446 lines
18 KiB
C++
446 lines
18 KiB
C++
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//===--- 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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#define DEBUG_TYPE "format-token-breaker"
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#include "BreakableToken.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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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 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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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 getStringSplit(StringRef Text,
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unsigned UsedColumns,
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unsigned ColumnLimit,
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unsigned TabWidth,
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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 = std::min<unsigned>(
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ColumnLimit - UsedColumns,
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encoding::columnWidthWithTabs(Text, UsedColumns, TabWidth, Encoding) - 1);
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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)
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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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unsigned BreakableSingleLineToken::getLineCount() const { return 1; }
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unsigned BreakableSingleLineToken::getLineLengthAfterSplit(
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unsigned LineIndex, unsigned Offset, StringRef::size_type Length) const {
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return StartColumn + Prefix.size() + Postfix.size() +
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encoding::columnWidthWithTabs(Line.substr(Offset, 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 IndentLevel, unsigned StartColumn,
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StringRef Prefix, StringRef Postfix, bool InPPDirective,
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encoding::Encoding Encoding, const FormatStyle &Style)
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: BreakableToken(Tok, IndentLevel, 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 IndentLevel, unsigned StartColumn,
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StringRef Prefix, StringRef Postfix, bool InPPDirective,
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encoding::Encoding Encoding, const FormatStyle &Style)
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: BreakableSingleLineToken(Tok, IndentLevel, StartColumn, Prefix, Postfix,
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InPPDirective, Encoding, Style) {}
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BreakableToken::Split
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BreakableStringLiteral::getSplit(unsigned LineIndex, unsigned TailOffset,
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unsigned ColumnLimit) 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, IndentLevel, StartColumn);
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}
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static StringRef getLineCommentPrefix(StringRef Comment) {
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static const char *const KnownPrefixes[] = { "/// ", "///", "// ", "//" };
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for (size_t i = 0, e = llvm::array_lengthof(KnownPrefixes); i != e; ++i)
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if (Comment.startswith(KnownPrefixes[i]))
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return KnownPrefixes[i];
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return "";
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}
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BreakableLineComment::BreakableLineComment(
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const FormatToken &Token, unsigned IndentLevel, unsigned StartColumn,
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bool InPPDirective, encoding::Encoding Encoding, const FormatStyle &Style)
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: BreakableSingleLineToken(Token, IndentLevel, StartColumn,
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getLineCommentPrefix(Token.TokenText), "",
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InPPDirective, Encoding, Style) {
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OriginalPrefix = Prefix;
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if (Token.TokenText.size() > Prefix.size() &&
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isAlphanumeric(Token.TokenText[Prefix.size()])) {
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if (Prefix == "//")
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Prefix = "// ";
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else if (Prefix == "///")
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Prefix = "/// ";
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}
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}
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BreakableToken::Split
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BreakableLineComment::getSplit(unsigned LineIndex, unsigned TailOffset,
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unsigned ColumnLimit) const {
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return getCommentSplit(Line.substr(TailOffset), StartColumn + Prefix.size(),
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ColumnLimit, Style.TabWidth, Encoding);
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}
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void BreakableLineComment::insertBreak(unsigned LineIndex, unsigned TailOffset,
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Split Split,
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WhitespaceManager &Whitespaces) {
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Whitespaces.replaceWhitespaceInToken(
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Tok, OriginalPrefix.size() + TailOffset + Split.first, Split.second,
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Postfix, Prefix, InPPDirective, /*Newlines=*/1, IndentLevel, StartColumn);
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}
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void BreakableLineComment::replaceWhitespace(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, OriginalPrefix.size() + TailOffset + Split.first, Split.second, "",
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"", /*InPPDirective=*/false, /*Newlines=*/0, /*IndentLevel=*/0,
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/*Spaces=*/1);
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}
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void
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BreakableLineComment::replaceWhitespaceBefore(unsigned LineIndex,
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WhitespaceManager &Whitespaces) {
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if (OriginalPrefix != Prefix) {
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Whitespaces.replaceWhitespaceInToken(Tok, OriginalPrefix.size(), 0, "", "",
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/*InPPDirective=*/false,
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/*Newlines=*/0, /*IndentLevel=*/0,
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/*Spaces=*/1);
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}
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}
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BreakableBlockComment::BreakableBlockComment(
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const FormatToken &Token, unsigned IndentLevel, 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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: BreakableToken(Token, IndentLevel, InPPDirective, Encoding, Style) {
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StringRef TokenText(Token.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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LeadingWhitespace.resize(Lines.size());
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StartOfLineColumn.resize(Lines.size());
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StartOfLineColumn[0] = StartColumn + 2;
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for (size_t i = 1; i < Lines.size(); ++i)
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adjustWhitespace(i, IndentDelta);
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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 && Lines[i].empty())
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break;
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while (!Lines[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 = StartOfLineColumn[0] + 1;
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for (size_t i = 1; i < Lines.size(); ++i) {
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if (Lines[i].empty()) {
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if (i + 1 == Lines.size()) {
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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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} 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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StartOfLineColumn[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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// For all other lines, adjust the line to exclude the star and
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// (optionally) the first whitespace.
