forked from OSchip/llvm-project
973 lines
42 KiB
C++
973 lines
42 KiB
C++
//===--- BreakableToken.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 Contains implementation of BreakableToken class and classes derived
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/// from it.
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///
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//===----------------------------------------------------------------------===//
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#include "BreakableToken.h"
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#include "ContinuationIndenter.h"
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#include "clang/Basic/CharInfo.h"
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#include "clang/Format/Format.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/Support/Debug.h"
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#include <algorithm>
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#define DEBUG_TYPE "format-token-breaker"
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namespace clang {
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namespace format {
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static const char *const Blanks = " \t\v\f\r";
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static bool IsBlank(char C) {
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switch (C) {
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case ' ':
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case '\t':
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case '\v':
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case '\f':
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case '\r':
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return true;
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default:
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return false;
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}
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}
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static StringRef getLineCommentIndentPrefix(StringRef Comment,
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const FormatStyle &Style) {
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static const char *const KnownCStylePrefixes[] = {"///<", "//!<", "///", "//",
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"//!"};
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static const char *const KnownTextProtoPrefixes[] = {"//", "#"};
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ArrayRef<const char *> KnownPrefixes(KnownCStylePrefixes);
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if (Style.Language == FormatStyle::LK_TextProto)
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KnownPrefixes = KnownTextProtoPrefixes;
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StringRef LongestPrefix;
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for (StringRef KnownPrefix : KnownPrefixes) {
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if (Comment.startswith(KnownPrefix)) {
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size_t PrefixLength = KnownPrefix.size();
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while (PrefixLength < Comment.size() && Comment[PrefixLength] == ' ')
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++PrefixLength;
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if (PrefixLength > LongestPrefix.size())
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LongestPrefix = Comment.substr(0, PrefixLength);
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}
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}
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return LongestPrefix;
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}
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static BreakableToken::Split getCommentSplit(StringRef Text,
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unsigned ContentStartColumn,
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unsigned ColumnLimit,
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unsigned TabWidth,
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encoding::Encoding Encoding) {
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if (ColumnLimit <= ContentStartColumn + 1)
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return BreakableToken::Split(StringRef::npos, 0);
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unsigned MaxSplit = ColumnLimit - ContentStartColumn + 1;
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unsigned MaxSplitBytes = 0;
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for (unsigned NumChars = 0;
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NumChars < MaxSplit && MaxSplitBytes < Text.size();) {
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unsigned BytesInChar =
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encoding::getCodePointNumBytes(Text[MaxSplitBytes], Encoding);
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NumChars +=
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encoding::columnWidthWithTabs(Text.substr(MaxSplitBytes, BytesInChar),
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ContentStartColumn, TabWidth, Encoding);
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MaxSplitBytes += BytesInChar;
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}
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StringRef::size_type SpaceOffset = Text.find_last_of(Blanks, MaxSplitBytes);
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// Do not split before a number followed by a dot: this would be interpreted
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// as a numbered list, which would prevent re-flowing in subsequent passes.
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static llvm::Regex kNumberedListRegexp = llvm::Regex("^[1-9][0-9]?\\.");
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if (SpaceOffset != StringRef::npos &&
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kNumberedListRegexp.match(Text.substr(SpaceOffset).ltrim(Blanks)))
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SpaceOffset = Text.find_last_of(Blanks, SpaceOffset);
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if (SpaceOffset == StringRef::npos ||
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// Don't break at leading whitespace.
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Text.find_last_not_of(Blanks, SpaceOffset) == StringRef::npos) {
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// Make sure that we don't break at leading whitespace that
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// reaches past MaxSplit.
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StringRef::size_type FirstNonWhitespace = Text.find_first_not_of(Blanks);
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if (FirstNonWhitespace == StringRef::npos)
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// If the comment is only whitespace, we cannot split.
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return BreakableToken::Split(StringRef::npos, 0);
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SpaceOffset = Text.find_first_of(
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Blanks, std::max<unsigned>(MaxSplitBytes, FirstNonWhitespace));
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}
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if (SpaceOffset != StringRef::npos && SpaceOffset != 0) {
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StringRef BeforeCut = Text.substr(0, SpaceOffset).rtrim(Blanks);
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StringRef AfterCut = Text.substr(SpaceOffset).ltrim(Blanks);
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return BreakableToken::Split(BeforeCut.size(),
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AfterCut.begin() - BeforeCut.end());
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}
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return BreakableToken::Split(StringRef::npos, 0);
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}
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static BreakableToken::Split
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getStringSplit(StringRef Text, unsigned UsedColumns, unsigned ColumnLimit,
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unsigned TabWidth, encoding::Encoding Encoding) {
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// FIXME: Reduce unit test case.
