================
@@ -0,0 +1,368 @@
+//===--- NumericLiteralCaseFixer.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 NumericLiteralCaseFixer that standardizes character
+/// case within numeric literal constants.
+///
+//===----------------------------------------------------------------------===//
+
+#include "NumericLiteralCaseFixer.h"
+
+#include "llvm/ADT/StringExtras.h"
+
+#include <algorithm>
+
+namespace clang {
+namespace format {
+
+using CharTransformFn = char (*)(char C);
+namespace {
+
+/// @brief Collection of std::transform predicates for each part of a numeric
+/// literal
+struct FormatParameters {
+ FormatParameters(FormatStyle::LanguageKind Language,
+ const FormatStyle::NumericLiteralCaseStyle &CaseStyle);
+
+ CharTransformFn Prefix;
+ CharTransformFn HexDigit;
+ CharTransformFn FloatExponentSeparator;
+ CharTransformFn Suffix;
+
+ char Separator;
+};
+
+/// @brief Parse a single numeric constant from text into ranges that are
+/// appropriate for applying NumericLiteralCaseStyle rules.
+class QuickNumericalConstantParser {
+public:
+ QuickNumericalConstantParser(const StringRef &IntegerLiteral,
+ const FormatParameters &Transforms);
+
+ /// @brief Reformats the numeric constant if needed.
+ /// Calling this method invalidates the object's state.
+ /// @return std::nullopt if no reformatting is required. std::option<>
+ /// containing the reformatted string otherwise.
+ std::optional<std::string> formatIfNeeded() &&;
+
+private:
+ const StringRef &IntegerLiteral;
+ const FormatParameters &Transforms;
+
+ std::string Formatted;
+
+ std::string::iterator PrefixBegin;
+ std::string::iterator PrefixEnd;
+ std::string::iterator HexDigitBegin;
+ std::string::iterator HexDigitEnd;
+ std::string::iterator FloatExponentSeparatorBegin;
+ std::string::iterator FloatExponentSeparatorEnd;
+ std::string::iterator SuffixBegin;
+ std::string::iterator SuffixEnd;
+
+ void parse();
+ void applyFormatting();
+};
+
+} // namespace
+
+static char noOpTransform(char C) { return C; }
+
+static CharTransformFn getTransform(int8_t config_value) {
+ switch (config_value) {
+ case -1:
+ return llvm::toLower;
+ case 1:
+ return llvm::toUpper;
+ default:
+ return noOpTransform;
+ }
+}
+
+/// @brief Test if Suffix matches a C++ literal reserved by the library.
+/// Matches against all suffixes reserved in the C++23 standard
+static bool matchesReservedSuffix(StringRef Suffix) {
+ static const std::set<StringRef> ReservedSuffixes = {
+ "h", "min", "s", "ms", "us", "ns", "il", "i", "if", "d", "y",
+ };
+
+ return ReservedSuffixes.find(Suffix) != ReservedSuffixes.end();
+}
+
+FormatParameters::FormatParameters(
+ FormatStyle::LanguageKind Language,
+ const FormatStyle::NumericLiteralCaseStyle &CaseStyle)
+ : Prefix(getTransform(CaseStyle.PrefixCase)),
+ HexDigit(getTransform(CaseStyle.HexDigitCase)),
+ FloatExponentSeparator(
+ getTransform(CaseStyle.FloatExponentSeparatorCase)),
+ Suffix(getTransform(CaseStyle.SuffixCase)) {
+ switch (Language) {
+ case FormatStyle::LK_CSharp:
+ case FormatStyle::LK_Java:
+ case FormatStyle::LK_JavaScript:
+ Separator = '_';
+ break;
+ case FormatStyle::LK_C:
+ case FormatStyle::LK_Cpp:
+ case FormatStyle::LK_ObjC:
+ default:
+ Separator = '\'';
+ }
+}
+
+QuickNumericalConstantParser::QuickNumericalConstantParser(
+ const StringRef &IntegerLiteral, const FormatParameters &Transforms)
+ : IntegerLiteral(IntegerLiteral), Transforms(Transforms),
+ Formatted(IntegerLiteral), PrefixBegin(Formatted.begin()),
+ PrefixEnd(Formatted.begin()), HexDigitBegin(Formatted.begin()),
+ HexDigitEnd(Formatted.begin()),
+ FloatExponentSeparatorBegin(Formatted.begin()),
+ FloatExponentSeparatorEnd(Formatted.begin()),
+ SuffixBegin(Formatted.begin()), SuffixEnd(Formatted.begin()) {}
+
+void QuickNumericalConstantParser::parse() {
+ auto Cur = Formatted.begin();
+ auto End = Formatted.cend();
+
+ bool IsHex = false;
+ bool IsFloat = false;
+
+ // Find the range that contains the prefix.
+ PrefixBegin = Cur;
+ if (*Cur != '0') {
+ } else {
----------------
HazardyKnusperkeks wrote:
```suggestion
if (*Cur == '0') {
```
https://github.com/llvm/llvm-project/pull/151590
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