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StartOfLineColumn[i] += Decoration.size();
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Lines[i] = Lines[i].substr(Decoration.size());
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LeadingWhitespace[i] += Decoration.size();
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IndentAtLineBreak = std::min<int>(IndentAtLineBreak, StartOfLineColumn[i]);
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}
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IndentAtLineBreak = std::max<unsigned>(IndentAtLineBreak, Decoration.size());
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DEBUG({
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llvm::dbgs() << "IndentAtLineBreak " << IndentAtLineBreak << "\n";
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for (size_t i = 0; i < Lines.size(); ++i) {
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llvm::dbgs() << i << " |" << Lines[i] << "| " << LeadingWhitespace[i]
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<< "\n";
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}
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});
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}
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void BreakableBlockComment::adjustWhitespace(unsigned LineIndex,
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int IndentDelta) {
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// When in a preprocessor directive, the trailing backslash in a block comment
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// is not needed, but can serve a purpose of uniformity with necessary escaped
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// newlines outside the comment. In this case we remove it here before
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// trimming the trailing whitespace. The backslash will be re-added later when
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// inserting a line break.
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size_t EndOfPreviousLine = Lines[LineIndex - 1].size();
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if (InPPDirective && Lines[LineIndex - 1].endswith("\\"))
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--EndOfPreviousLine;
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// Calculate the end of the non-whitespace text in the previous line.
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EndOfPreviousLine =
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Lines[LineIndex - 1].find_last_not_of(Blanks, EndOfPreviousLine);
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if (EndOfPreviousLine == StringRef::npos)
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EndOfPreviousLine = 0;
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else
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++EndOfPreviousLine;
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// Calculate the start of the non-whitespace text in the current line.
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size_t StartOfLine = Lines[LineIndex].find_first_not_of(Blanks);
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if (StartOfLine == StringRef::npos)
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StartOfLine = Lines[LineIndex].size();
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StringRef Whitespace = Lines[LineIndex].substr(0, StartOfLine);
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// Adjust Lines to only contain relevant text.
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Lines[LineIndex - 1] = Lines[LineIndex - 1].substr(0, EndOfPreviousLine);
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Lines[LineIndex] = Lines[LineIndex].substr(StartOfLine);
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// Adjust LeadingWhitespace to account all whitespace between the lines
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// to the current line.
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LeadingWhitespace[LineIndex] =
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Lines[LineIndex].begin() - Lines[LineIndex - 1].end();
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// Adjust the start column uniformly accross all lines.
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StartOfLineColumn[LineIndex] = std::max<int>(
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0,
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encoding::columnWidthWithTabs(Whitespace, 0, Style.TabWidth, Encoding) +
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IndentDelta);
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}
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unsigned BreakableBlockComment::getLineCount() const { return Lines.size(); }
|
||
|
|
|
||
|
|
unsigned BreakableBlockComment::getLineLengthAfterSplit(
|
||
|
|
unsigned LineIndex, unsigned Offset, StringRef::size_type Length) const {
|
||
|
|
unsigned ContentStartColumn = getContentStartColumn(LineIndex, Offset);
|
||
|
|
return ContentStartColumn +
|
||
|
|
encoding::columnWidthWithTabs(Lines[LineIndex].substr(Offset, Length),
|
||
|
|
ContentStartColumn, Style.TabWidth,
|
||
|
|
Encoding) +
|
||
|
|
// The last line gets a "*/" postfix.