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if (Text.empty())
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return BreakableToken::Split(StringRef::npos, 0);
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if (ColumnLimit <= UsedColumns)
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return BreakableToken::Split(StringRef::npos, 0);
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unsigned MaxSplit = ColumnLimit - UsedColumns;
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StringRef::size_type SpaceOffset = 0;
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StringRef::size_type SlashOffset = 0;
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StringRef::size_type WordStartOffset = 0;
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StringRef::size_type SplitPoint = 0;
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for (unsigned Chars = 0;;) {
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unsigned Advance;
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if (Text[0] == '\\') {
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Advance = encoding::getEscapeSequenceLength(Text);
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Chars += Advance;
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} else {
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Advance = encoding::getCodePointNumBytes(Text[0], Encoding);
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Chars += encoding::columnWidthWithTabs(
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Text.substr(0, Advance), UsedColumns + Chars, TabWidth, Encoding);
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}
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if (Chars > MaxSplit || Text.size() <= Advance)
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break;
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if (IsBlank(Text[0]))
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SpaceOffset = SplitPoint;
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if (Text[0] == '/')
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SlashOffset = SplitPoint;
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if (Advance == 1 && !isAlphanumeric(Text[0]))
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WordStartOffset = SplitPoint;
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SplitPoint += Advance;
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Text = Text.substr(Advance);
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}
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if (SpaceOffset != 0)
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return BreakableToken::Split(SpaceOffset + 1, 0);
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if (SlashOffset != 0)
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return BreakableToken::Split(SlashOffset + 1, 0);
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if (WordStartOffset != 0)
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return BreakableToken::Split(WordStartOffset + 1, 0);
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if (SplitPoint != 0)
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return BreakableToken::Split(SplitPoint, 0);
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return BreakableToken::Split(StringRef::npos, 0);
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}
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bool switchesFormatting(const FormatToken &Token) {
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assert((Token.is(TT_BlockComment) || Token.is(TT_LineComment)) &&
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"formatting regions are switched by comment tokens");
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StringRef Content = Token.TokenText.substr(2).ltrim();
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return Content.startswith("clang-format on") ||
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Content.startswith("clang-format off");
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}
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unsigned
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BreakableToken::getLineLengthAfterCompression(unsigned RemainingTokenColumns,
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Split Split) const {
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// Example: consider the content
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// lala lala
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// - RemainingTokenColumns is the original number of columns, 10;
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// - Split is (4, 2), denoting the two spaces between the two words;
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//
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// We compute the number of columns when the split is compressed into a single
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// space, like:
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// lala lala
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return RemainingTokenColumns + 1 - Split.second;
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}
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unsigned BreakableSingleLineToken::getLineCount() const { return 1; }
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unsigned BreakableSingleLineToken::getLineLengthAfterSplit(
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unsigned LineIndex, unsigned TailOffset,
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StringRef::size_type Length) const {
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return StartColumn + Prefix.size() + Postfix.size() +
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encoding::columnWidthWithTabs(Line.substr(TailOffset, Length),
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StartColumn + Prefix.size(),
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Style.TabWidth, Encoding);
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}
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BreakableSingleLineToken::BreakableSingleLineToken(
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const FormatToken &Tok, unsigned StartColumn, StringRef Prefix,
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StringRef Postfix, bool InPPDirective, encoding::Encoding Encoding,
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const FormatStyle &Style)
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: BreakableToken(Tok, InPPDirective, Encoding, Style),
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StartColumn(StartColumn), Prefix(Prefix), Postfix(Postfix) {
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assert(Tok.TokenText.startswith(Prefix) && Tok.TokenText.endswith(Postfix));
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Line = Tok.TokenText.substr(
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Prefix.size(), Tok.TokenText.size() - Prefix.size() - Postfix.size());
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}
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BreakableStringLiteral::BreakableStringLiteral(
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const FormatToken &Tok, unsigned StartColumn, StringRef Prefix,
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StringRef Postfix, bool InPPDirective, encoding::Encoding Encoding,
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const FormatStyle &Style)
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: BreakableSingleLineToken(Tok, StartColumn, Prefix, Postfix, InPPDirective,
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Encoding, Style) {}
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BreakableToken::Split
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BreakableStringLiteral::getSplit(unsigned LineIndex, unsigned TailOffset,
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unsigned ColumnLimit,
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llvm::Regex &CommentPragmasRegex) const {
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return getStringSplit(Line.substr(TailOffset),
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StartColumn + Prefix.size() + Postfix.size(),
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ColumnLimit, Style.TabWidth, Encoding);
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}
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void BreakableStringLiteral::insertBreak(unsigned LineIndex,
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unsigned TailOffset, Split Split,
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WhitespaceManager &Whitespaces) {
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Whitespaces.replaceWhitespaceInToken(
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Tok, Prefix.size() + TailOffset + Split.first, Split.second, Postfix,
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Prefix, InPPDirective, 1, StartColumn);
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}
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BreakableComment::BreakableComment(const FormatToken &Token,
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unsigned StartColumn, bool InPPDirective,
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encoding::Encoding Encoding,
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const FormatStyle &Style)
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: BreakableToken(Token, InPPDirective, Encoding, Style),
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StartColumn(StartColumn) {}
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unsigned BreakableComment::getLineCount() const { return Lines.size(); }
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BreakableToken::Split
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BreakableComment::getSplit(unsigned LineIndex, unsigned TailOffset,
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unsigned ColumnLimit,
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llvm::Regex &CommentPragmasRegex) const {
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// Don't break lines matching the comment pragmas regex.
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if (CommentPragmasRegex.match(Content[LineIndex]))
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return Split(StringRef::npos, 0);
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return getCommentSplit(Content[LineIndex].substr(TailOffset),
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getContentStartColumn(LineIndex, TailOffset),
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ColumnLimit, Style.TabWidth, Encoding);
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}
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void BreakableComment::compressWhitespace(unsigned LineIndex,
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unsigned TailOffset, Split Split,
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WhitespaceManager &Whitespaces) {
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StringRef Text = Content[LineIndex].substr(TailOffset);
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// Text is relative to the content line, but Whitespaces operates relative to
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// the start of the corresponding token, so compute the start of the Split
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// that needs to be compressed into a single space relative to the start of
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// its token.
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unsigned BreakOffsetInToken =
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Text.data() - tokenAt(LineIndex).TokenText.data() + Split.first;
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unsigned CharsToRemove = Split.second;
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Whitespaces.replaceWhitespaceInToken(
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tokenAt(LineIndex), BreakOffsetInToken, CharsToRemove, "", "",
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/*InPPDirective=*/false, /*Newlines=*/0, /*Spaces=*/1);
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}
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BreakableToken::Split
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BreakableComment::getReflowSplit(StringRef Text, StringRef ReflowPrefix,
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unsigned PreviousEndColumn,
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unsigned ColumnLimit) const {
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unsigned ReflowStartColumn = PreviousEndColumn + ReflowPrefix.size();
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StringRef TrimmedText = Text.rtrim(Blanks);
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// This is the width of the resulting line in case the full line of Text gets
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// reflown up starting at ReflowStartColumn.
