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//===--- IntegerLiteralSeparatorFixer.cpp -----------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
///
/// \file
/// This file implements IntegerLiteralSeparatorFixer that fixes C++ integer
/// literal separators.
///
//===----------------------------------------------------------------------===//
#include "IntegerLiteralSeparatorFixer.h"
namespace clang {
namespace format {
enum class Base { Binary, Decimal, Hex, Other };
static Base getBase(StringRef IntegerLiteral) {
assert(IntegerLiteral.size() > 1);
if (IntegerLiteral[0] > '0') {
assert(IntegerLiteral[0] <= '9');
return Base::Decimal;
}
assert(IntegerLiteral[0] == '0');
switch (IntegerLiteral[1]) {
case 'b':
case 'B':
return Base::Binary;
case 'x':
case 'X':
return Base::Hex;
default:
return Base::Other;
}
}
std::pair<tooling::Replacements, unsigned>
IntegerLiteralSeparatorFixer::process(const Environment &Env,
const FormatStyle &Style) {
switch (Style.Language) {
case FormatStyle::LK_Cpp:
case FormatStyle::LK_ObjC:
Separator = '\'';
break;
case FormatStyle::LK_CSharp:
case FormatStyle::LK_Java:
case FormatStyle::LK_JavaScript:
Separator = '_';
break;
default:
return {};
}
const auto &Option = Style.IntegerLiteralSeparator;
const auto Binary = Option.Binary;
const auto Decimal = Option.Decimal;
const auto Hex = Option.Hex;
const bool SkipBinary = Binary == 0;
const bool SkipDecimal = Decimal == 0;
const bool SkipHex = Hex == 0;
if (SkipBinary && SkipDecimal && SkipHex)
return {};
const auto BinaryMinDigits =
std::max((int)Option.BinaryMinDigits, Binary + 1);
const auto DecimalMinDigits =
std::max((int)Option.DecimalMinDigits, Decimal + 1);
const auto HexMinDigits = std::max((int)Option.HexMinDigits, Hex + 1);
const auto &SourceMgr = Env.getSourceManager();
AffectedRangeManager AffectedRangeMgr(SourceMgr, Env.getCharRanges());
const auto ID = Env.getFileID();
const auto LangOpts = getFormattingLangOpts(Style);
Lexer Lex(ID, SourceMgr.getBufferOrFake(ID), SourceMgr, LangOpts);
Lex.SetCommentRetentionState(true);
Token Tok;
tooling::Replacements Result;
for (bool Skip = false; !Lex.LexFromRawLexer(Tok);) {
auto Length = Tok.getLength();
if (Length < 2)
continue;
auto Location = Tok.getLocation();
auto Text = StringRef(SourceMgr.getCharacterData(Location), Length);
if (Tok.is(tok::comment)) {
if (isClangFormatOff(Text))
Skip = true;
else if (isClangFormatOn(Text))
Skip = false;
continue;
}
if (Skip || Tok.isNot(tok::numeric_constant) || Text[0] == '.' ||
!AffectedRangeMgr.affectsCharSourceRange(
CharSourceRange::getCharRange(Location, Tok.getEndLoc()))) {
continue;
}
const auto B = getBase(Text);
const bool IsBase2 = B == Base::Binary;
const bool IsBase10 = B == Base::Decimal;
const bool IsBase16 = B == Base::Hex;
if ((IsBase2 && SkipBinary) || (IsBase10 && SkipDecimal) ||
(IsBase16 && SkipHex) || B == Base::Other) {
continue;
}
if (Style.isCpp()) {
// Hex alpha digits a-f/A-F must be at the end of the string literal.
StringRef Suffixes = "_himnsuyd";
if (const auto Pos =
Text.find_first_of(IsBase16 ? Suffixes.drop_back() : Suffixes);
Pos != StringRef::npos) {
Text = Text.substr(0, Pos);
Length = Pos;
}
}
if ((IsBase10 && Text.find_last_of(".eEfFdDmM") != StringRef::npos) ||
(IsBase16 && Text.find_last_of(".pP") != StringRef::npos)) {
continue;
}
const auto Start = Text[0] == '0' ? 2 : 0;
auto End = Text.find_first_of("uUlLzZn", Start);
if (End == StringRef::npos)
End = Length;
if (Start > 0 || End < Length) {
Length = End - Start;
Text = Text.substr(Start, Length);
}
auto DigitsPerGroup = Decimal;
auto MinDigits = DecimalMinDigits;
if (IsBase2) {
DigitsPerGroup = Binary;
MinDigits = BinaryMinDigits;
} else if (IsBase16) {
DigitsPerGroup = Hex;
MinDigits = HexMinDigits;
}
const auto SeparatorCount = Text.count(Separator);
const int DigitCount = Length - SeparatorCount;
const bool RemoveSeparator = DigitsPerGroup < 0 || DigitCount < MinDigits;
if (RemoveSeparator && SeparatorCount == 0)
continue;
if (!RemoveSeparator && SeparatorCount > 0 &&
checkSeparator(Text, DigitsPerGroup)) {
continue;
}
const auto &Formatted =
format(Text, DigitsPerGroup, DigitCount, RemoveSeparator);
assert(Formatted != Text);
if (Start > 0)
Location = Location.getLocWithOffset(Start);
cantFail(Result.add(
tooling::Replacement(SourceMgr, Location, Length, Formatted)));
}
return {Result, 0};
}
bool IntegerLiteralSeparatorFixer::checkSeparator(StringRef IntegerLiteral,
int DigitsPerGroup) const {
assert(DigitsPerGroup > 0);
int I = 0;
for (auto C : llvm::reverse(IntegerLiteral)) {
if (C == Separator) {
if (I < DigitsPerGroup)
return false;
I = 0;
} else {
if (I == DigitsPerGroup)
return false;
++I;
}
}
return true;
}
std::string IntegerLiteralSeparatorFixer::format(StringRef IntegerLiteral,
int DigitsPerGroup,
int DigitCount,
bool RemoveSeparator) const {
assert(DigitsPerGroup != 0);
std::string Formatted;
if (RemoveSeparator) {
for (auto C : IntegerLiteral)
if (C != Separator)
Formatted.push_back(C);
return Formatted;
}
int Remainder = DigitCount % DigitsPerGroup;
int I = 0;
for (auto C : IntegerLiteral) {
if (C == Separator)
continue;
if (I == (Remainder > 0 ? Remainder : DigitsPerGroup)) {
Formatted.push_back(Separator);
I = 0;
Remainder = 0;
}
Formatted.push_back(C);
++I;
}
return Formatted;
}
} // namespace format
} // namespace clang
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