|
||
|
|
(LineIndex + 1 == Lines.size() ? 2 : 0);
|
||
|
|
}
|
||
|
|
|
||
|
|
BreakableToken::Split
|
||
|
|
BreakableBlockComment::getSplit(unsigned LineIndex, unsigned TailOffset,
|
||
|
|
unsigned ColumnLimit) const {
|
||
|
|
return getCommentSplit(Lines[LineIndex].substr(TailOffset),
|
||
|
|
getContentStartColumn(LineIndex, TailOffset),
|
||
|
|
ColumnLimit, Style.TabWidth, Encoding);
|
||
|
|
}
|
||
|
|
|
||
|
|
void BreakableBlockComment::insertBreak(unsigned LineIndex, unsigned TailOffset,
|
||
|
|
Split Split,
|
||
|
|
WhitespaceManager &Whitespaces) {
|
||
|
|
StringRef Text = Lines[LineIndex].substr(TailOffset);
|
||
|
|
StringRef Prefix = Decoration;
|
||
|
|
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 = "";
|
||
|
|
}
|
||
|
|
|
||
|
|
unsigned BreakOffsetInToken =
|
||
|
|
Text.data() - Tok.TokenText.data() + Split.first;
|
||
|
|
unsigned CharsToRemove = Split.second;
|
||
|
|
assert(IndentAtLineBreak >= Decoration.size());
|
||
|
|
Whitespaces.replaceWhitespaceInToken(
|
||
|
|
Tok, BreakOffsetInToken, CharsToRemove, "", Prefix, InPPDirective, 1,
|
||
|
|
IndentLevel, IndentAtLineBreak - Decoration.size());
|
||
|
|
}
|
||
|
|
|
||
|
|
void BreakableBlockComment::replaceWhitespace(unsigned LineIndex,
|
||
|
|
unsigned TailOffset, Split Split,
|
||
|
|
WhitespaceManager &Whitespaces) {
|
||
|
|
StringRef Text = Lines[LineIndex].substr(TailOffset);
|
||
|
|
unsigned BreakOffsetInToken =
|
||
|
|
Text.data() - Tok.TokenText.data() + Split.first;
|
||
|
|
unsigned CharsToRemove = Split.second;
|
||
|
|
Whitespaces.replaceWhitespaceInToken(
|
||
|
|
Tok, BreakOffsetInToken, CharsToRemove, "", "", /*InPPDirective=*/false,
|
||
|
|
/*Newlines=*/0, /*IndentLevel=*/0, /*Spaces=*/1);
|
||
|
|
}
|
||
|
|
|
||
|
|
void
|
||
|
|
BreakableBlockComment::replaceWhitespaceBefore(unsigned LineIndex,
|
||
|
|
WhitespaceManager &Whitespaces) {
|
||
|
|
if (LineIndex == 0)
|
||
|
|
return;
|
||
|
|
StringRef Prefix = Decoration;
|
||
|
|
if (Lines[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 (StartOfLineColumn[LineIndex] == 1) {
|
||
|
|
// This line starts immediately after the decorating *.
|
||
|
|
Prefix = Prefix.substr(0, 1);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
unsigned WhitespaceOffsetInToken = Lines[LineIndex].data() -
|
||
|
|
Tok.TokenText.data() -
|
||
|
|
LeadingWhitespace[LineIndex];
|
||
|
|
assert(StartOfLineColumn[LineIndex] >= Prefix.size());
|
||
|
|
Whitespaces.replaceWhitespaceInToken(
|
||
|
|
Tok, WhitespaceOffsetInToken, LeadingWhitespace[LineIndex], "", Prefix,
|
||
|
|
InPPDirective, 1, IndentLevel,
|
||
|
|
StartOfLineColumn[LineIndex] - Prefix.size());
|
||
|
|
}
|
||
|
|
|
||
|
|
unsigned
|
||
|
|
BreakableBlockComment::getContentStartColumn(unsigned LineIndex,
|
||
|
|
unsigned TailOffset) const {
|
||
|
|
// If we break, we always break at the predefined indent.
|
||
|
|
if (TailOffset != 0)
|
||
|
|
return IndentAtLineBreak;
|
||
|
|
return StartOfLineColumn[LineIndex];
|
||
|
|
}
|
||
|
|
|
||
|
|
} // namespace format
|
||
|
|
} // namespace clang
|