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unsigned FullWidth = ReflowStartColumn + encoding::columnWidthWithTabs(
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TrimmedText, ReflowStartColumn,
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Style.TabWidth, Encoding);
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// If the full line fits up, we return a reflow split after it,
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// otherwise we compute the largest piece of text that fits after
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// ReflowStartColumn.
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Split ReflowSplit =
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FullWidth <= ColumnLimit
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? Split(TrimmedText.size(), Text.size() - TrimmedText.size())
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: getCommentSplit(Text, ReflowStartColumn, ColumnLimit,
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Style.TabWidth, Encoding);
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// We need to be extra careful here, because while it's OK to keep a long line
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// if it can't be broken into smaller pieces (like when the first word of a
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// long line is longer than the column limit), it's not OK to reflow that long
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// word up. So we recompute the size of the previous line after reflowing and
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// only return the reflow split if that's under the line limit.
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if (ReflowSplit.first != StringRef::npos &&
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// Check if the width of the newly reflown line is under the limit.
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PreviousEndColumn + ReflowPrefix.size() +
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encoding::columnWidthWithTabs(Text.substr(0, ReflowSplit.first),
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PreviousEndColumn +
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ReflowPrefix.size(),
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Style.TabWidth, Encoding) <=
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ColumnLimit) {
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return ReflowSplit;
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}
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return Split(StringRef::npos, 0);
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}
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const FormatToken &BreakableComment::tokenAt(unsigned LineIndex) const {
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return Tokens[LineIndex] ? *Tokens[LineIndex] : Tok;
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}
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static bool mayReflowContent(StringRef Content) {
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Content = Content.trim(Blanks);
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// Lines starting with '@' commonly have special meaning.
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// Lines starting with '-', '-#', '+' or '*' are bulleted/numbered lists.
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static const SmallVector<StringRef, 8> kSpecialMeaningPrefixes = {
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"@", "TODO", "FIXME", "XXX", "-# ", "- ", "+ ", "* "};
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bool hasSpecialMeaningPrefix = false;
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for (StringRef Prefix : kSpecialMeaningPrefixes) {
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if (Content.startswith(Prefix)) {
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hasSpecialMeaningPrefix = true;
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break;
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}
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}
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// Numbered lists may also start with a number followed by '.'
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// To avoid issues if a line starts with a number which is actually the end
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// of a previous line, we only consider numbers with up to 2 digits.
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static llvm::Regex kNumberedListRegexp = llvm::Regex("^[1-9][0-9]?\\. ");
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hasSpecialMeaningPrefix =
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hasSpecialMeaningPrefix || kNumberedListRegexp.match(Content);
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// Simple heuristic for what to reflow: content should contain at least two
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// characters and either the first or second character must be
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// non-punctuation.
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return Content.size() >= 2 && !hasSpecialMeaningPrefix &&
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!Content.endswith("\\") &&
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// Note that this is UTF-8 safe, since if isPunctuation(Content[0]) is
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// true, then the first code point must be 1 byte long.
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(!isPunctuation(Content[0]) || !isPunctuation(Content[1]));
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}
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BreakableBlockComment::BreakableBlockComment(
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const FormatToken &Token, unsigned StartColumn,
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unsigned OriginalStartColumn, bool FirstInLine, bool InPPDirective,
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encoding::Encoding Encoding, const FormatStyle &Style)
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: BreakableComment(Token, StartColumn, InPPDirective, Encoding, Style),
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DelimitersOnNewline(false) {
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assert(Tok.is(TT_BlockComment) &&
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"block comment section must start with a block comment");
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StringRef TokenText(Tok.TokenText);
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assert(TokenText.startswith("/*") && TokenText.endswith("*/"));
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TokenText.substr(2, TokenText.size() - 4).split(Lines, "\n");
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int IndentDelta = StartColumn - OriginalStartColumn;
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Content.resize(Lines.size());
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Content[0] = Lines[0];
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ContentColumn.resize(Lines.size());
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// Account for the initial '/*'.
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ContentColumn[0] = StartColumn + 2;
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Tokens.resize(Lines.size());
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for (size_t i = 1; i < Lines.size(); ++i)
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adjustWhitespace(i, IndentDelta);
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// Align decorations with the column of the star on the first line,
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// that is one column after the start "/*".
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DecorationColumn = StartColumn + 1;
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// Account for comment decoration patterns like this:
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//
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// /*
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// ** blah blah blah
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// */
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if (Lines.size() >= 2 && Content[1].startswith("**") &&
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static_cast<unsigned>(ContentColumn[1]) == StartColumn) {
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DecorationColumn = StartColumn;
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}
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Decoration = "* ";
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if (Lines.size() == 1 && !FirstInLine) {
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// Comments for which FirstInLine is false can start on arbitrary column,
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// and available horizontal space can be too small to align consecutive
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// lines with the first one.
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// FIXME: We could, probably, align them to current indentation level, but
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// now we just wrap them without stars.
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Decoration = "";
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}
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for (size_t i = 1, e = Lines.size(); i < e && !Decoration.empty(); ++i) {
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// If the last line is empty, the closing "*/" will have a star.
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if (i + 1 == e && Content[i].empty())
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break;
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if (!Content[i].empty() && i + 1 != e && Decoration.startswith(Content[i]))
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continue;
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while (!Content[i].startswith(Decoration))
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Decoration = Decoration.substr(0, Decoration.size() - 1);
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}
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LastLineNeedsDecoration = true;
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IndentAtLineBreak = ContentColumn[0] + 1;
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for (size_t i = 1, e = Lines.size(); i < e; ++i) {
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if (Content[i].empty()) {
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if (i + 1 == e) {
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// Empty last line means that we already have a star as a part of the
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// trailing */. We also need to preserve whitespace, so that */ is
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// correctly indented.
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LastLineNeedsDecoration = false;
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// Align the star in the last '*/' with the stars on the previous lines.
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if (e >= 2 && !Decoration.empty()) {
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ContentColumn[i] = DecorationColumn;
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}
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} else if (Decoration.empty()) {
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// For all other lines, set the start column to 0 if they're empty, so
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// we do not insert trailing whitespace anywhere.
