDirective ? 2 : 0);
|
|
}
|
|
|
|
} // namespace format
|
|
} // namespace clang
|