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ContentColumn[i] = 0;
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}
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continue;
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}
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// The first line already excludes the star.
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// The last line excludes the star if LastLineNeedsDecoration is false.
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// For all other lines, adjust the line to exclude the star and
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// (optionally) the first whitespace.
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unsigned DecorationSize = Decoration.startswith(Content[i])
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? Content[i].size()
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: Decoration.size();
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if (DecorationSize) {
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ContentColumn[i] = DecorationColumn + DecorationSize;
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}
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Content[i] = Content[i].substr(DecorationSize);
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if (!Decoration.startswith(Content[i]))
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IndentAtLineBreak =
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std::min<int>(IndentAtLineBreak, std::max(0, ContentColumn[i]));
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}
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IndentAtLineBreak = std::max<unsigned>(IndentAtLineBreak, Decoration.size());
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// Detect a multiline jsdoc comment and set DelimitersOnNewline in that case.
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if (Style.Language == FormatStyle::LK_JavaScript ||
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Style.Language == FormatStyle::LK_Java) {
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if ((Lines[0] == "*" || Lines[0].startswith("* ")) && Lines.size() > 1) {
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// This is a multiline jsdoc comment.
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DelimitersOnNewline = true;
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} else if (Lines[0].startswith("* ") && Lines.size() == 1) {
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// Detect a long single-line comment, like:
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// /** long long long */
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// Below, '2' is the width of '*/'.
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unsigned EndColumn =
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ContentColumn[0] +
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encoding::columnWidthWithTabs(Lines[0], ContentColumn[0],
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Style.TabWidth, Encoding) +
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2;
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DelimitersOnNewline = EndColumn > Style.ColumnLimit;
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}
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}
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DEBUG({
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llvm::dbgs() << "IndentAtLineBreak " << IndentAtLineBreak << "\n";
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llvm::dbgs() << "DelimitersOnNewline " << DelimitersOnNewline << "\n";
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for (size_t i = 0; i < Lines.size(); ++i) {
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llvm::dbgs() << i << " |" << Content[i] << "| "
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<< "CC=" << ContentColumn[i] << "| "
|
|
<< "IN=" << (Content[i].data() - Lines[i].data()) << "\n";
|
|
}
|
|
});
|
|
}
|
|
|
|
void BreakableBlockComment::adjustWhitespace(unsigned LineIndex,
|
|
int IndentDelta) {
|
|
// When in a preprocessor directive, the trailing backslash in a block comment
|
|
// is not needed, but can serve a purpose of uniformity with necessary escaped
|
|
// newlines outside the comment. In this case we remove it here before
|
|
// trimming the trailing whitespace. The backslash will be re-added later when
|
|
// inserting a line break.
|
|
size_t EndOfPreviousLine = Lines[LineIndex - 1].size();
|
|
if (InPPDirective && Lines[LineIndex - 1].endswith("\\"))
|
|
--EndOfPreviousLine;
|
|
|
|
// Calculate the end of the non-whitespace text in the previous line.
|
|
EndOfPreviousLine =
|
|
Lines[LineIndex - 1].find_last_not_of(Blanks, EndOfPreviousLine);
|
|
if (EndOfPreviousLine == StringRef::npos)
|
|
EndOfPreviousLine = 0;
|
|
else
|
|
++EndOfPreviousLine;
|
|
// Calculate the start of the non-whitespace text in the current line.
|
|
size_t StartOfLine = Lines[LineIndex].find_first_not_of(Blanks);
|
|
if (StartOfLine == StringRef::npos)
|
|
StartOfLine = Lines[LineIndex].rtrim("\r\n").size();
|
|
|
|
StringRef Whitespace = Lines[LineIndex].substr(0, StartOfLine);
|
|
// Adjust Lines to only contain relevant text.
|
|
size_t PreviousContentOffset =
|
|
Content[LineIndex - 1].data() - Lines[LineIndex - 1].data();
|
|
Content[LineIndex - 1] = Lines[LineIndex - 1].substr(
|
|
PreviousContentOffset, EndOfPreviousLine - PreviousContentOffset);
|
|
Content[LineIndex] = Lines[LineIndex].substr(StartOfLine);
|
|
|
|
// Adjust the start column uniformly across all lines.
|
|
ContentColumn[LineIndex] =
|
|
encoding::columnWidthWithTabs(Whitespace, 0, Style.TabWidth, Encoding) +
|
|
IndentDelta;
|
|
}
|
|
|
|
unsigned BreakableBlockComment::getLineLengthAfterSplit(
|
|
unsigned LineIndex, unsigned TailOffset,
|
|
StringRef::size_type Length) const {
|
|
unsigned ContentStartColumn = getContentStartColumn(LineIndex, TailOffset);
|
|
unsigned LineLength =
|
|
ContentStartColumn + encoding::columnWidthWithTabs(
|
|
Content[LineIndex].substr(TailOffset, Length),
|
|
ContentStartColumn, Style.TabWidth, Encoding);
|
|
// The last line gets a "*/" postfix.
|
|
if (LineIndex + 1 == Lines.size()) {
|
|
LineLength += 2;
|
|
// We never need a decoration when breaking just the trailing "*/" postfix.
|
|
// Note that checking that Length == 0 is not enough, since Length could
|
|
// also be StringRef::npos.
|
|
if (Content[LineIndex].substr(TailOffset, Length).empty()) {
|
|
LineLength -= Decoration.size();
|
|
}
|
|
}
|
|
return LineLength;
|
|
}
|
|
|
|
void BreakableBlockComment::insertBreak(unsigned LineIndex, unsigned TailOffset,
|
|
Split Split,
|
|
WhitespaceManager &Whitespaces) {
|
|
StringRef Text = Content[LineIndex].substr(TailOffset);
|
|
StringRef Prefix = Decoration;
|
|
// We need this to account for the case when we have a decoration "* " for all
|
|
// the lines except for the last one, where the star in "*/" acts as a
|
|
// decoration.
|
|
unsigned LocalIndentAtLineBreak = IndentAtLineBreak;
|
|
if (LineIndex + 1 == Lines.size() &&
|
|
Text.size() == Split.first + Split.second) {
|
|
// For the last line we need to break before "*/", but not to add "* ".
|
|
Prefix = "";
|
|
if (LocalIndentAtLineBreak >= 2)
|
|
LocalIndentAtLineBreak -= 2;
|
|
}
|
|
// The split offset is from the beginning of the line. Convert it to an offset
|
|
// from the beginning of the token text.
|
|
unsigned BreakOffsetInToken =
|
|
Text.data() - tokenAt(LineIndex).TokenText.data() + Split.first;
|
|
unsigned CharsToRemove = Split.second;
|
|
assert(LocalIndentAtLineBreak >= Prefix.size());
|
|
Whitespaces.replaceWhitespaceInToken(
|
|
tokenAt(LineIndex), BreakOffsetInToken, CharsToRemove, "", Prefix,
|
|
InPPDirective, /*Newlines=*/1,
|
|
/*Spaces=*/LocalIndentAtLineBreak - Prefix.size());
|
|
}
|
|
|
|
BreakableToken::Split BreakableBlockComment::getSplitBefore(
|
|
unsigned LineIndex, unsigned PreviousEndColumn, unsigned ColumnLimit,
|
|
llvm::Regex &CommentPragmasRegex) const {
|
|
if (!mayReflow(LineIndex, CommentPragmasRegex))
|
|
return Split(StringRef::npos, 0);
|
|
StringRef TrimmedContent = Content[LineIndex].ltrim(Blanks);
|
|
Split Result = getReflowSplit(TrimmedContent, ReflowPrefix, PreviousEndColumn,
|
|
ColumnLimit);
|
|
// Result is relative to TrimmedContent. Adapt it relative to
|
|
// Content[LineIndex].
|
|
if (Result.first != StringRef::npos)
|
|
Result.first += Content[LineIndex].size() - TrimmedContent.size();
|
|
return Result;
|
|
}
|
|
|
|
unsigned
|
|
BreakableBlockComment::getReflownColumn(StringRef Content, unsigned LineIndex,
|
|
unsigned PreviousEndColumn) const {
|
|
unsigned StartColumn = PreviousEndColumn + ReflowPrefix.size();
|
|
// If this is the last line, it will carry around its '*/' postfix.
|
|
unsigned PostfixLength = (LineIndex + 1 == Lines.size() ? 2 : 0);
|
|
// The line is composed of previous text, reflow prefix, reflown text and
|
|
// postfix.
|
|
unsigned ReflownColumn = StartColumn +
|
|
encoding::columnWidthWithTabs(
|
|
Content, StartColumn, Style.TabWidth, Encoding) +
|
|
PostfixLength;
|
|
return ReflownColumn;
|
|
}
|
|
|
|
unsigned BreakableBlockComment::getLineLengthAfterSplitBefore(
|
|
unsigned LineIndex, unsigned TailOffset, unsigned PreviousEndColumn,
|
|
unsigned ColumnLimit, Split SplitBefore) const {
|
|
if (SplitBefore.first == StringRef::npos ||
|
|
// Block comment line contents contain the trailing whitespace after the
|
|
// decoration, so the need of left trim. Note that this behavior is
|
|
// consistent with the breaking of block comments where the indentation of
|
|
// a broken line is uniform across all the lines of the block comment.
|
|
SplitBefore.first + SplitBefore.second <
|
|
Content[LineIndex].ltrim().size()) {
|
|
// A piece of line, not the whole, gets reflown.
|
|
return getLineLengthAfterSplit(LineIndex, TailOffset, StringRef::npos);
|
|
} else {
|
|
// The whole line gets reflown, need to check if we need to insert a break
|
|
// for the postfix or not.
|
|
StringRef TrimmedContent = Content[LineIndex].ltrim(Blanks);
|
|
unsigned ReflownColumn =
|
|
getReflownColumn(TrimmedContent, LineIndex, PreviousEndColumn);
|
|
if (ReflownColumn <= ColumnLimit) {
|
|
return ReflownColumn;
|
|
}
|
|
return getLineLengthAfterSplit(LineIndex, TailOffset, StringRef::npos);
|
|
}
|
|
}
|
|
|
|
bool BreakableBlockComment::introducesBreakBeforeToken() const {
|
|
// A break is introduced when we want delimiters on newline.
|
|
return DelimitersOnNewline &&
|
|
Lines[0].substr(1).find_first_not_of(Blanks) != StringRef::npos;
|
|
}
|
|
|
|
void BreakableBlockComment::replaceWhitespaceBefore(
|
|
unsigned LineIndex, unsigned PreviousEndColumn, unsigned ColumnLimit,
|
|
Split SplitBefore, WhitespaceManager &Whitespaces) {
|
|
if (LineIndex == 0) {
|
|
if (DelimitersOnNewline) {
|
|
// Since we're breaking af index 1 below, the break position and the
|
|
// break length are the same.
|
|
size_t BreakLength = Lines[0].substr(1).find_first_not_of(Blanks);
|
|
if (BreakLength != StringRef::npos) {
|
|
insertBreak(LineIndex, 0, Split(1, BreakLength), Whitespaces);
|
|
DelimitersOnNewline = true;
|
|
}
|
|
}
|
|
return;
|
|
}
|
|
StringRef TrimmedContent = Content[LineIndex].ltrim(Blanks);
|
|
if (SplitBefore.first != StringRef::npos) {
|
|
// Here we need to reflow.
|
|
assert(Tokens[LineIndex - 1] == Tokens[LineIndex] &&
|
|
"Reflowing whitespace within a token");
|
|
// This is the offset of the end of the last line relative to the start of
|
|
// the token text in the token.
|
|
unsigned WhitespaceOffsetInToken = Content[LineIndex - 1].data() +
|
|
Content[LineIndex - 1].size() -
|
|
tokenAt(LineIndex).TokenText.data();
|
|
unsigned WhitespaceLength = TrimmedContent.data() -
|
|
tokenAt(LineIndex).TokenText.data() -
|
|
WhitespaceOffsetInToken;
|
|
Whitespaces.replaceWhitespaceInToken(
|
|
tokenAt(LineIndex), WhitespaceOffsetInToken,
|
|
/*ReplaceChars=*/WhitespaceLength, /*PreviousPostfix=*/"",
|
|
/*CurrentPrefix=*/ReflowPrefix, InPPDirective, /*Newlines=*/0,
|
|
/*Spaces=*/0);
|
|
// Check if we need to also insert a break at the whitespace range.
|
|
// Note that we don't need a penalty for this break, since it doesn't change
|
|
// the total number of lines.
|
|
unsigned ReflownColumn =
|
|
getReflownColumn(TrimmedContent, LineIndex, PreviousEndColumn);
|
|
if (ReflownColumn > ColumnLimit)
|
|
insertBreak(LineIndex, 0, SplitBefore, Whitespaces);
|
|
return;
|
|
}
|
|
|
|
// Here no reflow with the previous line will happen.
|
|
// Fix the decoration of the line at LineIndex.
|
|
StringRef Prefix = Decoration;
|
|
if (Content[LineIndex].empty()) {
|
|
if (LineIndex + 1 == Lines.size()) {
|
|
if (!LastLineNeedsDecoration) {
|
|
// If the last line was empty, we don't need a prefix, as the */ will
|
|
// line up with the decoration (if it exists).
|
|
Prefix = "";
|
|
}
|
|
} else if (!Decoration.empty()) {
|
|
// For other empty lines, if we do have a decoration, adapt it to not
|
|
// contain a trailing whitespace.
|
|
Prefix = Prefix.substr(0, 1);
|
|
}
|
|
} else {
|
|
if (ContentColumn[LineIndex] == 1) {
|
|
// This line starts immediately after the decorating *.
|
|
Prefix = Prefix.substr(0, 1);
|
|
}
|
|
}
|
|
// This is the offset of the end of the last line relative to the start of the
|
|
// token text in the token.
|
|
unsigned WhitespaceOffsetInToken = Content[LineIndex - 1].data() +
|
|
Content[LineIndex - 1].size() -
|
|
tokenAt(LineIndex).TokenText.data();
|
|
unsigned WhitespaceLength = Content[LineIndex].data() -
|
|
tokenAt(LineIndex).TokenText.data() -
|
|
WhitespaceOffsetInToken;
|
|
Whitespaces.replaceWhitespaceInToken(
|
|
tokenAt(LineIndex), WhitespaceOffsetInToken, WhitespaceLength, "", Prefix,
|
|
InPPDirective, /*Newlines=*/1, ContentColumn[LineIndex] - Prefix.size());
|
|
}
|
|
|
|
BreakableToken::Split
|
|
BreakableBlockComment::getSplitAfterLastLine(unsigned TailOffset,
|
|
unsigned ColumnLimit) const {
|
|
if (DelimitersOnNewline) {
|
|
// Replace the trailing whitespace of the last line with a newline.
|
|
// In case the last line is empty, the ending '*/' is already on its own
|
|
// line.
|
|
StringRef Line = Content.back().substr(TailOffset);
|
|
StringRef TrimmedLine = Line.rtrim(Blanks);
|
|
if (!TrimmedLine.empty())
|
|
return Split(TrimmedLine.size(), Line.size() - TrimmedLine.size());
|
|
}
|
|
return Split(StringRef::npos, 0);
|
|
}
|
|
|
|
bool BreakableBlockComment::mayReflow(unsigned LineIndex,
|
|
llvm::Regex &CommentPragmasRegex) const {
|
|
// Content[LineIndex] may exclude the indent after the '*' decoration. In that
|
|
// case, we compute the start of the comment pragma manually.
|
|
StringRef IndentContent = Content[LineIndex];
|
|
if (Lines[LineIndex].ltrim(Blanks).startswith("*")) {
|
|
IndentContent = Lines[LineIndex].ltrim(Blanks).substr(1);
|
|
}
|
|
return LineIndex > 0 && !CommentPragmasRegex.match(IndentContent) &&
|
|
mayReflowContent(Content[LineIndex]) && !Tok.Finalized &&
|
|
!switchesFormatting(tokenAt(LineIndex));
|
|
}
|
|
|
|
unsigned
|
|
BreakableBlockComment::getContentStartColumn(unsigned LineIndex,
|
|
unsigned TailOffset) const {
|
|
// If we break, we always break at the predefined indent.
|
|
if (TailOffset != 0)
|
|
return IndentAtLineBreak;
|
|
return std::max(0, ContentColumn[LineIndex]);
|
|
}
|
|
|
|
BreakableLineCommentSection::BreakableLineCommentSection(
|
|
const FormatToken &Token, unsigned StartColumn,
|
|
unsigned OriginalStartColumn, bool FirstInLine, bool InPPDirective,
|
|
encoding::Encoding Encoding, const FormatStyle &Style)
|
|
: BreakableComment(Token, StartColumn, InPPDirective, Encoding, Style) {
|
|
assert(Tok.is(TT_LineComment) &&
|
|
"line comment section must start with a line comment");
|
|
FormatToken *LineTok = nullptr;
|
|
for (const FormatToken *CurrentTok = &Tok;
|
|
CurrentTok && CurrentTok->is(TT_LineComment);
|
|
CurrentTok = CurrentTok->Next) {
|
|
LastLineTok = LineTok;
|
|
StringRef TokenText(CurrentTok->TokenText);
|
|
assert((TokenText.startswith("//") || TokenText.startswith("#")) &&
|
|
"unsupported line comment prefix, '//' and '#' are supported");
|
|
size_t FirstLineIndex = Lines.size();
|
|
TokenText.split(Lines, "\n");
|
|
Content.resize(Lines.size());
|
|
ContentColumn.resize(Lines.size());
|
|
OriginalContentColumn.resize(Lines.size());
|
|
Tokens.resize(Lines.size());
|
|
Prefix.resize(Lines.size());
|
|
OriginalPrefix.resize(Lines.size());
|
|
for (size_t i = FirstLineIndex, e = Lines.size(); i < e; ++i) {
|
|
Lines[i] = Lines[i].ltrim(Blanks);
|
|
// We need to trim the blanks in case this is not the first line in a
|
|
// multiline comment. Then the indent is included in Lines[i].
|
|
StringRef IndentPrefix =
|
|
getLineCommentIndentPrefix(Lines[i].ltrim(Blanks), Style);
|
|
assert((TokenText.startswith("//") || TokenText.startswith("#")) &&
|
|
"unsupported line comment prefix, '//' and '#' are supported");
|
|
OriginalPrefix[i] = Prefix[i] = IndentPrefix;
|
|
if (Lines[i].size() > Prefix[i].size() &&
|
|
isAlphanumeric(Lines[i][Prefix[i].size()])) {
|
|
if (Prefix[i] == "//")
|
|
Prefix[i] = "// ";
|
|
else if (Prefix[i] == "///")
|
|
Prefix[i] = "/// ";
|
|
else if (Prefix[i] == "//!")
|
|
Prefix[i] = "//! ";
|
|
else if (Prefix[i] == "///<")
|
|
Prefix[i] = "///< ";
|
|
else if (Prefix[i] == "//!<")
|
|
Prefix[i] = "//!< ";
|
|
else if (Prefix[i] == "#" &&
|
|
Style.Language == FormatStyle::LK_TextProto)
|
|
Prefix[i] = "# ";
|
|
}
|
|
|
|
Tokens[i] = LineTok;
|
|
Content[i] = Lines[i].substr(IndentPrefix.size());
|
|
OriginalContentColumn[i] =
|
|
StartColumn + encoding::columnWidthWithTabs(OriginalPrefix[i],
|
|
StartColumn,
|
|
Style.TabWidth, Encoding);
|
|
ContentColumn[i] =
|
|
StartColumn + encoding::columnWidthWithTabs(Prefix[i], StartColumn,
|
|
Style.TabWidth, Encoding);
|
|
|
|
// Calculate the end of the non-whitespace text in this line.
|
|
size_t EndOfLine = Content[i].find_last_not_of(Blanks);
|
|
if (EndOfLine == StringRef::npos)
|
|
EndOfLine = Content[i].size();
|
|
else
|
|
++EndOfLine;
|
|
Content[i] = Content[i].substr(0, EndOfLine);
|
|
}
|
|
LineTok = CurrentTok->Next;
|
|
if (CurrentTok->Next && !CurrentTok->Next->ContinuesLineCommentSection) {
|
|
// A line comment section needs to broken by a line comment that is
|
|
// preceded by at least two newlines. Note that we put this break here
|
|
// instead of breaking at a previous stage during parsing, since that
|
|
// would split the contents of the enum into two unwrapped lines in this
|
|
// example, which is undesirable:
|
|
// enum A {
|
|
// a, // comment about a
|
|
//
|
|
// // comment about b
|
|
// b
|
|
// };
|
|
//
|
|
// FIXME: Consider putting separate line comment sections as children to
|
|
// the unwrapped line instead.
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
unsigned BreakableLineCommentSection::getLineLengthAfterSplit(
|
|
unsigned LineIndex, unsigned TailOffset,
|
|
StringRef::size_type Length) const {
|
|
unsigned ContentStartColumn =
|
|
(TailOffset == 0 ? ContentColumn[LineIndex]
|
|
: OriginalContentColumn[LineIndex]);
|
|
return ContentStartColumn + encoding::columnWidthWithTabs(
|
|
Content[LineIndex].substr(TailOffset, Length),
|
|
ContentStartColumn, Style.TabWidth, Encoding);
|
|
}
|
|
|
|
void BreakableLineCommentSection::insertBreak(unsigned LineIndex,
|
|
unsigned TailOffset, Split Split,
|
|
WhitespaceManager &Whitespaces) {
|
|
StringRef Text = Content[LineIndex].substr(TailOffset);
|
|
// Compute the offset of the split relative to the beginning of the token
|
|
// text.
|
|
unsigned BreakOffsetInToken =
|
|
Text.data() - tokenAt(LineIndex).TokenText.data() + Split.first;
|
|
unsigned CharsToRemove = Split.second;
|
|
// Compute the size of the new indent, including the size of the new prefix of
|
|
// the newly broken line.
|
|
unsigned IndentAtLineBreak = OriginalContentColumn[LineIndex] +
|
|
Prefix[LineIndex].size() -
|
|
OriginalPrefix[LineIndex].size();
|
|
assert(IndentAtLineBreak >= Prefix[LineIndex].size());
|
|
Whitespaces.replaceWhitespaceInToken(
|
|
tokenAt(LineIndex), BreakOffsetInToken, CharsToRemove, "",
|
|
Prefix[LineIndex], InPPDirective, /*Newlines=*/1,
|
|
/*Spaces=*/IndentAtLineBreak - Prefix[LineIndex].size());
|
|
}
|
|
|
|
BreakableComment::Split BreakableLineCommentSection::getSplitBefore(
|
|
unsigned LineIndex, unsigned PreviousEndColumn, unsigned ColumnLimit,
|
|
llvm::Regex &CommentPragmasRegex) const {
|
|
if (!mayReflow(LineIndex, CommentPragmasRegex))
|
|
return Split(StringRef::npos, 0);
|
|
return getReflowSplit(Content[LineIndex], ReflowPrefix, PreviousEndColumn,
|
|
ColumnLimit);
|
|
}
|
|
|
|
unsigned BreakableLineCommentSection::getLineLengthAfterSplitBefore(
|
|
unsigned LineIndex, unsigned TailOffset, unsigned PreviousEndColumn,
|
|
unsigned ColumnLimit, Split SplitBefore) const {
|
|
if (SplitBefore.first == StringRef::npos ||
|
|
SplitBefore.first + SplitBefore.second < Content[LineIndex].size()) {
|
|
// A piece of line, not the whole line, gets reflown.
|
|
return getLineLengthAfterSplit(LineIndex, TailOffset, StringRef::npos);
|
|
} else {
|
|
// The whole line gets reflown.
|
|
unsigned StartColumn = PreviousEndColumn + ReflowPrefix.size();
|
|
return StartColumn +
|
|
encoding::columnWidthWithTabs(Content[LineIndex], StartColumn,
|
|
Style.TabWidth, Encoding);
|
|
}
|
|
}
|
|
|
|
void BreakableLineCommentSection::replaceWhitespaceBefore(
|
|
unsigned LineIndex, unsigned PreviousEndColumn, unsigned ColumnLimit,
|
|
Split SplitBefore, WhitespaceManager &Whitespaces) {
|
|
// If this is the first line of a token, we need to inform Whitespace Manager
|
|
// about it: either adapt the whitespace range preceding it, or mark it as an
|
|
// untouchable token.
|
|
// This happens for instance here:
|
|
// // line 1 \
|
|
// // line 2
|
|
if (LineIndex > 0 && Tokens[LineIndex] != Tokens[LineIndex - 1]) {
|
|
if (SplitBefore.first != StringRef::npos) {
|
|
// Reflow happens between tokens. Replace the whitespace between the
|
|
// tokens by the empty string.
|
|
Whitespaces.replaceWhitespace(
|
|
*Tokens[LineIndex], /*Newlines=*/0, /*Spaces=*/0,
|
|
/*StartOfTokenColumn=*/StartColumn, /*InPPDirective=*/false);
|
|
// Replace the indent and prefix of the token with the reflow prefix.
|
|
unsigned WhitespaceLength =
|
|
Content[LineIndex].data() - tokenAt(LineIndex).TokenText.data();
|
|
Whitespaces.replaceWhitespaceInToken(*Tokens[LineIndex],
|
|
/*Offset=*/0,
|
|
/*ReplaceChars=*/WhitespaceLength,
|
|
/*PreviousPostfix=*/"",
|
|
/*CurrentPrefix=*/ReflowPrefix,
|
|
/*InPPDirective=*/false,
|
|
/*Newlines=*/0,
|
|
/*Spaces=*/0);
|
|
} else {
|
|
// This is the first line for the current token, but no reflow with the
|
|
// previous token is necessary. However, we still may need to adjust the
|
|
// start column. Note that ContentColumn[LineIndex] is the expected
|
|
// content column after a possible update to the prefix, hence the prefix
|
|
// length change is included.
|
|
unsigned LineColumn =
|
|
ContentColumn[LineIndex] -
|
|
(Content[LineIndex].data() - Lines[LineIndex].data()) +
|
|
(OriginalPrefix[LineIndex].size() - Prefix[LineIndex].size());
|
|
|
|
// We always want to create a replacement instead of adding an untouchable
|
|
// token, even if LineColumn is the same as the original column of the
|
|
// token. This is because WhitespaceManager doesn't align trailing
|
|
// comments if they are untouchable.
|
|
Whitespaces.replaceWhitespace(*Tokens[LineIndex],
|
|
/*Newlines=*/1,
|
|
/*Spaces=*/LineColumn,
|
|
/*StartOfTokenColumn=*/LineColumn,
|
|
/*InPPDirective=*/false);
|
|
}
|
|
}
|
|
if (OriginalPrefix[LineIndex] != Prefix[LineIndex]) {
|
|
// Adjust the prefix if necessary.
|
|
|
|
// Take care of the space possibly introduced after a decoration.
|
|
assert(Prefix[LineIndex] == (OriginalPrefix[LineIndex] + " ").str() &&
|
|
"Expecting a line comment prefix to differ from original by at most "
|
|
"a space");
|
|
Whitespaces.replaceWhitespaceInToken(
|
|
tokenAt(LineIndex), OriginalPrefix[LineIndex].size(), 0, "", "",
|
|
/*InPPDirective=*/false, /*Newlines=*/0, /*Spaces=*/1);
|
|
}
|
|
// Add a break after a reflow split has been introduced, if necessary.
|
|
// Note that this break doesn't need to be penalized, since it doesn't change
|
|
// the number of lines.
|
|
if (SplitBefore.first != StringRef::npos &&
|
|
SplitBefore.first + SplitBefore.second < Content[LineIndex].size()) {
|
|
insertBreak(LineIndex, 0, SplitBefore, Whitespaces);
|
|
}
|
|
}
|
|
|
|
void BreakableLineCommentSection::updateNextToken(LineState &State) const {
|
|
if (LastLineTok) {
|
|
State.NextToken = LastLineTok->Next;
|
|
}
|
|
}
|
|
|
|
bool BreakableLineCommentSection::mayReflow(
|
|
unsigned LineIndex, llvm::Regex &CommentPragmasRegex) const {
|
|
// Line comments have the indent as part of the prefix, so we need to
|
|
// recompute the start of the line.
|
|
StringRef IndentContent = Content[LineIndex];
|
|
if (Lines[LineIndex].startswith("//")) {
|
|
IndentContent = Lines[LineIndex].substr(2);
|
|
}
|
|
return LineIndex > 0 && !CommentPragmasRegex.match(IndentContent) &&
|
|
mayReflowContent(Content[LineIndex]) && !Tok.Finalized &&
|
|
!switchesFormatting(tokenAt(LineIndex)) &&
|
|
OriginalPrefix[LineIndex] == OriginalPrefix[LineIndex - 1];
|
|
}
|
|
|
|
unsigned
|
|
BreakableLineCommentSection::getContentStartColumn(unsigned LineIndex,
|
|
unsigned TailOffset) const {
|
|
if (TailOffset != 0) {
|
|
return OriginalContentColumn[LineIndex];
|
|
}
|
|
return ContentColumn[LineIndex];
|
|
}
|
|
|
|
} // namespace format
|
|
} // namespace clang
|